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. 01, 2002
Filed:
Jul. 06, 1999
Daifuku Co., Ltd., Osaka, JP;
Abstract
A thermosensitive wire ( ), including a pair of phosphor bronze round wires which cause a short-circuit when the ambient temperature exceeds a predetermined temperature, is laid along an induction line ( ), and a protective device ( ) including a DC power supply unit ( ) for applying a DC voltage and a meter relay ( ) for detecting that the thermosensitive wire ( ) has caused a short-circuit is provided on both ends of the thermosensitive wire ( ). An alarm output ( A) of the meter relay ( ) is outputted to a high-frequency generating circuit ( ) so as to shut down a high-frequency current to be supplied to the induction line ( ). With this structure, even when a metal such as a tool made of iron is erroneously set near the induction line ( ), the heating thereof may be detected by using the thermosensitive wire ( ) and the high-frequency current flowing through the induction line ( ) may be shut down. Thus, fire accidents such that the induction line ( ) is heated and burnt by further heating may be prevented.