Security interface system for a door, window or the like

摘要

A contact unit for use in a security system for monitoring a structural opening such as a door or a window. The contact unit includes a housing of electrically insulation material, and an elongated resilient electrically conductive member that has one end fixed to the housing with an intermediate portion of the conductive member protruding through an opening in the housing. The protruding intermediate portion of the conductive member includes first and second angularly offset sections with a contact surface at the junction of the two sections for engagement by an electrically conductive actuator. The second section of the protruding portion is disposed adjacent fixed structure in the housing such that the second section willingly engages and is flexed by that fixed structure as the contact surface is moved towards the housing. This flexing interaction progressively increases the resistance of the conductive member to movement into the housing, with accompanying increase in contact pressure between the conductive member and the actuator.