Mechanism for tensioning a moving chain

Details Mechanism for tensioning a moving chain Mechanism for tensioning a moving chain

1988-05-10

1989-09-05

Peters, Jr., Joseph F.

Ships

Anchoring arrangement

114200, 254372, 188 651, B63B 2124

Patent

active

048628212

ABSTRACT:
In an anchoring system for a floating vessel which includes an anchor line comprising chain cable, a chain locker and a windlass having a chain wheel that conveys the chain cable during paying out from the chain locker, a mechanism is positioned between the chain locker and chain wheel to back-tension the chain during paying out. The mechanism has an axis along which the chain is passed with every second links oriented in a given plane. Paired brake shoes are positioned to either side of the plane and define braking surfaces of sufficient extent along the axis of chain movement that a given chain link and an immediately succeeding link of similar orientation can be simultaneously engaged during their movement to provide a continuous retarding effect. One pair of braking shoes is pivotally mounted on an appropriate support structure and urged with hydraulic cylinders towards the other pair thereby causing the brake shoes to engage the opposing faces chain link. The pressure of hydraulic fluid applied to the cylinders is adjusted to back-tension the chain sufficiently that sudden shocks to the windlass otherwise occasioned by tilting and jumping of chain links during conveyance over the chain wheel are avoided. Non-standard links and irregularities in the chain link surfaces such as weld lines are accommodated by contraction of the hydraulic cylinders and deflection of the pivoting brake shoes.

REFERENCES:
patent: 3540396 (1970-11-01), Horton
patent: 3547066 (1970-12-01), Bugaenko
patent: 4476801 (1984-10-01), Foster et al.

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