Title:
POWER RATCHET WRENCH
Document Type and Number:
WIPO Patent Application WO/2008/018221
Kind Code:
A1
Abstract:
A power ratchet wrench in which conventional bearings and a crankshaft can be used
and with which bolts and nuts can be manually tightened and loosened without applying
an excessive force to the crankshaft to break a crank pin. This ratchet wrench
is characterized by comprising ratchet yoke over-rotation suppressing means
(44, 45, 46a). The over-rotation suppressing means come to contact with a part
of a ratchet yoke (6a) when the ratchet yoke (6a) rotates to the maximum swing position
by power driving or to the position in which the angle is less than the over-rotation
angle at which the crank pin is broken by rotating only one more turn from the maximum
swing position with a torque applied to the output shaft thereby to suppress the
further over-rotation of the ratchet yoke (6a).
Inventors:
AMAMI, Tatsuya (6-15, Nonoue 3-chom, Habikino-shi Osaka 71, 5830871, JP)
Application Number:
JP2007/060424
Publication Date:
February 14, 2008
Filing Date:
May 22, 2007
Export Citation:
Assignee:
KUKEN CO., LTD. (6-15, Nonoue 3-chome Habikino-shi Osaka, 71, 5830871, JP)
株式会社空研 (〒71 大阪府羽曳野市野々上３丁目６番１５号 Osaka, 5830871, JP)
株式会社空研 (〒71 大阪府羽曳野市野々上３丁目６番１５号 Osaka, 5830871, JP)
International Classes:
B25B21/00; B25B21/00
Attorney, Agent or Firm:
SUGIMOTO, Katsunori (Nisshin Building, 14-22 Shitennoji 1-chome,Tennoji-k, Osaka-shi Osaka 51, 5430051, JP)