CN111973353A

CN111973353A - Electric wheelchair with front suspension arm and power frame pivoted respectively and elastically linked with frame

Info

Publication number: CN111973353A
Application number: CN201910422105.9A
Authority: CN
Inventors: 伍必翔
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-05-21
Filing date: 2019-05-21
Publication date: 2020-11-24
Anticipated expiration: 2039-05-21
Also published as: CN111973353B

Abstract

The invention is an electric wheelchair with a front suspension arm and a power frame which are pivoted respectively and are elastically linked with a frame, comprising: the bicycle comprises a frame, two front guide units, two power units, two anti-tilting units, two first shock absorption units, two second shock absorption units and three shock absorption units; the front cantilever of the front guide unit and the power frame of the power unit are pivoted on the frame respectively, when the front guide wheel of the front guide unit rises for an obstacle, the front cantilever is pivoted by an angle, and the power frame generates elastic buffering jacking force through the first shock absorption unit, so that a power source on the power frame and the power wheel are stressed simultaneously, the downward ground grabbing force of the power wheel is improved, the power frame is pressed to the frame through the strain unit, the frame is displaced in the same direction, the stability of the frame is improved, and the purposes of improving the safety and comfort when the electric wheelchair crosses the obstacle are achieved.

Description

Electric wheelchair with front suspension arm and power frame pivoted respectively and elastically linked with frame

Technical Field

The present invention relates to an electric wheelchair, and more particularly to an electric wheelchair having a front suspension arm and a power frame which are pivoted to each other and elastically linked with a frame.

Background

Since electric wheelchairs are necessary tools for elderly people or mobility-handicapped people to ride instead of walk, and since general road surfaces have obstacles such as undulation and irregular bumpiness, for example, stairs and a protruded road surface, the conventional electric wheelchairs have the ability to ride over the obstacles, and therefore, safety and comfort of the electric wheelchairs are very important when riding over the obstacles.

As shown in fig. 1, US9,913,768 shows an electric wheelchair, which mainly comprises a front suspension arm 111 of a front guide unit 11 fixed on a frame 12, the frame 12 pivoted with a rear suspension arm 131 of an anti-roll unit 13, a shock absorbing unit 14 between the frame 12 and the rear suspension arm 131, and a power unit 15 fixed on the rear suspension arm 131, so that when the front guide wheel 112 of the front guide unit 11 is lifted up due to an obstacle, the front suspension arm 111 and the frame 12 are lifted up simultaneously and pivoted at an angle relative to the rear suspension arm 131, and the pivoted frame 12 is pressed against the rear suspension arm 131 by the shock absorbing unit 14 to prevent the rear suspension arm 131 and the power unit 15 thereon from being lifted up, thereby ensuring the safety of the electric wheelchair when crossing the obstacle.

However, since the front suspension arm 111 is fixed to the frame 12 so that the two are integrally connected, generally speaking, the seat (not shown) is fixed to the frame 12, and therefore, when the front guide wheel 112 is lifted up due to an obstacle, the front suspension arm 111, the frame 12 and the seat are lifted up at the same time, which affects the comfort of the user in the seat and increases the fear of the user getting over the obstacle.

Secondly, when the front guide wheel 112 is lifted due to an obstacle, the front suspension arm 111 and the frame 12 pivot at an angle relative to the rear suspension arm 131, and the pivoted frame 12 is pressed against the rear suspension arm 131 by the shock absorption unit 14, so that the power unit 15 is prevented from being lifted and losing the grip capability, and therefore, when the electric wheelchair crosses the obstacle, the defect of insufficient safety when crossing the obstacle is highlighted because the lifting of the power unit 15 is indirectly and not true.

Disclosure of Invention

The invention aims to provide an electric wheelchair which is provided with a front suspension arm and a power frame which are pivoted respectively and elastically linked with a frame, and mainly improves the safety and the comfort when the electric wheelchair crosses obstacles.

In order to achieve the above object, the present invention provides an electric wheelchair having a front suspension arm and a power frame which are pivoted respectively and elastically linked with a frame, comprising: a frame having a front frame portion, a rear frame portion and a frame linkage portion between the front and rear frame portions; two front guide units respectively pivoted on two sides of the frame and respectively provided with a front cantilever and a front guide wheel which can be rotatably arranged on the front cantilever, wherein the front cantilever is provided with a front cantilever pivot part pivoted on the front frame part; two power units which are respectively pivoted on two sides of the frame and are respectively provided with a power frame, a power source fixed on the power frame and a power wheel driven by the power source, wherein the power frame is provided with a power frame pivot part pivoted on the front frame part; two anti-tilting units respectively pivoted on the rear frame part; the two first shock absorption units are respectively arranged between the front cantilever and the power frame; two strain units respectively arranged between the power frame and the frame linkage part; and two second shock absorbing units respectively arranged between the frame linkage part and the anti-tilting unit;

Therefore, when the electric wheelchair crosses over an obstacle, the front guide wheel rises for the obstacle, the front cantilever pivots at an angle by taking the front cantilever pivot part as the center, the power frame generates elastic buffering jacking force through the first shock absorption unit, so that a power source and a power wheel on the power frame are stressed simultaneously to improve the downward ground gripping force of the power wheel, and the power frame presses the frame linkage part through the strain unit, so that the frame is displaced in the same direction, the stability of the frame is improved, and the purposes of improving the safety and comfort when the electric wheelchair crosses over the obstacle are achieved.

Preferably, the front suspension arm pivot part of each front suspension arm has a first pivot center, the power frame pivot part of each power frame has a second pivot center, each power wheel has a rolling center, the rolling center is higher than the first and second pivot centers, and the joint of the first suspension unit and the power frame is higher than the rolling center. Therefore, the amount of downward pressure generated on the power wheel and the frame when the front guide wheel rises is more reliable.

Preferably, the front cantilever pivot part of the front cantilever and the power frame pivot part of the power frame are coaxially or non-coaxially arranged on the front frame part.

Preferably, each power frame further comprises a power frame fixing portion and a power frame extending portion connected to the power frame fixing portion, each power source is respectively and fixedly arranged on the power frame fixing portion, and each first shock-absorbing unit is respectively arranged between the front cantilever and the power frame extending portion; each strain unit is respectively arranged between the power frame extension part and the frame linkage part.

Preferably, each of the strain units is a rubber block. Therefore, the transmission of the power frame to the frame is more linear, and the stability and the comfort of the electric wheelchair when crossing obstacles are improved.

Preferably, each of the strain units includes an adjustable screw and a rubber block fixedly mounted on the adjustable screw, the adjustable screw can be disposed on the power frame away from or close to the vehicle frame linkage portion, and the rubber block is fixedly mounted on the adjustable screw and abuts against the vehicle frame linkage portion. By adjusting and controlling the sensitivity of the power frame force transmitted to the frame, the stability and the comfort of the electric wheelchair when crossing obstacles are improved.

Preferably, each of the first and second shock absorbing units and each of the strain units are shock absorbers.

Preferably, each of the anti-roll units includes a rear suspension arm and an anti-roll wheel rotatably disposed on the rear suspension arm, wherein the rear suspension arm has a rear suspension arm pivot portion pivotally disposed on the rear frame portion, and each of the second suspension units is disposed between the frame linkage portion and the rear suspension arm pivot portion.

Preferably, the frame further has two lower protrusions disposed at two sides of the front frame portion, and the two front cantilevers further have upper protrusions correspondingly abutting against the lower protrusions. So as to prevent the front guide wheel from contacting with a plane when the electric wheelchair is on the plane. More preferably, the device further comprises an adjusting piece, wherein the adjusting piece is arranged on the lower convex part in a lifting manner and is provided with an adjusting end part which supports the upper convex part. So as to adjust the distance between the front guide wheel and the plane and regulate and control the height of the electric wheelchair crossing the obstacle.

Drawings

Figure 1 is a drawing of an electric wheelchair of US 9,913,768B 2;

FIG. 2 is an overall external view of the first embodiment of the present invention, showing a state where a seat is installed;

FIG. 3 is a perspective view of a first embodiment of the present invention;

FIG. 4 is a top view of a first embodiment of the present invention;

FIG. 5 is a side view of a first embodiment of the present invention;

FIG. 6 is a partial perspective view of a first embodiment of the present invention;

FIG. 7 is a partial cross-sectional view of the first embodiment of the present invention, showing the front suspension arm resting on the frame;

FIG. 8 is a side elevational view of a first embodiment of the present invention, showing an electric wheelchair in a position for traversing an obstacle;

FIG. 9 is an enlarged view of a portion of a first embodiment of the present invention, showing the strain element in an adjustable state;

FIG. 10 is a bottom view of the second embodiment of the present invention, showing the front suspension arm and the power frame coaxially disposed on the vehicle frame;

FIG. 11 is an enlarged view of a portion of a third embodiment of the present invention, showing a state in which the strain element is a shock absorber.

Description of the symbols in the drawings:

the prior art is as follows:

front cantilever 111 of leading unit 11

Front guide wheel 112 frame 12

Anti-roll unit 13 rear cantilever 131

Suspension unit 14 power unit 15

The invention comprises the following steps:

front frame part 21 of frame 20

Rear frame part 22 and frame linkage part 23

Seat tube 24 seat 25

Lower protrusion 26 leading unit 30

Front arm 31 front arm pivot 311

Upper convex part 312 front guide wheel 32

Power unit 40 power frame 41

Power frame pivot 411 power frame fixing part 412

Power frame extension 413 power source 42

Anti-tilting unit 50 for power wheel 43

Rear boom 51 rear boom pivot portion 511

Anti-roll wheel 52 first shock absorbing unit 60

End 61 and the other end 62

Adjustable screw 71 of strain unit 70

End 73 of rubber block 72

The other end 74 of the second suspension unit 80

End 81 and the other end 82

The adjuster 91 adjusts the end 911

Detailed Description

The technical solutions of the present invention will be described clearly and completely below, and it should be apparent that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

The first embodiment is as follows:

As shown in fig. 2 to 6, an embodiment of the present invention provides an electric wheelchair having a front suspension arm and a power frame that pivot respectively and elastically linked with the frame, which mainly comprises a frame 20, two front guiding units 30, two power units 40, two anti-tilting units 50, two first shock absorbing units 60, two strain units 70, and two second shock absorbing units 80, wherein:

a frame 20 composed of a plurality of rod members and having a front frame portion 21, a rear frame portion 22, and a frame interlocking portion 23 located between the front and

rear frame portions

21, 22; in this embodiment, as shown in fig. 2, the frame 21 is provided with a seat tube 24 for assembling a seat 25; as shown in fig. 7, frame 20 further includes two lower projections 26 provided on both sides of front frame portion 21.

Two front guide units 30 respectively pivoted to both sides of the frame 20 and each having a front suspension arm 31 and a front guide wheel 32 rotatably provided on the front suspension arm 31, wherein the front suspension arm 31 has a front suspension arm pivot portion 311 pivoted to the front frame portion 21; in this embodiment, as shown in fig. 7, the two front cantilevers 31 further have upper protrusions 312 correspondingly abutting against the lower protrusions 26 to prevent the front guide wheels 32 from contacting the plane when the electric wheelchair is in the plane, which is shown in fig. 5.

Two power units 40 are respectively pivoted on two sides of the frame 20, and each power unit has a power frame 41, a power source 42 fixed on the power frame 41, and a power wheel 43 driven by the power source 42, wherein the power frame 41 has a power frame pivot portion 411 pivoted on the front frame portion 21, a power frame fixing portion 412 connected to the power frame pivot portion 411, and a power frame extending portion 413 connected to the power frame fixing portion 412 and forming a distance corresponding to the frame linking portion 23, wherein the power source 42 is a motor and is fixed on the power frame fixing portion 412.

Two anti-roll units 50 respectively pivoted to the rear frame part 22; in this embodiment, each anti-roll unit 50 includes a rear suspension arm 51 and an anti-roll wheel 52 rotatably disposed on the rear suspension arm 51, wherein the rear suspension arm 51 has a rear suspension arm pivot portion 511 pivotally disposed on the rear frame portion 22.

Two first shock absorbing units 60 respectively arranged between the front suspension arm 31 and the power frame 41; in this embodiment, each first suspension unit 60 is a suspension with a compression spring, and one end 61 of the first suspension unit 60 is disposed on one side of the power frame extension 413, and the other end 62 of the first suspension unit 60 is blocked between the front guide wheel 32 and the front suspension pivot 311 of the front suspension arm 31.

Two strain units 70 respectively arranged between the power frame extension part 413 and the frame linkage part 23; in this embodiment, each strain unit 70 includes an adjustable screw 71 and a rubber block 72 fixed on the adjustable screw 71, the adjustable screw 71 can be arranged on the power frame extension 413 away from or close to the frame linkage portion 23, and the rubber block 72 is fixed on the adjustable screw 71 and abuts against the frame linkage portion 23; of course, in other embodiments, the strain gauge 70 may be implemented by a rubber block alone.

Two second shock absorbing units 80 respectively disposed between the frame linking portion 23 and the anti-roll unit 50; in this embodiment, each second suspension unit 80 is a suspension with a compression spring, and one end 81 of the second suspension unit 80 is assembled to the frame linking portion 23, and the other end 82 of the second suspension unit 80 is blocked to the rear suspension arm 51 and located between the anti-roll wheel 52 and the rear suspension arm pivot portion 511.

Therefore, the pivoting torque generated by the front suspension arm 31 is transmitted to the power frame 41 through the first suspension unit 60, the pivoting torque generated by the power frame 41 is transmitted to the frame 12 through the strain unit 70, and the pivoting torque generated by the frame 12 is transmitted to the anti-roll unit 13 through the second suspension unit 80.

The above is a description of the structure and configuration of the main components of the embodiment of the present invention. The operation and effects of the first embodiment of the present invention are described as follows.

As shown in fig. 5, 6 and 8, when the electric wheelchair crosses an obstacle, the front guide wheel 32 is blocked by the obstacle and ascends, the front suspension arm 31 pivots clockwise by an angle around the front suspension arm pivot portion 311, at this time, the front suspension arm 31 pivoting by an angle presses the first suspension unit 60 upwards, the generated pivoting torque is transmitted to the power frame 41 from the first suspension unit 60, so as to generate the force for elastically buffering and pressing the power frame 41, the power frame 41 pivots clockwise by an angle around the power frame pivot portion 411, so that the power source 42 on the power frame 41 and the power wheel 43 are simultaneously stressed, and the downward grip of the power wheel 43 is improved. Meanwhile, the power frame 41 is pressed to the frame linkage part 23 by the strain unit 70, so that the frame 20 is displaced and pressed in the same direction, the stability of the frame 20 is increased, and the purpose of improving the safety and the comfort of the electric wheelchair when crossing obstacles is achieved.

As can be seen, when the front guide wheels 32 rise due to an obstacle, the front suspension arms 31 do not rise together with the frame 20 and the seat 25, but the center of gravity of the frame 20 slightly falls, so that discomfort of a user on the seat 25 is effectively avoided, and the fear of the user being over-obstacle is reduced. Secondly, when the front guide wheel 32 is lifted up when encountering an obstacle, the front suspension arm 31 directly transmits the pivoting torque to the power frame 41 through the first shock absorption unit 60, so that the power source 42 and the power wheel 43 on the power frame 41 are stressed simultaneously, the downward gripping force of the power wheel 43 is improved, the lifting of the power unit 40 is restrained, and the safety when crossing the obstacle is effectively improved.

It should be noted that, in the present embodiment, the strain unit 70 is a block made of rubber, so that when the strain unit 70 is a rubber block 72 and is disposed between the power frame extension 413 and the frame linkage portion 23, the strain unit has a characteristic of small deformation, so as to reduce the shaking degree between the power frame 41 and the frame 20 and increase the stability of the electric wheelchair when crossing obstacles. On the other hand, in the present embodiment, the strain element 70, which is the rubber block 72, is used as a medium for transmitting force between the power frame 41 and the vehicle body frame 20, so that noise generated between the power frame 41 and the vehicle body frame 20 can be greatly reduced.

It should be noted that, as shown in fig. 5, in the present embodiment, the front suspension arm pivot portion 311 of each front suspension arm 31 has a first pivot center C1, the power frame pivot portion 411 of each power frame 41 has a second pivot center C2, each power wheel 43 has a rolling center C3, the rolling center C3 is higher than the first and second pivot centers C1, C2, and the joint C4 between the first suspension unit 60 and the power frame extension 413 is higher than the rolling center C3, so that the pressing force generated to the power wheel 43 and the frame 20 when the front wheel ascends due to an obstacle is more reliable.

In the process of displacement and compression of the frame 20, the generated pivoting torque is also transmitted from the second shock absorbing unit 80 to the anti-roll unit 50, so that the anti-roll wheels 43 are synchronously compressed, the downward grip of the anti-roll wheels 43 is improved, the stability of the frame 20 is effectively increased, and the safety and comfort of the electric wheelchair when crossing obstacles are improved.

In addition, as shown in fig. 9, since the adjustable screw 71 of each strain unit 70 can be disposed on the power frame extension 413 away from or close to the frame linking portion 23, and the rubber block 72 is fixed on the adjustable screw 71 and abuts against the frame linking portion 23, the elastic coefficient of the rubber block 72 can be adjusted by rotating the adjustable screw 71 according to the requirement, so as to adjust the sensitivity of the power frame 41 transmitting the force to the frame 20, and adjust the stability and comfort of the electric wheelchair when crossing obstacles.

Next, as shown in fig. 6 and 7, the front suspension arm 31 has an upper convex portion 312 which is correspondingly abutted against the lower convex portion 26 of the frame 20, so as to prevent the front guide wheel 32 from contacting a plane when the electric wheelchair is in the plane. The present embodiment further includes an adjusting member 91, wherein the adjusting member 91 is disposed on the lower convex portion 26 in a vertically movable manner and has an adjusting end portion 911 for abutting against the upper convex portion 312. So as to adjust the height of the front guide wheel 32 from the plane and regulate the height of the electric wheelchair crossing the obstacle.

Example two:

as shown in fig. 10, an electric wheelchair having a front suspension arm and a power frame pivoted to each other and elastically linked with a frame according to an embodiment of the present invention is also composed of a frame 20, a front guide unit 30, a power unit 40, an anti-tilt unit 50, a first suspension unit 60, a strain unit, and a second suspension unit 80, and the second embodiment is different from the first embodiment in that:

front boom pivot portion 311 of front boom 31 is provided on front frame portion 21 coaxially with power frame pivot portion 411 of power frame 41. To shorten the length of the carriage 20 in the direction of travel to suit the needs of the user.

Example three:

as shown in fig. 11, a third embodiment of the present invention is different from the first embodiment in that an electric wheelchair having a front suspension arm and a power frame which are pivoted respectively and elastically linked with a frame is provided, and the electric wheelchair comprises:

Each strain unit 70 is a shock absorber with a compression spring, and one end 73 of each strain unit 70 is assembled on the power frame extension 413, and the other end 74 of each strain unit 70 is assembled on the frame linkage 23.

In summary, the above embodiments are merely preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalents, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. An electric wheelchair having a front suspension arm and a power frame each of which is pivoted and elastically interlocked with a frame, comprising:

a frame having a front frame portion, a rear frame portion and a frame linkage portion between the front and rear frame portions;

two front guide units respectively pivoted on two sides of the frame and respectively provided with a front cantilever and a front guide wheel which can be rotatably arranged on the front cantilever, wherein the front cantilever is provided with a front cantilever pivot part pivoted on the front frame part;

two power units which are respectively pivoted on two sides of the frame and are respectively provided with a power frame, a power source fixed on the power frame and a power wheel driven by the power source, wherein the power frame is provided with a power frame pivot part pivoted on the front frame part;

Two anti-tilting units respectively pivoted on the rear frame part;

the two first shock absorption units are respectively arranged between the front cantilever and the power frame;

two strain units respectively arranged between the power frame and the frame linkage part;

two second shock absorbing units respectively arranged between the frame linkage part and the anti-tilting unit;

therefore, the pivoting torque force generated by the front suspension arm is transmitted to the power frame by the first shock absorption unit, and the pivoting torque force generated by the power frame is transmitted to the frame by the strain unit.

2. The electric wheelchair as claimed in claim 1, wherein the front suspension arm pivot portion of each front suspension arm has a first pivot center, the power frame pivot portion of each power frame has a second pivot center, each power wheel has a rolling center, the rolling center is higher than the first and second pivot centers, and the connection point of the first suspension unit and the power frame is higher than the rolling center.

3. The electric wheelchair as claimed in claim 1, wherein the front suspension arm pivot portion of the front suspension arm and the power frame pivot portion of the power frame are provided on the front frame portion coaxially or non-coaxially.

4. The electric wheelchair as claimed in claim 1, wherein each power frame further comprises a power frame fixing portion and a power frame extending portion connected to the power frame fixing portion, each power source is fixed to the power frame fixing portion, and each first suspension unit is disposed between the front suspension arm and the power frame extending portion; each strain unit is respectively arranged between the power frame extension part and the frame linkage part.

5. The electric wheelchair as claimed in claim 1, wherein each of the strain units is a rubber block.

6. The electric wheelchair as claimed in claim 1, wherein each of the strain units comprises an adjustable screw and a rubber block fixed to the adjustable screw, the adjustable screw is disposed on the power frame in a direction away from or close to the linkage portion of the frame, and the rubber block is fixed to the adjustable screw and abuts against the linkage portion of the frame.

7. The electric wheelchair as claimed in claim 1, wherein each of the first and second suspension units and the strain unit is a shock absorber.

8. The electric wheelchair as claimed in claim 1, wherein each anti-tipping unit comprises a rear suspension arm and an anti-tipping wheel rotatably mounted on the rear suspension arm, the rear suspension arm has a rear suspension arm pivot portion pivotally mounted on the rear frame portion, and each second shock absorbing unit is mounted between the frame linkage portion and the rear suspension arm pivot portion.

9. The electric wheelchair as claimed in claim 1, wherein the frame further has two lower protrusions provided on both sides of the front frame portion, and the two front cantilevers further have upper protrusions abutting against the lower protrusions.

10. The electric wheelchair as claimed in claim 9, further comprising an adjusting member which is provided in the lower protrusion to be able to be lifted and lowered and has an adjusting end portion for supporting the upper protrusion.