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:
Sep. 28, 1982
Filed:
Oct. 02, 1980
Robert A Mahaney, Graytown, OH (US);
Champion Spark Plug Company, Toledo, OH (US);
Abstract
A glow plug for accelerating the ignition of fuel in a combustion chamber of a diesel engine is disclosed. The glow plug comprises a shell releasably engagable with a head of a combustion chamber of the diesel engine, and an electrically conducting, tubular heater carried by and electrically connected to the shell. The heater has an open end within the shell, and an opposed closed end extending longitudinally therefrom. The glow plug also comprises a heating filament disposed within the heater adjacent to the closed end and electrically insulated from the tubular body thereof. The heating filament has a first end electrically connected to the closed end of the heater and a second end; it is one which heats to a predetermined design temperature when a specified voltage is applied thereto. The glow plug also comprises an insulator carried by the shell, and a terminal assembly carried by the insulator. The terminal assembly comprises a heater terminal which is electrically connected to the second end of the heating filament, and at least one preheat terminal which is electrically connected to an intermediate coil of the heating filament. The rise in temperature of the heater is accelerated when a switching circuit enables application of the specified voltage to the preheat terminal(s) for a preheat time period equal to the time required to raise the temperature of the filament from ambient temperature to the design temperature.