VIBRATION SENSITIVE TRIP SWITCH FOR VEHICLE ALARM SYSTEM OR THE LIKE

摘要

An electrical trip switch (10) for an electromechanical or electronic vehicle alarm system, said switch (10) formed of a pair of overlying cantilevered thin flat unequally weighted springs (40, 42) spaced apart one above the other and mounted for uninhibited free end movement on a support (66) secured to a mounting bracket (16). The overlying spring (40) is horizontally oriented while the underlying spring (42) is directed from its location of securement to the bracket (16) canted toward the overlying spring (40). The overlying spring (40) vibrationally reacts only to sharp jars or similar shock transmitted by way a structural part of automobile frame while the underlying spring (42) reacts only to the forward, backward or lifting motion of the automobile. Means (88) are provided to adjust the sensitivity of the trip switch means by varying the gap distance.