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. 08, 1986
Filed:
Apr. 25, 1984
Takanosuke Ohki, Yokohama, JP;
Kokan Kako Co., Ltd., Yokohama, JP;
Abstract
A pipe material is tightly clamped into a first pair of split forming dies to form a first formed tubular body which comprises a cylindrical wall part and a flat wall part, and then the first formed body is clamped tightly into a second pair of split forming dies, the interior of which is formed to be complementary to a toothed rack to be produced on the flat wall part. A mandrel is then forcefully inserted, either with or without vibration, into the bore of the first formed part while contained within the second forming dies, so that the teeth of a rack are formed on the flat wall of the first formed part by plastic deformation. A rack thus produced from a pipe material is light in weight and inexpensive, while functionally equivalent to a rack conventionally produced by machining from a round bar.