Apparatus for measuring the intensity of a seismic shock

Details Apparatus for measuring the intensity of a seismic shock Apparatus for measuring the intensity of a seismic shock

1987-01-23

1988-08-30

Kyle, Deborah L.

Communications, electrical: acoustic wave systems and devices

Signal transducers

Receivers

73649, 33 1HH, 367 13, G01V 100

Patent

active

047681756

ABSTRACT:
This is an apparatus for measuring the intensity of a seismic shock applied to the apparatus. The apparatus includes an enclosure in which is a system of weights movable in response to an applied mechanical shock, and connected to a movable transmission member. The transmission member contacts a first spiral cam rotatably mounted on a balanced rockable lever. The cam turns the lever angularly when the transmission member is moved by the weights. A spring connected to the lever tends to inhibit it from turning out of its balanced position when the transmission member moves. A second spiral cam is also rotatably mounted on the lever. A fixed stop member contacts the second cam to prevent the lever from turning back to its original balanced position when the lever is turned out of this position in response to an applied mechanical shock. An index needle connected to the lever indicates on a scale the amount that the lever has turned. A reset mechanism may also be provided to reset the lever to its original balanced position and to reset the index needle to starting position on the scale.

REFERENCES:
patent: 4117496 (1978-09-01), Sattaripour
patent: 4280206 (1981-07-01), Guralp
patent: 4615022 (1986-09-01), Muramatsu

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