Brakes – Internal-resistance motion retarder – Using diverse fluids
Patent
1991-09-16
1993-03-02
Halvosa, George E. A.
Brakes
Internal-resistance motion retarder
Using diverse fluids
188282, 188285, 188299, 188317, 267 6415, 267127, F16F 906, F16F 934
Patent
active
051901269
ABSTRACT:
A shock absorber is constructed with a hollow cylinder within which a first piston is disposed to move coaxially. A well is defined within the first piston to receive a second piston. The first piston is also provided with longitudinally extending dampening passageways and relief passageways. A cavity of variable volume filled with a compressible fluid, such as air, is defined between the two cylinders. At the start of a stroke of movement of the first piston within the cylinder, the additional length of the piston rod which enters the cylinder as the first piston moves toward the blind end of the cylinder increases pressure on the compressible fluid within the cylinder. The second piston is thereby pressed further into the first piston and ultimately closes off the dampening passageways, thereby preventing further movement of the first piston and increasing the dampening characteristics of the shock absorber. Upon return of the first piston, the compressed air is allowed to expand and as the length of the piston rod that remains within the cylinder decreases, the dampening characteristics of the shock absorber increase.
REFERENCES:
patent: 2244501 (1941-06-01), Pierce
patent: 2357278 (1944-08-01), O'Connor
patent: 3990687 (1976-11-01), Curnutt
patent: 4210344 (1980-07-01), Curnutt
patent: 4245854 (1981-01-01), Curnutt
patent: 4683992 (1987-08-01), Watanabe
patent: 4749068 (1988-06-01), Sirven
patent: 4972928 (1990-11-01), Sirven
Halvosa George E. A.
Thomas Charles H.
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