Wheelchair with bidirectional ratchet transmission mechanism and usage thereof

Abstract

The main problem solved by the present invention is how to make the wheelchair easier to push and safe to use. A wheelchair with a bidirectional ratchet transmission mechanism is characterized in that it includes wheels, axles, a seat, a ratchet mechanism, and a rowing rod. The ratchet mechanism includes a ratchet, a flywheel, and a pawl. The ratchet and the flywheel are coaxial. The flywheel is located on the outer ring of the ratchet. The pawl is located between the ratchet and the flywheel. The pawl enables the flywheel to drive the ratchet to rotate in one direction. The edge of the flywheel has teeth. The ratchet and the wheel are coaxial. The two are relatively fixed and rotate synchronously. There are four ratchet mechanisms, two on each side of the wheelchair, and the flywheels of the two ratchet mechanisms on each side can drive the ratchet to rotate in opposite directions. The beneficial effects are: first, the rowing rod can be rowed back and forth by holding the rowing rod, and there is almost no need to bend over, which is convenient for exerting force. Secondly, the height of the hand is always higher than the wheel during use, eliminating the safety hazard of the wheel hitting the hand.

Description

Technical Field

[0001] The present invention relates to the technical field of wheelchairs, in particular to a wheelchair with a bidirectional ratchet transmission mechanism. Background Art

[0002] Existing wheelchairs usually have a steel ring outside the wheel, and the wheel is pushed to rotate by holding the steel ring. First, because the height of the steel ring is lower than the wheel, the hand position is low when using it, and it is difficult to exert force. Secondly, because the diameter of the steel ring is smaller than the wheel, it is more difficult to push. Finally, when holding the steel ring, the hand may be hit by the wheel, which has certain safety hazards. Summary of the invention

[0003] The main problem solved by the present invention is how to make the wheelchair easier to push and safer to use.

[0004] A wheelchair with a bidirectional ratchet transmission mechanism, characterized in that it includes wheels, axles, a seat, a ratchet mechanism, and a rowing rod, wherein the axle is the rotating axis of the wheel, the seat is located on the axle, the ratchet mechanism includes a ratchet, a flywheel, and a pawl, the ratchet and the flywheel are coaxial, the flywheel is located on the outer ring of the ratchet, the pawl is located between the ratchet and the flywheel, the pawl enables the flywheel to drive the ratchet to rotate in one direction, the edge of the flywheel has teeth, the ratchet and the wheel are coaxial, the two are relatively fixed and rotate synchronously, there are four ratchet mechanisms, two on each side of the wheelchair, and the flywheels of the two ratchet mechanisms on each side can drive the ratchet to rotate in opposite directions,

[0005] The upper end of the rowing rod is higher than the wheel, and the lower end of the rowing rod is connected to the wheel axle through a rotating shaft. The axis directions of the rotating shaft and the wheel axle are perpendicular to each other. There are two rowing rods, which are respectively located on the left and right sides of the wheelchair, wherein the rowing rod on each side is located between the two ratchet structures on the same side. There are blocks on both sides of the rowing rod, and the blocks are blocks protruding from the surfaces of both sides of the rowing rod. The blocks can be inserted between the teeth of the flywheel.

[0006] When in use, the rowing rod is held and pressed inward or outward to rotate the rowing rod around the rotating shaft, and the clamping block is inserted between the teeth of the flywheel. At the same time, the rowing rod is rowed back and forth to drive the ratchet mechanism and the wheel to rotate, thereby pushing the wheelchair to move.

[0007] The beneficial effect is that the upper end of the rowing rod is higher than the wheel. First, when using the wheelchair, the human body can hold the rowing rod and row it forward and backward, almost without bending over, which is convenient for exerting force. Secondly, the distance between the upper end of the rowing rod and the wheel axle is large, which is relatively labor-saving. Finally, when using the wheelchair, the height of the hand is always higher than the wheel, eliminating the safety hazard of the wheel hitting the hand. In addition, the hand holding the rowing rod and pressing it inward or outward, that is, the hand holding the rowing rod shrinks to the inside of the human body or expands to the outside, which is in line with the human body's force. Moreover, the hand only needs to hold the rowing rod all the time, and there is no need to switch the position of the hand holding steel ring like the prior art. The use is intuitive, convenient, clean and hygienic. At the same time, the flywheels of the two ratchet mechanisms on each side can drive the ratchet wheels to rotate in opposite directions, that is, rowing the rowing rod forward or backward can push the wheelchair forward and backward, and the wheelchair can move forward or backward, which is convenient to use. In addition, by adjusting the rowing speed of the left and right rowing rods of the wheelchair, the wheelchair can be controlled to turn (for example, the left rowing rod is rowed faster, and the wheelchair turns right), and turning is very convenient. The ratchet structure can refer to the flywheel mechanism of the prior art bicycle, which belongs to the mature prior art, and the structure of the ratchet and the like will not be described in detail in the present invention.

[0008] The two ratchet mechanisms located on the inner side of the wheelchair can make the wheelchair move forward. When the rowing bar is pressed inward and rowed forward by hand, the two ratchet mechanisms drive the wheelchair forward; the two ratchet mechanisms located on the outer side of the wheelchair can make the wheelchair move backward. When the rowing bar is pressed outward and rowed backward by hand, the two ratchet mechanisms drive the wheelchair move backward.

[0009] The beneficial effect is that holding the rowing pole and pressing it inwards rather than outwards is more in line with the human body's force, and is suitable for the forward function with high frequency of use. In addition, since the forward function is more important, the corresponding ratchet structure can be increased in thickness during production to improve its quality.

[0010] The rowing rod has magnetism at the part below the block. When the rowing rod is pressed inward or outward by hand, the rowing rod contacts the ratchet mechanism and generates attraction, so that after the rowing rod stops being pressed inward, the rowing rod and the ratchet mechanism still keep in contact.

[0011] The beneficial effect is that it is not necessary to keep pressing, which is labor-saving. At the same time, it is not necessary to frequently adjust the card block to be inserted between the teeth of the flywheel. The operation is convenient and the wear caused by the card block inserted between the teeth of the flywheel can be reduced. In addition, because the flywheel can only drive the ratchet wheel in one direction, the ratchet wheel can also drive the flywheel in one direction. When the wheelchair wheel rotates by inertia (for example, when the wheelchair moves forward downhill), the ratchet wheel cannot drive the flywheel, and the card block does not need to be separated from the teeth of the flywheel.

[0012] The teeth of the flywheel are inclined on the side facing the rowing rod, that is, the spacing between the teeth of the flywheel is larger on the side facing the rowing rod than on the side away from the rowing rod. The inclined surface can improve the efficiency of inserting the block between the teeth of the flywheel.

[0013] The beneficial effect is that the inclined surface can improve the efficiency of inserting the card block between the teeth of the flywheel, that is, the inclined surface has an introduction effect, the card block is more easily inserted between the teeth of the flywheel along the inclined surface, and the efficiency of switching the card block to be inserted between the teeth of the left and right flywheels is improved.

[0014] The lower end of the rowing rod has two forks, the two forks are respectively located on both sides of the wheel axle, and the rotating shaft passes through the wheel axle and the two forks; the ratchet mechanisms are all located on the outside of the wheels.

[0015] The beneficial effect is that the two forks make the structure and force of the rowing rod more stable, and it is not easy to deform laterally when in use. The ratchet mechanisms are all located outside the wheels, which, on the one hand, facilitates the installation and rowing of the rowing rod, and on the other hand, reduces the wheelbase, making the overall structure more compact.

[0016] It also includes a limiting ring, which is installed on the seat. The rowing rod passes through the limiting ring, and the limiting ring limits the forward and backward rowing range of the rowing rod; the seat is provided with an armrest, and the limiting ring is installed on the outer side of the armrest.

[0017] The beneficial effect is that the limiting ring limits the forward and backward rowing range of the rowing rod, preventing the rowing rod from falling forward or backward to the ground.

[0018] It also includes a rubber sleeve, which is matched with the tooth shape of the rowing rod. The rubber sleeve is sleeved on the teeth of the rowing rod, and the rubber sleeve can be disassembled and replaced.

[0019] The beneficial effect is that since the rowing rod and the teeth of the flywheel need to contact and rub frequently, the rubber sleeve can increase the friction force and reduce the friction damage between the teeth of the rowing rod and the flywheel. Timely disassembly and replacement of the rubber sleeve can significantly increase the service life of the rowing rod and the flywheel.

[0020] The method for using the wheelchair is characterized by comprising the following steps:

[0021] When the wheelchair needs to move forward, the person sits on the wheelchair, holds the rowing bar and presses it inward, so that the rowing bar moves inward, and the rowing bar is engaged with the teeth of the ratchet mechanism. At the same time, the rowing bar is rowed forward, which drives the rowing bar sleeve to move, and together drives the ratchet mechanism and the wheel to rotate, pushing the wheelchair forward;

[0022] When the wheelchair needs to move backward, the person sits on the wheelchair, holds the rowing rod and presses it outward, so that the rowing rod moves outward, so that the rowing rod meshes with the teeth of the ratchet mechanism, and at the same time, the rowing rod is moved backward to push the wheelchair backward;

[0023] When the inertial motion of the wheelchair needs to be maintained, the position of the rowing bar is kept unchanged, or the rowing bar is rowed in the opposite direction, and the ratchet mechanism can prevent the rowing bar from affecting the inertial rotation of the wheel.

[0024] The beneficial effects are as follows: first, when in use, the human body sits on the wheelchair, and the rowing rod can be rowed forward and backward by holding the rowing rod, and there is almost no need to bend over, which is convenient for exerting force; secondly, the distance between the upper end of the rowing rod and the wheel axle is large, which is relatively labor-saving; finally, when in use, the height of the hand is always higher than the wheel, eliminating the safety hazard of the wheel hitting the hand. In addition, the rowing rod is pressed inward or outward by holding the rowing rod, that is, the rowing rod is contracted inward or expanded outward by holding the rowing rod, which is in line with the human body's force exertion, and the hand only needs to hold the rowing rod all the time, and there is no need to switch the position of the hand holding steel ring as in the prior art, which is intuitive, convenient, clean and hygienic to use. At the same time, the flywheels of the two ratchet mechanisms on each side can drive the ratchet wheels to rotate in opposite directions, that is, rowing the rowing rod forward or backward can push the wheelchair forward and backward, and the wheelchair can move forward or backward, which is convenient to use. When the wheelchair wheel rotates by inertia, the ratchet mechanism makes the rowing rod stop or row in the opposite direction without resistance, avoiding the rowing rod from affecting the inertial rotation of the wheel. Obviously, the ratchet mechanism cannot be used for braking. The wheelchair described in the present invention needs to be equipped with a brake mechanism. The specific brake mechanism can refer to existing wheelchairs (for example, a hand-held brake mechanism is installed on the rear armrest of the wheelchair, etc.), which is a mature existing technology and will not be described in detail.

[0025] After completing each forward or backward stroke of the rowing rod, the rowing rod is reset in the opposite direction in time to prepare for the next stroke. The ratchet mechanism can prevent the influence of the resetting of the rowing rod on the rotation of the wheel.

[0026] The beneficial effect is that when the rowing rod is reset in the opposite direction, the ratchet mechanism allows the rowing rod to be rowed without resistance, so that the rowing rod can be quickly reset in the opposite direction to prepare for the next rowing.

[0027] When the wheelchair needs to turn right, the rowing speed of the left side of the wheelchair can be greater than that of the right side; when the wheelchair needs to turn left, the rowing speed of the right side of the wheelchair can be greater than that of the left side.

[0028] The beneficial effect is that the wheelchair can be controlled to turn by adjusting the rowing speed of the left and right rowing bars, and the turning is very convenient. It should be noted that the rowing speed of the rowing bar on one side is greater than that of the other side, including the case where the rowing speed of the other side is zero and the direction is opposite. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 . Schematic diagram of the overall structure of the present invention (when holding the rowing rod and pressing it inward);

[0030] Figure 2 .Schematic diagram of the enlarged structure of the local area of ​​the card block;

[0031] Figure 3 .Schematic diagram of the rowing rod structure;

[0032] Figure 4 .Schematic diagram of the assembly structure of the rowing rod and ratchet mechanism;

[0033] Figure 5 .Schematic diagram of the enlarged structure of a local area of ​​the ratchet mechanism;

[0034] Figure 6 .Side view of the assembly structure of the rowing rod and ratchet mechanism;

[0035] Figure 7 .Schematic diagram of the structure when holding the rowing pole, pressing inward and rowing forward

[0036] Figure 8 .Schematic diagram of the structure when holding the rowing pole and pressing it outward;

[0037] Fig. 9 .Schematic diagram of the enlarged structure of the local area of ​​the block when the rowing pole is pressed outward.

[0038] In the figure: 1. wheel, 2. axle, 3. seat, 4. ratchet mechanism, 41. flywheel, 411. teeth, 42. ratchet, 5. row bar, 51. fork, 52. block, 6. rotating shaft, 7. limit ring, 31. armrest. DETAILED DESCRIPTION

[0039] Example 1

[0040] like Figure 1-9 As shown, a wheelchair with a bidirectional ratchet transmission mechanism is characterized in that it includes wheels, axles, a seat, a ratchet mechanism, and a rowing rod, wherein the axle is the rotating axis of the wheel, and the seat is located on the axle. The ratchet mechanism includes a ratchet, a flywheel, and a pawl. The ratchet and the flywheel are coaxial, and the flywheel is located on the outer ring of the ratchet. The pawl is located between the ratchet and the flywheel. The pawl enables the flywheel to drive the ratchet to rotate in one direction. The edge of the flywheel has teeth, and the ratchet and the wheel are coaxial. The two are relatively fixed and rotate synchronously. There are four ratchet mechanisms, two on each side of the wheelchair, and the flywheels of the two ratchet mechanisms on each side can drive the ratchet to rotate in opposite directions.

[0041] The upper end of the rowing rod is higher than the wheel, and the lower end of the rowing rod is connected to the wheel axle through a rotating shaft. The axis directions of the rotating shaft and the wheel axle are perpendicular to each other. There are two rowing rods, which are respectively located on the left and right sides of the wheelchair, wherein the rowing rod on each side is located between the two ratchet structures on the same side. There are blocks on both sides of the rowing rod, and the blocks are blocks protruding from the surfaces of both sides of the rowing rod. The blocks can be inserted between the teeth of the flywheel.

[0042] When in use, the rowing rod is held and pressed inward or outward to rotate the rowing rod around the rotating shaft, and the clamping block is inserted between the teeth of the flywheel. At the same time, the rowing rod is rowed back and forth to drive the ratchet mechanism and the wheel to rotate, thereby pushing the wheelchair to move.

[0043] The two ratchet mechanisms located on the inner side of the wheelchair can make the wheelchair move forward. When the rowing bar is pressed inward and rowed forward by hand, the two ratchet mechanisms drive the wheelchair forward; the two ratchet mechanisms located on the outer side of the wheelchair can make the wheelchair move backward. When the rowing bar is pressed outward and rowed backward by hand, the two ratchet mechanisms drive the wheelchair move backward.

[0044] The rowing rod has magnetism at the part below the block. When the rowing rod is pressed inward or outward by hand, the rowing rod contacts the ratchet mechanism and generates attraction, so that after the rowing rod stops being pressed inward, the rowing rod and the ratchet mechanism still keep in contact.

[0045] The teeth of the flywheel are inclined on the side facing the rowing rod, that is, the spacing between the teeth of the flywheel is larger on the side facing the rowing rod than on the side away from the rowing rod. The inclined surface can improve the efficiency of inserting the block between the teeth of the flywheel.

[0046] The lower end of the rowing rod has two forks, the two forks are respectively located on both sides of the wheel axle, and the rotating shaft passes through the wheel axle and the two forks; the ratchet mechanisms are all located on the outside of the wheels.

[0047] It also includes a limiting ring, which is installed on the seat. The rowing rod passes through the limiting ring, and the limiting ring limits the forward and backward rowing range of the rowing rod; the seat is provided with an armrest, and the limiting ring is installed on the outer side of the armrest.

[0048] It also includes a rubber sleeve, which is matched with the tooth shape of the rowing rod. The rubber sleeve is sleeved on the teeth of the rowing rod, and the rubber sleeve can be disassembled and replaced.

[0049] Example 2

[0050] The method for using the wheelchair is characterized by comprising the following steps:

[0051] When the wheelchair needs to move forward, the person sits on the wheelchair, holds the rowing bar and presses it inward, so that the rowing bar moves inward, and the rowing bar is engaged with the teeth of the ratchet mechanism. At the same time, the rowing bar is rowed forward, which drives the rowing bar sleeve to move, and together drives the ratchet mechanism and the wheel to rotate, pushing the wheelchair forward;

[0052] When the wheelchair needs to move backward, the person sits on the wheelchair, holds the rowing rod and presses it outward, so that the rowing rod moves outward, so that the rowing rod meshes with the teeth of the ratchet mechanism, and at the same time, the rowing rod is moved backward to push the wheelchair backward;

[0053] When the inertial motion of the wheelchair needs to be maintained, the position of the rowing bar is kept unchanged, or the rowing bar is rowed in the opposite direction, and the ratchet mechanism can prevent the rowing bar from affecting the inertial rotation of the wheel.

[0054] After completing each forward or backward stroke of the rowing rod, the rowing rod is reset in the opposite direction in time to prepare for the next stroke. The ratchet mechanism can prevent the influence of the resetting of the rowing rod on the rotation of the wheel.

[0055] When the wheelchair needs to turn right, the rowing speed of the left side of the wheelchair can be greater than that of the right side; when the wheelchair needs to turn left, the rowing speed of the right side of the wheelchair can be greater than that of the left side.

Claims

1. A wheelchair with a bidirectional ratchet transmission mechanism, characterized in that: It includes a wheel, an axle, a seat, a ratchet mechanism, and a rowing rod. The axle is the rotating axis of the wheel, and the seat is located on the axle. The ratchet mechanism includes a ratchet, a flywheel, and a pawl. The ratchet and the flywheel are coaxial. The flywheel is located on the outer ring of the ratchet. The pawl is located between the ratchet and the flywheel. The pawl enables the flywheel to drive the ratchet to rotate in one direction. The edge of the flywheel has teeth. The ratchet and the wheel are coaxial, and the two are relatively fixed and rotate synchronously. There are four ratchet mechanisms, two on each side of the left and right sides of the wheelchair, and the flywheels of the two ratchet mechanisms on each side can drive the ratchet to rotate in opposite directions. The upper end of the rowing rod is higher than the wheel, and the lower end of the rowing rod is connected to the wheel axle through a rotating shaft. The axis directions of the rotating shaft and the wheel axle are perpendicular to each other. There are two rowing rods, which are respectively located on the left and right sides of the wheelchair, wherein the rowing rod on each side is located between the two ratchet structures on the same side. There are blocks on both sides of the rowing rod, and the blocks are blocks protruding from the surfaces of both sides of the rowing rod. The blocks can be inserted between the teeth of the flywheel. When in use, the rowing rod is held and pressed inward or outward to rotate the rowing rod around the rotating shaft, and the clamping block is inserted between the teeth of the flywheel. At the same time, the rowing rod is rowed back and forth to drive the ratchet mechanism and the wheel to rotate, thereby pushing the wheelchair to move.

2. A wheelchair with a bidirectional ratchet transmission mechanism according to claim 1, characterized in that: The two ratchet mechanisms located on the inner side of the wheelchair can make the wheelchair move forward. When the rowing bar is pressed inward and rowed forward by hand, the two ratchet mechanisms drive the wheelchair forward; the two ratchet mechanisms located on the outer side of the wheelchair can make the wheelchair move backward. When the rowing bar is pressed outward and rowed backward by hand, the two ratchet mechanisms drive the wheelchair move backward.

3. A wheelchair with a bidirectional ratchet transmission mechanism according to claim 1, characterized in that the rowing rod has magnetism at the part below its block, and when the rowing rod is pressed inward or outward by hand, the rowing rod contacts with the ratchet mechanism and generates attraction, so that after the rowing rod stops being pressed inward, the rowing rod and the ratchet mechanism still maintain contact.

4. A wheelchair with a bidirectional ratchet transmission mechanism according to claim 1, characterized in that: The teeth of the flywheel are inclined on the side facing the rowing rod, that is, the spacing between the teeth of the flywheel is larger on the side facing the rowing rod than on the side away from the rowing rod. The inclined surface can improve the efficiency of inserting the block between the teeth of the flywheel.

5. A wheelchair with a bidirectional ratchet transmission mechanism according to claim 1, characterized in that: The lower end of the rowing rod has two forks, the two forks are respectively located on both sides of the wheel axle, and the rotating shaft passes through the wheel axle and the two forks; the ratchet mechanisms are all located on the outside of the wheels.

6. A wheelchair with a bidirectional ratchet transmission mechanism according to claim 1, characterized in that it also includes a limit ring, which is installed on the seat, and the rowing rod passes through the limit ring, and the limit ring limits the forward and backward rowing range of the rowing rod; the seat has armrests, and the limit ring is installed on the outside of the armrests.

7. A wheelchair with a bidirectional ratchet transmission mechanism according to claim 1, characterized in that it also includes a rubber sleeve, the rubber sleeve is matched with the tooth shape of the rowing rod, the rubber sleeve is sleeved on the teeth of the rowing rod, and the rubber sleeve can be removed and replaced.

8. The method of using a wheelchair with a bidirectional ratchet transmission mechanism as claimed in claim 2, characterized in that: The steps include: When the wheelchair needs to move forward, the person sits on the wheelchair, holds the rowing bar and presses it inward, so that the rowing bar moves inward, and the rowing bar is engaged with the teeth of the ratchet mechanism. At the same time, the rowing bar is rowed forward, which drives the rowing bar sleeve to move, and together drives the ratchet mechanism and the wheel to rotate, pushing the wheelchair forward; When the wheelchair needs to move backward, the person sits on the wheelchair, holds the rowing rod and presses it outward, so that the rowing rod moves outward, so that the rowing rod meshes with the teeth of the ratchet mechanism, and at the same time, the rowing rod is moved backward to push the wheelchair backward; When the inertial motion of the wheelchair needs to be maintained, the position of the rowing bar is kept unchanged, or the rowing bar is rowed in the opposite direction, and the ratchet mechanism can prevent the rowing bar from affecting the inertial rotation of the wheel.

9. The method of using the wheelchair with a bidirectional ratchet transmission mechanism according to claim 8, characterized in that: After completing each forward or backward stroke of the rowing rod, the rowing rod is reset in the opposite direction in time to prepare for the next stroke. The ratchet mechanism can prevent the influence of the resetting of the rowing rod on the rotation of the wheel.

10. The method of using a wheelchair with a bidirectional ratchet transmission mechanism according to claim 8, wherein: When the wheelchair needs to turn right, the rowing speed of the left side of the wheelchair can be greater than that of the right side; when the wheelchair needs to turn left, the rowing speed of the right side of the wheelchair can be greater than that of the left side.

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