Hitachi Sumitomo Heavy Industries Construction Crane Co., Ltd.
|Hitachi Sumitomo Heavy Industries Construction Crane Co., Ltd. Patent applications|
|Patent application number||Title||Published|
|20130311051||Control Device For Hydraulic Winch - A control device for a hydraulic winch includes: a hydraulic source; a variable-displacement hydraulic motor; a winch operation member; an accelerator operation quantity detection unit; an engine control unit; a rotation speed detection unit; a line pull detection unit; a condition decision unit; and a motor displacement control unit, wherein: once the condition decision unit decides that the fuel-efficient, high-speed operation condition has been established, the engine control unit sets an upper limit to the engine rotation speed at a predetermined rotation speed, lower than the maximum rotation speed.||11-21-2013|
|20110155681||Counterweight Suspension Device and Mobile Crane - A counterweight suspension device includes: a pair of suspension cylinders that suspends a counterweight, and that are hung from a first and a second hanging points provided separately in a left and right direction at a top end of a rear mast; a coupling member that couples cylinder rod ends of the pair of suspension cylinders with each other; a lifting member for lifting the counterweight, that connects a first and a second connection points of the counterweight with each of the cylinder rod ends of the pair of suspension cylinders, with the first and the second connection points provided separately in the left and right direction on the counterweight for attaching the lifting member to the counterweight; a first communication circuit through which rod chambers of the pair of suspension cylinders communicate with each other; and a second communication circuit through which bottom chambers of the pair of suspension cylinders communicate with each other.||06-30-2011|
|20100213155||Rotating Superstructure and Crane - A rotating superstructure includes: a front block on which a power unit that includes a prime mover; and a rear block on which a unit for raising and lowering a boom that includes a winch, a, and an arm. And the rotating superstructure is configured to be split into the front block and the rear block.||08-26-2010|
|20080253875||Installation Device for Counterweight - A counterweight installation device includes: a weight support unit provided on a rear end of a body frame of a construction machine; a weight mounting unit disposed on a counterweight; a pin member for mounting the counterweight adapted to move between a first position at which the weight mounting unit is mounted on the weight support unit and a second position at which the weight mounting unit is dismounted from the weight support unit; and a rod device, one end of which is linked with the pin member and an other end of which extends so as to project to an outside of the counterweight, adapted to move the pin member between the first position and the second position by operation at the other end thereof.||10-16-2008|
Patent applications by Hitachi Sumitomo Heavy Industries Construction Crane Co., Ltd.