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:
Jul. 11, 2006
Filed:
Mar. 03, 2005
Takuma Saito, Ibaraki, JP;
Shinki Ohtsu, Ibaraki, JP;
Hideki Watanabe, Ibaraki, JP;
Junichi Toukairin, Ibaraki, JP;
Takuma Saito, Ibaraki, JP;
Shinki Ohtsu, Ibaraki, JP;
Hideki Watanabe, Ibaraki, JP;
Junichi Toukairin, Ibaraki, JP;
Hitachi Koki Co., Ltd., Tokyo, JP;
Abstract
An impact drill includes a first ratchet rotating along with a spindle and movable in an axial direction, a second ratchet engaged with the first ratchet and movable in a axial direction but unrotatable, and a spring provided between the second ratchet and a partial member of a housing. An amount of movement of the spindle in the axial direction is regulated, so that the pressing force is too excessive, the restoring force of the spring urging the second ratchet is controlled to maintain a state of generating a set stroke force.