Mushroom type pushbutton operator

Claim 1

A PUSHBOTTOM TYPE OPERATOR COMPRISING A BODY MEMBER HAVING A PASSAGE THERETHROUGH WITH AN INNER END AND AN OUTER END, AND ADAPTED FOR CONNECTION TO A PUSHBUTTON SWITCH FOR SUPPORTING THE SWITCH WITH THE SWITCH PUSHBUTTON IN ALIGNMENT WITH THE INNER END OF THE PASSAGE, AN OPERATOR PUSHBUTTON, A STEM MEMBER THEREON AND ACCOMODATED IN AND MOVABLE ENDWISE OF, THE PASSAGE WITH ONE END OF THE STEM EXTENDING INWARDLY BEYOND SAID INNER END OF THE PASSAGE AND DISPOSED IN COOPERATING ENGAGEMENT WITH THE PUSHBUTTON OF THE SWITCH, COOPERABLE SELF-RESTORING EXPANSIBLE AND CONTRACTIBLE SNAP-FASTENING MEANS ON THE STEM MEMBER, SAID SNAP-FASTENER MEANS BEING, WHEN UNCONFINED, OF GREATER DIAMETER THAN THE PASSAGE AND BEING DISPOSED ENDWISE OF THE STEM SO AS TO LIE INWARDLY, ENDWISE OF THE STEM, FROM THE INNER END OF THE PASSAGE, AND SAID SNAP-FASTENING MEANS BEING CAPABLE, BY AN INSERTION OF THE STEM MEMBER ENDWISE A PREDETERMINED DISTANCE INTO SAID PASSAGE FROM THE OUTER END OF THE PASSAGE, OF CONTRACTING SO AS TO PASS THROUGH THE PASSAGE, AND BEING CAPABLE, UPON FURTHER MOVEMENT OF THE STEM MEMBER INTO SAID PASSAGE TO A PREDETERMINED LOCATION, WHEREIN THE SNAP-FASTENING MEANS ARE DISPOSED INWARDLY FROM SAID INNER END OF THE PASSAGE AND ARE RELEASED, OF SELF-RESTORING TO GREATER DIAMETER THAN THE PASSAGE, AND SAID SNAP-FASTENING MEANS BEING DISPOSED INWARDLY FROM SAID INNER END OF THE PASSAGE AND BEING SELF-RESTORED.