The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 09, 2010
Filed:
Aug. 06, 2004
Jyunichi Toukairin, Hitachinaka, JP;
Kenji Kataoka, Hitachinaka, JP;
Kazuhide Ohzeki, Hitachinaka, JP;
Takuma Saito, Hitachinaka, JP;
Shinki Ohtsu, Hitachinaka, JP;
Shigeru Ishikawa, Hitachinaka, JP;
Hideki Watanabe, Hitachinaka, JP;
Jyunichi Toukairin, Hitachinaka, JP;
Kenji Kataoka, Hitachinaka, JP;
Kazuhide Ohzeki, Hitachinaka, JP;
Takuma Saito, Hitachinaka, JP;
Shinki Ohtsu, Hitachinaka, JP;
Shigeru Ishikawa, Hitachinaka, JP;
Hideki Watanabe, Hitachinaka, JP;
Hitachi Koki Co., Ltd., Tokyo, JP;
Abstract
An impact drill for boring a workpiece includes a main frame, a motor housed in the main frame, a spindle movably supported by the main frame and rotatable by the motor and movable in its axial direction, a first ratchet positioned fixedly with respect to the spindle, a second ratchet positioned with respect to the first ratchet, a spring biasing the second ratchet toward the first ratchet. The spring has at least one of a spring constant and a biasing force which prevents the second ratchet and the spindle from abutting against the main frame at least one of when a force ranging from 15 to 25 kg is applied to the main frame for boring the workpiece and when the spindle is moved to a retracted position.