Fastener for securing a switch to a panel

Claim 1

FASTENING MEANS FOR A WIRING DEVICE OF THE TYPE WHICH IS MOUNTED IN A CIRCULAR APERTURE OF A THIN PANEL AND WHICH INCLUDES A FLANGE FORMED ON THE FRONT OF A CASING THEREOF TO SEAT AGAINST THE PERIPHERY OF THE PANEL APERTURE, COMPRISING A CLAMP FOR REMOVABLY RETAINING SAID CASING IN FIRMLY SEATED POSITION IN SAID PANEL, SAID CLAMP SECURED TO SAID CASING AND INCLUDING A PLURALITY OF RESILIENT ARMS EXTENDING FORWARDLY ALONG ASSOCIATED SIDES OF THE CASING, EACH OF SAID ARMS HAVING A RESILIENT FREE END WITH A REARWARDLY AND OUTWARDLY INCLINED DIAGONAL FRONT EDGE FORMED THEREON, THE FREE END EDGES OF SAID ARMS HAVING A LATERAL SPACING GENERALLY BEYOND THE PERIPHERY OF THE APERTURE WHEN THE ARMS ARE RELAXED AND SAID ARMS BEING ARRANGED TO ENGAGE THE EDGES OF SAID APERTURE TO FLEX SAID ARMS TOWARD THE AXIS OF SAID CASING WHEN THE CASING IS INSERTED THROUGH SAID APERTURE TO ITS SEATED POSITION, SAID INCLINED EDGES OF SAID ARMS BEING ENGAGEABLE WITH THE PERIPHERAL EDGE OF SAID APERTURE IN THE SEATED POSITION OF SAID FLANGE THEREBY TO CLAMP SAID CASING REARWARDLY INTO A FIRMLY SEATED POSITION, SAID INCLINED EDGES OF SAID ARMS BEING FORCED INWARDLY FROM THEIR SEATED POSITION BY COACTION WITH SAID CIRCULAR EDGE UPON ROTATION OF THE CASING THEREBY TO GRADUALLY DISENGAGE THE INCLINED EDGES OF THE ARMS FROM THE CIRCULAR EDGE OF THE APERTURES SO THAT THE CASING MAY BE WITHDRAWN FROM THE PANEL, WHEREBY SAID CASING MAY BE REMOVED FROM ITS SEATED POSITION IN SAID PANEL BY THE ROTATION AND PULLING OF SAID CASING FROM THE APERTURE OF SAID PANEL.