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:
Mar. 10, 2015
Filed:
Mar. 13, 2012
Walter Oswald, Aberdeen, GB;
Walter Oswald, Aberdeen, GB;
Aker Subsea Limited, Maidenhead, Berkshire, GB;
Abstract
A subsea electric actuator comprises an electric motor and a telescopic drive connection () from the motor to a drive unit () which can be moved to and fro and converts rotary motion of the connection to linear motion of an actuating stem (). A return spring () is operable on the drive unit to urge the actuating stem towards a datum state. An electromagnetic latch () is operative when set to maintain the drive unit in a predetermined position so as to decouple the action of the return spring whereby the stem can be advanced and retracted relative to the drive unit free from the action of the return spring. De-energization of the latch allows the return spring to operate on the drive unit to return the actuating stem to the datum state. Various forms of electromagnetic latch are described.