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:
Sep. 25, 1984
Filed:
Oct. 30, 1981
Hiroaki Orikasa, Katsuta, JP;
Hitachi Koki Company, Limited, Tokyo, JP;
Abstract
A power-driven bolt fastening tool or shearing wrench includes an outer socket adapted to fit over the head of a bolt to be fastened and an inner socket disposed coaxially in the outer socket and adapted to fit over the tip of the bolt. A planetary gear mechanism comprises an internal gear coupled to the outer socket through a lost-motion connection, planet gears supported on shafts coupled to the inner socket, and a sun gear in mesh with the planet gears. The lost-motion connection comprises a torsion spring acting between the internal gear and the outer socket for allowing the internal gear to angularly move for a limited angular interval before the outer and inner sockets fit fully over the bolt head and tip and before a fastening torque is transmitted from the sun gear to the outer socket.