Anti-tampering cut-off valve cover

Claim 1

IN A TAMPER-PROOF HOUSING INCLUDING A PAIR OF MATING CLAMP ELEMENT HAVING THEIR MIDDLE PORTIONS OPPOSITELY EXPANDED AND RECESSED TO FORM AN ARTICLE-ENCLOSING POCKET, COOPERATING MEANS CARRIED WITHIN SAID CLAMP ELEMENTS FOR LOCKING THEM TOGETHER ABOUT SAID ARTICLE, SAID MEANS INCLUDING A FIRST RECESS THROUGH ONE OF SAID ELEMENTS ALIGNED WITH A SECOND RECESS IN THE OTHER OF SAID ELEMENTS, ROTATABLE LOCK MEANS COMPLETELY ENCLOSED WITHIN SAID ALIGNED RECESSES CONNECTING SAID ELEMENTS TOGETHER, SAID LOCK MEANS INCLUDING AN AXIALLY OPENING HOLLOW HEAD PORTION HAVING A TRANSVERSE NOTCH, KEY MEANS FOR BREAKING AND MAKING SAID CONNECTION BY ROTATING SAID LOCK MEANS RECEIVABLE WITHIN SAID HOLLOW HEAD, SAID KEY MEANS INCLUDING A SLEEVE HAVING A TRANSVERSE APERTURE ADAPTED TO BE ALIGNED WITH THE TRANSVERSE NOTCH IN THE HOLLOW HEAD, A PLUNGER AXIALLY SLIDABLE WITHIN SAID SLEEVE HAVING A CAMMING SURFACE AT ONE END THEREOF, BALL MEANS CAPTIVELY HELD BETWEEN SAID SLEEVE AND CAMMING SURFACE ADJACENT THE TRANSVERSE APERTURE IN THE SLEEVE ADAPTED TO BE CAMMED BY SAID CAMMING SURFACE UPON AXIAL MOVEMENT OF SAID PLUNGER INTO THE ALIGNED TRANSVERSE NOTCH IN SAID HOLLOW HEAD AND APERTURE IN SAID SLEEVE WHEREBY A POSITIVE ROTATABLE DRIVING CONNECTION IS ESTABLISHED BETWEEN SAID KEY MEANS AND LOCK MEANS.