The Architecture of Pipelined Computers

A wrench having a fixed jaw and a movable jaw slidably mounted thereon, a cylindrical screw member rotatably mounted in an aperture formed on the base of the fixed jaw engaged with a rack on the movable jaw, the screw member having a bore forming socket means at each end and the base having sockets formed therein at said aperture, a first ball member interposed between one socket of said base and the socket means on one end of said screw member and a second ball member interposed between one socket of said base and the socket means on the other end of said screw member and spring means urging each of said balls to the sockets of said base.