Infinite hydraulic check
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United States of America Patent
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Oct 10, 1995
Grant Date -
N/A
app pub date -
Aug 25, 1993
filing date -
Aug 25, 1993
priority date (Note) -
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Abstract
An infinite hydraulic check for use with a door that maintains the door in any position until an appropriate check effort is applied to release the door from the position. The check includes an annular needle cavity with a closed first portion and a second portion, the second portion including a by-pass port along an inner circumference. An annular needle is received in the needle cavity. The by-pass port is obstructed when the needle is in a partial open position. Hydraulic fluid driven through an inlet orifice gradually displaces fluid from the closed first portion of the cavity, forcing the needle further into the cavity, unobstructing the by-pass port and permitting increased fluid flow. The controlled activation of the damped check release reduces noise.
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