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Deceleration sensor

  • US 4,938,140 A
  • Filed: 09/28/1989
  • Issued: 07/03/1990
  • Est. Priority Date: 09/29/1988
  • Status: Expired due to Fees
First Claim
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1. A deceleration sensor, comprising:

  • a sensor casing having a middle part defining a guide bore extending in a certain direction;

    a pair of pendulums pivotally suspended from upper parts of said casing at their upper ends in individually pivotable manner;

    a pair of biasing spring means for opposing movement of said pendulums against their inertia forces;

    a firing pin slidably received in said guide bore;

    drive spring means urging said firing pin toward fuse means which is intended to be activated by said deceleration sensor;

    a swing arm which is pivotally attached to said sensor casing at its one end and engaged by one of said pendulums at its other end; and

    a trigger arm which is pivotally attached to a middle part of said swing arm so as to be able to swing in a same plane as said swing arm, and is engaged by the other of said pendulums at its one end and engages said firing pin against the spring force of said drive spring means at its other end;

    whereby said trigger arm keeps said firing pin at its non-active state against the spring force of said drive spring means when neither one of said pendulums is displaced by more than a certain threshold value and releases said firing pin into its active state under the spring force of said drive spring means when at least one of said pendulums is displaced by more than the threshold value.

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