JPH11141610A - Base isolation device for caster-attached furniture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the overturning of furniture at the time of an earthquake, by releasing the constraint of the caster of the furniture by a simple mechanism. SOLUTION: A wearplate 3 for abutting on the respective facing side surfaces of casters 2, fitted to the fore and rear end parts of base legs extending in a lengthwise direction is made for rising and falling by hinges 4, and is provided on a floor surface. A supporting rod 7 having abutting surfaces 8a abutting on the wearplate 3 from the inner side, on both the end parts is connected to a connecting beam 10 for connecting right and left base legs by pulling springs 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seismic isolation device for furniture on casters, for example, a product display shelf.

[0002]

2. Description of the Related Art For example, in the case of a product display shelf equipped with casters, the product display shelf itself is prevented from falling over to a considerable extent by being moved by casters during an earthquake.

[0003]

However, simply attaching a caster requires only a small amount of external force or vibration.
Since the product display shelf may move, a brake means such as a lock is attached to the caster. However, if an earthquake occurs while the casters are locked, the merchandise display shelf will fall over, so it is necessary to release the lock during the earthquake. Conventional unlocking devices for this purpose generally have a complicated structure and are cumbersome to operate.

[0004] It is an object of the present invention to release casters of furniture with casters by a simple mechanism to prevent furniture from falling over during an earthquake.

[0005]

According to the present invention, the above-mentioned problem is solved as follows. (1) An abutment plate that contacts the opposite side surface of the caster attached to the front and rear ends of the base leg extending in the front-rear direction is provided on the floor surface so that it can be turned upside down, and the abutment surface that abuts both the abutment plates from inside. The supporting rods at both ends are connected to the connecting beam connecting the left and right base legs with a tension spring.

(2) In the above item (1), the concave and convex portions which complement each other are formed on the abutment plate and the contact surface of the support rod.

(3) In the above item (1) or (2), the center of the support rod is pivotally supported on a support shaft erected on the floor, and a pivot point of the support rod and one of the support rods are supported. The middle part with the end,
The extension beam is connected to the connection beam.

(4) In the above item (3), the stopper abutting on the outer edge in the middle between the pivot point of the support rod and the other end is provided.
Stand from the floor.

(5) In the above item (4), the upper portion of the stopper is a vertically movable rod having a biting portion engaged with a side portion of the support rod and urged downward.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A product display shelf (A) shown in FIG.
At the front and rear ends of the left and right base legs (1) extending in the front-rear direction,
A caster (2) is provided. In the seismic isolation device of the present invention, each caster (2) is normally locked at the installation position of the product display shelf (A), and this lock is released in the event of an earthquake.

A first example of the seismic isolation device of the present invention shown in FIGS.
In the embodiment of the present invention, an abutment plate (3) abutting on an opposing side surface of each caster (2) is attached to the base plate (5) by a hinge (4) so that the base plate (5) can be turned over. 6) is fixed to the floor surface (particularly, see FIG. 2). The base plate (5) may be simply placed on the floor. In this embodiment,
At the center of the opposing surface of each backing plate (3), a slightly arcuate convex portion (3a) pointing in the vertical direction is formed.

The opposite side surfaces of the front and rear backing plates (3) and (3) have outer surfaces of a downwardly bent portion (8) formed at the front end of the support rod (7) facing the front and rear direction, that is, abutment. The surface (8a) is in contact. The bent part (8) is formed as a whole with the convex part (3a) of the backing plate (3).
And a shallow concave arc that complements the shape.

An intermediate portion of the supporting rod (7) is connected to a connecting beam (10) connecting the left and right base legs (1) and (1) of the product display shelf by two coiled tension springs (9). It is connected to the provided mounting bracket (11). In this embodiment,
Although two tension springs (9) are provided, depending on the case, only one tension spring may be provided at the center of the support rod (7).

In the bottom view of FIG. 4, seismic force acts in the front-rear direction (to the left in this figure).
When the caster (2) moves slightly (to the left in FIG. 4), a slight slack occurs between the caster (2) and the abutment plate (3) in contact with the caster (2).

The support rod (7) moves in the direction of the connecting beam (10).
Since the tension plate (9) is always pulled by the tension spring (9), the looseness is caused by the convex portion (3a) of the backing plate (3) and the supporting rod which complements the convex portion (3a).
When it becomes large enough to disengage the abutment surface (8a) from the recess of (7), as shown by the imaginary line in FIG.
The rear end pivots inward about the front end, after which the front end also deviates inward from the front slat (3).

As described above, when one end of the support rod (7) and subsequently the other end move inward, the front and rear abutment plates (3) become
As they fall flat on the floor around the time, casters
(2) can move freely in the front-back direction.

In the second embodiment shown in FIGS. 5 and 6,
The base plate (5) with the front and rear backing plates (3) attached is a single plate
The plate (12) is mounted on the (12), and is placed on the floor.

At the upper end of a support shaft (13) erected at the center of the plate (12), the center of a support rod (7) is pivotally supported, and in the middle between this pivot point and one end, One end of the tension spring (9) is fixed, and the other end is also fixed to a fitting (11) fixed to the lower surface of the connecting beam (10).

A stopper (14) is provided on a plate (12) corresponding to an intermediate portion between the other end of the support rod (7) and the pivot point, the abutment against the outer edge of the support rod (7). Have been. Stopper (14)
Is a rod that can be moved up and down and is always spring-biased downward.
A biting portion (16) is formed at the upper part of the rod (15) so that the outer edge of the supporting rod (7) is engaged. It is to be noted that the stopper (14) can be omitted, and in this case, substantially the same operation and effect as in the first embodiment can be obtained.

With such a structure, the support rod
(7) is normally held in the normal position by contact with the stopper (15), but the support rod (7) is supported by the support shaft (13) during an earthquake.
When vibrating around the center, the biting part (16) and the support rod (7)
When the rod (15) is disengaged from the outer edge portion and the rod (15) is pulled downward, the support rod (7) rotates about the support shaft (13) and engages with the abutment plate (3). Is released, and the caster (2) can be made free as described above.

[0021]

According to the present invention, with a simple structure, the restraint of the casters can be released in the event of an earthquake, the furniture can be moved freely, and the furniture can be prevented from falling over or the articles on the shelf falling due to the earthquake. .

According to the second aspect of the invention, the engagement between the abutment plate and the abutment surface of the support rod is ensured, and the release action is unclear except in the case of a strong vibration such as an earthquake. You can prevent it from working.

According to the third aspect of the present invention, the support rod can be supported on the floor without floating, and its movement can be made smooth.

According to the fourth aspect of the present invention, the stop position of the support rod at all times can be defined.

According to the fifth aspect of the invention, it is possible to prevent the rod from descending unnecessarily, and to eliminate the possibility of malfunction.

[Brief description of the drawings]

FIG. 1 is a perspective view of a product display shelf provided with a first embodiment of a seismic isolation device of the present invention.

FIG. 2 is an enlarged exploded perspective view of the seismic isolation device at the lower left of FIG.

FIG. 3 is an enlarged side view of a product display shelf showing a seismic isolation device provided at a lower part of the product display shelf.

FIG. 4 is a bottom view of the product display shelf shown in FIG. 3;

FIG. 5 is an enlarged perspective view of a second embodiment of the seismic isolation device of the present invention.

FIG. 6 is an enlarged perspective view of a portion of the embodiment of FIG.

[Explanation of symbols]

 (A) Product display shelves (1) Base legs (2) Casters (3) Backing plate (3a) Convex part (4) Hinge (5) Base plate (6) Screw (7) Support rod (8) Bend part ( 8a) Contact surface (9) Tension spring (10) Lower connecting beam (11) Mounting bracket (12) Plate (13) Support shaft (14) Stopper (15) Rod (16) Biting part

Claims (5)

[Claims] An abutment plate which abuts on opposing side surfaces of a caster attached to front and rear ends of a base leg extending in the front and rear direction,
A support rod that is provided on the floor surface as being able to be tilted and has a contact surface at both ends that abuts both backing plates from inside is connected to a connection beam that connects the left and right base legs with a tension spring. Seismic isolation device for furniture with casters. 2. The seismic isolation device for caster-equipped furniture according to claim 1, wherein concave and convex portions forming complementary shapes are formed on the abutment plate and the contact surface of the support rod. 3. The center of the support rod is pivotally supported by a support shaft erected on the floor, and a pivot point of the support rod and an intermediate portion between one end of the support rod are connected by a tension spring. 3. The seismic isolation device for furniture with casters according to claim 1, which is connected to a beam. 4. A stopper which abuts on an outer edge intermediate between a pivot point of the support rod and the other end is provided upright from the floor surface.
A seismic isolation device for furniture with casters as described. 5. The seismic isolation device for furniture with casters according to claim 4, wherein the upper portion of the stopper is a vertically movable rod having a biting portion engaging with a side portion of the support rod and being urged downward. .