07503390 is referenced by 71 patents and cites 25 patents.

A locking device prevents stressing of other components used to hold tool portions against relative movement until a desired location is reached. A locking dog holds a first component, such as a sliding sleeve to a second component, such as a mandrel until pressure can move a piston and remove support for the dog. The same pressure that removes support for the dog to unlock the lock also forces a retainer, such as a shear pin that holds a sleeve to break to allow the sleeve to shift. The locking dog keeps stress off the shear pin when the locking dog is supported in the run in configuration. An alternative design uses a grease filled cavity to dampen shocks that could load a shear pin to the point of failure.

Title
Lock mechanism for a sliding sleeve
Application Number
11/1977
Publication Number
7503390 (B2)
Application Date
December 2, 2004
Publication Date
March 17, 2009
Inventor
Alfredo Gomez
Houston
TX, US
Agent
Steve Rosenblatt
Assignee
Baker Hughes Incorporated
TX, US
IPC
E21B 34/10
View Original Source