JP5127970B1 - Spring roller caster - Google Patents

Abstract

【Task】
The purpose of this model is to reduce the impact caused by road irregularities and bumps by shrinking and stretching the springs to reduce the change in resistance of the ground surface, and to carry with an easy carriage.
[Solution]
A spring roller 4 having a spring guide hole 19 provided radially between the outer ring 2 and the inner ring 7 and provided with a convex cam stop surface 20 at one end so that the convex spring receiving cam 8 does not pop out due to the extension of the spring. The object is to perform smooth running by absorbing impacts due to road surface irregularities and steps by contraction and extension of springs 11 to 18 provided in the rolling direction.
[Selection] Figure 6

Description

The present invention relates to a spring roller caster designed to soften the shock that the unevenness of the alley causes from the wheels to the cargo of the carriage via the casters and to smoothly run.

Conventional cart casters (see, for example, patent documents) suffer from shocks and vibrations caused by bumps and bumps in the alleys, and load collapses in the load and hands, causing damage to the load and impact noise, making it difficult to transport. It was.

JP 2008-143204 A JP 2005-96717 A

Since the conventional casters described above are not designed to reduce shock, the sound during running was high and the vibration transmitted to the hands was large.

  An object of the present invention is to solve the problems of conventional casters, and it is an object of the present invention to soften a shock caused by unevenness and a step of an alley and smoothly carry the cart.

In order to achieve the above object, the present invention provides the spring roller 4 with the spring guide holes 19 provided radially at equal intervals between the inner ring 7 provided with the bearing 3 and the outer ring 2.
The spring guide holes 19 are provided with springs 11 to 18 and spring receiving cams 8 respectively.

As shown in FIG. 6, when the outer ring 2 incorporated in the caster frame 1 hits the convex part G on the road surface while rolling, the springs 11, 12, and 18 receive the shock, contract the shock, reduce the noise, and vibrate to the load. The cargo will not collapse.

In FIG. 5, the stopper plate 5 stops at the stop surface 6 at the maximum load. Even at this time, the shrinkage allowance of the spring 11 remains.

In the case of a bicycle tire, if the air is reduced, the tire is dented and the resistance of the ground contact surface is increased.

Moreover, if the outer ring 2 is changed to a material having a cushion such as rubber, double shocks can be prevented in common with the spring, and smooth running can be performed.

Further, if it is configured as a swing caster, built in a bicycle axle, a caster for a baby carriage, a caster for a carry bag, a caster for a courier truck, etc., the utility value is wide.

FIG. 3 is an external view of a spring roller caster when no load is applied, in which a roller roller 3 and a spring roller 4 are incorporated in the caster frame 1. AA sectional drawing of FIG. 1 at the time of a spring roller no load. The BB sectional drawing of Drawing 2 at the time of a spring roller no load. Spring roller caster outline drawing at maximum load. FIG. 5 is a cross-sectional view taken along the line CC in FIG. 4 when the outer ring 2 of the spring roller rides on the convex part G of the road surface and the maximum load is applied. DD sectional drawing of FIG. 5 of the spring roller which got on the convex part G of a road surface. The expanded sectional view of the spring 12 part of FIG. The expanded sectional view of the spring 11 part of FIG.

The present invention relates to a spring roller capable of smoothly getting up obstacles and steps on a road surface.
Hereinafter, embodiments will be described with reference to FIGS.

FIG. 1 is an external view of the caster frame 1 in which the outer ring 2 spring roller 4 is assembled with the roller bearing 3 at no load, and the same springs 11 to 18 are formed by the convex spring receiving cam 8 and the inner ring 7 as shown in FIG. The outer ring 2 and the roller bearing 3 are concentric because they are held and incorporated in the caster frame 1 by the roller bearing 3 as shown in FIG.

FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1, and the spring roller 4 in the outer ring 2 rolls around the center of the roller bearing 3. The roller bearing 3 has a stopper plate 5 on both sides of the collar 9 spring roller 4 on both sides so that the inner ring 7 rotates concentrically. It is fixed to the frame 1 with a roller bearing nut 10. In order to match the radius of the contact surface between the inner ring 7 and the convex spring receiving cam, the inner ring 7 makes the concave round convex spring receiving cam 8 the convex round, and the inner ring 7 makes each convex spring receiving cam 8 concentric and easy to roll.

3 is a cross-sectional view taken along the line B-B of FIG. 2. One end of each of the spring-like springs 11 to 18 disposed in the spring guide hole 19 provided radially on the spring roller 4 is received by the inner surface of the outer ring 2 and the opposite end is a convex spring receiving cam. Since each spring receiving cam 8 held at 8 is in contact with the outer periphery of the inner ring 7, the roller bearing 3 and the outer ring 2 rotate concentrically.

FIG. 4 shows a state where the outer ring 2 of the spring roller collides with the convex portion G of the road surface, receives a maximum load, and the stopper plate 5 hits the stop surface 6. The difference between the position of the stopper plate 5 at the time of no load shown in FIG. 1 and the position where the stopper plate 5 of FIG. 4 hits the stop surface 6 is the operating difference (shrinkage allowance) of the springs 11-18.

FIG. 5 is a cross-sectional view taken along the line CC of FIG. 4. The spring roller 4 incorporated in one caster frame 1 receives the maximum load transmitted from the convex portion G of the road surface to the outer ring 2, the roller bearing 3, and the inner ring 7. The cam 8 pushes down the spring 11 and the front and rear springs 12 and 18. Stopper plates 5 on both sides of the spring roller 4 stop at stop surfaces 6. At that time, the spring 11 leaves a slight contraction allowance. The roller bearing 3 incorporated in the caster frame 1 moves up and down the both sides of the spring roller 4 together with the inner ring 7, the collar 9, the stopper plate 5, the roller bearing nut 10, and the caster frame 1. Further, since the outer diameter of the stopper plate 5 is larger than the inner diameter of the spring roller 4 even at the maximum load, entry of dust is prevented.

  The spring 15 opposite to the contracted spring 11 extends together with the convex spring receiving cam 8 and responds by changing the size (strength) of the spring to the magnitude of the load that does not stop and protrude at the convex spring receiving cam stop surface 20 of FIG. To do.

  In FIG. 6, the force receiving the maximum load in the DD section of FIG. 5 is transmitted to the roller bearing 3, the inner ring 7, and the convex spring receiving cam 8, and the spring 11 and the springs 12 and 18 on both sides are contracted to absorb the shock.

  Further, the springs 13 to 17 which are not subjected to shock are fully extended and stopped at the convex spring receiving cam stop surface 20 of FIG.

  Each of the convex spring receiving cams 8 and springs in the direction in which the inner ring 7 rotates is subjected to a load that repeatedly contracts and expands due to the size of the load and the convex portion of the road surface, and the cushion is stabilized because the load is always received by the center and the front and rear springs.

  FIG. 7 shows that when the inner ring 7 receives a load and starts to press the convex spring receiving cam 8, the spring whose inclination is pressed contracts, and the spring on the opposite side is transmitted to the spring relief surface 22 and the convex spring cam guide surface 23, and the spring guide. The hole 19 can be pushed down. The convex spring receiving cam 8 plays an important role when each of the springs is smoothly contracted and expanded.

  FIG. 8 is an enlarged view in which the convex spring receiving cam 8 receives the maximum load directly from the inner ring 7 and contracts the spring 11 to the maximum. At this time, the stopper plate 5 of FIG. State that left a little shrinkage.

  As described above, the present embodiment conveys the size of the load and the size of the convex portion of the road surface to the three springs in the direction in which the spring roller 4 rolls, and the hand that grips the cart while rolling and the shock to the load is reduced and smooth. Run.

  The spring guide hole 19 reciprocates between the convex spring receiving cam and the springs 11 to 18 so that if the oil is injected from the gap between the stopper plates 5, the movement is improved.

1. Caster frame Outer ring 3. 3. Roller bearing Spring roller 5. Stopper plate 6. Stop surface Inner ring 8. 8. Convex spring receiving cam Kara 10. Roller bearing nuts 11-18. Spring 19. Spring guide hole 20. Convex spring receiving cam stop surface 21. Convex spring receiving cam inner ring guiding surface 22. Convex spring receiving cam relief surface 23. Convex spring receiving cam spring guiding surface G . Projection on road surface

Claims (2)

A roller bearing fixed to the caster frame is provided with an outer ring that rolls, a spring roller that is inscribed in the outer ring is provided, a spring guide hole that is arranged radially is provided in the spring roller, and a spring and a spring are provided in the spring guide hole. A convex spring receiving cam stop surface is provided in order to prevent the convex spring receiving cam from protruding due to the extension of the spring at the inner diameter end of the spring guide hole. The convex spring receiving cam compresses a spring arranged radially by the pressure received from the inner ring in contact with the outer peripheral surface of the inner ring supported by the roller bearing, and the spring arranged in the spring guide hole The shock received from the convex part of the outer ring, the spring, the convex spring receiving cam, the inner ring, and the roller bearing are transmitted in this order. Spring roller caster characterized by a structure in which the pulling shrinks.
The stopper plate is supported by the roller bearing, and the stopper plate has an outer peripheral surface concentric with the roller bearing, and the spring roller is pressed against the roller bearing via the convex spring receiving cam. 2. A stop surface that abuts against the outer peripheral surface so as to leave a shrinkage margin in the spring that has shrunk.
The described spring roller caster.

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