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US 6,318,478 B1Granted
Damper pressure control apparatus for hydraulic rock drill
AssigneeFurukawa Co., Ltd.
InventorTsutomu Kaneko
Life of this patent
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Abstract
A damper pressure control apparatus for a hydraulic rock drill is automatically adjustable of damper pressure to be applied to a damping piston depending upon a thrust of a rock drill body and makes damping function and floating function effective even when thrust of hydraulic rock drill is varied. The damper control apparatus is thus provides a damper pressure control for controlling the damper pressure (DPpr) to be applied to a damping piston (16, 17) from a hydraulic pressure source (21) based on the frontward thrust (F1) acting on the hydraulic rock drill body 1.
Claims1
In a hydraulic rock drill including:
- a striking mechanism striking a tool;
- a transmission member transmitting a thrust toward a crushing object to said tool;
- a damping piston provided at rear side of said transmission member and damping a reaction energy from said tool and said transmission member by said frontward thrust by a damper pressure from a hydraulic pressure source;
- and
- a damper pressure control apparatus comprising damper pressure control means for controlling said damper pressure applied to said damping piston from said hydraulic pressure source on the basis of a frontward thrust acting on a hydraulic rock drill.
2 more elements
Dependencies are inferred from the claim text.