Gas spring
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United States of America Patent
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Aug 16, 2016
Grant Date -
Jul 25, 2013
app pub date -
Jan 23, 2012
filing date -
Jan 23, 2012
priority date (Note) -
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Abstract
A gas spring for forming equipment, including a piston received at least partially in a cylinder for reciprocation between extended and retracted positions, and including a throttling passage disposed between the piston and the cylinder in fluid communication between first and second pressure chambers during at least a portion of the reciprocation of the piston. The throttling passage is of variable cross-sectional area, which varies with a length of the passage to at least partially restrict gas flow therethrough in a manner varying with return of the piston toward its extended position to decelerate the piston at a predetermined rate.
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