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:
Dec. 09, 2003
Filed:
Apr. 30, 2002
Brian Cruickshank, Laurencekirk, GB;
John P. Boyce, Portlethen, GB;
Christopher J. Caton, Pitmedden, GB;
Bruce McGarian, Aberdeen, 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 ( ).