WO2006112779A1 - Brake device for walker and walker comprising the brake device - Google Patents

Brake device for walker and walker comprising the brake device Download PDF

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Publication number
WO2006112779A1
WO2006112779A1 PCT/SE2006/000463 SE2006000463W WO2006112779A1 WO 2006112779 A1 WO2006112779 A1 WO 2006112779A1 SE 2006000463 W SE2006000463 W SE 2006000463W WO 2006112779 A1 WO2006112779 A1 WO 2006112779A1
Authority
WO
WIPO (PCT)
Prior art keywords
force transmission
transmission element
brake
walker
control means
Prior art date
Application number
PCT/SE2006/000463
Other languages
French (fr)
Inventor
Sven-Inge Kjell
Patrik Andersson
Joakim Andersson
Original Assignee
Volaris Sweden Ab
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Volaris Sweden Ab filed Critical Volaris Sweden Ab
Publication of WO2006112779A1 publication Critical patent/WO2006112779A1/en

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61H—PHYSICAL THERAPY APPARATUS, e.g. DEVICES FOR LOCATING OR STIMULATING REFLEX POINTS IN THE BODY; ARTIFICIAL RESPIRATION; MASSAGE; BATHING DEVICES FOR SPECIAL THERAPEUTIC OR HYGIENIC PURPOSES OR SPECIFIC PARTS OF THE BODY
    • A61H3/00—Appliances for aiding patients or disabled persons to walk about
    • A61H3/04—Wheeled walking aids for patients or disabled persons
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62B—HAND-PROPELLED VEHICLES, e.g. HAND CARTS OR PERAMBULATORS; SLEDGES
    • B62B5/00—Accessories or details specially adapted for hand carts
    • B62B5/04—Braking mechanisms; Locking devices against movement
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T1/00—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles
    • B60T1/02—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles acting by retarding wheels
    • B60T1/06—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles acting by retarding wheels acting otherwise than on tread, e.g. employing rim, drum, disc, or transmission or on double wheels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T11/00—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant
    • B60T11/04—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant transmitting mechanically
    • B60T11/046—Using cables
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T7/00—Brake-action initiating means
    • B60T7/02—Brake-action initiating means for personal initiation
    • B60T7/08—Brake-action initiating means for personal initiation hand actuated
    • B60T7/10—Disposition of hand control
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61H—PHYSICAL THERAPY APPARATUS, e.g. DEVICES FOR LOCATING OR STIMULATING REFLEX POINTS IN THE BODY; ARTIFICIAL RESPIRATION; MASSAGE; BATHING DEVICES FOR SPECIAL THERAPEUTIC OR HYGIENIC PURPOSES OR SPECIFIC PARTS OF THE BODY
    • A61H3/00—Appliances for aiding patients or disabled persons to walk about
    • A61H3/04—Wheeled walking aids for patients or disabled persons
    • A61H2003/046—Wheeled walking aids for patients or disabled persons with braking means

Definitions

  • the present invention relates to a brake device for a walker.
  • the present invention relates to a brake device for a walker, comprising a control means connected movably to a brake by at least one elongate force transmission element and intended to regulate the braking action of the brake via the force transmission element.
  • Brake devices of this kind are used for braking a walker or similar transport means.
  • Such brake devices often comprise a control means for regulating the braking action by means of manual force, whereby the control means is movable between a free position with no braking action and at least one braking position for braking action.
  • the movement effected at the control means is usually passed on to a brake or similar braking element, e.g. a disc brake, sliding brake or other type of conventional brake, via at least one force transmission element.
  • a usual type of brake device of the kind here intended is a hand brake for a transport means, e.g. for functionally impaired persons such as the handicapped, the elderly or other persons in need of auxiliary means for movement.
  • the state of the art comprises a plurality of different types of brake devices for walkers.
  • One such type of device is a hand brake system with a control means attached to a handle of a walker and intended for operating the walker's brake.
  • the control means is connected to the brake by a force transmission element in the form of a wire, whereby the brake is activated when a user pulls the wire via the control means.
  • the wire often extends from the handle at an upper portion of the walker to the brake at a lower portion of the walker, whereby the wire is pulled upwards to activate the brake and is slid downwards to release the brake.
  • the brake device may be adapted to being resilient towards the free position.
  • the wire usually hangs beside and extends along a frame of the walker between the control means at the handle and the brake at a wheel of the walker.
  • a problem with state of the art devices of this kind is that the wire hangs from the side of the walker and hinders the use and transport of the walker.
  • a disadvantage of state of the art devices of this kind is that a relatively long wire is required to make it possible to set the height of the walker's handle in the height direction. This means when the handle is not in its highest position there is an excess of wire which may be particularly troublesome during use and transport of the walker.
  • the force transmission element comprises, instead of the wire, one or more rigid rods which connect, and therefore extend substantially vertically between, a control means and a brake.
  • an upper rod may be connected to a lower rod via a connecting washer or the like, whereby the rods run through recesses in the washer and are movable for setting in the height direction when the control means is in its free position.
  • the upper rod may be connected to the control means in such a way that it is pulled upwards when a user pulls the control means.
  • the washer assumes an oblique position and locks the lower rod firmly so that the upper rod carries the lower rod upwards with it, whereupon the longitudinal movement of the lower rod activates the brake.
  • a problem with state of the art devices of this kind is that setting the handle and the brake device in the vertical direction may be difficult, since there is risk that the washer connecting the rods may become caught.
  • a further problem with state of the art devices of this kind is that their construction may entail risk of malfunctions of the force transmission element in the brake device, since the braking function depends on friction between the lower rod and the washer connecting the rods. If the lower rod slips relative to the washer, the brake device loses its braking function, resulting in greater risk of accidents.
  • a disadvantage of state of the art devices of this kind is that the possibility of using gears for transmission of force from the control means to the brake is limited.
  • An object of the invention is to eliminate the abovementioned disadvantages and problems of state of art brake devices for walkers.
  • the device according to the invention results in a safe brake device with a function which makes it easy to set the height of a handle of a walker or the like and which makes it easy to transfer via gears the force transmitted between the control means and the brake. This is achieved by the brake device being provided with the features indicated in claim 1.
  • a further object of the present invention is to provide a walker comprising the brake device.
  • the invention thus relates to a brake device for a walker, comprising a control means connected movably to a brake by at least one elongate force transmission element and intended to regulate the braking action of the brake via the force transmission element, characterised in that the force transmission element is arranged for rotation about a axis running along it in order to transmit a force, associated with a movement of the control means, in the form of a rotary motion about said axis.
  • the brake device comprises an elongate first force transmission element and, connected to the latter, an elongate second force transmission element which are adapted to being movable along said axis for height setting and to being rotatable about the axis for force transmission.
  • the brake device according to the invention is so designed that the force transmission elements are movable in a longitudinal first direction for height setting and are rotatable, about an axis running along them, in a second direction for force transmission.
  • the force transmission elements are movable in a height direction relative to one another while at the same time they are connected in a torsionally rigid manner and do not allow mutual relative rotation, with the result that the rotary motion is transmitted from the first force transmission element to the second force transmission element during force transmission between the control means and the brake.
  • Force transmission and height setting are effected in two mutually different directions of movement, thereby reducing the risk that the brake device might become caught and jam, e.g. during height setting.
  • the force transmission elements may be connected telescopically, whereby, for example, the first force transmission element takes the form of a tube and the second force transmission element takes the form of a tube or a rod.
  • the force transmission elements may take the form of square tubes.
  • the force transmission elements may take the form of tubes with three, five or more sides, of oval tubes or of circular tubes provided with respective grooves and protruding portions or the like, so that the force transmission elements engage with one another during rotation.
  • the control means may be connected to the first force transmission element by a connecting device which converts the movement of the control means to rotary motion of the force transmission elements.
  • the connecting device may comprise a wire wound about an upper portion of the force transmission element in order to subject the force transmission element to rotation when a user operates the control means.
  • the wire is connected to the force transmission element by a gear element to facilitate braking so that less force is needed for applying effective braking. This may be an advantage in cases where the user of the walker has reduced strength in the hands.
  • the gear element may comprise a portion of the force transmission element with a larger circumference than other portions thereof, which portion is connected to and wound about by the wire.
  • the force transmission elements may be supported within the walker's frame or a tube of the frame which extends substantially between a handle and a wheel of the walker.
  • the force transmission elements may be supported within a first frame portion and a second frame portion which is connected to the first and is settable in the height direction.
  • the first frame portion may be connected to the handle of the walker and the second frame portion may be connected to the wheel of the walker, whereby the handle is settable in the height direction, carrying with it the brake device.
  • the frame portions may be fastened at desired heights by means of a conventional fastening device.
  • Fig. 1 is a schematic side view of a walker
  • Fig. 2 is a schematic side view partly in section of a portion of the walker, showing the force transmission principle of the brake device
  • Fig. 3 is a schematic side view partly in section of a portion of the walker, showing the brake device in a free position with no braking action according to an embodiment of the invention
  • Fig. 4 is a schematic side view partly in section of a portion of the walker, showing the brake device according to Fig. 2 in a braking position for braking action,
  • Fig. 5 is a schematic side view partly in section of a portion of the walker, showing height setting of the handle and the brake device according to Fig. 2 and Fig. 3,
  • Fig. 6 is a schematic side view partly in section, showing a force transmission element of the brake device according to an embodiment of the present invention which is provided with a gear element,
  • Fig. 7 is a schematic cross-sectional view of a frame portion of the walker, showing the force transmission elements in a free position of the brake device according to a first embodiment of the invention
  • Fig. 8 is a schematic cross-sectional view according to Fig. 6, showing the force transmission elements in a braking position of the brake device
  • Fig. 9 is a schematic cross-sectional view of a frame portion of the walker, showing the force transmission elements according to a second embodiment of the invention
  • Fig. 10 is a schematic cross-sectional view of a frame portion of the walker, showing the force transmission elements according to a third embodiment of the invention
  • Fig. 11 is a schematic cross-sectional view of a frame portion of the walker, showing the force transmission elements according to a fourth embodiment of the invention.
  • Fig. 12 is a schematic cross-sectional view of a frame portion of the walker, showing the force transmission elements according to a fifth embodiment of the invention
  • Fig. 13 is a schematic cross-sectional view of a frame portion of the walker, showing the force transmission elements according to a sixth embodiment of the invention.
  • a walking aid takes the form of a walker 10 which has a frame 12 provided with wheels 11 and which has a handle 13 for gripping by a user's hand when walking with the walker 10.
  • the handle 13 is disposed at an upper portion of the walker 10, and the wheels 11 at a lower portion of the walker 10 in a conventional manner.
  • the walker 10 is provided with a brake device comprising a control means 15 connected movably to a brake 14 and intended for operating the brake 14.
  • the brake 14 is disposed at at least one wheel 11.
  • the brake 14 takes the form of a drum brake.
  • the brake 14 takes the form of a disc brake, sliding brake or other type of conventional brake.
  • Fig. 2 illustrates schematically the principle of the brake device.
  • the brake 14 is connected to the control means 15 by at least one elongate force transmission element 16, whereby the control means 15 is designed for applying the brake 14 and regulating the braking action via the force transmission element 16.
  • the force transmission element 16 extends substantially between the control means 15 at the handle 13 and the brake 14 at the wheel 11 , whereby the force transmission element 16 extends mainly vertically.
  • the force transmission element 16 may be made of a relatively rigid material, e.g. metal or suitable plastic material.
  • the force transmission element 16 takes the form of a tube or a rod, as described in more detail below.
  • the force transmission element 16 is arranged for rotation about an axis A running along it to transmit a force, associated with a movement of the control means 15, in the form of a rotary motion about said axis A.
  • the axis A runs through the force transmission element 16 in the tetter's longitudinal direction in such a way that the axis A is the force transmission element's axis.
  • the axis A runs parallel with the axis of the force transmission element 16.
  • the control means 15 is connected to the force transmission element 16 in such a way that the force transmission element 16 rotates about the axis A, as illustrated by the arrow B, when a user brakes by means of the control means 15.
  • a user When braking, a user may for example rotate or pull the control means 15 upwards or in a direction away from the brake 14, as illustrated by the arrow C.
  • the force associated with the rotary motion of the force transmission element 16 is transmitted to the brake 14 for braking, as illustrated by the arrow D.
  • the control means 15 is connected to the force transmission element via a connecting device 17 in such a way that the movement of the control means 15 is converted to rotary motion of the force transmission element 16.
  • the connecting device 17 may comprise a wire extending between the control means 15 and the force transmission element 16.
  • part of the wire is wound about the force transmission element 16 in order to bring about the rotary motion, as described in more detail below.
  • the control means 15 may be connected to the force transmission element via a pulley or the like.
  • the force transmission element 16 is connected to the brake 14 via a bushing 18 and a connector 19 which accompanies the force transmission element in its movement about the axis A.
  • the connector 19 is connected to the brake 14 via a washer 20 or the like, whereby the washer 20 likewise accompanies the movement about the axis A so that the brake 14 comes to abut against the wheel 11 in order to effect braking.
  • the brake 14 comprises for example an arm 22 which is provided with a brake shoe 21 and which via an articulation 23 is connected to the washer 20 so that during braking the arm 22 pivots about the articulation 23 in the direction of the arrow D until the brake shoe 21 abuts against the wheel 11.
  • the brake device may be resilient so that it returns to its free position when the user stops braking.
  • the force transmission element 16 is disposed in a portion of the frame 12 of the walker 10, e.g. a member in the form of a tube or the like extending substantially between the handle 13 and the brake 14.
  • the force transmission element 16 extends along this portion of the frame 12.
  • the force transmission element 16 is suspended or supported in the frame 12 in such a way that it can rotate about the axis A running along it.
  • Figs. 3-5 illustrate schematically a brake device according to an embodiment of the invention which is settable in the height direction.
  • Fig. 3 depicts the brake device in a free position with no braking effect
  • Fig.4 depicts the brake device in a braking position for braking action
  • Fig. 5 depicts the handle 13 and the brake device in a lowered position.
  • the handle 13 is settable in the height direction. Accordingly, the brake device is also settable in a corresponding direction.
  • a portion of the frame 12 is settable by means of a first frame portion 12a and a second frame portion 12b, whereby the first frame portion is insertable in the second frame portion 12b, thereby constituting a telescopic function.
  • the frame portions 12a, 12b may for example extend between the handle 13 and the wheel 11.
  • the frame portions 12a, 12b take the form of tubes and surround a first force transmission element 16a and a second force transmission element 16b.
  • the force transmission elements 16a, 16b are elongate and rotatable about an axis running along or parallel with them in order to transmit a force, associated with a movement of the control means 15, in the form of rotary motion about said axis in the same way as described above with reference to Fig. 2.
  • the first force transmission element 16a is connected to the second force transmission element 16b in such a way that the rotary motion is transmitted from the first force transmission element 16a to the second force transmission element 16b.
  • the first force transmission element 16a is connected to the control means 15, whereby the first force transmission element 16a is an upper force transmission element, and the second force transmission element 16b is connected to the brake 14, the second force transmission element 16b being a lower force transmission element.
  • the first force transmission element 16a may be connected to the control means 15 via the connecting device 17 and, for example, the second force transmission element 16b may be connected to the brake 14 via the connector 19, as described above.
  • the first force transmission element 16a is connected movably to the second force transmission element 16b in such a way that their mutual relative position is sellable in the longitudinal direction, whereby the force transmission elements 16a, 16b are settable in the height direction.
  • the force transmission elements 16a, 16b are connected together, thereby constituting a telescopic function for height setting.
  • the first force transmission element 16a takes the form of a tube for accommodating the second force transmission element
  • the frame 12 is provided with a conventional fastening device 24 so that the frame portions 12a, 12b and the force transmission elements 16a, 16b can be locked at a desired height, whereby the first frame portion 12a can be set as a desired height, being accompanied by the first force transmission element 16a when the fastening device 24 is released, and so that the first frame portion 12a can be fastened to the second frame portion 12b at the desired height when the fastening device 24 is applied.
  • the brake device is so designed that the force transmission elements 16a, 16b are movable in a longitudinal first direction for height setting and about an axis in a second direction for force transmission, the first direction being different from the second direction.
  • Fig. 6 illustrates the force transmission element 16 of the brake device according to an embodiment of the present invention which is provided with a gear element 25.
  • the force transmission element is the upper first force transmission element 16a.
  • both the upper first and the lower second force transmission elements 16a, 16b are provided with a gear element 25 in a corresponding manner.
  • the force transmission element 16 may be provided with a portion with a larger circumference which constitutes the gear element 25 and gearing by a lever effect.
  • the connecting device 17 is a wire 26 wound at least partly about the gear element 25 and connected to the control means 15 and the gear element 25 respectively, whereby pulling the wire 26 via the control means 15 subjects the gear element 25 to rotation, carrying with it the force transmission element 16 in the same direction.
  • a portion of the wire 26 runs for example in a protective sleeve 27 in a conventional manner.
  • Fig. 7 and Fig. 8 illustrate the connection between the force transmissions elements 16a, 16b, which is movable in the longitudinal direction but at the same time rotatable jointly with them, according to a first embodiment of the invention.
  • Fig. 7 depicts the force transmission elements 16a, 16b in a free position with no braking effect
  • Fig. 8 depicts the force transmission elements 16a, 16b in a braking position for braking action.
  • the force transmission elements 16a, 16b take the form of square tubes, one of them designed to accommodate the other.
  • the first force transmission element 16a takes the form of a tube for accommodating the second force transmission element 16b in the form of a tube or rod, whereby an inside circumference and shape of the first force transmission element 16a largely corresponds to an outer circumference and shape of the second force transmission element 16b.
  • the force transmission elements 16a, 16b are designed to prevent mutual relative rotation while at the same time allowing setting in the height direction.
  • the first force transmission element 16a may, in a plane disposed transversely to it, be provided with a varying radial distance between its axis and its inside surface, which radial distance is constant in the longitudinal direction, while the second force transmission element 16b may be provided with an outside surface corresponding to the inside surface of the first force transmission element 16a.
  • the control means 15 When a user pulls the control means 15, corresponding pulling motion is transmitted to the wire 26, as illustrated in Fig. 8 by the arrow C.
  • the wire 26 is wound about and connected to the first force transmission element 16a via the gearing means 25 so that pulling the wire 26 causes the first force transmission element 16a and hence the second force transmission element 16b to rotate about their axis, as illustrated by the arrow B.
  • the wire 26 or other connecting device 17 may be connected directly to the first force transmission element 16a.
  • the force transmission elements 16a, 16b Connecting together the force transmission elements 16a, 16b to make mutual relative movement possible in the longitudinal direction and at the same time prevent mutual relative rotation can be achieved in a number of ways.
  • One example is to use force transmission elements 16a, 16b in the form of square tubes, as described above.
  • the force transmission elements 16a, 16b may take the form of tubes with at least three sides or some other desired number of sides.
  • the force transmission elements 16a, 16b may be of oval profile, as depicted in Fig. 9.
  • the force transmission elements 16a, 16b are provided with a longitudinal protruding portion, e.g. a ridge or nib 28, and a longitudinal recess 29 for mutual engagement, as depicted in Fig. 10.
  • the force transmission elements 16a, 16b in the embodiments depicted in Fig. 11 and Fig. 12 are provided with a plurality of such nibs 28 and respective corresponding recesses 29, thereby constituting a gearwheel formation.
  • the force transmission elements 16a, 16b are connected together by a connecting element 30 as depicted in Fig. 13.
  • the force transmission elements 16a, 16b run through recesses of the connecting element 30, whereby the force transmission elements 16a, 16b and the respective recesses are configured in the same way as described above in order to prevent mutual relative rotation while at the same time maintaining possibilities of setting in the height direction.
  • the force transmission elements 16a, 16b may be disposed substantially parallel, whereby the first force transmission element 16a is arranged for rotation about the axis of the second force transmission element 16b. This results at the same time in gearing by a lever effect.

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Abstract

The present invention relates to a brake device for a walker (10), comprising a control means (15) connected movably to a brake (14) by at least one elongate force transmission element (16) and intended to regulate the braking action of the brake (14) via the force transmission element (16), whereby the force transmission element (16) is arranged for rotation about an axis (A) running along it in order to transmit a force, associated with a movement (C) of the control means, in the form of a rotary motion (B) about said axis (A). The invention also relates to a walker (10) comprising such a brake device.

Description

BRAKE DEVICE FOR WALKER AND WALKER COMPRISING THE BRAKE DEVICE
SCOPE OF THE INVENTION
The present invention relates to a brake device for a walker. In particular, the present invention relates to a brake device for a walker, comprising a control means connected movably to a brake by at least one elongate force transmission element and intended to regulate the braking action of the brake via the force transmission element.
Brake devices of this kind are used for braking a walker or similar transport means. Such brake devices often comprise a control means for regulating the braking action by means of manual force, whereby the control means is movable between a free position with no braking action and at least one braking position for braking action. The movement effected at the control means is usually passed on to a brake or similar braking element, e.g. a disc brake, sliding brake or other type of conventional brake, via at least one force transmission element. A usual type of brake device of the kind here intended is a hand brake for a transport means, e.g. for functionally impaired persons such as the handicapped, the elderly or other persons in need of auxiliary means for movement.
STATE OF THE ART The state of the art comprises a plurality of different types of brake devices for walkers. One such type of device is a hand brake system with a control means attached to a handle of a walker and intended for operating the walker's brake. The control means is connected to the brake by a force transmission element in the form of a wire, whereby the brake is activated when a user pulls the wire via the control means. The wire often extends from the handle at an upper portion of the walker to the brake at a lower portion of the walker, whereby the wire is pulled upwards to activate the brake and is slid downwards to release the brake. The brake device may be adapted to being resilient towards the free position. The wire usually hangs beside and extends along a frame of the walker between the control means at the handle and the brake at a wheel of the walker.
A problem with state of the art devices of this kind is that the wire hangs from the side of the walker and hinders the use and transport of the walker.
A disadvantage of state of the art devices of this kind is that a relatively long wire is required to make it possible to set the height of the walker's handle in the height direction. This means when the handle is not in its highest position there is an excess of wire which may be particularly troublesome during use and transport of the walker.
There are also brake devices and brake systems for walkers whereby the force transmission element comprises, instead of the wire, one or more rigid rods which connect, and therefore extend substantially vertically between, a control means and a brake. For example, an upper rod may be connected to a lower rod via a connecting washer or the like, whereby the rods run through recesses in the washer and are movable for setting in the height direction when the control means is in its free position. The upper rod may be connected to the control means in such a way that it is pulled upwards when a user pulls the control means. When the upper rod is pulled upwards, the washer assumes an oblique position and locks the lower rod firmly so that the upper rod carries the lower rod upwards with it, whereupon the longitudinal movement of the lower rod activates the brake.
A problem with state of the art devices of this kind is that setting the handle and the brake device in the vertical direction may be difficult, since there is risk that the washer connecting the rods may become caught.
A further problem with state of the art devices of this kind is that their construction may entail risk of malfunctions of the force transmission element in the brake device, since the braking function depends on friction between the lower rod and the washer connecting the rods. If the lower rod slips relative to the washer, the brake device loses its braking function, resulting in greater risk of accidents. A disadvantage of state of the art devices of this kind is that the possibility of using gears for transmission of force from the control means to the brake is limited.
SUMMARY OF THE INVENTION
An object of the invention is to eliminate the abovementioned disadvantages and problems of state of art brake devices for walkers. The device according to the invention results in a safe brake device with a function which makes it easy to set the height of a handle of a walker or the like and which makes it easy to transfer via gears the force transmitted between the control means and the brake. This is achieved by the brake device being provided with the features indicated in claim 1.
A further object of the present invention is to provide a walker comprising the brake device.
The invention thus relates to a brake device for a walker, comprising a control means connected movably to a brake by at least one elongate force transmission element and intended to regulate the braking action of the brake via the force transmission element, characterised in that the force transmission element is arranged for rotation about a axis running along it in order to transmit a force, associated with a movement of the control means, in the form of a rotary motion about said axis.
According to an embodiment of the invention, the brake device comprises an elongate first force transmission element and, connected to the latter, an elongate second force transmission element which are adapted to being movable along said axis for height setting and to being rotatable about the axis for force transmission. Accordingly, the brake device according to the invention is so designed that the force transmission elements are movable in a longitudinal first direction for height setting and are rotatable, about an axis running along them, in a second direction for force transmission. In other words, the force transmission elements are movable in a height direction relative to one another while at the same time they are connected in a torsionally rigid manner and do not allow mutual relative rotation, with the result that the rotary motion is transmitted from the first force transmission element to the second force transmission element during force transmission between the control means and the brake. Force transmission and height setting are effected in two mutually different directions of movement, thereby reducing the risk that the brake device might become caught and jam, e.g. during height setting.
The force transmission elements may be connected telescopically, whereby, for example, the first force transmission element takes the form of a tube and the second force transmission element takes the form of a tube or a rod. For example, the force transmission elements may take the form of square tubes. Alternatively the force transmission elements may take the form of tubes with three, five or more sides, of oval tubes or of circular tubes provided with respective grooves and protruding portions or the like, so that the force transmission elements engage with one another during rotation. The control means may be connected to the first force transmission element by a connecting device which converts the movement of the control means to rotary motion of the force transmission elements. For example, the connecting device may comprise a wire wound about an upper portion of the force transmission element in order to subject the force transmission element to rotation when a user operates the control means. According to an embodiment of the invention, the wire is connected to the force transmission element by a gear element to facilitate braking so that less force is needed for applying effective braking. This may be an advantage in cases where the user of the walker has reduced strength in the hands. The gear element may comprise a portion of the force transmission element with a larger circumference than other portions thereof, which portion is connected to and wound about by the wire.
The force transmission elements may be supported within the walker's frame or a tube of the frame which extends substantially between a handle and a wheel of the walker. For example, the force transmission elements may be supported within a first frame portion and a second frame portion which is connected to the first and is settable in the height direction. The first frame portion may be connected to the handle of the walker and the second frame portion may be connected to the wheel of the walker, whereby the handle is settable in the height direction, carrying with it the brake device. For example, the frame portions may be fastened at desired heights by means of a conventional fastening device.
Further features and advantages of the present invention are indicated by the description of examples of embodiments below, the attached drawings and the dependent claims.
BRIEF DESCRIPTION OF THE DRAWINGS The invention will now be described in more detail on the basis of examples of embodiments with reference to the attached drawings, in which
Fig. 1 is a schematic side view of a walker,
Fig. 2 is a schematic side view partly in section of a portion of the walker, showing the force transmission principle of the brake device, Fig. 3 is a schematic side view partly in section of a portion of the walker, showing the brake device in a free position with no braking action according to an embodiment of the invention,
Fig. 4 is a schematic side view partly in section of a portion of the walker, showing the brake device according to Fig. 2 in a braking position for braking action,
Fig. 5 is a schematic side view partly in section of a portion of the walker, showing height setting of the handle and the brake device according to Fig. 2 and Fig. 3,
Fig. 6 is a schematic side view partly in section, showing a force transmission element of the brake device according to an embodiment of the present invention which is provided with a gear element,
Fig. 7 is a schematic cross-sectional view of a frame portion of the walker, showing the force transmission elements in a free position of the brake device according to a first embodiment of the invention, Fig. 8 is a schematic cross-sectional view according to Fig. 6, showing the force transmission elements in a braking position of the brake device,
Fig. 9 is a schematic cross-sectional view of a frame portion of the walker, showing the force transmission elements according to a second embodiment of the invention, Fig. 10 is a schematic cross-sectional view of a frame portion of the walker, showing the force transmission elements according to a third embodiment of the invention,
Fig. 11 is a schematic cross-sectional view of a frame portion of the walker, showing the force transmission elements according to a fourth embodiment of the invention,
Fig. 12 is a schematic cross-sectional view of a frame portion of the walker, showing the force transmission elements according to a fifth embodiment of the invention, Fig. 13 is a schematic cross-sectional view of a frame portion of the walker, showing the force transmission elements according to a sixth embodiment of the invention.
THE INVENTION
With reference to Fig. 1 , a walking aid takes the form of a walker 10 which has a frame 12 provided with wheels 11 and which has a handle 13 for gripping by a user's hand when walking with the walker 10. During use, the handle 13 is disposed at an upper portion of the walker 10, and the wheels 11 at a lower portion of the walker 10 in a conventional manner.
The walker 10 is provided with a brake device comprising a control means 15 connected movably to a brake 14 and intended for operating the brake 14. The brake 14 is disposed at at least one wheel 11. According to an embodiment of the invention, the brake 14 takes the form of a drum brake. Alternatively, the brake 14 takes the form of a disc brake, sliding brake or other type of conventional brake.
Fig. 2 illustrates schematically the principle of the brake device. The brake 14 is connected to the control means 15 by at least one elongate force transmission element 16, whereby the control means 15 is designed for applying the brake 14 and regulating the braking action via the force transmission element 16. The force transmission element 16 extends substantially between the control means 15 at the handle 13 and the brake 14 at the wheel 11 , whereby the force transmission element 16 extends mainly vertically. For example, the force transmission element 16 may be made of a relatively rigid material, e.g. metal or suitable plastic material. According to an embodiment of the invention, the force transmission element 16 takes the form of a tube or a rod, as described in more detail below.
The force transmission element 16 is arranged for rotation about an axis A running along it to transmit a force, associated with a movement of the control means 15, in the form of a rotary motion about said axis A. The axis A runs through the force transmission element 16 in the tetter's longitudinal direction in such a way that the axis A is the force transmission element's axis. Alternatively, the axis A runs parallel with the axis of the force transmission element 16. The control means 15 is connected to the force transmission element 16 in such a way that the force transmission element 16 rotates about the axis A, as illustrated by the arrow B, when a user brakes by means of the control means 15. When braking, a user may for example rotate or pull the control means 15 upwards or in a direction away from the brake 14, as illustrated by the arrow C. The force associated with the rotary motion of the force transmission element 16 is transmitted to the brake 14 for braking, as illustrated by the arrow D.
In the embodiment depicted, the control means 15 is connected to the force transmission element via a connecting device 17 in such a way that the movement of the control means 15 is converted to rotary motion of the force transmission element 16. For example, the connecting device 17 may comprise a wire extending between the control means 15 and the force transmission element 16. According to an embodiment of the invention, part of the wire is wound about the force transmission element 16 in order to bring about the rotary motion, as described in more detail below. Alternatively, the control means 15 may be connected to the force transmission element via a pulley or the like.
In the embodiment depicted, the force transmission element 16 is connected to the brake 14 via a bushing 18 and a connector 19 which accompanies the force transmission element in its movement about the axis A. The connector 19 is connected to the brake 14 via a washer 20 or the like, whereby the washer 20 likewise accompanies the movement about the axis A so that the brake 14 comes to abut against the wheel 11 in order to effect braking. The brake 14 comprises for example an arm 22 which is provided with a brake shoe 21 and which via an articulation 23 is connected to the washer 20 so that during braking the arm 22 pivots about the articulation 23 in the direction of the arrow D until the brake shoe 21 abuts against the wheel 11. As described above, it is possible to use various types of brakes, to which the rotary motion is transmitted in a suitable manner for effecting the braking action. For example, the brake device may be resilient so that it returns to its free position when the user stops braking.
According to an embodiment of the invention, the force transmission element 16 is disposed in a portion of the frame 12 of the walker 10, e.g. a member in the form of a tube or the like extending substantially between the handle 13 and the brake 14. The force transmission element 16 extends along this portion of the frame 12. The force transmission element 16 is suspended or supported in the frame 12 in such a way that it can rotate about the axis A running along it.
Figs. 3-5 illustrate schematically a brake device according to an embodiment of the invention which is settable in the height direction. Fig. 3 depicts the brake device in a free position with no braking effect, Fig.4 depicts the brake device in a braking position for braking action and Fig. 5 depicts the handle 13 and the brake device in a lowered position.
In the embodiment of the invention depicted in Figs. 3-5, the handle 13 is settable in the height direction. Accordingly, the brake device is also settable in a corresponding direction. For example, a portion of the frame 12 is settable by means of a first frame portion 12a and a second frame portion 12b, whereby the first frame portion is insertable in the second frame portion 12b, thereby constituting a telescopic function. The frame portions 12a, 12b may for example extend between the handle 13 and the wheel 11. The frame portions 12a, 12b take the form of tubes and surround a first force transmission element 16a and a second force transmission element 16b. The force transmission elements 16a, 16b are elongate and rotatable about an axis running along or parallel with them in order to transmit a force, associated with a movement of the control means 15, in the form of rotary motion about said axis in the same way as described above with reference to Fig. 2. Thus the first force transmission element 16a is connected to the second force transmission element 16b in such a way that the rotary motion is transmitted from the first force transmission element 16a to the second force transmission element 16b. The first force transmission element 16a is connected to the control means 15, whereby the first force transmission element 16a is an upper force transmission element, and the second force transmission element 16b is connected to the brake 14, the second force transmission element 16b being a lower force transmission element. For example, the first force transmission element 16a may be connected to the control means 15 via the connecting device 17 and, for example, the second force transmission element 16b may be connected to the brake 14 via the connector 19, as described above.
The first force transmission element 16a is connected movably to the second force transmission element 16b in such a way that their mutual relative position is sellable in the longitudinal direction, whereby the force transmission elements 16a, 16b are settable in the height direction. In the embodiment depicted in Figs. 3-5, the force transmission elements 16a, 16b are connected together, thereby constituting a telescopic function for height setting. Thus for example the first force transmission element 16a takes the form of a tube for accommodating the second force transmission element
16b, whereby the second force transmission element 16b can be pushed into the first force transmission element 16a and whereby the second force transmission element 16b runs in the first force transmission element 16a. According to an embodiment of the invention, the frame 12 is provided with a conventional fastening device 24 so that the frame portions 12a, 12b and the force transmission elements 16a, 16b can be locked at a desired height, whereby the first frame portion 12a can be set as a desired height, being accompanied by the first force transmission element 16a when the fastening device 24 is released, and so that the first frame portion 12a can be fastened to the second frame portion 12b at the desired height when the fastening device 24 is applied. Thus the second force transmission element 16b runs freely in the longitudinal direction along or inside the first force transmission element 16a when the fastening device 24 is released. Accordingly, the brake device according to the invention is so designed that the force transmission elements 16a, 16b are movable in a longitudinal first direction for height setting and about an axis in a second direction for force transmission, the first direction being different from the second direction. Fig. 6 illustrates the force transmission element 16 of the brake device according to an embodiment of the present invention which is provided with a gear element 25. Alternatively, the force transmission element is the upper first force transmission element 16a. According to an embodiment of the invention, both the upper first and the lower second force transmission elements 16a, 16b are provided with a gear element 25 in a corresponding manner. For example, the force transmission element 16 may be provided with a portion with a larger circumference which constitutes the gear element 25 and gearing by a lever effect. In the embodiment depicted, the connecting device 17 is a wire 26 wound at least partly about the gear element 25 and connected to the control means 15 and the gear element 25 respectively, whereby pulling the wire 26 via the control means 15 subjects the gear element 25 to rotation, carrying with it the force transmission element 16 in the same direction. A portion of the wire 26 runs for example in a protective sleeve 27 in a conventional manner. Fig. 7 and Fig. 8 illustrate the connection between the force transmissions elements 16a, 16b, which is movable in the longitudinal direction but at the same time rotatable jointly with them, according to a first embodiment of the invention. Fig. 7 depicts the force transmission elements 16a, 16b in a free position with no braking effect and Fig. 8 depicts the force transmission elements 16a, 16b in a braking position for braking action. In the embodiment depicted in Fig. 7 and Fig. 8, the force transmission elements 16a, 16b take the form of square tubes, one of them designed to accommodate the other. Thus at least the first force transmission element 16a takes the form of a tube for accommodating the second force transmission element 16b in the form of a tube or rod, whereby an inside circumference and shape of the first force transmission element 16a largely corresponds to an outer circumference and shape of the second force transmission element 16b. The force transmission elements 16a, 16b are designed to prevent mutual relative rotation while at the same time allowing setting in the height direction. For example, the first force transmission element 16a may, in a plane disposed transversely to it, be provided with a varying radial distance between its axis and its inside surface, which radial distance is constant in the longitudinal direction, while the second force transmission element 16b may be provided with an outside surface corresponding to the inside surface of the first force transmission element 16a.
When a user pulls the control means 15, corresponding pulling motion is transmitted to the wire 26, as illustrated in Fig. 8 by the arrow C. The wire 26 is wound about and connected to the first force transmission element 16a via the gearing means 25 so that pulling the wire 26 causes the first force transmission element 16a and hence the second force transmission element 16b to rotate about their axis, as illustrated by the arrow B. Alternatively, the wire 26 or other connecting device 17 may be connected directly to the first force transmission element 16a.
Connecting together the force transmission elements 16a, 16b to make mutual relative movement possible in the longitudinal direction and at the same time prevent mutual relative rotation can be achieved in a number of ways. One example is to use force transmission elements 16a, 16b in the form of square tubes, as described above. Alternatively, the force transmission elements 16a, 16b may take the form of tubes with at least three sides or some other desired number of sides. Alternatively, the force transmission elements 16a, 16b may be of oval profile, as depicted in Fig. 9. According to a further embodiment of the invention, the force transmission elements 16a, 16b are provided with a longitudinal protruding portion, e.g. a ridge or nib 28, and a longitudinal recess 29 for mutual engagement, as depicted in Fig. 10. The force transmission elements 16a, 16b in the embodiments depicted in Fig. 11 and Fig. 12 are provided with a plurality of such nibs 28 and respective corresponding recesses 29, thereby constituting a gearwheel formation.
According to a preferred embodiment of the invention, the force transmission elements 16a, 16b are connected together by a connecting element 30 as depicted in Fig. 13. The force transmission elements 16a, 16b run through recesses of the connecting element 30, whereby the force transmission elements 16a, 16b and the respective recesses are configured in the same way as described above in order to prevent mutual relative rotation while at the same time maintaining possibilities of setting in the height direction. For example, the force transmission elements 16a, 16b may be disposed substantially parallel, whereby the first force transmission element 16a is arranged for rotation about the axis of the second force transmission element 16b. This results at the same time in gearing by a lever effect.

Claims

1. A brake device for a walker (10), comprising a control means (15) connected movably to a brake (14) by at least one elongate force transmission element (16) and intended to regulate the braking effect of the brake (14) via the force transmission element (16), ch a ra c te ris e d in that the force transmission element (16) is adapted to rotating about an axis (A) running along it, in order to transmit a force, associated with a movement (C) of the control means, in the form of a rotary motion (B) about said axis (A).
2. A device according to claim 1 , whereby the brake device comprises an elongate first force transmission element (16a) and, connected to the latter, an elongate second force transmission element (16b), which are adapted to being movable along the axis (A) for height setting and being rotatable about the axis (A) for force transmission.
3. A device according to claim 2, whereby the force transmission elements (16a, 16b) are mutually connected together so that the rotary motion (B) is transmitted from the first force transmission element (16a) to the second force transmission element (16b).
4. A device according to claim 3, whereby the force transmission elements (16a, 16b) are mutually connected together by a torsionally rigid connection in order to prevent mutual relative rotation about the axis (A).
5. A device according to any one of claims 2-4, whereby the first force transmission element (16a) takes the form of a tube for accommodating the second force transmission element (16b), thereby constituting a telescopic function for height setting.
6. A device according to claim 5, whereby the first force transmission element (16a) is provided, in a plane disposed transversely to it, with a varying radial distance between its axis and its inside surface, which radial distance is constant in the longitudinal direction, and whereby the second force transmission element (16b) is provided with an outside surface corresponding to the inside surface of the first force transmission element (16a).
7. A device according to claim 6, whereby the first force transmission element (16a) takes the form of a square tube.
8. A device according to any one of the foregoing claims, whereby the control means (15) is connected to the force transmission element (16) by a connecting device (17) in the form of a wire (26) which is at least partly wound about a portion of the force transmission element (16) in order to subject the latter to rotation upon operation of the control means (15).
9. A device according to claim 8, whereby the wire (26) is connected to the force transmission element (16) via a gear element (25) in the form of a portion provided with a larger circumference than the force transmission element (16).
10. A device according to any one of the foregoing claims, whereby the force transmission element (16) is supported inside a frame portion (12a, 12b) of a walker (10) which extends between a wheel (11) and a handle (13).
11. A walker (10) comprising a brake device according to any one of the foregoing claims.
12. A walker (10) comprising a brake device according to any one of claims 2-10 whereby the walker (10) further comprises a first frame portion (12a) and, connected to the latter, a second frame portion (12b) settable in the height direction, which frame portions (12a, 12b) contain the force transmission elements (16a, 16b).
PCT/SE2006/000463 2005-04-20 2006-04-20 Brake device for walker and walker comprising the brake device WO2006112779A1 (en)

Applications Claiming Priority (2)

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SE0500880A SE528513C2 (en) 2005-04-20 2005-04-20 Braking device for walker and walker including brake device
SE0500880-0 2005-04-20

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WO2017035633A1 (en) * 2015-09-02 2017-03-09 Evolution Technologies Inc. Brake assembly for a height-adjustable walker apparatus
US9623888B2 (en) 2008-10-08 2017-04-18 Evolution Technologies Inc. Foldable walker apparatus
US9744094B2 (en) 2014-02-28 2017-08-29 Evolution Technologies Inc. Walker apparatus and backrest therefor
US10730489B2 (en) 2015-09-02 2020-08-04 Evolution Technologies Inc. Brake assembly for height-adjustable patient transport apparatus
US11648922B2 (en) 2015-09-02 2023-05-16 Evolution Technologies Inc. Manually-operated, height-adjustable wheeled vehicle, and a brake assembly and wheel fork assembly thereof

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US20020050697A1 (en) * 2000-09-12 2002-05-02 Bjarki Hallgrimsson Combination walker and transport chair
WO2004073578A1 (en) * 2003-02-24 2004-09-02 Dolomite Ab A walker device
US20050067804A1 (en) * 2003-09-30 2005-03-31 Ulf Tolfsen Walker with adjustable handlebar

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US20020050697A1 (en) * 2000-09-12 2002-05-02 Bjarki Hallgrimsson Combination walker and transport chair
WO2004073578A1 (en) * 2003-02-24 2004-09-02 Dolomite Ab A walker device
US20050067804A1 (en) * 2003-09-30 2005-03-31 Ulf Tolfsen Walker with adjustable handlebar

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9623888B2 (en) 2008-10-08 2017-04-18 Evolution Technologies Inc. Foldable walker apparatus
US9744094B2 (en) 2014-02-28 2017-08-29 Evolution Technologies Inc. Walker apparatus and backrest therefor
WO2017035633A1 (en) * 2015-09-02 2017-03-09 Evolution Technologies Inc. Brake assembly for a height-adjustable walker apparatus
US10053062B2 (en) 2015-09-02 2018-08-21 Evolution Technologies Inc. Brake assembly for a height-adjustable walker apparatus
US10730489B2 (en) 2015-09-02 2020-08-04 Evolution Technologies Inc. Brake assembly for height-adjustable patient transport apparatus
US11220246B2 (en) 2015-09-02 2022-01-11 Evolution Technologies Inc. Brake assembly for height-adjustable patient transport apparatus
US11648922B2 (en) 2015-09-02 2023-05-16 Evolution Technologies Inc. Manually-operated, height-adjustable wheeled vehicle, and a brake assembly and wheel fork assembly thereof

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SE528513C2 (en) 2006-12-05

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