Apparatus for folding a pontoon unit

Details Apparatus for folding a pontoon unit Apparatus for folding a pontoon unit

1986-11-14

1988-07-05

Basinger, Sherman D.

Ships

Boats, boat component, or attachment

Sectional

114267, B63B 3536

Patent

active

047547235

ABSTRACT:
A pontoon unit capable of folding up in a W-like manner. The two inner pontoons are connected by a center hinge, and the outer pontoons are pivotably connected to the inner pontoons by lower hinges via a lever. As an aid to overcome the buoyancy during unfolding, a tension spring is arranged between the lever and the outer pontoon. This spring is tensioned in the folded condition. After unfolding, the tension spring is virtually relaxed, and would be tensioned again for folding. This is avoided by interposing a variable-length connection member, typically a hydraulic piston/cylinder unit, between the tension spring and the outer pontoon. By being extended, this connection member avoids the need for the tension spring to be tensioned during folding. Only after the folding operation has been completed is the tension spring tensioned again by shortening the connection member.

REFERENCES:
patent: 4223623 (1980-09-01), Brunet et al.

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