CN216933787U - Universal wheel arm for wheelchair - Google Patents

Abstract

The utility model relates to the technical field of wheelchairs and discloses a universal wheel arm for a wheelchair, which comprises a holding piece fixedly connected with a front support arm of the wheelchair and a vertical rod connected with a universal wheel, wherein the holding piece is fixedly connected with a hollow tube through a support rod, one end of the hollow tube is rotatably inserted with a rotary column, the other end of the hollow tube is detachably provided with a locking cover, the locking cover is simultaneously clamped with the rotary column and the hollow tube, the hollow tube is provided with a movable hole for the vertical rod to pass through, the length of the movable hole is greater than the diameter of the vertical rod, and the vertical rod is detachably connected with the rotary column through the movable hole. The universal wheel arm for the wheelchair can realize the angle adjustment of the universal wheel in the vertical direction when the front support arm of the wheelchair is not completely vertical to the ground so as to ensure that the universal wheel is vertical to the ground again, thereby preventing the stress point of the universal wheel and the rotating axis of the universal wheel from deviating, keeping the rotating flexibility of the universal wheel and avoiding the damage of the universal wheel.

Description

Universal wheel arm for wheelchair

Technical Field

The utility model relates to the technical field of wheelchairs, in particular to a universal wheel arm for a wheelchair.

Background

The wheelchair is an important mobile tool for home rehabilitation, turnover transportation, treatment and outing activities of wounded persons, patients and disabled persons, and is divided into an electric folding wheelchair and a manual folding wheelchair. Both electric wheelchairs and manually foldable wheelchairs comprise front and rear wheels, wherein the front wheels are generally universal wheels with smaller diameters, and the rear wheels are oriented wheels with larger diameters.

The height of the rear wheels can be adjusted generally in order to meet the requirements of different postures of a human body, so that the height between the front wheels and the rear wheels can be adjusted, and the human body can use the wheelchair more comfortably and safely in different postures.

The universal wheel of wheelchair is installed on the preceding support arm of wheelchair through the universal wheel arm, among the prior art, because the relative position of universal wheel and universal wheel arm on the vertical direction is unadjustable, after the high emergence of rear wheel changed, can make originally and take place the tilt around with perpendicular to the ground's universal wheel takes place, lead to the atress point of universal wheel and the rotation axle center of universal wheel to take place the skew, use under this condition for a long time and can seriously influence universal wheel pivoted flexibility, and increase wearing and tearing, cause the damage of universal wheel even.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a universal wheel arm for a wheelchair, which has the advantages of adjusting the relative position of the universal wheel arm and a universal wheel in the vertical direction and ensuring that the universal wheel is always in a vertical state so as to solve the defects in the prior art.

In order to achieve the above purpose, the utility model provides the following technical scheme: the utility model provides a universal wheel arm for wheelchair, includes the pole that hangs down that is connected with the bracing piece of embracing of the preceding bracing piece fixed connection of wheelchair and with the universal wheel, embrace the piece and pass through bracing piece fixedly connected with hollow tube, the one end of hollow tube is rotated and is pegged graft and has been had the column spinner, and other end detachably installs the locking lid, the locking lid simultaneously with column spinner and hollow tube joint, set up the movable hole that supplies the pole of hanging down to pass on the hollow tube, the length in movable hole is greater than the diameter of pole that hangs down, the pole that hangs down can be dismantled through movable hole and column spinner and be connected.

The universal wheel arm for the wheelchair is characterized in that the end face of the hollow tube is provided with a plurality of circumferentially-arranged outer locking holes, the end face of the rotary column is provided with a plurality of circumferentially-arranged inner locking holes, the locking cover is provided with a plurality of circumferentially-arranged outer locking teeth and a plurality of circumferentially-arranged inner locking teeth, the outer locking teeth are in one-to-one clamping connection with the outer locking holes, and the inner locking teeth are in one-to-one clamping connection with the inner locking holes.

The locking cover comprises an outer limiting cover and an inner inserting connecting column which are fixedly connected, the inner inserting connecting column protrudes out of the outer limiting cover, the inner inserting connecting column is rotatably inserted into an inner cavity of the hollow tube, the outer locking teeth are fixedly arranged on the side face of the outer limiting cover, and the inner locking teeth are fixedly arranged on the side face of the inner inserting connecting column.

The universal wheel arm for the wheelchair comprises a body and a cover body fixedly connected with the side face of the body, wherein the diameter of the cover body and the diameter of the outer limiting cover are both larger than the diameter of the inner cavity of the hollow tube, and the cover body and the outer limiting cover are respectively positioned on the left side and the right side of the hollow tube.

Foretell universal wheel arm for wheelchair, set up the jack that supplies the pole of hanging down to pass on the body, first mounting hole has been seted up at the center of locking lid, second mounting hole and the screw hole that is linked together with the jack are seted up at the center of body, the second mounting hole is located the one side that is close to interior locking hole, set up on the pole of hanging down to the perforation, first mounting hole, second mounting hole, to the coincidence of the central axis of perforation and screw hole, the screw with the screw hole spiro union has been pegged graft in first mounting hole, second mounting hole, to perforation and the screw hole, the diameter of the nut of screw is greater than the diameter of first mounting hole.

According to the universal wheel arm for the wheelchair, the inner wall of the insertion hole is in sliding fit with the outer wall of the vertical rod.

Foretell universal wheel arm for wheelchair, embrace the piece and establish the ring body of opening on the preceding support arm of wheelchair including the cover, the both ends of opening the ring body are provided with connecting portion, two relatively the connecting hole has been seted up to the symmetry on the connecting portion, two the bolt has been pegged graft in the connecting hole on the connecting portion.

The universal wheel arm for the wheelchair is characterized in that the supporting rod is an arc-shaped rod which inclines downwards.

In the technical scheme, the universal wheel arm for the wheelchair, provided by the utility model, is characterized in that the hollow tube fixedly connected with the support rod is arranged, the rotary column is arranged in the hollow tube in a rotating manner, the rotary column is connected with the vertical rod, and the vertical rod is connected with the universal wheel, so that the rotary column, the vertical rod and the universal wheel can synchronously rotate in the vertical direction, when the rotary column is locked by the locking cover, the vertical rod and the universal wheel can be locked in the vertical direction, when the support arm at the front of the wheelchair is not completely vertical to the ground, the locking cover can be separated from the hollow tube, the rotary column can be unlocked and rotated, the vertical rod and the universal wheel can rotate in the vertical direction by utilizing the rotation of the rotary column, the vertical rod and the universal wheel can be maintained vertical to the ground again in the rotating process, then the locking cover is remounted on the hollow tube to lock the rotary column, and the verticality of the universal wheel can be effectively ensured on the basis, compared with the prior art, the universal wheel arm for the wheelchair can realize the angle adjustment of the universal wheel in the vertical direction when the front support arm of the wheelchair is not completely vertical to the ground, so that the universal wheel is vertical to the ground again, the stress point of the universal wheel can be prevented from deviating from the rotating axis of the universal wheel, the rotating flexibility of the universal wheel is kept, the abrasion is reduced, the damage of the universal wheel is avoided, 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 front view of a universal wheel arm for a wheelchair according to an embodiment of the present invention in connection with the wheelchair;

FIG. 2 is a schematic structural view of a first perspective of a universal wheel arm and a universal wheel for a wheelchair according to an embodiment of the present invention;

FIG. 3 is a schematic structural view of a second perspective of a universal wheel arm for a wheelchair according to an embodiment of the present invention;

fig. 4 is a schematic diagram of a disassembled structure of a universal wheel arm according to an embodiment of the present invention;

FIG. 5 is a schematic structural view of a hollow tube according to an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a spin column according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of a locking cover according to an embodiment of the present invention.

Description of reference numerals:

1. a wheelchair front support arm; 2. a universal wheel; 3. a universal wheel arm; 31. a holding piece; 3101. an open ring body; 3102. a connecting portion; 31021. connecting holes; 32. a support bar; 33. a hollow tube; 3301. an outer locking hole; 3302. a movable hole; 34. a spin column; 3401. a body; 3402. a cover body; 3403. a second mounting hole; 3404. a threaded hole; 3405. an inner locking hole; 3406. a jack; 35. a locking cover; 3501. an outer limit cover; 3502. an outer locking tooth; 3503. inserting a connecting post inside; 3504. an inner locking tooth; 3505. a first mounting hole; 36. a drop bar; 3601. perforating; 37. and (4) screws.

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 7, a universal wheel arm for a wheelchair according to an embodiment of the present invention includes a clasping member 31 fixedly connected to a front support arm 1 of the wheelchair and a hanging rod 36 connected to a universal wheel 2, the clasping member 31 is fixedly connected to a hollow tube 33 through a support rod 32, one end of the hollow tube 33 is rotatably inserted into a rotating column 34, the other end of the hollow tube 33 is detachably mounted with a locking cover 35, the locking cover 35 is simultaneously clamped with the rotating column 34 and the hollow tube 33, the hollow tube 33 is provided with a movable hole 3302 for the hanging rod 36 to pass through, the length of the movable hole 3302 is greater than the diameter of the hanging rod 36, and the hanging rod 36 is detachably connected to the rotating column 34 through the movable hole 3302.

The universal wheel arm for the wheelchair provided by the embodiment is used for connecting the universal wheel 2 with the front support arm 1 of the wheelchair, and can realize the angle adjustment of the universal wheel 2 in the vertical direction so as to keep the universal wheel 2 vertical. Specifically, the wheelchair front support arm 1 has two, and each universal wheel arm 3 is respectively installed on each front support arm 1, is connected with a universal wheel 2 on each universal wheel arm 3. The universal wheel arm 3 comprises a holding piece 31 fixedly connected with the wheelchair front support arm 1, the holding piece 31 is fixedly connected with the wheelchair front support arm 1 through bolts, the holding piece 31 comprises an open ring body 3101 sleeved on the wheelchair front support arm 1, two ends of the open ring body 3101 are oppositely provided with connecting parts 3102, connecting holes 31021 are symmetrically formed in the two connecting parts 3102, bolts are inserted into the connecting holes 31021 in the two connecting parts 3102, and the universal wheel arm 3 can be fixedly connected with the wheelchair front support arm 1 by inserting the bolts into the connecting holes 31021 in the two connecting parts 3102 and screwing the bolts. One end of the support rod 32 is welded to the outer surface of the holding member 31, and the other end is welded to the outer surface of the hollow tube 33, so that the holding member 31 is fixedly connected with the hollow tube 33. The inner cavity of the hollow tube 33 is a cylinder, the rotary column 34 is inserted into the inner cavity of the hollow tube 33 from one end of the hollow tube 33, the outer diameter of the rotary column 34 is the same as the inner diameter of the hollow tube 33, so that the outer surface of the rotary column 34 is attached to the inner wall of the hollow tube 33, and the rotary column 34 can smoothly rotate in the inner cavity of the hollow tube 33 without locking the rotary column 34. Locking lid 35 inserts from the other end of hollow tube 33, inserts back locking lid 35 simultaneously with hollow tube 33 and column spinner 34 joint, because hollow tube 33 is fixed state, so utilize locking lid 35 and hollow tube 33's joint for locking lid 35 locking, and locking lid 35 again with column spinner 34 joint, thereby realize column spinner 34's locking. The vertical rod 36 is fixedly connected with the universal wheel 2, the universal wheel 2 can rotate horizontally by 360 degrees (the structure of the universal wheel is the prior art, and is not described in detail), the axial lead of the vertical rod 36 coincides with the rotational axial lead of the universal wheel 2, and when the vertical rod 36 is perpendicular to the ground, the universal wheel 2 will also be perpendicular to the ground. The movable hole 3302 is used for passing the vertical rod 36, the movable hole 3302 faces the ground, and the length of the movable hole 3302 is greater than the diameter of the vertical rod 36, so that the vertical rod 36 has a space for rotating in the vertical direction, that is, when the universal wheel 2 is not perpendicular to the ground, the universal wheel 2 can be kept perpendicular to the ground again by adjusting the angle of the vertical rod 36 in the vertical direction, the vertical rod 36 passes through the movable hole 3302 and is detachably connected with the rotary column 34, when the connection position of the rotary column 34 and the vertical rod 36 is fixed, the vertical rod 36 rotates in the hollow tube 33, and when the locking cover 35 locks the rotary column 34, that is, the vertical rod 36 and the universal wheel 2 are locked, so that the universal wheel 2 cannot rotate in the vertical direction any more.

In this embodiment, by providing the hollow tube 33 fixedly connected to the support bar 32, and providing the rotating column 34 in the hollow tube 33 by rotation, because the rotating column 34 is connected to the hanging bar 36, and the hanging bar 36 is connected to the universal wheel 2, the rotating column 34, the hanging bar 36 and the universal wheel 2 can rotate synchronously in the vertical direction, and when the locking cover 35 locks the rotating column 34, the hanging bar 36 and the universal wheel 2 can be locked in the vertical direction, when the front support arm 1 of the wheelchair is not completely perpendicular to the ground, the locking cover 35 can be separated from the hollow tube 33, so that the rotating column 34 can be unlocked and rotated, by the rotation of the rotating column 34, the hanging bar 36 and the universal wheel 2 can be rotated in the vertical direction, and the hanging bar 36 and the universal wheel 2 can be maintained perpendicular to the ground again during rotation, and then the locking cover 35 can be remounted on the hollow tube 33 to lock the rotating column 34, based on the situation, the verticality of the universal wheel 2 can be effectively ensured, compared with the prior art, the universal wheel arm for the wheelchair can realize the angle adjustment of the universal wheel 2 in the vertical direction when the front support arm 1 of the wheelchair is not completely vertical to the ground, so that the universal wheel 2 is vertical to the ground again, the deviation of the stress point of the universal wheel 2 and the rotation axis of the universal wheel 2 can be prevented, the rotation flexibility of the universal wheel 2 is kept, the abrasion is reduced, the damage to the universal wheel 2 is avoided, and the defects in the prior art can be effectively overcome.

In this embodiment, the locking cover 35 specifically locks the rotary column 34 in such a manner that the end face of the hollow tube 33 is provided with a plurality of circumferentially arranged outer locking holes 3301, the end face of the rotary column 34 is provided with a plurality of circumferentially arranged inner locking holes 3405, the outer locking holes 3301 and the inner locking holes 3405 are located on the same side, the locking cover 35 is provided with a plurality of circumferentially arranged outer locking teeth 3502 and a plurality of circumferentially arranged inner locking teeth 3504, each outer locking tooth 3502 is in one-to-one engagement with each outer locking hole 3301, and each inner locking tooth 3504 is in one-to-one engagement with each inner locking hole 3405. Locking of locking cover 35 on hollow tube 33 has been realized through the joint with outer locking tooth 3502 and outer locking hole 3301, the locking of column spinner 34 on hollow tube 33 has been realized through the joint of interior locking tooth 3504 with interior locking hole 3405, and because interior locking tooth 3504, interior locking hole 3405, outer locking tooth 3502, the quantity of outer locking hole 3301 is a plurality of and circumference range (preferably circumference equidistance range), so when column spinner 34 rotates in the inner chamber of hollow tube 33 back, still can realize outer locking tooth 3502 and outer locking hole 3301 joint and the joint of interior locking tooth 3504 and interior locking hole 3405 simultaneously, through the mode of this joint, realized locking cover 35 to the locking of column spinner 34.

Further, the locking cover 35 includes an outer limiting cover 3501 and an inner inserting column 3503 which are fixedly connected, the inner inserting column 3503 protrudes out of the outer limiting cover 3501, the inner inserting column 3503 is rotatably inserted into the inner cavity of the hollow tube 33, the diameter of the inner inserting column 3503 is the same as that of the inner cavity of the hollow tube 33, so that the connection stability of the locking cover 35 and the hollow tube 33 is improved, the outer locking teeth 3502 are fixedly arranged on the side surface of the outer limiting cover 3501, and the inner locking teeth 3504 are fixedly arranged on the side surface of the inner inserting column 3503.

Still further, the rotating column 34 includes a body 3401 and a cover 3402 fixedly connected to a side of the body 3401, a diameter of the cover 3402 and a diameter of the outer limiting cover 3501 are both greater than a diameter of an inner cavity of the hollow tube 33, and the cover 3402 and the outer limiting cover 3501 are respectively located at left and right sides of the hollow tube 33. The cover 3402 plays a role in limiting the rotating column 34, the outer limiting cover 3501 plays a role in limiting the locking cover 35, and when the locking cover 35 is installed, the side surface of the cover 3402 and the side surface of the outer limiting cover 3501 are respectively pressed and attached to the left side surface and the right side surface of the hollow pipe 33. The length of body 3401 is less than the length of hollow tube 33, and is used for fitting inner insert post 3503 protruding from outer limit cover 3501, so that inner insert post 3503 can be inserted into the inner cavity of hollow tube 33.

In this embodiment, the locking cover 35 is detachably connected to the hollow tube 33, and the hanging bar 36 is detachably connected to the rotary column 34, the body 3401 is provided with an insertion hole 3406 through which the hanging bar 36 passes, the locking cover 35 is provided with a first mounting hole 3505 at the center, the body 3401 is provided with a second mounting hole 3403 and a threaded hole 3404 which are communicated with the insertion hole 3406 at the center, the second mounting hole 3403 is located at one side close to the inner locking hole 3405, the hanging bar 36 is provided with a through hole 3601, the first mounting hole 3505, the second mounting hole 3403 and the central axes of the through hole 3601 and the threaded hole 3404 coincide, the first mounting hole 3505, the second mounting hole 3403, the through hole 3601 and the threaded hole 3404 are inserted with a screw 37 screwed with the threaded hole 3404, and the diameter of a nut of the screw 37 is larger than that of the first mounting hole 3505. By inserting the screw 37 into the first mounting hole 3505, the second mounting hole 3403, the counter-penetrating hole 3601 and the threaded hole 3404 in this order, first, the connection between the hanging bar 36 and the rotary column 34 can be realized, so that the hanging bar 36 and the rotary column 34 are not separated; furthermore, after the tip of screw 37 got into screw hole 3404, through rotatory screw 37 with screw 37 spiro union get into screw hole 3404, utilize threaded connection, can make the side of lid 3402 and the side of outer spacing lid 3501 compress tightly the laminating with the left and right sides face of hollow tube 33 respectively, thereby realize the installation of locking lid 35, and utilize outer locking tooth 3502 and outer locking hole 3301 joint and interior locking tooth 3504 and the joint of interior locking hole 3405, finally realize locking lid 35, column 34, hang down pole 36 and hollow tube 33's fixed connection, thereby with universal wheel 2 locking. When the locking cover 35 needs to be separated from the hollow tube 33, the screw 37 only needs to be loosened by reversely rotating the screw 37, and when the rod 36 needs to be separated from the rotary column 34, the screw 37 only needs to be pulled out.

In this embodiment, the inner wall of the insertion hole 3406 is in sliding fit with the outer wall of the vertical rod 36, so that the timeliness of driving the rotating column 34 to rotate together when the vertical rod 36 rotates can be improved, the firmness of connection between the vertical rod 36 and the rotating column 34 is improved, and the vertical rod can not shake in the use process.

In this embodiment, the support bar 32 is an arc bar that is inclined downward.

The universal wheel arm for the wheelchair provided by the utility model has the working principle that: when the front support arm 1 of the wheelchair tilts forwards and backwards and is not completely perpendicular to the ground due to adjustment of the height of the rear wheel or other factors, the universal wheel 2 which is originally perpendicular to the ground will tilt (namely, the stress point between the universal wheel 2 and the ground deviates from the rotating axis of the universal wheel 2), for this purpose, the screw 37 can be screwed to separate the locking cover 35 from the hollow tube 33, so that the rotating column 34 can be unlocked and rotated, then the hanging rod 36 and the universal wheel 2 are rotated in the vertical direction, so that the universal wheel 2 is perpendicular to the ground again, and then the screw 37 is screwed again, so that the locking cover 35 is firmly installed on the hollow tube 33 again to lock the rotating column 34.

The "inclination" described in the present embodiment is an inclination in the front-rear direction with respect to the wheelchair.

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 (8)

1. The utility model provides a universal wheel arm for wheelchair, includes with wheelchair front strut (1) fixed connection embrace a (31) and hang down pole (36) that are connected with universal wheel (2), its characterized in that: embrace piece (31) through bracing piece (32) fixedly connected with hollow tube (33), the one end of hollow tube (33) is rotated and is pegged graft and have column spinner (34), and locking lid (35) are installed to other end detachably, locking lid (35) simultaneously with column spinner (34) and hollow tube (33) joint, set up movable hole (3302) that supply pole (36) of hanging down to pass on hollow tube (33), the length of movable hole (3302) is greater than the diameter of pole (36) of hanging down, pole (36) of hanging down can be dismantled with column spinner (34) through movable hole (3302) and be connected.

2. The universal wheel arm for a wheelchair according to claim 1, wherein: outer locking hole (3301) that a plurality of circumference were arranged are seted up to the terminal surface of hollow tube (33), a plurality of circumference inner locking hole (3405) of arranging are seted up to the terminal surface of column spinner (34), be provided with outer locking tooth (3502) that a plurality of circumference were arranged and inner locking tooth (3504) that a plurality of circumference were arranged on locking lid (35), each outer locking tooth (3502) and each outer locking hole (3301) one-to-one joint, each inner locking tooth (3504) and each inner locking hole (3405) one-to-one joint.

3. The universal wheel arm for a wheelchair according to claim 2, wherein: locking lid (35) are including outer spacing lid (3501) and the interior grafting post (3503) of fixed connection, interior grafting post (3503) protrusion is in outer spacing lid (3501), interior grafting post (3503) rotates with the inner chamber of hollow tube (33) and pegs graft, outer locking tooth (3502) are fixed to be set up on the side of outer spacing lid (3501), interior locking tooth (3504) are fixed to be set up on the side of interior grafting post (3503).

4. The universal wheel arm for a wheelchair according to claim 3, wherein: the spin column (34) includes body (3401) and with body (3401) side fixed connection's lid (3402), the diameter of lid (3402) and the diameter of outer spacing lid (3501) all are greater than the diameter of hollow tube (33) inner chamber, lid (3402) and outer spacing lid (3501) are located the left and right sides of hollow tube (33) respectively.

5. The universal wheel arm for a wheelchair according to claim 4, wherein: the locking cover is characterized in that an insertion hole (3406) for a hanging rod (36) to penetrate is formed in the body (3401), a first mounting hole (3505) is formed in the center of the locking cover (35), a second mounting hole (3403) and a threaded hole (3404) which are communicated with the insertion hole (3406) are formed in the center of the body (3401), the second mounting hole (3403) is located on one side close to the inner locking hole (3405), a pair of through holes (3601) are formed in the hanging rod (36), the central axes of the first mounting hole (3505), the second mounting hole (3403), the pair of through holes (3601) and the threaded hole (3404) are overlapped, a screw (37) which is in threaded connection with the threaded hole (3404) is inserted in the first mounting hole (3505), the second mounting hole (3403), the pair of through holes (3601) and the threaded hole (3404), and the diameter of a nut of the screw (37) is larger than that of the first mounting hole (3505).

6. The universal wheel arm for a wheelchair according to claim 5, wherein: the inner wall of the insertion hole (3406) is in sliding fit with the outer wall of the vertical rod (36).

7. The universal wheel arm for a wheelchair according to claim 1, wherein: the holding piece (31) comprises an open ring body (3101) sleeved on a front support arm (1) of the wheelchair, connecting parts (3102) are oppositely arranged at two ends of the open ring body (3101), connecting holes (31021) are symmetrically formed in the two connecting parts (3102), and bolts are inserted in the connecting holes (31021) in the two connecting parts (3102).

8. The universal wheel arm for a wheelchair of claim 1, wherein: the supporting rod (32) is an arc-shaped rod which inclines downwards.

Images