HEAT RELEASABLE ASSEMBLY OF MEMBERS CONNECTED BY A FUSIBLE ALLOY

摘要

HEAT RELEASABLE ASSEMBLY OF MEMBERS CONNECTED BY A FUSIBLE ALLOYAbstract of the DisclosureIn an overload heat coil assembly for overload protectors intelecommunications systems, a copper rod is positioned in the bore of abrass sleeve, an annular gap between rod and sleeve being filled with afusible alloy, which melts and permits relative axial movement betweenrod and sleeve on overloads. Problems exist in obtaining good bondingbetween the fusible alloy and the copper rod and brass sleeve, because ofrapid oxidation which occurs on copper and copper containing metals. Byplating the rod and sleeve with a particular bright acid tin, over brightacid copper, plated in temperature controlled solutions, good bonding isobtained with undesirable affects of the fusible alloy by this tinplating.- i -