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. 08, 1981
Filed:
Nov. 20, 1979
Applicant:
Inventors:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B21B / ; B21D / ;
U.S. Cl.
CPC ...
72 20 ; 72177 ; 72234 ;
Abstract
The rolls of each rolling mill stand of a rolling mill train are driven by a hydraulic turbine. A variable displacement pump is operated to apply hydraulic pressure to each of said turbines to operate the same at an infinitely variable speed. Any change of said hydraulic pressure applied to the turbine which drives a preceding one of said stands in response to the initial passing of the stock through a succeeding one of said stands is detected. The displacement of the variable displacement pump which operates the turbine which drives said succeeding stand is adjusted to correct the speed of the turbine which drives said succeeding stand to compensate the change of the hydraulic pressure which has thus been detected.