Abstract: A tilt switch includes an insulating switch body with an inner circumferential wall that extends from a top end to a bottom end in an upright direction to define a columnar chamber. Two electrically conductive contact terminals are disposed at an annular seat at the bottom end and are spaced apart from each other in a direction transverse to the upright direction. A movable conductor member is disposed movably in the columnar chamber along the inner circumferential wall. When the switch body stands in line with the upright direction, the conductor member will abut against the annular seat to make electrical connection between the terminals. When the insulating switch body is tilted and deviates from the upright direction, the conductor member will be prompted to move away from the annular seat so as to break the electrical connection.

Abstract: An acceleration limit switch is disclosed, which includes a ball-shaped inertia body made of ferromagnetic material. The ball-shaped inertia body is maintained in a resting position by a permanent magnet opposed on a printed circuit board by two contact elements symmetrically engaging each other. An elastic, conductive diaphragm is mounted between the inertia body and the printed circuit board; the diaphragm being deformed when impacted by the inertia body and thereby connecting the contact element. The interior space of the acceleration limit switch, which is symmetrical with respect to rotation, has a ring-shaped bearing surface for a thin, conductive plastic mat. The printed circuit board, as the cover of the housing, rests on a housing bridge extending fully around, with a sealing ring being disposed on the housing bridge. The printed circuit board is supported by elastic hooks with deformation of the sealing ring, with the hook preferably being shaped by molding on the side of the housing.

Abstract: A device for sensing wheel rotation includes a cylindrical casing with a frusto-conical bottom end which defines a ramp for a steel ball in the casing; a shaft connected to the casing top for rotation by a vehicle wheel to cause the ball to ride up the ramp; a pair of annular contacts at the bottom of the ramp which are electrically interconnected by the ball when the wheel and consequently the shaft and casing stop rotating, whereby an electrical circuit including the contacts is closed to provide a signal indicating that rotation of the wheel has ceased.