JPH08321236A - Seismic sensitive switch for earthquake informing apparatus - Google Patents

Abstract

PURPOSE: To heighten ultimately the seismic sensing ability, have a sensitivity adjusting function, and provide portability by installing an O-ring for spring adjustment on the trunk part of a spiral spring in such a way as movable in the vertical direction, and attaching a metal plate to the inner wall surface of a cylinder. CONSTITUTION: A metal plate 3 is attached to the inner wall surface of a cylinder 4 so that an electrode B is formed, and an O-ring for spring adjustment 5 is installed on the trunk part of a spiral spring of special make 1 in such a way as movable in the vertical direction. A weight 2 is fixed to the top of the spring 1 and another electrode A is formed by securing vertically to the center of the bottom plate of the cylinder 4. When the top of the spring 1 (electrode A) oscillated by seismic trebles etc., touches momentarily the plate 3 (electrode B), current is fed to an electronic circuit of an earthquake alarm, wherein adjustment of the sensitivity is made by moving a ring 5 with the trunk part of the spring 1. This yields the same effect as the spring 1 expanding and contracting, and it is possible to increase or decrease the stiffness and amplitude of the spring. Even in case the switch is incorporated in other apparatus in a single piece structure, the construction is made small and light to provide portability convenient at journey etc., and in case this is connected with earthquake alarm, the switch sensitivity can be selected properly and set in accordance with the needs of a user.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seismic alarm seismic switch that is activated by momentarily connecting electrodes of an electronic circuit of an earthquake alarm by utilizing the motion of a spring spring due to a vibration.

[0002]

2. Description of the Related Art A conventional one is a method of turning on a switch by utilizing a pendulum motion of a suspended weight, a drop force of a weight, or the like as a vibration catching means, and a ball rolling in a certain groove. It seems that a device with one of the electrodes was devised, but it has not been put to practical use probably because there was a problem with the performance to catch vibrations, lack of adjustment function, etc.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a seismic response seismic switch which has an extremely high seismic ability, a sensitivity adjusting function, and portability.

[0004]

DISCLOSURE OF THE INVENTION The present invention is a seismic response earthquake switch, in which a weight 2 is attached to the upper end of a specially made spring spring 1 and vertically fixed to the center of the bottom plate surface of a cylinder 4 to form an electrode A. According to the first aspect of the present invention, a means for attaching the metal plate 3 to the inner wall surface of the cylinder 4 is used as the electrode B, and the spring adjusting O-ring 5 is attached to the cylinder 4 so that the spring adjusting O-ring 5 can be moved to the body portion of the mainspring 1. A second aspect of the present invention replaces the metal plate 3 and the spring adjusting O-ring 5 of the first aspect with a knob bolt 8 from the center of the top plate surface of the cylinder 3, and suspends a metal umbrella 9 at its lower end. This means that the means for forming the electrode B is taken.

[0005]

The present invention takes the above-mentioned means, and the upper end of the mainspring 1 (electrode A) shaken by the vibration momentarily touches the metal plate 3 (electrode B) to energize the electronic circuit of the earthquake alarm. In the sensitivity adjustment, claim 1 has the same effect as that of the spring spring 1 expanding and contracting by moving the spring adjusting O-ring 5 in the body portion of the spring spring 1, thereby increasing or decreasing the strength and amplitude of the spring. 2 is bolt 8
By rotating the knob, the metal umbrella 9 (electrode B) is moved up and down to increase or decrease the gap with the mainspring 1 (electrode A).

[0006]

INDUSTRIAL APPLICABILITY The present invention is expected to be lightweight and compact even if it is integrated with other related equipment, and has portability for traveling, etc. Until the earthquake, the sensitivity of the switch can be selectively set according to the needs of the user.

[Brief description of drawings]

1 is a sectional view of claim 1;

[Explanation of symbols]

 1 ... Spring spring 2 ... Weight 3 ... Metal plate 4 ... Cylinder 5 ... Spring adjusting O-ring 6 ... Box 7 ... Earthquake alarm equipment storage 8 ... Bolt 9 ... Metal umbrella

FIG. 2 is a sectional view of claim 2.

[Explanation of symbols]

 Same as Figure 1

Claims (2)

[Claims] A weight (2) is attached to the upper end of a specially made spring spring (1) and fixed to the center of the bottom plate surface of a cylinder (4), and a spring adjusting O-ring (5) is attached to the body portion of the spring (1). Seismic switch for earthquake alarms, which is attached to a cylinder (4) so that it can move up and down, and a metal plate (3) is attached to the inner wall surface of the cylinder (4). 2. In place of the metal plate (3) and the spring adjusting O-ring (5) of claim 1, screw a bolt with knob (8) from the top plate surface of the cylinder (4) and turn the knob to move up and down. A seismic response seismic switch with a metal umbrella (9) suspended at its lower end.