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:
Jun. 09, 1992
Filed:
Jan. 04, 1991
Yutaka Sunaga, Yokohama, JP;
Toshio Sakurai, Yokohama, JP;
Sanwa Kokan Co., Ltd., Yokohama, JP;
Abstract
A method of and a device for cold drawing seamless metal tubes, each tube having an upset portion on both ends. The draw bench comprises a reducing die, a die control unit, a plug control unit including a plug and a draw unit. The reducing die has an internal surface including an inlet portion which tapers rearwardly, a small diameter bearing portion and an oppositely inclined outlet portion. A plug includes a rearwardly tapered portion, a large diameter bearing portion, a forwardly tapered portion, a small diameter cylindrical portion, a rearwardly tapered portion and a large diameter cylindrical forward bearing portion. The plug control unit is mainly movable with respect to the die control unit by a pair of hydraulic units, but the control unit is also movable with respect to the plug control unit for changing a cross sectional reducing area between the reducing die and the plug.