Abstract: A metallic rod end is fixedly secured to a relatively softer metallic tube by providing imprinted screw threads on the rod free end. Then grooves are imprinted in the screw threads and to a depth not greater than that of the minor diameter of the screw threads and with the grooves extending axially of the rod end. The tube is provided with a threaded bore mating the screw threads on the rod end. The threads in the threaded bore are provided by imprinting and the entrance portion thereto has a diameter substantially equal to the major diameter of the screw threads. After threading the rod into the tube until the grooves are aligned with the entrance portion, then the tube is swaged causing flow of metal from the tube to the rod end and into the grooves therein. This first rod end may be provided with an internally threaded bore so as to function as an insert between the metallic tube and a second externally threaded rod end.

Abstract: An electrical shocking device includes a manipulatable, preferably tubular, housing, one end of which is open and provided with a flange. A plastic tube is movably positioned within the housing against the flange. The plastic tube contains an electric circuit, including a spark gap and circuit members for converting a low direct voltage into a very high voltage, storing a high voltage charge and intermittently discharging the storage device. A pair of probes extend outwardly from the tube beyond the flange, those ends of the probes within the tube being connected to opposite ends of a charge-storing capacitor through a spark gap in series with one of the probes. Batteries and a switch are provided within the housing for supplying the low direct voltage to the circuit upon movement of the tube in response to force on the probes.

Abstract: The linear motion arresting device has a stationary member with an internal bore. A mating piston, formed of a plurality of piston parts, is slidable in said bore. One piston part is connected to a prime mover and the others are slidable toward and away from, and lengthwise of, said one piston part. Each of the piston parts has an elongated groove extending parallel to the bore and with the grooves providing directly between piston parts, a ball receiving channel in which a ball may travel and with the channel extending axially of, and at an angle to, the bore and with portions of the two opposite ends of the grooves extending more radially inwardly of the bore than the other two. A relatively nondeformable ball is mounted for travel in the ball receiving channel. A spring construction moves the piston parts in opposite, axial directions until the more radially inward portions of said grooves contact said ball.

Abstract: A piston is mounted for relative sliding movement in the cylindrical bore of a sleeve. The piston comprises a plurality of piston parts, one, a driving piston part connected with a prime mover or a fixed support. A piston rod, supported by the piston at one end and by a sleeve guide at the other end, drives said driving piston part. The other and driven piston parts are connected with, and driven by said one piston part through a metallic ball, rollable in a groove formed in abutting piston part surfaces. This groove extends generally parallel to the piston axis, at an angle thereto, and with the opposite end groove portions thereof closest to the piston axis. When the piston parts move in given and opposite directions, the depth of the groove reduces and the ball functions to transmit motion from the driving piston part to the driven piston part. When the piston parts move in the other direction, the depth of the groove increases and no motion is transmitted.