Title:
HYDRAULIC IMPACT DEVICE WITH CONTINUOUSLY CONTROLLABLE IMPACT RATE AND IMPACT FORCE
Document Type and Number:
Japanese Patent JP3419591
Kind Code:
B2
Abstract:
PURPOSE: To change the number of the hammering of a hammering piston and impact force in a continuously at fixed efficiency by changing over pressure load to a piston ring by a rotary slide valve to a mode in the revolution of a motor.
CONSTITUTION: Control openings 31-36 changed over to a mode in the revolution of a rotary engine 16 are formed between a rotary slide valve 15 and a control bush, while the rotary slide valve 15, a pump connection 21, a tank connection 23 and a percussion piston 25 are connected with pipelines 20, 22, 24. A surface A2 of a piston ring 26 for the hammering piston 25 is formed in size larger than that A1 of the piston ring 28. The hammering piston 25 is positioned at an upper section by loading pressure from the pump connection 21 to the surface A1 via the pipeline 20. When the rotary slide valve 15 is turned by the rotary engine 16, the surface A2 is pressed, the hammering piston 25 is driven to a lower section, and pressure removing openings 28 formed on both sides of the piston ring 28 are opened, and the hammering piston 25 is returned to an upper place, and the hammering piston 25 is reciprocated.
Inventors:
Dieter Guyude
Application Number:
JP13537995A
Publication Date:
June 23, 2003
Filing Date:
June 01, 1995
Export Citation:
Assignee:
Daleman-Honey Geselsyaft Mito Besilenktel Haftung
International Classes:
B25D9/14; B25D9/22; E21B17/00; B25D9/26; B25D17/26; E21B6/00; E21B6/02; E21B44/00; E21B44/06; (IPC1-7): E21B6/00; B25D9/22
Other References:
【文献】西独国特許出願公開4328278(DE,A1)
【文献】英国特許出願公開2008187(GB,A)
【文献】米国特許1946989(US,A)
【文献】米国特許4784228(US,A)
【文献】英国特許出願公開2008187(GB,A)
【文献】米国特許1946989(US,A)
【文献】米国特許4784228(US,A)
Attorney, Agent or Firm:
Mitsufumi Esaki (2 others)