Brakes – Internal-resistance motion retarder – Resistance alters relative to direction of thrust member
Patent
1985-08-01
1986-11-18
Stoner, Jr., Bruce H.
Brakes
Internal-resistance motion retarder
Resistance alters relative to direction of thrust member
188287, 188314, 18832214, F16F 948, F16F 950
Patent
active
046230491
ABSTRACT:
Tubular members (22, 24) define a pressure chamber (26) and a reserve chamber (28) between them. A first variable metered hydraulic orifice area is provided between chambers (26, 28) by openings (32) in a metering tube (30). A second metered hydraulic orifice area is provided by fixed orifice (94). In a first mode of operation, both such areas are open during an initial retraction of members (22, 24). Control tube (34) is coaxial with metering tube (30) and has openings (36). In the first mode, latch (62) locks tubes (30, 34) together with openings (32, 36) aligned. Relative extension of members (22, 24) following the initial retraction causes pressure in chamber (28) to rise above pressure in chamber (26) and latch (62) to release control tube (34). Spring (40) moves tube (34) into a closed position in which it blocks openings (32). Shock absorber (20) then operates in its second mode in which fixed orifice (94) remains open and openings (32) remain closed. Relief valve (96) relieves excessive pressure buildup in chamber (26) in the second mode. Subsequent full extension of members (22, 24) automatically resets shock absorber (20) for operation in its first mode.
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Diefendorf Richard R.
Pauly Joan H.
Stoner Jr. Bruce H.
The Boeing Company
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