Abstract: An attachment mounting and demounting apparatus includes: a fixed frame that has a first hook; a movable frame that has a second hook and is rotatably provided to the fixed frame; a first hydraulic cylinder that rotates the movable frame relative to the fixed frame; a back locking member provided to the fixed frame; a second hydraulic cylinder provided to the fixed frame to rotate the back locking member biased to a locked position by a lock spring, to an unlocked position; a front locking member provided to the movable frame and biased to a locked position by a lock spring; and a third hydraulic cylinder provided to the movable frame to rotate the front locking member to an unlocked position.

Abstract: A turning working vehicle is provided with a monitor arrangement structure where a driver's seat is arranged on an operation part disposed on a turning body, and a working part manipulation lever which manipulates a working part and a monitor which displays various information are disposed on either one of left and right sides of the driver's seat. The monitor is arranged in an upright state outside and in front of the working part manipulation lever, and a display screen of the monitor is directed toward a viewpoint side of an operator seated on the driver's seat and performing manipulation while viewing a front side. An outer manipulation lever is arranged in an upright state behind the monitor thus allowing the operator to view the display screen of the monitor between the outer manipulation lever and the working part manipulation lever within a field of vision of the operator.

Abstract: A turning working vehicle is provided with a monitor arrangement structure where a driver's seat is arranged on an operation part disposed on a turning body, and a working part manipulation lever which manipulates a working part and a monitor which displays various information are disposed on either one of left and right sides of the driver's seat. The monitor is arranged in an upright state outside and in front of the working part manipulation lever, and a display screen of the monitor is directed toward a viewpoint side of an operator seated on the driver's seat and performing manipulation while viewing a front side. An outer manipulation lever is arranged in an upright state behind the monitor thus allowing the operator to view the display screen of the monitor between the outer manipulation lever and the working part manipulation lever within a field of vision of the operator.

Abstract: In a boom 15 for a working machine 10 attached to an upper rotational body 30 supported on a center of an upper portion of a crawler-type traveling device 40 to be transversely rotatable, the boom 15 includes, as portions cast by integral molding, a boom support point part 16, a boom cylinder rod support point part 18, and an arm support point part 19, and is configured so that the boom support point part 16 is connected to the boom cylinder rod support point part 18 by a general-purpose first rectangular pipe 61, and so that the boom cylinder rod support point part 18 is connected to the arm support point part 19 by a general-purpose second rectangular pipe 62.

Abstract: It is an object of the present invention to provide a cover for a power shovel which can be manufactured at a low cost by reducing the number of parts and production man-hours and can be improved in maintainability. In the power shovel 50 which include an upper revolution structure (10) having: a body frame (11), a seat support stand (13) disposed at the rear of the body frame (11) and covering an upper part of the engine, and a device frame (12) disposed on a front part of the body frame (11) and storing hydraulic devices, side and a rear parts of the seat support stand (13) and the side part between the device frame (12) and the body frame (11) are covered by left and right side-covers (14) and (15) and a rear cover (16).

Abstract: An objective of the present invention is to provide a counterweight of a power shovel interchangeable with that of a superordinate model without affecting a rear end radius of the shovel at the time of rotation. In the power shovel 50 in which the counterweight is formed at the rear part of a vehicle body frame 11 extended from a front end to a rear end of a lower part of a rotation upper body 10, and an engine 14 is mounted on the rear part of the vehicle body frame 11, an additional weight 12 is placed in a space between the rear part of the vehicle body frame 11 and the engine 14.

Abstract: An object of the present invention is to reduce manufacturing cost and manufacturing man-hour of an arm constituting a working machine in an excavation machine. In an arm 20 of a working machine 10 attached to an upper rotational body 30 supported on a center of an upper portion of a crawler-type traveling device 40 to be transversely rotatable, the arm 20 includes, as portions cast by integral molding, an arm support point part 21, a bucket support point part 24, and a bucket cylinder bottom support point part 22, and is configured so that the arm support point part 21 is connected to the bucket support point part 24 by a general-purpose rectangular pipe 28 and so that the bucket cylinder bottom support point part 22 is fixedly provided on an upper surface of the general-purpose rectangular pipe 28.

Abstract: An objective of the present invention is to provide a counterweight of a power shovel interchangeable with that of a superordinate model without affecting a rear end radius of the shovel at the time of rotation. In the power shovel 50 in which the counterweight is formed at the rear part of a vehicle body frame 11 extended from a front end to a rear end of a lower part of a rotation upper body 10, and an engine 14 is mounted on the rear part of the vehicle body frame 11, an additional weight 12 is placed in a space between the rear part of the vehicle body frame 11 and the engine 14.

Abstract: It is an object of the present invention to provide a cover for a power shovel which can be manufactured at a low cost by reducing the number of parts and production man-hours and can be improved in maintenability. In the power shovel 50 which include an upper revolution structure (10) having: a body frame (11), a seat support stand (13) disposed at the rear of the body frame (11) and covering an upper part of the engine, and a device frame (12) disposed on a front part of the body frame (11) and storing hydraulic devices, side and a rear parts of the seat support stand (13) and the side part between the device frame (12) and the body frame (11) are covered by left and right side-covers (14) and (15) and a rear cover (16).

Abstract: In a boom 15 for a working machine 10 attached to an upper rotational body 30 supported on a center of an upper portion of a crawler-type traveling device 40 to be transversely rotatable, the boom 15 includes, as portions cast by integral molding, a boom support point part 16, a boom cylinder rod support point part 18, and an arm support point part 19, and is configured so that the boom support point part 16 is connected to the boom cylinder rod support point part 18 by a general-purpose first rectangular pipe 61, and so that the boom cylinder rod support point part 18 is connected to the arm support point part 19 by a general-purpose second rectangular pipe 62.

Abstract: A pair of supported portions are provided in a bifurcated manner on the base end of the boom of a work machine. Operation oil hoses for an arm cylinder and operation oil hoses for a bucket cylinder are guided and piped into the boom from between both the supported portions. A hose guide hole is provided below each of the boom support portions so that operation oil hoses for the boom cylinder are inserted into the respective hose guide holes. At an intermediate portion of the rear surface of the boom, the operation oil hoses are taken out from the inside of the boom through a hose attachment plate and connected to respective external hoses connected to the arm cylinder. At a tip end of the boom, the operation oil hoses are pulled out from the inside of the boom through a rear side inclined surface of an angle rib.

Abstract: A cabin of a rearward small-turn backhoe having a portion of a turn frame (2) excluding a working machine mounting part (1) formed generally in circular shape and formed so that the diameter thereof is stored generally within the width of a traveling device (1), wherein the rear part of the cabin (8) is formed in a curved shape generally along the outer peripheral form of the turn frame (2) as viewed from a horizontal plane, at least a side face of the cabin is formed in a polygonal shape, and two faces of the polygonal shape adjacent to each other are formed in a foldable door (15a, 15b), whereby an indoor space can be increased over a conventional one to improve comfortability, and a controllability can be improved because a lever operation can be performed in a roomy space.

Abstract: A cabin of a rearward small-turn backhoe having a portion of a turn frame (2) excluding a working machine mounting part (1) formed generally in circular shape and formed so that the diameter thereof is stored generally within the width of a traveling device (1), wherein the rear part of the cabin (8) is formed in a curved shape generally along the outer peripheral form of the turn frame (2) as viewed from a horizontal plane, at least a side face of the cabin is formed in a polygonal shape, and two faces of the polygonal shape adjacent to each other are formed in a foldable door (15a, 15b), whereby an indoor space can be increased over a conventional one to improve comfortability, and a controllability can be improved because a lever operation can be performed in a roomy space.