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Patent Searching and Data


Title:
POWER UNIT AND ELECTRIC TOOL
Document Type and Number:
WIPO Patent Application WO/2015/045161
Kind Code:
A1
Abstract:
A power unit (20) delivers hydraulic oil under pressure to an electric tool head (11) and drives the electric tool head (11), the electric tool head (11) having mounted thereto a piston for operating a tool. The power unit (20) is provided with a first power unit (20a) and a second power unit (20b). The first power unit (20a) has a first hydraulic pump (23a), a first motor (21a), and a first flow passage (e) which delivers the hydraulic oil under pressure from the first hydraulic pump (23a) to the electric tool head (11). The second power unit (20b) has a second hydraulic pump (23b), a second motor (21b), and a second flow passage (f) which delivers the hydraulic oil under pressure from the second hydraulic pump (23b) to the electric tool head (11). The power unit (20) is further provided with: a combining joint (12) for combining the first flow passage (e) and the second flow passage (f); a pressure restriction device (26) for restricting an increase in pressure in the first flow passage (e); and a return device (25) for discharging the hydraulic oil from the second flow passage (f) to thereby enable the return operation of the piston. As a result of this configuration, the discharge performance is enhanced, enabling the application of the power unit to multiple variations.

Inventors:
TATAI Tadashi (3039 Oaza-Sasaga, Matsumoto-sh, Nagano 21, 〒3998721, JP)
Application Number:
JP2013/076565
Publication Date:
April 02, 2015
Filing Date:
September 30, 2013
Export Citation:
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Assignee:
IZUMI PRODUCTS COMPANY (3039, Oaza-Sasaga Matsumoto-sh, Nagano 21, 〒3998721, JP)
International Classes:
B25B25/00
Foreign References:
JPH0663283U1994-09-06
JPS63169281U1988-11-04
JP2003200361A2003-07-15
JP2004076411A2004-03-11
JPS61216939A1986-09-26
JPH08150576A1996-06-11
Other References:
See also references of EP 3053705A4
Attorney, Agent or Firm:
ISONO Michizo (Sabo Kaikan Annex 7-4, Hirakawa-cho 2-chome, Chiyoda-k, Tokyo 93, 〒1020093, JP)
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