Vibration sensing device

Details Vibration sensing device Vibration sensing device

1990-06-29

1991-10-01

Scott, J. R.

Electricity: circuit makers and breakers

Special application

Change of inclination or of rate of motion responsive

200 6151, H01H 3514

Patent

active

050535897

ABSTRACT:
A vibration sensing device comprises an insulated housing having supported therein a weight and a centrally extending conducting shaft. Two spaced parallel conductors extend across the housing and engage the shaft, one above and one below the shaft and engaging the top of the shaft and the bottom of the shaft, respectively. The weight presses the shaft down on the nearer conductor and up against the farther conductor. The shaft thus acts as a lever using the near conductor as a fulcrum and pressing upwardly against the farther conductor. The shaft thus bridges the two conductors and connects them. The housing when mounted with the shaft horizontal maintains a closed circuit which will be opened when the housing is subjected to vibrations such as those occurring during a break-in. The opening of the circuit is used to actuate an alarm. The sensitivity of the device may be adjusted by moving the conductors with respect to one another, an adjusting screw available outside the housing being provided for this purpose.

REFERENCES:
patent: 2369977 (1945-02-01), O'Toole
patent: 4212208 (1980-07-01), Weale et al.
patent: 4339640 (1982-07-01), Grant
patent: 4368637 (1983-01-01), Anderson
patent: 4686335 (1977-08-01), Grant

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