Abstract: A track frame in which stress concentration caused by a work load is avoided and that has increased strength. These are achieved by reducing the weigh of connection legs and providing sufficient welding length for joint surfaces for joining the connection legs. The track frame has a front and rear pair of left/right connection legs (61, 71) joined to a center frame (30) and side frames (7) to connect the center and side frames (30, 7). Each of the connection legs (61, 71) has a body part (62, 72) formed in a tubular shape, a center joint part (63, 73) formed at one opening edge of the body part (62, 72) and joined to the center frame (30), and a side joint part (64, 74) formed at the other opening edge of the body part (62, 72) and joined to a side frame (7). The center joining parts (63, 73) are flush with or projected from the upper surface of the center frame (30).

Abstract: A track frame in which stress concentration caused by a work load is avoided and that has increased strength. These are achieved by reducing the weigh of connection legs and providing sufficient welding length for joint surfaces for joining the connection legs. The track frame has a front and rear pair of left/right connection legs (61, 71) joined to a center frame (30) and side frames (7) to connect the center and side frames (30, 7). Each of the connection legs (61, 71) has a body part (62, 72) formed in a tubular shape, a center joint part (63, 73) formed at one opening edge of the body part (62, 72) and joined to the center frame (30), and a side joint part (64, 74) formed at the other opening edge of the body part (62, 72) and joined to a side frame (7). The center joining parts (63, 73) are flush with or projected from the upper surface of the center frame (30).

Abstract: A boom assembly includes a hollow bent boom pivotally connected to a swing bracket, a hollow arm pivotally connected to a leading end of the boom and pivotally supporting an implement at a leading end of the arm, a pair of right and left connecting brackets attached to opposed side faces of a base end of the arm, an implement cylinder provided between the implement and the connecting brackets for operating the implement, a hydraulic service port for a hydraulic implement, and a hydraulic oil pipe for supplying pressure oil to the implement cylinder and the hydraulic service port. The hydraulic service port is provided in the connecting brackets and the hydraulic oil pipe extends through the inside of the hollow boom to be exposed to the outside from a back face area of the leading end of the boom and then further extends between the pair of right and left connecting brackets.

Abstract: A boom assembly includes a hollow bent boom pivotally connected to a swing bracket, a hollow arm pivotally connected to a leading end of the boom and pivotally supporting an implement at a leading end of the arm, a pair of right and left connecting brackets attached to opposed side faces of a base end of the arm, an implement cylinder provided between the implement and the connecting brackets for operating the implement, a hydraulic service port for a hydraulic implement, and a hydraulic oil pipe for supplying pressure oil to the implement cylinder and the hydraulic service port. The hydraulic service port is provided in the connecting brackets and the hydraulic oil pipe extends through the inside of the hollow boom to be exposed to the outside from a back face area of the leading end of the boom and then further extends between the pair of right and left connecting brackets.

Abstract: In a testing method and a testing circuit design apparatus for a multi-terminal device, the testing circuit design apparatus includes an input unit for inputting data of an ideal testing circuit, a storage unit for storing the data of the ideal testing circuit input from the input unit, a knowledge base unit having a knowledge base in which a knowledge base and a testing method suitable for a tester of each manufacturer are described, and a testing circuit conversion unit for converting the data of the ideal testing circuit written in the storage unit to data of an actual testing circuit actually used for characteristic measurement on the basis of each knowledge base of the knowledge base unit, and for writing the converted data into the storage unit. The number n of points under test of the device board and the number M of resources of the tester are read out, and the number n of the points under test and the number M of the resources are compared with each other.