Electric engine cooling jacket heater

Claim 1

IN ASSOCIATION WITH A CYLINDER BLOCK OF AN AUTOMOBILE HAVING A FROST PLUG APERTURE FORMED THEREIN; A BLOCK HEATER ADAPTED TO BE INSERTED WITHIN SAID FROST PLUG APERTURE, SAID BLOCK HEATER COMPRISING IN COMBINATION A CYLINDRICAL BODY PORTION, AN ELECTRIC HEATER ELEMENT EXTENDING THERETHROUGH AND CONNECTABLE, ON ONE SIDE OF SAID THEREOF TO A SOURCE OF ELECTRICAL ENERGY AND EXTENDING, WITHIN THE SAID CYLINDER BLOCK, UPON THE OTHER SIDE OF SAID BODY PORTION, SEALING MEANS COACTING BETWEEN THE PERIPHERY OF SAID BODY PORTION AND THE BORE OF SAID FROST PLUG APERTURE, AND MEANS COATING BETWEEN SAID BODY PORTION AND SAID BORE OF SAID FROST PLUG APERTURE TO MECHANICALLY LOCK SAID HEATER IN POSITION, SAID MEANS TO LOCK SAID BODY PORTION TO THE BORE OF SAID FROST PLUG APERTURE INCLUDING A CENTRAL BORE IN SAID BODY PORTION EXTENDING FROM SAID ONE SIDE TO ADJACENT SAID OTHER SIDE, AT LEAST ONE RADIALLY SITUATED DRILLING EXTENDING FROM THE PERIPHERY OF SAID BODY PORTION TO SAID CENTRAL BORE, A SCREW-THREADED BOLT ENGAGEABLE WITHIN SAID CENTRAL BORE, SAID CENTRAL BORE BEING CORRESPONDINGLY SCREW THREADED THROUGH TE PORTION THEREOF FROM THE POING OF INTERSECTION OF SAID DRILLING THEREWITH, TO THE INNER END OF SAID CENTRAL BORE ADJACENT SAID OTHER SIDE, A PIN FREELY MOUNTED FOR ENDWISE MOVEMENT WITHIN SAID DRILLING, SAID PIN BEING POINT SHARPENED UPON THE OUTER END THEREOF, AND CAM MEANS COACTING BETWEEN SAID BOLT AND THE INNER END OF SAID PIN ADAPTED TO URGE SAID PIN RADIALLY OUTWARDLY WHEN SAID BOLT IS TIGHTENED, WHEREBY SAID POINT SHARPENED END OF SAID PIN IS PROJECTED OUTWARDLY BEYOND THE PERIPHERY OF SAID BODY PORTION.