Title:
CYLINDER UNIT WITH BOOSTER AND OIL PRESSURE CIRCUIT FOR OPERATING THE SAME
Document Type and Number:
Japanese Patent JPS58102804
Kind Code:
A
Abstract:
PURPOSE:To obtain smooth operations of booster and rods by a method wherein a piston chamber in a main cylinder is communicated with the external in a state in which a piston mounted slidably on a booster cylinder is moved to the left end position. CONSTITUTION:When a booster changeover valve 36 i switched by the changeover of limit valves 22 and 25, a piston 16 and a rod move reciprocatively in the leftward and rightward direction so that a piston 12 and a rod 11 are moved by a high pressure. In order to contract the rod 11, a main changeover valve 34 is changed over to connect a pump 30 to an oil passage (b) and a tank 31 to an oil passage (a) respectively. At this time a left chamber in the booster cylinder 9b is led to the tank 31 and a right chamber is led with a starting pressure to move the piston 16 and rod 15 to the left end position, so that a hole 20 opens to a port 21 so as to connect the left chamber of a main cylinder 9a to the tank 31.
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Inventors:
OKADA HIROSHI
Application Number:
JP20074281A
Publication Date:
June 18, 1983
Filing Date:
December 11, 1981
Export Citation:
Assignee:
NIHON NUMBER PLATE KK
International Classes:
E02F3/36; F15B11/028; F15B11/032; (IPC1-7): E02F3/36; F15B3/00; F15B11/02
Domestic Patent References:
| JPS3526536Y1 | ||||
| JPS4824991A | ||||
| JP49147492B | ||||
| JP55089801B | ||||
| JP54069292B |
Attorney, Agent or Firm:
Hashizume Eiya