Knob type shift lever driving device suitable for wheelchair and wheelchair

Abstract

A knob-type shift lever drive device suitable for a wheelchair and a wheelchair, comprising a ratchet drive mechanism for driving the wheelchair and a knob-type control lever cooperating with the ratchet drive mechanism to switch between the front gear and the rear gear, wherein the knob-type control lever is mounted on the wheelchair wheel through the ratchet drive mechanism; the ratchet drive mechanism comprises a base plate and a ratchet fixedly connected to the wheelchair wheel, a fixed shaft colinear with the axis of the wheelchair wheel is mounted on the base plate through a fixed bearing, and the ratchet is mounted on the fixed shaft through a rolling bearing. The present invention uses the lever principle to convert the horizontal thrust of the arm into a ratchet rotation force through the lever by arranging a knob control lever and a ratchet drive mechanism, so that the drive is convenient, labor-saving and efficient; the driving direction of the core rod can be switched by the knob, thereby changing the force direction of the ratchet, which is convenient for controlling the travel direction of the wheelchair, and the knob can be automatically reset by an elastic reset element, so that the structure is simple and easy to use.

Description

Technical Field

[0001] The present invention relates to the technical field of wheelchair equipment, in particular to a knob-type shift lever driving device suitable for a wheelchair. The present invention also relates to a horizontal push lever driven wheelchair. Background Art

[0002] A wheelchair is a commonly used nursing device and is widely used in the fields of medical care and elderly care. Wheelchairs in the prior art include manually driven wheelchairs and electrically driven wheelchairs. Since electrically driven wheelchairs are too expensive and difficult for patients to afford, manually driven wheelchairs are mostly used in the market. Manually driven wheelchairs are mostly equipped with hand wheels on the wheels of the wheelchair. When in use, the patient needs to use his arms to push the hand wheels to drive the wheelchair forward or backward. Usually, the arms need to exert a greater force to drive the wheelchair. If patients use their arms to drive the wheelchair for a long time, it will cause strain and injury to the user's muscles around the shoulder, waist and chest, thereby causing diseases such as periarthritis of the shoulder, cervical spondylosis, and lumbar disc herniation. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a knob-type shift lever driving device suitable for a wheelchair with simple structure, high transmission efficiency and labor saving in view of the deficiencies in the prior art.

[0004] Another technical problem to be solved by the present invention is to provide a horizontal push lever driven wheelchair using the aforementioned knob type shift lever driving device.

[0005] The technical problem to be solved by the present invention is achieved through the following technical solution: a knob-type shift lever driving device suitable for a wheelchair, which is characterized in that it includes a ratchet drive mechanism for driving the wheelchair and a knob-type control lever cooperating with the ratchet drive mechanism to realize the switching between the front gear and the rear gear, the knob-type control lever is installed on the wheelchair wheel through the ratchet drive mechanism, and a brake device is installed on the knob-type control lever;

[0006] The ratchet drive mechanism comprises a base plate and a ratchet fixedly connected to the wheelchair wheel, a fixed shaft colinear with the axis of the wheelchair wheel is mounted on the base plate through a fixed bearing, and the ratchet is mounted on the fixed shaft through a rolling bearing;

[0007] The knob-type control lever comprises an outer tube, a middle tube and a core rod. The middle tube is fixed inside the outer tube. The outer tube is fixed on the base plate through a steel tube bracket. An anti-slip sleeve is installed on the outer tube. The core rod consists of an upper and lower rod bodies that are slidably plugged in. A knob for rotating the core rod to realize the switching between the front gear and the rear gear is installed on the top of the upper rod body. A knob seat is installed on the top of the middle tube. A buffer spring is sleeved at the joint between the upper rod body and the lower rod body. An elastic reset element for automatically resetting the core rod is installed between the part of the lower rod body that extends out of the outer tube and the base plate. A driving end that is stuck in the ratchet tooth groove is provided at the bottom end of the lower rod body. A vertically arranged driving surface is provided on the front side of the driving end, and an inclined sliding surface is provided on the rear side of the driving end.

[0008] The technical problem to be solved by the present invention can also be achieved by the following technical solution: the ratchet is fixedly connected to the wheelchair wheel through a wheel connecting mechanism, the wheel connecting mechanism includes a wheel connecting seat and a connecting plate fixedly connected to the wheel connecting seat, the wheel connecting seat is fixedly connected to the ratchet through bolts, and the connecting plate is fixedly connected to the wheelchair wheel through bolts.

[0009] The technical problem to be solved by the present invention can also be achieved by the following technical solution: the connecting piece is provided with three pieces, which are evenly distributed along the circumference of the wheel connecting seat.

[0010] The technical problem to be solved by the present invention can also be achieved by the following technical solution: the bottom end of the upper rod body is provided with a plug-in portion, and the top end of the lower rod body is provided with a plug-in groove that cooperates with the plug-in portion of the upper rod body.

[0011] The technical problem to be solved by the present invention can also be achieved through the following technical scheme, wherein the plug-in part is a plug-in rod, the top end of the plug-in rod is fixedly connected to the upper rod body through a horizontal pin, a sliding pin is fixed to the bottom end of the plug-in rod, and a vertical long hole is opened on the groove wall of the plug-in groove of the lower rod body for the sliding pin to slide up and down, and the buffer spring is sleeved on the plug-in rod.

[0012] The technical problem to be solved by the present invention can also be achieved by the following technical solution: an upper limit plate is provided on the lower rod body above the elastic reset element, and a lower limit plate cooperating with the upper limit plate is provided on the base plate below the elastic reset element.

[0013] The technical problem to be solved by the present invention can also be achieved through the following technical scheme. The brake device includes a brake wheel fixedly connected to the ratchet, a brake pad matched with the brake wheel, and a brake handle installed on the outer tube of the knob-type control rod. The brake handle is connected to the brake pad through a brake line.

[0014] Another technical problem to be solved by the present invention is achieved through the following technical solution: a horizontal push lever-driven wheelchair, which is characterized in that it includes a wheelchair body, and the above-mentioned knob-type shift lever driving device is symmetrically installed on both sides of the wheelchair body.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] (1) The present invention provides a knob control rod and a ratchet drive mechanism, and utilizes the lever principle to convert the horizontal thrust of the arm into the rotational force of the ratchet, which is convenient to drive, labor-saving and efficient. The direction of the driving force of the knob control rod can be switched by turning the knob on the knob control rod, thereby changing the force direction of the ratchet, making it easier to control the direction of travel of the wheelchair. The knob can be automatically reset by an elastic reset element, and the structure is simple and easy to use.

[0017] (2) The wheelchair described in the present invention uses the lever principle to drive the wheelchair forward or backward through the knob-type shift lever driving devices on both sides, and can also change the speed of the wheelchair wheels on both sides through the knob-type shift lever driving devices, thereby achieving turning through the speed difference. It has the advantages of flexible steering, easy use, labor saving and high efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic diagram of the structure of the wheelchair of the present invention;

[0019] Figure 2 It is a structural schematic diagram of the knob type shift lever driving device of the present invention;

[0020] Figure 3 yes Figure 2 An exploded view of the knob-type shift lever driving device;

[0021] Figure 4 It is a schematic diagram of the structure of the knob control lever;

[0022] Figure 5 It is a structural schematic diagram of the lower rod body;

[0023] Figure 6 is a schematic diagram of the structure of the ratchet drive mechanism;

[0024] Figure 7 is a structural schematic diagram of the wheel connection mechanism;

[0025] Figure 8 yes Figure 7 An exploded view of the wheel connection mechanism;

[0026] Fig. 9 It is the state diagram of the ratchet drive mechanism when the wheelchair is moving forward;

[0027] Fig.10 It is the state diagram of the ratchet drive mechanism when the wheelchair moves backward;

[0028] Fig.11 It is a schematic diagram of the structure of the brake device;

[0029] Fig.12 It is a state diagram when the present invention is changed into a normally closed self-locking device. DETAILED DESCRIPTION

[0030] The specific technical solutions of the present invention are further described below with reference to the accompanying drawings, so as to facilitate further understanding of the present invention by those skilled in the art, and do not constitute a limitation on the rights thereof.

[0031] Example 1, reference Figure 1-8 A knob-type shift lever driving device suitable for a wheelchair comprises a ratchet drive mechanism 3 for driving the wheelchair and a knob-type control lever 2 for cooperating with the ratchet drive mechanism 3 to realize switching between the front gear and the rear gear. The knob-type control lever 2 is mounted on the wheelchair wheel through the ratchet drive mechanism 3, and a brake device is installed on the knob-type control lever 2;

[0032] The ratchet drive mechanism comprises a base plate 23 and a ratchet 27 fixedly connected to the wheelchair wheel, a fixed shaft 30 colinear with the axis of the wheelchair wheel is mounted on the base plate 23 via a fixed bearing 25, and the ratchet 27 is mounted on the fixed shaft 30 via a rolling bearing 31;

[0033] The knob-type control lever 2 comprises an outer tube 12, a middle tube 13 and a core rod. The outer tube 12 is provided with an anti-slip sleeve 11. The middle tube 13 is fixed inside the outer tube 12. The outer tube 12 is fixed to the base plate 23 through a steel tube bracket 24. A threaded hole is opened on the outer tube 12. The middle tube 13 is fixed by screws. A plane matching the screws is milled on the outer wall of the middle tube 13. The middle tube 13 of the present invention guides the core rod. The core rod is composed of an upper and a lower rod body that are slidably plugged. The top of the upper rod body 5 is The end is provided with a knob 14 for rotating the core rod to realize the switching between the front gear and the rear gear, the top end of the middle tube 13 is provided with a knob seat 15, the joint between the upper rod body 5 and the lower rod body 9 is sleeved with a buffer spring 18, and an elastic reset element 10 for automatically resetting the core rod is installed between the part of the lower rod body 9 extending out of the outer tube and the base plate 23, and the bottom end of the lower rod body 9 is provided with a driving end stuck in the tooth groove of the ratchet 27, the front side of the driving end is provided with a vertically arranged driving surface 20, and the rear side of the driving end is provided with an inclined sliding surface 21;

[0034] Reference Fig.12 The elastic reset element 10 is a reset spring. By changing the compression state of the reset spring, the device of the present invention is transformed into a normally closed self-locking device, that is, the reset spring always presses the lower rod of the core rod so that it is always inserted into the tooth groove of the ratchet / gear. It will only be separated under the action of external force. At this time, it will not self-lock. This structure can be used in self-locking wheelchairs (the patient can only be pushed by other people), self-locking sit-stand transfer machines and other similar scenarios that require self-locking;

[0035] Reference Fig. 9When moving forward, the driving surface of the driving end of the knob control rod is set forward, and the finger presses the knob 14 down. At this time, the driving end of the knob control rod is stuck in the tooth groove of the ratchet 27, and the knob control rod 2 is pushed forward to drive the ratchet 27 to rotate. At the same time, the wheelchair wheels and the ratchet 27 are synchronously rotated forward through the wheel connection mechanism 4, thereby driving the entire wheelchair forward. At this time, both hands continue to push forward. When the arms are pushed forward to the maximum extent, the thumbs are released. Under the action of the elastic reset element 10, the core rod is separated from the ratchet 27, the core rod is reset, the arms are retracted, the knob control rod 2 is reset, and then the above actions are repeated to move forward;

[0036] Reference Fig.10 When shifting gears, rotate the knob in the forward state by 180°, and set the driving surface of the driving end of the knob control rod backward, that is, it changes to the reverse gear. At this time, hold the anti-slip cover 11, first straighten the arm to push the knob control rod 2 to the front, and press the knob 14 with your finger. At this time, the driving end of the knob control rod 2 is stuck in the tooth groove of the ratchet 27, and the arm is retracted to drive the entire wheelchair backward. When the arm is retracted to the point where it can no longer bend, release the finger, reset the core rod again, and repeat the above action to perform the reverse operation;

[0037] In neutral position, if the finger does not press the knob, it is in neutral position. At this time, others can push the wheelchair from behind to move it;

[0038] When braking, just hold the brake handle tightly to brake.

[0039] Example 2, reference Figure 7 and 8 , the knob-type shift lever drive device suitable for a wheelchair described in Example 1, the ratchet 27 is fixedly connected to the wheelchair wheel through the wheel connecting mechanism 4, the wheel connecting mechanism 4 includes a wheel connecting seat 34 and a connecting plate 35 fixedly connected to the wheel connecting seat 34, the wheel connecting seat 34 is fixedly connected to the ratchet 27 through bolts 36, and the connecting plate 35 is fixedly connected to the wheelchair wheel through bolts 36. The connecting plates are preferably provided in three pieces, and the three connecting plates are evenly distributed along the circumference of the wheel connecting seat. One piece, two pieces or more pieces may also be provided. If two pieces are provided, they are symmetrically arranged along the center of the wheel connecting seat. The number of connecting plates is determined according to the shape of the wheel spokes.

[0040] Embodiment 3, the knob-type shift lever drive device suitable for a wheelchair as described in Embodiment 1, wherein the brake device comprises a brake wheel 26 fixedly connected to a ratchet wheel 27, a brake pad 29 cooperating with the brake wheel 26, and a brake handle 6 mounted on an outer tube 12 of a knob-type control lever 2, wherein the brake handle 26 is connected to the brake pad 29 via a brake line 7.

[0041] Embodiment 4, the knob-type shift lever driving device suitable for a wheelchair described in Embodiment 1, wherein the bottom end of the upper rod body 5 is provided with a plug-in portion, the top end of the lower rod body 9 is provided with a plug-in slot 19 that cooperates with the plug-in portion of the upper rod body 5, the plug-in portion is a plug-in rod 8, the top end of the plug-in rod 8 is fixedly connected to the upper rod body 5 through a horizontal pin 37, a sliding pin is fixed to the bottom end of the plug-in rod 8, a vertical long hole for the sliding pin to slide up and down is opened on the groove wall of the plug-in slot 19 of the lower rod body 9, and the buffer spring 18 is sleeved on the plug-in rod 8;

[0042] When the wheelchair wheel continues to move forward under the action of inertia, if the hand fails to release the knob in time, the sliding surface 21 of the driving end of the knob control rod will slide with the tooth groove of the ratchet 27, so that the core rod of the knob control rod 2 is pushed upward, and the buffer spring 18 between the upper and lower rod bodies of the core rod is compressed, and the core rod and the ratchet 27 are forced to separate, thereby avoiding damage to the knob-type shift lever driving device described in the present invention during inertial movement and improving the safety of the device.

[0043] Embodiment 5, the knob-type shift lever drive device suitable for a wheelchair as described in Embodiment 1, is provided with an upper limit plate 22 on the lower rod body 9 above the elastic reset element 10, and is provided with a lower limit plate 32 on the base plate 23 below the elastic reset element 10 for cooperating with the upper limit plate to limit the elastic reset element, the lower limit plate 32 adopts a right-angle bracket, the driving end of the lower rod body 9 passes through the lower limit plate 32 and cooperates with the ratchet 27 below the lower limit plate 32, wherein the positions of the upper limit plate and the lower limit plate can be set according to the situation, for example, the lower limit plate can be set on the lower rod body, and the upper limit plate can be set on the base plate.

[0044] Embodiment 6, a horizontal push type lever driven wheelchair, comprises a wheelchair body 1, on both sides of which the knob type shift lever driving devices described in embodiments 1-5 are symmetrically mounted.

[0045] The present invention provides a knob control rod 2 and a ratchet drive mechanism 3, and utilizes the lever principle to convert the horizontal thrust of the arm into the rotational force of the ratchet 27, so that the driving is convenient, labor-saving and efficient; the direction of the driving force of the knob control rod can be switched by turning the knob on the knob control rod, thereby changing the force direction of the ratchet, making it easy to control the travel direction of the wheelchair; and the knob and the core rod can be automatically reset by the elastic reset element, so the structure is simple and easy to use.

Claims

1. A knob-type shift lever driving device suitable for a wheelchair, characterized in that: It includes a ratchet drive mechanism for driving a wheelchair and a knob-type control lever that cooperates with the ratchet drive mechanism to realize switching between the front gear and the rear gear, the knob-type control lever is installed on the wheelchair wheel through the ratchet drive mechanism, and a brake device is installed on the knob-type control lever; The ratchet drive mechanism comprises a base plate and a ratchet fixedly connected to the wheelchair wheel, a fixed shaft colinear with the axis of the wheelchair wheel is mounted on the base plate through a fixed bearing, and the ratchet is mounted on the fixed shaft through a rolling bearing; The knob-type control lever comprises an outer tube, a middle tube and a core rod, the middle tube is fixed inside the outer tube, the outer tube is fixed on the base plate through a steel tube bracket, the core rod is composed of an upper and lower rod body that are slidably plugged, the top of the upper rod body is equipped with a knob for rotating the core rod to realize the front gear and rear gear conversion, the top of the middle tube is equipped with a knob seat, a buffer spring is sleeved at the plug-in place of the upper rod body and the lower rod body, an elastic reset element for automatically resetting the core rod is installed between the part of the lower rod body extending out of the outer tube and the base plate, and the bottom end of the lower rod body is provided with a driving end stuck in the ratchet tooth groove; The ratchet is fixedly connected to the wheelchair wheel via a wheel connection mechanism, wherein the wheel connection mechanism comprises a wheel connection seat and a connection plate fixedly connected to the wheel connection seat, the wheel connection seat is fixedly connected to the ratchet via bolts, and the connection plate is fixedly connected to the wheelchair wheel via bolts; A vertically arranged driving surface is provided at the front side of the driving end of the lower rod body, and an inclinedly arranged sliding surface is provided at the rear side of the driving end.

2. The knob-type shift lever driving device suitable for a wheelchair according to claim 1, characterized in that: The connecting pieces are provided with three pieces and are evenly distributed along the circumference of the wheel connecting seat.

3. The knob-type shift lever driving device suitable for a wheelchair according to claim 1, characterized in that: The bottom end of the upper rod body is provided with an inserting portion, and the top end of the lower rod body is provided with an inserting groove matched with the inserting portion of the upper rod body.

4. The knob-type shift lever driving device suitable for a wheelchair according to claim 3, characterized in that: The plug-in part is a plug-in rod, the top of which is fixedly connected to the upper rod body through a horizontal pin, the bottom of which is fixed with a sliding pin, and the groove wall of the lower rod body plug-in groove is provided with a vertical long hole for the sliding pin to slide up and down, and the buffer spring is sleeved on the plug-in rod.

5. The knob-type shift lever driving device suitable for a wheelchair according to claim 1, characterized in that: An upper limit plate is arranged on the lower rod body above the elastic reset element, and a lower limit plate is arranged on the base plate below the elastic reset element.

6. The knob-type shift lever driving device suitable for a wheelchair according to claim 1, characterized in that: The brake device comprises a brake wheel fixedly connected to the ratchet, a brake pad matched with the brake wheel, and a brake handle installed on the outer tube of the knob-type control rod, and the brake handle is connected to the brake pad through a brake line.

7. The knob-type shift lever driving device suitable for a wheelchair according to claim 1, characterized in that: An anti-slip sleeve is installed on the outer tube.

8. A wheelchair, characterized in that: The invention comprises a wheelchair body, on both sides of which the knob-type shift lever driving device according to any one of claims 1 to 7 is symmetrically mounted.

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