Telescopic ball nut and screw linear actuator and method of constucting and using it
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United States of America Patent
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Aug 31, 1999
Grant Date -
N/A
app pub date -
Jun 30, 1997
filing date -
Oct 4, 1996
priority date (Note) -
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status (Latency Note)
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Abstract
A telescopic multiple ball screw nut linear actuator has an outer screw and first nut defining a first helical ball raceway between them. The screw has a tubular portion with an axially open outer end on which a second nut is fixed. An inner screw, providing with the second nut a second helical ball raceway of opposite hand, is received within the outer screw tubular portion and is projectable from its open outer end, and a non-helically grooved, plug end fitting the inner diameter of the tubular portion of the outer screw is provided on the axially inner end of the inner screw and coacts with the tubular portion of the outer screw, with only an operating clearance therebetween, to restrain whipping when the inner screw is in projected position. The plug in one position relative to the second nut establishes the limit of projection of the inner screw by blocking the travel of the balls in the second raceway from the second nut to the inner screw.
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