CA1209516A - Wheelchair tilting device - Google Patents
Wheelchair tilting deviceInfo
- Publication number
- CA1209516A CA1209516A CA000423989A CA423989A CA1209516A CA 1209516 A CA1209516 A CA 1209516A CA 000423989 A CA000423989 A CA 000423989A CA 423989 A CA423989 A CA 423989A CA 1209516 A CA1209516 A CA 1209516A
- Authority
- CA
- Canada
- Prior art keywords
- frame
- screw
- nut
- occupant
- wheelchair
- Prior art date
- Legal status (The legal status 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 status listed.)
- Expired
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Abstract
"WHEELCHAIR TILTING DEVICE"
ABSTRACT OF THE DISCLOSURE
A tilting device for a wheelchair and occupant comprises an outer frame defining a base and upstanding triangular supports at an inner frame pivotally mounted on the outer frame at the top of the triangular supports.
The inner frame comprises a back rest and platform with a rearwardly extending section to receive the wheels of the wheelchair and parallel guides spaced by the width of the wheelchair to prevent twisting. The pivot axis passes through the occupant and the inner frame can be pivoted re-lative to the outer frame by operation of a handle which rotates a screw, axial movement of which acts to pivot the inner frame by actuation of suitable levers.
ABSTRACT OF THE DISCLOSURE
A tilting device for a wheelchair and occupant comprises an outer frame defining a base and upstanding triangular supports at an inner frame pivotally mounted on the outer frame at the top of the triangular supports.
The inner frame comprises a back rest and platform with a rearwardly extending section to receive the wheels of the wheelchair and parallel guides spaced by the width of the wheelchair to prevent twisting. The pivot axis passes through the occupant and the inner frame can be pivoted re-lative to the outer frame by operation of a handle which rotates a screw, axial movement of which acts to pivot the inner frame by actuation of suitable levers.
Description
5~;
"WHEELCHAIR TILTING DEVICE"
BACKGROUND OF THE INVENTION
_ _ _ __ __ _ _ _ _ _ This invention relates to a device for tilting wheelchairs rearwardly to allow the occupant to attain a rearwardly inclined position.
Devices of this sort are necessary for various reasons to allow the occupant to be tilted rearwardly with-out the necessity of removing the occupant from the wheel-chair and placing him or her in a separate chair which can be reclined. It îs necessary for the device to be simply manually operable with assistance from a healthy person or usually one who is trained thus allowing the occupant to assume the reclined position and at the same time provide the occupant with the possibility of self operation as well.
_MMARY OF THE INVENTION___ _ ________ _ ___ It is one object of the invention therefore to provide a simple device for tilting a wheelchair and occu-pant rearwardly while maintaining the wheel chair safely secured during the tilting movement.
Accordingly the invention provides an apparatus for tilting a wheelchair and occupant backwardly compris-ing a first frame having two spaced parallel side frame portions defining a base for mounting on the floor and a transverse pivot axis extending between said side frame portions, a second frame, means mounting the second frame on the first frame inwardly of said side frame portions so ~ .
as to be pivotally movable thereon about said pivot axis from a first position to a second position angularly rotat-ed from the first position and manually operable means for rotating the second frame between the first and second positions, the second frame including a substantially hor-izontal platform for receiving the wheels of the wheelchair a pair of spaced side frame members each arranged inwardly of and adjacent to a respective side frame portion with the platform extending therebetween and an upstanding back support portion rearward of said side frame members for supporting the rear of the chair and the back of the occu-pant in the second position said mounting means including pivot coupling means for coupling said side frame members to said side frame portions such that the pivot axis is arranged forwardly of the back support portion and the platform is normally raised from the ground whereby the second frame can pivot without movement thereof.
According to one advantage of the invention the first frame is triangular and provides a pivot axis for the second frame raised from the floor by the triangular first frame so the pivot axis passes substantially through the occupant approximately at the center of gravity of the chair and occupant. In this way little effort is necessary to tilt the occupant and chair and also the occupant feels secure during the tilting movement since his center of gravity is not moved vigorously rearwardly in order to at-~P~$5~i tain the tilting movement.
According to aifurther advantage of the invention the device for actuating the movement comprises a manually operable handle and attached screw so that the patient or occupant can himself readily attain the til.ted position without the assistance of a skilled healthy operative.
According to a yet further advantage the second frame includes a platform and ramp for readily receiving the wheels of the wheelchair while in the untilted position and also a rearwardly extending frame portion supporting wheel guides confining the whee,s and chair onto the plat-form.
With the foregoing in view, and other advantages as will become apparent to those ski.lled i.n the art to which this invention relates as this specification pro-ceeds, the invention is herein described by reference to the accompanying drawings forming a part hereof, which in-cludes a description of the best mode known to the appli-cant and of the preferred typical embodiment of the prin-ciples of the present invention, in which:
DESCRIPTION OF THE DRAT~INGS
_____._____.________ Figure l is a side elevational view of a wheel-chair tilt apparatus in the first or untilted position.
Figure 2 is a plan view of the apparatus of Figure l.
Figure 3 is a front view of the apparatus of ~ d~6 Figure 1.
Figure 4 is a side view similar to that of Figure 1 showing the apparatus in the tilted position and includ-ing a wheelchair accommodated on the apparatus and tilted 5 thereby.
In the drawings like characters of reference in-dicate corresponding parts in the different figures.
DET_ILED DESCRIPTION
The wheelchair tilting apparatus comprises a first frame having two side frame portions 10 and 11 each of which comprises a substantially triangular frame defin-ed by legs 101 and 102 and cross member 103. The legs 101 and 102 extend substantially to an apex at the upper end closed by a cross member 104. The two side frames 10 and 11 are interconnected by cross members 105, 106 connecting with the legs 101, 102 respectively adjacent the junction thereof with the cross member 103. In this way a rigid rectangular base is formed for resting upon the floor and extending upwardly to define a support at the apex.
The second frame comprises a platform 20 formed by a sheet metal pan with upstanding sides 21, 22. At the front of the platform 20 is pivotally mounted a ramp 23 on a hinge 24 which extends from the front edge of the plat-form 20 to the floor to allow a wheelchair to be readily rolled onto the platform 20.
The platform 20 supported on cross members 25, ~.%'~$~S~
26 extending transversely beneath the platform 20 is con-nected to upstanding side frame portions 28, 27 respective-ly. The side frame portions 28 extend upwardly at the rear of the platform 50 as to define a back rest intercon-nected by a top cross member 29 of the same width as the platform 20. The side frame portions 27 extend upwardly and rearwardly from the platform toward the portions 28 and are interconnected thereto by a rearwardly extending portion 30.
A flange 31 extending across the corner between the portions 30 and 27 provides a support for receiving a pivot pin 32 extending inwardly from the cross mernber 104 of the fixed Eirst Erame. In this way the whole of the second frame is pivotal about a horizontal axis defined by the pivot pins 32.
The second pivotal frame further includes down-wardly extending frame portions 33 which lie in the same plane as the portions 28 and 29 and which are intercon-nected by a cross member 34. Extending rearwardly from the cross member 34 at the same width as the portions 33 are two further frame portions 35 which extend rearwardly and downwardly toward a cross member 36 extending the full width of the second frame. The cross member 36 is inter-connected to the downwardly depending portions 28 by fur-ther portions 37 which are shown in Figure 1 lie at an angle to the downwardly depending portion 35.
`` ~l2'!;~$5 ~6 Guide bars 38 are connected at one end to the cross member 35 and the next end forwardly and parallel to a position adjacent the front of the second frame where they curve outwardly to be connected to the frame 27.
S Thus the guides 38 are parallel and spaced by a distance substantially equal to the outside of the wheels of a wheelchair so that they can act as guides to limit the movement of the wheelchair sidewardly on the frame to pro-tect the hands of the wheelchair occupant and to ensure that it is prevented from twisting on the platform 20.
The pivot pin 32 on one side of the frame, is extended beyond the fixed frame side to provide a block 40 which is an integral part of the pin 32. The block 40 acts as a guide for a shaft.
~l2~
39 whicn is free to rotate in the block 40 but is prevent-ed ~rom axial movement relative thereto by a collar 41 and by a handle 42 both of which are fixed to the shaft 39.
The handle 42 includes a manually operable crank 43 which can be used to rotate the shaft 39 in the block 40. The other end of the shaft 39 includes a screw 44 carrying a nut 45 so that rotation of the shaft 39 acts to move the nut axia~ly o~ the shaft with a large mechanical advantage being provided by the crank 43.
The nut 45 is connected to a lever 46 which is bifurcated so as to prevent rotational movement of the nut 45 about the shaft 39 and is rigidly connected to a further lever 47 at a fixed angle thereto. The lever 46, 47 is pivotally mounted on a flange 48 by a pivot 49 so that axial movement of the nut 45 acts to pivot the lever 4~, 47 about the pivot 49 thus moving the other end of the lever portion 47 angularly about the pivot 49.
The ~lange 48 is mounted on the fixed first frame at the corner between the cross member 103 and leg 101.
The other end of the lever 47 is attached to the movable inner frame by a further lever 50 pivotally mounted at one end to the lever 47 a~d the other end to the frame portion 28. A comparison of the positions of the inner frame shown in Figures 1 and 4 will show that the axial movement of the nut 45 has caused the inner frame to pivot in an anticlock-wise direction about the pivot pins 32. Twisting of the second or inner frame is avoided by communicating movement of the nut 45 to a further lever system 47,50 at the other side of the frame by a torsion bar 51 extending from one side to the other side.
The wheelchair including the occupant can there-fore be wheeled up the ramp 23 onto the platform 20 by the occupant himself or by an assistant. The guides 38 act to direct the wheelchair onto the platform and prevent any twisting movement until the back of the wheelchair contacts the rear frame defined by the portions 28 and 29. For the comfort of the occupant a padded section 52 is applied to the rear frame and attached to the rectangle defined by the cross member 29 and the portions 33, 34.
In this position the wheels extend rearwardly through the rear frame defined by the members 28, 29 to a position in contact with the cross member 36 so the chair is held rigidly in position by the padding 52, the platforrn 20, the cross member 36 and the guides 38. In this posi-tion the occupant and chair therefore are securely held.
In this position the occupant himself or an assis-tant can operate the handle 43 to move the nut 45 downward-ly on the shaf~ 39 which acts to move the inner frame in an anticlockwise direction to the position shown in Figure 4. It will be appreciated that the pivot axis passing tnrough the pins 32 passes through the occupant and lies approximately at the center of gravity of the occupant and 5~6 chair so the occupant does not experience a disturbing move-ment of his center of gravity. With the wheelchair and occupant tilted as shown in Figure 4 the occupant can re-lax thus varying tne loads on his body and reducing dis-comfort from sitting too long in one position. In addition in the reclined position the occupant can be examined or can nave other a~tention applied. The operation of the tilting device can be carried out either by the occupant himself or by an assistant and hence the occupant can him-self move to the til~ed position without calling for assis-tance without any danger of overtilting or the chair leav-ing its proper securement on the tilting device.
To provide a pleasing appearance and to provide a framework which is rigid and able to support the forces involved, the first and second frames are formed from tubular steel wnich is chrome plated. The cross section of the tube is square to assist in ~ne assembly generally by welding of the parts.
Since various modifications can be made in our in-vention as hereinabove described, and many apparently widely different ~mbodiments of same made within the spirit and scope of the claims without departing from such spirit and scope, it is intended that all matter contained in the ac-companying specification shall be interpreted as illustra-tive only and not in a limiting sense.
"WHEELCHAIR TILTING DEVICE"
BACKGROUND OF THE INVENTION
_ _ _ __ __ _ _ _ _ _ This invention relates to a device for tilting wheelchairs rearwardly to allow the occupant to attain a rearwardly inclined position.
Devices of this sort are necessary for various reasons to allow the occupant to be tilted rearwardly with-out the necessity of removing the occupant from the wheel-chair and placing him or her in a separate chair which can be reclined. It îs necessary for the device to be simply manually operable with assistance from a healthy person or usually one who is trained thus allowing the occupant to assume the reclined position and at the same time provide the occupant with the possibility of self operation as well.
_MMARY OF THE INVENTION___ _ ________ _ ___ It is one object of the invention therefore to provide a simple device for tilting a wheelchair and occu-pant rearwardly while maintaining the wheel chair safely secured during the tilting movement.
Accordingly the invention provides an apparatus for tilting a wheelchair and occupant backwardly compris-ing a first frame having two spaced parallel side frame portions defining a base for mounting on the floor and a transverse pivot axis extending between said side frame portions, a second frame, means mounting the second frame on the first frame inwardly of said side frame portions so ~ .
as to be pivotally movable thereon about said pivot axis from a first position to a second position angularly rotat-ed from the first position and manually operable means for rotating the second frame between the first and second positions, the second frame including a substantially hor-izontal platform for receiving the wheels of the wheelchair a pair of spaced side frame members each arranged inwardly of and adjacent to a respective side frame portion with the platform extending therebetween and an upstanding back support portion rearward of said side frame members for supporting the rear of the chair and the back of the occu-pant in the second position said mounting means including pivot coupling means for coupling said side frame members to said side frame portions such that the pivot axis is arranged forwardly of the back support portion and the platform is normally raised from the ground whereby the second frame can pivot without movement thereof.
According to one advantage of the invention the first frame is triangular and provides a pivot axis for the second frame raised from the floor by the triangular first frame so the pivot axis passes substantially through the occupant approximately at the center of gravity of the chair and occupant. In this way little effort is necessary to tilt the occupant and chair and also the occupant feels secure during the tilting movement since his center of gravity is not moved vigorously rearwardly in order to at-~P~$5~i tain the tilting movement.
According to aifurther advantage of the invention the device for actuating the movement comprises a manually operable handle and attached screw so that the patient or occupant can himself readily attain the til.ted position without the assistance of a skilled healthy operative.
According to a yet further advantage the second frame includes a platform and ramp for readily receiving the wheels of the wheelchair while in the untilted position and also a rearwardly extending frame portion supporting wheel guides confining the whee,s and chair onto the plat-form.
With the foregoing in view, and other advantages as will become apparent to those ski.lled i.n the art to which this invention relates as this specification pro-ceeds, the invention is herein described by reference to the accompanying drawings forming a part hereof, which in-cludes a description of the best mode known to the appli-cant and of the preferred typical embodiment of the prin-ciples of the present invention, in which:
DESCRIPTION OF THE DRAT~INGS
_____._____.________ Figure l is a side elevational view of a wheel-chair tilt apparatus in the first or untilted position.
Figure 2 is a plan view of the apparatus of Figure l.
Figure 3 is a front view of the apparatus of ~ d~6 Figure 1.
Figure 4 is a side view similar to that of Figure 1 showing the apparatus in the tilted position and includ-ing a wheelchair accommodated on the apparatus and tilted 5 thereby.
In the drawings like characters of reference in-dicate corresponding parts in the different figures.
DET_ILED DESCRIPTION
The wheelchair tilting apparatus comprises a first frame having two side frame portions 10 and 11 each of which comprises a substantially triangular frame defin-ed by legs 101 and 102 and cross member 103. The legs 101 and 102 extend substantially to an apex at the upper end closed by a cross member 104. The two side frames 10 and 11 are interconnected by cross members 105, 106 connecting with the legs 101, 102 respectively adjacent the junction thereof with the cross member 103. In this way a rigid rectangular base is formed for resting upon the floor and extending upwardly to define a support at the apex.
The second frame comprises a platform 20 formed by a sheet metal pan with upstanding sides 21, 22. At the front of the platform 20 is pivotally mounted a ramp 23 on a hinge 24 which extends from the front edge of the plat-form 20 to the floor to allow a wheelchair to be readily rolled onto the platform 20.
The platform 20 supported on cross members 25, ~.%'~$~S~
26 extending transversely beneath the platform 20 is con-nected to upstanding side frame portions 28, 27 respective-ly. The side frame portions 28 extend upwardly at the rear of the platform 50 as to define a back rest intercon-nected by a top cross member 29 of the same width as the platform 20. The side frame portions 27 extend upwardly and rearwardly from the platform toward the portions 28 and are interconnected thereto by a rearwardly extending portion 30.
A flange 31 extending across the corner between the portions 30 and 27 provides a support for receiving a pivot pin 32 extending inwardly from the cross mernber 104 of the fixed Eirst Erame. In this way the whole of the second frame is pivotal about a horizontal axis defined by the pivot pins 32.
The second pivotal frame further includes down-wardly extending frame portions 33 which lie in the same plane as the portions 28 and 29 and which are intercon-nected by a cross member 34. Extending rearwardly from the cross member 34 at the same width as the portions 33 are two further frame portions 35 which extend rearwardly and downwardly toward a cross member 36 extending the full width of the second frame. The cross member 36 is inter-connected to the downwardly depending portions 28 by fur-ther portions 37 which are shown in Figure 1 lie at an angle to the downwardly depending portion 35.
`` ~l2'!;~$5 ~6 Guide bars 38 are connected at one end to the cross member 35 and the next end forwardly and parallel to a position adjacent the front of the second frame where they curve outwardly to be connected to the frame 27.
S Thus the guides 38 are parallel and spaced by a distance substantially equal to the outside of the wheels of a wheelchair so that they can act as guides to limit the movement of the wheelchair sidewardly on the frame to pro-tect the hands of the wheelchair occupant and to ensure that it is prevented from twisting on the platform 20.
The pivot pin 32 on one side of the frame, is extended beyond the fixed frame side to provide a block 40 which is an integral part of the pin 32. The block 40 acts as a guide for a shaft.
~l2~
39 whicn is free to rotate in the block 40 but is prevent-ed ~rom axial movement relative thereto by a collar 41 and by a handle 42 both of which are fixed to the shaft 39.
The handle 42 includes a manually operable crank 43 which can be used to rotate the shaft 39 in the block 40. The other end of the shaft 39 includes a screw 44 carrying a nut 45 so that rotation of the shaft 39 acts to move the nut axia~ly o~ the shaft with a large mechanical advantage being provided by the crank 43.
The nut 45 is connected to a lever 46 which is bifurcated so as to prevent rotational movement of the nut 45 about the shaft 39 and is rigidly connected to a further lever 47 at a fixed angle thereto. The lever 46, 47 is pivotally mounted on a flange 48 by a pivot 49 so that axial movement of the nut 45 acts to pivot the lever 4~, 47 about the pivot 49 thus moving the other end of the lever portion 47 angularly about the pivot 49.
The ~lange 48 is mounted on the fixed first frame at the corner between the cross member 103 and leg 101.
The other end of the lever 47 is attached to the movable inner frame by a further lever 50 pivotally mounted at one end to the lever 47 a~d the other end to the frame portion 28. A comparison of the positions of the inner frame shown in Figures 1 and 4 will show that the axial movement of the nut 45 has caused the inner frame to pivot in an anticlock-wise direction about the pivot pins 32. Twisting of the second or inner frame is avoided by communicating movement of the nut 45 to a further lever system 47,50 at the other side of the frame by a torsion bar 51 extending from one side to the other side.
The wheelchair including the occupant can there-fore be wheeled up the ramp 23 onto the platform 20 by the occupant himself or by an assistant. The guides 38 act to direct the wheelchair onto the platform and prevent any twisting movement until the back of the wheelchair contacts the rear frame defined by the portions 28 and 29. For the comfort of the occupant a padded section 52 is applied to the rear frame and attached to the rectangle defined by the cross member 29 and the portions 33, 34.
In this position the wheels extend rearwardly through the rear frame defined by the members 28, 29 to a position in contact with the cross member 36 so the chair is held rigidly in position by the padding 52, the platforrn 20, the cross member 36 and the guides 38. In this posi-tion the occupant and chair therefore are securely held.
In this position the occupant himself or an assis-tant can operate the handle 43 to move the nut 45 downward-ly on the shaf~ 39 which acts to move the inner frame in an anticlockwise direction to the position shown in Figure 4. It will be appreciated that the pivot axis passing tnrough the pins 32 passes through the occupant and lies approximately at the center of gravity of the occupant and 5~6 chair so the occupant does not experience a disturbing move-ment of his center of gravity. With the wheelchair and occupant tilted as shown in Figure 4 the occupant can re-lax thus varying tne loads on his body and reducing dis-comfort from sitting too long in one position. In addition in the reclined position the occupant can be examined or can nave other a~tention applied. The operation of the tilting device can be carried out either by the occupant himself or by an assistant and hence the occupant can him-self move to the til~ed position without calling for assis-tance without any danger of overtilting or the chair leav-ing its proper securement on the tilting device.
To provide a pleasing appearance and to provide a framework which is rigid and able to support the forces involved, the first and second frames are formed from tubular steel wnich is chrome plated. The cross section of the tube is square to assist in ~ne assembly generally by welding of the parts.
Since various modifications can be made in our in-vention as hereinabove described, and many apparently widely different ~mbodiments of same made within the spirit and scope of the claims without departing from such spirit and scope, it is intended that all matter contained in the ac-companying specification shall be interpreted as illustra-tive only and not in a limiting sense.
Claims
CLAIMS:
(1) Apparatus for tilting a wheelchair and occu-pant backwardly comprising a first frame having two spaced parallel side frame portions defining a base for mounting on the floor and a transverse pivot axis extending between said side frame portions, a second frame, means mounting the second frame on the first frame inwardly of said side frame portions so as to be pivotally movable thereon about said pivot axis from a first position to a second position angularly rotated from the first position and manually operable means for rotating the second frame between the first and second positions, the second frame including a substantially horizontal platform for receiving the wheels of the wheelchair a pair of spaced side frame members each arranged inwardly of and adjacent to a respective side frame portion with the platform extending therebetween and an upstanding back support portion rearward of said side frame members for supporting the rear of the chair and the back of the occupant in the second position said mounting means including pivot coupling means for coupling said side frame members to said side frame portions such that the pivot axis is arranged forwardly of the back support portion and the platform is normally raised from the ground whereby the second frame can pivot without movement there-of.
(2) Apparatus according to Claim 1 wherein the second frame includes a wheel receiving portion extending rearwardly of said back support portion and said platform and inwardly of said side frame members.
(3) Apparatus according to Claim 1 wherein the first frame has two sides each of which is substantially triangular extending upwardly from the base to an apex and wherein the pivot coupling is arranged at the apex such that the pivot axis passes substantially through the apex.
(4) Apparatus according to Claim 1, wherein the mounting means is arranged such that the pivot axis passes through the occupant.
(5) Apparatus according to Claim 3 wherein the mounting means is arranged such that the pivot axis passes through the occupant.
(6) Apparatus according to Claim 4 wherein the pivot axis passes through substantially the center of gravity of the occupant and chair.
(7) Apparatus according to Claim 4 or 5 wherein the pivot axis passes through substantially the center of gravity of the occupant and chair.
(8) Apparatus according to Claim 2 or 3 wherein the second frame includes a pair of guide bars extending in parallel relationship and spaced so as to guide the outside edges of the wheels of the wheelchair.
(9) Apparatus according to Claim 4 or 5 wherein the second frame includes a pair of guide bars extending in parallel relationship and spaced so as to guide the outside edges of the wheels of the wheelchair.
(10) Apparatus according to Claim 1, 2 or 3 wherein the manually operable means comprises a screw, means mounting the screw for rotation about its axis in axially fixed location, a manually operable handle attach-ed to the screw for rotation thereof, a floating nut mount-ed on the screw for axial movement relative thereto and a lever attached to the nut for communicating axial movement of the nut to the second frame.
(11) Apparatus according to Claim 4 or 5 wherein the manually operable means comprises a screw, means mounting the screw for rotation about its axis in axially fixed location, a manually operable handle attach-ed to the screw for rotation thereof, a floating nut mount-ed on the screw for axial movement relative thereto and a lever attached to the nut for communicating axial movement of the nut to the second frame.
(12) Apparatus according to Claim 1, 2 or 3 wherein the manually operable means comprises a screw, means mounting the screw for rotation about its axis in axially fixed location, a manually operable handle attach-ed to the screw for rotation thereof, a floating nut mount-ed on the screw for axial movement relative thereto and a lever attached to the nut for communicating axial movement of the nut to the second frame and wherein the lever is pivotally mounted on the first frame.
(13) Apparatus according to Claim 4 or 5 wherein the manually operable means comprises a screw, means mounting the screw for rotation about its axis in axially fixed location, a manually operable handle attach-ed to the screw for rotation thereof, a floating nut mount-ed on the screw for axial movement relative thereto and a lever attached to the nut for communicating axial movement of the nut to the second frame and wherein the lever is pivotally mounted on the first frame.
(14) Apparatus according to Claim 1, 2 or 3 wherein the lever is mounted adjacent one side of the first frame and there is provided a torsion bar for com-municating movement thereof to a second similar lever ad-jacent the opposite side of the first frame.
(15) Apparatus according to Claim 4 or 5 wherein the lever is mounted adjacent one side of the first frame and there is provided a torsion bar for com-municating movement thereof to a second similar lever ad-jacent the opposite side of the first frame.
(16) Apparatus according to Claim 1, 2 or 3 wherein the first and second frames are manufactured from tubular members.
(17) Apparatus according to Claim 4 or 5 wherein the first and second frames are manufactured from tubular members.
(1) Apparatus for tilting a wheelchair and occu-pant backwardly comprising a first frame having two spaced parallel side frame portions defining a base for mounting on the floor and a transverse pivot axis extending between said side frame portions, a second frame, means mounting the second frame on the first frame inwardly of said side frame portions so as to be pivotally movable thereon about said pivot axis from a first position to a second position angularly rotated from the first position and manually operable means for rotating the second frame between the first and second positions, the second frame including a substantially horizontal platform for receiving the wheels of the wheelchair a pair of spaced side frame members each arranged inwardly of and adjacent to a respective side frame portion with the platform extending therebetween and an upstanding back support portion rearward of said side frame members for supporting the rear of the chair and the back of the occupant in the second position said mounting means including pivot coupling means for coupling said side frame members to said side frame portions such that the pivot axis is arranged forwardly of the back support portion and the platform is normally raised from the ground whereby the second frame can pivot without movement there-of.
(2) Apparatus according to Claim 1 wherein the second frame includes a wheel receiving portion extending rearwardly of said back support portion and said platform and inwardly of said side frame members.
(3) Apparatus according to Claim 1 wherein the first frame has two sides each of which is substantially triangular extending upwardly from the base to an apex and wherein the pivot coupling is arranged at the apex such that the pivot axis passes substantially through the apex.
(4) Apparatus according to Claim 1, wherein the mounting means is arranged such that the pivot axis passes through the occupant.
(5) Apparatus according to Claim 3 wherein the mounting means is arranged such that the pivot axis passes through the occupant.
(6) Apparatus according to Claim 4 wherein the pivot axis passes through substantially the center of gravity of the occupant and chair.
(7) Apparatus according to Claim 4 or 5 wherein the pivot axis passes through substantially the center of gravity of the occupant and chair.
(8) Apparatus according to Claim 2 or 3 wherein the second frame includes a pair of guide bars extending in parallel relationship and spaced so as to guide the outside edges of the wheels of the wheelchair.
(9) Apparatus according to Claim 4 or 5 wherein the second frame includes a pair of guide bars extending in parallel relationship and spaced so as to guide the outside edges of the wheels of the wheelchair.
(10) Apparatus according to Claim 1, 2 or 3 wherein the manually operable means comprises a screw, means mounting the screw for rotation about its axis in axially fixed location, a manually operable handle attach-ed to the screw for rotation thereof, a floating nut mount-ed on the screw for axial movement relative thereto and a lever attached to the nut for communicating axial movement of the nut to the second frame.
(11) Apparatus according to Claim 4 or 5 wherein the manually operable means comprises a screw, means mounting the screw for rotation about its axis in axially fixed location, a manually operable handle attach-ed to the screw for rotation thereof, a floating nut mount-ed on the screw for axial movement relative thereto and a lever attached to the nut for communicating axial movement of the nut to the second frame.
(12) Apparatus according to Claim 1, 2 or 3 wherein the manually operable means comprises a screw, means mounting the screw for rotation about its axis in axially fixed location, a manually operable handle attach-ed to the screw for rotation thereof, a floating nut mount-ed on the screw for axial movement relative thereto and a lever attached to the nut for communicating axial movement of the nut to the second frame and wherein the lever is pivotally mounted on the first frame.
(13) Apparatus according to Claim 4 or 5 wherein the manually operable means comprises a screw, means mounting the screw for rotation about its axis in axially fixed location, a manually operable handle attach-ed to the screw for rotation thereof, a floating nut mount-ed on the screw for axial movement relative thereto and a lever attached to the nut for communicating axial movement of the nut to the second frame and wherein the lever is pivotally mounted on the first frame.
(14) Apparatus according to Claim 1, 2 or 3 wherein the lever is mounted adjacent one side of the first frame and there is provided a torsion bar for com-municating movement thereof to a second similar lever ad-jacent the opposite side of the first frame.
(15) Apparatus according to Claim 4 or 5 wherein the lever is mounted adjacent one side of the first frame and there is provided a torsion bar for com-municating movement thereof to a second similar lever ad-jacent the opposite side of the first frame.
(16) Apparatus according to Claim 1, 2 or 3 wherein the first and second frames are manufactured from tubular members.
(17) Apparatus according to Claim 4 or 5 wherein the first and second frames are manufactured from tubular members.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000423989A CA1209516A (en) | 1983-03-18 | 1983-03-18 | Wheelchair tilting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000423989A CA1209516A (en) | 1983-03-18 | 1983-03-18 | Wheelchair tilting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1209516A true CA1209516A (en) | 1986-08-12 |
Family
ID=4124827
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000423989A Expired CA1209516A (en) | 1983-03-18 | 1983-03-18 | Wheelchair tilting device |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1209516A (en) |
-
1983
- 1983-03-18 CA CA000423989A patent/CA1209516A/en not_active Expired
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| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |