Device responsive to shock forces

摘要

A device adapted to be actuated by seismic forces or other shock forces, to operate a valve or other controlled unit automatically when the device senses such forces. The device includes a support structure on which a weight is supported in a predetermined position relative to which the weight is displaceable laterally by shock forces in a manner causing a coacting element to be moved by the weight and actuate the controlled unit. Releasable holding means actuated by the weight function to retain the specified coacting element against movement in a direction to actuate the controlled unit so long as the weight remains in its predetermined normal position, to thereby prevent undesired actuation of the element and controlled unit by transitory forces which do not displace the weight laterally.