Patent ID: 6171208
Filing Date: 2001-01-09
Classification: B23D,B28D,F16H

Abstract:
A device for tensioning flexible elements wound onto pulleys,wherein a pulley (4) is able to perform translatory movements relative and perpendicular to a shaft (8) on which it is rotatably mounted, respectively between an advanced position, where minimum tensioning of a flexible element (2) associated with the pulley (4) occurs, and a retracted position, where maximum tensioning of the flexible element (2) occurs, tensioning means being provided in order to cause said translatory movements of the pulley (4) with respect to the shaft (8);wherein said tensioning means are housed inside an opening (12) inside a central zone of the pulley (4), said opening (12) having a fixed position relative to the rotational movement of the pulley (4) about said shaft (8); andwherein said tensioning means comprise at least one sliding shoe (16) which is integral with the shaft (8) and which has, associated with it, at least one hydraulic jack (19) connected at one end to a bearing (13) and at the other end to the said sliding shoe (16), fluid under pressure being made to circulate inside the hydraulic jack (19) in order to cause relative translation of said sliding shoe (16) with respect to said bearing (13) which results in the relative translation of said pulley (4) with respect to said shaft (8).