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:
May. 10, 1994
Filed:
Oct. 28, 1992
Makoto Orii, Suwa, JP;
Hiroyuki Iwasita, Suwa, JP;
Sankyo Seiki Mfg. Co., Ltd., , JP;
Abstract
An inexpensive timer unit which can operate stably in the event of a power failure. The timer unit acts to switch the operation times of two valve mechanisms for opening and closing fluid passages. The unit comprises a rotatable windup shaft, a torsion coil spring, an eddy-current-generating governor mechanism, and two cams. Energy is stored in the spring by rotating the windup shift through a given angle so as to tighten the spring. The speed of rotation of the windup shaft when the tightened spring is released is adjusted by the governor mechanism. At this time, the rotation of the windup shaft is transmitted to the cams. The profiles of the cams are determined according to the operation times of the valve mechanisms.