Patent ID: 6039129
Filing Date: 2000-03-21
Classification: E21B

Abstract:
A locking system for selectively locking a linearly slidable sleeve to a main body of a tool, said tool adapted to travel within a conduit, said locking system adapted to cooperate with an inner surface of a portion of said conduit and comprising:first and second contiguous recesses formed in said main body, said first recess being of greater depth than said second recess;an opening formed in or associated with said sleeve and locatable over said first or second recess; anda locking member adapted for capture within said first recess and to extend through said opening for abutment with said inner surface, said locking member being movable between a first position in which said locking member resides in said first recess and locks said sleeve against sliding relative to said main body, and a second position in which said locking member can escape to said second recess to allow said sleeve to slide relative to said main body, said locking member being movable from said first position to said second position in response to a variation in configuration of said inner surface of said portion of said conduit.