Ball screw and nut linear actuator assemblies and methods of cushioning their travel
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United States of America Patent
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Feb 9, 1999
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N/A
app pub date -
Mar 27, 1997
filing date -
Apr 4, 1996
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Abstract
A method and apparatus wherein a travel limit/dampening device is coupled to the end of a screw of a linear ball screw actuator device for limiting the travel of an actuator extension coupled to a nut supported for linear driven displacement in either direction along the screw. The travel limit/dampening device includes a gas shock supported within a double acting reaction device reactive axially between the nut and screw when the extension is fully retracted and extended, respectively, to collapse the shock absorber and thereby dampen the movement of the extension at each end of its stroke.
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