CN216933786U - Backrest folding joint for wheelchair - Google Patents

Abstract

The utility model relates to the technical field of wheelchairs and discloses a backrest folding joint for a wheelchair, which comprises a rotating assembly connected with a backrest frame of the wheelchair and a fixing assembly connected with a seat frame of the wheelchair, wherein the rotating assembly is rotationally connected with the fixing assembly through a first shaft pin, a clamping piece is elastically and rotationally arranged on the rotating assembly, a clamping groove is formed in the bottom of the clamping piece, a second shaft pin in clamping fit with the clamping groove is fixedly arranged on the fixing assembly, a third shaft pin is fixedly arranged on the clamping piece, a limiting plate is fixedly arranged on the fixing assembly, and the limiting plate is positioned between the fixing assembly and the rotating assembly. The backrest folding joint for the wheelchair can lock the wheelchair in a folding state, so that the backrest frame and the seat frame cannot rotate relatively, the condition that the wheelchair stretches cannot occur when the folded wheelchair is transported, and the moving and transporting work of the wheelchair cannot be influenced.

Description

Backrest folding joint for wheelchair

Technical Field

The utility model relates to the technical field of wheelchairs, in particular to a backrest folding joint for a wheelchair.

Background

The wheel chair is an important moving tool for home rehabilitation, turnover transportation, treatment and outing activities of wounded persons, patients and disabled persons, and is divided into an electric folding wheel chair and a manual folding wheel chair. The manual folding wheelchair mainly comprises a foldable frame, a backrest, a seat, front wheels, rear wheels and the like, wherein the foldable frame comprises a backrest frame used for installing the backrest and a seat frame used for installing the seat, the backrest and the seat can be folded by folding joints, and the folded wheelchair is convenient to store.

For example, the chinese utility model patent with the application number CN201721540475.5 and the publication number CN208492532U entitled "a fast folding and unfolding type electric leisure wheelchair" discloses a folding and unfolding device, wherein when folding, a pressing wrench of the folding and unfolding device is pulled upwards to drive a hand-pulling rotating shaft to rotate, and the hand-pulling rotating shaft drives a fixed hook to be upwards overturned to be separated from a fixed shaft, so as to realize folding; when the telescopic rod extends, the left connecting rod and the right connecting rod are rotated to be parallel through the main shaft, and at the moment, the clamping hook end of the fixed clamping hook is fixedly clamped on the fixed shaft to realize extending locking. Folding and extension of the wheelchair are realized through the folding and unfolding device, screw fixation is not needed, and the operation is more convenient and faster.

Above-mentioned utility model patent though can realize folding fast and the extension to the wheelchair, but owing to fixed pothook breaks away from with the fixed axle after folding, only rotate through the main shaft between left connecting rod and the right connecting rod this moment and be connected for can rotate at will between left connecting rod and the right connecting rod, when the wheelchair under the folded state moves and carries, make easily and take place relative rotation between left connecting rod and the right connecting rod, thereby cause the condition that the wheelchair under the folded state appears extending, the influence moves and carries work.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a backrest folding joint for a wheelchair, which aims to solve the technical problem that the wheelchair in a folded state is easy to extend to influence the transportation when the wheelchair in the folded state is transported in the prior art.

In order to achieve the above purpose, the utility model provides the following technical scheme: the utility model provides a back folding joint for wheelchair, includes the runner assembly that is connected with the back frame of wheelchair and the fixed subassembly that is connected with the seat frame of wheelchair, the runner assembly rotates through first pivot with fixed subassembly to be connected, the last elasticity of runner assembly rotates and is provided with joint spare, the bottom of joint spare is equipped with the joint groove, fixed mounting has the second axle round pin with joint groove joint complex on the fixed subassembly, fixed mounting has the third pivot on the joint spare, fixed mounting has the limiting plate on the fixed subassembly, the limiting plate is located between fixed subassembly and the runner assembly, seted up on the limiting plate with third axle round pin joint complex spacing groove, during the state of extension, second axle round pin and joint groove joint, during fold condition, third pivot and spacing groove joint.

Foretell back folding joint for wheelchair, runner assembly includes spliced pole and two lower connecting plates that set up relatively, spliced pole and two lower connecting plate fixed connection, two be provided with the space down between the connecting plate, joint spare elasticity rotates the setting and is in the space.

According to the backrest folding joint for the wheelchair, the clamping piece is rotationally connected with the two lower connecting plates through the fourth shaft pins, the bottom of the two lower connecting plates is symmetrically provided with the placing grooves, the springs are placed in the two placing grooves, the end portions of the springs are provided with the balls, the diameters of the balls are larger than those of the springs, and the bottoms of the balls slide and extrude the side edges of the clamping piece.

According to the backrest folding joint for the wheelchair, the two lower connecting plates are provided with the fourth positioning holes, the clamping piece is provided with the fifth positioning hole corresponding to the fourth positioning hole, and the fourth shaft pin is inserted into the fourth positioning hole and the fifth positioning hole.

Foretell back folding joint for wheelchair, the regulating plate is installed to detachably on the fixed subassembly, set up the first locating hole and a plurality of fixed orifices that supply the second axle round pin to pass on the regulating plate, it is a plurality of distance between fixed orifices and the first locating hole is different, set up on the fixed subassembly and supply the second axle round pin to pass and dodge the hole, it is long arc to dodge the hole.

According to the backrest folding joint for the wheelchair, the fixing component is provided with the first screw hole corresponding to the first fixing hole, and the first screw hole is screwed with the first screw penetrating through the first fixing hole.

According to the backrest folding joint for the wheelchair, the limiting plate is provided with the second fixing hole, the fixing assembly is provided with the second screw hole corresponding to the second fixing hole, and the second screw hole is connected with the second screw penetrating through the second fixing hole in a threaded manner.

According to the backrest folding joint for the wheelchair, the fixing assembly is provided with the sixth positioning hole, the limiting plate is provided with the second positioning hole corresponding to the sixth positioning hole, the two lower connecting plates are provided with the third positioning holes corresponding to the second positioning hole, and the first shaft pin penetrates through the third positioning hole, the second positioning hole and the sixth positioning hole.

In the backrest folding joint for the wheelchair, the fixing piece for fixing the first shaft pin and the second shaft pin is connected between the end part of the first shaft pin and the end part of the second shaft pin.

In the technical scheme, the backrest folding joint for the wheelchair, provided by the utility model, has the advantages that the second shaft pin and the clamping groove which are in clamping fit, and the third shaft pin and the limiting groove which are in clamping fit are arranged, so that the second shaft pin and the clamping groove are clamped when the wheelchair is in an extending state, and the third shaft pin and the limiting groove are separated, so that the backrest frame and the seat frame of the wheelchair are separated firmly at a certain angle; when the wheelchair is in a folded state, the third shaft pin is clamped with the limiting groove, and the second shaft pin is separated from the clamping groove, so that the backrest frame and the seat frame of the wheelchair are stably folded. Compared with the prior art, the backrest folding joint for the wheelchair can lock the wheelchair in a folded state, so that the backrest frame and the seat frame cannot rotate relatively, the condition of extending the wheelchair cannot occur when the folded wheelchair is transported, the moving and transporting work of the wheelchair cannot be influenced, and the defects in the prior art can be effectively overcome.

Drawings

In order to more clearly illustrate the embodiments of the present application or technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings can be obtained by those skilled in the art according to the drawings.

FIG. 1 is a schematic view of a connection structure between a backrest folding joint for a wheelchair and the wheelchair according to the present invention;

FIG. 2 is a schematic view of a connection structure between two backrest folding joints and a lifting rod according to the present invention;

FIG. 3 is an exploded view of a folding back joint provided by the present invention;

FIG. 4 is a schematic structural view of a fixing assembly provided in the present invention;

FIG. 5 is a schematic structural diagram of a regulating plate according to the present invention;

fig. 6 is a schematic structural diagram of a limiting plate provided by the utility model;

FIG. 7 is a schematic structural view of a clip according to the present invention;

FIG. 8 is a schematic structural view of a rotating assembly provided by the present invention;

FIG. 9 is an exploded view of the pivot assembly of the present invention with the spring, ball and snap-fit assembly;

FIG. 10 is a schematic structural view of the rotating assembly of the present invention after being connected to the spring, the ball and the engaging member;

FIG. 11 is a partially disassembled view of the folding joint of the backrest in the extended locked condition according to the present invention;

FIG. 12 is a first perspective view of the folding back joint of the present invention in an extended and locked position;

FIG. 13 is a second perspective view of the back folding joint in an extended locked position in accordance with the present invention;

FIG. 14 is a schematic structural view of a third perspective of the folding back joint in the extended locked position according to the present invention;

fig. 15 is a schematic structural view of a folding joint of a backrest in a folding and locking state provided by the utility model.

Description of reference numerals:

1. a backrest frame; 2. a seat frame; 3. a back-fold joint; 30. a fixing assembly; 3001. avoiding holes; 3002. a first screw hole; 3003. a sixth positioning hole; 3004. a second screw hole; 3005. a jack; 31. an adjusting plate; 3101. a first positioning hole; 3102. a first fixing hole; 32. a limiting plate; 3201. a second positioning hole; 3202. a second fixing hole; 3203. a limiting groove; 33. a clamping piece; 3301. a clamping groove; 3302. connecting holes; 3303. a fifth positioning hole; 3304. a third shaft pin; 34. a rotating assembly; 3401. a lower connecting plate; 34011. a fourth positioning hole; 34012. a third positioning hole; 3402. an upper connecting column; 34021. mounting holes; 35. a spring; 36. a ball bearing; 37. a first shaft pin; 38. a second shaft pin; 39. a fixing sheet; 40. a fourth shaft pin; 41. a first screw; 42. a second screw; 4. a transmission rod; 5. and lifting the pull rod.

Detailed Description

In order to make the technical solutions of the present invention better understood, those skilled in the art will now describe the present invention in further detail with reference to the accompanying drawings.

As shown in fig. 1 to 15, a backrest folding joint for a wheelchair according to an embodiment of the present invention includes a rotating component 34 connected to a backrest frame 1 of the wheelchair and a fixing component 30 connected to a seat frame 2 of the wheelchair, the rotating component 34 is rotatably connected to the fixing component 30 by a first shaft pin 37, a clamping member 33 is elastically and rotatably disposed on the rotating component 34, a clamping groove 3301 is disposed at a bottom of the clamping member 33, a second shaft pin 38 clamped and matched with the clamping groove 3301 is fixedly disposed on the fixing component 30, a third shaft pin 3304 is fixedly disposed on the clamping member 33, a limiting plate 32 is fixedly disposed on the fixing component 30, the limiting plate 32 is disposed between the fixing component 30 and the rotating component 34, a limiting groove 3203 clamped and matched with the third shaft pin 3304 is disposed on the limiting plate 32, and when the backrest folding joint is in an extended state, the second shaft pin 38 is clamped with the clamping groove 3301, and when the folding state is achieved, the third shaft pin 3304 is clamped with the limiting groove 3203.

The backrest folding joint for the wheelchair provided by the embodiment is arranged on the wheelchair, and realizes folding and extension of the wheelchair. Specifically, back frame 1 of wheelchair is used for installing the back, seat frame 2 of wheelchair is used for installing the seat, be provided with two vertical poles on the back frame 1, be provided with the horizontal pole with two vertical pole one-to-ones on the seat frame 2, back folding joint 3 is located between vertical pole and the horizontal pole, the quantity of back folding joint 3 is two, two back folding joints 3 are connected two sets of one-to-one vertical poles and horizontal pole respectively, utilize the folding of back folding joint 3 and extend the folding and extension that realize back frame 1 and seat frame 2, realize the folding and the extension of wheelchair promptly. Rotating assembly 34 is connected with the vertical pole on the back frame 1, and fixed subassembly 30 is connected with the transverse bar on the seat frame 2, and the pivot pin 37 rotates with rotating assembly 34 to be connected, sets up with fixed subassembly 30 relatively fixed, and the last elasticity of rotating assembly 34 rotates joint piece 33 that sets up and is used for fixing subassembly 30 and rotating assembly 34 locking, makes rotating assembly 34 unable rotation, and specific joint mode is: the bottom of the clamping piece 33 is provided with a clamping groove 3301, a second shaft pin 38 clamped and matched with the clamping groove 3301 is fixedly arranged on the fixed component 30, and when the clamping groove 3301 is clamped and connected with the second shaft pin 38, the fixed component 30 and the rotating component 34 can be locked in an extending state; meanwhile, the clamping piece 33 is fixedly provided with a third shaft pin 3304, the fixed assembly 30 is fixedly provided with a limiting plate 32, the limiting plate 32 is provided with a limiting groove 3203 matched with the third shaft pin 3304 in a clamping manner, and when the third shaft pin 3304 is clamped with the limiting groove 3203, the fixed assembly 30 and the rotating assembly 34 can be locked in a folding state. Because the clamping member 33 is elastically rotated and arranged on the rotating component 34, the clamping member 33 has acting force rotating downwards by utilizing the elastic rotation, under the action of pulling the clamping member 33 without external force, the acting force enables the clamping groove 3301 to be firmly clamped with the second shaft pin 38, and enables the third shaft pin 3304 to be firmly clamped with the limiting groove 3203, and only when the external force acts on the clamping member 33, the clamping member 33 rotates upwards, and the unlocking of the fixed component 30 and the rotating component 34 can be realized.

In this embodiment, by providing the second shaft pin 38 and the clamping groove 3301 in clamping fit, and the third shaft pin 3304 and the limiting groove 3203 in clamping fit, when the wheelchair is in an extended state, the second shaft pin 38 is clamped with the clamping groove 3301, and the third shaft pin 3304 is separated from the limiting groove 3203, so that the back frame 1 and the seat frame 2 of the wheelchair are separated at a certain angle; so that when the wheelchair is folded, the third shaft pin 3304 is engaged with the stopper groove 3203 and the second shaft pin 38 is separated from the engaging groove 3301, thereby allowing the back frame 1 and the seat frame 2 of the wheelchair to be stably folded. Compared with the prior art, the backrest folding joint for the wheelchair can lock the wheelchair in a folded state, so that the backrest frame 1 and the seat frame 2 cannot rotate relatively, the condition of extending the wheelchair cannot occur when the folded wheelchair is carried, the moving and carrying work of the wheelchair cannot be influenced, and the defects in the prior art can be effectively overcome.

In this embodiment, when the two sets of fixing components 30 and rotating components 34 need to be unlocked to enable the fixing components 30 and the rotating components 34 to rotate relatively, only the clamping member 33 needs to be rotated upwards. In a folded and locked state, when the two clamping members 33 are rotated upwards, the two corresponding sets of third shaft pins 3304 can be separated from the limiting grooves 3203, so that unlocking is realized; in the extended and locked state, when the two engaging members 33 are rotated upward, the two corresponding sets of second shaft pins 38 can be separated from the engaging grooves 3301, thereby unlocking.

In order to facilitate the simultaneous upward rotation of the two clamping pieces 33, a connecting hole 3302 is formed in one end of each clamping piece 33, which is far away from the third shaft pin 3304, a transmission rod 4 is rotatably connected to the connecting hole 3302, a lifting rod 5 is connected between the transmission rods 4 on the two clamping pieces 33, and the two clamping pieces 33 can be simultaneously rotated upward by lifting the lifting rod 5 with one hand.

In this embodiment, rotating assembly 34 includes upper connecting column 3402 and two lower connecting plates 3401 that set up relatively, and upper connecting column 3402 and two lower connecting plates 3401 fixed connection are provided with the space between two lower connecting plates 3401, and the setting of joint spare 33 elasticity rotation is in the space. The joint piece 33 becomes crooked slice, and two lower connecting plates 3401 are located the both sides of joint piece 33 respectively, can carry out the spacing of both sides to pivoted joint piece 33, make joint piece 33 rotate more steadily, make joint piece 33 have rotatable space through the setting in space.

In this embodiment, the clamping member 33 is rotationally connected with the two lower connecting plates 3401 through the fourth shaft pin 40, the placing grooves 34013 have been seted up to the bottom symmetry of the two lower connecting plates 3401, the spring 35 has been placed in two placing grooves 34013, the ball 36 has been placed to the tip of spring 35, the diameter of ball 36 is greater than the diameter of spring 35, the side of the clamping member 33 is extruded in the bottom slip of ball 36. Realized joint spare 33 and the rotation between the rotation piece 34 under the effect of fourth pivot axle 40, realized the elasticity rotation of joint spare 33 under the effect of spring 35, the one end of spring 35 and the bottom surface butt of standing groove 34013, the other end and ball 36 butt, the diameter of ball 36 is greater than the diameter of spring 35 and makes the tip that is located spring 35 that ball 36 can be stable, ball 36 slides the extrusion with the narrow side of joint spare 33, when joint spare 34 rotates around fourth pivot axle 40, ball 36 takes place relative displacement with joint spare 34, utilize the spherical design of ball 36, make the frictional force that joint spare 34 received less, and difficult messenger's spring 35 produces great deformation, make spring 35 produce good effort to joint spare 34 all the time, so that joint spare 34 has stable locking function.

In this embodiment, the two lower connecting plates 3401 are provided with a fourth positioning hole 34011, the clamping member 33 is provided with a fifth positioning hole 3303 corresponding to the fourth positioning hole 34011, and the fourth shaft pin 40 is inserted into the fourth positioning hole 34011 and the fifth positioning hole 3303. The fourth shaft pin 40 is rotatably connected with the fifth positioning hole 3303, and two ends of the fourth shaft pin 40 are respectively inserted into the fourth positioning holes 34011 of the two lower connecting plates 3401, so that the rotatable connection between the clamping member 33 and the two lower connecting plates 3401 is realized.

In this embodiment, the adjusting plate 31 is detachably installed on the fixing component 30, the adjusting plate 31 is used for fixing the outer side of the component 30, the joint member 34 and the limiting plate 32 are located on the inner side of the fixing component 30, the adjusting plate 31 is provided with a first positioning hole 3101 for the second shaft pin 38 to pass through and a plurality of fixing holes 3102, the distances between the fixing holes 3102 and the first positioning hole 3101 are different, the fixing component 30 is provided with a hole 3001 for the second shaft pin 38 to pass through, and the hole 3001 is in a long arc shape. The fixing component 30 is provided with a first screw hole 3002 corresponding to the first fixing hole 3102, and the first screw hole 3002 is screwed with a first screw 41 penetrating through the first fixing hole 3102. The first screw 41 is used for realizing the fixed connection between the adjusting plate 31 and the fixing component 30, and the second axis pin 38 penetrates through the first positioning hole 3101, so that the firmness of the connection between the adjusting plate 31 and the fixing component 30 can be improved, and the stress of the first screw 41 can be reduced.

By providing a plurality of fixing holes 3102 and by providing a plurality of fixing holes 3102 at different distances from the first positioning holes 3101, the design herein has the following effects: the position between the second shaft pin 38 and the fixed component 30 can be changed by fixedly connecting the adjusting plate 31 and the fixed component 30 through different first fixing holes 3102, the avoiding hole 3001 is used for enabling the second shaft pin 38 to have a space with a changeable position, and because the rotation center of the clamping piece 33 is unchanged relative to the fixed component 30, the change of the position of the second shaft pin 38 can enable the inclination angle between the rotating component 34 and the fixed component 30 to be different when the second shaft pin 38 is clamped and locked with the clamping groove 3301 on the clamping piece 33, so that the inclination of the backrest frame 1 can be changed, and the wheelchair backrest can meet different requirements of a human body.

In this embodiment, the limiting plate 32 is provided with a second fixing hole 3202, the fixing assembly 30 is provided with a second screw hole 3004 corresponding to the second fixing hole 3202, the second screw hole 3004 is screwed with a second screw 42 penetrating through the second fixing hole 3202, and the limiting plate 32 is fixedly connected to the fixing assembly 30 by the second screw 42.

In this embodiment, the fixing assembly 30 is provided with a sixth positioning hole 3003, the limiting plate 32 is provided with a second positioning hole 3201 corresponding to the sixth positioning hole 3003, the two lower connecting plates 3401 are provided with third positioning holes 34012 corresponding to the second positioning holes 3201, and the first shaft pin 37 passes through the third positioning hole 34012, the second positioning hole 3201 and the sixth positioning hole 3003. The first shaft pin 37 penetrates through the second positioning hole 3201, so that the connection firmness of the limiting plate 32 and the fixing assembly 30 can be improved, and the stress of the second screw 42 can be reduced.

In the present embodiment, a fixing piece 39 for fixing the first shaft pin 37 and the second shaft pin 38 is connected between the end of the first shaft pin 37 and the end of the second shaft pin 38. The fixing piece 39 is fixedly connected to the end of the first shaft pin 37 and the end of the second shaft pin 38, and a nut is screwed to the end of the first shaft pin 37 and the end of the second shaft pin 38. The fixing piece 39 fixes the first shaft pin 37 and the second shaft pin 38 is specifically explained in that a side surface of the fixing piece 39 is in sliding abutment with a side surface of the lower connecting plate 3401 so that one end portion of the first shaft pin 37 and one end portion of the second shaft pin 38 are restrained, while the other end portion of the first shaft pin 37 and the other end portion of the second shaft pin 38 pass through the fixing assembly 30 through the sixth positioning hole 3003 and the escape hole 3001, respectively, and both the other end portion of the first shaft pin 37 and the other end portion of the second shaft pin 38 are provided with a restraining cap so that both the other end portion of the first shaft pin 37 and the other end portion of the second shaft pin 38 are restrained by the fixing assembly 30. It can be seen that both ends of the first shaft pin 37 and both ends of the second shaft pin 38 are limited, thereby achieving the fixation of the first shaft pin 37 and the second shaft pin 38.

In this embodiment, the fixing member 30 is provided with an insertion hole 3005 into which the transverse bar of the seat frame 2 is inserted, and then the fixing member 30 can be fixedly connected to the transverse bar by using a bolt; the upper connecting column 3402 is inserted into the vertical rod on the backrest frame 1, corresponding mounting holes 34021 are formed in the upper connecting column 3402 and the vertical rod, and the rotating assembly 34 can be fixedly connected with the vertical rod by inserting bolts into the mounting holes 34021.

The working principle of the backrest folding joint for the wheelchair provided by the embodiment is as follows: when the fixed member 30 and the rotating member 34 are in the unlocked state, the second shaft pin 38 is separated from the catching groove 3301, meanwhile, the third shaft pin 3304 and the limiting groove 3203, by rotating the backrest frame 1 in a direction away from the seat frame 2, the backrest frame 1 drives the rotating assembly 34 to rotate synchronously, and during the rotation of the rotating assembly 34, the clamping member 30 is continuously close to the second shaft pin 38 until the clamping member 30 contacts with the second shaft pin 38, the second shaft pin 38 is staggered with the clamping groove 3301 at the moment of contact, the rotating assembly 34 is continuously rotated to enable the clamping member 30 to reversely rotate under the extrusion action of the second shaft pin 38, so that the spring 35 is stressed and compressed, at the moment, the spring 35 generates elastic force, the rotating assembly 34 is continuously rotated to enable the second shaft pin 38 to be clamped with the clamping groove 3301, and then the external force is removed, the second shaft pin 38 is firmly clamped with the clamping groove 3301 under the action of the elastic force of the spring 35, so that the extension locking of the wheelchair is realized; then, the two clamping members 33 are rotated upwards by applying an upward force to the two clamping members 33, at this time, the second shaft pin 38 is separated from the clamping groove 3301, the fixed component 30 and the rotating component 34 are in an unlocked state, then the backrest frame 1 is rotated towards the direction close to the seat frame 2, at this time, the backrest frame 1 drives the rotating component 34 to rotate synchronously, the third shaft pin 3304 on the clamping member 33 continuously approaches towards the direction of the limit plate 32 in the rotating process of the rotating component 34 until the third shaft pin 3304 abuts against the limit plate 32, at this time, the third shaft pin 3304 is staggered with the limit groove 3203, the side surface of the limit plate 32 abutting against the third shaft pin 3304 is an arc surface, after the rotating component 34 continues to rotate, the third shaft pin 3304 slides and presses against the side surface of the limit plate 32, so that the limit plate 32 presses the clamping members 33 to rotate to make the spring 35 deform to generate an elastic force, the rotating component 34 continues to make the third shaft pin 3304 clamp with the limit groove 3203, then remove external force, make third axle pin 3304 and spacing groove 3203 firmly joint under the effect of spring 35 to realize the folding locking of wheelchair, the principle is the same when stretching again, does not describe in detail.

While certain exemplary embodiments of the present invention have been described above by way of illustration only, it will be apparent to those of ordinary skill in the art that the described embodiments may be modified in various different ways without departing from the spirit and scope of the utility model. Accordingly, the drawings and description are illustrative in nature and should not be construed as limiting the scope of the utility model.

Claims (9)

1. The utility model provides a back folding joint for wheelchair, includes rotating assembly (34) that are connected with back frame (1) of wheelchair and fixed subassembly (30) that are connected with seat frame (2) of wheelchair, rotating assembly (34) and fixed subassembly (30) are connected through first pivot (37) rotation, its characterized in that: rotation subassembly (34) are gone up the elasticity and are rotated and be provided with joint spare (33), the bottom of joint spare (33) is equipped with joint groove (3301), fixed mounting is gone up in fixed subassembly (30) and is had second axle pin (38) with joint groove (3301) joint complex, fixed mounting has third axle pin (3304) on joint spare (33), fixed mounting has limiting plate (32) on fixed subassembly (30), limiting plate (32) are located between fixed subassembly (30) and rotation subassembly (34), set up on limiting plate (32) with third axle pin (3304) joint complex spacing groove (3203), during the state of extension, second axle pin (38) and joint groove (3301) joint, during folded condition, third axle pin (3304) and spacing groove (3203) joint.

2. The backrest-folding joint for a wheelchair according to claim 1, characterized in that: rotating assembly (34) are including last spliced pole (3402) and two lower connecting plate (3401) of relative setting, go up spliced pole (3402) and two lower connecting plate (3401) fixed connection, two be provided with the space down between connecting plate (3401), joint spare (33) elasticity rotates and sets up in the space.

3. The backrest folding joint for a wheelchair according to claim 2, characterized in that: joint spare (33) are connected through fourth pivot (40) and two lower connecting plate (3401) rotations, two standing groove (34013) have been seted up to lower connecting plate (3401) bottom symmetry, two place spring (35) have been placed in standing groove (34013), ball (36) have been placed to the tip of spring (35), the diameter of ball (36) is greater than the diameter of spring (35), the side of the bottom slip extrusion joint spare (33) of ball (36).

4. The backrest-folding joint for a wheelchair according to claim 3, characterized in that: and fourth positioning holes (34011) are formed in the two lower connecting plates (3401), fifth positioning holes (3303) corresponding to the fourth positioning holes (34011) are formed in the clamping piece (33), and the fourth shaft pin (40) is inserted into the fourth positioning holes (34011) and the fifth positioning holes (3303).

5. The backrest folding joint for a wheelchair according to claim 2, characterized in that: fixed subassembly (30) are gone up detachably and are installed regulating plate (31), set up first locating hole (3101) and a plurality of fixed orifices (3102) that supply second axis pin (38) to pass on regulating plate (31), it is a plurality of the distance between fixed orifices (3102) and first locating hole (3101) is different, set up on fixed subassembly (30) and supply second axis pin (38) to pass and dodge hole (3001), it is long arc to dodge hole (3001).

6. The backrest folding joint for a wheelchair according to claim 5, characterized in that: the fixing component (30) is provided with a first screw hole (3002) corresponding to the first fixing hole (3102), and the first screw hole (3002) is screwed with a first screw (41) penetrating through the first fixing hole (3102).

7. The backrest-folding joint for a wheelchair according to claim 1, characterized in that: the limiting plate (32) is provided with a second fixing hole (3202), the fixing component (30) is provided with a second screw hole (3004) corresponding to the second fixing hole (3202), and the second screw hole (3004) is screwed with a second screw (42) penetrating through the second fixing hole (3202).

8. The backrest folding joint for a wheelchair according to claim 5, characterized in that: the fixed component (30) is provided with a sixth positioning hole (3003), the limiting plate (32) is provided with a second positioning hole (3201) corresponding to the sixth positioning hole (3003), two the lower connecting plate (3401) is provided with a third positioning hole (34012) corresponding to the second positioning hole (3201), and the first shaft pin (37) penetrates through the third positioning hole (34012), the second positioning hole (3201) and the sixth positioning hole (3003).

9. The backrest-folding joint for a wheelchair according to claim 8, characterized in that: a fixing piece (39) used for fixing the first shaft pin (37) and the second shaft pin (38) is connected between the end part of the first shaft pin (37) and the end part of the second shaft pin (38).

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