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. 23, 1979
Filed:
Jun. 01, 1977
John R D'Entremont, Foxboro, MA (US);
Jan A Abcouwer, Almelo, NL;
Other;
Abstract
A miniature motor protector device incorporates a flat, open-ended, electrically conductive metal can having a flange around its open end and having a terminal extending from the flange. A generally flat, electrically conductive metal lid is sealed to and electrically isolated from the can by an electrically insulating gasket which fits between the lid and the can flange. A thin electrically insulating film is disposed on the surface of the lid exteriorily of the can and a flat serpentine resistance heater element is positioned in heat transfer relation to the lid on top of the film. One end of the heater element is electrically connected to one end of the lid while the opposite end of the heater element extends from the opposite end of the lid to a second terminal. End portions of the lid and film are crimped over the heater element to secure the element and film to the lid. Two portions of the gasket are wrapped over respective opposite sides of the lid and portions of the can flange are crimped over the two gasket portions for securing the lid with its attached heater to the can. A thermally responsive bimetal member is mounted on the can bottom inside the can for movement in response to temperature change to engage and disengage an electrical contact on the inner surface of the lid for opening and closing an electrical circuit between the device terminals. The motor protector is particularly adapted for low cost, automated manufacture and for protecting a winding of a relatively small electrical motor.