Position insensitive shock sensor with closure delay

Details Position insensitive shock sensor with closure delay Position insensitive shock sensor with closure delay

1989-03-06

1990-07-24

Scott, J. R.

Electricity: circuit makers and breakers

Special application

Change of inclination or of rate of motion responsive

200182, 200186, H01H 3514

Patent

active

049436902

ABSTRACT:
A shock sensor has a mercury wetted insert for supporting a mercury mass normally spaced from a terminal or terminals. The mercury and the terminal or terminals are contained within a sealed housing. When the sensor is subjected to a shock, the mercury is redistributed and protrudes from the insert so as to make contact the terminal or terminals and complete a circuit. By providing a mercury-non-wettable surface ahead of the mercury wetted insert, a closure delay time or operation time is selectively set. Additionally, the porosity of various membranes within the housing can be pre-selected to vary the speed in which the mercury is redistributed and thus also adjust the closure delay time. Also, a constriction in the non-wettable surface ahead of the mercury wetted insert can be utilized to provide a time delay by introducing a dash-pot effect.

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