CN221866350U - Caster damping device of wheelchair - Google Patents

Abstract

The utility model discloses a caster shock-absorbing device of a wheelchair, which comprises a rear caster, a caster axle core assembly and an inclined rear foot rod, wherein the inclined rear foot rod is obliquely arranged from back to front; the elastic damping device of the product can weaken larger shock waves, so that the shock waves of the inclined foot bar bearing the gravity are greatly reduced, the patient sits more comfortably, and the shock sensation is reduced; the small vibration waves can be basically eliminated, so that a patient sits on the wheelchair without shock; the damping device is stable when the wheelchair is used, and the caster wheel is used for providing balanced damping when the caster wheel runs into a hollow, raised over-ridge, uneven road surface in the rolling process of the road surface, and the damping device for the caster wheel has good balanced damping effect.

Description

Caster shock absorbing device for wheelchair

Technical Field

The utility model relates to wheelchair components, in particular to a caster shock absorbing device.

Background Art

For example 1: Chinese patent document publication number CN217917468U discloses a caster shock absorber device. This product has a caster mounting fork opening between the left fork arm and the right fork arm of the caster fork and is installed with a rolling caster. Corresponding longitudinal long strip-type left axle holes and longitudinal long strip-type right axle holes are horizontally opened at the bottom of the left fork arm and the fork arm; the caster shaft core crosses the rolling caster and passes through the corresponding longitudinal long strip-type left axle hole and longitudinal long strip-type right axle hole to the outside; the left and right outer ends of the caster shaft core are connected with corresponding left and right caster shock absorbers, and the left and right caster shock absorbers are movably connected to the outer walls of the corresponding left and right fork arms.

The caster shock-absorbing device of the above-mentioned product is mainly used for the front wheels of wheelchairs. It is suitable for wheelchairs with upright front foot rods and vertical installation. It is not suitable for wheelchairs with rear foot rods tilted from back to front. Therefore, it is necessary to develop a new shock-absorbing device with shock-absorbing function that is suitable for wheelchairs with rear foot rods tilted from back to front.

For example 2: Chinese patent document publication number CN210250325U discloses a folding wheelchair, wherein the bottom end of the backrest frame is movably connected to the rear end of the seat; the upper ends of the left front foot rod and the right front foot rod are movably connected to the left and right front ends of the back side of the corresponding seat; the left rear foot rod and the right rear foot rod are inclined from the back to the front; the upper ends of the left rear foot rod and the right rear foot rod are movably connected to the left and right front ends of the back side of the corresponding seat; the left front foot rod, the right front foot rod, and the left rear foot rod are The bottom ends of the right and rear foot rods are connected with casters; the left and right sides of the bottom end of the chair back frame are movably connected with the left front hinge piece and the right front hinge piece respectively, and the other ends of the left hinge piece and the right hinge piece are movably connected with the corresponding lower sections of the left front foot rod and the right front foot rod; the left and right sides of the bottom end of the chair back frame are movably connected with the left rear hinge piece and the right rear hinge piece respectively, and the left rear hinge piece and the right rear hinge piece are movably connected with the corresponding lower ends of the left rear foot rod and the right rear foot rod; this product can be folded into three sections.

The left rear foot rod and the right rear foot rod of the above-mentioned wheelchair product are inclined from the rear to the front, and casters (i.e., rear casters) are connected to the bottom ends of the left rear foot rod and the right rear foot rod; since the rear foot rod and the right rear foot rod are directly connected to the casters and there is no shock absorbing device, when the rear casters encounter potholes, bumps, or uneven roads during rolling on the road, they can only absorb shock through the elastic colloid material of the caster body. The shock absorbing effect is too small and not obvious. People sitting in the wheelchair feel a noticeable vibration, and the overall shock absorbing effect is not ideal.

Utility Model Content

In order to solve the above technical problems, the utility model provides a caster shock-absorbing device with reasonable structural design, fewer components and good shock-absorbing effect.

The solutions to the above technical problems are:

A wheelchair caster shock-absorbing device comprises a rear caster, a caster shaft core assembly, and an inclined rear foot rod, wherein the inclined rear foot rod is arranged to be inclined from the rear to the front, an outer section of the caster shaft core assembly is transversely movably connected to the middle of the wheel center of the rear caster, an inner section of the caster shaft core assembly is fixedly connected to an elastic shock-absorbing device, and the elastic shock-absorbing device is movably connected to the lower bottom of the inclined rear foot rod.

The beneficial effects of the wheelchair caster shock-absorbing device of the utility model are as follows: the elastic shock-absorbing device of the product can weaken larger shock waves, so that the shock waves of the inclined rear foot rod that bears gravity are greatly reduced, so that the patient can sit more comfortably and reduce the sense of shock; the smaller shock waves can be basically eliminated, so that the patient can sit in the wheelchair without feeling any shock; the shock-absorbing device is used to stabilize the wheelchair cart, and when the rear caster encounters potholes, bumps, and uneven roads during rolling on the road surface, the caster shock-absorbing device provides balanced shock absorption, and its balanced shock absorption effect is good.

BRIEF DESCRIPTION OF THE DRAWINGS

Figure 1 is a perspective view of the product of the utility model;

Figure 2 is a disassembled diagram of the utility model product;

FIG3 is a cross-sectional view of the elastic reset element of the utility model product as an elastic pressure spring;

FIG4 is a cross-sectional view of the elastic reset element of the utility model product as a cylinder.

Rear caster 1, caster shaft core assembly 2, elastic shock absorbing device 3, tilting rear foot rod 4, spring positioning upper protrusion 41, upper screw assembly 42, elastic element fixing component 31, metal shell 31A, elastic element groove 311, spring positioning lower protrusion 312, notch 313, limit lower screw 314, elastic reset element 32, elastic pressure spring 32A, cylinder 32B.

DETAILED DESCRIPTION

A wheelchair caster shock-absorbing device comprises a rear caster 1, a caster shaft core assembly 2, and an inclined rear foot rod 4. The specific structures of the rear caster 1, the caster shaft core assembly 2, and the inclined rear foot rod 4 are prior art products; the inclined rear foot rod 4 is made of aluminum or iron metal tube; the inclined rear foot rod 4 is inclined from the back to the front, and is inclined by about 40 degrees to 50 degrees; the outer section of the caster shaft core assembly 2 crosses and is movably connected to the middle of the wheel center of the rear caster 1, so that the rear caster 1 can roll on the ground relative to the caster shaft core assembly 2; the main technical improvement of this product is that the inner section of the caster shaft core assembly 2 is fixedly connected with an elastic shock-absorbing device 3, the elastic shock-absorbing device 3 and the inclined rear foot rod 4 are arranged on the inner side of the rear caster 1, and the elastic shock-absorbing device 3 is movably connected to the lower bottom of the inclined rear foot rod 4; when this product is used, the rear caster 1 rolls on the ground and encounters uneven roads such as bumps and ridges. or rough and uneven roads, the rear caster 1 and the elastic shock-absorbing device 3 have different degrees of ups and downs, so the elastic shock-absorbing device 3 and the inclined rear foot rod 4 must be flexibly connected to play a shock-absorbing role; the inclined rear foot rod 4 is immovable relative to the rear caster 1 and the elastic shock-absorbing device 3; its vibration source is first transmitted to the elastic shock-absorbing device 3 through the rear caster 1, and the elastic shock-absorbing device 3 weakens the vibration wave; the elastic shock-absorbing device 3 can weaken the larger vibration wave, so that the vibration wave of the inclined rear foot rod 4 that bears gravity is greatly reduced, so that the patient can sit more comfortably and reduce the vibration; the smaller vibration wave can be basically eliminated, so that the patient can sit in the wheelchair without vibration; the shock-absorbing device is used to stabilize the wheelchair cart, and when the rear caster 1 encounters potholes, bumps, and uneven roads during rolling on the road, the caster shock-absorbing device provides balanced shock absorption, and its balanced shock absorption effect is good.

The tire of the rear caster 1 is made of elastic colloid material, and the wheel hub is made of hard plastic. The rear caster 1 made of elastic colloid material has a better shock absorption effect when used in conjunction with the elastic shock absorbing device 3, and has a double shock absorption effect.

Preferred technical solution: the elastic shock absorbing device 3 includes an elastic element fixing component 31 and an elastic reset component 32; the inner section of the caster shaft core assembly 2 is fixedly connected with the elastic element fixing component 31 through a nut assembly; the elastic element fixing component 31 is fixedly connected to one end of the elastic reset component 32 to prevent it from falling off; the elastic element fixing component 31 is movably connected to the lower bottom of the tilted rear foot rod 4 to prevent it from falling off; the other end of the elastic reset component 32 is fixedly connected to the lower bottom of the tilted rear foot rod 4, and the tilted rear foot rod 4 presses the elastic reset component 32, which is a component that bears the gravity of the wheelchair and is also a shock-absorbing elastic component; the rear caster 1 and the elastic element fixing component 31 elastically fluctuate up and down relative to the elastic reset component 32 for shock absorption; the rear caster 1 and the elastic element fixing component 31 fluctuate relative to the tilted rear foot rod 4; this is to further refine the specific structure of the elastic shock absorbing device 3; its vibration source is first transmitted to the elastic element fixing component 31 through the rear caster 1, and then transmitted to the elastic reset component 32, and the elastic reset component 32 weakens the vibration wave.

Preferred technical solution: the elastic element fixing component 31 is a metal shell 31A, which is integrally formed and made of stainless steel or iron; the inner section of the caster shaft core assembly 2 is fixedly connected to the lower section of the metal shell 31A through a nut assembly; the upper section of the metal shell 31A is movably connected to the lower bottom of the tilted rear foot rod 4; an elastic element groove 311 is opened inside the metal shell 31A, and the elastic reset element 32 is longitudinally arranged, and the elastic reset element 32 is arranged in the elastic element groove 311, and the upper end of the elastic reset element 32 is fixedly connected to the lower bottom of the tilted rear foot rod 4, so that the tilted rear foot rod 4 is pressed on it, and the lower end of the elastic reset element 32 is fixedly connected to the bottom of the groove; the elastic element groove 311 is used to place the elastic reset element 32 to prevent it from falling off and stabilizing the elastic reset element 32, so that the elastic reset element 32 is firmly installed/fixed.

Preferred technical solution: the elastic reset element 32 is an elastic pressure spring 32A; the bottom end of one end of the elastic pressure spring 32A is fixedly connected to the elastic element fixing member 31, and the top end of the other end is fixedly connected to the lower bottom of the inclined rear foot rod 4; the elastic pressure spring 32A is a better shock-absorbing component with low cost, universality and good elasticity.

Preferred technical solution: the lower bottom of the inclined rear foot rod 4 protrudes downward and is connected to a spring positioning upper protrusion 41, and the spring positioning upper protrusion 41 is inserted into the upper end spring hole of the elastic pressure spring 32A; the bottom of the elastic element groove 311 protrudes upward and is connected to a spring positioning lower protrusion 312, and the spring positioning lower protrusion 312 is inserted into the lower end spring hole of the elastic pressure spring 32A; the anti-slip and anti-falling effect of the elastic pressure spring 32A is further strengthened.

Preferred technical solution: The top of the elastic element slot 311 is provided with a notch 313, and the bottom of the tilted rear foot rod 4 is inserted into the notch 313 and clamped, so as to prevent the tilted rear foot rod 4 from being deviated to the left or right, so that the tilted rear foot rod 4 and the metal shell 31A are installed more centrally, and the gravity is centered when used, and the shock absorption force is centered, so as to improve the shock absorption effect; the upper section of the metal shell 31A and the bottom of the tilted rear foot rod 4 are jointly crossed by an upper screw assembly 42 to be connected as a whole to prevent falling off, and the upper screw assembly 42 is more universal and easy to assemble. The elastic element slot 311\notch 313 are integrated.

Preferred technical solution: The lower metal shell 31A of the upper screw assembly 42 crosses the limiting lower screw 314, which has a certain limiting effect on the downward movement of the tilted rear foot rod 4. When the wheelchair is transported or folded for storage outside the factory, when the rear leg frame of the wheelchair is folded and lifted up in the air, it prevents the rear caster 1 and the elastic shock-absorbing device 3 from falling too much; the limiting lower screw 314 is located below the lower bottom portion near the tilted rear foot rod 4, and the limiting lower screw 314 crosses the elastic element groove 311.

Preferred technical solution: the elastic reset element 32 is a cylinder 32B (damping cylinder/damper), which can also achieve the shock absorbing effect of this product, but the shock absorbing effect is slightly worse than that of the elastic pressure spring 32A; the base of the cylinder 32B is fixedly connected to the elastic element fixing member 31 by screws, and the telescopic rod of the cylinder 32B is fixedly connected to the lower bottom of the inclined rear foot rod 4 by screws.

Preferred technical solution: The caster shaft core assembly 2 includes a caster shaft core screw and a nut assembly, the caster shaft core screw jointly crosses the middle of the elastic element fixing component 31 and the rear caster 1, and the two ends of the caster shaft core screw are connected and fixed with a nut assembly and a nut to prevent falling off.

Claims (10)

1. A wheelchair caster shock-absorbing device, comprising a rear caster, a caster shaft core assembly, and an inclined rear foot rod, wherein the inclined rear foot rod is arranged to be inclined from the rear to the front, and an outer section of the caster shaft core assembly crosses and is movably connected to the middle of the wheel center of the rear caster, characterized in that an inner section of the caster shaft core assembly is fixedly connected to an elastic shock-absorbing device, and the elastic shock-absorbing device is movably connected to the lower bottom of the inclined rear foot rod. 2. A wheelchair caster shock-absorbing device according to claim 1, characterized in that: the elastic shock-absorbing device includes an elastic element fixing component and an elastic reset element; the inner section of the caster shaft core assembly is fixedly connected with the elastic element fixing component; the elastic element fixing component is fixedly connected to one end of the elastic reset element; the elastic element fixing component is movably connected to the lower bottom part of the inclined rear foot rod; the other end of the elastic reset element is fixedly connected to the lower bottom part of the inclined rear foot rod, and the bottom part of the inclined rear foot rod presses the elastic reset element. 3. A wheelchair caster shock-absorbing device according to claim 2, characterized in that: the elastic element fixing component is a metal shell, the inner section of the caster shaft core assembly is fixedly connected to the lower section of the metal shell; the upper section of the metal shell is movably connected to the lower bottom of the inclined rear foot rod; an elastic element groove is opened inside the metal shell, the elastic reset element is longitudinally arranged, the elastic reset element is arranged in the elastic element groove, the upper end of the elastic reset element is fixedly connected to the lower bottom of the inclined rear foot rod, and the lower end of the elastic reset element is fixedly connected to the bottom of the groove. 4. A wheelchair caster shock-absorbing device according to claim 3, characterized in that: the elastic reset element is an elastic pressure spring; one end of the elastic pressure spring is fixedly connected to the elastic element fixing member, and the other end is fixedly connected to the lower bottom of the inclined rear foot rod. 5. A wheelchair caster shock-absorbing device according to claim 4, characterized in that: the lower bottom of the inclined rear foot rod protrudes downward and is connected to a spring positioning upper protrusion, and the spring positioning upper protrusion is inserted into the upper end spring hole of the elastic pressure spring; the bottom of the elastic element groove protrudes upward and is connected to a spring positioning lower protrusion, and the spring positioning lower protrusion is inserted into the lower end spring hole of the elastic pressure spring. 6. A wheelchair caster shock-absorbing device according to claim 3, characterized in that: a notch is provided at the upper top of the elastic element groove, the lower bottom of the inclined rear foot rod is inserted into the notch and clamped, and the upper section of the metal shell and the lower bottom of the inclined rear foot rod are jointly crossed by an upper screw assembly to be connected as a whole to prevent falling off. 7. A wheelchair caster shock-absorbing device according to claim 6, characterized in that: the lower metal shell of the upper screw assembly crosses the limit lower screw, the limit lower screw is located below the lower bottom part near the inclined rear foot rod, and the limit lower screw crosses the elastic element groove. 8. A wheelchair caster shock-absorbing device according to claim 2 or 3, characterized in that: the elastic reset element is a cylinder; the base of the cylinder is fixedly connected to the elastic element fixing component, and the telescopic rod of the cylinder is fixedly connected to the lower bottom of the inclined rear foot rod. 9. A wheelchair caster shock-absorbing device according to claim 1, 2 or 3, characterized in that: the caster shaft core assembly includes a caster shaft core screw and a nut assembly, the caster shaft core screw jointly crosses the middle of the elastic element fixing component and the rear caster, and the two ends are connected and fixed with a nut assembly and a nut to prevent falling off. 10. A wheelchair caster shock-absorbing device according to claim 1, 2 or 3, characterized in that the tire of the rear caster is made of elastic colloid material; and the inclined rear foot rod is made of a metal tube.