Arrangement at self expanding booms
AssigneeExpandi Systems AB
InventorPer Olof Oberg
Life of this patent
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Abstract
A valve mechanism for self-expanding booms. The mechanism is preferably a mechanical expansion device that folds out the boom so that air flows into the boom to fill the boom. When the boom is folded, the air is pressed out of the boom. A novel feature is an automatic control mechanism that is adapted to permit an inflow of air into the boom when the boom is expanded and to permit an outflow of air when the boom is collapsed, rolled up and stored. The control mechanism is affected by the relative position between the valve mechanism and other parts of the boom when the boom is in the expanded or collapsed position.
Claims7
A device providing ventilation of a self expanding boom that ensures an air inflow into the boom arranged as a substantially sealed container when the boom is expanded and that ensures an air outflow when the boom is collapsed, the device comprising an automatic valve means having a valve body which, as a result of relative movement between portions of the boom, is shiftable between a first position in which the valve body permits air inflow into the boom and a second position in which the valve body permits air outflow from the boom;
- and further including a flexible member connected between the boom and the valve body in such a way that the flexible member is substantially slack when the boom is expanded and the valve body is in its first position whereas, when the boom is collapsed, the flexible member is tightened and displaces the valve body to its second position to permit air outflow from the boom.
Dependencies are inferred from the claim text.