The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 10, 1978
Filed:
Dec. 21, 1976
Sadayoshi Iwanari, Kusatsu, JA;
Osamu Umene, Otsu, JA;
New Nippon Electric Company, Ltd., Osaka, JA;
Abstract
A thermal fuse comprises an electrically and thermally conductive housing hermetically sealing switch parts of a fusible temperature-sensitive pellet, metallic plates, compression springs and a slidable resilient contact member. The contact member has a center contact portion at its bottom base and a peripheral contact portion with a plurality of tongues extending from the bottom base. The contact member of resilient conductive material is shaped to form a portion sloping over the bottom base and to form peripheral tongues extending relative to the flat surface of the assembled metallic plate when no external force is applied. The shaped contact member with its peripheral tongues has an outer diameter equal to, or smaller than, the inside diameter of the housing when no external force is applied, whereas the application of a biasing force of one of two compression springs to the contact member expands the outer diameter thereof to be larger than the inside diameter of the housing case to maintain a sufficient contact force between the contact member and the housing.