GB2509549A

GB2509549A - Seat adjustment apparatus comprising a four bar link

Info

Publication number: GB2509549A
Application number: GB1300286.0A
Authority: GB
Inventors: Andrew Chatwin
Original assignee: Jaguar Land Rover Ltd
Current assignee: Jaguar Land Rover Ltd
Priority date: 2013-01-08
Filing date: 2013-01-08
Publication date: 2014-07-09
Anticipated expiration: 2033-01-08
Also published as: GB2509549B; GB201300286D0

Abstract

A seat adjustment apparatus for a vehicle seat. The apparatus includes a pivoting frame assembly. The pivoting frame assembly includes at least one first pivot member 19, at least one second pivot member 21. At least one floating link 17 is provided to connect the pivot members 19, 21 in the pivot frame assembly. An actuating means 75 is provided for controllably adjusting the configuration of the pivoting frame assembly. The actuating means 75 drivingly connects the at least one floating link 17 to the at least one first pivot member 19 is fixedly mounted to the at least one floating link 17. The seat adjustment apparatus can adjust the rise height of the vehicle seat and/or an angular orientation of a backrest (79, Figure 6). Optionally the actuating means 75 may be a linear actuating means or a rotary actuating means which may be rotatable about the pivot axis of the pivoting frame. Also claimed is a vehicle seat comprising first and second substantially parallel rails.

Description

SEAT ADJUSTMENT APPARATUS

TECHNICAL FIELD

The present invention relates to a seat adjustment apparatus and particularly, but not exclusively, to a seat adjustment apparatus for a vehicle. Aspects of the invention relate to a seat for a vehicle; a combined seat adjustment apparatus; and a vehicle.

BACKGROUND

A vehicle seat typically includes a seat adjustment apparatus to enable the seat to be adjusted to suit an individual. The seat adjustment apparatus can provide several degrees of freedom, for example seat position, rise height and backrest incline. The seat adjustment apparatus typically comprises a floating frame assembly mounted to a rail assembly. An actuator is provided to adjust the rise height of the seat by raising and lowering the floating frame. The height rise actuator is disposed beneath the floating frame and is usually coupled to the rail assembly. However, this arrangement reduces the available space beneath the seat adjustment apparatus and can limit the available range of motion. A separate actuator is provided for controlling the backrest incline and this typically comprises a rotary actuator.

The backrest actuator is often provided at the base of the backrest and may impinge into a rear foot well. This can prove particularly problematic in a three door vehicle having a back seat (for example a 2+2 configuration) in which rear space is limited and entry to and egress from the back seat is past the seat.

There are several shortcomings associated with current seat adjustment apparatus. The present invention, at least in certain embodiments, sets out to overcome or ameliorate at least some of these shortcomings.

SUMMARY OF THE INVENTION

Aspects of the present invention relate to a seat adjustment apparatus; a seat for a vehicle; a combined seat adjustment apparatus; and a vehicle.

In a further aspect of the present invention there is provided a seat adjustment apparatus for a vehicle seat, the apparatus comprising: a pivoting frame assembly comprising: at least one first pivot member; at least one second pivot member; and at least one floating link connecting said at least one first pivot member to said at least one second pivot member; actuating means for controllably adjusting the configuration of the pivoting frame assembly, wherein the actuating means drivingly connects said at least one floating link to said at least one first pivot member. By drivingly connecting said at least one floating link to said at least one first pivot member, the actuating means can be moved away from the area under the seat to create additional space. This can provide additional foot room for occupants in a second (or third) row of seats. In some embodiments, this additional space can permit an increased range of travel of the seat adjusting apparatus. The actuating means can be fixedly mounted to the at least one floating link.

The actuating means can be configured to apply a tangential force offset from a pivot axis of said pivoting frame assembly. For example, the actuating means can apply a force offset from a pivot axis of said at least one first pivot member and said at least one floating link.

The applied force can comprise a tangential component to affect pivoting about the related pivot axis. In this configuration, the actuating means can apply torque about the pivot axis of the floating link and the at least one first pivot member to adjust their relative angular orientation, thereby altering the configuration of the pivoting frame assembly. The actuating means can thereby adjust the geometry of the seat adjustment apparatus, for example to adjust a rise height of the seat.

The at least one first pivot member can be provided at the front of the seat adjustment apparatus and the at least one second pivot member can be provided at the back of the seat adjustment apparatus. This arrangement can enable positioning of the actuating means away from the rear of the seat adjustment apparatus. At least in certain embodiments, this can provide additional space behind the seat. In an alternate arrangement, the at least one first pivot member can be provided at the back of the seat adjustment apparatus and the at least one second pivot member provided at the front of the seat adjustment apparatus.

The pivoting frame assembly can be mounted to first and second rails. The at least one first pivot member and the at least one second pivot member can be pivotally mounted between said first and second rails. The first and second rails can be fixedly or movably mounted. For example, the rails could be slidably mounted to respective fixed rails provided on a vehicle floor. The first and second pivot members can be mounted to an inside of the rails to facilitate an increased range of movement.

The at least one first pivot member and/or the at least one second pivot member can comprise at least one mounting bracket pivotally coupled to said first and second rails; and at least one support bracket pivotally coupled to said at least one floating link. The at least one mounting bracket and the at least one support bracket can be mounted to a cross member, such as a transverse tube, having a longitudinal axis. The at least one mounting bracket can be angularly offset from said at least one support bracket. The angular offset can be about said longitudinal axis of the cross member. This arrangement can permit the at least one first pivot member and/or the at least one second pivot member to accommodate a larger range of motion of the at least one floating link. The at least one mounting bracket can be spatially offset from the at least one support bracket along the longitudinal axis of the cross member. For example, one of said mounting brackets can be provided at each end of said cross member and said at least one support bracket can be inset from the ends of the cross member. The position of said at least one support bracket on the cross member; and/or the length of the cross member can be altered for different applications. Thus, the seat adjustment apparatus can be modified for different seat configurations. In one arrangement, the first and second pivot members each comprise a cross member having a mounting bracket disposed at each end and a support bracket inset from each end. The seat adjustment apparatus could comprise two first pivot members and two second pivot members such that separate first and second pivot members are provided on each side.

The at least one floating link could be in the form of a plate or member. Alternatively, the at least one floating link can form a floating assembly, for example comprising lateral members.

Alternatively, the floating link can comprise a transfer arm or strut. To provide a further degree of freedom for the seat adjustment apparatus, the length of the or each floating link could be adjustable. For example, a length-adjusting actuator could be disposed in the floating link. The length adjusting actuator could, for example, be operated to adjust an incline angle of a seat backrest or of a seat squab.

The actuating means can be driven by one or more electric machines. Alternatively, or in addition, the actuating means can comprise a manual drive, such as a manually operated knob or lever.

The actuating means can comprise a linear actuator. For example, the linear actuator can comprise a spindle drive or a lead screw. The linear actuator can be drivingly connected to an actuating arm coupled to said at least one first pivot member. The actuating arm can be offset from the pivot axis of the first pivot member and the floating chassis member. The linear actuator can comprise a first electric machine.

Alternatively, the actuating means can comprise a rotary actuator. The rotary actuator can comprise a toothed drive gear coupled to a cooperating drive member. The toothed drive gear can be coupled to the at least one floating link or the at least one first pivot member.

The drive member is coupled to the other of said at least one floating link and the at least one first pivot member. A drive shaft can apply a turning force to rotate the drive gear. A second electric machine can be provided to drive said drive shaft. The drive shaft can extend transversely. The second electric machine can be disposed at the front of the seat adjustment appalatus, for example in a cential location.

The seat adjustment apparatus can be configured to adjust a rise height of the at least one floating link. By altering the geometry of the pivoting frame assembly, the at least one floating link can be raised and lowered. The at least one floating link can be a floating member or a floating chassis, as described herein. The first and second pivot members can be substantially the same length to maintain the orientation of the at least one floating link substantially uniform. Alternatively, the seat adjustment apparatus can be configured to adjust an angular orientation of said at least one floating link. A separate actuator could be provided for controlling the effective length or the position of a pivot axis of the pivoting frame assembly. The first and second pivot members could have different effective lengths to adjust the orientation of the floating link. In side elevation, the pivoting frame assembly can form an equal or unequal length quadrilateral. In other words, the effective length of the first and second pivot members can be the same or different.

The at least one second pivot member can be defined by or form part of a seat backrest. For example, the at least one second pivot member could be defined by a lower section of the seat backrest. Alternatively, the at least one second pivot member could be coupled to the seat backrest, for example by one or more links. In these arrangements, the seat adjustment apparatus could be configured to adjust an incline angle of the backrest. The at least one floating link can be a transfer arm, as described herein.

In a further aspect of the present invention there is provided apparatus comprising a first seat adjustment apparatus for adjusting a rise height of a seat as described herein; and a second seat adjustment apparatus for adjusting an incline angle of a seat backrest as described herein. The second seat adjustment apparatus can be mounted to the first seat adjustment apparatus.

In a still further aspect of the present invention there is provided a seat comprising a seat adjustment apparatus as described herein.

In a yet further aspect of the present invention there is provided a vehicle comprising a seat adjustment apparatus as described herein; or a seat as described herein.

In a further aspect of the present invention there is provided a seat adjustment apparatus for a vehicle seat, the apparatus comprising: a first pivoting frame assembly for adjusting a rise height of the seat; and a second pivoting frame assembly for adjusting an incline angle of a seat backrest; the first pivoting frame assembly comprising: at least one first pivot member; at least one second pivot member; and at least one first floating link connecting the first and second pivot members; first actuating means for controllably adjusting the configuration of the first pivoting frame assembly, the second pivoting frame assembly comprising: at least one third pivot member; at least one fourth pivot member; and at least one second floating link connecting the third and fourth pivot members; second actuating means for controllably adjusting the configuration of the second pivoting frame assembly, wherein the second pivoting frame assembly is mounted to the first pivoting frame assembly.

The at least one third pivot member and the at least one fourth pivot member could be pivotally mounted to the at least one first floating link. Alternatively, the at least one third pivot member and the at least one fourth pivot member can be pivotally mounted to the at least one first pivot member and the at least one second pivot member respectively. The at least one first pivot member and the at least one second pivot member can be pivotally connected to the at least one first floating link at first and second pivot axes. The at least one third pivot member and the at least one fourth pivot member can be arranged to pivot about said first and second pivot axes respectively.

The first actuating means can comprise a linear actuator or a rotary actuator. The first actuating means can drivingly connect the first floating link to either said first pivot member or said second pivot member. The second actuating means can comprise a linear actuator or a rotary actuator. The second actuating means can drivingly connect the second floating link to either said third pivot member or said fourth pivot member.

In a still further aspect of the present invention there is provided a seat adjustment apparatus for a vehicle seat, the apparatus comprising: a first link and a second link; a floating link pivotally coupled to the first and second links; and actuating means for controllably adjusting the angular orientation of said first link relative to the floating link; wherein the actuating means is configured to apply a tangential force offset from a pivot axis of said first link and said floating link.

According to a further aspect of the present invention, there is provided a vehicle seat chassis comprising: a first rail and a second rail arranged substantially parallel to each other; a first pivot member and a second pivot member; and a floating link connecting the first and second pivot members; the first pivot member comprising: a first cross member having a first longitudinal axis; one or more first mounting brackets pivotally mounting the first cross member to the first and second rails, the one or more first mounting brackets defining a first pivot axis about which the first cross member pivots; and one or more first support brackets pivotally mounting the floating link to the first cross member, the one or more first support brackets defining a second pivot axis about which the floating link pivots; wherein the first longitudinal axis, the first pivot axis and the second pivot axis are arranged substantially parallel to and offset from each other. The configuration of the first cross member provides an adaptable vehicle seat chassis which can be reconfigured for different applications, for example for use in different motor vehicles and to accommodate different sizes of vehicle seats. The offset arrangement of the first and second pivot axis in relation to the first longitudinal axes can reduce the packaging requirements, thereby reducing the space occupied by the vehicle seat chassis and, at least in certain embodiments, increasing the range of movement. The vehicle seat chassis described herein could be employed in a height rise mechanism and/or a backrest incline adjustment apparatus.

The one or more first mounting brackets can be angularly and/or laterally offset from said one or more first support brackets. The angular offset of the one or more first mounting brackets and said one or more first support brackets can position the first cross member so as to avoid fouling with other components. The lateral offset between said one or more first mounting brackets and said one or more first support brackets can provide increased design flexibility, for example to accommodate different sizes of vehicle seats.

The vehicle seat chassis can coniplise two of said first mounting brackets. The first cross member can have one of said first and mounting brackets disposed at each end thereof. The one or more first support brackets can be disposed on the first cross member between said first mounting brackets. Thus, the one or more first support brackets can be inset from said first mounting brackets.

The first cross member can comprise a first tubular member. The first mounting bracket(s) and/or the first support bracket(s) can be fixedly mounted to said first tubular member.

Alternatively, the first mounting bracket(s) and/or the first support bracket(s) can be formed integrally with the first cross member. For example, the first pivot member could be machined, cast or moulded. The first pivot member could be formed from a metal, such as steel or aluminium.

The second pivot member can comprise: a second cross member having a second longitudinal axis; one or more second mounting brackets pivotally mounting the second cross member to the first and second rails, the one or more second mounting brackets defining a third pivot axis about which the second cross member pivots; and one or more second support brackets pivotally mounting the floating link to the first cross member, the one or more second support brackets defining a fourth pivot axis about which the floating link pivots; wherein the second longitudinal axis, the third pivot axis and the fourth pivot axis are arranged substantially parallel to and offset from each other.

The one or more second mounting brackets can be angularly and/or laterally offset from said one or more second support brackets. The angular offset of the one or more second mounting brackets and said one or more second support brackets can position the second cross member so as to avoid fouling with other components. The lateral offset between said one or more second mounting brackets and said one or more second support brackets can provide increased design flexibility, for example to accommodate different sizes of vehicle seats.

The vehicle seat chassis can comprise two of said second mounting brackets. The second cross member can have one of said second mounting brackets disposed at each end thereof. The one or more second support brackets can be disposed on the second cross member between said second mounting brackets. Thus, the one or more second support brackets can be inset from said second mounting brackets.

The second cross member can comprise a second tubular member. The second mounting bracket(s) and/or the second support bracket(s) can be fixedly mounted to said second tubular member. The second mounting bracket(s) and/or the second support bracket(s) can be formed integrally with the second cross member. For example, the second pivot member could be machined or cast.

The longitudinal axes of the first and second cross members can be arranged substantially parallel to each other. Similarly, the first and second longitudinal axes of the cross members can be arranged substantially parallel to each other.

The first and second rails can be configured to be slidably mounted. For example, in use, the first and second rails can be slidably mounted to fixed rails on the floor of the vehicle. The position of the vehicle seat within the vehicle can thereby be changed in conventional manner.

According to a still further aspect of the present invention, there is provided a vehicle seat incorporating a vehicle seat chassis as described herein.

According to a yet further aspect of the present invention, there is provided a vehicle having a vehicle seat chassis as described herein.

According to a still further aspect of the present invention, there is provided a first pivot member for a vehicle seat, the first pivot member comprising: a first cross member having a first longitudinal axis; one or more first mounting brackets pivotally mounting the first cross member to the first and second rails, the one or more first mounting brackets defining a first pivot axis about which the first cross member pivots; and one or more first support brackets pivotally mounting the floating link to the first cross member, the one or more first support brackets defining a second pivot axis about which the floating link pivots; wherein the first longitudinal axis, the first pivot axis and the second pivot axis are arranged substantially parallel to and offset from each other.

According to a further aspect of the present invention there is provided an incline adjustment apparatus for a vehicle seat, the apparatus comprising: a pivoting frame assembly comprising: at least one front pivot member; a pivotally mounted backrest; and at least one floating link connecting the at least one front pivot member to the backrest; wherein the apparatus comprises actuating means for controllably adjusting the configuration of the pivoting frame assembly to adjust the angular incline of the backrest.

The pivoting frame assembly enables the angular incline of the backrest to be adjusted by controlling the positioning of the at least one floating link. Advantageously, the actuating means can be positioned remotely from the base of the backrest, thereby reducing packaging requirements. At least in certain embodiments, additional space can be created at the base of the vehicle seat. This is desirable to provide additional foot room for occupants seated behind the vehicle seat, for example in second and third rows of a vehicle.

The at least one floating link can be in the form of a transfer arm or a transfer assembly.

In use, displacing the at least one floating link in a rearward direction increases the incline angle of the backrest. In use, displacing the at least one floating link in a forward direction reduces the incline angle of the backrest. At least in certain embodiments, the continued movement of the floating link in a forward direction can pivot the backrest forwards, for example to provide additional access to the rear of the vehicle.

The pivoting frame assembly forms an adjustable geometry parallelogram. The pivoting frame assembly could comprise a single front pivot member or a pair of said front pivot members arranged substantially parallel to each other. Equally, a single floating link could be provided. Alternatively, the pivoting frame assembly can comprise a pair of said floating links. The floating links can be in the form of transfer arms or struts and can be arranged on respective sides of the incline adjustment apparatus.

The actuating means can be configured to adjust the angular orientation of said at least one front pivot member, the backrest and the at least one floating link. The relative position of the at least one floating link can thereby be adjusted to control the incline angle of the backrest. The actuating means can be selectively disengaged to allow the backrest to pivot freely. For example, in a three door vehicle the actuating means could be disengaged to provide improved access for the rear of the vehicle cabin. A disengaging member, such as a lever or a button, can be provided for selectively disengaging the actuating means.

The backrest is positioned at the back of the incline adjustment apparatus. The at least one front pivot member can be disposed in front of the backrest. At least in certain embodiments, the at least one front pivot member can be disposed at the front of the incline adjustment apparatus. The at least one floating link provides a connection between the at least one front pivot member and the backrest. The at least one floating link can extend from the front to the back of the incline adjustment apparatus. Advantageously, the actuating means can be coupled to said at least one front pivot member and/or the at least one floating link. Thus, the actuating means can be located remote from the backrest. For example, the actuating means can be positioned at the front of the vehicle seat. The actuating means could be mounted to at least one of said floating links or to said at least one front pivot member. The actuating means can be mounted in a central position, for example disposed between first and second said floating links.

The actuating means could be arranged to apply a linear force directly through a pivot axis of said pivoting frame assembly, for example through a pivot axis of said at least one front pivot member and said at least one floating link. Alternatively, the actuating means can be configured to apply a tangential force offset from a pivot axis of said pivoting frame assembly, for example offset from a pivot axis of said at least one front pivot member and said at least one floating link.

The actuating means could be operated manually, for example by a lever or a rotary knob.

Alternatively, the actuating means can comprise a drive motor, such as an electric motor.

The actuating means can comprise a linear actuator, for example a spindle drive.

Alternatively, the actuating means can comprise a rotary actuator. The rotary actuator can comprise a drive gear rotatable about a pivot axis formed by said at least one front pivot member and said at least one floating link. A transverse drive shaft can be provided to couple the drive motor to the drive gear. This arrangement allows the drive motor to be positioned centrally. The actuating means can comprise a single actuator or more than one actuator. For example, first and second actuators could be provided, the first and second actuators being disposed on respective sides of the seat.

The at least one front pivot member and the backrest can be pivotally mounted to a support platform. The support member could be fixedly mounted, for example to a floor of the vehicle. Alternatively, the support member can be movably mounted, for example to a rise height adjustment apparatus. In a further alternative, the at least one front pivot member and the backrest can be pivotally mounted to movable rails, for example to allow the vehicle seat to move forwards and backwards.

The incline adjustment apparatus can comprise a seat pan assembly. In the assembled vehicle seat, the seat cushion is supported by the seat pan assembly. The actuating means can be mounted to the seat pan assembly, for example in a front centre position. The seat pan assembly can comprise a pressed panel or a frame assembly. In the assembled vehicle seat, the actuating means can be embedded in seat cushioning material.

The seat pan assembly can be mounted to the support platform. The seat pan assembly can be partially or completely supported by said at least one floating link. For example, first and second said floating links can be arranged to provide lateral support for the seat pan assembly. In arrangements in which the seat pan assembly is supported by said at least one floating link, the position and/or profile of the seat pan assembly can change depending on the position of said at least one floating link. At least in certain embodiments, the height of the at least one floating link can be lowered as it travels in a rearward direction. The orientation of the at least one floating link may also change as it travels in a rearward direction. The position and/or orientation of the seat pan assembly can thereby be changed in conjunction with changes in the incline angle of the backrest. This functionality is advantageous as seat occupants wishing to create additional headroom often increase the incline angle of the backrest. The change in height and/or orientation of the at least one floating link can result from the mounting arrangement of the incline adjustment apparatus.

Alternatively, the height and/or orientation of the at least one floating link can change based on the relative offset between the pivot axes of said at least one front pivot member and of the backrest. For example, if the distance between the pivot axes of the backrest is greater than the distance between the pivot axes of the at least one front pivot member, the angular orientation of the at least one floating link will vary in dependence on the actuating means.

According to a still further aspect of the present invention, there is provided an incline adjustment apparatus for a vehicle seat, the apparatus comprising: a backrest member pivotable about a first axis; at least one transfer arm coupled to the backrest to pivot about a second axis; and actuating means drivingly coupled to the at least one transfer arm and operable to adjust the angular incline of the backrest member about said first axis. The first and second axes are offset from each other to enable the transfer arm to apply a pivoting force to the backrest member. This offset can also help distribute loading within the backrest member.

The backrest can be pivotally mounted to a chassis member, such as a floating member.

The height of the chassis member could be adjustable to adjust the rise height of the seat.

The chassis member, said at least one transfer arm and the backrest member can be arranged to form part or all of a pivoting frame assembly. When viewed in side elevation, the pivoting frame assembly can have a tiiangular, quadrilateial oi polygonal configuration.

In arrangements in which the pivoting frame has a triangular configuration, the at least one transfer arm can couple the backrest member directly to the chassis member. The actuating means can be configured to adjust the effective length of the at least one transfer arm. The actuating means can comprise a linear actuator, such as a spindle drive, operable to adjust the length of said at least one transfer arm. Alternatively, the actuating means can comprise a rotary actuator operable to adjust the angular orientation of two or more members forming said transfer arm.

In arrangements in which the pivoting frame has a quadrilateral configuration, the at least one transfer arm can be coupled to at least one pivot arm, The chassis member, the backrest member, the at least one transfer arm and the at least one pivot arm can form respective sides of the quadrilateral. The actuating means can be arranged to adjust the angular configuration of the pivoting frame. For example, the actuating means can drivingly couple the at least one transfer arm to either the at least one pivot arm or the backrest member. The actuating means can comprise a rotary actuator or a linear actuator.

The backrest member can comprise a seat spine of the type described herein.

A seat pan assembly can be mounted to said at least one transfer arm. The position and/or orientation of the seat pan assembly can vary depending on the position of said at least one transfer arm. Thus, the actuating means can be arranged to alter the position and/or orientation of the seat pan assembly conjunction with the incline angle of the backrest.

The backrest could form part of a backrest assembly, such as a ladder or picture frame assembly, for supporting the backrest of the vehicle seat. Alternatively, the backrest can be a central spine for supporting the backrest of the vehicle seat.

A further aspect of the present invention, there is provided a vehicle seat incorporating an incline adjustment apparatus of the type described herein.

In a still further aspect of the present invention, there is provided a vehicle incorporating one or more incline adjustment apparatus of the type described herein.

According to a further aspect of the present invention, there is provided a vehicle seat frame comprising a backrest and a chassis, the backrest comprising a central elongate spine. The spine is configured to be positioned adjacent to, or in proximity of the spine of a seat occupant. At least in certain embodiments, the spine disposed in the backrest can provide additional protection for the seat occupant. The spine is a structural element defining a central support structure for the backrest.

The spine can support additional components of the vehicle seat frame. For example, side bolsters and/or a headrest can be mounted to the spine. Indeed, the spine can optionally extend into the headrest portion of the vehicle seat frame. The spine can be a separate component integrated into the backrest.

The spine is operatively arranged vertically within the backrest. The spine can extend upwardly at least to a shoulder section of the backrest. The spine can provide support for a headrest within the backrest.

The spine can be pivotally mounted to the chassis to adjust the incline angle of the backrest.

In use, the spine can pivot relative to the chassis about a first pivot axis. The pivoting connection formed between the spine and the chassis can be a first free pivot (i.e. without a driving connection associated with the pivoting connection). An incline actuator means for adjusting the angular incline of the backrest can be disposed remotely from the pivoting connection between the spine and the seat pan. A coupling can be provided on the spine for connecting a transfer arm or a floating link to control the angular incline of the backrest. At least one floating link can be pivotally coupled to the spine. The incline actuator means can be a linear actuator or a rotary actuator, for example.

Alternatively, a driven pivot can be provided between the spine and the seat pan. For example, an incline actuator means, such as a rotary actuator, can be provided at said driven pivot for adjusting the angular incline of the backrest. The incline actuator means can be a rotary actuator coupled to said driven pivot.

The actuator means can be operated manually or automatically. For example, the actuator means can comprise a lever or rotary knob. Alternatively, the actuator means can comprise a mechanical or electric drive motor.

The chassis can be adapted to be slidably mounted to rails within a vehicle. The chassis can form a base of the vehicle seat (referred to as a seat squab). A seat pan can be mounted to the chassis to provide support.

The spine can comprise a conduit extending along part or all of its length. The conduit can extend vertically within the backrest. The conduit could be used to convey air within the vehicle cabin, for example from a climate control system. One or more air vents could be provided in the backrest to direct air within the cabin. For example, the air vents could be arranged to direct air onto the neck or shoulders of the seat occupant; and/or into the rear of the vehicle cabin. Alternatively, or in addition, the conduit could be used to carry electrical cables, for example to a display or audio system mounted to the vehicle seat. The spine can thereby provide a structural component within the seat frame whilst also improving packaging of ancillary components. The spine could have an open channel section.

Alternatively, the spine could have a closed box section.

The backrest can comprise a backrest assembly mounted to the spine. The backrest assembly can comprise a back support panel and optionally also two or more side bolsters.

A padding material, such as a foam material, can be provided on the back support panel and/or the side bolsters. A finishing material, such as a fabric or leather, can be provided over the padding material to form the outer surface of the seat. The backrest assembly can be fabricated independently of the spine and then be mounted thereto. Advantageously, this allows the seat frame to be installed in the vehicle before the backrest assembly is fitted.

This assembly technique is believed to be patentable independently.

According to a still further aspect of the present invention there is provided a method of assembling a vehicle seat comprising a backrest and a chassis, the method comprising mounting a prefabricated backrest support assembly to an elongated spine pivotally coupled to the chassis, the backrest support assembly comprising a back support panel and optionally also first and second side bolsters.

The spine can be formed from a composite material or metal. The spine could be an extruded section, a moulding or a formed component. Alternatively, the spine could be an assembly made up of a plurality of components.

The spine can comprise an external fixing point for mounting an article or component to an exterior of the vehicle seat frame. For example, a picnic table or the like could be pivotally mounted to the spine.

According to a still further aspect of the present invention, there is provided a vehicle seat incorporating a vehicle seat frame of the type described herein.

According to a yet further aspect of the present invention, there is provided a vehicle incorporating a vehicle seat frame of the type described herein. An air duct and/or an electric cable can be disposed within the spine.

According to a still further aspect of the present invention, there is provided a spine for a vehicle seat frame, the spine being configured for positioning centrally within a backrest of the vehicle seat frame. The spine is load-bearing and forms a structural component within the vehicle seat frame in use. The spine can have a closed section or an open section. The spine can be for a composite material, for example carbon fibres embedded in a resin.

Alternatively, the spine can be formed from metal, for example an aluminium or steel extrusion or casting.

The spine has an elongated profile and, in use, extends vertically within the backrest. The spine can have a curved profile along its length for substantially matching the profile of a seat occupant's spine. For example, the spine can comprise a convex section for providing lumbar support; and/or a concave section for providing shoulder support. The spine can have one or more mounts for mounting a bolster or lateral support. The one or more mounts can be disposed on respective sides of the spine.

The spine can comprise at least a first coupling for pivotally mounting the spine to a chassis.

The first coupling(s) can be disposed at the base of the spine. The first coupling(s) can define a first pivot axis. The first coupling(s) can comprise a male connector or a female connector for pivotally mounting the spine to the chassis. A suitable male connector is a pivot pin or an axle. A suitable female connector is an aperture, a bush or a bearing for receiving a pivot pin or an axle.

The spine can comprise at least one mounting lug for forming said first coupling(s). A pivot axle can extend transversely through each mounting lug. For example, first and second mounting lugs can be integrally formed at the base of the spine on each side thereof. A first concave recess can be formed in a front face of the spine between said first and second mounting lugs. In use, the first concave recess can accommodate a portion of a floating link when the backrest is pivoted forwards about said first coupling.

The spine can comprise at least a second coupling for pivotally connecting at least one floating link to the spine. The second coupling(s) can define a second pivot axis. The second coupling(s) can comprise a male connector or a female connector for pivotally mounting the spine to the chassis. A suitable male connector is a pivot pin or an axle. A suitable female connector is an aperture, a bush or a bearing for receiving a pivot pin or an axle.

The spine can comprise at least one lateral support for forming said second coupling(s). A pivot axle can extend transversely through each lateral support. For example, first and second lateral supports can be integrally formed in the spine on each side thereof. A second concave recess can be formed in a front face of the spine between said first and second lateral supports.

The at least one second coupling can be displaced from said at least one first coupling to spread operational loads applied to the spine. The first and second pivot axes can be arranged parallel to and offset from each other.

Within the scope of this application it is expressly envisaged that the various aspects, embodiments, examples and alternatives set out in the preceding paragraphs, in the claims and/or in the following description and drawings, and in particular the individual features thereof, may be taken independently or in any combination. Features described in connection with one embodiment are applicable to all embodiments, unless such features are incompatible.

BRIEF DESCRIPTION OF THE DRAWINGS

Embodiments of the present invention will now be described, by way of example only, with reference to the accompanying figures, in which: Figure 1 shows a longitudinal sectional view of a seat frame incorporating a seat adjustment mechanism in accordance with an embodiment of the present invention; Figure 2 shows a perspective view of the seat frame shown in Figure 1 with the seat base shown in phantom; Figures 3A and 3B show exploded perspective views of the seat frame shown in Figures 1 and 2; Figure 4 shows a perspective view of a height rise mechanism of the seat adjustment mechanism shown in Figure 1; Figure 5 shows a side elevation of the height rise mechanism shown in Figure 4; Figure 6 shows a perspective view of a backrest incline mechanism of the seat adjustment mechanism shown in Figure 1; Figure 7 shows a side elevation of the backrest incline mechanism of shown in Figure 6; Figure 8 shows a schematic representation of the pivot positions for the seat adjustment mechanism; Figures 9a, b and c show the height rise mechanism in respective nominal, maximum and minimum height positions; Figures ba, b and c show the incline mechanism in respective nominal, rearward and forward positions; Figure 11 shows a rear elevation of the seat frame shown in Figure 1; Figure 12 shows a rear perspective view of the backrest section of the seat frame; and Figure 13 shows an exploded view of the backrest shown in Figure 12.

DETAILED DESCRIPTION

A seat 1 incorporating a seat frame 2 in accordance with the present invention will now be described with reference to the accompanying Figures. A longitudinal sectional view of the seat 1 is shown in Figure 1. In the present embodiment, the seat 1 is an adjustable front seat of a motor vehicle (not shown), but aspects of the seat frame 2 can be implemented in other applications.

The seat frame 2 includes a height rise mechanism 3 and a backrest incline mechanism 5 for adjusting the position and orientation of a seat base 7 and a backrest 9. The seat frame 2 according to the present embodiment provides six (6) degrees of freedom, namely: the (longitudinal) position of the seat frame 2; the height rise (vertical position); and backrest inclination. The seat frame 2 could be modified to provide additional degrees of freedom, for example to allow independent adjustment of the angle of the seat base 7 and/or to provide adjustable lumbar support.

As shown in Figure 2, the seat base 7 comprises first and second rail brackets 11, 12 configured for slidably mounting the seat frame 2 to fixed rails 13, 14 provided on the floor of the vehicle. The seat base 7 is movably mounted on the fixed rails 13, 14 and a conventional locking mechanism (not shown) is provided for selectively locking the seat frame 2 in position.

The height rise mechanism 3 allows the rise height of the seat base 7 (i.e. the height of the seat base 7 relative to the floor of the vehicle) to be adjusted. The backrest incline mechanism 5 allows the angular orientation of the backrest 9 to be adjusted. The angular orientation of the backrest 9 is referred to herein as the incline angle, which can be positive (when the backrest 9 is reclined backwards) or negative (when the backrest 9 is inclined forwards, for example to improve access to the rear of the vehicle). The height rise mechanism 3 and the backrest incline mechanism 5 in the present embodiment can be operated at least substantially independently of each other.

With reference to Figures 3A, 3B, 4 and 5, the height rise mechanism 3 comprises a floating chassis 17, a front pivot member 19 and a rear pivot member 21. As shown in Figures 3A and 3B, the front pivot member 19 comprises first and second front mounting brackets 23, fixedly mounted to respective ends of a first tubular member 27. The first tubular member 27 extends transversely between the first and second rail brackets 11, 12. The first and second front mounting brackets 23, 25 each have a first aperture 29 for receiving a first pivot pin 31 to pivotally mount the front pivot member 19 to the first and second rail brackets 11, 12. The front pivot member 19 can thereby pivot relative to the first and second rail brackets 11, 12 about a first pivot axis A defined by said first pivot pins 31. The first pivot axis A is offset from a longitudinal axis of the first tubular member 27. The front pivot member 19 also comprises first and second front support brackets 33, 35 projecting upwardly from the first tubular member 27. The first and second front support brackets 33, 35 each carry a tubular collar 37, 39 arranged to receive a second pivot pin 41 for mounting the floating chassis 17.

The floating chassis 17 can pivot relative to the front pivot member 19 about a second pivot axis B defined by the second pivot pins 41. The second front support bracket 35 also comprises an actuating arm 43 extending upwardly beyond the pivot axis B. The rear pivot member 21 comprises first and second rear mounting brackets 45, 47 fixedly mounted to respective ends of a second tubular member 49. The first and second rear mounting brackets 45, 47 each have a third aperture 51 for receiving a third pivot pin 53 to pivotally mount the rear pivot member 21 to the first and second rail brackets 11, 12. The rear pivot member 21 can thereby pivot about a third pivot axis C defined by said third pivot pins 53. The third pivot axis C is offset from a longitudinal axis of the second tubular member 49. The rear pivot member 21 also comprises first and second rear support brackets 55, 57 projecting upwardly from the second tubular member 49. The first and second rear support brackets 55, 57 are C-shaped and are fixedly mounted to the second tubular member 49. A fourth aperture 59 is formed at the upper end of each of the first and second rear support brackets 55, 57 for receiving respective backrest pivot axles 63. The backrest pivot axles 63 are arranged to pivotally mount the backrest 9 and the floating chassis 17 to the first and second rear support brackets 55, 57. The floating chassis 17 and the rear pivot member 21 can pivot relative to each other about a fourth pivot axis D defined by said backrest pivot axles 63.

With reference to Figure 4, the floating chassis 17 in the present embodiment is an assembly comprising a mounting plate 65 and first and second floating links in the form of floating members 67, 69. The first and second floating members 67, 69 each have a front aperture 71 for receiving one of said second pivot pins 41 to pivotally mount the floating chassis 17 to the first and second front support brackets 33, 35. Similarly, the first and second floating members 67, 69 each have a rear aperture 73 for receiving said backrest pivot axles 63 to pivotally mount the floating chassis 17 to the first and second rear support brackets 55, 57.

In the present embodiment, the floating chassis 17 is a metal assembly in which the mounting plate 65 is welded to the first and second floating members 67, 69. It will be appreciated, however, that the floating chassis 17 could be formed from a composite material, such as carbon fibres embedded in a resin. The floating chassis 17 could have a unitary construction such that the first and second floating members 67, 69 are formed integrally.

A height rise actuator 75 is fixedly mounted to the first mounting plate 65. A drive rod 77 couples the height rise actuator 75 to the actuating arm 43 provided on the first front support bracket 31. Specifically, a clevis pin 61 disposed on the drive rod 77 locates in an actuator collar 80 mounted to the actuating arm 43. The height rise actuator 75 thereby provides a driving coupling between the floating chassis 17 and the first pivot member 19. The height rise actuator 75 comprises a first electric motor 78 coupled to a spindle drive 79 to provide a linear drive output. The height rise actuator 75 is operable to displace the drive rod 77 axially, thereby applying a force offset from the second pivot axis B. The applied force comprises a tangential component which applies a turning moment about the second pivot axis B which rotates the front pivot member 19 and the floating chassis 17 relative to each other. This angular change alters the geometry of the height rise mechanism 3, thereby changing the rise height of the floating chassis 17. Specifically, in the present embodiment the rise height of the floating chassis 17 is increased when the drive rod 77 is extended; and decreased when the drive rod 77 is retracted.

The height rise mechanism 3 described herein forms a four-bar linkage made up of the rail bracket 11, 19, the floating chassis 17 (comprising the mounting plate 65, and the first and second floating members 67, 69), the front pivot member 19 and the rear pivot member 21.

The first and third axes A, C define fixed pivots; and the second and fourth axes B, D define moving pivots. The offset between the first and second axes A, B is the same as the offset between the third and fourth axes C, D; and the offset between the first and third axes A, C is the same as the offset between the second and fourth axes B, D. Accordingly, the height rise mechanism 3 is in the form of a parallelogram linkage having opposite sides of equal length and adjacent sides of unequal length. This arrangement ensures that the angular orientation of the floating chassis 17 remains substantially uniform as it undergoes translation.

With reference to Figures 6 and 7, the backrest 9 comprises a spine 79 having a box section and integrated mounting lugs 81, 83 for mounting the spine 79 to the first and second rear support brackets 55, 57. The mounting lugs 81, 83 are sized to locate between the first and second floating members 67, 69 and the first and second rear support brackets 55, 57. The mounting lugs 81, 83 align with the fourth apertures 59 to receive the backrest pivot axles 63. The spine 79 can thereby pivot relative to the floating chassis 17 about the fourth axis D defined by the backrest pivot axles 63. One or more bushes could optionally be provided in the mounting lugs 81, 83 to support the backrest pivot axles 63.

A concave recess 85 is formed in a front surface of the spine 79, forming first and second lateral supports 87, 89. The first and second lateral supports 87, 89 are offset from the mounting lugs 81, 83 to spread operating loads applied to the backrest 9. In the present embodiment, the spine 79 is formed from a composite material, such as carbon fibres embedded in a resin. The spine 79 could alternatively be formed from metal, for example a pressed member (for example steel or aluminium) or a casting (for example steel, aluminium or magnesium).

The backrest incline mechanism 5 controls the angular orientation of the backrest 9 by controlling pivoting of the spine 79 about the fourth axis D. The backrest incline mechanism comprises a backrest actuator 93, a second electric motor 94, first and second transfer arms 95, 97 and first and second pivot arms 99, 101. The front pivot arms 99, 101 are pivotally mounted to the first and second front support brackets 33, 35 to pivot about the second axis B. The first and second transfer arms 95, 97 are coupled to the front pivot arms 99, 101 by respective first and second rotary actuators 103, 105 drivingly connected to the backrest actuator 93. The rotary actuators 103, 105 define a fifth pivot axis E about which the transfer arms 95, 97 and the pivot arms 99, 101 pivot relative to each other. The aft ends of the transfer arms 95, 97 are pivotally mounted to sixth pivot pins 107 supported in the lateral supports 87, 89. The sixth pivot pins 107 thereby define a sixth pivot axis F about which the transfer arms 95, 97 can pivot relative to the spine 79. A seat pan 110 (shown in section in Figure 1) is mounted to the transfer arms 95, 97 and, in the assembled seat, supports cushioning for the seat base 7. The seat pan 110 could optionally be formed integrally with the floating assembly 17, for example in a one-piece moulding or pressing.

The rotary actuators 103, 105 each comprise a main drive gear 111, 113 rotatable about the fifth pivot axis F. The main drive gears 111, 113 each have a splined hub 115, 117 and an outer toothed profile for engaging a complementary toothed member 119, 121 fixedly mounted to the front pivot arm 99, 101. The rotary actuators 103, 105 are operable to vary the included angle between the transfer arms 95, 97 and the front pivot arms 99, 101. The second electric motor 94 is coupled to a drive assembly 123 for drivingly rotating a transverse drive shaft 125. The drive shaft 125 is splined and drivingly engages the splined hubs 115, 117 of the respective articulation mechanisms 103, 105. The rotation of the drive gears 111, 113 transmits a tangential force to the toothed members 115, 117. The tangential force is offset from the fifth pivot axis F and the resultant turning moment rotates the transfer arms 95, 97 relative to the front pivot arms 99, 101.

The rotary actuators 103, 105 could optionally be configured to be selectively disengaged to allow the backrest 9 to be pivoted freely. An actuating member, such as a lever or a button, can be provided to disengage the rotary actuators 103, 105 to allow the backrest 9 to be pivoted. The actuating member can be operated to pivot the backrest 9 to provide improved access to the rear of the vehicle cabin.

The backrest actuator 93 can be operated to rotate the drive shaft 125 in a clockwise or counter-clockwise direction to increase or decrease the effective included angle between the transfer arms 95, 97 and the front pivot arms 99, 101. This change alters the geometry of the backrest incline mechanism 5, causing the spine 79 to pivot forwards or backwards about the fourth axis D. The transfer arms 95, 97 are laterally offset from the front pivot arms 99, 101 to avoid fouling when the spine 79 is pivoted forwards, thereby providing an increased articulation range. The backrest actuator 93 is centrally mounted in the front of the seat base 7, for example mounted to the seat pan 110. The position and orientation of the backrest actuator 93 is substantially unaffected by the change in the articulation angle of the transfer arms 95,97 and the front pivot arms 99, 101.

The backrest incline mechanism 5 described herein forms a four-bar linkage made up of the floating chassis 17, the transfer arms 95, 97, the front pivot arms 99, 101 and a lower portion of the spine 79. The second and fourth axes B, D define fixed pivots (at least when the height rise mechanism 3 is locked); and the fifth and sixth axes E, F define moving pivots.

The offset between the second and fifth axes B, E differs fiom the offset between the fouith and sixth axes D, F; and the offset between the second and fourth axes B, D differs from the offset between the fifth and sixth axes E, F. Accordingly, the backrest incline mechanism 5 is in the form of a parallelogram having sides of unequal length. This arrangement results in a small change in the angular orientation of the transfer arms 95, 97, and hence the seat pan 110, when the backrest actuator 93 is operated. The angular rotation and/or movement of the transfer arms 95, 97 can be altered by changing the relative positions of the second and fifth axes B, E and the fourth and sixth axes D, F. Thus, the backrest incline mechanism 5 described herein can readily be modified to suit different applications.

The height rise mechanism 3 and the incline mechanism 5 can be controlled by any suitable user interface. A control unit (not shown) can be provided for controlling operation of the first and second electric motors 78, 94. The control unit can comprise a storage module for storing user-defined pie-sets. An array of switches can be associated with each seat in the vehicle. Alternatively, the seat could be configured via a central console.

The relative movement of the height rise mechanism 3 and the incline mechanism 5 are illustrated schematically in Figure 8. Specifically, the relative positions of the pivot axes A-F are shown in a series of positions. The location of a seventh pivot axis 0 defined by the actuator collar 80 mounted to the actuating arm 43 is also shown in Figure 8 to illustrate the operation of the height rise actuator 75.

In use, the height rise of the floating chassis 17 is varied by operating the height rise actuator 75 to displace the drive rod 77 relative to the floating chassis 17. Extending the drive rod 77 decreases the included angle between the floating chassis 17 and the front pivot member 19, causing the floating chassis 17 to travel forwards and upwards as the front and rear pivot members 19, 21 pivot about the respective first and third pivot axes A, C in a counter-clockwise direction. Retracting the drive rod 77 increases the included angle between the floating chassis 17 and the front pivot member 19, causing the floating chassis 17 to travel backwards and downwards as the front and rear pivot members 19, 21 pivot about the respective first and third pivot axes A, C in a clockwise direction. The angular orientation of the floating chassis 17 remains substantially constant as it is undergoes translation.

The seat frame 2 is shown in a nominal (centre) height rise position in Figure 9a. In this position, the longitudinal axes of the first and second tubular members 27, 49 are positioned in a virtual plane defined by the first and third axes A, C. To increase the height of the seat frame 2, the height rise actuator 75 is operated to extend the drive rod 77, thereby raising the floating chassis 17 relative to the rail brackets 11, 12. The height rise mechanism 3 is shown in a maximum height position in Figure 9b. Conversely, to reduce the height of the seat frame 2, the height rise actuator 75 is operated to retract the drive rod 77, thereby lowering the floating chassis 17 relative to the rail brackets 11, 12. The first and second tubular members 27, 49 can pivot below the virtual plane defined by the first and third axes A, C, thereby lowering the minimum height of the floating chassis 17. The height rise mechanism 3 is shown in a minimum height position in Figure 9c.

The incline angle of the backrest 9 is controlled by operating the rotary actuators 103, 105 to alter the relative orientation of the transfer arms 95, 97 and the front pivot arms 99, 101. This changes the effective included angles between the second, fourth, fifth and sixth pivot axes B, D, E, F and alters the geometry of the backrest incline mechanism 5. Thus, the backrest actuator 93 can control the incline angle of the spine 79 about the fourth axis D. The backrest 9 is illustrated in a nominal (centre) position in Figure 1 Oa. To increase the incline angle of the spine 79, the backrest actuator 119 is operated to increase the angle between the transfer arms 95, 97 and the front pivot arms 99, 101. Conversely, to decrease the incline angle of the backrest 9, the backrest actuator 119 is operated to reduce the angle between the transfer arms 95, 97 and the front pivot arms 99, 101. The spine 79 can be pivoted to a forward inclined position to facilitate access to, or egress from the rear of the vehicle. The backrest 9 is shown in a maximum incline position in Figure lOb; and a maximum forward position in Figure bc. As outlined above, the transfer arms 95, 97 are disposed laterally outwardly of the front support brackets 33, 35 and the rear support brackets 55, 57 to enable a larger range of articulation angles, thereby increasing the extent to which the backrest 9 can be pivoted forwards.

When the first and second electric motors 94 are de-energized, the internal friction in the spindle drive and the drive gears lock the respective height rise and incline mechanisms 3, 5. The height rise mechanism 3 and the incline mechanism 5 described herein can be operated substantially independently of each other. For example, the height rise mechanism 3 can be operated whilst maintaining the angular orientation of the spine 79 substantially constant. Likewise, the incline mechanism 5 can be operated with substantially no change to the height or orientation of the floating chassis 79.

The height rise mechanism 3 is advantageous as the height rise actuator 75 is supported by the floating chassis 17. This arrangement can provide additional space under the seat frame 2 and potentially allow a reduced minimum rise height for the seat frame 2.

The incline mechanism 5 described herein is advantageous as the backrest actuator 119 can be moved away from the back of the seat 1. At least in some embodiments, this can provide additional space at the bottom of the seat frame 2, potentially allowing a reduction in the width of the seat frame 2. Moreover, in the present embodiment, the backrest actuator 93 is positioned at the front of the seat frame 2 and can function as an active mass damper.

A rear elevation of the seat 1 is shown in Figure 11 illustrating the plan form of the spine 79.

The arrangement of the spine 79 in the present embodiment is advantageous as it can form a continuous protective element over the full height of the backrest 9 (and optionally into an integrated headrest). As shown in Figures 1 and 11, the spine 79 is disposed centrally within the backrest 9. A padded backrest 127 can be mounted to the spine 79 along with first and second side bolsters 129, 131. A headrest 133 is mounted to the top of the spine 79 and, in the present embodiment, integrated into the side bolsters 129,131.

A rear perspective view of the backrest 9 is shown in Figure 12 and a corresponding exploded assembly view is shown in Figure 13. The backrest 9 comprises a backrest assembly 137 mounted to the spine 79 by a series of mechanical fasteners 139. As shown in Figure 13, the backrest assembly 137 forms the side bolsters 129, 131 and a back support panel 141 for supporting the back of a seat occupant. A padding material, such as a foam material, is provided on the side bolsters 129, 131 and the back support panel 141. A finishing material is provided over the padding material to form the outer surface of the seat 1. The finishing material can, for example, be fabric or leather. In the assembled seat 1, a trim panel 143 is mounted to the backrest assembly 137 to hide the mechanical fasteners 139. The backrest assembly 137 can be fabricated independently of the spine 79 and can be mounted in position once the seat frame 2 has been installed in the vehicle. Significantly, the backrest assembly 137 can be trimmed by applying the finishing material over the side bolsters 129, 131 and the back support panel 141 prior to mounting the backrest assembly 137 to the spine 79. This is desirable to reduce the risk of the finishing material being marked or damaged during the assembly process.

The box section of the spine 79 provides a passage that can be used as a conduit for electrical systems and/or conveying air through the backrest 9. For example, electrical connections for an entertainment system disposed in the back of the seat (for example comprising a headrest-mounted display screen) could be located within the passage.

Alternatively, or in addition, a passage could, for example, convey hot or cold air to one or more vents provided in the backrest 9. In the present embodiment, an air vent 135 is disposed at the top of the spine 79 and arranged to direct airflow into the rear of the vehicle cabin. A pivoting table 137 is mounted to the spine 79 by a hinge 139. The configuration of the spine 79 described herein is believed to be independently patentable.

The seat frame 2 has been described herein with electric motors for operating the height rise mechanism 3 and the incline mechanism 5. However, one or both of these mechanisms 3, 5 could be operated manually. The height rise actuator 75 and/or the backrest actuator 93 could comprise a manual actuator, such as a turn wheel or a lever.

It will be appreciated that various changes and modifications can be made to the seat frame 2 described herein. For example, a separate actuator could be provided for actively controlling the rear pivot member 21. This arrangement would provide a further degree of freedom and enable the angular orientation of the floating chassis 17 to be varied. The base incline actuator could also be mounted to the floating chassis 17. The operation of the base incline actuator and the backrest actuator 119 could be integrated to allow independent control of the incline angles of the base 5 and the backrest 7.

Aspects of the present invention will now be described with reference to the following numbered paragraphs.

1. A seat adjustment apparatus for a vehicle seat, the apparatus comprising: a pivoting frame assembly comprising: a pivotally mounted first link; a pivotally mounted second link; and at least one floating link connecting said at least one first pivot member to said at least one second pivot member; actuating means for controllably adjusting the configuration of the pivoting frame assembly, wherein the actuating means drivingly connects said at least one floating link to said at least one first pivot member.

2. A seat adjustment apparatus as described in paragraph 1, wherein the actuating means is configured to apply a force offset from a pivot axis of said first link and said at least one floating link.

3. A seat adjustment apparatus as described in paragraph 1, wherein the first link is provided at the front of the seat adjustment apparatus and the second link is provided at the back of the seat adjustment apparatus.

4. A seat adjustment apparatus as described in paragraph 1, wherein the first link and the second link are pivotally mounted to a rail.

5. A seat adjustment apparatus as described in paragraph 4, the first link and/or the second link comprising at least one mounting bracket pivotally coupled to said first and second rails; and at least one support bracket pivotally coupled to said floating link.

6. A seat adjustment apparatus as described in paragraph 5, wherein said at least one mounting bracket is angularly offset from said at least one support bracket.

7. A seat adjustment apparatus as described in paragraph 5, wherein said at least one mounting bracket and said at least one support bracket are mounted to a transverse tube.

8. A seat adjustment apparatus as described in paragraph 1, wherein the floating link comprises a chassis member or a transfer member.

9. A seat adjustment apparatus as described in paragraph 1, wherein the actuator comprises a linear actuator.

10. A seat adjustment apparatus as described in paragraph 9, wherein the linear actuator is drivingly connected to an actuating arm coupled to said first link.

11. A seat adjustment apparatus as described in paragraph 1, wherein the actuator comprises a rotary actuator.

12. A seat adjustment apparatus as described in paragraph 11, wherein said rotary actuator comprises a drive gear rotatable about a pivot axis of the floating link and the first link pivot.

13. A seat adjustment apparatus as described in paragraph 1, wherein the actuating means comprises an electric drive motor and/or a hand actuator.

14. A seat adjustment apparatus as described in paragraph 1, wherein the seat adjustment apparatus is configured to adjust a rise height of said floating link; and/or to adjust an angular orientation of said floating link.

15. A seat adjustment apparatus as described in paragraph 1, wherein said second link is a seat backrest and the seat adjustment apparatus is configured to adjust an incline angle of said backrest.

16. Apparatus comprising a first seat adjustment apparatus as described in paragraph 12 and a second seat adjustment apparatus as described in paragraph 15.

17. Apparatus as described in paragraph 16, wherein the second seat adjustment apparatus is mounted to the first seat adjustment apparatus.

18. A seat comprising a seat adjustment apparatus as described in paragraph 1; or apparatus as described in paragraph 16.

19. A vehicle comprising a seat adjustment apparatus as described in paragraph 1; or a seat as described in paragraph 18.

21. A vehicle seat chassis comprising: a first rail and a second rail arranged substantially parallel to each other; a first pivot member and a second pivot member; and a floating link connecting the first and second pivot members; the first pivot member comprising: a first cross member having a first longitudinal axis; one or more first mounting brackets pivotally mounting the first cross member to the first and second rails, the one or more first mounting brackets defining a first pivot axis about which the first cross member pivots; and one or more first support brackets pivotally mounting the floating link to the first cross member, the one or more first support brackets defining a second pivot axis about which the floating link pivots; wherein the first longitudinal axis, the first pivot axis and the second pivot axis are arranged substantially parallel to and offset from each other.

22. A vehicle seat chassis as described in paragraph 21, wherein said one or more first mounting brackets are angularly and/or laterally offset from said one or more first support brackets.

23. A vehicle seat chassis as desciibed in paragiaph 21, wherein one of said fiist mounting brackets is disposed at each end of the first cross member.

24. A vehicle seat chassis as described in paragraph 23, wherein said one or more first support brackets are disposed on the first cross member between said first mounting brackets.

25. A vehicle seat chassis as described in paragraph 21, wherein said first cross member comprises a tubular member.

26. A vehicle seat chassis as described in paragraph 21, wherein the second pivot member comprises: a second cross member having a second longitudinal axis; one or more second mounting brackets pivotally mounting the second cross member to the first and second rails, the one or more second mounting brackets defining a third pivot axis about which the second cross member pivots; and one or more second support brackets pivotally mounting the floating link to the first cross member, the one or more second support brackets defining a fourth pivot axis about which the floating link pivots; wherein the second longitudinal axis, the third pivot axis and the fourth pivot axis are arranged substantially parallel to and offset from each other.

27. A vehicle seat chassis as described in paragraph 26, wherein said one or more second mounting brackets are angularly and/or laterally offset from said one or more second support brackets.

28. A vehicle seat chassis as described in paragraph 26, wherein one of said second mounting brackets is disposed at each end of the second cross member.

29. A vehicle seat chassis as described in paragraph 28, wherein said one or more second support brackets are disposed on the second cross member between said second mounting brackets.

30. A vehicle seat chassis as described in paragraph 26, wherein said second cross member comprises a tubular member.

31. A vehicle seat chassis as described in paragraph 26, wherein the longitudinal axes of the first and second cross members are arranged substantially parallel to each other.

32. A vehicle seat chassis as described in paragraph 21, wherein said first and second rails are configured to be slidably mounted.

33. A vehicle seat incorporating a vehicle seat chassis as described in paragraph 21.

34. A vehicle having a vehicle seat chassis as described in paragraph 21.

Claims

CLAIMS: 1. A seat adjustment apparatus for a vehicle seat, the apparatus comprising: a pivoting frame assembly comprising: at least one first pivot member; at least one second pivot member; and at least one floating link connecting said at least one first pivot member to said at least one second pivot member; actuating means for controllably adjusting the configuration of the pivoting frame assembly, wherein the actuating means drivingly connects said at least one floating link to said at least one first pivot member.
2. A seat adjustment apparatus as claimed in claim 1, wherein the actuating means is configured to apply a force offset from a pivot axis of said pivoting frame assembly.
3. A seat adjustment apparatus as claimed in claim 1 or claim 2, wherein the at least one first pivot member is provided at the front of the seat adjustment apparatus and the at least one second pivot member is provided at the back of the seat adjustment apparatus.
4. A seat adjustment apparatus as claimed in any one of claims 1, 2 or 3, wherein the at least one first pivot member and the at least one second pivot member are pivotally mounted between first and second rails.
5. A seat adjustment apparatus as claimed in claim 4, the at least one first pivot member and/or the at least one second pivot member comprising at least one mounting bracket pivotally coupled to said first and second rails; and at least one support bracket pivotally coupled to said at least one floating link.
6. A seat adjustment apparatus as claimed in claim 5, wherein said at least one mounting bracket is angularly offset from said at least one support bracket.
7. A seat adjustment apparatus as claimed in claim 5 or claim 6, wherein said at least one mounting bracket and said at least one support bracket are mounted to a transverse tube.
8. A seat adjustment apparatus as claimed in any one of the preceding claims, wherein the at least one floating link comprises a chassis member or a transfer member.
9. A seat adjustment apparatus as claimed in any one of the preceding claims, wherein the actuating means comprises a linear actuator.
10. A seat adjustment apparatus as claimed in claim 9, wherein the linear actuator is drivingly connected to an actuating arm coupled to said at least one first pivot member.
11. A seat adjustment apparatus as claimed in any one of claims 1 to 8, wherein the actuating means comprises a rotary actuator.
12. A seat adjustment apparatus as claimed in claim 11, wherein said rotary actuator comprises a drive gear rotatable about a pivot axis of the pivoting frame assembly.
13. A seat adjustment apparatus as claimed in any one of the preceding claims, wherein the actuating means comprises an electric drive motor and/or a hand actuator.
14. A seat adjustment apparatus as claimed in any one of the preceding claims, wherein the seat adjustment apparatus is configured to adjust a rise height of said floating link; and/or to adjust an angular orientation of said at least one second pivot member.
15. A seat adjustment apparatus as claimed in any one of claims 1 to 13, wherein said at least one second pivot member is a seat backrest and the seat adjustment apparatus is configured to adjust an incline angle of said seat backrest.
16. Apparatus comprising a first seat adjustment apparatus as claimed in 14 and a second seat adjustment apparatus as claimed in claim 15.
17. Apparatus as claimed in claim 16, wherein the second seat adjustment apparatus is mounted to the first seat adjustment apparatus.
18. A seat comprising a seat adjustment apparatus as claimed in any one of claims 1 to 15; or apparatus as claimed in claim 16 or claim 17.
19. A vehicle comprising a seat adjustment apparatus as claimed in any one of claims 1 to 15; or a seat as claimed in claim 18.
20. A seat adjustment apparatus substantially as herein described with reference to the accompanying Figures.
21. A vehicle seat chassis comprising: a first rail and a second rail arranged substantially parallel to each other; a first pivot member and a second pivot member; and a floating link connecting the first and second pivot members; the first pivot member comprising: a first cross member having a first longitudinal axis; one or more first mounting brackets pivotally mounting the first cross member to the first and second rails, the one or more first mounting brackets defining a first pivot axis about which the first cross member pivots; and one or more first support brackets pivotally mounting the floating link to the first cross member, the one or more first support brackets defining a second pivot axis about which the floating link pivots; wherein the first longitudinal axis, the first pivot axis and the second pivot axis are arranged substantially parallel to and offset from each other.
22. A vehicle seat chassis as claimed in claim 21, wherein said one or more first mounting brackets are angularly and/or laterally offset from said one or more first support brackets.
23. A vehicle seat chassis as claimed in claim 21 or claim 22, wherein one of said first mounting brackets is disposed at each end of the first cross member.
24. A vehicle seat chassis as claimed in claim 23, wherein said one or more first support brackets are disposed on the first cross member between said first mounting brackets.
25. A vehicle seat chassis as claimed in any one of claims 21 to 24, wherein said first cross member comprises a tubular member.
26. A vehicle seat chassis as claimed in any one of claims 21 to 25, wherein the second pivot member comprises: a second cross member having a second longitudinal axis; one or more second mounting brackets pivotally mounting the second cross member to the first and second rails, the one or more second mounting brackets defining a third pivot axis about which the second cross member pivots; and one or more second support brackets pivotally mounting the floating link to the first cross member, the one or more second support brackets defining a fourth pivot axis about which the floating link pivots; wherein the second longitudinal axis, the third pivot axis and the fourth pivot axis are arranged substantially parallel to and offset from each other.
27. A vehicle seat chassis as claimed in claim 26, wherein said one or more second mounting brackets are angularly and/or laterally offset from said one or more second support brackets.
28. A vehicle seat chassis as claimed in claim 26 or claim 27, wherein one of said second mounting brackets is disposed at each end of the second cross member.
29. A vehicle seat chassis as claimed in claim 28, wherein said one or more second support brackets are disposed on the second cross member between said second mounting brackets.
30. A vehicle seat chassis as claimed in any one of claims 26 to 29, wherein said second cross member comprises a tubular member.
31. A vehicle seat chassis as claimed in any one of claims 26 to 30, wherein the longitudinal axes of the first and second cross members are arranged substantially parallel to each other.
32. A vehicle seat chassis as claimed in any one of claims 21 to 31, wherein said first and second rails are configured to be slidably mounted.
33. A vehicle seat incorporating a vehicle seat chassis as claimed in any one of claims 21 to 32.
34. A vehicle having a vehicle seat chassis as claimed in any one of claims 21 to 32.