Device changing purchase of block and tackle

Details Device changing purchase of block and tackle Device changing purchase of block and tackle

B - Operations, Transporting

63

H

B63H 9/10 (2006.01)

Patent

CA 2152703

This invention can be used to construct multipurchase block system. Purchase of the system increases as the distance between objects, connected with the system, decreases and vice versa. The purchase increases in one or more steps, depends on number of devices used. Sailboats and other sail driven apparatuses often use blocks to trim sails. The disadvantage of traditional block and tackle is constant mechanical advance also called purchase whereas the pulling strength exerted on sheets differs from one point of sail to another. At the same absolute wind velocity, the tension on sheets become greater as the boat goes closer to the wind. This invention compensates for the increasing tension by automaticaly engaging additional sheaves in work when the sail is trimmed closer a certain point and disengage the sheaves on the way back thus changes purchase of block and tackle according to the trim of sail. The point of engaging/disengaging can be adjustable or preset. These devices may find their use on small to medium size sailboats especialy those with no winches.

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