Device for shifting one structure with respect to another
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United States of America Patent
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Feb 16, 2016
Grant Date -
Dec 18, 2014
app pub date -
Jun 12, 2014
filing date -
Jun 12, 2013
priority date (Note) -
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Abstract
A device (10) for shifting one structure with respect to another, is disclosed. The device comprises a body (12) defining a cylinder, a core (14) within the cylinder and rotatable in the cylinder with respect to the body (12). A coil spring is connected between the body (12) and the core (14) and is wound or unwound as the core (14) is rotated in the cylinder. A compressible ring (48) is carried by the core (14) and is in frictional contact with the body. The ring (48) can be compressed by a nut (66) screwed onto a shaft (50) forming part of the core (14) so that the frictional resistance offered by the ring (48) to turning of the core (14) in the cylinder is increased.
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