Telescopically lenghtening/shortening power unit
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United States of America Patent
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Oct 18, 2016
Grant Date -
Feb 21, 2013
app pub date -
Feb 4, 2011
filing date -
Feb 5, 2010
priority date (Note) -
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status (Latency Note)
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Abstract
Power unit that can be telescopically lengthened or shortened and performs linear movement, and includes cylindrical parts moving telescopically within each other. The cylindrical parts are equipped with at least external or internal threads to form a power unit that can be lengthened or shortened when the parts are being rotated in relation to each other. At least one cylindrical part is locked to be non-rotating or locked to rotate differently than a last cylindrical part to which a rotating producing movement to the power unit is arranged. The cylindrical parts are made of plastic and the inner diameter of the part having the smallest diameter is over 25% of the useful height produced by the smallest cylindrical part.
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