Abstract: An integrally molded housing having outwardly directed, spaced-apart arms thereon for mounting within or attachment to a panel is disclosed. The arms are located on the body portion of the housing such that a distance slightly less than the thickness of the panel in which the housing is to be received exists between the end of each arm and a circumferential flanged surface on the housing. As the housing is being received through the panel, the arms are deflected inwardly and then spring outwardly causing a surface on the end of each arm to engage a surface on a complementary keyway in the panel. Another surface is provided on the end of each arm to prevent the disengagement of the arm from the surface surrounding its adjacent complementary keyway upon longitudinal movement of the housing toward the panel. The housing can be readily removed from the panel by the application of inwardly directed pressure on the arms.

Abstract: A new and improved piezoelectric high voltage impact mechanism uses an actuator with slanted internal walls to tilt a straight actuating spring. The spring constrains a hammer so that the hammer is held on a ledge in the body as actuation is initiated. Energy is stored in the spring during actuation and the actuator pushes the hammer off the ledge, initiating the impact. Component parts and assembly are simplified compared with prior art devices.