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:
Apr. 06, 1993
Filed:
Apr. 24, 1991
Osamu Izumisawa, Tokyo, JP;
Shinano Pneumatic Industries, Inc., Kamiminochi, JP;
Abstract
A rotary impact tool including a generally tubular cage rotated by a motor about a central longitudinal axis of the cage. The cage has an internal wall with axially extending guide channels formed in it for receiving hammer pins capable of moving axially in the guide channels. The hammer pins have a generally flat striking surface. An output shaft mounted generally coaxially with the cage for rotation relative to the cage has radially outwardly projecting anvils having generally flat impact surfaces. A clutch mechanism intermittently moves the hammer pins to an extended position in which the striking surfaces of the hammer pins are in registration with the impact surfaces of the anvils. The striking surfaces of the hammer pins strike the impact surfaces of the anvils upon further rotation of the cage for delivering an impact to the output shaft, and then withdrawn by the clutch mechanism to regain momentum.