JPS628128B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a seismic intensity detection device.

Conventionally, devices are known that detect horizontal vibrations and vertical vibrations separately, but there is no device that detects both of these vibrations together.

The present invention was developed in view of the current situation, and includes a vertical shaft that is movable up and down with respect to the machine frame, and has a weight suspended at its center via a universal joint at the lower end of the vertical shaft.
A plurality of pins are provided passing through a guide surrounding the vertical axis, the lower ends of the pins are supported at the same circumferential position on the upper end surface of the weight, and a slide surrounding the vertical axis is attached to the upper end of the pins. A mover is provided, and when the weight moves due to vertical vibration and horizontal vibration of an earthquake, the amount of movement is transmitted to the slider via a pin, and the seismic intensity is detected from the change in the amount of movement of the slider. It is characterized by

An example of implementing the present invention will be described with reference to the accompanying drawings.
In the drawing, 1 is the machine frame, 2 is the guide fixed to the machine frame 1, and 3
indicates a vertical rod provided vertically passing through the center of the guide 2; the vertical rod 3 passes through a sleeve 4 provided at the center of the guide 2, and is attached to its upper end with a washer 5 so as to be movable vertically. Supported. Reference numeral 6 indicates a weight provided at the lower end of the vertical shaft 3, and the center of the weight 6 is suspended from the vertical shaft 3 via a universal joint 7.

Reference numeral 8 indicates a plurality of hard holes arranged at equal intervals in the guide 2, and each of the hard holes 8 is provided with a pin 9 passing through it vertically. Support on the circumference. In this case, the upper end surface of the weight 6 is at the same height as the rotation center of the universal joint 7.

Reference numeral 10 denotes a slider slidably fitted onto the vertical shaft 3, and the slider 10 is supported on the upper end of the pin 9. In this case, when the weight 6 moves up and down depending on the size of the vertical vibration, the vertical shaft 3 is directly pressed in response to this, thereby directly moving the slider 10 up and down. Further, during horizontal vibration, the weight 6 swings around the rotation center of the universal joint 7. The swing pushes up the pin 9 in the same manner as described above. Therefore, the slider 10 moves up and down as in the case described above.

Therefore, by detecting a change in the amount of movement of the slider 10, the seismic intensity can be detected.

In the illustrated example, one end of a lever 11 supported on a machine frame 1 by a shaft 14 so as to be swingable in the middle thereof faces the upper surface of the slider 10, and the other end of the lever 11 projects from a rotating shaft 12. When pushing down the protruding arm 13 by swinging the lever 11, the shaft 12 is rotated, and the rotation of the rotary shaft 12 is controlled by the gear train 1.
5, a rotating shaft 16 is provided which rotates in conjunction with the rotating shaft 12, and a pointer 17 provided on the rotating shaft 16 indicates the seismic intensity and closes the operating circuit of the alarm 18 at a certain seismic intensity. The alarm was triggered by closing switch 19.

In the illustrated example, a weight 21 is suspended from the upper end of the vertical shaft 3 via a wire 20, thereby canceling out part of the weight of the weight 6. Further, the adjusting arm 22 is made to protrude from the opposite side of the protruding arm 13 of the shaft 12, so that the protruding arm 13 is always in contact with the lower surface of the lever 11.

According to the present invention, a weight is suspended from the center of the machine frame via a universal joint at the lower end of a vertical shaft that is movable up and down, and a guide is provided to surround the vertical shaft. A plurality of pins are provided passing through the through holes provided in the guide, and the lower ends of the pins are supported on the same circumference of the upper end surface of the weight and at the same height as the rotation center of the universal joint. , and a slider moving along a vertical axis is provided at the upper end of the pin,
When the weight moves due to the vertical vibration and horizontal vibration of an earthquake, the amount of movement is transmitted to the slider via the pin, and the seismic intensity is detected from the change in the amount of movement of the slider. It is easy to obtain a display of seismic intensity by capturing both vibration and vertical vibration, and is particularly effective in detecting vertical movement quickly and reliably.

[Brief explanation of the drawing]

The drawings show an example of the implementation of the present invention, and FIG. 1 is a plan view, FIG. 2 is a cross-sectional view taken along the line, and FIG.
The figure is a front view. 1... Machine frame, 2... Guide element, 3... Vertical shaft, 6... Weight, 7... Universal joint, 9... Pin, 10... Slider.

Claims (1)

[Claims] 1 At the lower end of a vertical shaft that is movable up and down with respect to the machine frame, a weight is suspended at the center via a universal joint, and a guide is provided surrounding the vertical shaft, A plurality of pins are provided passing through the provided through holes, the lower ends of the pins are supported on the same circumference of the upper end surface of the weight and at the same height as the rotation center of the universal joint, and A slider that moves along a vertical axis is provided at the upper end, and the amount of movement when the weight moves due to vertical vibration and horizontal vibration of an earthquake is transmitted to the slider via a pin, and the slider A seismic intensity detection device characterized by detecting seismic intensity from changes in the amount of movement of the seismic intensity.