JPH08216606A - Castor - Google Patents

Abstract

PURPOSE: To provide a castor which is attached to a chair, fixes the chair when a person is seated on it so that it does not move, can move the chair freely in every direction when a person is not seated on it, and can apply brake securely without damaging a wheel. CONSTITUTION: A roller shaft 7 which supports a wheel 6 can move vertically for a case 5. The wheel 6 is energized downwards and elastically by an elastic body 10 to hold it in a condition in which a part of the wheel 6 protrudes from the case 5. A brake member 9 is provided at a position where it comes into contact with a floor surface when the case 5 is pressed downwards for the wheel 6 by applying load.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a caster mounted on furniture such as a chair and a wagon table. More specifically, the caster is mounted on a chair and fixed so that the chair does not move when sitting, and the chair is easy when not sitting. And a caster that can move in any direction.

[0002]

2. Description of the Related Art Conventionally, for example, as a caster to be attached to a chair, there is one disclosed in Japanese Utility Model Publication No. 51-35742. Specifically, a support body on a fork of a wheel supports a lid-like body via a spring. Attach the pendant to the lid and face the tire so that its side surface is separated from the tire, and the upper part of the lid and the load body slide around the central axis at a position away from the vertical axis of the car center. Some are rotatable. Then, when sitting on a chair, the wheel is pushed upward by weight and the lower surface of the pendant is pressed against the tire of the wheel at two points on both sides of the fork, and the wheel is held in a non-rotatable state due to the friction. To be done.

[0003]

However, in the conventional caster, the tire of the wheel is pressed against the forks at two positions on both sides of the fork due to the weight of the caster when it is seated on the chair, so that the wheel is damaged or rotated. You just need to put the forks on both sides of the fork on the two easy wheels, and brake.
There is a problem that the stopped state cannot be maintained completely.

Therefore, according to the present invention, for example, the chair is attached to a chair so that the chair is fixed so that it does not move when sitting, and the chair can be freely moved in any direction when not sitting, and the wheels are not damaged. The aim is to provide casters that can reliably brake.

[0005]

In order to achieve the above object, a roller shaft that pivotally supports a wheel can be moved up and down with respect to a case, and an elastic body elastically urges the wheel downward. It is characterized in that a brake member is provided at a position where a part of the wheel is held in a protruding state, a load is applied to push the case downward with respect to the wheel, and the wheel contacts the floor surface.

Further, a roller shaft having wheels at both ends is positioned in guide openings formed in both side walls so as to project from both sides of the case opened downward, and is movable up and down. An elastic body provided in the case. Alternatively, the wheel may be elastically urged downward, and a part of the wheel may be held in a protruding state by the restricting member.

Further, it is preferable that a brake member is provided at the lower end of the main shaft supported by being eccentric from the position of the wheel.

It is more preferable to use a soft member for the brake member.

[0009]

As described above, according to the caster of the first aspect of the present invention, for example, the caster is attached to a leg of a chair,
When not seated, the wheel can be held in a state of being projected from the brake member by the urging force of the elastic body, and the chair can be moved in this state. Further, when the user sits down, a load is applied, and the case is pushed against the wheel against the biasing force of the elastic body, and the chair is fixed so that the brake member does not come into contact with the floor surface and move.

According to the caster of the second aspect, it is possible to move the casters by means of wheels which are projected on both sides of the case and arranged in parallel.

According to the caster of the third aspect, when seated, a load is applied, the case is pushed against the wheel against the biasing force of the elastic body, and the brake member provided at the lower end of the main shaft is placed on the floor. The chair is fixed so that it does not move when it abuts.

According to the caster of the fourth aspect, the brake member using a soft member such as silicon rubber comes into contact with the floor surface.

[0013]

The details of the present invention will be described with reference to the embodiments shown in the drawings. A typical caster 1 according to the present invention is attached to a supporting leg 4 of a leg portion 3 of a chair 2 as shown in FIG. 1, for example. It can also be used by attaching it to furniture such as a wagon table.

As shown in FIG. 5, the caster 1 is mainly composed of a case 5, a roller shaft 7 pivotally supporting a pair of wheels 6, 6, a main shaft 8, a brake member 9, an elastic body 10, and a support frame 11. ing.

The case 5 is, as shown in FIGS. 2 to 5,
A case main body 13 that is open downward is extended to the side of a support cylinder 12 that supports the main shaft 8, and both side walls 13 of the case main body 13 are extended.
Guide holes 15 and 15 are formed halfway upward from the lower end of the substantially central portion of a and 13a, and the pivot pin 16 and the regulation pin 17 are press-fitted and fixed to both sides of the guide ports 15 and 15 to penetrate. Holes 18, 18,
The mounting holes 19 and 19 are provided.

The support frame 11 has a U-shaped member which is open upward and is large enough to be housed in the case body 13 of the case 5. The holes 20 and 20 are formed, and the through holes 21 and 21 through which the roller shaft 7 is inserted are formed in the front. The front portions of the side walls 11a and 11a are cut out from the lower end to the middle and the locking portions 22 and 22 are formed. It was done.

As shown in FIG. 5, the roller shaft 7 is set to have a length projecting from both sides of the case body 13 of the case 5, and is provided with a concave groove 23 into which the wheel 6 is loosely fitted.

As shown in FIG. 5, the elastic body 10 has a coil portion 24 having a size that can be wound around the roller shaft 7 from both ends L
Kick springs are used, with the letter-shaped pieces 25, 25 extending forward.

As shown in FIGS. 2 and 5, the main shaft 8 has a diameter that can be inserted into the support hole 26 of the support cylinder 12 of the case 5,
The collar portion 27 is provided in the middle of the upper portion, and the screw portion 28 is provided in the upper and lower portions.

As shown in FIGS. 2 and 5, the brake member 9 is opened upward so as to have a reduced diameter portion 30 which can be fitted in a recess 29 at the lower end of the support cylinder 12 of the case 5. A step 31 is provided in the middle of the cylinder, and a plurality of non-slip ridges are provided on the bottom surface.
32 is provided, and is wholly integrally molded with a soft member such as silicon rubber or rubber, or a synthetic resin such as polyethylene, polypropylene, polyurethane, or nylon.

To assemble the caster 1, the main shaft 8 is inserted into the support hole 26 of the support cylinder 12 in the case 5 until the flange 27 contacts the upper end of the support cylinder 12, and the washer 33 is attached to the screw portion 28 below the main shaft 8. The nut 5 is screwed through the case 5 so that the case 5 is rotatable with respect to the main shaft 8 and the reduced diameter portion 30 of the brake member 9 using a soft member is fitted in the recess 29 at the lower end of the support cylinder 12. As a result, the brake member 9 is attached to the case 5.
And further through holes 2 formed in both side walls 11a, 11a.
The roller shaft 7 is inserted into the rollers 1 and 21, the wheels 6 are loosely fitted to both ends of the roller shaft 7, and then housed in the case body 13, and the roller shaft 7 is positioned in the guide ports 15 and 15 of the case body 13. Let the elastic body
The pivot pin 16 wound with the coil portion 20 of 10 is attached to the side wall of the case 5.
The support frame 11 is rotatable by being press-fitted into the through holes 18, 18 of 13a, 13a, and the bullet piece 25 above the elastic body 10 is brought into contact with the inner surface of the case body 13, and the bullet piece 25 below is supported by the support frame 11. The connecting pin 11b is urged by contacting the connecting piece 11b of
As shown in FIG. 2, the press-fitting of 17 causes the engaging portions 22, 22 of the support frame 11 elastically biased in the forward tilting direction to come into contact with the regulation pin 17 and the wheels 6, 6 to the brake member 9. It can be held in a more protruded state.

In the caster 1 described above, the case 5
To hold the wheels 6 and 6 in a protruding state,
A restricting member 35 that locks the restricting pins 17 to the engaging portions 22 of the support frame 11 is used. As the restricting member 35, a protrusion is provided in the case body 13 so that the proper position of the support frame 11 is hit. It may be one that is brought into contact with them. Although the kick spring is used in the elastic body 10 in the illustrated example, the support frame 11 may be elastically biased downward using a Kolui spring, a leaf spring, rubber or the like. In the caster 1 described above, the wheels 6 and 6 are located outside the case 5, but the case 5
The structure may be located inside the. Further, it is preferable that the position of the brake member 9 is provided at the lower end of the main shaft 8 that is eccentrically supported from the positions of the wheels 6 and 6 because the main shaft 8 that supports the chair 2 can be dropped and the brake can be directly applied. It is also possible to provide it at the peripheral end of the case 5 which is deviated from the main shaft 8 or inside the case 5.

According to the caster 1 of this embodiment, as shown in FIG. 1, the upper screw portion 28 of the main shaft 8 is used to attach to the supporting leg 4 of the leg portion 3 of the chair 2, for example, when the user does not sit down. As shown in FIG. 2, a state in which the locking portions 22, 22 of the support frame 11 are abutted against the regulation pin 17 by the urging force of the kick spring which is the elastic body 10 and the wheels 6, 6 are projected from the brake member 9. By moving the chair 2 in this state, the entire case 5 rotates with respect to the main shaft 8 and the wheels 6 and 6 respectively rotate, so that the chair 2 can be moved in all directions. Can be made. Further, when seated, as shown in FIG. 3, a load is applied, the case 5 is pushed against the wheels 6, 6 against the biasing force of the elastic body 10, and the brake member 9 provided at the lower end of the main shaft 8 is The chair 2 is fixed so as not to move while coming into contact with the floor surface. Further, when leaving the seat, the entire case 5 is lifted up by the urging force of the elastic body 10 with respect to the wheels 6 and 6, and the brake member 9 returns to the movable state by leaving the floor surface.

As described above, according to the caster 1 of this embodiment, when the seat 5 is seated and a load is applied, the case 5 is pushed downward with respect to the wheels 6 and 6 so that the brake member 9 is brought into direct contact with the floor surface. The wheels can be firmly braked without damaging the wheels 6 and 6. Furthermore, since the caster 1 is provided with the pair of wheels 6 and 6 outside the case 5, traveling is stable and
Even when the brake member 9 is dropped by applying a load, the brake member 9 can be stably and reliably carried out. Moreover, the brake member 9 provided at the lower end of the main shaft 8 is dropped straight and brought into contact with the floor surface. And in addition,
By using a soft member such as silicon rubber for the brake member 9, the frictional force with the floor surface can be increased, so that the brake member 9 can be more firmly fixed.

[0025]

Since the present invention is configured as described above, it has the following effects. According to the caster of claim 1, when the seat is seated and a load is applied, the case is pushed downward with respect to the wheel, so that the brake member is directly brought into contact with and fixed to the floor surface, so that the wheel is not damaged. You can brake firmly.

According to the caster of the second aspect, since the pair of wheels is provided outside the case, the traveling is stable, and when the load is applied and the brake member is dropped, the caster can be stably and reliably performed. You can

According to the caster of the third aspect, the brake member provided at the lower end of the main shaft is dropped straight and brought into contact with the floor surface, so that the brake can be applied firmly.

According to the caster of the fourth aspect, since the soft member such as silicon rubber is used for the brake member, the frictional force with the floor surface can be increased, and the caster can be more firmly fixed. .

[Brief description of drawings]

FIG. 1 is a perspective view of a chair equipped with casters of a representative embodiment according to the present invention.

FIG. 2 is an enlarged vertical cross-sectional view of the caster before sitting.

FIG. 3 is an enlarged vertical cross-sectional view of the caster after sitting.

FIG. 4 is a sectional view taken along line AA of FIG.

FIG. 5 is an exploded perspective view of a caster

[Explanation of symbols]

1 caster 2 chair 3 leg part 4 support leg 5 case 6 wheel 7 roller shaft 8 main shaft 9 brake member 10 elastic body 11 support frame 12 support cylinder 13 case body 15 guide port 16 pivot pin 17 regulation pin 18 through hole 19 mounting hole 20 Through hole 21 Through hole 22 Locking part 23 Recessed groove 24 Coil part 25 Bullet piece 26 Support hole 27 Collar part 28 Screw part 29 Recessed part 30 Reduced diameter part 31 Step part 32 Non-slip ridge 33 Washer 34 Nut 35 Restricting member

Claims (4)

[Claims] 1. A roller shaft pivotally supporting a wheel is movable up and down with respect to a case, an elastic body elastically biases the wheel downward, and a state in which a part of the wheel projects from the case is held. A caster characterized in that a brake member is provided at a position where a load is applied to push the case downward with respect to the wheel and contact the floor surface. 2. An elastic body provided in a case, wherein roller shafts having wheels at both ends are positioned in guide openings formed in both side walls so as to project from both sides of a case opened downward, and are vertically movable. While elastically biasing the wheel downwards at,
The caster according to claim 1, wherein a part of the wheel is held in a protruding state by the restricting member. 3. The caster according to claim 2, wherein a brake member is provided at a lower end of a main shaft provided eccentrically from the position of the wheel. 4. The caster according to claim 3, wherein a soft member is used as the brake member.