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:
Jul. 07, 1981
Filed:
Mar. 14, 1979
Gerald W Ogden, Elgin, IL (US);
General Time Corporation, Thomaston, CT (US);
Abstract
A stepping motor (44) for use in and in combination with an elapsed time indicator (10) of the type including a plurality of indicator drums (102, 104, 106 and 108) and a drive train (FIG. 3) driven by the motor for driving the indicator drum (102). The motor includes a rotor (56) and a stator providing a pair of stator poles (50, 52) including a notch (94, 96) in respective poles faces. The notch creates a pair of pole faces, one of major length and the other of minor length in each stator pole. In a non-current condition, the rotor seeks a dwell or detent position rotationally toward the pole face of greater concentration of iron. When the winding (54) is pulsed, the rotor, within at least the second pulse, moves unidirectionally and between pulses locates a further dwell or detent position. An indicator (154) including a flag (156) is controlled in movement by the motor so that the flag is moved into and out of a viewing window (40) to indicate motor operation.