Compensating for the elongation of large chain or belt drives generally requires installation of two or more tensioning elements on the slack side of the chain. This is no longer necessary with the "Boomerang" tensioner. Because of its bent double arm equipped with two chain wheels or a combination of belt pulleys/flat rollers, the simple design triple compensates for chain or belt elongation caused by aging.
Due to the loop guiding of the chain, elongation is compensated three times.
Key to the Boomerang's success is a ROSTA rubber suspension element. Constructed of four pre-tensioned rubber inserts between the outer housing and the inner square-section tube, offset at an angle of 45º, the suspension element combines the functions of a torsion spring, a pivot bearing, and vibration damper—all in one. The element has no metal-to-metal contacts or friction, so operation is silent and maintenance-free.
Rich Kasprzyk, ROSTA LLC, 2655 Wisconsin Ave., Downers Grove, IL 60515; Tel: (630) 852-7762; Fax: (630) 852-1641; E-mail: firstname.lastname@example.org
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