Title:
PULSE WRENCH
Document Type and Number:
WIPO Patent Application WO/2005/099965
Kind Code:
A1
Abstract:
In a pulse wrench having a percussion pulse generating mechanism, it is intended to facilitate the processing of an oil passage which establishes communication between high and lower pressure chambers in one percussion pulse generating state which is established twice during one revolution of a cylinder. To this end, the invention establishes twice in one revolution of a cylinder (11) a percussion pulse generating state in which a high pressure chamber (H) and a low pressure chamber (L) are formed in a cylinder chamber (21) during one revolution of the cylinder by rotation of the cylinder (11) relative to an anvil (23), wherein in one percussion pulse generating state, communication between the high and low pressure chambers (H, L) is established by the oil passage so as to allow the operating oil in the high pressure chamber (H) to flow into the low pressure chamber (L), thereby eliminating the generation of percussion pulses. The oil passage is composed of two arcuate holes (32, 33) of different peripheral lengths formed in the rear cover (15) of the cylinder (11), four communication oil holes (34) communicating with the opposite ends of each of the arcuate holes (32, 33), and a communication passage (35) formed in the rotor (23a) of the anvil (23).
Inventors:
OKA MASATO (JP)
Application Number:
PCT/JP2004/005043
Publication Date:
October 27, 2005
Filing Date:
April 07, 2004
Export Citation:
Assignee:
NIPPON PNEUMATIC MFG (JP)
OKA MASATO (JP)
OKA MASATO (JP)
International Classes:
B25B21/02; (IPC1-7): B25B21/02
Domestic Patent References:
| WO1995035185A1 | 1995-12-28 |
Foreign References:
| US4854916A | 1989-08-08 | |||
| JPH0235681U | 1990-03-07 | |||
| US5741186A | 1998-04-21 |
Attorney, Agent or Firm:
Kamada, Bunji (Nipponbashi 1-chome Chuo-k, Osaka-shi Osaka, JP)
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