Title:
HYDRAULIC BOOSTER DEVICE
Document Type and Number:
Japanese Patent JP2021001656
Kind Code:
A
Abstract:
To provide a hydraulic booster device having a small, light and quiet structure.SOLUTION: A hydraulic booster device 1 includes: a hydraulic cylinder 4 having a changeover valve part 2 and a pressure boost part 3; a direction control part 7 having a first solenoid valve 5 and a direction switching valve 6; a pressure switch 8; and a manifold part 10 having a high pressure relief valve 9. The hydraulic booster device is configured such that: working fluid is fed from a pump P; the working fluid boosted in pressure by the hydraulic cylinder 4 is supplied to a hydraulic tool U; the high pressure relief valve 9 is operated and the pressure switch 8 is operated when the pressure of the working fluid reaches predetermined high pressure; the working fluid supplied to the hydraulic tool U is discharged to a tank T; a flow rate is restricted when the working fluid from a first flow passage 5e formed in the first solenoid valve 5 is caused to flow through a second flow passage 6e formed in the direction switching valve 6 toward a second spool 6b; and the flow rate is restricted when the working fluid from a third flow passage 5f formed in the first solenoid valve 5 is caused to flow through a fourth flow passage 6f formed in the direction switching valve 6 toward the second spool 6b.SELECTED DRAWING: Figure 1
Inventors:
MIZUKOSHI TAKAYUKI
NAKAJIMA SHIGETO
KOYAMA SHOGO
NAKAJIMA SHIGETO
KOYAMA SHOGO
Application Number:
JP2019115467A
Publication Date:
January 07, 2021
Filing Date:
June 21, 2019
Export Citation:
Assignee:
NISHINA KOGYO KK
International Classes:
F15B11/028; F15B3/00
Domestic Patent References:
| JP3579546B2 | 2004-10-20 | |||
| JP2014020431A | 2014-02-03 | |||
| JP2009287648A | 2009-12-10 | |||
| JP2018511760A | 2018-04-26 | |||
| JP2017223334A | 2017-12-21 |
Attorney, Agent or Firm:
Watanuki International Patent and Trademark Office