DE202016104690U1 - A manual stairs rising wheelchair - Google Patents

Abstract

A manual stair climbing wheelchair comprising: a seat (1), front wheels (2a) and rear wheels (2b); Seat restraints (3) connected to the seat (1) and used to return the seat (1); a transmission (4) comprising gear wheels (8); a hand crank (5) which is mechanically connected to the transmission (4); a driven gear set (6) comprising driven gears (12) and a recess (13), the set of gears (6) being connected to the front wheels (2a) and the rear wheels (2b); wherein the recess (13) is disposed between two of the driven gears (12), wherein, when the seat (1) of the wheelchair is reclined by means of the seat reclining devices (3), the gears (8) of the transmission (4) are in the Recess (13) of the set (6) driven gears and engage the driven gears (12), so that the front wheels (2a) and the rear wheels (2b) are driven by the transmission (4).

Description

Technical area

The present utility model relates to a wheelchair, in particular a manual stair climbing wheelchair.

Background of the invention

Due to the gradual aging of societies in many countries and regions, most older people need a wheelchair as a daily means of transport, but stairs are often an obstacle for people in wheelchairs, so to circumvent such obstacles they usually have to go far to avoid it To reach the goal, or worse, if there is no other access, the wheelchair must be moved manually, for example up and down the stairs with the help of several other people.

An electric wheelchair may be able to solve the above-mentioned problem of moving up and down the stairs, but such a wheelchair is expensive and has a complicated structure, and many people can not afford it. In addition, safety is a big problem when an electric wheelchair moves up and down stairs.

A Chinese utility model (publication number CN2580934Y ) discloses a wheelchair-accessible and self-propelled wheelchair equipped with left and right plastic wheels and a multi-directional guide wheel for traveling on a horizontal plane and for raising a small pitch, and also provided with four cross wheels for climbing stairs. When such a wheelchair is used to step up stairs, a pull rod must be pulled, with the right and left plastic wheels and the multi-directional guide wheel raised respectively by a connecting rod and by leverage, while the seat of the wheelchair is placed in a reclined position. At this time, the four cross wheels come into contact with the tread of the steps, and the pull rod must be pushed down to transmit the driving force to the longitudinal shaft, whereby a larger driving force can be exerted on worm gear to reduce the speed to a simultaneous To cause rotation of the four cross wheels for the purpose of ascending or descending the steps. However, due to different lengths and widths in the treads of the steps, the cross wheels tend to slip over the edges of the steps, posing a safety problem. In addition, the structure of a cross wheel is relatively complicated, so that the production costs are relatively high.

Summary of the invention

An object of the present invention is to provide a wheelchair for stepping manually, which allows a person driving the wheelchair to safely move it up and down the stairs with limited effort.

According to one embodiment of the present invention, there is provided a manual stair climbing wheelchair comprising: a seat, front and rear wheels, seat restraints connected to the seat and used to reset it, a gear including gears; Hand crank, which is mechanically connected to the transmission, a driven gear set with driven sprockets and a recess, wherein the gear set of the driven sprocket is connected to the front wheels and the rear wheels and the recess is located between two of the driven sprockets, wherein when the seat the wheelchair is reset by means of the seat restoring devices, the gears of the transmission are arranged in the recess of the driven sprocket wheel set and engage in the driven sprockets, so that the front and rear wheels are driven by the gear w earth.

Preferably, the transmission further comprises a drive gear connected to the hand crank via a chain. The hand crank also includes a crank gear, and the crank gear is connected to the chain.

Preferably, the transmission ratio of the transmission is 1:30 to 1:40.

Preferably, after adjustment of the seat restoring devices, the seat is recessed at an angle of 35-45 degrees relative to the horizontal plane.

Preferably, each of the seat restraints includes a clutch handle, a tooth plate, a tooth plate positioning plate, and clutch teeth. The clutch handle is located under the wheelchair handles.

In the present utility model, the front and rear wheels can be driven by the transmission ratio of the transmission. After the transmission has been shifted, the front and rear wheels are locked and can not be moved by hand or powered by a self-propelled but they can only be driven by hand by turning the hand crank, so that a self-slippage of the wheelchair can be avoided when he moves up and down the stairs, and therefore he is very safe. This is because a greater torque can be generated after the transmission is connected to the front and rear wheels, whereby the person driving the wheelchair can drive up and down the steps with very little effort. In addition, the person driving the wheelchair can reset its seat simply by using the reset devices so that the wheelchair can move up and down the stairs by turning the hand crank. As such, the wheelchair is easy to use. The wheelchair for manual stair climbing according to the present utility model is also simple in structure and has a low manufacturing cost.

Brief description of the drawings

With reference to the accompanying drawings, the present utility model will be better understood by those skilled in the art and the advantages of the present utility model will become more apparent. The accompanying drawings, which are described herein, are merely illustrative of the selected embodiments and not all possible embodiments and are not intended to limit the scope of the present invention.

1A Fig. 13 is the left view of the manual stair climbing wheelchair operated on a horizontal plane according to an embodiment of the present invention;

1B Fig. 11 is the rear view of the manual stair climbing chair according to an embodiment of the present invention;

1C Fig. 11 is the left view of the manual stair climbing wheelchair moving up and down stairs, according to an embodiment of the present invention;

2 Fig. 12 is a schematic representation of the manual stair climbing wheelchair moving down the steps, according to one embodiment of the present invention;

3A Fig. 11 is the right side view of the transmission according to an embodiment of the present invention;

3B Fig. 12 is a plan view of the transmission according to an embodiment of the present invention;

3C Fig. 10 is the exploded view of the transmission according to an embodiment of the present invention;

4A Fig. 13 is the left side view of the hand crank and the transmission according to an embodiment of the present invention;

4B Fig. 11 is the rear view of the hand crank and the transmission according to an embodiment of the present invention;

5A Fig. 13 is a front view of one of the seat restraints according to an embodiment of the present invention;

5B Fig. 14 is the left-side view of the seat restoring device according to an embodiment of the present invention;

5C Fig. 13 is an exploded view of the seat restraint according to an embodiment of the present invention; and

6 Fig. 13 is the perspective view of the manual stair climbing chair according to an embodiment of the present invention.

Detailed Description of the Preferred Embodiments

As in 1A and 1B shown, the wheelchair closes ( 100 ) for manual stair climbing a seat ( 1 ), two front wheels ( 2a ), two rear wheels ( 2 B ), two seat reset devices ( 3 ), a transmission ( 4 ), a hand crank ( 5 ) and two sentences ( 6 ) driven gears. As in 10 shown, are the two front wheels ( 2a ) on the left or the right side of the seat ( 1 ) and the two rear wheels ( 2 B ) are also on the left and the right side of the seat ( 1 ) arranged. The two seat reset devices ( 3 ) are on the left or right side of the seat ( 1 ) and with the seat ( 1 ) and the wheelchair handle ( 7 ) connected to the seat ( 1 ) reset. The gear ( 4 ) is at the bottom of the seat ( 1 ) and includes two gears ( 8th ) and a drive gear ( 9 ) one. The two gears ( 8th ) are on the left and right side of the transmission housing ( 10 ), and the drive gear ( 9 ) is behind the gearbox ( 10 ) arranged. The hand crank ( 5 ) is behind the seat ( 1 ) and with the drive gear ( 9 ) via a chain ( 11 ) connected. The sentences ( 6 ) driven gears consist of a plurality of driven gears ( 12 ), which are connected together and on the left and right side of the seat ( 1 ) are arranged. The sentences ( 6 ) driven gears are with the front wheels ( 2a ) and rear wheels ( 2 B ) connected, around the front wheels ( 2a ) or rear wheels ( 2 B ) to drive. As in the enlarged view in 1A shown, the left-hand sentence ( 6 ) driven gears further a recess ( 13 ) between two of the driven gears ( 12 ) is arranged.

When the wheelchair ( 100 ) Must go up and down stairs, the seat ( 1 ) by means of the seat restoring devices ( 3 ) are reset. As in 10 are shown, when the seat ( 1 ), the gears ( 8th ) of the transmission ( 4 ) accordingly in the depression ( 13 ) of sentences ( 6 ) driven gears and engage in the driven gears ( 12 ) (as in the enlarged view in FIG 1C shown) so that the front wheels ( 2a ) and the rear wheels ( 2 B ) from the gearbox ( 4 ) are driven. This will cause the front wheels ( 2a ) and the rear wheels ( 2 B ), which can not be pushed or powered by hand self-propelled, but can only be driven by hand by turning the hand crank ( 5 ) to increase the torque and the front wheels ( 2a ) and the rear wheels ( 2 B ) to drive up and down the stairs.

2 Figure 3 is a schematic representation of the manual stair climbing wheelchair moving down the steps according to an embodiment of the present invention. In this example, the person sitting in the wheelchair does not lean forward because the seat is returned from the seat restraints of this utility model.

In the present utility model, the four front and rear wheels can be driven by the gear ratio of the transmission. After the transmission is switched, the four wheels are locked and can not be moved by hand or driven by themselves, but they can only be driven by hand by turning the hand crank, so that a self-slippage of the wheelchair can be avoided when he steps up moving up and down, and it's very safe.

Preferably, after adjustment of the seat restraints, the seat reclines backward at an angle of 35-45 degrees relative to the horizontal plane, so that the center of gravity of the person sitting on the wheelchair is prevented from shifting forward when the wheelchair moves down the steps.

Preferably, the hand crank is located behind the seat to allow the person driving the wheelchair to rotate the hand crank to move the wheelchair up and down the stairs.

Preferably, the transmission ratio of the transmission is 1:30 to 1:40 to increase the torque transmitted from the transmission to the front and rear wheels while allowing high speed in the ascent and descent of the steps.

Preferably, the front and rear wheels include non-slip tires.

According to an embodiment of the present utility model, as in 3A and 3B shown, the gearbox closes ( 4 ) two gears ( 8th ) and the drive gear ( 9 ) one. The two gears ( 8th ) are on the left and right side of the transmission housing ( 10 ), and the drive gear ( 9 ) is behind the gearbox ( 10 ) arranged. As in 3C illustrated, the transmission comprises ( 4 ) a snail ( 14 ) and a worm gear set ( 15 ). The snail ( 14 ), the drive gear ( 9 ) and the worm gear set ( 15 ) are connected together, and the worm gear set ( 15 ) is with the two gears ( 8th ) connected. Therefore, the two gears ( 8th ) is also driven when the drive gear ( 9 ) is driven. An advantage of the structure is that the transmission can be strengthened to prevent self-slippage of the wheelchair due to slippage of the front and rear wheels during ascent and descent of the steps, as is the case with the conventional wheelchair. In addition, the torque of the transmission can be increased.

According to an embodiment of the present utility model, as in 4A and 4B illustrated, the hand crank closes ( 5 ) continue a crank drive. The crank drive is connected to the drive gear ( 9 ) through the chain ( 11 ) connected. When the hand crank ( 5 ), the driving force can be transmitted to the drive gear to drive the transmission.

According to an embodiment of the present utility model, as in 5A and 5B illustrated, each of the seat restraints (FIG. 3 ) a clutch handle ( 16 ), a tooth plate ( 17 ), a positioning plate ( 18 ) for the tooth plate and clutch teeth ( 19 ). The clutch handle ( 16 ) is with the coupling teeth ( 19 ) connected; the positioning plate for the tooth plate ( 18 ) is with the wheelchair handle ( 7 ), and the tooth plate ( 17 ) is on the positioning plate ( 18 ) attached to the tooth plate. The positioning plate ( 18 ) for the tooth plate includes a groove ( 20 ), the clutch teeth ( 19 ) close a lead ( 21 ), which is in the groove ( 20 ) of the positioning plate ( 18 ) can be hidden for the tooth plate and with the seat ( 1 ) connected is. The clutch handle ( 16 ) can be placed under the wheelchair handle. If the Clutch handle ( 16 ) is pressed down, the clutch teeth ( 19 ) along the teeth of the tooth plate ( 17 ) to adjust the inclination of the seat. The advantage is that a large number of slight movements of the clutch teeth ( 19 ) along the teeth of the tooth plate ( 17 ) the person who drives the wheelchair the inclination of the seat ( 1 ) can still easily adapt despite the heavy load that is exerted by the person sitting in the wheelchair.

6 Fig. 13 is the perspective view of the manual stair climbing chair according to an embodiment of the present invention. With the help of this perspective view, the depression ( 13 ) of the sentence ( 6 ) driven gears the position of the driven gears ( 12 ) and their connection relationship are visualized.

Although the present invention has been illustrated and described in drawings, embodiments and / or examples, it should be understood that those skilled in the art may make changes to the embodiments without departing from the principles and spirit of the utility model; Therefore, the scope of the present invention should be limited only by the appended claims and their equivalents.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• CN 2580934 Y [0004]

Claims (11)

A manual stair climbing wheelchair comprising: a seat ( 1 ), Front wheels ( 2a ) and rear wheels ( 2 B ); Seat reset devices ( 3 ), with the seat ( 1 ) and are used to secure the seat ( 1 ) reset; a gearbox ( 4 ) the gears ( 8th ); a hand crank ( 5 ) mechanically with the gearbox ( 4 ) connected is; a set ( 6 ) driven gears, the driven gears ( 12 ) and a recess ( 13 ), the sentence ( 6 ) driven gears with the front wheels ( 2a ) and the rear wheels ( 2 B ) connected is; the depression ( 13 ) between two of the driven gears ( 12 ), wherein when the seat ( 1 ) of the wheelchair by means of the seat reclining devices ( 3 ), the gears ( 8th ) of the transmission ( 4 ) in the depression ( 13 ) of the sentence ( 6 ) driven gears and in the driven gears ( 12 ), so that the front wheels ( 2a ) and the rear wheels ( 2 B ) of the transmission ( 4 ) are driven. The wheelchair according to claim 1, wherein the transmission ( 4 ) a drive gear ( 9 ), wherein the drive gear ( 9 ) with the hand crank ( 5 ) via a chain ( 11 ) connected is. The wheelchair according to claim 2, wherein the hand crank ( 5 ) comprises a crank drive wheel, wherein the crank drive wheel with the chain ( 11 ) connected is. The wheelchair according to claim 1, wherein the transmission ratio of the transmission ( 4 ) Is 1:30 to 1:40. The wheelchair according to claim 1, wherein the transmission ( 4 ) a worm gear set ( 15 ) and a snail ( 14 ). The wheelchair according to claim 1, wherein the transmission ( 4 ) at the bottom of the seat ( 1 ) is arranged. The wheelchair according to claim 1, wherein after adjustment of the seat reclining devices ( 3 ) the seat ( 1 ) is inclined at an angle of 35-45 degrees relative to the horizontal plane. The wheelchair according to claim 1, wherein two of the seat reclining devices ( 3 ) on the left or right side of the seat ( 1 ) are arranged. The wheelchair according to claim 1, wherein each of the seat reclining devices ( 3 ) a clutch handle ( 16 ), a tooth plate ( 17 ), a positioning plate ( 18 ) for the tooth plate and clutch teeth ( 19 ). The wheelchair according to claim 9, wherein the clutch handle ( 16 ) is arranged under the wheelchair handle. The wheelchair according to claim 1, wherein the front wheels ( 2a ) and the rear wheels ( 2 B ) include non-slip tires.

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