a. A type of drill-rod-foot safety clamp built somewhat like a spider and slips, but differing by having the slips or movable jaws attached to, and actuated by, a foot-operated lever. Long
b. A general term applied to rod and/or casing safety clamps having both fixed and movable serrated jaws that contact and securely grip the rods or casing. Long
c. A fishing tool consisting of a steel body, tapered at the top, on which slide two or more wedge-shaped, serrated-face segments. Lowered into a tubular piece of lost equipment, such as casing, the serrated segments are pushed upward toward the narrow part of the body; when the tool is raised, the segments are forced outward, securely gripping the lost equipment. Also called bulldog spear; casing dog; casing spear. Long
d. To pull or move a drill machine or auxiliary equipment by means of a block and tackle or by power derived from a rope used on the drill cathead or hoist drum. Also called cat; snake. Long
Source:
Dictionary of Mining, Mineral, and Related Terms












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