JP2023100508A - Base isolation device capable of being worn with single operation - Google Patents

Abstract

To provide a base isolation device that is attached to an existing lighting fixture or the like hung from a ceiling with a single operation, without the need for work such as fixing it to the ceiling with screws or metal fittings, and can suppress shaking caused by an earthquake and prevent damage such as falling or breaking.SOLUTION: A base isolation device is mainly composed of guard rods, a holder, and a magic band. The guard rods 1, 2 are inserted into the holder 3 so that they can rotate horizontally, the holder is wrapped around a cord 5a of an existing lighting fixture 5 or the like using the magic band 4, and when swaying occurs due to an earthquake or the like, the tip parts of the guard rods 1, 2 come into contact with a ceiling to constrain the movement of the cord 5a, thereby preventing the lighting fixture 5 or the like from swaying significantly.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to a seismic isolation device and equipment for suppressing shaking caused by an earthquake and preventing damage such as falling or breaking of objects hung from the ceiling.

In Japan, since ancient times, earthquakes have caused great damage to people, buildings, household goods, equipment, etc., and many seismic dampers, seismic isolation devices and equipment have been developed to protect them from shaking. It's here.

There are many seismic isolation devices and fixtures that protect lights and other fixtures hanging from the ceiling from shaking, and they include ropes and chains that are stretched diagonally from the ceiling, seismic isolation rubbers, springs, and devices that slide horizontally. When installing them, it was necessary to fix them to the ceiling using screws, metal fittings, or the like.

As a countermeasure against earthquakes, in Japanese Patent Application No. 2021-166542, we proposed a seismic isolation device that stretches a rope between the upper and lower frames and makes the guide stand contact the rope to restrain the movement and suppress the shaking. Also in the case of , the upper frame must be fixed to the ceiling using screws, metal fittings, etc., and there is also a disadvantage that the height of the device lowers the position of the object to be hung.

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The problem to be solved is that it can be easily attached to existing lighting fixtures that are hung from the ceiling with one touch, without the need for work such as fixing it to the ceiling with screws or metal fittings. To provide a seismic isolation device capable of preventing damage caused by earthquakes.

The seismic isolation device of the present invention has a guard rod, a holder, a magic band, etc. as main components, and the guard rod is inserted into the holder so that it can rotate in the horizontal direction. By wrapping it around the cords or chains of the hanging lighting, etc., when shaking occurs due to an earthquake, etc., the tip of the guard rod contacts the ceiling and restricts the movement of the cords and chains, preventing the lighting from swinging significantly. I made a structure like

The effect of the seismic isolation device of the present invention is that it can be easily attached to the existing lighting, etc. suspended from the ceiling with one touch without the need for work such as fixing it to the ceiling with screws or metal fittings, suppressing shaking due to an earthquake and falling down. There is an advantage that it can prevent damage such as breaking or breaking.

A side view showing an embodiment of this seismic isolation device Plan view seen from the ceiling side of Fig. 1 Side view showing the lighting swinging to the west (W) side Side view showing the tip of the upper guard rod in contact with the ceiling Side view showing the state where the tip of the lower guard rod is also in contact with the ceiling A side view showing a state in which the coil portion of the lower guard rod is twisted and bent. Side view showing the state where the tip and the holder are displaced sideways The side view which showed the Example which combined the guard rod, the holder, etc.

FIG. 1 shows an example of an embodiment of the present invention.
The overall structure consists of an upper guard rod 1 that first contacts the ceiling 6 when rocking occurs, a lower guard rod 2 that contacts the ceiling 6 a little later, and these rods are inserted into holes so that they can rotate horizontally. It is roughly divided into two holders 3, upper and lower, and two magic bands 4 for winding the holder 3 around the cord 5a from which the existing lighting 5 is suspended.

The upper guard rod 1 is made of a wire or the like with a diameter of about 3 to 4 mm, and a rubber 1a is wrapped around the tip bent in the horizontal direction so that this part does not slip easily when it comes into contact with the ceiling. .

The lower guard rod 2 is also made of the same wire or the like as the upper one, and has a joint part 2a in the middle that can freely swing in the vertical direction, and a coil part 2b that twists and bends in the vertical direction at the tip side. The tip part is folded back and hooked on the upper guard rod 1. - 特許庁

Two upper and lower holders 3 made of metal, plastic, or the like are provided with holes so that the upper and lower guard rods 1 and 2 can be inserted and rotated 180 degrees in the horizontal direction. 2 is opened at a slight angle from the vertical so that it faces the direction of the intermediate position where it can always be rotated normally.

The two magic bands 4 are adhered to the upper and lower holders 3, respectively, so that they can be wound around the cord 5a of an existing lighting or the like with one touch.

FIG. 1 shows the normal state when the light is attached to an existing lighting or the like, and FIGS.

Fig. 2 is a plan view of Fig. 1 viewed from the ceiling side. It is shown installed on the east (E) side of the

FIG. 3 shows a state in which a strong earthquake first shook the building to the east (E) side, and the lighting 5 suspended from the ceiling 6 tilted to the west (W) side.
At this time, the light 5 tilts greatly to the west (W) side in the same way as in a normal swinging manner with P1 at the root of the cord 5a as a fulcrum and L1 as a swing radius.

FIG. 4 shows a state in which the light 5 is about to swing back to the opposite east (E) side, and the tip of the upper guard rod 1 comes into contact with the ceiling 6 at the position P3.
A rubber 1a is attached to the horizontally bent tip of the upper guard rod 1 so that it is less slippery when in contact with the ceiling 6. - 特許庁

Since the lighting 5 tries to swing further to the east (E) side, as shown in FIG. It is pushed upward along the upper guard rod 1 and the tip is pressed against the ceiling at the position P3.

The lighting 5 tries to swing further to the east (E) side, but the tip of the lower guard rod 2 cannot move due to the friction caused by the rubber 1a attached to the tip of the upper guard rod 1 at the position P3. As shown in FIG. 6, the coil portion 2b twists and bends, and the coil portion 2b converts the oscillating energy into torsional energy and absorbs it.

When the shaking is strong, the lighting 5 tries to shake further to the east (E) side, but the force that the lower guard rod 2, which is absorbed by the coil part 2b and twists and bends, repels and tries to return to its original position When the static friction force at the contact point P3 of the guard rod 1 with the ceiling 6 is exceeded, the P3 portion slides and moves to the east (E) side as shown in FIG. The fulcrum P2 of the movement also moves to the east (E) side, and the tension that pulls the lighting 5 back to the opposite west (W) side is reduced, so that the amplitude of the return is also reduced and the shaking can be quickly damped.

At this time, the swing fulcrum returns from P2 to P1, and at the same time, the swing radius also returns from L2 to L1. The resonance phenomenon caused by the application of constant-period external force such as long-period vibration that occurs in

Figure 3 assumes that the building initially shook to the east (E) side, but even if the building first shook to the north (N) side or south (S) side, the upper and lower guard rods 1 and 2 , the cord 5a rotates in the direction opposite to the swinging direction and becomes tilted downward as shown in this figure, which is the same as when it first swings to the east (E) side.
Also, when the building initially sways to the west (W) side, the tip of the upper guard rod 1 immediately contacts the ceiling, and the state shown in FIGS. It will be.

FIG. 8 shows an embodiment in which the upper and lower pairs of guard rods, holders and magic bands in FIG. 1 are replaced with only one pair.
In this case, the joint part of the lower guard rod disappears, and the lower guard rod in FIG. 5 does not rise along the upper guard rod. Therefore, it is suitable for use in small lighting with short hanging cords.

This fixture does not require work such as fixing it to the ceiling with screws or metal fittings. It has the advantage of being easy to use even in rooms where the height from the floor to the ceiling is low because the hanging position of the item is not lowered.

In addition, by installing this device, the natural period of the existing suspended product changes during one reciprocation, making it difficult for the resonance phenomenon to occur. If you attach it to lighting, decorations, information boards, etc. that are suspended in high places such as high floors of buildings that are prone to accidents, stations, halls, etc., it will prevent them from shaking like a cradle and break or fall. It is possible to make it difficult for accidents to occur.

1 Upper guard rod 1a Rubber 2 Lower guard rod 2a Joint 2b Coil 3 Holder 4 Magic band 5 Existing lighting 5a Existing cord 6 Ceiling P1 Rocking fulcrum (when the guard rod is not in contact with the ceiling)
P2 Swing fulcrum (when the guard rod is in contact with the ceiling)
P3 Point of contact between tip of guard rod and ceiling L1 Swing radius from P1 to center of gravity L2 Swing radius from P2 to center of gravity

Claims (2)

The main components are a guard rod, holder, magic band, etc. The guard rod is inserted into a holder so that it can be rotated horizontally, and the holder can be attached to existing hanging lighting cords using a magic band. or chain, and when an earthquake or other sway occurs, the tip of the guard rod comes into contact with the ceiling to constrain the movement of the cord and chain, preventing the lighting, etc. from swaying significantly. A seismic isolation device. By moving the swinging fulcrum and changing the swinging radius during one reciprocating motion, the natural period of the suspended existing product changes, making resonance less likely to occur. The seismic isolation device according to claim 1, wherein