Fluid handling – Control by change of position or inertia of system
Patent
1991-02-26
1992-06-09
Nilson, Robert G.
Fluid handling
Control by change of position or inertia of system
74 2, 200 6145R, 251 66, F16K 1736
Patent
active
051198410
ABSTRACT:
A shock or vibration activated safety shut off apparatus includes a housing, an ON/OFF member drive mechanism, a first member movable rectilinearly from a first position to a second position, a second member movable rectilinearly from a third position to a fourth position, and an inertia responsive mechanism for forcing the first member into its second position in response to vibration or shock imparted to the housing. The inertia responsive mechanism includes an inertia cup having an indented upper surface, and an inertia ball normally resting on the indented surface, a lever pivotably mounted to the inertia cup and a permanent magnet mounted beneath the free end of the lever, such that when a shock or vibration causes the inertia ball to jump onto the lever and roll toward its free end, the inertia ball will be attracted to the permanent magnet and will cause the lever to be pivoted downwardly. As the lever overlies the first member, such pivoting of the lever will cause the first member to be force into its second position thereby actuating the safety device. One embodiment of the invention is specifically adapted for use with a rotary valve or the like, and includes a torsionally biased driving member which is operably couplable to the rotary valve member and is released from a lock position upon actuation of the safety shut off device. In a second embodiment, the safety shut off device is operable for use with an electrical switch or the like which can be turned off by a linearly movable member.
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