Temperature signaling device

Claim 1

A SIGNALING DEVICE TO BE INSERTED INTO AN ARTICLE TO INDICATE ATTAINMENT OF A PREDETERMINED INTERNAL TEMPERATURE COMPRISING AN ELONGATED HOUSING HAVING A PENETRATING TIP AT ONCE END AND AN OPENING AT THE OPPOSITE END, THE HOUSING BEING FLUID-TIGHT EXCEPT FOR SAID OPENING, FORMED OF A THERMALLY CONDUCTIVE IMPERFORATE MATERIAL, AND PROVIDED WITH AN AXIAL CAVITY THEREIN LEADING TO THE OPEN END; AN AXIALLY EXTENDED INDICATOR ROD RECEIVED IN SAID CAVITY AND ADAPTED FOR AXIAL SLIDABLE MOVEMENT RELATIVE TO THE HOUSING TO AND FROM RETRACTED AND EXTENDED POSITIONS, THE ROD HAVING A TRANVERSE BORE THERETHROUGH, SAID CAVITY HAVING THEREIN LATCHING MEANS; RESILIENT BIASING MEANS INTERPOSED THE ROD AND THE HOUSING AND ADAPTED TO URGE THE ROD TOWARD ITS EXTENDED POSITION; MEANS AFFORDING A LATERAL PROJECTION CARRIED BY THE HOUSING TO LIMIT PENETRATION THEREOF INTO AN ARTICLE; AND A FUSIBLE LATCH PIN DISPOSED THROUGH SAID TRANSVERSE ROD BORE AND RETAINED AGAINST SAID LATCHING MEANS NORMALLY TO RESTRAIN THE BIASING MEANS AND TO MAINTAIN THE ROD IN ITS RETRACTED POSITION, THE BEING IN THERMALLY CONDUCTIVE RELATIONSHIP TO THE HOUSING AND ADAPTED TO RELEASE THE ROD UPON ATTAINMENT OF SAID PREDETERMINED TEMPERATURE.