Title:
LIQUID PRESSURE IMPACT DEVICE
Document Type and Number:
Japanese Patent JPS5635801
Kind Code:
A
Abstract:
A hydraulic percussion apparatus comprising a body, a cylinder in the body and a percussion piston reciprocating in the cylinder. A distributing valve moves in a valve housing. A valve for starting and stopping the percussion apparatus is provided. A hydraulic pump and hydraulic channels form a percussion circuit with a gas/liquid pressure accumulator. A distributing valve circuit and a free circulation circuit are provided for the pump which are parallelly coupled with the percussion circuit, which circuits are connected to the pump and to the start-and-stop valve which has positions for controlling pressure in the circuits. The start-and-stop valve has a middle position during which pressure in the percussion circuit rises up to a predetermined value while the distributing valve circuit remains closed independent of the pressure in the percussion circuit.
Inventors:
ESA KAARU
PETSUKA SARUMI
HANNU PAAZONEN
PETSUKA SARUMI
HANNU PAAZONEN
Application Number:
JP8530980A
Publication Date:
April 08, 1981
Filing Date:
June 25, 1980
Export Citation:
Assignee:
TAMPELLA OY AB
International Classes:
B25D9/12; B25D9/14; B30B5/00; B25D9/04; B30B15/18; E21B1/26; (IPC1-7): B30B5/00; B30B15/18; F15B11/02