Cushionloks®: Brochure | Drawings
The Cushionloks® system consists of a rectangular bar that fits through a guide on one leaf tip and into a receiver on the other. This allows shear load transfer from one leaf to the other, so the leaf tips deflect uniformly during the passage of vehicular traffic.
Stiff disc springs support the wear shoes in the guide and receiver housings and ensure firm, continuous contact between the bar and shoes. Shock loads to the bar are reduced, zero clearance exists between the bar and shoes, and uncontrolled bounce of the leaf tips is eliminated.
The first Cushionloks® were installed and put into operation February 1995 on the Bellaire Causeway Bascule Bridge, Pinellas County, Florida. Since that time they have functioned without difficulty. Maintenance savings have been significant because no measurable wear has occured on the bar or shoes and no routine maintenance or emergency adjustments have been required. The leaf tips continue to deflect uniformly, and without looseness, pounding, or noise during the passage of heavy traffic.
Cushionloks® are now in use on small and large bridges with bar sizes from 4 x 6 in. to 6 x 9 in. for shear load transfers from 25,000 lbs. to 120,000 lbs. per bar.