An upper turning body mounted on a lower body for a crane includes a turning frame mounted on the lower body to turn freely, and a boom provided to the turning frame to be raised and lowered freely. The turning frame includes a pair of attachment brackets to which a base end section of the boom is attached such that the boom is free to be raised and lowered, and a frame body to which the pair of attachment brackets are provided with an interval in a left-right direction of the upper turning body. The frame body is formed of a plurality of divided frames arranged side by side in the left-right direction of the upper turning body, adjacent divided frames of the plurality of divided frames being separably joined to each other.

A crawler crane includes: a seating switch that detects whether an operator is in a driver seat; a turn angle potentiometer that detects the turn position of a boom; and a controller. The controller is provided with a boom turn restriction control unit for performing a boom turn-restricting control whereby the boom is not allowed to turn within a predetermined angular range above the driver seat on the basis of the output from the turn angle potentiometer. The boom turn restriction control unit includes a restriction-canceling unit that cancels the boom turn-restricting control performed by a turn-restricting unit if a preset restriction-canceling condition is met. The boom turn restriction control unit cancels the boom turn-restricting control if the seating switch does not detect an operator. Ease of operation and work can thus be improved in a remote operation mode and the like.

A crawler crane includes: a seating switch that detects whether an operator is in a driver seat; a turn angle potentiometer that detects the turn position of a boom; and a controller. The controller is provided with a boom turn restriction control unit for performing a boom turn-restricting control whereby the boom is not allowed to turn within a predetermined angular range above the driver seat on the basis of the output from the turn angle potentiometer. The boom turn restriction control unit includes a restriction-canceling unit that cancels the boom turn-restricting control performed by a turn-restricting unit if a preset restriction-canceling condition is met. The boom turn restriction control unit cancels the boom turn-restricting control if the seating switch does not detect an operator. Ease of operation and work can thus be improved in a remote operation mode and the like.

The invention provides a knuckle boom loader having a knuckle boom, an operator seat, and a hydraulic system. The hydraulic system comprises a hydraulic fluid reservoir, a hydraulic pump, and hydraulic fluid lines. The knuckle boom loader further comprises an operator elevator having an elevator platform. The operator elevator has both a lowered position and a raised position. The elevator platform is closer to the operator seat when the operator elevator is in the raised position than when the operator elevator is in the lowered position. Also provided are methods for operating such a loader.

A system and method for indicating to an operator a forward direction of travel of a machine having a ground-engaging traveling device, a superstructure rotatably mounted to the traveling device and an operator station defining an operator point of view are provided. The system includes a system controller, a rotation-sensing system connected to the system controller for determining a rotational relationship of the superstructure with respect to the traveling device, and a singaler mounted to the operator station and connected to the system controller for indicating to the operator the forward direction of travel of the machine in accordance with the operator point of view. The method includes receiving a rotational relationship of the superstructure with respect to the traveling device, and indicating to the operator the forward travel direction of the machine in accordance with the operator point of view.

A mobile crane, such as a crawler crane, including an undercarriage having a chassis and a superstructure rotatably supported on the undercarriage and having a pivotable boom. At least two platforms are permanently arranged at the superstructure via which the superstructure is walkable. The platforms each comprise a base and a railing that are movable from a transport position in which they contact the superstructure into a work position in which the bases are walkable and are secured by the railings, and vice versa.

A mobile crane, such as a crawler crane, including an undercarriage having a chassis and a superstructure rotatably supported on the undercarriage and having a pivotable boom. At least two platforms are permanently arranged at the superstructure via which the superstructure is walkable. The platforms each comprise a base and a railing that are movable from a transport position in which they contact the superstructure into a work position in which the bases are walkable and are secured by the railings, and vice versa.

A work machine includes a lower traveling body, an upper swing body swingably mounted on the lower traveling body, a work device attached to the upper swing body, a hook attached to the distal end of the work device, an acquisition device configured to acquire information on the conveying destination of a suspended load to be suspended from the hook, and an imaging device attached to the upper swing body and configured to acquire image information related to a situation in an area in front of, behind, and beside the upper swing body. The situation includes the state of the suspended load. The work machine is configured to automatically convey the suspended load to the conveying destination by causing at least one of the lower traveling body, the upper swing body, and the work device to operate.

A hydraulic excavator includes a revolving frame forming a support structure, a cab that is disposed to be positioned on a front side of the revolving frame and in which an operator gets, and a plurality of vibration isolating members that are disposed between the revolving frame and the cab to support the cab on the revolving frame in a vibration isolating state. Further, an intermediate connecting member is disposed for connection between the revolving frame and the vibration isolating member and for a height position adjustment of the cab to the revolving frame. The intermediate connecting member is fixed to the revolving frame from a lower side.

A hydraulic excavator includes a revolving frame forming a support structure, a cab that is disposed to be positioned on a front side of the revolving frame and in which an operator gets, and a plurality of vibration isolating members that are disposed between the revolving frame and the cab to support the cab on the revolving frame in a vibration isolating state. Further, an intermediate connecting member is disposed for connection between the revolving frame and the vibration isolating member and for a height position adjustment of the cab to the revolving frame. The intermediate connecting member is fixed to the revolving frame from a lower side.