Title:
ハンマ装置
Document Type and Number:
Japanese Patent JP4625581
Kind Code:
B2
Abstract:
A hammer device has a machine housing (1) with a hammer piston (2) movable to-and-fro. The to-and-fro movement of the hammer piston is controlled by a valve body (6) movable to-and-fro in the machine housing. The valve body, via a channel (7), alternatively connects a drive surface (5) on the hammer piston to a pressure source (8) and to low pressure (9). In order to expedite the actuation of the hammer piston at its rear dead center, the machine housing has a room (10) which is separated from the channel (7) by the hammer piston at the same time that the valve body (6) maintains the pressure from the pressure source (8) on the rear end surface (5) of the hammer piston.
Inventors:
Anderson, Kurt
Rodart, Jorgen
Rodart, Jorgen
Application Number:
JP2000544473A
Publication Date:
February 02, 2011
Filing Date:
April 07, 1999
Export Citation:
Assignee:
Atlas Copco Rock Drills Activolag
International Classes:
B25D9/14; E21B1/00; E21B1/26; E21C25/04
Domestic Patent References:
| JP5116076A | ||||
| JP63312082A | ||||
| JP3228584A | ||||
| JP6058073A | ||||
| JP2298476A |
Attorney, Agent or Firm:
Takao Hamano
Teruichi Hirai
Teruichi Hirai