Abstract: The tool has a socket with an opening leading to a cavity with a plurality of straight inner side walls spaced about a longitudinal axis. A plurality of wedge shaped jaws equal in number to the plurality of inner side walls are removably located in the cavity. Each jaw has a straight outer beating surface, and an inner gripping surface. Spaced apart opposite end wall member with central openings are provided for slidably supporting the jaws for movement between closed and open positions along straight paths with each bearing surface engaging an inner side wall of the socket when the jaws are located in the cavity. Guides are provided for guiding the jaws for movement along their straight paths. Springs are provided for normally urging the jaws to their closed positions and allowing a threaded member to be inserted between the jaws.

Abstract: An improved stud removal tool comprises a cylindrical socket having an open end communicating with a coaxial cavity and a shank extending coaxially adjacent the socket opposite the open end, the shank terminating opposite the socket in an anvil end adapted to cooperate with a driver such as an impact wrench for turning the socket. A plurality of axially extending cams extend on the interior wall of the socket vary the radius of the cavity at evenly distributed positions. The cams radially engage an equal number of gripping jaws contained within a removable cartridge which is free to shift relative to the socket within the cavity. The cams thereby inwardly bias the jaws for gripping a stud inserted into the cavity between the jaws. The cartridge comprises a cylindrical unit made up of the jaws separated by resilient blocks bonded to the edges of the jaws and serving to space the jaws to keep them mated with the cams. The spacer blocks also radially bias the jaws outward against the cams.