Abstract: A vice device consisting of a frame containing a fixed jaw and a rack, the rack being placed in a plane perpendicular to the fixed jaw; and a mobile jaw, containing a body and a jaw mobile in movement compared to the body. The jaw is mobile in movement parallel to the rack with the possibility of locking onto the rack by means of a rack mobile in the body equipped with notches at its end opposite the rack and biased in the direction of rack by at least one spring and maneuverable by a lever connected to the body. The end of the body connected to the lever being linked to a cam which leans on the posterior part of the mobile jaw in order to allow the spreading of the mobile jaw compared to the body in the direction of the fixed jaw.

Abstract: Apparatus for rotating a cylindrical workpiece to be machined, having one or two automatic clamping devices on a rotatable hollow driven shaft into which the workpiece is inserted. Each clamping device has three chuck jaws mounted to swing into clamping engagement with the workpiece. Two pivots are provided for each jaw which swings about one or the other of them depending on the direction of rotation: the provision of two pivots gives a smaller and less cumbersome apparatus. To make the pivots swing into clamping engagement, a floating drag plate is freely rotatable on the shaft adjacent the clamping device. It is braked, to restrain rotation with the clamping device but it is positively linked to each jaw by a gudgeon pin, so that on rotation of the clamping device the braking restraint on the floating drag plate is transmitted to the jaws and urges them into clamping engagement with the workpiece.