US 4,970,917 A · Stud extractor and wrench apparatus

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.

Claims10

Dependent claims

A stud extractor and wrench apparatus operable to contact, grasp, rotate, remove or insert an object, comprising:

(a) a main drive assembly connected to a main cam lock assembly;
(b) said main cam lock assembly includes an outer housing member having a cam insert member mounted therein;
(c) said outer housing member formed within a elliptical cavity opening to receive and contact said cam insert member;
(d) said cam insert member provided with a main cam body having an opening and an outer cam surface;
and
(e) said outer cam surface engagable with said elliptical cavity opening and operable on relative rotation therebetween to change the size of said opening.

3 more elements

Dependencies are inferred from the claim text.

Stud extractor and wrench apparatus

Life of this patent

Stud extractor and wrench apparatus

Life of this patent

Abstract

Claims10