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. 06, 1979
Filed:
Mar. 04, 1977
Toyota Jidosha Kogyo Kabushiki Kaisha, Toyota, JP;
Abstract
A holder for use in cutting the outside surface of a cylindrical blank, the inner bottom of which has a concave spherical seat, to make said outside surface concentric with said concave spherical seat, characterized in that a rotatable shaft of a smaller outside diameter than the inner diameter of said blank and having a tip bearing against said concave spherical seat is provided longitudinally with three equi-distant grooves. A concave spherical surface is formed at the bottom of each of said grooves and this surface has a concave spherical surface of radius R with its axis running at right angles to the longitudinal direction of said rotatable shaft. In each groove of said shaft is slidably inserted an expansion pawl having at its top a projection bearing against the inside surface of said blank and having at its bottom a convex spherical surface of radius r (R > r). The invention includes a method of correcting concentricity by using said holder.