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:
Sep. 20, 2005
Filed:
Oct. 27, 2003
Brian Cruickshank, The Woodlands, TX (US);
John P. Boyce, Aigburth, GB;
Christopher J. Caton, Pitmedden, GB;
Bruce Mcgarain, Stonehaven, GB;
Brian Cruickshank, The Woodlands, TX (US);
John P. Boyce, Aigburth, GB;
Christopher J. Caton, Pitmedden, GB;
Bruce McGarain, Stonehaven, GB;
Smith International, Inc., Houston, TX (US);
Abstract
A lockable motor assembly for use in a well bore comprises a PDM motor having a rotor and a stator. A locking member has a splined projection which is received within a splined recess of the rotor and external splines which mate with splines provided on a sub connected to the stator. The components are held in this configuration by a shear ring until the fluid pressure within a chamber defined between the locking member and the sub is sufficient to cause the shear ring to shear. The locking member may then move out of the engagement with the rotor to free the motor for operation. The locking member is held in this position by a ratchet mechanism.