Tools – Wrench – screwdriver – or driver therefor – Stud-removal and implacement
Patent
1989-05-30
1990-11-20
Parker, Roscoe V.
Tools
Wrench, screwdriver, or driver therefor
Stud-removal and implacement
81 344, B25B 1350
Patent
active
049709178
ABSTRACT:
This invention relates to a stud extractor and wrench apparatus using a cam action locking feature to grasp a stud member or bolt head member for removing same. The stud extractor and wrench apparatus includes a main cam lock assembly driven through a main drive assembly. The main drive assembly can utilize a conventional ratchet drive assembly or can take the form of a box end wrench drive assembly. The main cam lock assembly includes an outer housing member having mounted therewithin a cam insert member. The outer housing member has an elliptical cavity opening with an inner cam surface and a wrench head section. The wrench head section resembles a standard socket wrench member which is engagable with the ratchet drive assembly for rotating in selected opposite directions. The cam insert member can be releasably mounted within the outer housing member and includes an elliptical cam body. The elliptical cam body has a central serrated opening to receive and engage the stud member or bolt head member during a removal operation. The elliptical cam body has an outer cam surface engagable with the inner cam surface of the outer housing member so as to provide for a cam actuated clamping action on relative rotational movement of the outer housing member and the cam insert member. The cam insert member can be color coded and easily placed within or removed from the outer housing member for selecting ones of various sizes for grasping a stripped stud member or bolt head member.
REFERENCES:
patent: 1279349 (1918-09-01), Johnson
patent: 2681582 (1954-06-01), Valvano
Parker Roscoe V.
Rein Phillip A.
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