Abstract: A method and apparatus for welding workpieces wherein the workpieces are defined by a structure having a plurality of areas with joined and bonded locations with at least one of the areas being different in depth than the depth of its adjacent area. At least one group of welding heads is provided in a predetermined spacial arrangement. When the welding heads are activated, they operate to join and bond the workpieces at certain joined and bonded locations. A carriage is provided to move the workpieces under the welding heads. Limit switches and a control circuit are provided for stopping the workpieces under the welding heads so that a first zone on the workpieces, which includes portions of more than one of the areas of different depths are under the welding heads. Means are also provided for lowering the welding heads until they come into contact with and exert pressure on the workpieces adjacent the location to be welded in the areas different in depth in the first zone.

Abstract: A mechanism for moving a sliding door of a railway car is capable of moving the sliding door between a first position in which the sliding door is supported on the body of the railway car and closes an opening in the railway car body and a second position in which the sliding door is supported by the mechanism and is moveable along the railway car body so that cargo may be loaded and unloaded into and out of the opening in the railway car. The mechanism includes a crank and a roller rotatably mounted on the crank. The crank is rotatably mounted to the sliding door about an axis of rotation which allows movement of the roller through an opening in the bottom portion of the sliding door while limiting lateral movement of the crank which allows for clearance between the roller and the opening when the roller moves through the opening in the sliding door. An actuating member is provided and is rotatably mounted on the sliding door about an axis. The actuating member has at least one lug thereon.

Abstract: A railway car door includes an operating mechanism having a pair of pipes and cranks rotatably secured to the door. By their rotation, the door is movable into and out of a door opening. The car is equipped to have internally-projecting lading restraining members removably attached to the inside car sidewall and filler members removably attached to the inside of the door. Pipe stops are provided for selectively increasing or decreasing the amount of rotation of the pipes and cranks possible so that when the filler members are attached to the door, the door can be moved laterally out of the opening a first greater distance and thereby permit the filler members to clear the sidewall or adjacent door of the car. When the filler members are removed, the door can be moved a second, lesser distance out of the opening and clear of the sidewall or adjacent door of the car.