Abstract: A polishing apparatus in which one of two workpieces to be polished or abraded which contact each other at respective arcuate or spherical surfaces, is placed on a fixed base and turned or fixed in a horizontal plane with the other workpiece held under pressure by a retainer provided on a gate type frame which can be swung around the center of curvature of the contact surfaces of the two workpieces by a swinging unit capable of varying the range of swinging movement of the gate-type frame. The center of the swinging movement of this frame can be varied by changing the position of two pivot-connected block units vertically in a stepless manner and the position of the retainer to a reference axis can be varied. This enables the apparatus to be applied to workpieces having arbitrary curved surfaces to be polished and of different dimensions.

Abstract: A hydraulic shoe bolt wrench used to mount and remove shoe bolts which secure shoes to a track chain. The apparatus comprises a vertical cylinder stood upright on a frame moving on a work table, a main frame secured to a piston rod of the vertical cylinder, a wrench socket driving shaft vertically projected below the main frame, a low speed high torque motor and a reduction gear provided on the driving shaft. Pressure oil is supplied to the high speed low torque motor and high pressure oil is supplied to the low speed high torque motor. Switching of the high speed low torque motor to the low speed high torque motor is carried out by a pressure switch disposed in a low pressure hydraulic circuit.

Abstract: An apparatus for assemblying link chains of the type having paired links joined together with cross pins joining successive pairs of links longitudinally as chain links having a pitch corresponding to the distance between successive cross pins connecting the paired links. The apparatus has a pair of opposed presses each having a corresponding ram head. The ram heads are cylically operated from a retracted starting position and advanced toward each other and retracted to their retracted position. The ram heads are provided with tools on tool bars for transporting and assemblying paired links on successive cross pins. A trolley travels between the ram heads in a diection forwardly three half pitches and then in a reverse direction two half pitches. The trolley upon reaching the second reverse half-pitch returns to the forward movement of its next operating cycle. The trolley advances successive individual cross pins spaced along the path of travel and thus transports the link chain assembly.

Abstract: Described herein is a slag removing apparatus suitable for use on a padi-welding machine, which permits automation of the pad-welding operation and which essentially includes: a C-shaped roller holder located beneath a movable welding torch and provided with a rotational drive mechanism for a roller to be padded; a pair of extension arms horizontally extended on the open side of the roller holder and fixed in vertically adjustable positions; a guide rail support member provided with a rack and bridged between the extension arms in parallel relation with the rotational axis of the roller drive mechanism and detachably at least at one end thereof; a carriage having on a rockable plate a drive motor and a pinion disengageably meshed with the rack and movable along the support member; an inclined mount plate provided on the carriage with a predetermined angle of inclination; and a vibrational beating mechanism holding at least one needle bundle with the fore end thereof in face-to-face relation with the welding s

Abstract: An apparatus for displacing a line of track chain is disclosed which is employable for the purpose of disassembling, assembling, or reassembling the chain. A guide table for guiding movement of the chain is adapted to tilt only in the upward direction together with a pair of rails which are raised or lowered by actuating a first cylinder. A trolley moves forward and backward in the space as defined by both the rails by actuating a second cylinder while it is guided along the rails. The trolley is provided with an engagement rod which extends upwardly therefrom through a slot on the guide table to come in engagement to a bushing in the chain.

Abstract: A jig is disclosed for assembling a track chain which includes pin adapters and bushing adapters attached detachably to tool bars. Each adapter is provided with an outer cylinder, an inner cylinder received slidably in the outer cylinder, a biasing device held within the outer cylinder for biasing the fore end of said inner cylinder so that it protrudes outwardly from the fore end opening of the outer cylinder, and a stop attached to the outer cylinder for preventing the inner cylinder from protruding excessively out of the outer cylinder. Circular recesses are formed in the inner peripheral surface of the fore end opening of the outer cylinder.