Patent ID: 7919718

Claim:
An acceleration switch which comprises: a closed container formed by hermetically securing an open end of a bottomed cylindrical conductive housing to a circumferential edge of a substantially circular metal header plate having a substantially central through hole, the housing having a bottom which is inclined gradually upward from a central part thereof toward an outer circumferential side; a conductive lead terminal inserted through the hole of the header plate and hermetically fixed in the hole by an electrically insulating filler; a contact member conductively secured to a distal end of the lead terminal at the closed container interior side and having a plurality of elastically deformable movable contacts which are substantially concentric about the distal end of the lead terminal; a conductive inertia ball accommodated in the hermetic container, the inertia ball being caused to roll in the housing thereby to contact the movable contact of the contact member, whereby the housing and the contact member are rendered electrically conductive, and a braking member disposed between the movable contacts so as to be capable of urging the inertia ball in a direction of a center of the closed container, the braking member including an elastically deformable braking portion, wherein the braking portion of the braking member is extended so as to normally contact the inertia ball.