An outrigger control device (A1) includes: a plurality of outriggers (30) that is provided in a traveling body (10) and extendable/contractible between a non-grounding state where the traveling body is not supported and a grounding state where the traveling body is supported; an inclination sensor (310) that is provided in the traveling body and can detect inclination of the traveling body; and a controller (100) that controls an extension/contraction action of each outrigger and acquires a detection signal of the inclination sensor (310). Further, the controller is provided with a grounding determination processing unit (101) that controls the outriggers to perform a predetermined grounding determination action and determines whether or not each outrigger is in the grounding state on the basis of the detected value of the inclination sensor at the time.

A trailer assembly includes first and second axles supporting first and second wheels which are coupled to first and second actuators of a steering system. The steering system includes a control circuit connected to the actuators and the control circuit includes a driving device configurable in a low speed maneuvering mode with: a synchronized sub-mode in which the actuators can be actuated in a synchronized manner to steer the wheels in a synchronized manner, and a desynchronized sub-mode in which the first and second actuators can be actuated individually and independently to steer only the first wheels or only the second wheels. A control device is connected to the driving device to: select one of the sub-modes in the low speed maneuvering mode, and select an actuation either of the first actuator or of the second actuator, in the desynchronized sub-mode.

A mobile crane includes: a lower traveling body including a pair of crawlers; an upper slewing body supported on the lower traveling body slewably about a slewing axis; a tiltable attachment including a boom tiltably supported on the upper slewing body; and a physical quantity detector. The lower traveling body has a reaction force receiving part for receiving a reaction force from the ground at a position away from the slewing axis in a boom direction in a state where the pair of crawlers are in contact with the ground, the boom direction coinciding with a horizontal component of a direction in which the boom extends from the upper slewing body, and the physical quantity detector detects a physical quantity which changes in accordance with a change in the reaction force received from the ground by the reaction force receiving part.

A mobile crane includes: a lower traveling body including a pair of crawlers; an upper slewing body supported on the lower traveling body slewably about a slewing axis; a tiltable attachment including a boom tiltably supported on the upper slewing body; and a physical quantity detector. The lower traveling body has a reaction force receiving part for receiving a reaction force from the ground at a position away from the slewing axis in a boom direction in a state where the pair of crawlers are in contact with the ground, the boom direction coinciding with a horizontal component of a direction in which the boom extends from the upper slewing body, and the physical quantity detector detects a physical quantity which changes in accordance with a change in the reaction force received from the ground by the reaction force receiving part.

Described is a self-propelled operating machine (1) equipped with stabilizers which comprise a front stabilizing unit (2), mounted on a chassis (100) of the machine (1), which is movable on wheels and is fitted with a driver's cab (12) for an operator (O).

The stabilizing unit (2) comprises a supporting frame (24) and two stabilizing arms (21, 22, 23), each of which includes a first segment (21) hinged to the frame (24) by a pin (25) located at a lower side of the first segment (21).

A vehicle crane having a lower carriage with a longitudinal axis and a superstructure that is rotatable about a vertical axis includes at least one base support and at least two side supports arranged on the lower carriage, where the base support and the side supports can be supported with respect to the ground. The two side supports are each arranged on the lower carriage via a support carrier and oppositely in relation to the longitudinal axis of the lower carriage, and precisely two side supports are arranged on the lower carriage. Each base support is arranged oppositely with respect to the two side supports in relation to the vertical axis and as seen in the direction of the longitudinal axis, and a rotary connection support for the superstructure is arranged on the lower carriage and the two support carriers are arranged remotely from the rotary connection support.

One embodiment of an outrigger footpad retainer system is described and depicted. The system may include a spider assembly that has an upper unit and a lower unit. The upper unit may have a retainer portion and two legs extending from the portion. The lower unit may have a retainer portion and two legs extending from the portion. The upper portion may at least partially overlap the lower portion.

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.

A safety device for a mobile crane has: a permitted work range setting unit that, in accordance with whether or not the overhang angle of each outrigger is a reference overhang angle and the overhang length is the maximum overhang length, sets the permitted work range/non-permitted work range of a crane boom; and a load-specific work range setting unit that, in accordance with whether or not each of the outriggers overhang lengths is a maximum overhang length, sets a maximum RTL work range which is a range, within the permitted work range, in which crane work at a maximum rated total load can be carried out. The crane work capacity on the side of the outrigger having the maximum hangover length with high supporting capacity can be fully utilized within a range over which safety can be ensured.