Importance

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Abstract

A method and apparatus for removing liner bolts over a range of impact angles is disclosed. Complimentary liner bolt and driving assembly features cooperate to control energy transfer during impact of the driving assembly upon the liner bolt. The liner bolt includes a convex annular portion on the end face of the bolt shank and a concave depression in the end face of the bolt shank. The driving assembly includes a concave driving face for impacting the convex annular portion of the bolt shank and a spring-loaded guide pin seated in the concave depression of the shank for guiding the concave driving face into contact with the bolt shank. A retraction collar may be associated with the guide pin through a slot in the driving member to retract the guide pin as the driving member chases the liner bolt from the surrounding structure. The respective profiles of the convex shank portion, concave depression, concave driving face, and guide pin accommodate impact angles of approximately between 0-15 degrees, providing increased versatility, efficiency, and safety in removing liner bolts.

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First Claim