CN114404157A - A kind of swing movement wheelchair and operation method - Google Patents

Abstract

The invention discloses a pendulum motion wheelchair, comprising a wheelchair main body composed of a wheelchair seat frame, two wheels, a central shaft and a universal wheel; it is characterized in that a gear box is respectively installed on the inner side of the two wheels, the gear box is There is a fixed axis gear train in the box; it also includes a rowing handle mechanism and a braking mechanism; a person sits in a wheelchair and holds the rowing handle on both sides with both hands, just like rowing a boat to drive the gear box body to rotate an angle around the central axis , under the action of the fixed-axis gear train, the wheel is driven forward; when the handle returns, the pawl is released from the tooth slot and the handle returns to its original position with no load. Under the action of inertia, the wheelchair will continue to move forward; therefore, there is no need to hold it hard Hold the rim of the wheel and do not need to let go and change the position of the hand back and forth, the operation is convenient to move, and the opponent will not cause damage.

Description

A kind of pendulum sports wheelchair and operation method

technical field

The present invention relates to means of transportation, in particular to a wheelchair.

Background technique

There are various types of wheelchairs at present, including electric type and manual type. The technology related to the present invention is a manual type wheelchair. Manual wheelchairs are generally used by people with lower limb disabilities or reduced mobility. When exercising, in addition to other people's help to push, mainly rely on the pedestrians to turn the wheels with their own hands to move forward. For example, the wheelchair used for competition in the Paralympic Games uses the turning of two wheels as the source of power. This kind of wheelchair, which is powered by rotating wheels, needs to firmly hold the wheel rim and turn it forward, and constantly release the hand to change the position of the hand, which is very inconvenient, and the opponent will cause damage. This deficiency is caused by its structural design concept, and it is very necessary to improve it and change the operation mode of the hand-held wheel rim rotation.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome the deficiencies of the existing manual wheelchair's hand-held wheel rim rotation operation mode, and to propose a swing movement wheelchair and an operation method of the wheelchair.

A wheelchair with pendulum movement, comprising a wheelchair main body consisting of a wheelchair seat frame, two wheels, a central shaft, and a universal wheel; it is characterized in that a gear box is respectively installed on the inner side of the two wheels, and a gear box is arranged in the gear box. There is a fixed-axis gear train; the above-mentioned fixed-axis gear train is composed of a gear box, a planetary gear carrier, a central gear, three planetary gears, an inner gear, an outer ratchet, and a gear box cover; the specific installation structure of the fixed-axis gear train is: In the gear box, the planetary gear carrier is fixed on the central shaft by keys, the central gear is movably mounted on the central shaft through the bearing, the three planetary gears are evenly installed on the planetary gear carrier through the planetary gear shaft, and the outer side of the three planetary gears are floating with The outer ratchet of the inner gear sleeved on it meshes, the inner side of the three planetary gears meshes with the central gear, the shaft hole of the gear box is supported on the outer hub protruding from the central gear through the bearing, and the shaft hole of the gear box cover is installed by the bearing. on the protruding outer hub of the planetary gear carrier, and the gear case cover and the periphery of the gear case body are fixed with screws; the wheel is fixed on the protruding outer hub of the sun gear with a key, so that the sun gear drives the wheels to wind together The central axis rotates freely;

It can be seen from this that the combination of the gear box body and the gear box cover can rotate freely around the central axis under the support of the bearing respectively, the planetary gear carrier and the central axis are fixed, and the three planetary gears can pass around the planetary gear through the bearing. When the gear shaft rotates, the inner gear and the outer ratchet sleeve mesh with each other outside the three planetary gears, and the inner side of the three planetary gears meshes with the central gear. This gear mechanism looks like a planetary gear train, but is actually a fixed shaft gear train;

It also includes a scratching handle mechanism. The scratching handle mechanism is composed of a scratching handle and a pawl. The scratching handle is fixed on the gear box body by screws and is in a position suitable for manual scratching. The tail of the pawl is hinged on the inner surface of the gear box body with a pin shaft. The tip of the pawl is stuck on the outer ratchet teeth of the outer ratchet of the internal gear. When the handle swings, the pawl drives the fixed axle gear train to work, and finally drives the wheel to rotate;

In order to facilitate turning, a braking mechanism is also installed on the fixed-axis wheel train, and the braking mechanism includes a brake belt, a brake wire, a brake handle and a guide connecting piece; the brake handle and the guide and guide connecting piece are hinged by a pin shaft On the scribing handle, one end of the brake band is hinged on the inner circular surface of the gear box body by the pin shaft, and after a half circle of the inner circular surface is close to the inner circular surface, the other end protrudes from the gear box body and is hinged on the guide connecting piece, One end of the brake cable is connected to the guide connector, and the other end is connected to the brake handle. When the brake handle is gripped, the brake belt can be gripped by the inner gear and the outer ratchet to generate braking; Brake to achieve steering.

A cover is provided on the opening at the hinge of the brake belt of the gear box to prevent the entry of mud and dust.

The operation method and working principle of the present invention are as follows: a person sits on a wheelchair, respectively holds the rowing handles on both sides with both hands, and pulls the rowing upward forcefully, just like rowing a boat, it will drive the gear box to rotate an angle around the central axis At the same time, under the action of the pawl, the outer ratchet of the inner gear also rotates by the same angle. Under the meshing of the outer ratchet of the inner gear, the three planetary gears and the central gear, the wheel is driven forward; when the handle returns, the pawl The wheelchair will continue to move forward under the action of inertia, and the wheelchair will continue to move forward by repeating the pulling action; when it needs to turn, stop the pulling action on one side. , Operate the brake handle on one side to slow down or brake the wheels on one side to achieve steering.

Positive effects of the present invention:

1. This kind of swing-type wheelchair can walk as long as two hands hold the handle on both sides and pull the stroke upwards forcefully at the same time. This swinging action is like rowing a boat, which is very coordinated with the human body's movement habits. There is no need to hold the rim of the wheel hard and to change the position of the hand back and forth without letting go, the operation is easy to move, and the opponent will not cause damage.

当划柄转动α角度时，中心齿轮带动车轮转动角度为

从此式子可以看出，当手握划柄往后拉转动一个角度时，内齿轮外棘轮也随着转动了相同的角度，车轮往前转动i倍的角度；采用齿轮进行增速传动，在轮椅同样前进速度的条件下，划柄往推拉的频率减少，虽然初始时臂力增大、起步慢，但行进起来后，人不必那么拼命地忙活，只要克服了加速度行起来便十分轻松。2. Because the outer ratchet of the inner gear and the three planetary gears and the central gear mesh with each other, it looks like a planetary gear train, but it is actually a fixed shaft gear train. The function of the planetary gear can only change the rotation direction without affecting the speed ratio. The number of teeth is Z ₁ , the number of teeth of the inner gear and the outer ratchet is Z _{3, and} the number of teeth of the planetary gear is Z _2, , and the transmission ratio is:

When the handle is rotated by an angle of α, the center gear drives the wheel to rotate by an angle of

It can be seen from this formula that when the handle is pulled back and rotated by an angle, the inner gear and the outer ratchet also rotate by the same angle, and the wheel rotates forward by an angle of i times; Under the condition of the same forward speed of the wheelchair, the frequency of pushing and pulling the handle decreases. Although the arm strength increases and the start is slow at the beginning, after walking, people do not have to work so hard, as long as the acceleration is overcome, it is very easy to walk.

4. Due to the use of a ratchet transmission mechanism, the wheelchair will not go backwards when going uphill, preventing the danger of going backwards.

5. Because the transmission system of the two wheels is relatively independent, gently braking the brake handle on one side will pull the guide connector through the brake wire, and then pull the brake belt upward, and the brake belt will touch the outer surface on the semicircle. The ratchet produces friction, which brakes the wheel to slow down and enable smooth turns. Compared with the existing wheelchair hand, the hand grabs the wheel to brake, reducing the friction damage of the opponent.

Description of drawings

1 is a front view of an embodiment;

Fig. 2 is the A-A sectional view of Fig. 1;

FIG. 3 is an enlarged view of the right part of FIG. 2 , mainly showing the structure of the fixed axle gear train.

Legend description: 1-internal gear outer ratchet, 2-bearing A, 3-planet gear, 4-bearing B, 5-center shaft, 6-round nut, 7-bearing C, 8-wheel, 9-key A, 10 -Sun gear, 11-Bearing D, 12-Case, 13-Key B, 14-Bearing E, 15-Planet gear carrier, 16-Planet gear shaft, 17-Case cover, 18-Screw A, 19-Screw B, 20-Load bearing bush, 21-Universal wheel, 22-Wheelchair seat frame, 23-Brake wheel handle, 24-Brake wire, 25-Scratch handle, 26-Guide connector, 27-Pawl, 28-Cover, 29 -Brake band.

Detailed ways

As shown in Figures 1, 2, and 3, a swing-type wheelchair includes a wheelchair seat frame 22, a wheel 8, a central shaft 5, and a universal wheel 21. The rear bottom of the wheelchair seat frame 22 passes through a bearing bush 20, a The screw 19B is fixed on the central shaft 5, the two universal wheels 21 are installed on the front bottom of the wheelchair seat frame 22, the two wheels 8 are installed on both ends of the central shaft 5 through the bearing C7 and are axially fastened by the round nut 6 ; Also includes, a gear box is installed on the inner side of the wheel 8, and a fixed axis gear train is arranged in the gear box; Shaft 16, inner gear and outer ratchet 1. Composition; the specific structure of the fixed shaft gear train is that the planetary gear carrier 15 is fixed on the central shaft 5 through the key B13, the central gear 10 is installed on the central shaft 5 through the bearing B4, three The planetary gear shaft 16 is fixed in the hole of the planetary gear carrier 15, the three planetary gears 3 are mounted on the planetary gear shaft 16 through the bearing A2, the inner side of the three planetary gears 3 meshes with the sun gear 10, and the three planetary gears 3 The outer side meshes with the inner gear outer ratchet 1 on which the floating sleeve is placed; the above-mentioned central gear 10 and the planetary gear carrier 15 are provided with an outer hub that protrudes outward, and the box body 12 and the box cover 17 of the gear box pass through the bearing D11 respectively. and the bearing E14 are movably supported on the two outer hubs; the wheel 8 is fixed on the outer hub of the central gear 10 exposed from the box with the key A 9, and the central gear 10 drives the wheel 8 to rotate together when it rotates; the above-mentioned gears The case cover 17 and the gear case body 12 are fastened with screws A18.

It can be seen from this that the central gear 10 and the wheel 8 can rotate around the central axis 5 under the support of the two bearings C7 and the bearing D11. Under the support, it can rotate freely around the central axis 5, the planetary gear carrier 15 and the central axis 5 are fixed, the three planetary gears 3 can rotate around the planetary gear axis 16 through the bearing A2, the inner gear outer ratchet 1 and the three The three planetary gears mesh with the inner side of the three planetary gears 3 and the central gear 10. This gear mechanism looks like a planetary gear train, but is actually a fixed-axis gear train.

It also includes a scratching handle mechanism. The scratching handle mechanism includes a scratching handle 25 and a pawl 27. The scratching handle 25 is fixed on the outer hub protruding from the gear box body 12 by screws, and is fixed at a position suitable for hand-pulling. The tail of the pawl 27 is The pin shaft is hinged on the inner cylindrical surface of the gear box 12, and the tip of the pawl 27 is clamped on the outer ratchet teeth of the outer ratchet wheel 1 of the inner gear. When the handle 25 swings, it drives the central gear 10 to rotate.

It also includes a braking mechanism, which is composed of a braking belt 29, a braking wire 24, a braking handle 23 and a guide connecting piece 26; one end of the braking belt 29 is hinged on the inner cylindrical surface of the gear box body 12 by a pin shaft, and is close to the cylindrical surface After half a turn, the other end protrudes from the gear box body 12 and is hinged on the guide connector 26. The connector 26 is hinged on the scribing handle 25 by the pin. One end of the brake wire 24 is connected to the guide connector 26, and one end is connected to the brake handle 23. On the upper side, the brake handle 23 is hinged on the scratch handle 25 by the pin; when the brake handle 23 is gripped, the brake band 29 can hold the inner gear and the outer ratchet 1 to generate braking.

A cover 28 is provided on the opening at the hinged joint of the brake band 29 of the gear case 12 to prevent the entry of mud and dust.

The working principle of the operation method of the present invention is as follows: a person sits on a wheelchair, respectively holds the rowing handles 25 on both sides with both hands, and pulls the rowing force upwards, just like rowing a boat, the gear box 12 will be driven around the central axis 5 Rotate an angle, and at the same time, under the action of the pawl 27, the outer ratchet 1 of the inner gear also rotates by the same angle. When the rowing handle returns, the pawl is released from the tooth slot and the rowing handle returns to its original position with no load. Under the action of inertia, the wheelchair will continue to move forward. Repeat this rowing action, and the wheelchair will move forward continuously; when When it is necessary to turn, stop the pulling action on one side, and operate the brake handle 25 on one side to slow down or brake the wheels on one side to realize steering.

Claims (3)

1. A wheelchair for swinging motion, comprising a wheelchair main body consisting of a wheelchair seat frame, two wheels, a central axis, and a universal wheel; There is a fixed-axis gear train inside; the above-mentioned fixed-axis gear train is composed of a planetary gear carrier, a central gear, three planetary gears, and an inner gear and an outer ratchet; the planetary gear carrier is fixedly connected to the central shaft, and the central gear passes through the bearing. It is movably installed on the central shaft, and the three planetary gears are evenly installed on the planetary gear carrier through the planetary gear shaft. The ratchet is meshed; the above-mentioned central gear and the planetary gear carrier are provided with an outer hub that protrudes outward, and the box body and the box cover of the gear box are respectively movably supported on the two outer hubs; On the exposed outer hub of the central gear, when the central gear rotates, it drives the wheels to rotate together; It also includes a scratching handle mechanism. The mechanism consists of a scratching handle and a pawl. The scratching handle is fixed on the gear box body and is in a position suitable for manual scratching. The tail of the pawl is hinged on the inner surface of the gear box body. On the outer ratchet teeth of the outer ratchet wheel of the inner gear, when the handle swings, the pawl drives the fixed axle gear train to work, and finally drives the wheel to rotate; It also includes a brake mechanism, which is composed of a brake band, a brake wire, a brake handle and a guide connector; the brake handle and the guide connector are respectively hinged on the draw handle, and one end of the brake band is hinged on the The inner circular surface of the gear box body is close to the inner circular surface for half a circle, and the other end protrudes from the gear box body and is hinged on the guide connector. One end of the brake wire is connected to the guide connector, and the other end is connected to the brake handle. When the brake handle is used, the brake belt can be gripped by the inner gear and the outer ratchet to generate braking. 2. A swing-type wheelchair according to claim 1, characterized in that the box body and the box cover of the gear box are movably supported on the two outer hubs through bearings; the wheels are fixed on the two outer hubs by keys. On the outer hub of the sun gear exposed from the case. 3. A method of operating a wheelchair for rowing and pendulum movement according to claim 1, wherein a person sits on the wheelchair, holds the rowing handles on both sides with both hands, and simultaneously pulls the rowing force upwards to drive the The gear box rotates at an angle, and at the same time, under the action of the pawl, the outer ratchet of the inner gear also rotates by the same angle. Under the action of the fixed-axis gear train, the wheel is driven forward; when the handle returns, the pawl is separated from the tooth slot. The stroke handle returns to its original position with no load. Under the action of inertia, the wheelchair will continue to move forward, repeating the stroke, and the wheelchair will keep moving forward; when it is necessary to turn, stop the stroke on one side and operate the other side. The brake lever on one side slows or brakes the wheels on one side to achieve steering.

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