Title:
ELECTRIC TOOL
Document Type and Number:
WIPO Patent Application WO/2022/249945
Kind Code:
A1
Abstract:
The present invention is configured such that oil pressure can be rapidly increased and working time reduced while suppressing the load on a motor, an electric tool (1) comprises a body part (2) in which a hydraulic pump (7) for delivering hydraulic oil (3a) to a cylinder part (4) and a motor (8) for driving the hydraulic pump (7) are arranged, and a tool head (9) operated by the pressing force of a piston (4a) in a state of being connected to the body part (2), and the hydraulic pump (7) is configured such that a swash plate cam (7a) connected to a drive shaft (8a) of the motor (8), a first plunger (11) and a second plunger (12) which are arranged around an axis line (P1) passing through the drive shaft (8a) in the cylinder part (4) and reciprocate while contacting the swash plate cam (7a), and a check valve (15) that opens by a first pressure on a secondary side of the first plunger (11) are arranged in the hydraulic pump (7), and a first amount of liquid delivery by the first plunger (11) is increased relative to a second amount of liquid delivery by the second plunger (12) until the first pressure is attained.
Inventors:
KAMIJO KEIICHIRO (JP)
KOCHIYAMA KATSUTOSHI (JP)
KOCHIYAMA KATSUTOSHI (JP)
Application Number:
PCT/JP2022/020639
Publication Date:
December 01, 2022
Filing Date:
May 18, 2022
Export Citation:
Assignee:
MAXELL IZUMI CO LTD (JP)
International Classes:
B25F5/00; B25B25/00; F04B1/182
Domestic Patent References:
| WO2019111390A1 | 2019-06-13 |
Foreign References:
| JP2018086696A | 2018-06-07 | |||
| CN208051839U | 2018-11-06 | |||
| KR200378195Y1 | 2005-03-10 | |||
| US20130264085A1 | 2013-10-10 | |||
| JP2018086696A | 2018-06-07 |
Attorney, Agent or Firm:
WATANUKI PATENT SERVICE BUREAU (JP)
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