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:
Dec. 31, 1991
Filed:
Apr. 11, 1989
Toyota Jidosha Kabushiki Kaisha, Aichi, JP;
Abstract
A thread rolling apparatus has thread rolling dies mounted respectively on a pair of sliding mechanisms which are vertically movably driven by respective actuators, and a support disposed between the thread rolling dies for rotatably supporting a workpiece. The sliding mechanisms and the support are interconnected by a rack and pinion mechanism for imparting a forced rotational drive force to the workpiece in synchronism with the movement of the sliders. The lead angle of the thread rolling dies is set to match the forced rolling diameter of the workpiece. By adjusting the distance between the thread rolling dies in matching relation to the workpiece diameter before threading, the thread rolling apparatus can form different screws having equal pitches and different nominal diameters.