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, 1980
Filed:
Jan. 23, 1978
Richard W Seilenbinder, Milwaukee, WI (US);
Briggs & Stratton Corporation, Wauwatosa, WI (US);
Abstract
A back-up safety system stops the engine of a machine such as a power mower upon failure of a main safety system whereby release of a dead man control normally declutches a work performing member from the engine and brakes it to a stop while the engine continues to run. The back-up safety system comprises a switch that is closed upon release of the dead man control, in series with an SCR in a magneto grounding circuit. The SCR is gated on by a sensor comprising a biasing coil connected with the SCR, a ferromagnetic rotor constrained to rotate with the work performing member and having circumferentially spaced pole projections, a permanent magnet, and a core with which the coil is coupled and which cooperates with the rotor and magnet to define a magnetic circuit wherein flux density varies as rotor projections pass a pole face on the core.