| 摘要 |
PROBLEM TO BE SOLVED: To provide a compact hydraulic swivel drive for a two-shell grab. SOLUTION: This hydraulic swivel drive has two swivel shafts 8 and 9, and a shaft drive piece 12. The swivel shafts 8 and 9 are mutually rotatably supported in parallel in a shell carrier 1, and a grab arm is connected to these end parts. The shaft drive piece 12 is movably supported in the parallel direction to the swivel shafts 8 and 9, and is joined to the swivel shafts 8 and 9 via a screw part. Thus, the swivel shafts 8 and 9 are constituted so as to rotate in both opposite directions in response to the movement of the shaft drive piece 12. At least one hydraulically driven type plunger piston 15 and 16 is arranged for moving the shaft drive piece 12. COPYRIGHT: (C)2005,JPO&NCIPI
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