WO2019073467A1

WO2019073467A1 - A chair

Info

Publication number: WO2019073467A1
Application number: PCT/IE2018/000014
Authority: WO
Inventors: Damien Gerard MASON; James Robert Lynch; Mathew Gill BATES; Brian Joseph GARVEY; Simon Fredriksson
Original assignee: Flexibod Limited
Priority date: 2017-10-13
Filing date: 2018-10-15
Publication date: 2019-04-18

Abstract

A chair (1) for carrying out leg stretching exercises by a subject seated thereon comprises a seat (9) formed by a main seat element (17) and a pair of thigh support elements (35) extending from the main seat element (17). The thigh support elements (35) are pivotal in a generally downwardly direction about respective horizontal first pivot axes (37) from a first state for supporting the corresponding thigh of a subject to a second downwardly extending state with the thigh of the subject unsupported. The thigh support elements (35) are also pivotal about respective substantially vertically extending main pivot axes (45) in a generally rearwardly direction away from each other from a normal forwardly extending state to a stretching state for urging the thighs of a subject supported on the thigh support elements (35) away from each other for stretching the adductor muscles. A pair of foot support elements (13) extend transversely and sidewardly on respective opposite sides of the chair (1) from a carrier element (16) for engaging the instep of a corresponding foot of a subject for supporting the foot during a stretching exercise of the quadriceps and hip flexor muscles with the corresponding thigh of the subject extending generally downwardly from the seat (9) and the lower leg extending from the knee in a generally rearwardly upwardly inclined direction to the foot support element (13).

Description

"A chair"

The present invention relates to a chair, and in particular, though not limited to a chair for facilitating carrying out stretching exercises by a subject seated on the chair for stretching leg muscles and related muscles as well as other stretches and exercises.

Chairs for stretching muscles of a subject, in particular, leg and related muscles are known. Such chairs tend to be relatively large and particularly cumbersome, and in general, are suitable only for carrying out stretching exercises. They are not suitable as for example, an office chair or the like. Examples of such chairs are disclosed in U.S. Patent Specification No. 5,626,547 of Davies et al., and while such exercise chairs are suitable for carrying out stretching exercises on leg and other associated muscles of a subject, they are suitable for no other purpose other than for carrying out such stretching exercises due to their relatively large and cumbersome construction. There is therefore a need for a chair which addresses at least some of the problems of such known chairs.

The present invention is directed towards providing such a chair.

According to the invention there is provided a chair comprising a ground engaging support, a seat supported on the ground engaging support for supporting a subject seated thereon, at least one foot support means located on at least one side of the chair, and configured for supporting a corresponding foot or lower leg of a subject seated on the seat with the corresponding thigh of the subject extending generally downwardly towards the knee from the seat, and the corresponding lower leg of the subject extending in a generally rearwardly direction towards the foot support means for stretching the quadriceps and hip flexor muscles, the seat comprising a main seat element configured for supporting the buttocks of a seated subject, and at least one thigh support element operable in a first state for supporting at least one of the thighs of a subject seated on the seat, and a second state substantially clear of the said thigh permitting the subject to extend the thigh generally downwardly from the main seat element. In one aspect of the invention the main seat element comprises a rearward part for supporting the buttocks of the subject seated thereon, the rearward part of the main seat element extending between a rearward edge and a forward edge. Preferably, the thigh support element extends forwardly from the rearward part of the main seat element.

Preferably, the thigh support element is located relative to the main seat element extending in a direction generally forwardly from the forward edge of the rearward part thereof.

In one aspect of the invention the rearward part of the main seat element defines a central longitudinal seat axis extending in a generally forward, rearward direction relative to the front and back of the chair, the central longitudinal seat axis substantially bisecting the rearward part of the seat. In another aspect of the invention the main seat element comprises a forward part extending forwardly from the rearward part of the main seat element, and preferably, extending centrally from the rearward part of the main seat element and defining with the rearward part of the central longitudinal seat axis. Advantageously, the central longitudinal seat axis bisects the forward part of the main seat element. Preferably, the forward part of the main seat element defines a pair of spaced apart side edges extending along the forward part on opposite sides of the central longitudinal seat axis, the side edges of the forward part of the seat element extending relative to the central longitudinal seat axis one of parallel to the central longitudinal seat axis and diverging rearwardly from the central longitudinal seat axis, and preferably, the respective side edges of the forward part of the main seat element extend at an angle relative to the central longitudinal seat axis not greater than 20°, and preferably, not greater than 15° and

advantageously, not greater than 10°, and advantageously, not greater than 6°, and preferably, not greater than 2°, and advantageously, not greater than 1 °. Ideally, the respective side edges of the forward part of the main seat element extend at an angle of approximately 5.8° relative to the central longitudinal seat axis.

In another aspect of the invention the thigh support element extends sidewardly from the corresponding side edge of the forward part of the seat.

In one aspect of the invention the rearward part of the main seat element defines a central transverse seat axis extending transversely of the seat relative to the front and back of the chair, and preferably, substantially perpendicularly to the central longitudinal axis.

In one aspect of the invention the forward edge of the rearward part of the main seat element extends relative to the central transverse seat axis one of parallel to the central transverse seat axis and diverging from the central transverse seat axis in a general direction towards the central longitudinal seat axis.

In one aspect of the invention the forward edge of the rearward part of the main seat element diverges from the central transverse seat axis in the general direction towards the central longitudinal seat axis at an angle in the range of 0° to 10°, and preferably, at an angle of approximately 4°

In another aspect of the invention the thigh support element is urgeable from the first state to the second state about a corresponding first pivot axis.

Preferably, the first pivot axis extends parallel to one of the central seat axis, and the adjacent side edge defined by the forward part of the main seat element.

In another aspect of the invention the first pivot axis extends adjacent the corresponding side edge of the forward part of the main seat element.

In another aspect of the invention the first pivot axis extends parallel to one of the central transverse seat axis and the adjacent forward edge of the rearward part of the main seat element. Preferably, the first pivot axis extends adjacent the corresponding forward edge of the rearward part of the main seat element.

In a further aspect of the invention the thigh support element is pivotal downwardly about the first pivot axis from the first state to the second state.

Preferably, the thigh support element extends substantially horizontally in the first state.

Preferably, the first pivot axis extends substantially horizontally. In another aspect of the invention a pair of thigh support elements are provided for supporting the respective thighs of a subject, and preferably, the thigh support elements are pivotal about respective first pivot axes between the first and second states. Ideally, the thigh support elements are pivotal about the first pivot axes independently of each other.

In one aspect of the invention the first thigh support is slideable from the first state to the second state. In a further aspect of the invention each thigh support element is releasably located in the chair in the first state, and is removable from the chair.

Preferably, each thigh support element is releasably engageable in the chair in the first state in a first receiving means.

Advantageously, a second receiving means is provided in the chair for receiving each thigh support element when the thigh support element is in the second state.

In one aspect of the invention a single thigh support element is provided, and preferably, the single thigh support element the single thigh support element is moveable from the first state to a third state for supporting both thighs of a seated subject simultaneously. Advantageously, the single thigh support element is moveable from the second to the third state. Preferably, the single thigh support element is moveable from the first state to a fourth state with neither of the thighs of a seated subject supported. In one aspect of the invention the single thigh support element is slideable between the respective states.

In another aspect of the invention the single thigh support element is pivotal about the first pivot axis.

In a further aspect of the invention the first pivot axis about which the single thigh support element is pivotal between the respective state extends substantially generally vertically.

Preferably, the vertically extending first pivot axis is located to cut the central longitudinal seat axis.

In another aspect of the invention the single thigh support element is moveable from the first state at a location to one side of the central longitudinal seat axis for supporting one of the thighs, to the second state at a location to the other side of the central longitudinal seat axis for supporting the other one of the thighs. In one aspect of the invention the single thigh support element comprises an arcuate element.

Alternately, the single thigh support element comprises a rectangular element.

Preferably, the single thigh support element is urgeable beneath the main seat element.

In another aspect of the invention the single thigh support element is provided supporting the respective thighs of a subject thereon. In one aspect of the invention the single thigh support is moveable from a first state supporting one or both of the thighs of the seated subject, to a second state with the other one of the thighs of the subject or none of the thighs of the subject supported. Preferably, the thigh support element is pivotal about the first pivot axis extending adjacent the forward edge of the rearward part of the main seat element, and in an alternative aspect of the invention the single thigh support element is pivotal about the first pivot axis extending substantially parallel to the central longitudinal seat axis.

In a further aspect of the invention the single thigh support element is configured for supporting the two thighs of a seated subject simultaneously when the thigh support element is in the first state, and preferably, the single thigh support element is operable in two second states selectively supporting alternate ones of the thighs in the respective second states.

In one aspect of the invention the single thigh support element comprises an L-shaped member, in a further aspect of the invention the single thigh support element comprises an arcuate element, and in a further aspect of the invention the single thigh support element comprises a rectangular element.

Ideally, the single thigh support element is urgeable in the second states beneath the main seat element. In another aspect of the invention the single thigh support element is slideable relative to the main seat element between the first and second states, and preferably, is slideable beneath the main seat element into each of the second states.

In one aspect of the invention each thigh support element is slideable relative to the main seat element between the first state and the second state.

In another aspect of the invention each thigh support element is slideable beneath the main seat element in one or both of the first and second states. In a further aspect of the invention the seat comprises a pair of seat elements pivotally connected along the central longitudinal seat axis defined by the main seat element.

Preferably, the respective seat elements are pivotal about one or a pair of respective first pivot axes extending parallel to the central longitudinal seat axis, and preferably, each first pivot axis coincides with the central longitudinal seat axis.

In one aspect of the invention each seat element is pivotal from a first state supporting the corresponding one of the buttocks and the corresponding one of the thighs of the seated subject, to a second state clear of the corresponding buttock and the thigh of the subject for facilitating stretching of the quadriceps and hip flexor muscles.

In one aspect of the invention each thigh support element is hingedly coupled by a first hinge about the first pivot axis, the first hinge defining the first pivot axis and comprising first and second hinge members which are pivotally coupled by a pivot shaft fixedly extending from one of the first and second hinge members to the other one of the first and second hinge members and on which the said other one of the first and second hinge members is.rotatably mounted.

In another aspect of the invention the first and second hinge members of each first hinge terminate in respective co-operating abutment faces, the abutment faces being configured for selectively retaining the first and second hinge members in respective first and second states corresponding to the first and second states of the corresponding thigh support element, and in turn for selectively retaining the corresponding thigh support element in a selected one of the first and second states. In another aspect of the invention the abutment faces of the respective first and second hinge members of each first hinge are configured for selectively retaining the first and second hinge members in one or more selectable intermediate positions intermediate the first and second states for in turn retaining the corresponding thigh support element in selectable one or more intermediate positions between the respective first and second states of the corresponding thigh support element.

In one aspect of the invention the first and second hinge members of each first hinge are resiliently urged apart for disengaging the respective abutment faces from each other for permitting pivotal movement of one of the first and second hinge members relative to the other, for in turn permitting pivoting of the corresponding thigh support element about the corresponding first pivot axis, and preferably, a retaining means is provided for retaining the first and second hinge members of each first hinge together with the abutment faces thereof abutting each other for retaining the hinge and in turn the corresponding thigh support elements in a selected one of the first and second states or a selected one of the one or more intermediate positions intermediate the first and second states. Advantageously, the retaining means comprises a latch, and ideally, the retaining means comprises a toggle latch.

Alternatively, the first and second hinge members of each first hinge are resiliently urged into engagement with each other for retaining the corresponding abutment faces in abutting engagement with each other, and an urging means is provided for urging one of the first and second hinge members of each first hinge from the other one thereof, and in turn for urging the abutment faces apart to permit pivoting of the first and second hinge members relative to each other, and in turn to permit pivoting of the corresponding thigh support element about the corresponding first pivot axis. Preferably, the urging means comprises a latch, and advantageously, the urging means comprises a toggle latch.

In another aspect of the invention each thigh support element comprises an inner thigh engagement means operable between a first state engaging an inner portion of a corresponding one of the thighs of a seated subject, and a second state disengaged from the inner portion of the corresponding thigh of the seated subject.

Preferably, each inner thigh engagement means is located adjacent the distal end of the corresponding thigh support element, and advantageously, each inner thigh engagement means is pivotally coupled to the corresponding thigh support element about a second pivot axis between the first and second states thereof. Preferably, the second pivot axis is located adjacent an inner side portion of the corresponding thigh support element, and preferably, adjacent an inner side edge of the corresponding thigh support element.

Preferably, the second pivot axis extends parallel to the first pivot axis. Preferably, each inner thigh engagement means is pivotally coupled to the corresponding thigh support element by a second hinge defining the corresponding second pivot axis, and preferably, by a friction second hinge, and preferably the second hinge is configured for releasably retaining the inner thigh engagement means selectively in the second state thereof. Alternately, the inner thigh engagement means is slideable between the first and second states thereof, and advantageously, is slideable between the first and second states thereof in a slot formed in the corresponding thigh support element. In another aspect of the invention each thigh support element is urgeable generally rearwardly about a substantially vertically extending main pivot axis from a normal state extending generally forwardly from the main seat element supporting the corresponding thigh of a seated subject extending substantially parallel to the central longitudinal seat axis, to a stretching state with the thigh of the subject extending at an angle greater than 0° from the central longitudinal seat axis and diverging therefrom for stretching the adductor muscles of the seated subject.

In another aspect of the invention each thigh support element is urgeable about the corresponding main pivot axis from the normal state into a plurality of stretching states. In one aspect of the invention each thigh support element is urgeable about the corresponding main pivot axis from the normal state to the stretching state through an angle of at least 30°, and preferably, through an angle of at least 45°, and advantageously through an angle of at least 60°, and preferably, through an angle of approximately 90°. Advantageously, the respective thigh support elements are simultaneously pivotal about the respective main pivot axes from the normal state to the stretching state.

In one aspect of the invention the thigh support elements are incrementally urgeable about the respective main pivot axes through incremental angles from the normal state to the stretching state.

Preferably, the thigh support elements are manually urgeable about the respective main pivot axes from the normal state to the stretching state, and preferably, are urgeable by a manually operated drive means. In one aspect of the invention the manually operated drive means comprises a manually operated hydraulic ram.

Advantageously, the manually operated drive means comprises a quick release mechanism for facilitating manual return of the thigh support elements about the respective main pivot axes from the stretching state to the normal state.

In one aspect of the invention the seat comprises a pair of buttock supporting elements for supporting the respective buttocks of a subject seated thereon. Preferably, each buttock supporting element of the seat is urgeable with the corresponding thigh support element as the thigh support element is being urged between the normal state and the stretching state. Advantageously, each buttock supporting element is pivotal with the corresponding thigh support element about the corresponding main pivot axis as the thigh support element is being urged between the normal and stretching states. Preferably, each buttock supporting seat element of the pair thereof is provided with an inner thigh engagement element. In another aspect of the invention each inner thigh engagement element is rigidly secured to the corresponding buttock supporting element of the pair thereof.

In one aspect of the invention each thigh support element is urgeable about the first pivot axis from the first state to a third state extending generally upwardly from the first axis thereof.

In another aspect of the invention the seat comprises a single seat element urgeable from a first state supporting the buttocks and the right thigh of a seated subject with the left thigh unsupported, and a second state supporting the buttocks and the left thigh of the seated subject with the right thigh unsupported. Preferably, the single seat element is pivotal between the first and second states about a first pivot axis. Advantageously, the first pivot axis extends substantially vertically. Preferably, the single seat element is of L-shape construction when viewed in plan. Advantageously, the first pivot axis extends through the single seat element adjacent the junction of the respective inner edges of the shaped single seat element. In one aspect of the invention the at least one foot support means is carried on a carrier element, and in another aspect of the invention the carrier element of the foot support means is carried on an upstanding member extending upwardly to the rear of the seat, and preferably, extending above the seat, and preferably, extending above and below the seat. Advantageously, the carrier element is slideable upwardly and downwardly along the upstanding support member for adjusting the height of the foot support means relative to the seat.

In another aspect of the invention the carrier element is pivotally mounted for facilitating backward and forward pivoting of the foot support means relative to the seat. Preferably, a releasable locking means is provided for releasably locking the carrier element in a desired angular position with the foot support means in a desired position relative to the forward/rearward direction of the pivotal movement of the carrier element. In an alternative aspect of the invention the carrier element extends from the ground engaging support, and preferably, is adjustably coupled to the ground engaging support for facilitating varying the height of the foot support means relative to the height of the seat.

Preferably, a pair of foot support means are provided extending sidewardly outwardly on respective opposite sides of the chair.

Additionally, the invention provides a chair comprising at least one thigh support element for supporting at least one of the thighs of a subject seated on the chair, the thigh support element being operable in a generally rearwardly direction from a normal state extending generally forwardly of the chair for stretching the adductor muscles.

Preferably, a pair of thigh support elements are provided for supporting the respective thighs of a seated subject. In one aspect of the invention the chair comprises a seat, and preferably, the seat comprises a main seat element configured for supporting the buttocks of a seated subject. Preferably, the main seat element comprises a rearward part for supporting the buttocks of the subject seated thereon, the rearward part of the main seat element extending between a rearward edge and a forward edge. Preferably, each thigh support element in the normal state is located relative to the main seat element extending in a direction generally forwardly from the forward edge of the rearward part thereof.

In one aspect of the invention the rearward part of the main seat element defines a central longitudinal seat axis extending in a generally forward, rearward direction relative to the front and back of the chair, the central longitudinal seat axis substantially bisecting the rearward part of the seat.

In one aspect of the invention the rearward part of the main seat element defines a central transverse seat axis extending transversely of the seat relative to the front and back of the chair, and preferably, substantially perpendicularly to the central longitudinal seat axis.

Preferably, the the forward edge of the rearward part of the main seat element diverges from the central transverse seat axis in a direction towards the central longitudinal seat axis at an angle in the range of 0° to 10°, and preferably, the forward edge of the rearward part of the main seat element diverges from the central transverse seat axis in a direction towards the central longitudinal seat axis at an angle of approximately 4°.

Preferably, each thigh support element extends forwardly from the rearward part of the main seat element. In another aspect of the invention the main seat element comprises a forward part extending forwardly from the rearward part of the main seat element, and preferably extending centrally from the rearward part of the main seat element, and advantageously, defining with the rearward part the central longitudinal seat axis. Preferably, the forward part of the main seat element defines a pair of spaced apart side edges extending on opposite sides of the central longitudinal seat axis. Preferably, the side edges of the forward part of the seat element extend relative to the central longitudinal seat axis one of parallel to the central longitudinal seat axis and diverging rearwardly from the central longitudinal seat axis, and preferably, the respective side edges of the forward part of the main seat element diverge rearwardly relative to the central longitudinal seat axis at an angle not greater than 20°, and preferably, not greater than 15° and advantageously, not greater than 10°, and advantageously, not greater than 6°, and preferably, not greater than 2°, and advantageously, not greater than 1 °. Ideally, the respective side edges of the forward part of the main seat element diverge rearwardly relative to the central longitudinal seat axis at an angle of approximately 5.8° to the central longitudinal seat axis.

In another aspect of the invention each thigh support element extends sidewardly from the corresponding side edge of the forward part of the main seat element. Preferably, each thigh support element is urgeable in the generally rearwardly direction from the normal state about a substantially vertically extending main pivot axis, and advantageously, each thigh support element is urgeable in the general rearwardly direction from the normal state to a stretching state with the thigh support element extending at an angle greater than zero from the central longitudinal seat axis and diverging therefrom.

In one aspect of the invention each thigh support element is urgeable in the generally rearwardly direction from the normal state about the main pivot axis into a plurality of stretching states. In another aspect of the invention each thigh support element is pivotal about the main pivot axis from the normal state to the stretching state through an angle of at least 30°, and preferably, through an angle of at least 45°, and advantageously through an angle of at least 60°, and preferably, through an angle of approximately 90°. Advantageously, the respective thigh support elements are simultaneously pivotal about the respective main pivot axes from the normal state to the stretching state.

Preferably, the thigh support elements are urgeable simultaneously from the normal state in the generally rearwardly direction away from each other to the stretching state.

In one aspect of the invention each thigh support element is incrementally urgeable about the corresponding main pivot axis from the normal state to the stretching state through a plurality of incremental angular positions.

In one aspect of the invention each thigh support element is manually urgeable about the corresponding main pivot axis from the normal state to the stretching state. Preferably, each thigh support element is urgeable about the corresponding main pivot axis from the normal state to the stretching state by a drive means. Advantageously, the drive means comprises an hydraulic ram.

In one aspect of the invention the drive means is configured for retaining the thigh support elements in the stretching state.

Preferably, the drive means comprises a quick release mechanism for facilitating manual return of the thigh support elements about the main pivot axis from the stretching state to the normal state. In one aspect of the invention each thigh support element is urgeable from a first state configured to support a corresponding thigh of a seated subject to a second state substantially clear of the corresponding thigh permitting a seated subject to extend the thigh generally downwardly from the main seat element.

In another aspect of the invention each thigh support element is urgeable from the first state to the second state clear of the thigh of the subject, and preferably, is urgeable downwardly from the first state to the second state, and advantageously, is urgeable about a corresponding first pivot axis from the first state to the second state.

Preferably, each first pivot axis extends parallel to one of the central seat axis, and the adjacent side edge defined by the forward part of the main seat element.

In another aspect of the invention each first pivot axis extends adjacent the corresponding side edge of the forward part of the main seat element.

In another aspect of the invention each first pivot axis extends parallel to one of the central transverse seat axis and the forward edge of the rearward part of the main seat element. Preferably, each first pivot axis extends adjacent the forward edge of the rearward part of the main seat element.

In a further aspect of the invention each thigh support element is pivotal downwardly about the corresponding first pivot axis from the first state to the second state.

In another aspect of the invention a pair of thigh support elements are provided for supporting the respective thighs of a subject, the thigh support elements being pivotal about respective first pivot axes between the first and second states. Ideally, the thigh support elements are pivotal about the first pivot axis independently of each other.

In one aspect of the invention each thigh support element is hingedly coupled by a first hinge about the first pivot axis, the first hinge defining the first pivot axis and comprising first and second hinge members which are pivotally coupled by a pivot shaft fixedly extending from one of the first and second hinge members to the other one of the first and second hinge members and on which the said other one of the first and second hinge members is rotatably mounted. In another aspect of the invention the first and second hinge members of each first hinge terminate in respective co-operating abutment faces, the abutment faces being configured for selectively retaining the first and second hinge members in respective first and second states corresponding to the first and second states of the corresponding thigh support element, and in turn for selectively retaining the corresponding thigh support element in a selected one of the first and second states.

In another aspect of the invention the abutment faces of the respective first and second hinge members of each first hinge are configured for selectively retaining the first and second hinge members in one or more selectable intermediate positions intermediate the first and second states for in turn retaining the corresponding thigh support element in selectable one or more intermediate positions between the respective first and second states of the corresponding thigh support element.

In one aspect of the invention the first and second hinge members of each first hinge are resiliently urged apart for disengaging the respective abutment faces from each other for permitting pivotal movement of one of the first and second hinge members relative to the other, for in turn permitting pivoting of the corresponding thigh support element about the corresponding first pivot axis, and preferably, a retaining means is provided for retaining the first and second hinge members of each first hinge together with the abutment faces thereof abutting each other for retaining the hinge and in turn the corresponding thigh support elements in a selected one of the first and second states or a selected one of the one or more intermediate positions intermediate the first and second states.

In one aspect of the invention the retaining means comprises a latch, and preferable, a toggle latch.

In another aspect of the invention each thigh support element is urgeable about the first pivot axis from the first state to a third state extending generally upwardly from the first axis thereof.

In another aspect of the invention the seat comprises a pair of buttock supporting elements for supporting the respective buttocks of a subject seated thereon. Preferably, each buttock supporting element of the seat is urgeable with the corresponding thigh support element as the thigh support element is being urged between the normal and stretching states. Advantageously, each buttock supporting element is pivotal with the corresponding thigh support element about the corresponding main pivot axis as the thigh support element is being urged between the normal state and the stretching state. In another aspect of the invention each buttock supporting element of the pair thereof is provided with an inner thigh engagement element.

Preferably, each inner thigh engagement element is rigidly secured to the corresponding buttock supporting element of the pair thereof.

In another aspect of the invention the thigh support elements extend from the respective buttock supporting elements.

In another aspect of the invention each thigh support element extends rigidly from the corresponding buttock supporting element.

Preferably, each inner thigh engagement means is located adjacent the distal end of the corresponding thigh support element, and advantageously, each inner thigh engagement means is pivotally coupled to the corresponding thigh support element about a second pivot axis. Preferably, the second pivot axis is located adjacent an inner side portion of the corresponding thigh support element.

In another aspect of the invention the inner thigh engagement means is pivotally coupled to the corresponding thigh support element, and preferably, is pivotally coupled to the corresponding thigh support element adjacent an inner side edge of the corresponding thigh support element.

Preferably, each second pivot axis extends substantially parallel to the corresponding first pivot axis. Preferably, each inner thigh engagement means is pivotally coupled to the corresponding thigh support element by a hinge, and preferably, by a friction hinge defining the second pivot axis, and preferably, the hinge is configured for retaining the inner thigh engagement means selectively in the first and second states. Alternately, each inner thigh engagement means is slideable between the first and second states thereof, and advantageously, is slideable in a slot formed in the corresponding thigh support element.

In one aspect of the invention, a ground engaging support is provided, and the seat is supported on the ground engaging support.

Additionally the invention provides a chair comprising a seat having a buttock supporting element and a single thigh support element.

In one aspect of the invention the single thigh support element is urgeable from a first state supporting a right thigh of a seated subject with the left thigh of the seated subject unsupported, and a second state supporting the left thigh of the seated subject and the right thigh thereof unsupported.

In another aspect of the invention the single thigh support element is configured for operating in a third state simultaneously supporting the respective thighs of the subject. Preferably, the single thigh support element is urgeable between the first state and the third state. Advantageously, the single thigh support element is urgeable between the second state and the third state.

In a further aspect of the invention the single thigh support element is urgeable into a fourth state with neither of the thighs of a seated subject supported. Preferably, the single thigh support element is urgeable between the first state and the fourth state. Advantageously, the single thigh support element is urgeable between the second state and the fourth state.

In one aspect of the invention the single thigh support element is pivotal about the first pivot axis between the respective states thereof.

In one aspect of the invention the first pivot axis extends substantially vertically. In an alternative aspect of the invention the single thigh support element is slideable between the respective states thereof.

In one aspect of the invention at least one foot support means is located on at least one side of the chair configured for supporting a corresponding foot or lower leg of a subject seated on the seat with the corresponding thigh of the subject extending generally downwardly towards the knee from the seat, and the corresponding lower leg of the subject extending in a generally rearwardly direction towards the foot support means for stretching the quadriceps and the hip flexor muscles. Preferably, a ground engaging support is provided and the seat is supported on the ground engaging support.

Further the invention provides a chair comprising a single seat element urgeable from a first state supporting the buttocks and the right thigh of a seated subject with the left thigh unsupported, and a second state supporting the buttocks and the left thigh of the seated subjected with the right thigh unsupported.

In one aspect of the invention the single seat element is of L-shape construction when viewed in plan, a first leg of the L-shape seat element supporting the buttocks of a seated subject and a second leg of the L-shape seat element supporting the right thigh of the seated subject when the seat element is in the first state, and the second leg of the seat element supporting the buttocks of the subject and the first leg of the seat element supporting the left thigh of the subject when the seat element is in the second state.

In another aspect of the invention the single seat element is pivotal between the first and second states about a first pivot axis.

In one aspect of the invention the first pivot axis extends substantially vertically. Preferably, the first pivot axis extends through the single seat element adjacent the junction of the respective inner edges of the shaped single seat element.

In one aspect of the invention a pair of single seat elements are provided, the single seat elements being configured to be operable with one of the single seat elements in the first state simultaneously while the other one of the single seat elements is in the second state. Preferably, the respective single seat elements are simultaneously operable in the first state. Advantageously, the respective single seat elements are simultaneously operable in the second state.

The invention also provides a chair comprising a pair of buttock supporting elements for supporting the respective buttocks of a seated subject, and a pair of thigh support elements extending from the respective buttock supporting elements, each buttock supporting element and the corresponding thigh support element being urgeable between a first state with the corresponding buttock and thigh supported by the buttock supporting element and the thigh support element, respectively, and a second state with the buttock supporting element and the thigh support element clear of the corresponding buttock and thigh with the corresponding buttock and thigh unsupported.

In one aspect of the invention each thigh support element extends rigidly forwardly from the corresponding buttock supporting element. In another aspect of the invention each buttock supporting element and the corresponding thigh support element are slideable between the first and second states.

In a further aspect of the invention each buttock supporting element and the corresponding thigh support element are pivotal about a first pivot axis between the first and second state.

In a further aspect of the invention the or each first pivot axis extends substantially horizontally.

In one aspect of the invention the first pivot axis extends in a generally forwardly rearwardly direction. In another aspect of the invention at least one foot support means is located on at least one side of the chair configured for supporting a corresponding foot or lower leg of a subject seated on the chair with the corresponding thigh of the subject extending generally downwardly towards the knee from the seat, and the corresponding lower leg of the subject extending in a generally rearwardly direction towards the foot support means for stretching the quadriceps and the hip flexor muscles.

Preferably, a ground engaging support is provided and the buttock supporting elements are supported on the ground engaging support. The advantages of the invention are many. A particularly important advantage of the invention is that the chair according to the invention which is suitable for carrying out stretching exercises of the leg and associated muscles, is also particularly suited as an office chair, or indeed, a chair for any other use, be it as a dining room chair, or any other such chair which as well as supporting a subject in a seated state, also allows a subject to carry out stretching exercises of leg and associated muscles.

Another advantage of the invention is that the chair allows a subject seated thereon to be seated in a neutral pelvis state, in other words, a state in which the pelvis does not tilt unnaturally when both thighs are extending forwardly from the seated subject. Additionally, the chair also allows a subject seated on the seat to be seated in a neutral pelvis state when one leg is extending forwardly, and the other is extending rearwardly. By having a subject seated in a neutral pelvis state on the chair significantly reduces stress in the spine, and in turn back pain. Additionally, by stretching the various leg and associated lower body muscles in the chair according to the invention, the length of the muscles can be maintained at their correct length rather than contracted lengths, which can occur when a subject is seated in an unsuitable position in a conventional chair for extended periods of time. It has been found that by spending a significant amount of time in a traditional 90° seated position, one's muscles may become unbalanced, where one muscle may be shorter than a desired length, for example, the hip flexor muscle may become shorter than it should be, while another muscle, for example, the glute, may become longer than it should be. This results in the muscles developing a new "normal" length, which may be best adapted to seating. The consequence of this is that the muscles do not fire or activate properly when one walks, runs or engages in other activities, and thus, a muscle like the glute may become weak and inactive overtime. This may result in structural overloads in the body, whereby the surrounding muscles, in this case, the hamstring and the lower back muscle are required to compensate for the perceived weakness of the glute. Accordingly, a significant advantage of the chair according to the invention is that the length of the respective muscles may be reset to the correct lengths, in other words, to their normal working lengths. The chair according to the invention allows activation and strengthening exercises to be carried out in the various stretching positions, so that not only are the thigh muscles being stretched, but the other weakened muscles may also be strengthened and activated. Accordingly, the chair according to the invention allows one while in a setting position to stretch, exercise, strengthen and activate the muscles, which has many benefits to both health and the ability of a subject to perform.

A particularly important advantage of the chair according to the invention is that it permits stretching of the various muscles while, for example, carrying out desk work while seated on the chair. Further, the chair according to the invention permits one to measure their existing range of motion and compare their range of motion to the human norm, and furthermore, to improve their range of motion over time.

A further advantage of the chair according to the invention is that as well as being adjustable into a desirable seating position, the chair may also be adjusted with the seat at a higher level, whereby a standing subject may stand with the buttocks of the subject partly supported on the seat.

A further advantage of the chair according to the invention when it is provided with a back rest, is that the back rest may be shaped in such a way as to allow a seated subject to retract his or her shoulder blades backwards, in other words a subject could reach his or her arms directly behind their back and have their hands together. Additionally, the backrest may be adjusted upwardly or downwardly, thereby permitting a complete range of motions of the shoulders and arms of the subject.

The invention will be more clearly understood from the following description of some preferred embodiments thereof which are given by way of example only with reference to the accompanying drawings, in which:

Fig. 1 is a front perspective view of a chair according to the invention, Fig. 2 is another front perspective view of the chair of Fig. 1 ,

Fig. 3 is a rear perspective view of the chair of Fig. 1 ,

Fig.4 is another rear perspective view of the chair of Fig. 1 ,

Fig. 5 is a front elevational view of the chair of Fig. 1 , Fig. 6 is a side elevational view of the chair of Fig. 1, Fig. 7 is another side elevational view of the chair of Fig. 1 ,

Fig. 8 is a rear end elevational view of the chair of Fig. 1, Fig. 9 is another rear end elevational view of the chair of Fig. 1 showing a portion of the chair in a different state,

Fig. 10 is a top plan view of the chair of Fig. 1 ,

Fig. 11 is an underneath plan view of the chair of Fig. 1 ,

Fig. 12 is a cross-sectional side elevational view of the chair of Fig. 1 on the line XII-XII of Fig. 10, Fig. 13 is a cut-away cross-sectional perspective view of the chair of Fig. 1,

Fig. 14 is a front perspective view of the chair of Fig. 1 illustrating a portion of the chair in a different state to that of Fig. 1 , Fig. 15 is an underneath perspective view of the chair of Fig. 1 illustrating the chair in the state of

Fig. 14,

Fig. 16 is a front elevational view of the chair of Fig. 1 in the state of Fig. 14, Fig. 17 is a side elevational view of the chair of Fig. 1 in the state of Fig. 14,

Fig. 18 is another side elevational view of the chair of Fig. 1 in the state of Fig. 14, Fig. 19 is a top plan view of the chair of Fig. 1 in a different state to that of Fig. 1 ,

Fig. 20 is a front perspective view of the chair of Fig. 1 in another state to that of Fig. 1, Fig. 21 is a rear perspective view of the chair of Fig. 1 in the state of Fig. 20, Fig. 22 is an underneath perspective view of the chair of Fig. 1 in the state of Fig. 20,

Fig. 23 is a front elevational view of the chair of Fig. 1 in the state of Fig. 20, Fig. 24 is a side elevational view of the chair of Fig. 1 in the state of Fig. 20, Fig. 25 is a top plan view of the chair of Fig. 1 in the state of Fig. 20, Fig. 26 is an underneath plan view of a detail of the chair of Fig. 1 ,

Fig. 27 is an underneath perspective view of the portion of Fig. 26 of the chair of Fig. 1, Fig. 28 is another underneath perspective view of the portion of Fig. 26 of the chair of Fig. 1 , Fig. 29 is another underneath perspective view of a further detail of the chair of Fig. 1 , Fig. 30 is an underneath perspective view of another portion of the chair of Fig. 1 , Fig. 31 is a perspective view of a detail of the chair of Fig. 1,

Fig. 32 is an exploded perspective view of the detail of Fig. 31 of the chair of Fig. 1 ,

Fig. 33 is a perspective view of two of the components of the detail of Fig. 31 of the chair of Fig. 1 ,

Fig. 34 is a perspective view of a chair according to another embodiment of the invention illustrated in a simplified form,

Fig. 35 is a perspective view of a chair according to another embodiment of the invention also illustrated in a simplified form,

Fig. 36 is a perspective view of the chair of Fig. 35 with portions of the chair illustrated in a different state to that of Fig. 35, Fig. 37 is a perspective view of a chair according to another embodiment of the invention also illustrated in a simplified form, Fig. 38 is a perspective view of the chair of Fig. 37 with portions of the chair in a different state to that of Fig. 37,

Fig. 39 is a perspective view of a chair according to another embodiment of the invention also illustrated in a simplified form,

Fig.40 is a perspective view of the chair of Fig. 39 with portions of the chair illustrated in a different state to that of Fig. 39,

Fig.41 is a perspective view of a chair according to another embodiment of the invention also illustrated in a simplified form,

Fig.42 is a perspective view of the chair of Fig. 41 with portions of the chair illustrated in a different state to that of Fig. 41,

Fig.43 is a perspective view of a chair according to another embodiment of the invention also illustrated in a simplified form,

Fig.44 is a perspective view of the chair of Fig. 43 with a portion of the chair illustrated in a different state to that of Fig. 43,

Fig.45 is a perspective view of a chair according to another embodiment of the invention also illustrated in a simplified form,

Fig.46 is a perspective view of the chair of Fig.45 with a portion of the chair illustrated in a different state to that of Fig.45,

Fig.47 is a perspective view of the chair of Fig.45 with the portion of the chair illustrated in a further different state to that of Figs. 45 and 46,

Fig. 48 is a perspective view of a chair according to another embodiment of the invention also illustrated in a simplified form, Fig. 49 is a perspective view of the chair of Fig. 48 illustrating a portion of the chair in a different state to that of Fig. 48,

Fig. 50 is a perspective view of a chair according to another embodiment of the invention also illustrated in a simplified form,

Fig. 51 is a perspective view of the chair of Fig. 50 illustrating a portion of the chair in a different state to that of Fig. 50,

Fig. 52 is a perspective view of the chair of Fig. 50 illustrating another portion of the chair in a different state to that of Fig. 50,

Fig. 53 is a perspective view of a chair according to another embodiment of the invention also illustrated in a simplified form,

Fig. 54 is a perspective view of a portion of the chair of Fig. 53 illustrating the chair in use,

Fig. 55 is a perspective view of a chair according to another embodiment of the invention also illustrated in a simplified form,

Fig. 56 is a perspective view of a chair according to another embodiment of the invention also illustrated in a simplified from,

Fig. 57 is a perspective view of a seat of a chair according to another embodiment of the invention,

Fig. 58 is a perspective view of a seat of a chair according to another embodiment of the invention,

Fig. 59 is a perspective view of a seat of a chair according to another embodiment of the invention, Fig. 60 is a perspective view of a chair according to another embodiment of the invention, and

Fig. 61 is a perspective view of a seat of a chair according to a further embodiment of the invention. Referring to the drawings and initially to Figs. 1 to 33 there is illustrated a chair according to the invention indicated generally by the reference numeral 1 , which is particularly suitable for stretching muscles of the body, and particularly, for stretching muscles associated with leg movements of the body of a subject seated on the chair. The chair 1 comprises a ground engaging support 2 having a central pod 3 extending upwardly from five radial arms 4 extending outwardly from the central pod 3 at equi-spaced apart intervals circumferentially around the central pod 3. Each radial arm 4 carries a ground engaging caster 5 at its distal end 6, although any suitable ground engaging support may be provided. The central pod 3 comprises an elongated outer tubular member 7 extending upwardly from the radial arms 4, and an elongated inner telescoping member 8 which telescopes into the outer tubular member 7 for adjusting the height of a seat 9 secured to the inner telescoping member 8. Such central pods similar to the central pod 3 of chairs 1 for adjusting the height of chairs, for example, office chairs will be well known to those skilled in the art, and further description should not be required.

A seat plate 10 of the seat 9 is mounted on the inner telescoping member 8 of the central pod 3 by a mounting element 11. A back support carrier member 12 secured to the seat plate 10 extends rearwardly from the seat plate 10 for carrying a back support member 14, which in turn carries a back support 15 of the chair 1 as will be described below.

A pair of foot support means, namely, foot support elements 13, which are carried on a carrier element 16 · which is slideably carried on the back support member 14 as will be described below, extend sidewardly from the carrier member 16 on respective opposite sides of the chair 1 adjacent the rear of the seat 9 for engaging the insteps of the feet of the subject during stretching exercises as will be described in detail below. Returning now to the seat 9, the seat 9 comprises a main seat element 17 of somewhat saddle shape construction comprising a rearward part 18 for supporting the buttocks of a seated subject on the seat 9. The rearward part 18 of the main seat element 17 extends between a rearward edge 19 and a forward edge 20. A forward part 22 of the main seat element 17 extends forwardly from the rearward part 18 from the forward edge 20 thereof, and substantially centrally from the rearward part 18. The forward part 20 defines a central longitudinally extending seat axis 24 which extends in a forward, rearward direction relative to the front 25, and the back 26 of the chair 1, see Fig. 10. The central longitudinal seat axis 24 essentially bisects the main seat element 17 and in turn the rearward part 18 and the forward part 22 thereof. The forward part 22 extends between a pair of side edges 27 on respective opposite sides of the central longitudinal seat axis 24, and the side edges 27 in this embodiment of the invention extend at a rearwardly diverging angle a to the central longitudinal seat axis 24 of approximately 6°.

The rearward part 18 of the main seat element 17 defines a central transversely extending seat axis 28 which extends transversely relative to the front 25 and the back 26 of the chair 1 , and also extends substantially transversely at right angles to the central longitudinal seat axis 24, See Fig. 10. The forward edge 20 of the rearward part 18 of the seat defines two forward edges, namely, the forward edges 20a and 20b. The forward edges 20a and 20b extend relative to the central transverse seat axis 28 at an angle Θ of approximately 4° diverging from the central transverse seat axis 28 towards the central longitudinal seat axis 24, although the angle Θ may range from 0° to 10°. The rearward part 18 of the main seat element 17 is slightly angled inwardly downwardly from the respective opposite side edges 29 of the rearward part 18 of the main seat element 17, and both the forward part 22 and the rearward part 18 of the main seat element 17 are inclined downwardly rearwardly from a portion 30 of the forward part 22 of the main seat element 17 which is located just rearwardly of the forwardmost portion 31 of the forward part 22. The downward rearward angle of inclination in this case is approximately 12° relative to the horizontal, although it may range from 0° to 20°, and preferably, 5° to 15°. The downward rearward inclination of the forward part 22 and the rearward part 18 is provided for urging the buttocks of the subject in a generally rearwardly direction so that the buttocks are firmly supported on the rearward part 18 of the main seat element 17. Additionally, the forward portion of the forward part 22 of the main seat element 10 from the portion 30 to the forwardmost portion 31 inclines downwardly forwardly relative to the horizontal at an angle of approximately 20°, although this angle may be in the range of 0° to 25°, and even 30°.

Although not illustrated in the drawings, the main seat element 17 may be pivotally coupled on the seat plate 10 about a transverse pivot shaft which would define a transverse pivot axis about which the rearward angle of inclination of the forward part 22 and the rearward part 18 of the main seat element 17 is adjustable. A suitable clamping system for clamping the main seat element 17 relative to the seat plate 10 with the main seat element 17 at the desired rearward downward angle of inclination would also be provided. A pair of thigh support elements 35 are mounted on the seat plate 10 and extend forwardly from the respective forward edges 20a and 20b of the rearward part 18 of the main seat element 17, and sidewardly from the side edges 27 of the forward part 22 of the main seat element 17. Each thigh support element 35 is provided for supporting the corresponding thigh of a subject when the subject is seated normally on the chair, and is pivotal downwardly about a horizontally extending first pivot axis 37 from a first state supporting the corresponding thigh of the subject, to a second state depending substantially downwardly from the main seat element 17, as illustrated in Figs. 14 to 18 to leave the thigh unimpeded when carrying out a stretching exercise with the corresponding foot of the subject supported on the corresponding foot support element 13 and with the thigh of the subject extending in a generally downwardly direction from the rearward part 18 of the main seat element 17 to the knee, and with the lower part of the leg of the subject from the knee downward extending in a generally rearwardly direction, either horizontally or inclined either upwardly or downwardly from the knee towards the corresponding foot support element 13, as will be described below.

Each thigh support element 35 terminates at its distal end 39 in an inner thigh engagement means, namely, an inner thigh engagement element 40 for engaging an inner portion of the corresponding thigh of the subject when the thigh support element 35 is in the first state for facilitating other stretching exercises of the leg and associated muscles of the subject as will be described below. Each inner thigh engagement element 40 is pivotally connected to the corresponding thigh support element 35 about a substantially horizontally extending second pivot axis 42, and is pivotal about the second pivot axis 42 in a generally upwardly direction from a first state as illustrated in Fig. 1 for supporting the corresponding thigh of the subject, and a second state illustrated in Fig. 20 for engaging the inner portion of the corresponding thigh of the subject as will be described below.

Each thigh support element 35 is carried on a corresponding thigh support carrier 44, which in turn is pivotally mounted on the seat plate 10 about a corresponding vertically extending main pivot axis 45 for pivoting the corresponding thigh support element 35 about the main pivot axis 45 in a generally rearwardly direction from a normal state with the thigh support element 35 extending generally forwardly and substantially parallel to the central longitudinal seat axis 24 to a stretching state illustrated in Fig. 19 for stretching the adductor muscles of a seated subject.

Before describing the pivoting of the thigh support elements 35 about the respective first pivot axes 37 and the inner thigh engagement elements 40 about the second pivot axes 42, the pivot mounting of the thigh support carriers 44 about the main pivot axes 45 will first be described.

Each thigh support carrier 44 is pivotally mounted about the corresponding main pivot axis 45 by a corresponding pivot shaft 46 which pivotally engages the seat plate 10. A fixing screw extending into a threaded bore 47 in the pivot shaft 46 secures the pivot shaft 46 in a corresponding bore in the seat plate 10. Each thigh support carrier 44 comprises an outwardly extending portion 49 which terminates at a distal end 50 to which the corresponding thigh support element 35 is pivotally coupled about the first pivot axis 37.

A releasable first hinge 52 comprises a first hinge member 53 which is secured to the corresponding thigh support carrier 44 adjacent the distal end 50 thereof, and a second hinge member 54 which is secured to the corresponding thigh support element 35. A first pivot shaft 55, which defines the corresponding first pivot axis 37, is rigidly secured to the first hinge member 53 and extends forwardly from the first hinge member 53 and rotatably and slideably carries the second hinge member 54. The hinge members 53 and 54 are provided with complementary abutting faces 56 and 57, respectively, which are configured to engage and lock the second hinge member 54 relative to the first hinge member 53 in two selectable positions which correspond to the respective first and second states of the corresponding thigh support element 35 about the first pivot axis 37. However, it will be readily appreciated that the first hinges 52 may be configured to lock the second hinge member 54 relative to the first hinge member 53, and in turn the thigh support elements 35 in one or more selectable intermediate positions between the first and second states thereof. The second hinge member 54 is spring urged out of engagement with the first hinge member 53 with the abutting faces 56 and 57 thereof disengaged from each other for facilitating pivoting the second hinge member 54 relative to the first hinge member 53, for facilitating pivoting of the corresponding thigh support element 35 in the selected one of the first and second states about the first pivot axis 37 or into selectable intermediate positions. A retaining means, in this embodiment of the invention, comprising a toggle latch member 58 pivotally coupled to the second hinge member 54 is provided for urging the first and second hinge members 53 and 54 together for in turn engaging the abutment faces 56 and 57 of the first and second hinge members 53 and 54 of the corresponding first hinge 52 for locking the corresponding thigh support element 35 in the selected one of the first and second states or in a selected one of the intermediate positions, as the case may be, of the thigh support element 35.

Returning now to the pivoting of the inner thigh engagement elements 40 about the second pivot axes 42 relative to the respective thigh support elements 35, each inner thigh support element 40 is pivotally coupled to the corresponding thigh support element 35 by a corresponding second hinge 60. Each second hinge 60 comprises a hinge member 61 which is secured to the corresponding thigh support element 35 adjacent the distal end 39 thereof, and a second hinge member 62 which is secured to the corresponding inner thigh engagement element 40. A second pivot shaft 63 extends rigidly from the first hinge member 61 of each second hinge 60 and rotatably carries the second hinge member 62. The second pivot shaft 63 defines the second pivot axis 42 above which the corresponding inner thigh engagement element 40 is pivotal between the first and second states relative to the corresponding thigh support element 35. An abutment member 64 extending forwardly from the corresponding thigh support element 35 from the distal end 39 thereof abuts and supports the corresponding inner thigh engagement element 40 when the inner thigh engagement element 40 is in the first state.

A first urging means comprising a manually operated drive means, in this embodiment of the invention provided by a manually operated hydraulic ram 65 is mounted on the seat plate 10 for simultaneously urging the thigh support elements 35 about the respective main pivot axes 45 in the generally rearward direction from the normal state to the stretching state. The hydraulic ram 65 is operably connected to a drive element 66, which is operably engageable with the thigh support elements 35 for urging the thigh support elements 35 about the respective main pivot axes 45 between the normal and stretching states thereof. The drive element 66 in this embodiment of the invention comprises a gear rack 67 having gear teeth 68 linearly located on respective opposite sides 69 of the gear rack 67. The gear teeth 68 on the respective opposite sides of the gear rack 67 engage corresponding gear teeth 70 on pinions 71, which are mounted fast on the thigh support carriers 44, so that by urging the gear rack 67 in the direction of the arrow A the thigh support carriers 44 are simultaneously pivoted about the main pivot axes 45 in the direction of the arrows B, for in turn simultaneously pivoting the thigh support elements 35 about the main pivot axes 45 from the normal state to the stretching state. On urging the gear rack 67 in the direction of the arrow C the thigh support carriers 44 are pivoted about the main pivot axes 45 in the direction of the arrows D, for in turn simultaneously pivoting the thigh support elements 35 about the main pivot axes 45 from the stretching state to the normal state. In this embodiment of the invention the gear teeth 70 on each pinion 71 define an arc, the centre of radius of which coincides with the corresponding main pivot axis 45.

In this embodiment of the invention the hydraulic ram 65 is manually operable by a pump lever 72 which increments a piston (not shown) of the ram 65 outwardly of the ram 65 for in turn incrementally urging the gear rack in the direction of the arrow A for incrementally angularly urging the thigh support elements 35 from the normal state to the stretching state about the main pivot axes 45. A release lever 73 is provided for quick release of hydraulic fluid from the hydraulic ram 65 for in turn permitting manual pivoting of the thigh support elements 35 about the main pivot axes 45 from the stretching state to the normal state. Such manual incrementally operable hydraulic rams as the hydraulic rams 65 will be well known to those skilled in the art and further description should not be required.

In this embodiment of the invention the thigh support elements 35 are pivotal about the main pivot axes 45 in the generally rearwardly directions from the normal state incrementally through incremental angular positions through a plurality of corresponding stretching states up to a maximum stretching state at an angle of 90° from the normal state.

Turning now to the back support member 14, the back support element 14 is pivotally coupled to the back support carrier member 12 by a pivot bracket 75 secured to the back support member 14, which pivotally engages a horizontally and transversely extending pivot pin 76 carried in the back support carrier member 12, for facilitating adjusting the angle of the back support 15. A strut 77 pivotally coupled to the back support member 14 by a pivot bracket 78 and a pivot pin 79 extends in a generally upwardly inclined direction towards the back support carrier member 12, A pair of slots 80 are located in the upper end 81 of the strut and slideably engage a pair of pins 82 extending sidewardly on opposite sides of the back support carrier member 12 for facilitating adjustment of the angle of the back support member 14. A quick release clamping element 84 is provided for clamping the upper end 81 of the strut 77 to the back support carrier member 12 when the back support member 14 has been adjusted to the desired angle. Urging the strut 77 in the direction of the arrow E tilts the back support rearwardly relative to the seat 9, while urging the strut 77 in the direction of the arrow F tilts the back support 15 inwardly relative to the seat 9, see Fig. 7.

Turning now to the foot support elements 13 and the carrier element 16. The carrier element 16 comprises a pair of side members 85 which are joined by a transversely extending pivot shaft 86 which in turn is pivotally carried in a mounting member 87. The mounting member 87 is slideably mounted in the back support member 14, and is slideable upwardly and downwardly along the back support member 14 for adjusting the level of the foot support elements 13 relative to the level of the seat 9 above the ground. The carrier element 16 is essentially of inverted U-shape, with the side members 85 extending generally downwardly outwardly from the pivot shaft 86 and terminating in the sidewardly outwardly extending foot support elements 13, although the carrier element may be of any suitable shape, for example, a straight bar, which would connect the foot support elements. Indeed, in certain cases the carrier element may comprise a bungee cord. The mounting member 87 is slideably mounted on a guide track 88 which extends from a lower end 89 to an upper end 90 within a groove 91 formed in the rear of the back support member 14. A retaining means, which in this embodiment of the invention is provided by a cam clamp 92 located in the mounting member 87 clamps the mounting member 87 onto the guide track 88 for retaining the mounting member 87 rigidly on the guide track 88 with the foot support elements 13 at the desired height or level relative to the height or level of the seat 9 above the ground. A lever 93 pivotally mounted on the mounting member 87 is provided for operating the cam clamp 92 for both releasing the cam clamp 92 from the guide track 88 for facilitating upward and downward sliding movement of the mounting member 87 on the guide track 88, and for clamping the mounting member 87 rigidly onto the guide track 88, although it will be appreciated that any suitable retaining means may be provided for retaining the mounting element 87 at the desired position along the guide track.

The transverse pivot shaft 86 which is rotatably mounted in the mounting member 87 facilitates pivoting of the carrier element 16, and in turn the foot support elements 13 backwardly and forwardly relative to the seat 9 of the chair 1 , for facilitating adjustment of the position of the foot support elements 13 relative to the seat 9. The foot support elements 13 are pivotal in the direction of the arrows G and H for urging the foot support elements 13 forwardly and backwardly, respectively, relative to the seat 9, see Fig. 7.

It is envisaged that the carrier element may be pivoted rearwardly from a vertically downwardly extending direction to extend substantially horizontally from the transverse pivot axis defined by the transverse pivot shaft 86. It is also envisaged that a releasable locking or latching means may be provided for retaining the carrier element 16 in a desired angular position about the transverse pivot axis defined by the transverse pivot shaft 86 for in turn releasably retaining the foot support elements in a desired position. It is envisaged that such a locking or latching arrangement, may be provided by a ratchet mechanism, which would permit free pivoting of the carrier element 16 about the transverse pivot axis defined by the transverse pivot shaft 86 in a rearwardly direction, namely, in the direction of the arrow H and would prevent pivoting of the carrier element 16 about the transverse pivot axis defined by the transverse pivot shaft 86 in a forwardly direction, namely, in the direction of the arrow G, see Fig. 7. A release latch would be provided for releasing a pawl of the ratchet mechanism to permit selective free pivoting of the carrier element about the transverse pivot axis defined by the transverse pivot shaft 86 in the forward direction of the arrow G.

Although not essential, arm rests 94 extend from the back support member 14 for supporting the arms of a subject when seated on the chair 1. The arm rests 94 may or may not be adjustable, for example, the arm rests 94 may be adjustable upwardly and downwardly along the back support member 14. In use, the height of the seat 9 is initially adjusted by adjusting the inner telescoping member 8 in the outer tubular member 7 of the central pod 3 in a known manner. The angle of the back support 15 is adjusted to the desired angle of inclination by adjusting the position of the strut 77 relative to the back support carrier member 12. With the level of the seat 9 and the angle of inclination of the back support 15 5 adjusted to the desired level and angle, respectively, the chair 1 is ready for use. A subject wishing to sit on the chair merely sits on the chair with the thigh support elements in the normal state about the main pivot axes 45 and the first state about the first pivot axes 37, and with the inner thigh engagement elements 40 in the first state about the second pivot axes 42. l o When it is desired to stretch the quadriceps and the hip flexor muscles associated with one of the legs of the subject, the foot support elements 13 are adjusted to the desired height relative to the seat 9 by urging the mounting member 87 upwardly or downwardly, as the case may be, along the guide track 88 in the back support member 14. The thigh support element 35 corresponding to the leg, the associated muscles of which are to be stretched, with the corresponding inner thigh engagement element 40 in the first state,

15 is pivoted about the corresponding first pivot axis 37 downwardly from the first state to the second state, so that both that thigh support element 35 and the corresponding inner thigh engagement element 40 depend downwardly from the corresponding first pivot axis 37. In this state, the thigh support element 35 and the corresponding inner thigh engagement element 40 are clear of the thigh of the subject, and movement of the thigh is unimpeded by the thigh support element 35 and the inner thigh engagement 0 element 40. With the subject sitting on the seat 9 with his or her buttocks supported on the rearward part 18 of the main seat element 17, the subject urges his or her thigh corresponding to the thigh support element 35, which is in the second state,^' generally downwardly from the rearward part 18 of the main seat element 17. The seated subject then urges his or her lower leg rearwardly and places the instep of his or her corresponding foot on the corresponding foot support element 13 for in turn stretching the quadriceps 5 and the hip flexor muscles. Periodically during this stretching exercise, the subject may, by raising the foot support elements 13 upwardly, increase the degree by which the quadriceps and the hip flexor muscles are being stretched. The raising of the foot support elements 13 may be carried out a number of times during the stretching of the quadriceps and the hip flexor muscles. 0 Additionally, the subject may also increase the intensity of the stretch by pushing the corresponding foot support element 13 rearwardly, resulting in the foot support element 13 pivoting rearwardly about the pivot shaft 86. The carrier element 16 and the foot support elements 13 would then be retained in position by the latching arrangement discussed above, where such a latching arrangement is provided, while the increased intensity stretch is being maintained.

When it is desired to stretch the quadriceps and the hip flexor muscles associated with the other leg, the thigh support element 35 which is in the second downward state is pivoted about the corresponding first pivot axis 37 upwardly into the first state, and the other thigh support element 35, with the inner thigh engagement element 40 in the first state is pivoted downwardly about the corresponding first pivot axis 37 from the first state to the second state. The seated subject then urges the leg corresponding to the thigh support element 35 which is now in the downwardly extending second state downwardly and rests the corresponding foot on the corresponding foot support element 13 as already described, and the stretching exercise for stretching the quadriceps and hip flexor muscles is carried out as already described.

When it is desired to stretch the adductor muscles, the thigh support elements 35 in the first state are pivoted about the main pivot axes 45 into the normal state with the thigh support elements 35 extending forwardly substantially parallel to the central longitudinal seat axis 24. The inner thigh engagement elements 40 are pivoted about the second pivot axis from the first state to the second state. The subject sits on the seat 9 with his or her thighs supported on the respective thigh support elements 35 and with the inner thigh engagement elements 40 abutting the inner portions of the respective thighs of the subject. The subject seated on the chair then operates the pump lever 72 for operating the hydraulic ram 65 to simultaneously incrementally pivot the thigh support elements 35 generally rearwardly away from each other about the main pivot axes 45 from the normal state to a desired one of the stretching states with the thigh support elements 35 diverging from each other. The inner thigh engagement elements 40 abutting the inner portions of the thighs of the subject urge the thighs of the subject apart as the thigh support elements 35 are being urged into the desired one of the stretching states about the main pivot axes 37, thereby stretching the adductor muscles. The incremental pivoting of the thigh support elements 35 about the main pivot axes 45 continues until the adductor muscles are stretched to a desired degree. The thigh support elements 35 are retained in the desired stretching state by the hydraulic ram 65 with the thighs spread in order to maintain the adductor muscles stretched to the desired degree for a desired time period. Periodically during the stretching of the adductor muscles, the degree to which the adductor muscles are stretched may be increased by further incrementally increasing the angle by which the thigh support elements 35 are pivoted rearwardly about the main pivot axes 45 by manually operating the hydraulic ram 65.

When the adductor muscles have been stretched to the desired degree for the desired time period, the seated subject operates the release lever 73 for releasing the hydraulic fluid from the hydraulic ram 65 so that the thigh support elements 35 can be returned manually from the stretching state to the normal state about the respective main pivot axes 45. Referring now to Fig. 34 there is illustrated a chair according to another embodiment of the invention indicated generally by the reference numeral 100. The chair 100 is illustrated as a simplified version of the chair 1, however, where relevant similar components are identified by the same reference numerals. In this embodiment of the invention the back support 15 is not illustrated as being adjustable. Additionally, foot support elements similar to the foot support elements 13 of the chair 1 are not illustrated. However, it is envisaged that foot support elements similar to the foot support elements 13 of the chair 1 will be provided extending from respective opposite sides of the chair. The support elements similar to the support elements 13 may be mounted on and extend from the central pod 3 or may be carried on a downwardly extending member from the back support member 14. The seat 9 of the chair 100 comprises a main seat element 17 and a pair of thigh support elements 35 extending from the main seat element 17. The mounting of the main seat element 17 of the seat 9 to the chair 100 is substantially similar to that of the seat 9 to the chair 1 , and the mounting of the thigh support elements 35 to the seat plate (not shown) of the chair 100 according to this embodiment of the invention is similar to the mounting of the thigh support elements 35 of the seat 9 to the seat plate 10 of the chair 1 , and the thigh support elements 35 are pivotal from the normal state to the stretching state around the main pivot axis (not shown). The only difference between the thigh support elements 35 of the chair 100 and the thigh support elements 35 of the chair 1 is that the inner thigh engagement elements have been omitted. However, it is envisaged that in this embodiment of the invention the thigh support elements 35 of the chair 100 may be pivotal only about the respective first pivot axes 37. It is envisaged that the thigh supporting elements 35 of this embodiment of the invention may not be pivotal about the main pivot axis between the normal state and the stretching state or states. In which case, the thigh support elements would be pivotal about respective first pivot shafts which define the respective first pivot axes 37 and which would extend rigidly from the forward part 22 of the main seat element 17, and which would pivotally engage the thigh support elements 35 about the respective first pivot axes 37.

Referring now to Figs. 35 and 36 there is illustrated a chair according to another embodiment of the invention indicated generally by the reference numeral 110. The chair 110 is illustrated as a simplified version of the chair 1 , however, where relevant similar components are identified by the same reference numerals. In this embodiment of the invention the back support 15 is not illustrated as being adjustable. Additionally, foot support elements similar to the foot support elements 13 of the chair 1 are not illustrated. However, it is envisaged that foot support elements similar to the foot support elements 13 of the chair 1 will be provided extending from respective opposite sides of the chair. The support elements similar to the support elements 13 may be mounted on and extend from the central pod 3 or may be carried on a downwardly extending member from the back support member 14.

In this embodiment of the invention the seat 9 of the chair 110 comprises a main seat element 111 which in turn comprises a rearward part 112 for supporting the buttocks of a seated subject. A pair of thigh support elements 113 extend forwardly from the rearward part 112 of the main seat element 111. The thigh support elements 113 are provided without inner thigh engagement elements, and are carried on a pair of thigh support carriers 115 which in turn are pivotally coupled to the seat plate 10 about respective vertically extending main pivot axes 45 for facilitating pivoting of the thigh support elements 113 about the main pivot axes 45 from the normal state illustrated in Fig. 35 to a stretching state diverging forwardly from each other illustrated in Fig. 36 for stretching the adductor muscles. In this embodiment of the invention the thigh support elements 113 are pivotal about the main pivot axes 45 through an angle of 180° relative to each other. In other words, each thigh support element 113 is pivotal about the corresponding main pivot axis 45 through an angle of 90° from the normal forwardly extending state to the maximum one of the stretching state. Additionally, each thigh support element 113 is pivotal relative to the corresponding thigh support element 115 about a corresponding horizontally extending first pivot axis 37 defined by the corresponding thigh support carrier 115. Each thigh support element 113 is pivotal downwardly about the corresponding first pivot axis 37 from a first state extending substantially horizontally for supporting the corresponding thigh of a seated subject to a second state with the thigh support element 113 extending downwardly from the first pivot axis 37 clear of the corresponding thigh of the subject, for facilitating extending of the corresponding thigh of the subject generally downwardly from the rearward part 112 for stretching the quadriceps and hip flexor muscles as already described with reference to the chair 1. Additionally, in this embodiment of the invention each thigh support element 113 is pivotal upwardly from the first state to a third state with the thigh support element 113 extending upwardly as illustrated in Fig. 36, so that the thigh support elements 113 act as inner thigh engagement elements for engaging an inner portion of the corresponding thigh of a subject for in turn urging the thighs of the subject apart for stretching the adductor muscles when the thigh support elements in the third state are pivoted about the respective main pivot axes 45 from the normal forwardly extending state to the stretching state. Referring now to Figs. 37 and 38, there is illustrated a chair according to another embodiment of the invention indicated generally by the reference numeral 120. The chair 120 is illustrated as a simplified version of the chair 1, however, where relevant similar components are identified by the same reference numerals. In this embodiment of the invention the back support 15 is not illustrated as being adjustable. Additionally, foot support elements similar to the foot support elements 13 of the chair 1 are not illustrated. However, it is envisaged that foot support elements similar to the foot support elements 13 of the chair 1 will be provided extending from respective opposite sides of the chair. The support elements similar to the support elements 13 may be mounted on and extend from the central pod 3 or may be carried on a downwardly extending member from the back support member 14.

In this embodiment of the invention the rearward part of the seat 9 of the chair 120 is provided in two parts by a pair of buttock supporting elements 121, each of which is pivotally mounted on a seat plate 10 about corresponding vertically extending main pivot axes 45. In this embodiment of the invention respective thigh support elements 124 are pivotally coupled to the respective buttock supporting elements 121 about corresponding horizontally extending first pivot axes 37. The first pivot axes 37 are defined by respective pivot shafts 126 extending from the respective buttock supporting elements 121. In this embodiment of the invention the buttock supporting elements 121 are pivotal about the main pivot axes 45 with the thigh support elements 124 as the thigh support elements 124 are pivoted about the main pivot axes 45 from the normal forwardly extending state illustrated in Fig. 37 to the stretching state for stretching the adductor muscles of a seated subject. In this embodiment of the invention each thigh support element 124 is pivotal downwardly about the first pivot axis 37 from a first state extending substantially horizontally to a second state extending downwardly from the corresponding first pivot axis 37 and from the first state upwardly about the first pivot axis 37 to a third state extending upwardly from the first pivot axis 125 in a similar manner as the thigh support elements 113 of the chair 110 described with reference to Figs. 35 and 36 are pivotal from the first state downwardly to the second state, and from the first state upwardly to the third state.

Referring now to Figs. 39 and 40 there is illustrated a chair according to another embodiment of the invention indicated generally by the reference numeral 130. The chair 130 is illustrated as a simplified version of the chair 1, however, where relevant similar components are identified by the same reference numerals. In this embodiment of the invention the back support 15 is not illustrated as being adjustable. Additionally, foot support elements similar to the foot support elements 13 of the chair 1 are not illustrated. However, it is envisaged that foot support elements similar to the foot support elements 13 of the chair 1 will be provided extending from respective opposite sides of the chair. The support elements similar to the support elements 13 may be mounted on and extend from the central pod 3 or may be carried on a downwardly extending member from the back support member 14. The chair 130 is somewhat similar to the chair 120 and comprises a seat 9 in which the rearward part thereof is also formed by a pair of buttock supporting elements 131 which are substantially similar to the buttock supporting elements 121 of the chair 120 of Figs. 37 and 38. The buttock supporting elements 131 are pivotally coupled to the seat plate 10 about vertically extending main pivot axes 45. In this embodiment of the invention the thigh support elements 133 extend forwardly from the buttock supporting elements 131, but extend rigidly from the buttock supporting elements 131. In this embodiment of the invention the buttock supporting elements 131 pivot about the main pivot axis 45 with the thigh support elements 133 as the thigh support elements 133 are being pivoted from the normal forwardly extending state to the stretching state. Additionally, in this embodiment of the invention inner thigh engagement elements 134 are slideably mounted in slots 135 extending through the thigh support elements 133 for engaging inner portions of the respective thighs of a seated subject. The inner thigh engagement elements 134 are slideable upwardly in the corresponding slots 135 from a first state illustrated in Fig. 39 disengaged from the inner portion of the thighs of a seated subject to a second state illustrated in Fig. 40 for abutting the inner portions of the respective thighs, as the thigh support elements 133 and the buttock supporting elements 131 are being pivoted from the normal state to the stretching state about the main pivot axes 45 for in turn urging the thighs of the seated subject apart for stretching the adductor muscles.

Referring now to Figs. 41 and 42 there is illustrated a chair according to another embodiment of the invention indicated generally by the reference numeral 140. The chair 140 is illustrated as a simplified version of the chair 1 , however, where relevant similar components are identified by the same reference numerals. In this embodiment of the invention the back support 15 is not illustrated as being adjustable. Additionally, foot support elements similar to the foot support elements 13 of the chair 1 are not illustrated. However, it is envisaged that foot support elements similar to the foot support elements 13 of the chair 1 will be provided extending from respective opposite sides of the chair. The support elements similar to the support elements 13 may be mounted on and extend from the central pod 3 or may be carried on a downwardly extending member from the back support member 14. The chair 140 is somewhat similar to the chairs 120 and 130 of Figs. 37 to 40, and in this embodiment of the invention comprises a seat 9, the rearward part thereof is formed by a pair of buttock supporting elements 141 in similar manner as the seat

9 of the chairs 120 and 130. The buttock supporting elements 141 are pivotally coupled to the seat plate

10 about respective vertically extending main pivot axes 45. A forward portion 144 of each buttock supporting element 141 supports an upper part of the corresponding thigh of a seated subject. However, in this embodiment of the invention each buttock support element 141 comprises an upwardly extending inner thigh engagement element 145 which is rigidly secured to the corresponding buttock supporting element 141 and extends rigidly upwardly and forwardly therefrom for abutting an inner portion of the corresponding thigh of a seated subject. Use of the chair 140 for stretching the adductor muscles and the quadriceps and the hip flexor muscles of a seated subject is similar to the operation of the chairs 120 and 130 of Figs. 37 to 40, with the exception that the inner thigh engagement elements 145 are not operable between first and second states but rather are permanently in the second state. Referring now to Figs.43 and 44 there is illustrated a chair according to another embodiment of the invention indicated generally by the reference numeral 150. The chair 150 is illustrated as a simplified version of the chair 1, however, where relevant similar components are identified by the same reference numerals. In this embodiment of the invention the back support 15 is not illustrated as being adjustable. Additionally, foot support elements similar to the foot support elements 13 of the chair 1 are not illustrated. However, it is envisaged that foot support elements similar to the foot support elements 13 of the chair 1 will be provided extending from respective opposite sides of the chair. The support elements similar to the support elements 13 may be mounted on and extend from the central pod 3 or may be carried on a downwardly extending member from the back support member 14. In this embodiment of the invention the chair 150 comprises a seat 9 which in turn comprises a main seat element 151 of saddle shape construction, which is somewhat similar to the saddle shape construction of the main seat element 17 of the seat 9 of the chair 1. In this embodiment of the invention a single thigh support element 152 is provided for alternately supporting the thighs of a seated subject. The single thigh support element 152 is pivotally coupled to the main seat element 151 about a first pivot axis 37, which in this embodiment of the invention extends vertically, and is located in a forward portion 154 of the main seat element 151. The single thigh support element 152 is pivotal about the first pivot axis 37 in the direction of the arrows and N through an angle of 90° between a first state illustrated in Fig. 43 for supporting a right thigh of a seated subject and clear of a left thigh of the seated subject, so that the left thigh of the seated subject can be extended downwardly from the main seat element 151 for stretching the quadriceps and hip flexor muscles of the left leg as already described with reference to the chair 1 , and a second state illustrated in Fig.44 for supporting the left thigh of the seated subject and clear of the right thigh, with the right thigh unsupported, so that the right thigh can be extended downwardly from the main seat element 151 for stretching the quadriceps and the hip flexor muscles of the right leg as already described with reference to the chair of Fig. 1.

Referring now to Figs. 45 to 47 there is illustrated a chair according to another embodiment of the invention indicated generally by the reference numeral 160. The chair 160 is illustrated as a simplified version of the chair 1 , however, where relevant similar components are identified by the same reference numerals. In this embodiment of the invention the back support 15 is not illustrated as being adjustable. Additionally, foot support elements similar to the foot support elements 13 of the chair 1 are not illustrated. However, it is envisaged that foot support elements similar to the foot support elements 13 of the chair 1 will be provided extending from respective opposite sides of the chair. The support elements similar to the support elements 13 may be mounted on and extend from the central pod 3 or may be carried on a downwardly extending member from the back support member 14.

In this embodiment of the invention the chair 160 comprises a seat 9 comprising a main seat element 161, which is similar to the main seat element 151 of the chair 150 of Figs. 43 and 44. The main difference between the chair 160 and the chair 150, lies in the single thigh support element 162. In this embodiment of the invention the single thigh support element 162 is pivotal about the vertically extending first pivot axis 37 and is pivotal from a first state illustrated in Fig. 46 supporting the left thigh of a seated subject with the right thigh unsupported through a third state illustrated in Fig. 45 supporting both thighs of a seated subject simultaneously, to a second state not illustrated, but which is a mirror image of the state of Fig.46 with the right thigh of the subject supported and the left thigh of the subject unsupported. Additionally, the single thigh support element 162 is pivotal from either the first or second state into a fourth state illustrated in Fig. 47 beneath the main seat element 161 with neither the thighs of the subject supported. In the first and second states of the thigh support element 162 the right and left thighs, respectively, of a seated subject may be extended downwardly from the main seat element 161 for stretching the quadriceps and hip flexor muscles. In the fourth state illustrated in Fig.47, a subject may sit on the seat with the buttocks of the seated subject supported on the main seat element 141, and with the thighs and legs unsupported and extending downwardly from the main seat element 161. Typically, in the fourth state illustrated in Fig. 47, the level of the seat 9 would be raised to a level where a subject would be almost in a standing position with the buttocks of the subject supported on the main seat element 161. In the third state of the single thigh support element 162 illustrated in Fig. 45, the chair may be used as a conventional chair or the chair may be used for stretching the adductor muscles.

Referring now to Figs.48 and 49 there is illustrated a chair according to another embodiment of the invention indicated generally by the reference numeral 170. The chair 170 is illustrated as a simplified version of the chair 1 , however, where relevant similar components are identified by the same reference numerals. In this embodiment of the invention the back support 15 is not illustrated as being adjustable. Additionally, foot support elements similar to the foot support elements 13 of the chair 1 are not illustrated. However, it is envisaged that foot support elements similar to the foot support elements 13 of the chair 1 will be provided extending from respective opposite sides of the chair. The support elements similar to the support elements 13 may be mounted on and extend from the central pod 3 or may be carried on a downwardly extending member from the back support member 1 . The chair 170 in this embodiment of the invention comprises a seat 9 which is formed by a single main seat element 171 which in this embodiment of the invention is of L-shape construction when viewed in plan. The main seat element 171 is pivotal about a vertically extending first pivot axis 37. The first pivot axis 37 is located adjacent the joint 173 of inner side edges 174 of first and second legs 175 and 176, respectively of the L-shape main seat element 171. The single main seat element 171 is pivotal about the first pivot axis 37 from a first state illustrated in Fig. 48 to a second state illustrated in Fig.49. In the first state illustrated in Fig.48 the first leg 175 of the main seat element 171 forms a buttocks supporting element for supporting the buttocks of the seated subject, while the second leg 176 of the main seat element 171 supports the right thigh of a seated subject. In the first state of the main seat element 171 the left thigh of the seated subject is unsupported for facilitating extending the left thigh of the subject downwardly from the first leg 175 of the main seat element 171 for facilitating stretching of the quadriceps and hip flexor muscles as already described with reference to the chair 1. In the second state of the main seat element 171 illustrated in Fig. 49 the second leg 176 of the main seat element 171 forms a buttocks supporting element for supporting the buttocks of a seated subject, and the first leg 175 supports the left thigh of the seated subject. In the second state of the main seat element 171 the right thigh of the seated subject is unsupported, and can be extended downwardly from the second leg 176 of the main seat element 171 for facilitating stretching of the quadriceps and the hip flexor muscles.

The chair 170 of this embodiment of the invention is suitable for use in the stretching of the quadriceps and hip flexor muscles, but is not particularly suitable for stretching the adductor muscles.

Referring now to Figs. 50 to 52, there is illustrated a chair according to another embodiment of the invention indicated generally by the reference numeral 180. The chair 180 is illustrated as a simplified version of the chair 1, however, where relevant similar components are identified by the same reference numerals. In this embodiment of the invention the back support 15 is not illustrated as being adjustable. Additionally, foot support elements similar to the foot support elements 13 of the chair 1 are not illustrated. However, it is envisaged that foot support elements similar to the foot support elements 13 of the chair 1 will be provided extending from respective opposite sides of the chair. The support elements similar to the support elements 13 may be mounted on and extend from the central pod 3 or may be carried on a downwardly extending member from the back support member 14.

The chair 180 is substantially similar to the chair 170, and comprises a seat formed by a main seat element 181. The main seat element 181 comprises a pair of seat elements 182a and 182b, each of which is similarto the main seat element 171 of the seat 9 of the chair 170. Both seat elements 182a and 182b are of L-shape construction, and both are pivotal about a vertically extending first pivot axis 37. In this embodiment of the invention the seat elements 182a and 182b are simultaneously pivotal about the first pivot axis 37 between respective first and second states illustrated in Figs. 51 and 52, respectively. In Fig. 51 both of the seat elements 182a and 182b are illustrated in the first state, while in Fig. 52 both of the seat elements 182a and 182b are illustrated in the second state. In Fig. 50 one of the seat elements 182, namely, the seat element 182a is illustrated in the first state, while the other one of the seat elements 182b is illustrated in the second state. When the two seat elements 182a and 182b are both in either the first state or the second state as illustrated in Figs. 51 and 52, the quadriceps and hip flexor muscles of the corresponding one of the thighs of a seated subject may be stretched. When one of the seat elements 182 is in the first state and the other of the seat elements 182 is in the second state as illustrated in Figs. 50, the chair 180 is suitable for use as a conventional chair with the buttocks and both the thighs of a subject supported. In the state of Fig. 50 with the two seat elements 182 in the respective first and second states, the chair 180 may be used for stretching the adductor muscles. Referring now to Figs. 53 and 54 there is illustrated a chair according to another embodiment of the invention indicated generally by the reference numeral 190. The chair 190 is illustrated as a simplified version of the chair 1 , however, where relevant similar components are identified by the same reference numerals. In this embodiment of the invention the back support 15 is not illustrated as being adjustable. Additionally, foot support elements similar to the foot support elements 13 of the chair 1 are not illustrated. In this embodiment of the invention, foot support elements similar to the foot support elements 13 of the chair 1 extending from respective opposite sides of the chair may or may not be provided. If provided, the foot support elements similar to the foot support elements 13 may be mounted on and extend from the central pod 3 or may be carried on a downwardly extending member from the back support member 14. The chair 190 comprises a seat 9 which comprises a pair of seat elements 191a and 191b. Each seat element 191 is configured to support a corresponding buttock and thigh of a seated subject. The seat elements 191 are each pivotal about a corresponding horizontally and longitudinally extending first pivot axis 37 from a first state for supporting the corresponding buttock and thigh of a seated subject to a second state with the seat element 191 extending downwardly from the corresponding first pivot axis 37 clear of the corresponding buttock and thigh of the subject for facilitating extending the corresponding thigh of the subject downwardly from stretching the quadriceps and hip flexor muscles. Additionally, in this embodiment of the invention instead of or as well as providing foot support elements similar to the foot support elements 13 of the chair 1, on respective opposite sides of the chair, knee engaging and supporting elements 193 are adjustably mounted on the respective opposite sides of the chair for engaging and supporting a corresponding knee of a subject during stretching of the corresponding quadriceps and hip flexor muscles.

In use, when it is desired to stretch the quadriceps and hip flexor muscles of the right leg of the subject, the seat element 191b is pivoted from the first state to the downwardly extending second state, as illustrated in Fig. 54. With the seat element 191a in the first state, the subject sits on the seat 9 with the buttock and thigh of the left leg supported on the seat element 191a in the first state. The subject extends the right thigh downwardly and engages the knee in the knee engaging and supporting element 193.

Depending on the degree of stretching of the quadriceps and hip flexor muscles, the corresponding knee engaging and supporting element 193 may be adjustable forwardly and backwardly. The more the corresponding knee engaging and supporting element 193 is urged rearwardly the greater will be the stretching of the quadriceps and hip flexor muscles.

When it is desired to stretch the quadriceps and hip flexor muscles of the left thigh, the seat element 191a is pivoted from the first state downwardly to the second state, and the seat element 191 b is pivoted from the downward second state to the first state for supporting the buttock and corresponding right thigh of a seated subject. When it is desired to use the chair 190 as a convention chair or for stretching the adductor muscles, both the seat elements 191a and 191b are urged into the first state. Referring now to Fig. 55 there is illustrated a chair according to another embodiment of the invention indicated generally by the reference numeral 200. The chair 200 is illustrated as a simplified version of the chair 1, however, where relevant similar components are identified by the same reference numerals. In this embodiment of the invention the back support 15 is not illustrated as being adjustable. Additionally, foot support elements similar to the foot support elements 13 of the chair 1 are not illustrated. However, it is envisaged that foot support elements similar to the foot support elements 13 of the chair 1 will be provided extending from respective opposite sides of the chair. The support elements similar to the support elements 13 may be mounted on and extend from the central pod 3 or may be carried on a downwardly extending member from the back support member 14.

The chair 200 comprises a seat 9 which comprises a pair of seat elements 201. Each seat element 201 is configured to support the buttocks and a corresponding thigh of a seated subject. The seat elements 201 are pivotal between the first and second states about a first pivot axis 37, which in this embodiment of the invention extends horizontally and transversely of the chair 200. Accordingly, when it is desired to stretch the quadriceps and hip flexor muscles of the right leg, the seat element 201a is urged into the first state, and the seat element 201b is urged into the second state, as illustrated in Figs. 55 and 56. When it is desired to stretch the quadriceps and hip flexor muscles of the left leg, the seat element 201a is urged into the second state, and the seat element 201b is urged into the first state. When it is desired to use the chair as a conventional chair or to stretch the adductor muscles, the seat elements 201a and 201 b are urged into the first state.

Referring now to Fig. 56 there is illustrated a chair according to another embodiment of the invention indicated generally by the reference numeral 210. The chair 210 is illustrated as a simplified version of the chair 1 , however, where relevant similar components are identified by the same reference numerals. In this embodiment of the invention the back support 15 is not illustrated as being adjustable. Additionally, foot support elements similar to the foot support elements 13 of the chair 1 are not illustrated: However, it is envisaged that foot support elements similar to the foot support elements 13 of the chair 1 will be provided extending from respective opposite sides of the chair. The support elements similar to the support elements 13 may be mounted on and extend from the central pod 3 or may be carried on a downwardly extending member from the back support member 1 .

In this embodiment of the invention the chair 210 comprises a seat 9 comprising a main seat element 211 which is substantially similar to the main seat element 17 of the chair 1. In this embodiment of the invention a pair of thigh support elements 212 are pivotal about a horizontal transversely extending first pivot axis 37 which extends substantially parallel to the central transverse seat axis 28 of the chair 210. In this embodiment of the invention the thigh support elements 212 are pivotal downwardly about the first pivot axis 37 from a first state extending forwardly from the main seat element 211 for supporting the corresponding thigh of a seated subject, to a second state extending downwardly from the first pivot axis 37 clear of the corresponding thigh for facilitating stretching of the quadriceps and hip flexor muscles of that thigh. When it is desired to stretch the quadriceps and hip flexor muscles of the right thigh, the thigh support element 212a is operated in the first state and the thigh support element 212b is operated in the second state, and vice versa for stretching the left quadriceps and hip flexor muscles. When it is desired to use the chair as a conventional chair or to stretch the adductor muscles, the thigh support elements 212 are operated into the first state.

Referring now to Fig. 57 there is illustrated a seat indicated generally by the reference numeral 220 of a chair (not shown) according to another embodiment of the invention. The chair according to this embodiment of the invention is substantially similar to the chair 1 , and as well as comprising the seat 220 also comprises a ground engaging support and a central pod as well as a back support. The chair according to this embodiment of the invention also comprises a pair of foot support elements similar to the foot support elements 13 of the chair 1 extending on respective opposite sides of the chair according to this embodiment of the invention.

In this embodiment of the invention the seat 220 comprises a rearward part 221 which is similar to the rearward part 18 of the seat 9 of the chair 1. However, in this embodiment of the invention only a single thigh support element 222 is provided. The single thigh support element 222 is pivotally connected to the rearward part 221 about a first horizontal transversely extending pivot axis 37. Hinges 225 hingedly couple the single thigh support element 222 to the rearward part 221 of the seat 220 about the first pivot axis 37. The single thigh support element is pivotal from a first state illustrated in full lines in Fig. 57 downwardly to a second state illustrated in broken lines in Fig. 57 with the single thigh support element 222 extending downwardly from the first pivot axis 37. In the first state illustrated in full lines in Fig. 57 the single thigh support element 222 supports both thighs of a seated subject, while in the second state of the single thigh support element 222 neither of the thighs of the subject are supported, and accordingly, in the second state of the single thigh support element 222 either one of the quadriceps and hip flexor muscles of the legs of a seated subject may be stretched.

Referring now to Fig. 58 there is illustrated a seat indicated generally by the reference numeral 230 of a chair (not shown) according to another embodiment of the invention. The chair of this embodiment of the invention is substantially similar to the chair of Fig. 1 , and as well as comprising the seat 230 also comprises a ground engaging support and a central pod as well as a back support. The chair according to this embodiment of the invention also comprises a pair of foot support elements similar to the foot support elements 13 of the chair 1 extending on respective opposite sides of the chair according to this embodiment of the invention.

In this embodiment of the invention the seat 230 of the chair comprises a main seat element 231 which is configured to support the buttocks and both thighs of a subject. However, the single seat element 231 is slideably mounted on a seat plate (not shown) of the chair, and is slideably rearwardly from a first state illustrated in full lines in Fig. 58 for supporting the buttocks and the corresponding thighs of a subject to a second state illustrated in broken lines in Fig. 58 whereby the single seat element 231 is configured to support only the buttocks of a subject with the thighs of the subject unsupported for facilitating stretching of the quadriceps and hip flexor muscles as already described with reference to the chair 1. When it is desired to use the chair as a conventional chair, the single seat element 231 is urged forwardly into the first state illustrated in full lines in Fig. 58, and in the first state of the single seat element 231 the adductor muscles may also be exercised.

Referring now to Fig. 59 there is illustrated a seat indicated generally by the reference number 240 of a chair according to another embodiment of the invention. The chair according to this embodiment of the invention is substantially similar to the chair 1 , and as well as comprising the seat 240 also comprises a ground engaging support and a central pod as well as a back support. The chair according to this embodiment of the invention also comprises a pair of foot support elements similar to the foot support elements 13 of the chair 1 extending on respective opposite sides of the chair according to this embodiment of the invention. The seat 240 of the chair according to this embodiment of the invention comprises a pair of seat elements 241 which are slideably mounted on a seat plate (not shown) of the chair, and are slideable relative to each other between respective first and second states. Each seat element 241 is slideable rearwardly from a first state in which the seat element 241 , such as the seat element 241b is illustrated in Fig. 59 for supporting the buttocks and a corresponding thigh of a seated subject to the second state in which the seat element 241a is illustrated in Fig. 59 for supporting the buttocks only of the subject with the corresponding thigh of the subject unsupported.

Referring now to Fig. 60 there is illustrated a seat indicated generally by the reference numeral 250 of a chair according to another embodiment of the invention. The chair of this embodiment of the invention is substantially similar to the chair 1 , and as well as comprising the seat 250 also comprises a ground engaging support and a central pod as well as a back support. The chair according to this embodiment of the invention also comprises a pair of foot support elements similar to the foot support elements 13 of the chair 1 extending on respective opposite sides of the chair according to this embodiment of the invention. In this embodiment of the invention the seat 250 comprises a rearward buttocks supporting part 251 which is substantially similar to the rearward buttocks supporting part 18 of the chair 1. A single thigh support element 252 is provided and is slideable transversely between first and second states through a third state. In the first state illustrated in broken lines in Fig. 1 the single thigh support element 252 is configured for supporting the right thigh of a seated subject, and is clear of the left thigh of the seated subject, so that the left thigh of the seated subject is unsupported for stretching of the quadriceps and hip flexor muscles. In the third state illustrated in full lines in Fig. 60 the thigh support element is configured for supporting both thighs of a seated subject. In the second state (not shown) the thigh support element is urged in the direction of the arrow S into the mirror image of the first state which is illustrated in broken lines in Fig. 60, so that the single thigh support element supports the left thigh of a seated subject with the right thigh of the seated subject unsupported for stretching of the quadriceps and hip flexor muscles of the right thigh.

When it is desired to use the chair as a convention chair, the single thigh support element 252 is urged into the third state illustrated in full lines in Fig. 60, and in the third state, the chair according to this embodiment of the invention may also be used for stretching the adductor muscles.

Referring now to Fig. 61 there is illustrated a seat indicated generally by the reference numeral 260 of a chair according to another embodiment of the invention. The chair according to this embodiment of the invention is substantially similar to the chair 1, and as well as comprising the seat 260 also comprises a ground engaging support and a central pod as well as a back support. The chair according to this embodiment of the invention also comprises a pair of foot support elements similar to the foot support elements 13 of the chair 1 extending on respective opposite sides of the chair according to this embodiment of the invention. In this embodiment of the invention the seat 260 comprises a rearward buttocks supporting part 261 which is similar to the buttocks support part 18 of the chair 1. A pair of thigh support elements 264 are provided for supporting the respective thighs of a seated subject. However, in this embodiment of the invention the thigh support elements 264 are detachable from the rearward part 261 of the seat 260. In a first state of the respective thigh support elements 264 the thigh support elements 264 are engaged and secured to the rearward part 261 for supporting the thighs of a seated subject. Each thigh support element 264 comprises a pair of spaced apart spigots 265 extending rearwardly from the thigh support elements 264. The spigots 265 are configured for releasably engaging a pair of first receiving means provided by a pair of spaced apart first receiving sockets 266 located in and beneath the rearward part 261 of the seat 260. A pair of second receiving means, namely, a pair of spaced apart second receiving sockets 268 are located on a support element 269 to the rear of the rearward part 261 of seat 260 for receiving the thigh support elements 264 in a second state, in other words, when not in use. When it is desired to stretch the quadriceps and hip flexor muscles of one of the thighs, the corresponding one of the thigh support elements 264 is disengaged from the first receiving sockets 266 and engaged in the second receiving sockets 268. When it is desired to stretch the quadriceps and hip flexor muscles of both thighs simultaneously, the two thigh support elements are disengaged from the first receiving sockets 266 and are engaged in the second receiving sockets 268. When it is desired to use the chair according to this embodiment of the invention as a conventional chair, the thigh support elements 264 are located in the first state engaged in the corresponding first receiving sockets 266. Additionally, when it is desired to stretch the adductor muscles, the thigh support elements 264 are located in the first state engaged in the corresponding first receiving sockets 266. It will be readily apparent to those skilled in the art that the seats of any of the embodiments of the invention which have been described may be interchanged with those of the chairs of other embodiments of the invention which have been described without departing from the scope of the invention.

Additionally, it will be appreciated that features of the different embodiments of the invention may also be interchangeable with features of others of the embodiments of the invention without departing from the scope of the invention.

While all the chairs according to the invention have been described as being substantially similar to the chair 1 described with reference to Figs. 1 to 33, and thus would all be provided with foot support means, it will be appreciated that in some cases the chairs may be provided without foot support means or with only one foot support means, needless to say other suitable foot support means could be provided.

It is envisaged that the carrier element which carries the foot support elements as well as being pivotal about the transverse pivot axis defined by the transverse pivot shaft 86, the carrier element may also be pivotal about a substantially vertically extending axis which would result in one of the foot support elements being urged forwardly relative to the seat, and the other being urged rearwardly relative to the seat. It will of course be appreciated that while the carrier element has been described as being pivotally mounted about the transverse pivot axis, while this is desirable, it is not essential, and it is also envisaged that the carrier element may be pivotally mounted solely about a vertical pivot axis.

It is also envisaged that the seat together with the thigh support elements may be pivotal about a vertical pivot axis, either along with or independently of pivoting of the carrier element about the vertical pivot axis. Indeed, it is envisaged that the seat together with the thigh support elements may be pivotal about respective vertical pivot axes without the carrier element for the foot support elements being pivotal about a vertical pivot axis, and vice versa. Further, it is envisaged that the main seat element may be pivotal about a vertical pivot axis independently of the thigh support elements, and in other cases, it is envisaged that the seat plate would be pivotal about a vertically extending pivot axis. Further, it is envisaged that the arm rests may be pivotal in a horizontal plane about a vertical pivot axis, and it is also envisaged that the back support member may be pivotal about a vertical pivot axis, and in which case the vertical pivot axis about which the arm rests and the back support member are pivotal would be a common vertical pivot axis. It is also envisaged that the seat, the carrier element, the arm rests, the back support member, the seat plate, the main seat element and the thigh support elements may all be adjustable relative to each other and independently of each other about various pivot axes.

It will also be appreciated that the inner thigh engagement means may be pivotal or moveable downwardly as well as upwardly from the first state supporting the thigh.

While a specific hinging arrangement for pivoting the thigh support elements about the respective first pivot axes, any other suitable pivoting arrangement may be provided. For example, while specific hinges have been described with specific toggle latching mechanisms, any other suitable hinges or pivotal mountings may be provided. In fact, it is envisaged in some embodiments of the invention that friction hinges may be provided, and in other embodiments of the invention, it is envisaged that the hinge elements of each hinge instead of being secured together by a toggle latch, may be secured together by a pin engaging selectable transverse bore through one of the hinge elements and engaging a corresponding bore or bores, or a recess or recesses in a pivot shaft of the other hinge element.

While a specific central pod construction has been described with respect to the chair of Figs. 1 to 33, it will be readily apparent to those skilled in the art that any other suitable arrangement for mounting the seat on the ground engaging support may be provided. It is envisaged that in some cases instead of providing the central pod in the form of two telescoping elements, the central pod may be provided in the form of three telescoping elements or more, and in which case, each pair of telescoping elements would be urgeable relative to each other by a corresponding ram. Accordingly, in the case of a central pod with three telescoping elements, two rams typically, would be used. It is also envisaged that two pairs of telescoping elements each operated by separate rams may be provided whereby the two pairs of telescoping elements would be provided in series, so that the first lift of the seat to raise the seat to a first level would be provided by one of the rams extending one of the pairs of telescoping elements, and the lift to bring the seat to a further raised level would be achieved by operating the second ram to extend the second pair of telescoping elements.

While the first urging means for simultaneously urging the thigh support elements about the respective main pivot axes in the generally rearwardly direction from the normal state to the stretching state has been described as being provided by an hydraulic ram operating a gear rack and a pair of pinions, it will be readily apparent to those skilled in the art that any other suitable drive means may be provided. It will also be appreciated that any other suitable transmission means for transmitting drive from the hydraulic ram to the thigh support elements besides a rack and pinion transmission drive means may be provided. It will also be appreciated that other suitable shapes and constructions of gear racks and pinions may be provided. Needless to say, it will be appreciated that any other suitable means for controlling the hydraulic ram and for operating the quick release aspect of the hydraulic ram may be provided.

It will also be appreciated that any other suitable mounting arrangements for mounting the back support member which carries the back support 15 to the back support carrier may be provided. Indeed, it is envisaged that instead of providing the strut 77 for adjusting the angle of the back support member relative to the back support carrier member, it is envisaged that an adjustment mechanism may be incorporated in the pivoting mechanism, which would be accessible to a seated subject on the chair. It is also envisaged that the back support member 14 as well as or instead of being pivotally coupled to the back support carrier member may also be slideable upwardly and downwardly relative to the back support carrier member.

It is also envisaged that the foot support elements may be rotatably mounted about a transversely extending rotational axis on the carrier element so that they would rotate freely relative to the carrier element in order that as the carrier element and the foot support elements are being urged rearwardly, or indeed forwardly about the transverse pivot shaft 86, the foot support elements would pivot on the transverse rotational axes relative to the carrier element to avoid relative movement between the relevant foot support element and the instep or leg of the subject as the carrier element and the foot support elements are being pivoted rearwardly or forwardly about the transverse pivot shaft 86.

It is envisaged that any and all of the chairs described with reference to Figs. 1 to 61 may be provided with one or a pair of knee engaging and supporting elements, similar to the knee engaging and supporting elements described with reference to Figs. 53 and 54 as well as or instead of the foot support elements 13. It will also be appreciated that instead of a pair of knee engaging and supporting elements a single knee supporting element may be provided, which may or may not be moveably mounted for alternately engaging the respective knees of a subject. Similarly it is envisaged that a single foot support element may be provided instead of a pair thereof, and in which case the single foot support element would be moveably mounted for alternately engaging the respective feet of a subject.

Claims

1. A chair comprising a ground engaging support, a seat supported on the ground engaging support for supporting a subject seated thereon, at least one foot support means located on at least one side of the chair, and configured for supporting a corresponding foot or lower leg of a subject seated on the seat with the corresponding thigh of the subject extending generally downwardly towards the knee from the seat, and the corresponding lower leg of the subject extending in a generally rearwardly direction towards the foot support means for stretching the quadriceps and hip flexor muscles, the seat comprising a main seat element configured for supporting the buttocks of a seated subject, and at least one thigh support element operable in a first state for supporting at least one of the thighs of a subject seated on the seat, and a second state substantially clear of the said thigh permitting the subject to extend the thigh generally downwardly from the main seat element.

2. A chair as claimed in Claim 1 in which the main seat element comprises a rearward part for supporting the buttocks of the subject seated thereon, the rearward part of the main seat element extending between a rearward edge and a forward edge.

3. A chair as claimed in Claim 2 in which the thigh support element extends forwardly from the rearward part of the main seat element.

4. A chair as claimed in Claim 2 or 3 in which the thigh support element is located relative to the main seat element extending in a direction generally forwardly from the forward edge of the rearward part thereof.

5. A chair as claimed in any preceding claim in which the rearward part of the main seat element defines a central longitudinal seat axis extending in a generally forward, rearward direction relative to the front and back of the chair, the central longitudinal seat axis substantially bisecting the rearward part of the seat.

6. A chair as claimed in any preceding claim in which the main seat element comprises a forward part extending forwardly from the rearward part of the main seat element.

7. A chair as claimed in any preceding claim in which the forward part of the main seat element extends centrally from the rearward part of the main seat element and defines with the rearward part of the central longitudinal seat axis.

8. A chair as claimed in any preceding claim in which the central longitudinal seat axis bisects the forward part of the main seat element.

9. A chair as claimed in any preceding claim in which the forward part of the main seat element defines a pair of spaced apart side edges extending along the forward part on opposite sides of the central longitudinal seat axis, the side edges of the forward part of the seat element extending relative to the central longitudinal seat axis one of parallel to the central longitudinal seat axis and diverging rearwardly from the central longitudinal seat axis.

10. A chair as claimed in any preceding claim in which the respective side edges of the forward part of the main seat element extend at an angle relative to the central longitudinal seat axis not greater than 20°.

11. A chair as claimed in any preceding claim in which the respective side edges of the forward part of the main seat element extend at an angle relative to the central longitudinal seat axis not greater than 15°.

12. A chair as claimed in any preceding claim in which the respective side edges of the forward part of the main seat element extend at an angle relative to the central longitudinal seat axis not greater than 10°.

13. A chair as claimed in any preceding claim in which the respective side edges of the forward part of the main seat element extend at an angle relative to the central longitudinal seat axis not greater than

6°.

14. A chair as claimed in any preceding claim in which the respective side edges of the forward part of the main seat element extend at an angle of approximately 5.8° relative to the central longitudinal seat axis.

15. A chair as claimed in any preceding claim in which the thigh support element extends sidewardly from the corresponding side edge of the forward part of the seat.

16. A chair as claimed in any preceding claim in which the rearward part of the main seat element defines a central transverse seat axis extending transversely of the seat relative to the front and back of the chair, and substantially perpendicularly to the central longitudinal seat axis.

17. A chair as claimed in any preceding claim in which the forward edge of the rearward part of the main seat element extends relative to the central transverse seat axis one of parallel to the central transverse seat axis and diverging from the central transverse seat axis in a general direction towards the central longitudinal seat axis.

18. A chair as claimed in any preceding claim in which the forward edge of the rearward part of the main seat element diverges from the central transverse seat axis in the general direction towards the central longitudinal seat axis at an angle in the range of 0° to 10°.

19. A chair as claimed in any preceding claim in which the forward edge of the rearward part of the main seat element diverges from the central transverse seat axis in the general direction towards the central longitudinal seat axis at an angle of approximately 4°.

20. A chair as claimed in any preceding claim in which the thigh support element is urgeable from the first state to the second state about a corresponding first pivot axis.

21. A chair as claimed in Claim 20 in which the first pivot axis extends parallel to one of the central seat axis, and the adjacent side edge defined by the forward part of the main seat element.

22. A chair as claimed in Claim 21 in which the first pivot axis extends adjacent the corresponding side edge of the forward part of the main seat element.

23. A chair as claimed in any of Claims 1 to 20 in which the first pivot axis extends parallel to one of the central transverse seat axis and the adjacent forward edge of the rearward part of the main seat element.

24. A chair as claimed in Claim 23 in which the first pivot axis extends adjacent the corresponding forward edge of the rearward part of the main seat element.

25. A chair as claimed in any of Claims 20 to 24 in which the thigh support element is pivotal downwardly about the first pivot axis from the first state to the second state.

26. A chair as claimed in any of Claims 20 to 25 in which the thigh support element extends substantially horizontally in the first state.

27. A chair as claimed in any of Claims 20 to 26 in which the first pivot axis extends substantially horizontally.

28. A chair as claimed in any of Claims 20 to 27 in which a pair of thigh support elements are provided for supporting the respective thighs of a subject.

29. A chair as claimed in any of Claims 20 to 28 in which the thigh support elements are pivotal about the first pivot axes independently of each other.

30. A chair as claimed in any of Claims 1 to 19 in which the first thigh support is slideable from the first state to the second state.

31. A chair as claimed in any of Claims 1 to 19 in which each thigh support element is releasably located in the chair in the first state, and is removable from the chair.

32. A chair as claimed in Claim 31 in which each thigh support element is releasably engageable in the chair in the first state in a first receiving means.

33. A chair as claimed in Claim 31 or 32 in which a second receiving means is provided in the chair for receiving each thigh support element when the thigh support element is in the second state.

34. A chair as claimed in any preceding claim in which a single thigh support element is provided.

35. A chair as claimed in Claim 34 in which the single thigh support element is moveable from the first state to a third state for supporting both thighs of a seated subject simultaneously.

36. A chair as claimed in Claim 34 or 35 in which the single thigh support element is moveable from the second to the third state.

37. A chair as claimed in any of Claims 34 to 36 in which the single thigh support element is moveable from the first state to a fourth state with neither of the thighs of a seated subject supported.

38. A chair as claimed in any of Claims 34 to 37 in which the single thigh support element is slideable between the respective states.

39. A chair as claimed in any of Claims 34 to 38 in which the single thigh support element is pivotal about the first pivot axis.

40. A chair as claimed in Claim 39 in which the first pivot axis about which the single thigh support element is pivotal between the respective state extends substantially generally vertically.

41. A chair as claimed in Claim 39 or 40 in which the vertically extending first pivot axis is located to cut the central longitudinal seat axis.

42. A chair as claimed in any of Claims 34 to 41 in which the single thigh support element is moveable from the first state at a location to one side of the central longitudinal seat axis for supporting one of the thighs, to the second state at a location to the other side of the central longitudinal seat axis for supporting the other one of the thighs.

43. A chair as claimed in any of Claims 34 to 42 in which the single thigh support element comprises an arcuate element.

44. A chair as claimed in any of Claims 34 to 42 in which the single thigh support element comprises a rectangular element.

45. A chair as claimed in any of Claims 34 to 44 in which the single thigh support element is urgeable beneath the main seat element.

46. A chair as claimed in any preceding claim in which each thigh support element is slideable relative to the main seat element between the first state and the second state.

47. A chair as claimed in any preceding claim in which each thigh support element is slideable beneath the main seat element in one or both of the first and second states.

48. A chair as claimed in any preceding claim in which the seat comprises a pair of seat elements pivotal about one or a pair of respective first pivot axes extending parallel to the central longitudinal seat axis.

49. A chair as claimed in Claim 48 in which the or each first pivot axis coincides with the central longitudinal seat axis.

50. A chair as claimed in any preceding claim in which each thigh support element is hingedly coupled by a first hinge about the first pivot axis, the first hinge defining the first pivot axis and comprising first and second hinge members which are pivotally coupled by a pivot shaft fixedly extending from one of the first and second hinge members to the other one of the first and second hinge members and on which the said other one of the first and second hinge members is rotatably mounted.

51. A chair as claimed in Claim 50 in which the first and second hinge members of each first hinge terminate in respective co-operating abutment faces, the abutment faces being configured for selectively retaining the first and second hinge members in respective first and second states corresponding to the first and second states of the corresponding thigh support element, and in turn for selectively retaining the corresponding thigh support element in a selected one of the first and second states.

52. A chair as claimed in Claim 50 or 51 in which the abutment faces of the respective first and second hinge members of each first hinge are configured for selectively retaining the first and second hinge members in one or more selectable intermediate positions intermediate the first and second states for in turn retaining the corresponding thigh support element in selectable one or more intermediate positions between the respective first and second states of the corresponding thigh support element.

53. A chair as claimed in any of Claims 50 to 52 in which the first and second hinge members of each first hinge are resiliently urged apart for disengaging the respective abutment faces from each other for permitting pivotal movement of one of the first and second hinge members relative to the other, for in turn permitting pivoting of the corresponding thigh support element about the corresponding first pivot axis.

54. A chair as claimed in any of Claims 50 to 53 in which a retaining means is provided for retaining the first and second hinge members of each first hinge together with the abutment faces thereof abutting each other for retaining the hinge and in turn the corresponding thigh support elements in a selected one of the first and second states or a selected one of the one or more intermediate positions intermediate the first and second states.

55. A chair as claimed in Claim 54 in which the retaining means comprises a latch.

56. A chair as claimed in Claim 54 or 55 in which the retaining means comprises a toggle latch.

57. A chair as claimed in any of Claims 50 to 52 in which the first and second hinge members of each first hinge are resiliently urged into engagement with each other for retaining the corresponding abutment faces in abutting engagement with each other, and an urging means is provided for urging one of the first and second hinge members of each first hinge from the other one thereof, and in turn for urging the abutment faces apart to permit pivoting of the first and second hinge members relative to each other, and in turn to permit pivoting of the corresponding thigh support element about the corresponding first pivot axis.

58. A chair as claimed in Claim 57 in which the urging means comprises a latch.

59. A chair as claimed in Claim 57 or 58 in which the urging means comprises a toggle latch.

60. A chair as claimed in any preceding claim in which each thigh support element comprises an inner thigh engagement means operable between a first state engaging an inner portion of a corresponding one of the thighs of a seated subject, and a second state disengaged from the inner portion of the corresponding thigh of the seated subject.

61. A chair as claimed in Claim 60 in which each inner thigh engagement means is located adjacent the distal end of the corresponding thigh support element.

62. A chair as claimed in Claim 60 or 61 in which each inner thigh engagement means is pivotally coupled to the corresponding thigh support element about a second pivot axis and is pivotal about the second pivot axis between the first and second states thereof.

63. A chair as claimed in Claim 62 in which the second pivot axis is located adjacent an inner side portion of the corresponding thigh support element.

64. A chair as claimed in Claim 62 or 63 in which the second pivot axis is located adjacent an inner side edge of the corresponding thigh support element.

65. A chair as claimed in any of Claims 62 to 64 in which the second pivot axis extends parallel to the first pivot axis.

66. A chair as claimed in any of Claims 62 to 65 in which each inner thigh engagement means is pivotally coupled to the corresponding thigh support element by a second hinge defining the corresponding second pivot axis.

67. A chair as claimed in any of Claims 62 to 66 preceding claim in which each inner thigh engagement means is pivotally coupled to the corresponding thigh support element by a friction second hinge.

68. A chair as claimed in Claim 66 or 67 in which the second hinge is configured for releasably retaining the inner thigh engagement means in the second state thereof.

69. A chair as claimed in Claim 60 or 61 in which the inner thigh engagement means is slideable between the first and second states thereof.

70. A chair as claimed in Claim 69 in which the inner thigh engagement means is slideable between the first and second states thereof in a slot formed in the corresponding thigh support element.

71. A chair as claimed in any preceding claim in which each thigh support element is urgeable generally rearwardly about a substantially vertically extending main pivot axis from a normal state extending generally forwardly from the main seat element for supporting the corresponding thigh of a seated subject, to a stretching state with the thigh of the subject extending at an angle greater than 0° from the central longitudinal seat axis and diverging therefrom for stretching the adductor muscles of the seated subject.

72. A chair as claimed in Claim 71 in which each thigh support element is urgeable about the corresponding main pivot axis from the normal state into a plurality of stretching states.

73. A chair as claimed in Claim 71 or 72 in which each thigh support element is pivotal about the corresponding main pivot axis from the normal state to the stretching state through an angle of at least

30°.

74. A chair as claimed in any of Claims 71 to 73 in which each thigh support element is pivotal about the corresponding main pivot axis from the normal state to the stretching state through an angle of at least 45°.

75. A chair as claimed in any of Claims 71 to 74 in which each thigh support element is pivotal about the corresponding main pivot axis from the normal state to the stretching state through an angle of at least 60°.

76. A chair as claimed in any of Claims 71 to 75 in which each thigh support element is pivotal about the corresponding main pivot axis from the normal state to the stretching state through an angle of approximately 90°.

77. A chair as claimed in any of Claims 71 to 76 in which the respective thigh support elements are simultaneously pivotal about the respective main pivot axes from the normal state to the stretching state.

78. A chair as claimed in any of Claims 71 to 77 in which the thigh support elements are incrementally urgeable about the respective main pivot axes through incremental angles from the normal state to the stretching state.

79. A chair as claimed in any of Claims 71 to 78 in which the thigh support elements are manually urgeable about the respective main pivot axes from the normal state to the stretching state.

80. A chair as claimed in any of Claims 71 to 79 in which the thigh support elements are urgeable by a manually operated drive means from the normal state to the stretching state.

81. A chair as claimed in Claim 80 in which the manually operated drive means comprises a manually operated hydraulic ram.

82. A chair as claimed in Claim 80 or 81 in which the manually operated drive means comprises a quick release mechanism for facilitating manual return of the thigh support elements about the respective main pivot axes from the stretching state to the normal state.

83. A chair as claimed in any preceding claim in which the seat comprises a pair of buttock supporting elements for supporting the respective buttocks of a subject seated thereon.

84. A chair as claimed in Claim 83 in which each buttock supporting element of the seat is urgeable with the corresponding thigh support element as the thigh support element is being urged between the normal state and the stretching state.

85. A chair as claimed in Claim 83 or 84 in which each buttock supporting element is pivotal with the corresponding thigh support element about the corresponding main pivot axis as the thigh support element is being urged between the normal and stretching states.

86. A chair as claimed in any of Claims 83 to 85 in which each buttock supporting seat element of the pair thereof is provided with an inner thigh engagement element.

87. A chair as claimed in any of Claims 83 to 86 in which each inner thigh engagement element is rigidly secured to the corresponding buttock supporting element of the pair thereof.

88. A chair as claimed in any preceding claim in which each thigh support element is urgeable about the first pivot axis from the first state to a third state extending generally upwardly from the first axis thereof.

89. A chair as claimed in any preceding claim in which the seat comprises a single seat element urgeable from a first state supporting the buttocks and the right thigh of a seated subject with the left thigh unsupported, and a second state supporting the buttocks and the left thigh of the seated subject with the right thigh unsupported.

90. A chair as claimed in Claim 89 in which the single seat element is pivotal between the first and second states about a first pivot axis.

91. A chair as claimed in Claim 90 in which the first pivot axis extends substantially vertically.

92. A chair as claimed in any of Claims 89 to 91 in which the single seat element is of L-shape construction when viewed in plan.

93. A chair as claimed in any of Claims 89 to 92 in which the first pivot axis extends through the single seat element adjacent the junction of the respective inner edges of the shaped single seat element.

94. A chair as claimed in any preceding claim in which the at least one foot support means is carried on a carrier element.

95. A chair as claimed in Claim 94 in which the carrier element of the foot support means is carried on an upstanding member extending upwardly to the rear of the seat.

96. A chair as claimed in Claim 94 or 95 in which the carrier element of the foot support means extends above the seat.

97. A chair as claimed in any of Claims 94 to 96 in which the carrier element of the foot support means extends above and below the seat.

98. A chair as claimed in any of Claims 94 to 97 in which the carrier element is slideable upwardly and downwardly along the upstanding support member for adjusting the height of the foot support means relative to the seat.

99. A.chair as claimed in any of Claims 94 to 98 in which the carrier element is pivotally mounted for facilitating backward and forward pivoting of the foot support means relative to the seat.

100. A chair as claimed in any of Claims 94 to 99 in which a releasable locking means is provided for releasably locking the carrier element in a desired angular position with the foot support means in a desired position relative to the forward/rearward direction of the pivotal movement of the carrier element.

101. A chair as claimed in any of Claims 94 to 100 in which the carrier element extends from the ground engaging support.

102. A chair as claimed in any of Claims 94 to 101 in which the carrier element is adjustably coupled to the ground engaging support for facilitating varying the height of the foot support means relative to the height of the seat.

103. A chair as claimed in any of Claims 94 to 102 in which a pair of foot support means are provided extending sidewardly outwardly on respective opposite sides of the chair.

104. A chair comprising at least one thigh support element for supporting at least one of the thighs of a subject seated on the chair, the thigh support element being operable in a generally rearwardly direction from a normal state extending generally forwardly of the chair to a stretching state for stretching the adductor muscles of the seated subject.

105. A chair as claimed in Claim 104 in which a pair of thigh support elements are provided for supporting the respective thighs of a seated subject.

106. A chair as claimed in Claim 104 or 105 in which the chair comprises a seat.

107. A chair as claimed in Claim 106 in which the seat comprises a main seat element configured for supporting the buttocks of a seated subject.

108. A chair as claimed in Claim 107 in which the main seat element comprises a rearward part for supporting the buttocks of the subject seated thereon, the rearward part of the main seat element extending between a rearward edge and a forward edge.

109. A chair as claimed in Claim 107 or 108 in which each thigh support element in the normal state is located relative to the main seat element extending in a direction generally forwardly from the forward edge of the rearward part thereof.

110. A chair as claimed in any of Claims 107 to 109 in which the rearward part of the main seat element defines a central longitudinal seat axis extending in a generally forward, rearward direction relative to the front and back of the chair, the central longitudinal seat axis substantially bisecting the rearward part of the seat.

111. A chair as claimed in any of Claims 107 to 110 in which the rearward part of the main seat element defines a central transverse seat axis extending transversely of the seat relative to the front and back of the chair and substantially perpendicularly to the central longitudinal seat axis.

112. A chair as claimed in any of Claims 107 to 111 in which the forward edge of the rearward part of the main seat element extends relative to the central transverse seat axis one of parallel to the central transverse seat axis and diverging from the central transverse seat axis in a general direction towards the central longitudinal seat axis.

113. A chair as claimed in Claim 112 in which the forward edge of the rearward part of the main seat element diverges from the central transverse seat axis in a direction towards the central longitudinal seat axis at an angle in the range of 0° to 10°.

114. A chair as claimed in Claim 112 or 113 in which the forward edge of the rearward part of the main seat element diverges from the central transverse seat axis in a direction towards the central longitudinal seat axis at an angle of approximately 4°.

115. A chair as claimed in any of Claims 107 to 114 in which each thigh support element extends forwardly from the rearward part of the main seat element.

116. A chair as claimed in any of Claims 107 to 115 in which the main seat element comprises a forward part extending forwardly from the rearward part of the main seat element.

117. A chair as claimed in Claim 116 in which the forward part of the main seat element extends centrally from the rearward part of the main seat element.

118. A chair as claimed in Claim 116 or 117 in which the forward part of the main seat element defines a pair of spaced apart side edges extending on opposite sides of the central longitudinal seat axis.

119. A chair as claimed in Claim 118 in which the side edges of the forward part of the seat element extend relative to the central longitudinal seat axis one of parallel to the central longitudinal seat axis and diverging rearwardly relative to the central longitudinal seat axis.

120. A chair as claimed in Claim 118 or 119 in which the respective side edges of the forward part of the main seat element diverge rearwardly relative to the central longitudinal seat axis at an angle not greater than 20°.

121. A chair as claimed in any of Claims 118 to 120 in which the respective side edges of the forward part of the main seat element diverge rearwardly relative to the central longitudinal seat axis at an angle not greater than 15°.

122. A chair as claimed in any of Claims 118 to 121 in which the respective side edges of the forward part of the main seat element diverge rearwardly relative to the central longitudinal seat axis at an angle not greater than 10°.

123. A chair as claimed in any of Claims 118 to 122 in which the respective side edges of the forward part of the main seat element diverge rearwardly relative to the central longitudinal seat axis at an angle not greater than 6°.

124. A chair as claimed in any of Claims 118 to 123 in which the respective side edges of the forward part of the main seat element diverge rearwardly relative to the central longitudinal seat axis at an angle of approximately 5.8°.

125. A chair as claimed in any of Claims 118 to 124 in which each thigh support element extends sidewardly from the corresponding side edge of the forward part of the seat.

126. A chair as claimed in any of Claims 104 to 125 in which each thigh support element is urgeable in the generally rearwardly direction from the normal state about a substantially vertically extending main pivot axis.

127. A chair as claimed in any of Claims 104 to 126 in which each thigh support element is urgeable in the general rearwardly direction from the normal state to a stretching state with the thigh support element extending at an angle greater than zero from the central longitudinal seat axis and diverging therefrom.

128. A chair as claimed in any of Claims 104 to 127 in which each thigh support element is urgeable in the generally rearwardly direction from the normal state about the main pivot axis into a plurality of stretching states.

129. A chair as claimed in any of Claims 104 to 128 in which each thigh support element is pivotal about the main pivot axis from the normal state to the stretching state through an angle of at least 30°.

130. A chair as claimed in any of Claims 104 to 129 in which each thigh support element is pivotal about the main pivot axis from the normal state to the stretching state through an angle of at least 45°.

131. A chair as claimed in any of Claims 104 to 130 in which each thigh support element is pivotal about the main pivot axis from the normal state to the stretching state through an angle of at least 60°.

132. A chair as claimed in any of Claims 104 to 131 in which each thigh support element is pivotal about the main pivot axis from the normal state to the stretching state through an angle of approximately 90°.

133. A chair as claimed in any of Claims 104 to 132 in which the respective thigh support elements are simultaneously pivotal about the respective main pivot axes from the normal state to the stretching state.

134. A chair as claimed in any of Claims 104 to 133 in which the thigh support elements are urgeable simultaneously from the normal state in the generally rearwardly direction away from each other to the stretching state.

135. A chair as claimed in any of Claims 104 to 134 in which each thigh support element is incrementally urgeable about the corresponding main pivot axis from the normal state to the stretching state through a plurality of incremental angular positions.

136. A chair as claimed in any of Claims 104 to 135 in which each thigh support element is manually urgeable about the corresponding main pivot axis from the normal state to the stretching state.

137. A chair as claimed in any of Claims 104 to 136 in which each thigh support element is urgeable about the corresponding main pivot axis from the normal state to the stretching state by a drive means.

138. A chair as claimed in any of Claims 137 in which the drive means comprises an hydraulic ram.

139. A chair as claimed in Claim 137 or 138 in which the drive means is configured for retaining the thigh support elements in the stretching state.

1 0. A chair as claimed in any of Claims 137 to 139 in which the drive means comprises a quick release mechanism for facilitating manual return of the thigh support elements about the main pivot axis from the stretching state to the normal state.

141. A chair as claimed in any of Claims 104 to 140 in which each thigh support element is urgeable from a first state configured to support a corresponding thigh of a seated subject to a second state substantially clear of the corresponding thigh permitting a seated subject to extend the thigh generally downwardly from the main seat element.

142. A chair as claimed in Claim 141 in which each thigh support element is urgeable downwardly from the first state to the second state.

143. A chair as claimed in Claim 141 or 142 in which each thigh support element is urgeable from the first state to the second state about a corresponding first pivot axis.

144. A chair as claimed in Claim 143 in which each first pivot axis extends one of parallel to the central longitudinal seat axis, and parallel to the adjacent side edge defined by the forward part of the main seat element.

145. A chair as claimed in Claim 143 or 144 in which each first pivot axis extends adjacent the corresponding side edge of the forward part of the main seat element.

146. A chair as claimed in Claim 143 in which each pivot axis extends parallel to one of the central transverse seat axis and the forward edge of the rearward part of the main seat element.

1 7. A chair as claimed in Claim 146 in which each first pivot axis extends adjacent the forward edge of the rearward part of the main seat element.

148. A chair as claimed in any of Claims 143 to 147 in which the thigh support elements are pivotal about the first pivot axes independently of each other.

149. A chair as claimed in any of Claims 143 to 148 in which each thigh support element is hingedly coupled by a first hinge about the first pivot axis, the first hinge defining the first pivot axis and comprising first and second hinge members which are pivotally coupled by a pivot shaft fixedly extending from one of the first and second hinge members to the other one of the first and second hinge members and on which the said other one of the first and second hinge members is rotatably mounted.

150. A chair as claimed in Claim 149 in which the first and second hinge members of each first hinge terminate in respective co-operating abutment faces, the abutment faces being configured for selectively retaining the first and second hinge members in respective first and second states corresponding to the first and second states of the corresponding thigh support element, and in turn for selectively retaining the corresponding thigh support element in a selected one of the first and second states.

151. A chair as claimed in Claim 149 or 150 in which the abutment faces of the respective first and second hinge members of each first hinge are configured for selectively retaining the first and second hinge members in one or more selectable intermediate positions intermediate the first and second states for in turn retaining the corresponding thigh support element in selectable one or more intermediate positions between the respective first and second states of the corresponding thigh support element.

152. A chair as claimed in any of Claims 149 to 151 in which the first and second hinge members of each first hinge are resiliently urged apart for disengaging the respective abutment faces from each other for permitting pivotal movement of one of the first and second hinge members relative to the other, for in turn permitting pivoting of the corresponding thigh support element about the corresponding first pivot axis.

153. A chair as claimed in any of Claims 149 to 152 in which a retaining means is provided for retaining the first and second hinge members of each first hinge together with the abutment faces thereof abutting each other for retaining the hinge and in turn the corresponding thigh support elements in a selected one of the first and second states or a selected one of the one or more intermediate positions intermediate the first and second states.

154. A chair as claimed in Claim 153 in which the retaining means comprises a latch.

155. A chair as claimed in Claim 153 or 154 in which the retaining means comprises a toggle latch.

156. A chair as claimed in any of Claims 143 to 155 in which each thigh support element is urgeable about the first pivot axis from the first state to a third state extending generally upwardly from the first axis thereof.

157. A chair as claimed in any of Claims 104 to 156 in which the seat comprises a pair of buttock supporting elements for supporting the respective buttocks of a subject seated thereon.

158. A chair as claimed in Claim 157 in which each buttock supporting element of the seat is urgeable with the corresponding thigh support element as the thigh support element is being urged between the normal and stretching states.

159. A chair as claimed in any of Claims 157 or 158 in which each buttock supporting element is pivotal with the corresponding thigh support element about the corresponding main pivot axis as the thigh support element is being urged between the normal state and the stretching state.

160. A chair as claimed in any of Claims 156 to 159 in which each buttock supporting element of the pair thereof is provided with an inner thigh engagement element.

161. A chair as claimed in Claim 160 in which each inner thigh engagement element is rigidly secured to the corresponding buttock supporting element of the pair thereof.

162. A chair as claimed in any of Claims 157 to 161 in which the thigh support elements extend from the respective buttock supporting elements.

163. A chair as claimed in any of Claims 157 to 162 in which each thigh support element extends rigidly from the corresponding buttock supporting element.

164. A chair as claimed in any of Claims 104 to 163 in which each thigh support element comprises an inner thigh engagement means operable between a first state engaging an inner portion of a corresponding one of the thighs of a seated subject, and a second state disengaged from the inner portion of the corresponding thigh of the seated subject.

165. A chair as claimed in Claim 164 in which each inner thigh engagement means is located adjacent the distal end of the corresponding thigh support element.

166. A chair as claimed in Claim 164 or 165 in which each inner thigh engagement means is pivotally coupled to the corresponding thigh support element about a second pivot axis.

167. A chair as claimed in any of Claims 164 to 166 in which the second pivot axis is located adjacent an inner side portion of the corresponding thigh support element.

168. A chair as claimed in any of Claims 164 to 167 in which the inner thigh engagement means is pivotally coupled to the corresponding thigh support element.

169. A chair as claimed in any of Claims 164 to 168 in which the inner thigh support element is pivotally coupled to the corresponding thigh support element adjacent an inner side edge of the corresponding thigh support element.

170. A chair as claimed in any of Claims 164 to 169 in which each second pivot axis extends substantially parallel to the corresponding first pivot axis.

171. A chair as claimed in Claim 164 or 165 in which each inner thigh engagement means is slideable between the first and second states thereof.

172. A chair as claimed in Claim 171 in which each inner thigh engagement means is slideable between the first and second states thereof in a slot formed in the corresponding thigh support element.

173. A chair as claimed in any of Claims 104 to 172 in which at least one foot support means is located on at least one side of the chair configured for supporting a corresponding foot or lower leg of a subject seated on the seat with the corresponding thigh of the subject extending generally downwardly towards the knee from the seat, and the corresponding lower leg of the subject extending in a generally rearwardly direction towards the foot support means for stretching the quadriceps and the hip flexor muscles.

174. A chair as claimed in any of Claims 104 to 173 in which a ground engaging support is provided and the seat is supported on the ground engaging support.

175. A chair comprising a seat having a buttock supporting element and a single thigh support element.

176. A chair as claimed in Claim 175 in which the single thigh support element is urgeable from a first state supporting a right thigh of a seated subject with the left thigh of the seated subject unsupported, and a second state supporting the left thigh of the seated subject and the right thigh thereof unsupported.

177. A chair as claimed in Claim 175 or 176 in which the single thigh support element is configured for operating in a third state simultaneously supporting the respective thighs of the subject.

178. A chair as claimed in Claim 177 in which the single thigh support element is urgeable between the first state and the third state.

179. A chair as claimed in Claim 177 or 178 in which the single thigh support element is urgeable between the second state and the third state.

180. A chair as claimed in any of Claims 175 to 179 in which the single thigh support element is urgeable into a fourth state with neither of the thighs of a seated subject supported.

181. A chair as claimed in Claim 180 in which the single thigh support element is urgeable between the first state and the fourth state.

182. A chair as claimed in Claim 180 or 181 in which the single thigh support element is urgeable between the second state and the fourth state.

183. A chair as claimed in any of Claims 175 to 182 in which the single thigh support element is pivotal about the first pivot axis between the respective states thereof.

184. A chair as claimed in Claim 183 in which the first pivot axis extends substantially vertically.

185. A chair as claimed in any of Claims 175 to 182 in which the single thigh support element is slideable between the respective states thereof.

186. A chair as claimed in any of Claims 175 to 185 in which at least one foot support means is located on at least one side of the chair configured for supporting a corresponding foot or lower leg of a subject seated on the seat with the corresponding thigh of the subject extending generally downwardly towards the knee from the seat, and the corresponding lower leg of the subject extending in a generally rearwardly direction towards the foot support means for stretching the quadriceps and the hip flexor muscles.

187. A chair as claimed in any of Claims 175 to 186 in which a ground engaging support is provided and the seat is supported on the ground engaging support.

188. A chair comprising a single seat element urgeable from a first state supporting the buttocks and the right thigh of a seated subject with the left thigh unsupported, and a second state supporting the buttocks and the left thigh of the seated subjected with the right thigh unsupported.

189. A chair as claimed in Claim 188 in which the single seat element is of L-shape construction when viewed in plan, a first leg of the L-shape seat element supporting the buttocks of a seated subject and a second leg of the L-shape seat element supporting the right thigh of the seated subject when the seat element is in the first state, and the second leg of the seat element supporting the buttocks of the subject and the first leg of the seat element supporting the left thigh of the subject when the seat element is in the second state.

190. A chair as claimed in Claim 188 or 189 in which the single seat element is pivotal between the first and second states about a first pivot axis.

191 A chair as claimed in Claim 190 in which the first pivot axis extends substantially vertically.

192. A chair as claimed in Claim 190 or 191 in which the first pivot axis extends through the single seat element adjacent the junction of the respective inner edges of the shaped single seat element.

193. A chair as claimed in any of Claims 188 to 192 in which a pair of single seat elements are provided, the single seat elements being configured to be operable with one of the single seat elements in the first state simultaneously while the other one of the single seat elements is in the second state.

194. A chair as claimed in Claim 193 in which the respective single seat elements are simultaneously operable in the first state.

195. A chair as claimed in Claim 193 or 194 in which the respective single seat elements are simultaneously operable in the second state.

196. A chair comprising a pair of buttock supporting elements for supporting the respective buttocks of a seated subject, and a pair of thigh support elements extending from the respective buttock supporting elements, each buttock supporting element and the corresponding thigh support element are urgeable between a first state with the corresponding buttock and thigh supported by the buttock supporting element and the thigh support element, respectively, and a second state with the buttock supporting element and the thigh support element clear of the corresponding buttock and thigh with the

corresponding buttock and thigh unsupported.

197. A chair as claimed in Claim 196 in which each thigh support element extends rigidly forwardly from the corresponding buttock supporting element.

198. A chair as claimed in Claim 196 or 197 in which each buttock supporting element and the corresponding thigh support element are slideable between the first and second states.

199. A chair as claimed in Claim 196 or 197 in which each buttock supporting element and the corresponding thigh support element are pivotal about a first pivot axis between the first and second state.

200. A chair as claimed in Claim 199 in which the or each first pivot axis extends substantially horizontally.

201. A chair as claimed in Claim 199 or 200 in which the first pivot axis extends in a generally forwardly rearwardly direction.

202. A chair as claimed in any of Claims 196 to 201 in which at least one foot support means is

5 located on at least one side of the chair configured for supporting a corresponding foot or lower leg of a subject seated on the chair with the corresponding thigh of the subject extending generally downwardly towards the knee from the seat, and the corresponding lower leg of the subject extending in a generally rearwardly direction towards the foot support means for stretching the quadriceps and the hip flexor muscles.

o

203. A chair as claimed in any of Claims 196 to 202 in which a ground engaging support is provided and the buttock supporting elements are supported on the ground engaging support. 5