Abstract: A lift arm having a plate-like structure that is capable of taking a large load is realized without increasing a plate thickness and at low cost. The structure with required strength and of low cost is realized by a simple construction and achieves, at the same time, both weight lightening of a loader and sufficient load bearing performance. In a loader (2) of a working machine (1), connection sections between a cross member (176) and lift arms (171) are each formed in a shape broadening from the cross member (176) toward a lift arm (171). Further, reinforcement plates are attached to outer surfaces of a front loader (2) so as to overlap the connection sections between the cross member (176) and the lift arms (171). Contact members (171b, 171b) are attached to lower side faces at the heads of the lift arms (171) to restrict the amount of rotation of a working device installed on the heads of the lift arms (171).

Abstract: There is provided a piping structure of a front work machine which prevents an increase in total with of the front work machine caused by hydraulic piping extended from the main machine side, and enables the piping following a structure of the front work machine turning vertically, by which a burden on the hydraulic piping accompanying the turning of the front work machine can be reduced to improve the durability.

Abstract: A lock device is improved in durability by operating the operation member of a boom lock device in a non-contact state to solve a problem in a conventional work machine because there is a problem that the operation member is worn at the lateral rotating part of a boom bracket. In the lock device 51 for locking a boom 16 of the excavating device to the main body, an engaging member is provided on one of the boom and a boom bracket 15 provided on the main body, and an engaged member is provided on the other of the boom and the boom bracket. The engaging member is constituted by a plate formed on one side thereof with a hook part 52a, and on the other side thereof with a slot 52c. A support pin 55 is inserted into the slot, and a stopped 53 is disposed above the support pin, so that the support pin 55 and the stopper 53 support the engaging member.

Abstract: A cylinder is interposed between a machine frame and each of outriggers, which are vertically swingably disposed at opposite sides of the machine frame, so as to lift up and down the outrigger. Fluid passages are formed in a rod part of the hydraulic cylinder. Connection portions of fluid suction and delivery ports of the respective fluid passages to be connected to the respective hydraulic pressure hoses are disposed adjacent to a pivot of the hydraulic cylinder.

Abstract: There is provided a piping structure of a front work machine which prevents an increase in total width of the front work machine caused by hydraulic piping extended from the main machine side, and enables the piping following a structure of the front work machine turning vertically, by which a burden on the hydraulic piping accompanying the turning of the front work machine can be reduced to improve the durability. In the piping structure of the front work machine mounted on the main machine through a bracket(s) 7 as a turnably-supporting part(s) arranged on one side of a bonnet provided in a front portion of the main machine or both right and left sides, each of lift arms 11 or a lift arm 11, which is a constructional member of the front work machine, is provided with a hole part 20 through which the hydraulic piping 30 passes.

Abstract: A lock device is improved in durability by operating the operation member of a boom lock device in a non-contact state to solve a problem in a conventional work machine because there is a problem that the operation member is worn at the lateral rotating part of a boom bracket. In the lock device 51 for locking a boom 16 of the excavating device to the main body, an engaging member is provided on one of the boom and a boom bracket 15 provided on the main body, and an engaged member is provided on the other of the boom and the boom bracket. The engaging member is constituted by a plate formed on one side thereof with a hook part 52a, and on the other side thereof with a slot 52c. A support pin 55 is inserted into the slot, and a stopped 53 is disposed above the support pin, so that the support pin 55 and the stopper 53 support the engaging member.

Abstract: A simple and compact loader having a sufficient strength with brackets fixed on a working vehicle. Lift arms are pivoted at one ends thereof to respective brackets so as to be vertically swung by respective lift arm cylinders. Attachments are vertically swingably supported on respective tip portions of the lift arms. Bucket links are connected to the respective attachments so as to transmit the telescopic action of bucket cylinders. Each of the bucket links is offset laterally from each of the lift arms. The middle portion of each of the lift arms is disposed above a straight line connecting both ends of the lift arm to each other, so as to ensure a space for arranging a steerable wheel under the lift arm.

Abstract: A stabilizer installed on a work vehicle to hold the stability of a vehicle body in excavating operation and capable of preventing the ground-contact surface of a stabilizer pad from being inverted upward when the attitude of the stabilizer pad installed at the outer tip of the vehicle body is not stabilized. A balancer 25 is fitted to the end of the stabilizer pad 30. A downward moment always acts on the stabilizer pad 30 about a stabilizer pad pivot 26 (direction of solid arrow ? in the figure) by the weight of the balancer 25. Thus, the stabilizer pad 30 can always keep its attitude with its ground-contact surface facing downward irrespective of the vertical rotation of a leg body 23.

Abstract: A lift arm having a plate-like structure that is capable of taking a large load is realized without increasing a plate thickness and at low cost. The structure with required strength and of low cost is realized by a simple construction and achieves, at the same time, both weight lightening of a loader and sufficient load bearing performance. In a loader (2) of a working machine (1), connection sections between a cross member (176) and lift arms (171) are each formed in a shape broadening from the cross member (176) toward a lift arm (171). Further, reinforcement plates are attached to outer surfaces of a front loader (2) so as to overlap the connection sections between the cross member (176) and the lift arms (171). Contact members (171b, 171b) are attached to lower side faces at the heads of the lift arms (171) to restrict the amount of rotation of a working device installed on the heads of the lift arms (171).

Abstract: A structure of a hydraulic cylinder of an outrigger should be improved to prevent a hydraulic pressure hose from being damaged, and an arrangement of the hydraulic cylinder should be improved to prevent a rod part of the hydraulic cylinder from being damaged. A cylinder (40) is interposed between a machine frame and each of outriggers (10), which are vertically swingably disposed at opposite sides of the machine frame, so as to lift up and down the outrigger. Fluid passages (54a and 54b) are formed in a rod part (40b) of the hydraulic cylinder (40). Connection portions of fluid suction and delivery ports of the respective fluid passages (54a and 54b) to be connected to the respective hydraulic pressure hoses (51a and 52b) are disposed adjacent to a pivot of the hydraulic cylinder (40).

Abstract: A simple and compact loader having a sufficient strength with brackets fixed on a working vehicle. Lift arms are pivoted at one ends thereof to respective brackets so as to be vertically swung by respective lift arm cylinders. Attachments are vertically swingably supported on respective tip portions of the lift arms. Bucket links are connected to the respective attachments so as to transmit the telescopic action of bucket cylinders. Each of the bucket links is offset laterally from each of the lift arms. The middle portion of each of the lift arms is disposed above a straight line connecting both ends of the lift arm to each other, so as to ensure a space for arranging a steerable wheel under the lift arm.