Combined plug unit and switch, has cable plug with contact pins resembling key teeth, turned in keyhole to engage forked connectors on circuit board

摘要

The plug component is connected to a cable (7). Each cable conductor is connected electrically to a contact pin (4). The pins resemble the profile or teeth of a key. The plug is inserted through a keyhole in the wall of a device loosely resembling a lock. On turning the plug through 90[deg], the contact pins snap into forked spring contacts, making electrical connection with them. The contacts are mounted on a circuit board. A cylinder lock form of the device is described, with a key switch.