Abstract: A device for the transfer of articles to be machined from one work station to the next one, said device consisting of a reciprocable carriage, at least one gripping unit, which is mounted at a fixed location on the carriage and which is provided with a pair of levers, movable relative to each other, with the gripper jaw at the one end and a control member at the other end and located therebetween a fixed pivotal axis for the lever on the carriage, said control member being in engagement with a driving member which is adapted to be driven by a piston-cylinder unit and with which the levers are movable in the one direction, as well as with one or more resilient elements which continuously tend to push the levers in the other direction.

Abstract: A male die for making a self-locking threaded fastener where the die has a planar working surface with a plurality of elongated teeth on the surface. The teeth are arranged in a plurality of groups with the teeth of each group extending parallel to each other and to a tangent to a bore in the die. The crests of the teeth extend above the working surface and the roots of the teeth are below the working surface.

Abstract: A self-locking fastener, particularly a nut, a bolt, a screw or a similar element, and a stamp or male die respectively for making said fastener, said fastener and stamp respectively being provided with teeth at its bearing surface or working surface respectively.The fastener and stamp respectively is characterized in that the teeth are located in a number of separate groups, that the teeth in each group are mutually parallel and that the height of the teeth remains equal over their complete length and is greater than the axial distance between the bearing surface and working surface respectively and the roots of the teeth.

Abstract: A method and apparatus are disclosed for detecting, signalling and sorting inaccurately formed articles produced by a tool machine which machine has a first relatively stationary machining element and a second movable machining element cooperating with the stationary machining element. A rotatable pulse generator rotated by any suitable drive portion of the tool machine is used to generate pulses, the number of which is proportional to the movement of the movable machining element. The number of pulses generated between the starting and stopping of the movable machine element are counted and compared to preset lower and upper limits. A logic circuit then emits a signal to a power amplifier and a reject switch if the counted number of pulses falls outside of the lower and upper limits that have been preset. The reject switch may either shut down part or all of the machine or operate a gate in a chute through which the article must pass and directs the same to the reject bin if the same is inaccurately formed.