JP3698189B2 - Seismic isolation device for furniture on casters - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a seismic isolation device for furniture with casters, such as a merchandise display shelf.
[0002]
[Prior art]
Generally, a caster in furniture with casters is provided with a stopper so as not to move normally.
[0003]
[Problems to be solved by the invention]
Since furniture such as the above-described furniture, such as a merchandise display shelf, is fixed and held by a stopper, when the floor surface is shaken violently due to an earthquake or the like, if the article on the shelf falls or is severe, the furniture itself You may fall.
If the stopper is released and the furniture can move freely with casters when an earthquake occurs, the energy of the earthquake can be absorbed.
However, since each of the four casters is usually provided with a stopper, the four stoppers must be released simultaneously in the event of an earthquake, and the mechanism for that must be complicated.
[0004]
In view of the above-described conventional problems, the present invention provides a seismic isolation device that locks furniture on the floor during normal times and automatically releases the lock during earthquakes without providing a stopper on the caster. The purpose is to provide.
[0005]
[Means for Solving the Problems]
According to the present invention, the above problem is solved as follows.
(1) An engagement / disengagement device having an engagement portion that is detachably engaged with the engaged portion is provided on a floor surface on which furniture having casters is located, and is provided at a lower portion of the furniture. An annular weight fitted with a margin to a locking shaft biased upward by a spring, and three attachment members fixed to the weight at equal intervals in the circumferential direction are respectively connected to a horizontal shaft. The hook is pivotally mounted and a flange is provided on the spring-biased locking shaft and is detachably locked by the hook, and detects the shaking such as an earthquake to A seismic canceling means for canceling the engaged state with the engaged portion is provided.
[0006]
(2) In the above item (1), the engaged portion is a concave hole formed in the floor-fixed substrate, and the engaging portion is formed in the engagement / disengagement device and is engaged with the concave hole. Is the axis.
[0007]
( 3 ) In the above item ( 2 ), the shaft is fitted to the engaging / disengaging device so as to surround the shaft fitted in the concave hole, and the hook is engaged above the pivot point to swing it. A cylindrical body having a brim that can be formed is provided.
[0008]
( 4 ) In any one of the above items (1) to ( 3 ), a plurality of engaged parts and a plurality of engagement / disengagement devices are provided.
[0009]
( 5 ) In any one of the above items (1) to ( 4 ), the vicinity of the engaged portion of the floor surface and the lower part of the furniture are connected by springs at a plurality of locations around the engaged portion, and the furniture is placed on the floor. It is elastically biased to a fixed position on the surface.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a perspective view of a commodity display shelf (A) provided with an embodiment of the seismic isolation device of the present invention.
Casters (2) are provided at the front and rear ends of the legs (1) extending in the front-rear direction at the left and right ends of the lower part of the product display shelf (A), and the floor (1) is in contact with the casters (2). The seismic isolation device of the present invention is disposed in a gap with the base part (3) provided immediately above.
[0011]
As shown in FIG. 2, the seismic isolation device is attached to a base plate (4) fixed to a floor surface, two bases (5) provided with a concave hole (11) as an engaged portion, and a product. From the two engaging / disengaging devices (7) provided with the locking shaft (12) which is fixed to the lower central connecting beam (6) of the display shelf (A) and can be fitted into the concave hole (11) of the base (5). It is configured.
[0012]
The substrate (4) is fixed to the floor surface with bolts (8).
One end of the coil spring (9) is attached to each of the four corners of the substrate (4), and the other end of the coil spring (9) is attached to the front and rear ends of the left and right legs (1) (10). Is attached.
[0013]
Next, the seismic canceling means incorporated in the engagement / disengagement device (7) will be described.
A cylindrical body (14) is erected by welding or the like at the lower center of the housing (13), and in the cylindrical body (14), a locking shaft extends through the upper and lower portions of the housing (13). (12) is housed. A compression coil spring (16) is provided between the flange (15) provided at the intermediate portion of the locking shaft (12) and the bottom plate (13a) of the housing (13) projecting inward of the cylindrical body (14). Is arranged.
[0014]
An annular weight (17) slightly above the bottom plate (13a) of the housing (13) provides a considerable margin (a) between the central opening (17a) and the cylindrical body (14). It is provided and fitted. On the upper surface of the weight (17), as shown in FIGS. 3 and 4, three mounting brackets (18) having an L-shaped longitudinal section facing in the radial direction are arranged at an angle of 120 degrees from each other. Yes.
[0015]
A vertical hook (19) with the upper collar (19a) facing inward is pivotally attached to the mounting bracket (18) by a horizontal shaft (20).
The weight (17), the hook (19), and the flange (15) are the main components of the seismic canceling means.
The hook (19) can be rotated around the horizontal axis (20), but as shown in FIG. 5, it is pressed toward the mounting member (18) by a weak leaf spring (21) from its side surface. It can be rotated only when a force against the force of the leaf spring (21) is applied.
[0016]
As shown in FIGS. 4 and 5, a notch (22) is formed above the horizontal shaft (20) at the centripetal edge of the mounting member (18), and a cylindrical body (14) is formed at a position corresponding to this. ) Has a circular collar (23) fixed thereto.
As will be described later, the brim (23) can enter the notch (22) and rotate the hook (19) when a shake such as an earthquake acts on the weight (17).
[0017]
A positioning stopper (24) of the hook (19) is formed on the upper part of the centripetal edge of the mounting member (18).
[0018]
As is clear from FIG. 4, the weight (17) and the mounting member (18) and hook (19) mounted thereon are integrated, but are separated from the housing (13), The hook portion (19a) of the hook (19) is hooked and held on the upper surface of the flange (15) of the locking shaft (12) biased upward by the coil spring (16).
[0019]
Reference numeral (25) is a weight stop of the weight (17) disposed above the weight (17) inside the housing (13).
[0020]
Next, the operation will be described.
Usually, at the installation position of the product display shelf shown in FIG. 1, the locking shaft (12) of the engagement / disengagement device (7) fixed to the lower connection beam (6) of the product display shelf is fixed to the floor surface. As shown in FIG. 4, the hook (19) is hooked on the flange (15) and the locking shaft (12) is engaged with the base plate (4) in the state of being inserted into the concave hole (11). It has stopped.
[0021]
When intense shaking such as an earthquake is input from the floor surface, the weight (17) floatingly supported by the hook (19) is moved into the housing (13).
When the moving direction of the weight (17) is, for example, a direction from the center toward one hook (19) (left side in FIG. 4), the mounting member (18) mounted on the weight (17) The hook (19) pivotally attached moves away from the locking shaft (12), precisely the cylindrical body (16) provided around it, and moves to the imaginary line position, and the hook (19a) at the tip thereof Is disengaged from the flange (15) of the locking shaft (12).
At this time, the two hooks (19) on the opposite side approach the locking shaft (12), and thus the cylindrical body (16), and the collar (23) enters the notch (22) of the mounting member (18), The hook (19) is pushed above the pivot point (horizontal axis (20)), and the hook (19) rotates outwardly as shown on the right side of FIG. Remove from 12) flange (15).
When this happens, the locking shaft (12) jumps up to the position of the imaginary line by the force of the compression coil spring (16), escapes from the recessed hole (11) of the base (5), and the merchandise display shelf (A) is on the floor. Separated from the face.
[0022]
However, since the four ends of the leg (1) of the product display shelf (A) are connected to the four corners of the substrate (4) fixed to the floor surface via the coil spring (9), the seismic force The movement of the merchandise display shelf (A) due to the shaking of the coil is attenuated by the elastic force of the coil spring (9), the range of movement is limited, and it converges to the original position as the earthquake stops. .
[0023]
At least two engagement / disengagement devices (5) are provided to prevent rotation about the engagement shaft (12), but the engagement shaft (12) has a square or rectangular cross section. If so, it may be one.
Further, the structure of the engagement / disengagement device or the mechanism of the seismic canceling means is not limited to the above-described one, and any appropriate one can be used as long as the same effect can be obtained.
[0024]
【The invention's effect】
When Ru good to the invention of claim 1, wherein, when the floor shook vigorously by an earthquake or the like, to release the fixing for the floor furniture casters, so to be able to move it, articles placed on furniture Can be effectively prevented from falling, furniture falling, and the like.
In addition, the seismic release means has an annular weight fitted with a margin to a locking shaft biased upward by a spring, and three attachments fixed to the weight at equal intervals in the circumferential direction. Each of the members is composed of a hook pivotally attached to each member by a horizontal shaft, and a flange that is provided on the spring-biased shaft and is detachably locked by the hook. The hook can be easily detached from the flange to move the locking shaft upward and released from the floor surface.
[0025]
According to the second aspect of the present invention, the engaged portion is a concave hole formed in the floor-fixed substrate, and the engaging portion is formed in the engagement / disengagement device and can be fitted into the concave hole. since an axis, it is possible to perform disengagement easily easily in the vertical direction.
[0026]
According to the third aspect of the present invention , the collar that surrounds the locking shaft that fits into the recessed hole, is fixed to the engagement / disengagement device, and can be engaged with the hook above the pivot point to swing the collar. Therefore, the hook closer to the cylindrical body at the time of an earthquake can be easily detached from the flange of the locking shaft.
[0027]
According to a fourth aspect of the present invention, since is provided a plurality of engaged portions and detachment apparatus, furniture can be prevented from rotating about the axis.
[0028]
According to the fifth aspect of the present invention , the vicinity of the engaged portion of the floor surface and the lower part of the furniture are connected by the springs at a plurality of locations around the engaged portion, and the furniture is elastically placed at a fixed position on the floor surface. Because it is energized, the seismic force against the furniture separated from the floor surface by the input of seismic force can be elastically offset, and the range of furniture movement can be elastically restricted to enhance the seismic isolation effect .
[Brief description of the drawings]
FIG. 1 is a perspective view of a product display shelf provided with an embodiment of the seismic isolation device of the present invention.
FIG. 2 is an exploded perspective view of a main part of the seismic isolation device of the present invention and a part of a lower part of a commodity display shelf.
FIG. 3 is an enlarged cross-sectional view of the seismic isolation device engaging / disengaging device of the present invention.
4 is a cross-sectional view taken along line IV-IV in FIG.
FIG. 5 is an enlarged exploded perspective view of a hook, a mounting member, and a leaf spring.
[Explanation of symbols]
(A) Product display shelf
(1) Leg
(2) Caster
(3) Stand
(4) Board
(5) Base
(6) Lower connection beam
(7) Engagement / detachment device
(8) Bolt
(9) Coil spring
(10) Mounting bracket
(11) Recessed hole
(12) Locking shaft
(13) Housing
(13a) Bottom plate
(14) Cylindrical body
(15) Flange
(16) Compression coil spring
(17) Weight
(17a) Opening
(18) Mounting member
(19) Hook
(19a) Buttocks
(20) Horizontal axis
(21) Leaf spring
(22) Notch
(23) Brim
(24) Positioning stopper
(25) Dancing stop

Claims (5)

An engaged portion is provided on the floor surface on which the furniture having casters is located, and an engaging / disengaging device having an engaging portion that is detachably engaged with the engaged portion is provided at the lower portion of the furniture, and by a spring An annular weight fitted with a margin to a locking shaft biased upward, and three attachment members fixed to the weight at equal intervals in the circumferential direction are pivotally attached to the weight. And a flange provided on the spring-biased locking shaft and detachably locked by the hook, and detects the shaking such as an earthquake to disengage the engaging portion from the engaged portion. A seismic isolation device for furniture with casters, characterized in that a seismic canceling means for canceling the engaged state with the joint is provided .   2. The caster according to claim 1, wherein the engaged portion is a concave hole formed in the substrate fixed to the floor surface, and the engaging portion is a locking shaft formed in the engagement / disengagement device and fitted into the concave hole. Furniture seismic isolation device. Surrounding the shaft that fits into the concave hole is fixed to the engagement / disengagement device, and the hook is provided with a cylindrical body having a collar that can be engaged with and swung above the pivot point. The seismic isolation device for furniture with casters according to claim 2 . The seismic isolation device for furniture with casters according to any one of claims 1 to 3 , wherein a plurality of engaged portions and a plurality of engagement / disengagement devices are provided. And the engaged portion and around the furniture bottom of the floor, the connecting by the spring at a plurality of locations around the engaged parts, furniture according to claim 1-4 which is resiliently biased into position on the floor A seismic isolation device for furniture with a caster according to any one of the above.

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