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. 05, 1981
Filed:
Nov. 13, 1978
Applicant:
Inventor:
Yoshio Ohtani, Higashimatsuyama, JP;
Assignee:
Diesel Kiki Co., Ltd., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
G01P / ;
U.S. Cl.
CPC ...
324168 ; 324166 ; 324174 ; 324228 ;
Abstract
An apparatus for obtaining a signal relative to rotational speed of a rotary element is disclosed. The apparatus comprises a permanent magnet and a magnetic body which relatively approaches or moves away from the permanent magnet according to the rotational speed of a rotary member. A magneto-sensitive switch is operated in response to the change in intensity of the magnetic field produced by the relative motion between the permanent magnet and the magnetic body. Therefore, there can be obtained an apparatus which is small in size and high reliability.