Abstract: An upper housing is ultrasonically welded to a lower housing forming a hermetic seal about two opposed ferromagnetic leads extending from a reed switch. A shock sensing magnet has a cylindrical bore and is spring biased within the housing to slide along the glass capsule of the reed switch in response to acceleration. The magnet functions as a shock sensing mass, and is shaped to increase the reed switch dwell time. The reed switch leads are bent to extend downwardly along the sides of the housing and are bent horizontally to be parallel to the housing sides and a circuit board. A strip of mu-metal wraps three sides of the housing and has tabs extending partly beneath the housing for soldering to the circuit board. The magnet and the housing are constructed from plastics which can withstand momentary high temperature associated with a re-flow solder process.

Abstract: An acceleration-sensing mass/magnet is positioned about the center activation region of a reed switch. Motion of the acceleration-sensing magnet in either direction along the reed switch causes the reed switch to close. A first mechanism for sensing shock in a first direction is contained between a flange and a lid connected by a cylindrical wall. The flange and lid ride a plastic tube that contains the reed switch. The acceleration-sensing magnet travels between the flange and the lid on the tube. A second mechanism for sensing shock in a second opposed direction is formed by positioning a second mechanism about the magnet and the first mechanism. The second mechanism for sensing shock has a spring that biases the lid of the plastic sleeve against an abutment formed by a portion of a plastic capsule that encloses the entire shock sensor.