Seal for push button actuated device

Claim 1

IN A PUSH BUTTON OPERATED SWITCH HAVING A HOUSING, A BUSHING PROVIDING AN ENTRANCE TO THE INTERIOR OF THE HOUSING, AND A PUSH BUTTON POSITIONED IN THE BUSHING FOR RECIPROCATING MOVEMENT THEREWITHIN BETWEEN A DEPRESSED POSITION AND AN EXTENDED POSITION, A DEVICE FOR SEALING THE INTERIOR OF THE HOUSING FROM FLUID, DUST AND THE LIKE COMPRISING, AN ENCLOSURE MOUNTED AT ITS INNER END ON THE BUSHING IN FLUID-TIGHT RELATIONSHIP THEREWITH AND ENCLOSING THE PUSH BUTTON, THE ENCLOSURE HAVING INTERIOR TRANSVERSE AND AXIAL DIMENSIONS SUFFICIENTLY LARGE IN COMPARISON TO THE CORRESPONDING EXTERIOR DIMENSIONS OF THE PUSH BUTTON TO PERMIT RECIPROCAL MOVEMENT OF THE PUSH BUTTON WITHIN THE ENCLOSURE, THE WALLS OF THE ENCLOSURE BEING RELATIVELY THIN TO PERMIT MANUAL GRASP OF THE PUSH BUTTON, THE ENCLOSURE HAVING A CLOSURE FORMED ON ITS DISTAL END, THE CLOSURE HAVING A PORTION WEAKER THAN THE WALLS OF THE REMAINDER OF THE ENCLOSURE, THE CLOSURE HAVING A THICKENED KNOB LOCATED CENTRALLY ABOUT THE AXIS OF THE ENCLOSURE IN THE EXTERIOR OF THE CLOSURE, THE EXTERIOR KNOB HAVING A TRANSVERSE DIMENSION LESS THAN THE INTERIOR TRANSVERSE DIMENSION OF THE ENCLOSURE WHEREBY AN ACTUATING FORCE APPLIED TO THE CLOSURE AT THE DISTAL END OF THE ENCLOSURE TO ACTUATE THE PUSH BUTTON ARE CENTERED ABOUT AN AXIS RUNNING LENGTHWISE ALONG THE ENCLOSURE TO PERMIT, UPON APPLICATION OF THE ACTUATING FORCE, THE WALLS OF THE ENCLOSURE TO BULGE IN A DIRECTION AWAY FROM THE PUSH BUTTON AND TO INHIBIT THE FORMATION OF CONVOLUTIONS OF THE ENCLOSURE WALLS IN A DIRECTION TOWARD THE INTERIOR OF THE PUSH BUTTON.