CN111513941B

CN111513941B - Wheelchair transmission structure with turning function and bidirectional force output

Info

Publication number: CN111513941B
Application number: CN201910104912.6A
Authority: CN
Inventors: 赖中生; 卢士一; 曾世昌
Original assignee: Chung Shan Medical University
Current assignee: Chung Shan Medical University
Priority date: 2019-02-01
Filing date: 2019-02-01
Publication date: 2022-08-09
Anticipated expiration: 2039-02-01
Also published as: CN111513941A

Abstract

A wheelchair transmission structure with turning function and bidirectional output comprises: the driving device has the function of relative swing of the first rod piece and the second rod piece by the pin joint of the first rod piece and the second rod piece, and forms positive and negative rotation driving to the driving wheel set by swing, so that the wheelchair can be driven to advance by the bidirectional driving, meanwhile, the first rod piece and the second rod piece are respectively provided with a turning shaft and a driving shaft in a penetrating way, the turning shaft is connected with the driving shaft by a flexible joint, the driving shaft can rotate to drive the turning shaft, and further the driving shaft can be rotated while the second rod piece swings, so that the forward operation and the turning operation of the wheelchair can be carried out without mutual influence, a user can carry out forward and turning actions by one hand, and the wheelchair has the effects of improving the operability and simplifying the structure.

Description

Wheelchair transmission structure with turning function and bidirectional force output

Technical Field

The invention relates to a transmission structure of a wheelchair, which can control the forward movement with a single hand and has the turning function and the bidirectional force.

Background

At present, the existing manual wheelchairs are all provided with a driving wheel at two sides of the wheelchair in an independent pivot mode, a holding ring is erected at the driving wheel, a user can hold the holding ring with two hands to directly drive the driving wheel, the wheelchair can be formed to move forward, when the wheelchair needs to turn, the user applies smaller thrust to the holding ring with one hand and applies larger thrust to the other holding ring with the other hand, the purpose of turning can be achieved through different rotating speeds of the two driving wheels, but the existing structure is detailed, and the existing structure cannot find that the existing structure has some defects, and the main reasons are as follows: the two hands of the user are driven by one output force, so that the user is difficult to flexibly advance, the user can feel more uncomfortable when climbing uphill, the wheelchair is more dangerous to overturn when moving backwards by itself, the user needs to stop moving the two hands backwards when pushing the grip ring forwards in two directions to the forefront, the wheelchair is made to operate at a speed which is suddenly slow, the wheelchair is uncomfortable to sit on, the repeated forward pushing of the grip ring is easy to cause fatigue and ache of the two hands, moreover, the user can only apply force to the grip ring by the two hands simultaneously when moving forwards, the wheelchair cannot be driven to advance by one hand, inconvenience in use is caused, and the defects are all technical problems to be improved by the wheelchair.

In view of the above, the present inventors have made various experiments on the manufacturing, development and design of related products for many years, and have made detailed design and careful evaluation to achieve the above objectives, and finally have obtained a practical invention.

Disclosure of Invention

The present invention provides a transmission structure of a wheelchair with turning function and bidirectional output, aiming at the above disadvantages of the prior art.

A wheelchair is provided with at least one front wheel and two rear wheels by a frame body, an output shaft is connected between the two rear wheels, the output shaft is provided with an output wheel, the frame body is parallel to the output shaft, a first cross rod, a second cross rod and a third cross rod are sequentially arranged in the direction of the front wheel, a front support arm is vertically arranged on one side of the second cross rod, a second rear support arm is vertically arranged on the third cross rod, a driving device comprises a first rod piece, a second rod piece and a flexible joint, the first rod piece is fixed on the second cross rod of the frame body, a right connecting piece and a left connecting piece symmetrically extend towards one end far away from the second cross rod of the first rod piece, a turning shaft penetrates through the first rod piece and is pivoted with the turning shaft to be connected with the front wheel to form turning operation, a right connecting piece and a left connecting piece symmetrically extend towards one end of the second rod piece, the right connecting piece is pivoted with the right group connecting piece to enable the second rod piece to swing relative to the first rod piece, the left connecting piece is fixedly provided with a driving shaft in a penetrating way and forms a pivoting connection with the left group connecting piece by the driving shaft, the driving shaft is additionally arranged on the front support arm in a penetrating way, the second rod piece is provided with a driving shaft in a penetrating way, one end of the driving shaft extends to form a handle, the other end of the driving shaft is connected with the flexible joint and is connected with the turning shaft by the flexible joint, the handle and the turning shaft can synchronously rotate by utilizing the flexible joint and cannot interfere the relative swing of the first rod piece and the second rod piece, a driving wheel set comprises a first rotating wheel, a first gear, a driven shaft, a second rotating wheel and a second gear, the first rotating wheel is arranged on the driving shaft through a first ratchet wheel to form a linkage state, and the first gear is fixed on the driving shaft, the driven shaft penetrates between the front support arm and the left assembling piece, the second rotating wheel is arranged on the driven shaft through a second ratchet wheel to form a positive rotation linkage state, the second gear is fixed on the driven shaft and is meshed with the first gear, the transmission wheel set comprises a first wheel body, a first belt body, a second wheel body, a second belt body, a third wheel body, a third belt body and a transmission shaft, the transmission shaft penetrates through the first wheel body, the second wheel body and the third wheel body, two ends of the transmission shaft are pivoted on the two rear support arms, the first wheel body is connected between the first rotating wheel and the first wheel body, the second wheel body is connected between the second rotating wheel and the second wheel body, and the third wheel body is connected between the third wheel body and the output wheel.

The first main objective of the present invention is that the driving device has the function of relative swing of the first rod and the second rod by the pivot connection of the first rod and the second rod, and forms a forward and reverse rotation driving of the driving wheel set by the swing, so that the two-way driving can drive the wheelchair to move forward, and the first rod and the second rod are respectively provided with a turning shaft and a driving shaft in a penetrating way, and the turning shaft is connected with the driving shaft by a flexible joint, so that the driving shaft can rotate to drive the turning shaft, and further the driving shaft can be rotated while the second rod swings, thus the forward operation and the turning operation of the wheelchair can be achieved without mutual influence, and the user can perform the forward and turning actions with one hand, thereby having the efficacy of improving the operability and simplifying the structure.

The second main objective of the present invention is that when the user controls the handle to swing back and forth, the driving shaft is linked by the second rod, so that the driving shaft can drive the first gear and the second gear to rotate the driven shaft in opposite directions, and then the forward swing of the handle can form the forward rotation linkage of the first rotating wheel through the one-way drivable characteristic of the first ratchet wheel and the second ratchet wheel, and the backward swing of the handle can form the forward rotation linkage of the second rotating wheel, at this time, the driving force can be selectively transmitted from the first belt body or the second belt body to the third wheel body, so that the third wheel body keeps the forward rotation direction to drive the rear wheel of the wheelchair, and the forward and backward pushing of the handle can drive the wheelchair to move forward, i.e. have the function of two-way transmission, so as to achieve the effect of labor saving operation of the wheelchair.

The third main objective of the present invention is to control the operation element to make the cam rotate to abut against the flat head of the cylinder, and push the cylinder to form the pressure block to press the second gear, thereby forming the position fixation of the driving shaft and the driven shaft, and further achieving the purpose of fixing the handle at a specific position, so as to switch to a no-swing state when the handle does not need to swing, or when the user needs to leave the wheelchair, the handle can be tilted forward, thereby preventing the handle from blocking the leaving action of the user, meanwhile, the handle still has the function of controlling the front wheel to turn, and the rear wheel can rotate forward without being affected, thereby having the function of being assisted to push the wheelchair.

Other objects, advantages and novel features of the invention will become apparent from the following detailed description of the invention when considered in conjunction with the drawings.

Drawings

Fig. 1 is a perspective view of the present invention.

Fig. 2 is a schematic structural view of the wheelchair of the present invention.

Fig. 3 is a perspective view of the driving device of the present invention.

Fig. 4 is a perspective view of the driving wheel set and the transmission wheel set of the present invention.

Fig. 5 is a schematic view (one) of the turning action of the present invention.

Fig. 6 is a schematic view (ii) of the turning operation of the present invention.

FIG. 7 is a schematic view of the back pushing of the grip of the present invention.

Fig. 8 is a schematic view of the forward rotation driving of the second rotating wheel according to the present invention.

FIG. 9 is a schematic view of the forward pushing of the grip of the present invention.

FIG. 10 is a schematic view of the forward rotation driving of the first wheel according to the present invention.

FIG. 11 is a schematic view (I) of the operation state of the control device according to the present invention.

Fig. 12 is a schematic view (two) of the usage status of the control device of the present invention.

Fig. 13 is a schematic view (three) of the usage state of the control device of the present invention.

Fig. 14 is a schematic view (iv) of the usage state of the control device of the present invention.

Description of the symbols:

[ present invention ]

Wheelchair- -10

Frame- - -11

Front wheel-12

Rear wheel- -13

Output shaft-131

Output wheel- -14

First Cross-Bar 15

Second Cross-Bar 16

Front arm-161

Third Cross-bar 17

Rear arm-171

Driving device-20

First bar-21

Right set of tabs-211

Support portion- - (211a) (212a)

Left set of tabs-212

Second bar-22

Right connecting piece-221

Left connecting piece-222

Flexible joint-23

Turn shaft-24

Turn connecting rod-25

Driving shaft- - -26

Driving shaft-27

Handle-271

Driving wheel set- - -30

First runner- - -31

First ratchet wheel- -311

First gear-32

Driven shaft-33

Second runner- - -34

Second ratchet wheel- - -341

Second Gear-35

Driving wheel set-40

First wheel body-41

First belt-42

Second wheel body- - -43

Second belt-44

Third wheel body- - -45

Third belt-46

Transmission shaft- - -47

Control device-50

Pressure block- -51

Cylinder-52

Flat head portion-521

Operating member-53

Cam- -531

First plane-531 a

Second plane-531 b

Case-54

Spring-55

Platform- -56

Rail-561.

Detailed Description

For a better understanding and appreciation of the objects, features, and advantages of the present invention, reference is made to the following detailed description taken in conjunction with the accompanying drawings in which:

referring to fig. 1 to fig. 5, a transmission structure of a wheelchair with turning function and bidirectional force comprises: a wheelchair 10, a driving device 20, a driving wheel set 30, a transmission wheel set 40 and a control device 50, the wheelchair 10 has a frame 11 with at least a front wheel 12 and two rear wheels 13, an output shaft 131 is connected between the two rear wheels 13, the output shaft 131 has an output wheel 14, the frame 11 is parallel to the output shaft 131 and sequentially provided with a first cross bar 15, a second cross bar 16 and a third cross bar 17 towards the front wheel 12, a front support arm 161 is vertically arranged at one side of the second cross bar 16, two rear support arms 171 are vertically arranged at the third cross bar 17, the driving device 20 includes a first bar 21, a second bar 22 and a flexible joint 23, the first bar 21 is fixed on the second cross bar 16 of the frame 11, further, the first bar 21 penetrates the second cross bar 16, and the first bar 21 and the second bar 16 are fixed by welding, a right set of connecting pieces 211 and a left set of connecting pieces 212 symmetrically extend from the end of the first rod 21 away from the second crossbar 16, the right set of connecting pieces 211 and the left set of connecting pieces 212 of the first rod 21 both form a supporting portion (211a) (212a), the first rod 21 presses against the second crossbar 16 with the two supporting portions (211a) (212a), so as to stably fix the driving device 20 to the wheelchair 10, the first rod 21 is pivotally provided with a turning shaft 24, the number of front wheels 12 of the wheelchair 10 is two, the turning shaft 24 and the front wheels 12 are connected by a turning connecting rod 25, and the turning shaft 24 is connected with the front wheels 12 to form turning operation, the second rod 22 symmetrically extends towards one end with a right connecting piece 221 and a left connecting piece 222, and the right connecting piece 221 is pivotally connected with the right set of connecting pieces 211, so that the second rod 22 can swing relative to the first rod 21, the left connecting piece 222 is fixed with a driving shaft 26, the driving shaft 26 is pivoted with the left assembling piece 212, the driving shaft 26 is further inserted into the front supporting arm 161, the second rod 22 is inserted with a driving shaft 27, one end of the driving shaft 27 extends to form a handle 271, the other end of the driving shaft 27 is connected with the flexible joint 23, the flexible joint 23 is connected with the turning shaft 24, the flexible joint 23 enables the handle 271 and the turning shaft 24 to synchronously rotate, and does not interfere with the relative swing of the first rod 21 and the second rod 22, a driving wheel set 30 comprises a first rotating wheel 31, a first gear 32, a driven shaft 33, a second rotating wheel 34 and a second gear 35, the first rotating wheel 31 is arranged on the driving shaft 26 through a first ratchet 311 to form a forward rotation linkage state, and the first gear 32 is fixed on the driving shaft 26, the driven shaft 33 is disposed between the front arm 161 and the left connecting plate 212, and the second wheel 34 is disposed on the driven shaft 33 through a second ratchet 341 to form a forward rotation linkage state, the second gear 35 is fixed on the driven shaft 33 and meshed with the first gear 32, a transmission wheel set 40 includes a first wheel 41, a first belt 42, a second wheel 43, a second belt 44, a third wheel 45, a third belt 46 and a transmission shaft 47, the first belt 42, the second belt 44 and the third belt 46 are all belt or chain structures, the transmission shaft 47 is disposed through the first wheel 41, the second wheel 43 and the third wheel 45, and is pivoted to the two rear arms 171 by two ends of the transmission shaft 47, the first belt 42 is connected between the first wheel 31 and the first wheel 41, and the second belt 44 is connected between the second wheel 34 and the second wheel 43, the third belt 46 is connected between the third wheel 45 and the output wheel 14, the driving wheel set 40 drives the first wheel 41 and the second wheel 43 respectively by the forward rotation of the first wheel 31 and the second wheel 34, and the output shaft 131 can be driven to generate power output effect when the handle 271 is swung in two directions, the frame 11 of the wheelchair 10 is provided with a control device 50, the control device 50 is provided with a pressure block 51, the pressure block 51 can be a plastic or rubber block, and the pressure block 51 can be controlled to press the second gear 35, so as to form the rotation-proof fixation of the driven shaft 33 and the driving shaft 26, and fix the handle 271 at a specific swing angle position, wherein one end of the pressure block 51 is connected with a cylinder 52, the cylinder 52 is arranged between the first cross bar 15 and the second cross bar 16, the first cross bar 15 is provided with an operating part 53, the operating member 53 is linked with the cylinder 52 and the pressure block 51 to form a reciprocating displacement, a cam 531 is formed at one end of the operating member 53, a flat head 521 is formed on the cylinder 52, the cam 531 abuts against the flat head 521, the cam 531 and the flat head 521 are both accommodated in a housing 54, and the cylinder 52 is sleeved with a spring 55, the spring 55 is pressed between the housing 54 and the flat head 521, a platform 56 is protruded from the second rail 16, and the platform 56 forms a track 561, the platform 56 supports the pressure block 51 with the rail 561 and provides a sliding assistance function, and the cam 531 is formed with a first plane 531a and a second plane 531b, the first plane 531a abuts against the flat head 521 of the cylinder 52 to form a fixed position where the pressure block 51 presses the second gear 35, the second plane 531b abuts against the flat head 521 of the cylinder 52 to form a fixed position where the pressure block 51 does not press the second gear 35.

In practical use, as shown in fig. 1 to fig. 6, the driving device 20 is fixed to the second cross bar 16 of the frame 11 by the first rod 21, and the second rod 22 is pivotally connected to the first rod 21, the flexible joint 23 is connected to the turning shaft 24 of the first rod 21 and the driving shaft 27 of the second rod 22, the turning shaft 24 is further connected to the front wheel 12 of the wheelchair 10 by the turning link 25, when the handle 271 is rotated, the driving shaft 27 is rotated in the second rod 22 and drives the flexible joint 23 to rotate synchronously, so as to directly drive the turning shaft 24 to rotate in the first rod 21, thereby driving the front wheel 12 to control the advancing direction of the wheelchair 10 by the turning link 25, and as shown in fig. 7 to fig. 10, the left connecting piece 222 of the driving device 20 extends the driving shaft 26, and the driving shaft 26 is provided with the first driving shaft 31 and the first gear 32, the driving wheel set 30 engages the first gear 32 with the second gear 35, the first wheel 31 is connected to the first wheel 41 of the transmission wheel set 40 with the first belt 42, the second wheel 34 of the driving wheel set 30 is connected to the second wheel 43 with the second belt 44, and is connected to the third wheel 45 and the output wheel 14 of the rear wheel 13 via the third belt 46, when the user controls the handle 271 to swing backward, the driving shaft 26 is linked by the second rod 22, so that the driving shaft 26 can drive the first gear 32 and the second wheel 35, the first wheel 31 is kept still due to the unidirectional linkage of the first ratchet wheel 311, the second wheel 35 drives the second wheel 34 via the driven shaft 33, and the second wheel 34 is positively rotated due to the unidirectional linkage of the second ratchet wheel 341, at this time, the second wheel 34 is positively rotated via the second belt 44, The second wheel 43, the transmission shaft 47, the third wheel 45, the third belt 46, the output wheel 14 and the output shaft 131 sequentially transmit the driving force to the rear wheel 13, so as to form the forward driving of the wheelchair 10 when the second rod 22 swings backward, wherein the relative swing of the first rod 21 and the second rod 22 can make the handle 271 swing and rotate simultaneously through the twistable characteristic of the flexible joint 23, thereby having the turning function and the function of swinging and driving the wheelchair 10, similarly, when the handle 271 swings forward, the second wheel 34 loses the power transmission function due to the second ratchet 341, and the first wheel 31 sequentially transmits the driving force to the output shaft 131 through the connection of the first ratchet 311 from the first wheel 42, the first wheel 41, the transmission shaft 47, the third wheel 45, the third belt 46 and the output wheel 14, further, the second rod 22 swings forward to form the forward driving of the wheelchair 10, so as to achieve the effects of two-way driving and labor-saving driving, and the present invention integrates the driving device 20, the driving wheel set 30 and the transmission wheel set 40, so that the forward operation and the turning operation of the wheelchair 10 will not be affected by each other, thereby improving the practicability.

To further explain the usage, please refer to fig. 11, 12, 13, and 14 with reference to fig. 1, the frame 11 is provided with the housing 54 at the first cross bar 15, the housing 54 accommodates the flat head 521 of the cylinder 52 and the cam 531 of the operating element 53, the spring 55 is clamped between the housing 54 and the flat head 521, the cylinder 52 extends to the second cross bar 16, and the pressure block 51 is slidably disposed on the track 561 of the platform 56, when the angular position of the second rod 22 needs to be fixed, the operating element 53 is controlled to rotate the cam 531 to make the first flat surface 531a contact with the flat head 521 of the cylinder 52, the cam 531 pushes the cylinder 52 to form the pressure block 51 to press the second gear 35, thereby forming the position fixing of the driving shaft 26 and the driven shaft 33, and the driving shaft 26 is integrally connected to the second rod 22 of the driving device 20, therefore, the purpose of fixing the handle 271 at a specific position is achieved, and when the handle 271 does not need to be swung, the handle 271 can be switched to a swing-prohibited state, or when the user needs to leave the wheelchair 10, the handle 271 can be tilted forward, so as to prevent the handle 271 from blocking the user's leaving action, and at the same time, the handle 271 still has the function of controlling the front wheel 12 to turn, and the rear wheel 13 can rotate forward without being affected, so that the handle has the function of being assisted to push the wheelchair 10, and similarly, the operating element 53 is controlled to rotate the cam 531 so that the second plane 531b abuts against the flat head 521 of the column 52, so that the column 52 can be pulled back by the elastic force of the spring 55, and the pressure block 51 can return to the second rod 22 to a swing state without pressing the second gear 35.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the scope of the invention; therefore, all the equivalent changes and modifications made according to the claims of the present invention should be covered by the scope of the present invention.

Claims

1. The utility model provides a have wheelchair transmission structure of turning function and two-way power of exerting oneself concurrently which characterized in that, it includes:

the wheelchair is provided with at least one front wheel and two rear wheels by a frame body, an output shaft is connected between the two rear wheels and is provided with an output wheel, the frame body is parallel to the output shaft, a first cross rod, a second cross rod and a third cross rod are sequentially arranged towards the direction of the front wheels, a front support arm is vertically arranged on one side of the second cross rod, and two rear support arms are vertically arranged on the third cross rod;

a driving device, which comprises a first rod, a second rod and a flexible joint, wherein the first rod is fixed on the second cross rod of the frame body, the first rod symmetrically extends to one end far away from the second cross rod to form a right connecting piece and a left connecting piece, the first rod is pivoted with a turning shaft and connected with the front wheel through the turning shaft to form turning operation, the second rod symmetrically extends to one end to form a right connecting piece and a left connecting piece, the right connecting piece is pivoted with the right connecting piece to enable the second rod to swing relative to the first rod, the left connecting piece is fixedly provided with a driving shaft in a penetrating way and forms pivoting connection with the left connecting piece through the driving shaft, the driving shaft is further arranged in the front support arm in a penetrating way, the second rod is provided with a driving shaft in a penetrating way, one end of the driving shaft extends to form a handle, and the other end of the driving shaft is connected with the flexible joint, the flexible joint is connected with the turning shaft, the handle and the turning shaft can synchronously rotate by utilizing the flexible joint, and the relative swing of the first rod piece and the second rod piece is not interfered;

a driving wheel set, which includes a first wheel, a first gear, a driven shaft, a second wheel and a second gear, wherein the first wheel is set on the driving shaft through a first ratchet wheel to form a positive rotation linkage state, the first gear is fixed on the driving shaft, the driven shaft is set between the front support arm and the left assembling sheet, and the second wheel is set on the driven shaft through a second ratchet wheel to form a positive rotation linkage state, and the second gear is fixed on the driven shaft and meshed with the first gear; and

a transmission wheel set, the transmission wheel set includes a first wheel body, a first belt body, a second wheel body, a second belt body, a third wheel body, a third belt body and a transmission shaft, the transmission shaft penetrates through the first wheel body, the second wheel body and the third wheel body, and two ends of the transmission shaft are pivoted on two rear supporting arms, the first wheel body is connected between the first rotating wheel and the first wheel body, the second wheel body is connected between the second rotating wheel and the second wheel body, the third wheel body is connected between the third wheel body and the output wheel, the transmission wheel set enables the positive rotation linkage of the first rotating wheel and the second rotating wheel to respectively drive the first wheel body and the second wheel body, and further the handle can drive the output wheel to generate power output effect when swinging in two directions.

2. The transmission structure of claim 1, wherein the first belt, the second belt and the third belt are belts or chains.

3. The transmission structure of claim 1, wherein the number of the front wheels of the wheelchair is two, and the turning shaft is connected to the front wheels by a turning link.

4. The transmission structure of claim 1, wherein the first rod extends through the second cross bar, and the first rod and the second rod are fixed by welding.

5. The transmission structure of claim 4, wherein the right set of connecting pieces and the left set of connecting pieces of the first rod form a supporting portion, and the first rod is pressed against the second cross bar by the two supporting portions.

6. The transmission structure of a wheelchair with a turning function and a bi-directional output as claimed in claim 1, wherein the frame of the wheelchair is provided with a control device, and the control device is provided with a pressure block and controls the pressure block to press the second gear, thereby forming an anti-rotation fixing of the driven shaft and the driving shaft and fixing the handle at a specific swing angle position.

7. The transmission structure of claim 6, wherein one end of the pressure block is connected to a post disposed between the first cross bar and the second cross bar, and the first cross bar is provided with an operating member, and the operating member drives the post and the pressure block to move reciprocally.

8. The transmission structure of a wheelchair having a turning function and a bi-directional output as claimed in claim 7, wherein the operating member has a cam formed at one end thereof, the column has a flat head portion against which the cam abuts, the cam and the flat head portion are both accommodated in a housing, and the column is sleeved with a spring and pressed between the housing and the flat head portion by the spring.

9. The transmission structure of claim 8, wherein the second cross bar is provided with a platform, and the platform forms a track, and the platform supports the pressure block with the track and provides a sliding assistance function.

10. The structure of claim 8, wherein the cam defines a first plane and a second plane, the first plane abutting against the flat head of the cylinder to define a fixed position where the pressure block presses the second gear, and the second plane abutting against the flat head of the cylinder to define a fixed position where the pressure block does not press the second gear.