CN109419591B

CN109419591B - Wheel chair

Info

Publication number: CN109419591B
Application number: CN201710730245.3A
Authority: CN
Inventors: 林燕聪
Original assignee: Karma Medical Products Co Ltd
Current assignee: Karma Medical Products Co Ltd
Priority date: 2017-08-23
Filing date: 2017-08-23
Publication date: 2020-11-20
Anticipated expiration: 2037-08-23
Also published as: CN109419591A

Abstract

A wheelchair comprises a chair frame mechanism and two pedal mechanisms. The chair frame mechanism comprises a chair frame body and two leg rods. Each pedal mechanism comprises a pivot unit which is pivoted on the respective foot rod, a positioning unit which is arranged on the foot rod and a pedal unit which is arranged on the pivot unit, the pivot unit is provided with a moving groove which is used for the movement of the positioning unit and the embedding and limiting, and the moving groove is provided with a first groove section and a second groove section. When the positioning unit moves to the first groove section, the pedal unit is positioned at the front side of the chair frame body, and when the positioning unit moves to the second groove section, the pedal unit is positioned at the side of the chair frame body. Through the structural design of the positioning unit and the pivot unit, the pedal mechanism can swing relative to the foot rod, so that a user can more safely and conveniently leave the wheelchair.

Description

Wheel chair

Technical Field

The invention relates to a movable assistive device, in particular to a wheelchair.

Background

Referring to fig. 1, 2 and 3, a wheelchair 1 is known, which includes a frame 11 adapted to be seated on a user, a plurality of wheels 12 mounted on the frame 11, two leg bars 13 mounted on a front side of the frame 11, and two pedal units 14 respectively mounted on the leg bars 13 and adapted to be stepped on by the feet of the user.

Each leg 13 defines a plurality of positioning slots 131 spaced from each other, and each positioning slot 131 extends along the outer surface of the leg 13. Each pedal unit 14 includes a mounting rod 141 inserted into the respective foot rod 13, a latch 142 mounted on the mounting rod 141, and a pedal 143 mounted on the bottom end of the mounting rod 141. When the pedal unit 14 is installed in the foot rod 13, the elastic buckle 142 is embedded and limited in one of the positioning slots 131.

When the user wants to leave the wheelchair 1, the pedals 143 can be swung away from each other toward both sides of the frame 11 by the lateral sliding of the snaps 142 in the positioning slots 131, so that the user can get up and leave the space where the pedals 143 are swung away.

However, the swing-out range of the foot pedals 143 is limited by the lateral extension length of the positioning grooves 131, when the lateral extension length of the positioning grooves 131 is too short, the swing-out range of the foot pedals 143 from each other is insufficient, and a user cannot easily step on the ground with his feet when standing up, but when the lateral extension length of the positioning grooves 131 is too long, the mechanical strength of the foot bar 13 is reduced, and the service life is not long. In addition, the wheelchair 1 can be configured such that the snap-fastener 142 is hidden in the leg bar 13 by pressing the snap-fastener 142 as shown in fig. 3, and the mounting bar 141 can be further largely rotated in the leg bar 13, thereby further increasing the space generated after the pedals 143 are swung away from each other. However, this design is not only complicated in operation but also risks hurting the user's hand. Moreover, when the elastic buckle 142 is completely pressed and retracted into the mounting rod 141, the pedal unit 14 and the foot rod 13 are easily separated. The foot pedal 143 is not limited to be positioned, and although the foot pedal 143 can be swung away by force during use, if a person kicks the foot pedal 143, the foot pedal 143 will swing back and hit the ankle of the user. Therefore, the structural design of the wheelchair 1 still remains to be improved.

Disclosure of Invention

It is an object of the present invention to provide a wheelchair which overcomes at least one of the disadvantages of the background art.

The wheelchair of the invention comprises a chair frame mechanism and two pedal mechanisms, wherein the chair frame mechanism comprises a chair frame body and two foot rods arranged at the front side of the chair frame body, the pedal mechanisms are respectively arranged on the foot rods, each pedal mechanism can rotate and position between a stepping position and a swinging position relative to the respective foot rod, and comprises a pivot unit which can be pivoted and sleeved on the respective foot rod in a vertically-movable and rotating manner, a positioning unit which is arranged on the outer surface of the respective foot rod in a protruding manner and is embedded and clamped in the pivot unit, and a pedal unit arranged on the pivot unit, the pivot unit is provided with a moving groove which extends along the inner periphery thereof and is used for the positioning unit to be embedded and limited in a sliding manner, the moving groove is provided with a central groove section extending transversely, and a first groove section and a second groove section which respectively extend upwards from two ends of the central groove section, the pedal mechanisms can move upwards and rotate relative to the foot rods by the pivot unit, and the positioning unit moves downwards from the first groove section or the second groove section to the central groove section and moves along the central groove section, the treading position and the swinging position are changed, when the positioning unit is positioned at the treading position, the positioning unit is upwards embedded and clamped and limited at the first groove section, so that the treading unit is positioned at the front side of the chair frame body, and when the positioning unit is positioned at the swinging position, the positioning unit is upwards embedded and clamped and limited at the second groove section, so that the treading unit is positioned at the side of the chair frame body.

According to the wheelchair, each foot rod is provided with a through hole penetrating in the radial direction, the positioning unit is provided with a rod body inserted and positioned in the through hole and protruding out of the outer surface of the foot rod, and the rod body can move in the moving groove.

According to the wheelchair, the positioning unit is further provided with a plug block plugged in the rod body, and the plug block defines an installation channel which is communicated with the through hole and is used for inserting and positioning the rod body.

According to the wheelchair, the positioning unit is further provided with a nut which is assembled on the plug block and is coaxially communicated with the installation channel, and the rod body penetrates into the installation channel and is screwed with the nut.

The pivot unit of the wheelchair comprises a first shell and a second shell which is matched and assembled with the first shell and is pivoted and sleeved on the corresponding foot rods, wherein the first shell defines a first groove section and a first central groove area communicated with the first groove section, the second shell defines a second groove section and a second central groove area communicated with the second groove section, and the first central groove area and the second central groove area are matched to form the central groove section.

In the wheelchair of the present invention, each pedal mechanism further includes at least one bushing installed in the pivot unit and sleeved outside the leg bar.

In the wheelchair of the present invention, each pedal mechanism further includes two bushings installed in the pivot unit at an interval up and down.

In the wheelchair, each bushing is provided with a surrounding part which is sleeved on the foot rod in a sleeving manner, and a limiting part which extends outwards from the peripheral surface of the surrounding part, and the pivot unit is further provided with two limiting ring grooves for the embedding and positioning of the limiting parts of the bushings.

In the wheelchair, each pedal unit is provided with an extension rod connected to the pivot unit and a pedal plate capable of being pivotally connected to one end, far away from the pivot unit, of the extension rod in a swinging mode, each pedal plate can be switched between a use state and a folding state relative to the extension rod, the pedal plates are horizontally placed and can be used for treading in the use state, and the pedal plates swing against the extension rod and are vertically placed in the folding state.

The invention has the beneficial effects that: through the design of the pivot swinging and positioning between the positioning unit and the pivot unit, the pedal mechanism can swing at a large angle relative to the foot rods, so that a user can more safely and conveniently leave the wheelchair.

Drawings

Other features and effects of the present invention will become apparent from the following detailed description of the embodiments with reference to the accompanying drawings, in which:

figure 1 is a partially exploded perspective view of a known wheelchair;

FIG. 2 is a perspective view illustrating a pedal unit of the wheelchair mounted on a foot bar with a snap-fit of the pedal unit protruding into a positioning groove of the foot bar, the pedal unit swinging toward a side of a frame;

FIG. 3 is a perspective view illustrating the wheelchair with the snap fastener hidden in the foot bar and the pedal unit continuously swinging toward the side of the frame;

FIG. 4 is a perspective view of a wheelchair in accordance with a first embodiment of the present invention, with the two pedal mechanisms of the first embodiment in a pedaling position and the two pedals of the first embodiment in a use position;

FIG. 5 is an exploded perspective view illustrating the assembly of a foot bar, a pivot unit, a rod, two bushings, and a pedal unit according to the first embodiment;

FIG. 6 is a front sectional view illustrating the leg, the pivot unit and a positioning unit of the first embodiment in an installed state;

FIG. 7 is a top partial cross-sectional view illustrating the lever of the first embodiment positioned within a first slot segment of a moving slot of the pivot unit and the pedal mechanism positioned in the pedaling position;

FIG. 8 is a perspective view illustrating the first embodiment from another perspective with the pedal mechanism of the first embodiment in a swing-out position and the foot pedal in a folded state;

FIG. 9 is a top partial cross-sectional view illustrating the lever of the first embodiment positioned within a second slot segment of the moving slot of the pivot unit and the pedal mechanism in the swung-out position;

FIG. 10 is a front sectional view of the leg bar and the positioning unit in an installed state in accordance with a second embodiment of the wheelchair of the present invention;

figure 11 is a front partial cross-sectional view illustrating the foot bar and the positioning unit of a third embodiment of the wheelchair of the present invention in an installed state.

Detailed Description

Before the present invention is described in detail, it should be noted that in the following description, similar components are denoted by the same reference numerals.

Referring to fig. 4, 5 and 6, a wheelchair 2 according to a first embodiment of the present invention is adapted for a user to sit on and includes a frame mechanism 3 and two pedal mechanisms 4.

The orientation that the user faces when seated on the wheelchair 2 is defined as the front side, the orientation corresponding to the user's left hand is the left side, and so on for the rest of the orientations. The chair frame mechanism 3 comprises a chair frame body 31 suitable for a user to sit, two leg rods 32 installed at the front side of the chair frame body 31 at intervals left and right, two rotating wheels 33 arranged at the left and right sides of the chair frame body 31, and two auxiliary wheels 34 respectively arranged at the bottom edges of the leg rods 32 and used for assisting steering. Each leg 32 has a through hole 321 extending radially from side to side.

The pedal mechanisms 4 are respectively mounted on the foot rods 32, and each pedal mechanism 4 includes a positioning unit 41, a pivot unit 42, a pedal unit 43, and two bushings 44. The pedal mechanism 4 and the foot bar 32 located on the left side of the seat frame body 31 will be described as an example in the following description.

The positioning unit 41 of the pedal mechanism 4 is installed to protrude outward from the outer surface of the foot bar 32, and has a plug 413 inserted into the foot bar 32 and defining an installation channel 412 coaxially communicating with the through hole 321, a nut 414 installed in the foot bar 32 and communicating with the installation channel 412, and a rod 411 passing through the through hole 321 and inserted into the installation channel 412 and mutually screwed with the nut 414, wherein the rod 411 has a head portion 410 protruding and exposed out of the outer surface of the foot bar 32.

The pivot unit 42 is pivotally sleeved on the leg 32 in a manner of moving up and down and rotating, and is surrounded and sleeved on the positioning unit 41, and has a moving groove 423 concavely disposed on the inner peripheral surface thereof along the circumferential arc thereof, and allowing the head portion 410 of the rod 411 to be slidably inserted, and two limiting ring grooves 424 concavely disposed on the inner peripheral surface thereof, and respectively spaced at the upper and lower sides of the moving groove 423, and respectively allowing the bushing 44 to be embedded and limited.

In the first embodiment, the pivot unit 42 includes a first casing 421 and a second casing 422 that are engaged with each other in a left-right direction and are pivotally sleeved outside the leg 32, and the first casing 421 and the second casing 422 cooperate to define the moving groove 423 and the limiting ring groove 424.

The moving groove 423 has a central groove section 425 extending in a lateral arc shape on the inner circumferential surfaces of the first casing 421 and the second casing 422, a first groove section 426 extending upward from one end of the central groove section 425 and located in the first casing 421, and a second groove section 427 extending upward from the other end of the central groove section 425 and located in the second casing 422. The central trough section 425 has a first central trough region 428 located in the first housing 421 and in communication with the first trough section 426 and a second central trough region 429 located in the second housing 422 and in communication with the second trough section 427.

Each of the retaining ring grooves 424 has a first retaining groove region 401 disposed in the first casing 421, and a second retaining groove region 402 disposed in the second casing 422, wherein the first retaining groove region 401 and the second retaining groove region 402 are in end-to-end communication with each other and are assembled to form an annular groove.

It should be noted that the design of assembling the first casing 421 and the second casing 422 has the advantage of reducing the complexity of mounting the pivot unit 42 on the leg 32, however, in other variations of the first embodiment, the pivot unit 42 can be a single casing structure, and the moving groove 423 and the limiting ring groove 424 are formed on the inner side of the pivot unit 42 without disassembling the first casing 421 and the second casing 422.

The bushing 44 is installed in the pivot unit 42 at an interval from top to bottom and is sleeved outside the leg 32. Each bushing 44 has a surrounding portion 441 surrounding the leg 32, and a stopper portion 442 protruding radially outward from the outer peripheral surface of the surrounding portion 441 in a ring shape and fitted into the respective stopper ring groove 424. The bushing 44 is provided to reduce wear caused by the rotation of the pivot unit 42 and the leg 32 and to prolong the service life of the pivot unit 42. In the first embodiment, the bushing 44 is tightly fitted around the foot shaft 32, and the stopper 442 is loosely fitted and inserted into the stopper ring groove 424, but in other variations of the first embodiment, the bushing 44 may be loosely fitted around the foot shaft 32, and the stopper 442 is tightly fitted and inserted into the stopper ring groove 424.

The pedal unit 43 is locked and fixed to the pivot unit 42, and can be moved up and down and rotated with respect to the foot bar 32 by being linked with the pivot unit 42. The pedal unit 43 has an extension rod 431 extending in an up-and-down arc shape and having a top end portion locked to the pivot unit 42, and a foot pedal 432 pivotally connected to a bottom end portion of the extension rod 431 and adapted to be stepped on by a user's foot.

Referring to fig. 4 and 8, the pedal 432 is switchable between an operating state and a folded state with respect to the extension rod 431. When the foot pedal 432 is in the use state, it is horizontally placed (as shown in fig. 4) and can be stepped on by the user. When the foot rest 432 is in the folded state, it is pivoted up and leans against the extension rod 431 to be placed upright (as shown in fig. 8), which can save the storage space when storing the wheelchair 2.

It should be noted that there are many ways of swinging and folding the pedal 432 relative to the extension rod 431, such as changing the direction of the pivotal swing of the pedal 432, or adopting a design that the pedal 432 and the extension rod 431 can be separated from each other and then assembled for storage, which can achieve similar effects, and the folding manner of the first embodiment is not limited.

Referring to fig. 4, 5 and 7, the pedal mechanism 4 can move and rotate relative to the foot bar 32 by the pivot unit 42, and is rotatably positioned between a stepping position and a swinging position relative to the foot bar 32. In the step position, the head portion 410 of the rod 411 is upwardly engaged and limited in the first groove 426 of the moving groove 423, and the pedal unit 43 is positioned at the front side of the chair frame body 31, so that a user can sit on the chair frame body 31 and place his feet on the pedal 432.

When the pedal mechanism 4 is to move from the stepping position to the swing-away position, the pivot unit 42 is first driven to move upward along the foot rod 32, so that the head portion 410 of the rod 411 is separated downward from the first slot section 426 and enters the central slot section 425. The pivot unit 42 is then rotated relative to the foot bar 32 such that the head portion 410 moves along the central groove section 425 to below the second groove section 427 as the pivot unit 42 rotates.

Referring to fig. 5, 8 and 9, when the rod 411 moves below the second groove 427, the pivot unit 42 moves downward relative to the foot rod 32, so that the rod 411 moves upward relative to the second groove 427 for positioning, and at this time, the pedal mechanism 4 is located at the swing position relative to the foot rod 32, and the pedal unit 43 is located beside the chair frame body 31. When the pedal mechanisms 4 on the left and right sides are located at the swing-away position, the user will not be stumbled by the extension rod 431 or the pedal 432 when he wants to get up and leave the wheelchair 2, and the pedal unit 43 can be positioned without swinging by the insertion and limit of the head portion 410 in the first slot 426 and the second slot 427, so as to prevent the pedal unit 43 from swinging back and striking the foot of the user due to external force such as kicking by other people, prevent the user from kicking the pedal unit 43 away from the stepping position due to accidental force application, and improve the safety and convenience of the wheelchair 2 in use. When the user wants to move the pedal mechanism 4 from the swing position to the stepping position, the user only needs to reverse the above steps to return the head portion 410 of the rod 411 from the second slot 427 to the first slot 426, and the pedal unit 43 can be positioned at the front side of the seat frame body 31 again.

Referring to fig. 10, a second embodiment of the present invention has substantially the same structure as the first embodiment, except that: the positioning unit 41 and the leg bar 32 are assembled differently. In the second embodiment, the positioning unit 41 does not include the nut, but an internal thread is directly disposed in the mounting slot 412 of the plug 413, and the rod 411 is directly screwed into the plug 413. This design does not require the nut, which has the advantage of reducing the complexity of the structure of the plug 413, the difficulty of assembly, and the material cost required for assembly.

Referring to fig. 11, a third embodiment of the present invention has substantially the same structure as the second embodiment, except that: the positioning unit 41 and the leg bar 32 are assembled differently. In the third embodiment, the positioning unit 41 does not include the stopper and the nut, and the rod 411 is directly screwed on the foot rod 32. The advantage of this design is that the number of components required for assembly is reduced and the assembly is easier.

In summary, the wheelchair 2 of the present invention can make the pedal mechanism 4 swing at a large angle relative to the leg bar 32 by the structural design of the positioning unit 41 and the pivot unit 42, and the pedal unit 43 can be positioned without swinging by the engagement and the limitation of the head portion 410 in the first slot 426 and the second slot 427, so that the user can get up and leave the wheelchair 2 more safely and conveniently, and the operation is very simple and convenient, thereby achieving the purpose of the present invention. The bushing 44 can increase the wear resistance between the pivot unit 42 and the corresponding leg 32, thereby prolonging the service life of the wheelchair 2. The foldable design of the footrest 432 and the extension rod 431 allows the wheelchair 2 to be more space-saving when being stored.

The above description is only an example of the present invention, and the scope of the present invention should not be limited thereby, and the invention is still within the scope of the present invention by simple equivalent changes and modifications made according to the claims and the contents of the specification.

Claims

1. The utility model provides a wheelchair, contains chair frame mechanism, and two pedal mechanism, chair frame mechanism include the chair frame body, and two install in the foot bar of chair frame body front side, pedal mechanism installs respectively on the foot bar, its characterized in that: each pedal mechanism can rotate and position between a stepping position and a swinging position relative to the respective foot rod, and comprises a pivot unit which can be pivoted on the respective foot rod in a vertically moving and rotating manner, a positioning unit which is installed on the outer surface of the respective foot rod and is convexly arranged on the outer surface of the respective foot rod and is embedded and clamped in the pivot unit, and a pedal unit which is installed on the pivot unit, wherein the pivot unit is provided with a moving groove which extends along the inner periphery of the pivot unit and is used for slidably embedding and limiting the positioning unit, the moving groove is provided with a horizontal and transverse extending ditch-shaped central groove section, and a first groove section and a second groove section which respectively extend upwards from two ends of the central groove section, the pedal unit can be linked with the pivot unit and move upwards and rotate relative to the foot rod together with the pivot unit, so that the positioning unit moves downwards from the first groove section or the second groove section to the central groove section, and along central authorities groove section horizontal displacement, and trample the position with the swing changes between the position, when being located trample the position, the positioning unit is up inlay the card spacing in first groove section, and makes the footboard unit is positioned the chair frame body front side, when being located swing the position, the positioning unit is up inlay the card spacing in the second groove section, and makes the footboard unit is positioned chair frame body side.

2. The wheelchair of claim 1 wherein: each foot rod is provided with a through hole which penetrates through the foot rod in the radial direction, the positioning unit is provided with a rod body which is inserted into the through hole and is positioned in the through hole in a protruding mode and exposed out of the outer surface of the foot rod, and the rod body can move in the moving groove.

3. The wheelchair of claim 2 wherein: the positioning unit is also provided with a plug block plugged in the foot rod, and the plug block defines an installation channel communicated with the through hole and used for inserting and positioning the rod body.

4. The wheelchair of claim 3 wherein: the positioning unit is also provided with a screw cap which is assembled on the chock block and is coaxially communicated with the mounting channel, and the rod body penetrates into the mounting channel and is screwed with the screw cap.

5. The wheelchair of any one of claims 1 to 4 wherein: the pivot unit is provided with a first shell and a second shell which is matched and assembled with the first shell and is pivoted and sleeved on the corresponding foot rods, the first shell defines the first groove section and a first central groove area communicated with the first groove section, the second shell defines the second groove section and a second central groove area communicated with the second groove section, and the first central groove area and the second central groove area are matched to form the central groove section.

6. The wheelchair of claim 1 wherein: each pedal mechanism also comprises at least one bushing which is arranged in the pivot unit and sleeved outside the foot rod.

7. The wheelchair of claim 6 wherein: each pedal mechanism further includes two of the bushings mounted in the pivot unit in spaced relation one above the other.

8. The wheelchair of claim 7 wherein: each bush is provided with a surrounding part which is sleeved on the foot rod in a ring mode, and a limiting part which extends outwards from the outer peripheral surface of the surrounding part, and the pivot unit is further provided with two limiting ring grooves which are respectively used for the embedding and locating of the limiting part of the bush.

9. The wheelchair of claim 1 wherein: each pedal unit of the pedal mechanism is provided with an extension rod connected to the pivot unit and a pedal plate capable of being pivotally connected to one end, far away from the pivot unit, of the extension rod in a swinging mode, each pedal plate can be switched between a use state and a folding state relative to the extension rod, the pedal plates are horizontally placed and can be used for treading in the use state, and the pedal plates swing against the extension rod and are vertically placed in the folding state.