Contractable shock absorber strut

Details Contractable shock absorber strut Contractable shock absorber strut

1979-03-19

1981-09-29

Frankfort, Charles E.

Aeronautics and astronautics

Landing gear

Retractable

244104FP, 267 6412, B64C 2510, B64C 2558

Patent

active

042918502

ABSTRACT:
This shock absorber strut incorporates an annular piston between the lower and upper bearings of the shock absorber piston; together with a separator piston in the bore of the shock absorber piston. The volume below the separator piston is filled with hydraulic fluid and is connected to an external hydraulic power source. An external hydraulic power source is also connected between the annular piston and the shock absorber lower bearing. Application of external hydraulic pressure to the underside of the annular piston, while simultaneously draining off fluid below the separator piston, causes the shock absorber to contract. The volume vacated by the fluid below the separator piston provides a reservoir for displaced shock absorber fluid which pushes the separator piston down the bore of the shock absorber piston. The contracted strut is then locked hydraulically. The procedure is reversed for shock absorber extension.

REFERENCES:
patent: 1918426 (1933-07-01), Radnor
patent: 2647708 (1953-08-01), Haverlin
patent: 2735634 (1956-02-01), Fosness
patent: 2735674 (1956-02-01), Smith et al.
patent: 2814482 (1957-11-01), Anderson et al.
patent: 2863623 (1958-12-01), Lebold
patent: 3533613 (1970-10-01), Bendicsen

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