Abstract: Means are shown for carrying current within the moving members of a reciprocable fluid motor such as is used to operate a welding gun. The current is transmitted from a cable to the piston rod through a stationary contactor having a portion secured to the cylinder housing and circumferentially arranged leaves held by a spring against the piston rod surface. The seal construction is such as to permit the use of lubricants on the sliding contact surface and at the same time prevent cooling water for entering the lubricating reservoir. The external contactor permits use of a hollow type piston rod allowing cooling water to be carried therethrough if desired. When used for welding gun applications the invention eliminates the need for flexible type shunts and separate electrode holders along with flexible water hoses in the welding area. The invention may also be utilized for lower power applications such as sensing devices.

Abstract: A cycloidal type drive for mechanical welding presses, automation systems and similar production type apparatus which requires mid-stroke slow down. The drive comprises an internal sun gear, a concentric bull gear, an idler gear shaft eccentrically supported by the bull gear and carrying idler gears one of which meshes with the sun gear, primary eccentrics secured to the bull gear and rotatably supporting eccentric gears, said idler gears meshing with said eccentric gears, secondary eccentrics secured to the eccentric gears, and means connecting said secondary eccentrics to a driven member. The bull gear shaft may be rotatably supported at both ends and only one primary gear assembly is needed.

Abstract: An assembly for mounting limit switches directly on the cylinder of a fluid-actuated motor or similar linearly reciprocable actuator. An extruded housing of V-shaped cross-section has exterior slots for alternate mounting on fittings extending from the cylinder ports and interior slots for supporting limit switches in a variety of positions. A reciprocable rod carrying a switch actuating cam is slidably mounted in the housing and connected to the piston rod or other actuator by a novel yoke-and-connector arrangement which, by virtue of the free rotary movement allowed the rod and the annular shape of the cam, prevents misalignment between the cam and switches during assembly or maintenance of the parts. The unit furnishes maximum freedom of choice in positioning the switches, and is adaptable for various cylinder diameters.