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:
Oct. 03, 1978
Filed:
Jan. 21, 1977
James W Milligan, West Lafayette, IN (US);
Duncan Electric Co., Inc., Lafayette, IN (US);
Abstract
A method for making a heat sensitive fault detecting and indicating device for a watthour meter is disclosed herein. The illustrated method is particularly useful for a watthour meter that conventionally includes a potential stator and a current stator both of which are mounted thereon one or more permanent magnets and a rotatable disk assembly with disk rotation being recorded on the recording dials of a register assembly visible through the enclosing glass cover of the meter. The current stator of such a meter normally includes a pair of current coils that are heat responsive and a method is disclosed for providing a heat sensitive fault detecting and indicating device that may be associated with such coils. The method includes providing a layer of heatable material, such as a low melting point metal, for example, which layer is covered by a covering such as a sheath, for example, with predetermined portions of the sheath being thinned, as by embossing, for example, with a predetermined symbol or other indicia so that when a current surge is experienced at the watthour meter producing sufficient heat at the current coils, the low melting point metal melts and penetrates the thinned area of the sheath to thereafter indicate that a possibly damaging surge has been experienced by the meter. The indication that a surge has occurred is thus made readily visible at the sheath.