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. 27, 2002
Filed:
May. 19, 2000
Stig Bakke, Ålgård, NO;
Bakke Technology AS, Algard, NO;
Abstract
A hydraulically releasable coupling device has an upstream part arranged to permit connection to tubing and a downstream part arranged to be connected to a tool or equipment. A radially expandable locking ring is configured to expand and thereby to disconnect the coupling device. A movable securing ring portion encloses the locking ring at least partially in an unexpanded locking position thereof. A piston body is connected to the securing ring portion and has a through passage which is provided downstream with a restriction element. The piston body has an upstream piston head with an annular upstream reaction surface and an annular downstream reaction surface for pressure fluid in counterflow. The piston head has a larger diameter than a downstream extension formed as a piston skirt, in which the restriction element is mounted. A longitudinal portion of the piston skirt, next to the piston head, is enclosed by a cylinder chamber of the piston head accommodating a return spring.