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:
Aug. 04, 1981
Filed:
Mar. 26, 1979
Tamio Uemura, Kawasaki, JP;
Tokico Ltd., Kawasaki, JP;
Abstract
An electromagnetic locking type actuator is constituted by a control member reciprocatable in a fluid passage to control the fluid pressure in the passage, an electromagnetic device for applying a first magnetomotive force to the control member, and a magnetic device for always applying a second magnetomotive force to the control member. In the actuator, when an electric current in one direction is applied to the electromagnetic device the first and second magnetomotive forces are added to move the control member in an attracting direction so that the control member is attracted and held at its movement terminating position by the magnetic device even after the first magnetomotive force no longer acts at that position. When an electric current in a direction opposite to the one direction is applied to the electromagnetic device the first and second magnetomotive forces cancel each other thereby maintaining said control member in a magnetically released state.