Plunger operated electrical switches

Claim 1

AN IMPROVED ELECTRICAL SWITCH OF THE KIND INDICATED COMPRISING A TUBULAR BODY MEMBER COMPOSED OF METAL AND HAVING MEANS FOR RETAINING IT IN AN APERTURED METAL SUPPORT, A PLUNGER COMPOSED OF NYLON OF OTHER ELECTRICALLY NON-CONDUCTIVE MATERIAL AXIALLY MOVABLE WITHIN SAID BODY MEMBER, A HELICAL SPRING LOCATED WITHIN SAID BODY MEMBER BETWEEN OPPOSED SHOULDERS ON SAID BODY MEMBER AND THE PLUNGER RESPECTIVELY, THE INNER END PORTION OF SAID PLUNGER BEING COMPRESSIBLE AND PROVIDED WITH ONE OR MORE LATERAL PROJECTION ADAPTED TO PERMIT THE INNER END PORTION OF THE PLUNGER TO PASS THROUGH SAID BODY MEMBER AND SPRING WHEN THE INNER END PORTION OF SAID PLUNGER IS COMPRESSED BUT TO OVERHANG THE ADJACENT INNER END PORTION OF SAID BODY MEMBER WHEN THE PLUNGER, SPRING AND BODY MEMBER ARE ASSEMBLED, THE INNER END PORTION OF SAID PLUNGER BEING BIFURCATED LENGTHWISE SO AS TO FORM OPPOSED RESILIENT SECTIONS FORMING A TAIL PORTION WHICH IS OF RELATIVELY SMALLER DIAMETER THAN THE REMAINING OF HEAD PORTION OF SAID PLUNGER SO AS TO FORM ONE OF SAID SHOULDERS, A SUBSTANTIALLY CIRCUMFERENTIAL GROOVE BEING FORMED IN THE OPPOSED SECTIONS OF SAID TAIL PORTION AND SPACED INWARDLY FROM THE FREE END THEREOF SO AS TO FORM INNER AND OUTER SHOULDERS, THE OUTER SHOULDERS BEING OF LARGER DIAMETER THAN THE INNER SHOULDER SO AS TO NORMALLY OVERHANG THE ADJACENT INNER END OF SAID BODY MEMBER, THE FREE END OF SAID TAIL PORTION BEING TAPERED LENGTHWISE AND INWARDLY FROM SAID OUTER SHOUDER SO AS TO BE CAPABLE OF PASSING THROUGH AN APERTURED DETACHABLE ELECTRICAL CONTACT BY THE INNER END PORTION OF SAID PLUNGER AND WHICH NORMALLY ENGAGED THE INNER END PORTION OF SAID BODY MEMBER UNDER THE INFLUENCE OF SAID SPRING, SAID RETAINING MEANS INCLUDING A SERIES OF CIRCUMFERENTIALLY SPACED LOBES FORMED IN THE WALL OF SAID BODY MEMBER WHICH IS SLIT LENGTHWISE AND PROVIDED AT ITS OUTER END WITH A LATERALLY PROJECTING LOCATING FLANGES AND ONE OR MORE EARTHING TABS EXPRESSED OUTWARDLY FROM THE WALL OF SAID BODY MEMBER IN SUCH A MANNER THAT THE FREE END OF EACH TABS IS LOCATED IN CLOSELY SPACED RELATIONSHIP WITH SAID LOCATING FLANGE.