Title:
CUSHIONING MECHANISM FOR HYDRAULIC STRIKING DEVICE
Document Type and Number:
Japanese Patent JP3483015
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To improve striking efficiency by cushioning reflected energy from a shank rod with oil pressure so as to reduce damage, and advancing a bit so as to be in contact with a rock-bed to strike even in the case of a rock drill body failing to advance into a specified position by the next striking time after once retreating due to the thrust shortage of the rock drill body.
SOLUTION: A rock drill is provided with striking mechanism for striking a shank rod 2, and a chuck driver bush 13 for transmitting thrust to the crushed object side to the shank rod 2. In this rock drill, a front damping piston 4 smaller in thrust than a rock drill body 1, and a rear damping piston 5 larger in thrust than the rock drill body 1 are disposed behind the chuck driver bush 13.
Inventors:
Tsutomu Kaneko
Application Number:
JP26719695A
Publication Date:
January 06, 2004
Filing Date:
October 16, 1995
Export Citation:
Assignee:
Furukawa Metal Co., Ltd.
International Classes:
B25D9/26; B25D9/14; B25D17/24; E21B1/00; E21B1/02; E21B1/26; E21B1/38; E21B6/00; (IPC1-7): B25D9/26; E21B1/26
Domestic Patent References:
| JP55380A | ||||
| JP5295977U |
Attorney, Agent or Firm:
Tetsuya Mori (2 others)