GB189817647A - Improvements in or relating to Electrical Switches Plugs and the like. - Google Patents

Abstract

17,647. Bally, F. G. Aug. 16. Switches ; couplings.-Relates to the connection of a switch with a wall socket or the like so that the plug can only be inserted or removed when the switch is 'off.' Fig. 2 shows the combination of a switch and coupling of the concentric type. A plate B having a keyhole slot B<3> and sliding in a groove in the socket A is connected by an arm B' with the switch handle C'. The plug D, Fig. 3, can only be inserted in the socket when the circular portion of the slot registers with the opening in the socket. The plug D is grooved at D', and is thus locked in position when the switch is 'on.' The switch also cannot be moved until the plug is fully home. In order to close the mouth of the socket when the plug is removed, a plug E slides on the central contact and is forced upwards by the spring F. It is grooved at E' so that it can be locked by the plate B. In a modified form shown in Fig. 5, the socket is constructed for a plug having two pins, and the plate B has openings which, when the switch is in the off position, register with the contacts of the sockets. The pins have notches for locking them in position, and the plate may have a yielding connection with the switch handle.