Air flow controller for pneumatically operated watercraft lifts

摘要

An air flow controller for a pneumatically operated watercraft lift has a valve for opening and closing the air line to the pontoon and a manifold with a gate. The gate is biased to a first orientation in which air from the pontoon can be exhausted only to the atmosphere when the lift blower is switched “off.” When the blower is switched “on,” air flow from the blower moves the gate into a second orientation in which the blower can force air only into the pontoon. This configuration prevents flow of water into the blower during lowering of the pontoon while using relatively few and simple valve system components.

主权项

1. For directing air flow into and out of a pontoon of a pneumatically operated watercraft lift to raise and lower the pontoon in a body of water, a controller comprising:
a manifold having a gate; a first pneumatic path extending between said manifold and the pontoon; a second pneumatic path exiting from said manifold; means for biasing said gate to maintain said gate in a first orientation to permit pneumatic communication between said first path and said second path through said manifold; and means for overcoming said biasing means to maintain said gate in a second path through said manifold.