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: An automatic build-up welding machine for repair of workpieces such as track rollers. The machine requires no operator in charge during the welding operation. The apparatus comprises a device including a pair of guides, and a switch box connected adjustably in position to a welding torch, the switch box housing therein a pair of limit switches for reversing motion of the torch and a swing lever positioned between the limit switches. The apparatus controls the travel of the torch by varying half-cycles of the reciprocable travel thereof.

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: An improved apparatus for rebuilding worn shoe grouser for track chain by welding operation is disclosed. The worn part of shoe is cut off and replacement lug is placed on grouser so that the welding end face of the former comes in tight contact with the welding end face of the latter while they are held between the lug holding member and the shoe holding member. The shoe holding member is adapted to move forward and backward via a shoe supporting member by means of a hydraulic cylinder and the whole assembly of hydraulic cylinder, shoe supporting member, shoe holding member and lug holding member is turnable about the axis of rotary shafts by actuating the turning mechanism. While replacement lug and grouser are brought in firm contact with one another, welding operation is carried out over the one welding area on shoe to be rebuilt.

Abstract: Method to properly discriminate fitting pressure of articulated track links. Loading pressure in the ram of a track press is compared with both the lower and upper limit pressure values which are prescribed with reference to the range of fitting pressure specified for the links. Fitting of a link is determined acceptable when a sum of the press loading time is longer than a predetermined value while press pressure is maintained within the range between both the lower and upper pressure values; whereas it is determined unacceptable when the sum of press loading time is shorter than the predetermined one or when time in which press pressure exceeds the upper limit pressure is longer than a predetermined time.

Abstract: This seal check apparatus is mounted on a track press and checks the airtightness of a track joint immediately after the completion of assembly of a track chain using the track press. The apparatus comprises a base assembly mounted on the track press; a vacuum head which is engageable with and disengageable from the track joint on the track press; a member provided with freedom of displacement on the base assembly and supporting the vacuum head with freedom of displacement; a first actuating member provided on the base assembly and displacing the vacuum head supporting member; a second actuating member provided on the vacuum head supporting member and displacing the vacuum head; a gas system for sucking gases from the vacuum head when the latter engages the track joint; and a control member for controlling the operations of both actuating members and the gas system.

Abstract: A method and apparatus for feeding coolant to the interior of a connecting pin during build-up welding of a track link assembly, for protecting the peripheral seal members of the connecting pin from the welding heat, comprising a coolant charging and discharging adapter having a forcibly butting conical shaped end to be placed in contact with an opening in the lateral end face of the connecting pin and an elongate pipe for feeding a coolant through said adapter into said connecting pin interior. The coolant is removed continuously or intermittently during welding through an annular passageway formed in the adapter concentrically about the pipe, or through a passageway similarly formed by an insertion portion carried by said adapter.