JP2000279253A - Seismic isolator for storage furniture and the like - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily add a seismic isolator even to existing furniture or the like for two-dimensional base isolation of the furniture by reducing the vertical dimension of the device. SOLUTION: Rails 4 and 6 printing in mutually perpendicular directions and having recessed rail surfaces 9 are provided on both sides of the opposite faces of a lower baseplate 3 installed on a floor face or the like and an upper baseplate 5 on which storage furniture 2 is placed. Framed intermediate rails 7 and 8 provided between the rails 4 and 6 are provided with wheels 11 (11a) which roll along the rail surfaces 9 of the upper and lower rails 4 and 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to
The present invention relates to a seismic isolation device such as a storage fixture which can prevent a display case, a locker, a cabinet, furniture and the like from falling down.

[0002]

2. Description of the Related Art An example of this type of conventional seismic isolation device is disclosed in, for example, Japanese Patent Application Laid-Open No. Hei 10-94444.

[0003]

In the seismic isolation device according to the second aspect of the present invention, the floor is used for seismic isolation of furniture or the like in two-dimensional directions, for example, in the front-rear direction and the left-right direction. A lower support frame body mounted on a surface or the like, a first floating frame mounted thereon via rollers, an intermediate support frame provided above the first floating frame, and a A second floating frame described to be movable in a direction orthogonal to the first floating frame via a roller, and an upper support frame provided above the second floating frame and on which furniture and the like are placed. Equipped, the whole is 5 layers (5
Step) structure.

[0004] For this reason, there is a problem that the vertical dimension of the entire apparatus is inevitably increased, the height of furniture and the like is increased, and the apparatus cannot be retrofitted to the lower part of existing furniture and the like.

[0005] Further, since each member is a separate body, transportation is troublesome, and since it is necessary to assemble at a construction site, the work is complicated and much time is required for construction.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and the apparatus has a small vertical dimension, and can be easily retrofitted to existing furniture and the like, and can be seismically isolated in two dimensions. It is an object of the present invention to provide a seismic isolation device such as a storage fixture or the like, which is capable of being easily transported and constructed at a site as an integral structure.

[0007]

In order to achieve the above object, a seismic isolation device of the present invention comprises a lower base installed on a floor or the like, an upper base on which storage fixtures and the like are placed, and an upper and lower base. And a frame-shaped intermediate rail movably provided between the lower base and both sides of a surface of the lower base facing the intermediate rail, at least both sides of the upper end surface are substantially at the center in side view. At least one pair of lower rails having a concave rail surface having a downward maximum concave portion is provided,
Between the rail surface of each lower rail and the intermediate rail,
While providing wheels that roll in the longitudinal direction of the rail while being in contact with these opposing surfaces, on both sides of the upper base opposing surfaces to the intermediate rails, facing the direction orthogonal to the lower rail, At least one pair of upper rails each having a concave rail surface having a maximum concave portion upward at a substantially central portion in a side view at least on both sides,
Wheels are provided between the rail surface of each of the upper rails and the intermediate rail, and roll in the longitudinal direction of the rail while being in contact with these opposing surfaces. According to the present invention having the above-described structure, the two-dimensional structure is substantially realized in a three-layer (three-stage) structure of the rails provided on the upper and lower bases and the intermediate rail having wheels rolling along the rails. The seismic isolation effect in the direction is obtained. In addition, since the vertical dimension of the entire apparatus can be reduced, the height of furniture and the like does not increase, and the apparatus can be installed under existing furniture and the like without any trouble.

In the above seismic isolation device, the intermediate rail is formed so that the side facing the lower rail has a downward U-shape, and the side facing the upper rail also has an upward U-shape. It is preferable that the rotating shaft of each wheel housed so as to be rollable is supported by guide grooves extending in the longitudinal direction formed on both side pieces of the intermediate rail. In this way, the stepped wheels can be stably rolled by being guided by the intermediate rail, and the wheel can be prevented from coming off particularly when a pitching earthquake occurs.

In the above seismic isolation device, the length of the guide groove is
It is preferable that the length is substantially equal to or slightly smaller than the length of the concave rail surface. This prevents the wheels from separating from the concave rail surface.

In the above-described seismic isolation device, the wheels are stepped wheels consisting of a central small-diameter wheel and large-diameter wheels on both sides sandwiching the central-diameter wheel. It is preferable to contact the rail surface. By doing so, the amount of movement of the intermediate rail and the upper rail with which the large-diameter wheel contacts is larger than the amount of movement of the small-diameter wheel rolling on the rail surface, and the seismic isolation effect against an earthquake having a large amplitude is enhanced.

In the above seismic isolation device, means are provided between the lower rail and the intermediate rail and between the intermediate rail and the upper rail to prevent the wheels from rising from the lower rail and from lifting the upper rail from the wheels. Is preferred. In this way, even if a large-amplitude earthquake occurs and the wheels reach the stroke end, the storage fixtures and the like do not fall.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an exploded perspective view of the seismic isolation device 1 of the present invention, FIG. 2 is a front view thereof (hereinafter, the direction will be described with the direction of arrow A in FIG. 1 as the front), and FIG. FIG. 1 shows a right side view, in which a storage fixture 2 is fixedly mounted on a seismic isolation device 1.

The seismic isolation device 1 includes a pair of upward U-shaped lower rails 4 and 4 fixed to the left and right ends of the upper surface of a lower base plate 3 having a substantially square shape in a plan view. A pair of upper rails 7, 7 having the same shape as the lower race 4 and having a downward U-shape, fixed to front and rear ends of a lower surface of the base plate 5 in a direction perpendicular to the lower rails 4, and upper and lower rails 4. , 6, a pair of left and right intermediate lower rails 7, 7 and a pair of front and rear upper U-shaped intermediate upper rails 8, 8 are provided to face each other.

The outward upward piece 4a of the lower rail 4 is
A guide rail of a wheel 11 to be described later is formed, and two rail surfaces 9 are formed on the upper end surface by gently inclining the sides sandwiching the central portion into a downwardly concave arcuate shape having a lowermost portion at the central portion. Are formed.

Further, the outward downwardly directed piece 6 of the upper rail 6 is provided.
a also forms a guide rail of the wheel 11 described later, and a rail surface 9 similar to the above is formed on the lower end surface of the wheel 11 in an upside-down direction.

Reference numeral 10 denotes a reinforcing plate, which is fixed between opposing surfaces of the lower rails 4 and the upper rails 6 to increase their rigidity.

An upper end of the upward piece 4b inside the lower rail 4,
At the lower end of the downward piece 6b inside the upper rail 6, a guide piece 4c, which is bent outwardly and horizontally, to prevent falling,
6c are continuously provided.

The middle lower rails 7, 7 and the middle upper rails 8, 8 are fixed back to back at the front, rear, left and right ends, and are integrated in a rectangular frame shape.

The lower end of the downward piece 7a inside the middle lower rail 7 and the upper end of the upward piece 8a inside the middle upper rail 8 have:
The contact pieces 7b, 8b, which are accommodated in the U-shaped spaces of the lower rail 4 and the upper rail 6, respectively, and oppose the guide pieces 4c, 6c, are connected inwardly and horizontally.

In the U-shaped space between the intermediate lower rail 7 and the intermediate upper rail 8, large-diameter wheels 11a on both sides and small-diameter wheels 1 at the center are provided.
2b, two stepped wheels 11 are accommodated, and the two protruding ends of the rotating shaft 12 at the center thereof are located on both the lower pieces 7a and 7c of the intermediate lower rail 7 and the upper ends of the intermediate upper rail 8, respectively. The movable pieces 8a and 8c are movably supported in two guide grooves 13 formed in the longitudinal direction.

The outer peripheral surface of the large-diameter wheel 11a of each stepped wheel 11 is provided with a horizontal base 7 of the intermediate lower rail 7 and the intermediate upper rail 8.
The small-diameter wheels 11b are in contact with the respective rail surfaces 9 at d and 8d. Therefore, when the small-diameter wheel 11b moves while rolling along the rail surface 9, the intermediate lower rail 7 and the intermediate upper rail 8 that are in contact with the large-diameter wheel 11a move in the same direction as the moving direction of the stepped wheel 11. , Upper and lower rails 4, 6
And move relatively.

In this case, the intermediate lower rail 7 and the intermediate upper rail 8
The amount of relative movement with respect to the upper and lower rails 4 and 6 can be reduced by using the stepped wheels 11 having different large and small diameters.
Is considerably large with respect to the amount of movement rolling along the rail surface 9. As a result, the movement stroke of the intermediate lower rail 7 and the intermediate upper rail 8 can be made larger than the length of the rail surface 9.

The maximum movement amount of the intermediate lower rail 7 and the intermediate upper rail 8 (the relative movement amount with respect to the upper and lower rails 4 and 6) is regulated by the length of the guide groove 13, and the rotation shaft of the stepped wheel 11 is controlled. 1
It can reciprocate until 2 reaches both ends of the guide groove 13.

The length of the guide groove 13 is substantially equal to or slightly smaller than the length of the rail surface 9. Even when the rotating shaft 12 of the stepped wheel 11 moves to the end of the guide groove 13, the length of the guide groove 13 is small. The wheels 11b are located in the rail surface 9 and are prevented from being separated from both ends.

Next, the operation of the above embodiment will be described.

In a normal state other than when an earthquake occurs, since the load of the storage fixture 2 is applied to the seismic isolation device 1, the small-diameter wheels 11 b of the stepped wheels 11 that are in contact with the rail surfaces 9 of the upper rail 6. As shown in FIG. 2, the small-diameter wheel 11b of each stepped wheel 11 on each rail surface 9 of the lower rail 6 is located at the center of the rail surface 9 as shown in FIG. , Located at the center of the rail surface 9, the upper and lower base plates 3, 5, the intermediate lower rail 7 and the intermediate upper rail 8,
They are aligned vertically without protruding outside.

In this state, when a sway in the left-right direction (B and B 'directions in FIG. 1) occurs, as shown in FIG. 4, the lower base plate 3, the lower rail 4, the intermediate lower rail 7, and the intermediate lower rail The intermediate upper rail 8 fixed to 7 swings together with the floor surface.

However, the upper rail 6 mounted on the small-diameter wheel 11b of the stepped wheel 11 of the intermediate upper rail 8,
The upper base plate 5 fixed to the upper rail 6 is substantially stationary when the large-diameter wheels 11a roll on the intermediate upper rail 8 and the small-diameter wheels 11b roll left and right along the rail surface 9, respectively. Thus, the storage fixture 2 is seismically isolated and its fall is prevented.

When the earthquake subsides, the small-diameter wheels 11b of each stepped wheel 11 try to return to the center position on the rail surface 9.
The intermediate upper rail 8 automatically returns to the original position, and assumes the state shown in FIG.

On the other hand, when swinging in the front-rear direction (A and A 'directions in FIG. 1) occurs, as shown in FIG. 5, the lower space plate 3 and the lower rail 4 fixed thereto vibrate together with the floor surface. However, the small-diameter wheel 1 is attached to the rail surface 9 of the lower rail 4.
1b, and the stepped wheel 11 contacting the large-diameter wheel 11a with the intermediate lower rail 7 rolls in the front-rear direction along the rail surface 9 and the intermediate lower rail 7, thereby forming the intermediate lower rail. 7, the middle upper rail 8, the upper rail 6, and the upper base plate 5 are kept almost stationary,
Is prevented from falling in the front-rear direction.

When the vibration in the front-rear direction has stopped, as described above,
Since the small-diameter wheel 11b of each stepped wheel 11 attempts to return to the center position of the rail surface 9, the intermediate lower rail 7 and each member above the intermediate lower rail 7 automatically return to their original positions.

If the rotation shaft 12 of the stepped wheel 11 moves until it comes into contact with the front and rear ends of the guide groove 13 due to the occurrence of an earthquake having a large amplitude, the stepped wheel 11 rises from the rail surface 9, There is a risk that the storage fixture 2 will fall.

However, in the above embodiment, the guide piece 4c is provided on the lower rail 4 and the intermediate lower rail 7
Since the contact piece 7b is provided at the end of the intermediate lower rail 7 when the small-diameter wheel 11b of the stepped wheel 11 tries to float at the end of the rail surface 9 as shown in an enlarged view in FIG.
The contact piece 7b abuts on the guide piece 4c of the lower rail 4 to prevent its lifting and prevent the storage fixture 2 from tipping over.

This operation is the same even when the camera shakes largely in the left-right direction.

As described above, in the above embodiment, the small-diameter wheels 11b of the stepped wheels 11 having different large and small diameters are used.
Is rolled along the concave rail surface 9 so that the large-diameter wheel 11a is brought into contact with the intermediate rails 7 and 8 to roll, so that the intermediate rails 7 and 8 move with respect to the movement amount of the small-diameter wheel 11b. Since the moving stroke is large, the seismic isolation effect for an earthquake having a large amplitude is significantly large.

Further, since the conventional eccentric roller is not used, a pinion or a rack for guiding the roller is not required, so that the structure is simplified and the cost can be reduced.

Further, the seismic isolation device comprises upper and lower base plates 3,
The upper and lower rails 4 and 6 provided between the five rails and the intermediate rails 7 and 8 having four corners connected to each other have a three-layer structure, and each stepped wheel 11 has a U-shaped space between the intermediate rails 7 and 8. Since the apparatus is housed in the apparatus, the height of the entire apparatus can be reduced, and the apparatus can be easily retrofitted to existing tall storage equipment.

The upper and lower rails 4 and 6 fixed to the base plates 3 and 5 and the intermediate rails 7 and 8 abut the guide pieces 4c and 6c formed on the rails 4 and 6 and the intermediate rails 7 and 8. The engagement with the pieces 7b and 8b enables the vertical integration of the apparatus, so that the entire apparatus can be easily transported, installed on site, and constructed.

The present invention is not limited to the above embodiment.

As shown in FIG. 7, the shape of the stepped wheel 11 may be one large-diameter wheel 11a and one small-diameter wheel 11b. Their orientation may be opposite.

As shown in FIG. 8, the rail surface 9 of each of the lower rails 4 may be formed in a concave shape gradually and linearly inclined toward the center instead of the arc-shaped one. In the case of the upper rail 6, the upper rail may be turned upside down.

As shown in FIG. 9, a recess 9a is formed in the center of the rail surface 9 so as to be recessed slightly downward (the upper rail 6 is upward), and the small-diameter wheel 11b is normally positioned in the recess 9a. You may make it. In this way, even if an external force is applied to the storage fixture in a normal state, the storage fixture is prevented from swinging unnecessarily.

In the above embodiment, the intermediate rail 7,
Although the large-diameter wheel 11a of the stepped wheel 11 is brought into contact with 8, the intermediate rails 7 and 8 are omitted, and the large-diameter wheel 11a is brought into direct contact with the upper and lower base plates 3 and 5. It may be.

[0045]

According to the present invention, the following effects can be obtained.

(A) According to the first aspect of the present invention, the upper and lower rails provided on the upper and lower bases and the intermediate rail movably provided between the rails via wheels.
Despite the layer structure, a two-dimensional seismic isolation effect can be obtained. In addition, since the vertical dimension of the device is smaller than that of the conventional five-layer structure, the height of the storage fixture can be reduced, and it can be easily retrofitted to the lower part of the existing storage fixture or the like.

(B) According to the second aspect of the present invention, the stepped wheel can be stably rolled by being guided by the intermediate rail, and the wheel can be prevented from coming off particularly when a pitching earthquake occurs. You.

(C) According to the third aspect of the invention, the wheels are prevented from separating from the concave rail surface.

(D) According to the fourth aspect of the present invention, the amount of movement of the intermediate rail and the upper rail in contact with the large diameter wheel is greater than the amount of movement of the small diameter wheel rolling on the rail surface. In addition, the seismic isolation effect against large amplitude earthquakes increases.

(D) According to the fifth aspect of the invention, even if an earthquake having a large amplitude occurs and the wheels reach the stroke end, the stored furniture and the like do not fall. In addition, since the lower rail, the intermediate rail, and the upper rail are normally integrated via the means for preventing the lifting, the apparatus can be easily transported and the work at the installation site can be easily performed.

[0051]

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of the entire apparatus showing an embodiment of the present invention.

FIG. 2 is also a partially cutaway front view.

FIG. 3 is a partially cutaway right side view.

FIG. 4 is a front view when an earthquake occurs.

FIG. 5 is also a right side view when an earthquake occurs.

FIG. 6 is an enlarged front view of an essential part showing an operation at the time of overturn prevention.

FIG. 7 is a front view of a main part using another embodiment of a stepped wheel.

FIG. 8 is a side view showing another embodiment of the rail.

FIG. 9 is a side view of a main part showing another embodiment of the rail surface.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Seismic isolation device 2 Storage fixture 3 Lower base plate 4 Lower rail 4a, 4b Upward piece 4c, 6c Guide piece 5 Upper base plate 6 Upper rail 6a, 6b Upward piece 7 Middle lower rail 7a, 7c Lower piece 7b, 8b Contact piece 7d, 8d Horizontal base piece 8 Middle upper rail 9 Rail surface 9a Depression 10 Reinforcement plate 11 Stepped wheel 11a Large diameter wheel 11b Small diameter wheel 12 Rotating shaft 13 Guide groove

Claims (5)

[Claims] 1. A lower base installed on a floor or the like, an upper base on which storage fixtures and the like are placed, and a frame-shaped intermediate rail movably provided between the upper and lower bases,
On both sides of the surface facing the intermediate rail in the lower base, at least both sides of the upper end surface, the lower rail is a concave rail surface having a downward maximum concave portion in the substantially central portion in side view, at least A pair of wheels are provided between the rail surface of each lower rail and the intermediate rail, the wheels rolling in the longitudinal direction of the rail while being in contact with these opposing surfaces, while the upper base faces the intermediate rail. On both sides of the surface, face the direction orthogonal to the lower rail,
In addition, at least one pair of upper rails having at least both sides of a lower end surface having a concave rail surface having an upwardly largest concave portion substantially at the center in a side view is provided, and a rail surface of each upper rail and an intermediate rail are provided. A wheel that rolls in the longitudinal direction of the rail while being in contact with these opposed surfaces. 2. The intermediate rail is formed so that the side facing the lower rail has a downward U-shape and the side facing the upper rail has an upward U-shape, and can be rolled into the U-shaped space of the intermediate rail. The seismic isolation device of a storage fixture or the like according to claim 1, wherein the rotating shafts of the respective wheels accommodated in the housing are supported by guide grooves extending in the longitudinal direction formed on both side pieces of the intermediate rail. 3. The seismic isolation device for storage fixtures and the like according to claim 2, wherein the length of the guide groove is substantially equal to or slightly smaller than the length of the concave rail surface. 4. The wheel is a stepped wheel composed of a central small-diameter wheel and large-diameter wheels on both sides sandwiching the central wheel. The seismic isolation device of a storage fixture or the like according to claim 1, wherein the seismic isolation device is in contact. 5. A means for preventing lifting of the wheel from the lower rail and lifting of the upper rail from the wheel is provided between the lower rail and the intermediate rail, and between the intermediate rail and the upper rail. The seismic isolation device for storage fixtures and the like according to any one of the above items 4 to 4.