JPH068885Y2 - Casters with braking mechanism - Google Patents

Description

[Detailed Description of the Invention] The present invention is used by being attached to the lower end of furniture such as a chair as in the conventional case, and when the load on the furniture is large, the braking force on the wheels becomes small or disappears at all. The present invention relates to a caster having a structure in which a braking force is increased when a load is small.

Conventionally, casters attached to the lower end of furniture such as a chair on which a person is seated and the load of which changes, have a braking mechanism added thereto are already known, for example, Japanese Utility Model Publication No. Sho 55-21845. Is disclosed in. This is to apply a brake by engaging a brake pin with a recess provided in a wheel by operating a lever protruding to the outside of the caster cover with a finger or the like. Therefore, it is necessary to operate each time braking is applied, which is quite troublesome.

As a caster for solving this problem, as shown in FIG. 7, a mounting rod a is slidably mounted on a shaft support b, and one end interlocking with the mounting rod a has an upward spring c.
There is a brake body f which is elastically urged by and which has a braking portion e for the rolling surface of the wheel d at the other end and which is pivotally attached to the shaft support body b through a pin g at its center. However, this caster has a large number of parts, and has a complicated structure in which the braking body f is pivotally attached to the shaft support b through the pin g at the center thereof, which is an obstacle to cost reduction. Have. Further, since the braking portion e of the braking body f engages with the rolling surface of the wheel d, there is a problem that the rolling surface is damaged for a long period of time, which hinders smooth rolling of the wheel.

The present invention has been made to solve these problems, and an object thereof is to provide a caster having a simple braking mechanism having a structure that does not require operation of a lever or the like.

In order to achieve such an object, in the present invention, the axles 5 are provided at a pair of shaft centers on both sides of a shaft support 1 in which a pair of opposing walls 3, 3 are erected on both sides of a bottom wall having a required width. A wheel 7 that is provided in a protruding manner is provided, and the axle 5 is rotatable by protruding the tip side from the outside of both facing walls 3 and 3 to the shaft hole provided in the lower center of the facing walls 3 and 3. And a cover 9 that covers the pair of wheels 7 and the upper half of the wheel 7, and is attached to one side between the opposing walls 3 and 3 of the shaft support 1. The rod 13 has an upper mounting portion 14 penetrating the cover 9 so as to project upward, and is vertically slidable, and is elastically biased upward by a spring mounted on the mounting rod 13 and is formed from a plate body. One end of the braking body 17 is attached to the mounting rod 13 between the opposing walls 3 and 3, and the other end of the braking body 17 is formed as a free end and faces downward. Is bent Te, further by bending the tip arc-shaped cross section that is curved downward, both the opposite walls 3,
A braking portion 18 engageable from below is formed on the outer peripheral surface of the axle 5 of the wheel 7 between the three, and when the downward load on the mounting rod 13 is small, the braking portion 18 at the tip of the braking body 17 and the wheel 7 are formed. When the axle 5 is engaged and the frictional force generated between the two is large, and the downward load on the mounting rod 13 is large, the braking portion 18 at the tip of the braking body 17 and the wheel 7 are
The caster having the braking mechanism is characterized in that the engagement state between the axles 5 is released, and the frictional force generated between them is reduced or eliminated at all.

The details of the caster according to the present invention will be described with reference to the attached FIGS. 1 to 6. Reference numeral 1 denotes a pair of opposing walls 3 on both sides of a bottom wall 2 having a required width formed by bending a metal plate in a concave shape.
It is a shaft support body in which 3 is erected. Then, a cylindrical axle 5 is projected at the center of the shaft in a cylindrical bearing 4 projecting outward from the peripheral edge of a shaft hole provided in the substantially central lower portion of both opposing walls 3 and 3, An axle 5 of a wheel 7 having an annular projection 6 formed on the outer periphery on the 5 side is inserted with the tip end protruding inward from the outside of the opposing walls 3 and 3, and a pair of wheels 7 are provided on both sides of the shaft support 1. , 7 are rotatably supported. Reference numeral 8 denotes a metal shaft pin which is inserted between the axles 5 and 5 by inserting both ends into cylindrical axles 5 and 5 which face each other between the opposing walls 3 and 3. 9 is a pair of wheels 7 arranged on the upper side of the shaft support 1,
7 is a semi-cylindrical cover made of synthetic resin, which covers the upper half of 7. This involves engaging locking projections 12 and 12 projecting from the outer surfaces of both opposing walls 3 and 3 in a locking hole 11 provided in a mounting plate 10 projecting at intervals on the inner surface in the width direction. It is stopped and attached to the shaft support 1. Reference numeral 13 denotes a mounting rod which is provided on one side between the opposing walls 3 and 3 of the shaft support 1 so that a mounting portion 14 formed on a screw portion of the upper portion penetrates the cover 9 and projects upward.
This is because the large diameter portion 15 provided on the outer periphery of the upper portion of the cover 9 is locked to the upper portion of the cover 9 and the locking projection 16 provided at the lower end portion thereof.
Is locked and attached to the lower surface of the bottom wall 2 of the shaft support 1, and the distance between the large diameter portion 15 and the locking projection 16 is larger than the distance between the upper portion of the cover 9 and the lower surface of the bottom wall 2 of the shaft support 1. Then, it is slidable in the axial direction, that is, in the vertical direction.

Reference numeral 17 denotes a braking body bent in an approximately L shape, one end of which is inserted into the mounting rod 13 to be mounted, and the other end of which is bent downward so that the other end is bent downward, and the tip of the braking member is moved downward. A curved braking portion 18 is formed on the outer peripheral surface of the axle 5 of the wheel 7 between the opposing walls 3 and 3 so as to be engaged with the braking portion 18 from below. Numeral 19 is a step-like stopper provided almost at the center of the mounting rod 13, which determines the position of the braking body 17 and
17 can be moved up and down together with the mounting rod 13. The stopper 19 may be formed by inserting a pin into the mounting rod 13. Alternatively, as shown in FIG. 6, a groove is provided on the outer periphery of the mounting rod 13, and a bifurcated portion of a braking body 17 formed of a plate body is formed in the groove. The shaped ends may be engaged. Reference numeral 20 denotes a coil spring which is fitted over the mounting rod 13 and is interposed between the upper surface of the bottom wall 2 of the shaft support 1 and the lower surface of one end of the braking body 17, and the mounting rod 13 is moved upward together with the braking body 17 via a washer 21. Elastically biased. Then, when the mounting rod 13 is moving upward, the braking portion 18 at the tip of the braking body 17 is engaged with the outer peripheral surface of the axle 5 of the wheel 7 and pressed against it by the spring force. The locking projection 16 of the mounting rod 13 is C
A washer in the shape of a letter is inserted in the concave groove provided in the mounting rod 13, but this is done by caulking the end of the mounting rod 13 to a large diameter, or by inserting a stopper pin into the mounting rod 13. It can also be formed. Further, instead of the coil spring 20, it is also possible to use a leaf spring 22 bent in a U shape as shown in FIG. 6. In this embodiment, both ends of the leaf spring 22 are inserted into the mounting rod 13. Installed. Reference numeral 23 is an opening through which a braking portion 18 of a braking body 17 provided on the bottom wall 2 of the shaft support 1 passes.

Then, such casters are attached to a lower end portion of a chair or the like through a mounting portion 14 above the mounting rod 13 as in the conventional case, for example, in a required number. With this arrangement, when a person is not seated on the chair, the elastic forces of the springs of the plurality of casters overcome the weight of the chair and lift the mounting rod 13 upward, so that the mounting rod of the braking body 17 is mounted. Similarly, the one end on the 13 side is also lifted, and the braking portion 18 at the other end of the braking body 17 is moved upward, so that the braking portion 18 at the other end of the braking body 17 moves toward the axle 5 of the wheel 7 as shown in FIG. The outer peripheral surface is engaged with and pressed against the outer peripheral surface from below, and the rolling force of the wheel 7 is braked by the frictional force generated between the both, so that the chair cannot freely move. Then, when a person walking is hit by an unseated chair or something else, the chair is almost immovable. It is possible to prevent the chair from colliding with another object.

Also, when a person sits down on the chair, the weight of the person moves the braking body 17 together with the mounting rod 13 against the elasticity of the spring.
The braking portion 18 at the other end of the braking body 17 is separated from the axle 5 of the wheel 7 so that the wheel 7 can freely roll and the chair can be moved. That is, when a person sits on the chair, the braking of the wheels 7 by the braking body 17 is released, and the chair is free to move. When a person stands, the wheels 7 are braked and the chair cannot be moved. Therefore, for example, when the hips are lifted from the chair to pick up the handset or documents, the wheels 7 are braked. Therefore, even if the feet or the like hit the chair when the hips are lifted, the chair hardly moves. You can safely sit down when you hang it, you can prevent the chair from falling down due to careless movement, and you can always use the chair safely.

Further, the braking body 17 moves up and down together with the mounting rod 13 up and down, and since the braking body 17 does not need a shaft pin or the like, the number of parts can be reduced and the cost can be reduced. .

In the caster according to the present invention as described above, when the chair or the like is used, the mounting rod 13 moves up and down and the braking body 17 also moves up and down at the same time. Also, without complicated operations such as levers, the chair does not move carelessly, and when a person sits on the contrary, the braking of the wheels 7 is automatically released and the chair can be moved freely. The safety is high. Further, the load and release of the braking force on the wheel 7 is achieved by the braking body 17 provided on the mounting rod 13 to which the load is directly applied, so that the operation becomes reliable. Further, since the structure of the braking body 17 for applying the braking force is simple, an inexpensive caster can be provided without increasing the cost. In addition, the braking portion 18 of the braking body 17
Since it is not directly joined to the rolling surface of the wheel 7, there is no problem that the rolling surface is damaged in the long term and the smooth rolling of the wheel 7 is hindered. Further, there is little risk that sand, dust, and dust attached to the rolling surface of the wheel 7 will cause wear and malfunction of each part.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view showing a caster having a braking mechanism according to the present invention, FIG. 2 is a perspective view showing a shaft support, and FIG. 3 is a partial sectional side view showing the caster. Is a vertical cross-sectional view showing the mounting state of the shaft support body and the cover mounting plate,
FIG. 5 is a longitudinal sectional view showing a wheel, FIG. 6 is a partially sectional front view showing an essential part of another embodiment, and FIG. 7 is a longitudinal sectional front view showing a caster having a conventional braking mechanism. is there. 1: Shaft support, 2: Bottom wall, 3: Counter wall, 4: Bearing, 5: Axle, 6: Annular protrusion, 7: Wheel, 8: Shaft pin, 9: Cover, 10: Mounting plate, 11: Locking hole, 12: Locking projection, 13: Mounting rod, 14: Mounting part, 15: Large diameter part, 16: Locking projection, 17:
Braking body, 18: braking part, 19: stopper, 20: coil spring,
21: Washer, 22: Leaf spring, 23: Open.

Claims (1)

[Scope of utility model registration request] 1. A shaft supporting body (1) having a pair of opposing walls (3), (3) standing on both sides of a bottom wall (2) having a required width. The wheel (7) with the protruding (5) is installed, and the axle
Both (5) and (2) are opposite walls to the shaft hole provided in the lower center of the opposite wall (3)
(3), the tip side is projected from the outside to the inside of (3) to rotatably support the shaft, and the upper half of the pair of wheels (7) and (7) is covered by the shaft support (1). Cover (9) is attached and the shaft support
On one side between the opposing walls (3) and (3) of (1), a mounting rod (13) slides up and down by projecting an upper mounting part (14) of the mounting part (14) through a cover (9). Yes, this mounting rod (1
The braking body (17), which is elastically biased upward by a spring attached to (3) and is formed of a plate, has both opposing walls (3), (3).
Is attached to the mounting rod (13) in between, the other end of the braking body (17) is made into a free end and bent downward, and the tip is bent downward in a circular arc shape in section, Both opposing walls (3),
A braking part (18) that can be engaged from below is formed on the outer peripheral surface of the axle (5) of the wheel (7) between (3), and when the downward load on the mounting rod (13) is small, braking is performed. The braking part (18) at the tip of the body (17) and the axle (5) of the wheel (7) are engaged, the frictional force generated between them is large, and the downward load on the mounting rod (13) When the load on the wheel is large, the engagement between the braking part (18) at the tip of the braking body (17) and the axle (5) of the wheel (7) is released, and the frictional force generated between them is reduced. Or a caster having a braking mechanism characterized by the complete absence thereof.