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. 18, 2003
Filed:
Jan. 24, 2001
Juhani Vestola, Jyväskylä, FI;
Jorma Köliö, Jyväskylä, FI;
Arto Puranen, Jyväskylä, FI;
Metso Paper, Inc., Helsinki, FI;
Abstract
The invention concerns a method and a device for changing the natural frequency of a nip roll construction in a paper or board machine so that the rigidity of one or several loading elements, for example loading cylinder or loading beam, in the nip roll construction is varied. The loading cylinder with adjustable rigidity in accordance with the invention comprises a cylinder ( ), into which two pistons ( ) have been fitted. The pistons ( ) have been attached each of them to a piston rod ( ) of its own, which piston rods have been passed through the end walls ( ) of the cylinder ( ). Thus, in the cylinder ( ), between the pistons ( ), a work pressure space ( ) is formed, and at the opposite sides of the pistons ( ) counter-pressure spaces ( ) are formed. The pressure in and the volume of the work pressure space ( ) are kept invariable, and the volumes of the counter-pressure spaces ( ) are varied, in which connection the cylinder ( ) moves on the piston rods ( ), and the rigidity of the loading cylinder can be varied.