US 4,386,335 AGranted

Electric plug type fuse

AssigneeGould Inc., Electric Fuse Div.

InventorsTerry R. O'Brien, Kurt W. Lechner

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Abstract

An electric plug type fuse. The hollow glass body thereof contains a strip-like spring conductively connected to the bottom contact in the insulating tip of the fuse. Said spring is arcuate and has a center of curvature situated at the side of the spring where the longitudinal axis of the glass body is located. A solder joint preferable of a eutectic metal connects the end of the spring remote from the bottom contact to a fusible element capable of interrupting short-circuit-like currents, i.e. a ribbon type fusible element having at least one point of reduced cross-section. The aforementioned spring and the fusible element enclose an angle of approximately 90 deg. and the end of the fusible element remote from said spring is conductively connected to a screw shell. The spring puts the fusible element under tension and is released from it when the solder joint connecting both parts melts.

Claims8

Dependent claims

An electric plug type fuse including a substantially cylindrical hollow glass body defining a cavity and being screw threaded on the outer surface thereof, a contact button support of an electric insulating material of which one end projects into said cavity and the other end projects in the opposite direction away from said cavity to the outside thereof, a contact button on the outer end of said contact-button-support, a metal shell overlapping said contact-button-support, said metal shell being screw threaded, and the screw threads thereof mating with the screw threads on said glass body, wherein the novel features include:

a. strip-like spring having one end thereof conductively connected to said contact button and the other end of said spring extending into said cavity defined by said glass body;
b. a fusible element capable of interrupting short-circuit-like currents, one end of said fusible element being conductively connected to said metal shell;
and,
c. a solder joint conductively joining the othe end of said fusible element to the other end of said strip-like spring said solder joint holding said strip-like spring in a deflected position where said spring serves to place said solder joint in tension, whereby;
upon fusing of said fusible element or melting of said solder joint said springs resiliency will cause it to move away from said fusible element to a nonconducting position.

2 more elements

Dependencies are inferred from the claim text.