Brakes – Internal-resistance motion retarder – Position of thrust member relative to chamber
Patent
1976-06-28
1977-11-08
Blix, Trygve M.
Brakes
Internal-resistance motion retarder
Position of thrust member relative to chamber
188287, 267 65R, F16F 948
Patent
active
040571297
ABSTRACT:
A shock absorber including a housing having a ram slidably extending therefrom. A pair of concentric control sleeves divide the housing into inner and outer fluid chambers, and a piston is slidably received within the inner chamber. The inner sleeve has an axially aligned row of openings therein, and also has an elongated groove formed in the outer periphery thereof, which groove is circumferentially spaced from the row of openings. The inner and outer sleeves have opposed conical surfaces forming a narrow clearance space therebetween. A spring coacts between the housing and the outer sleeve for urging same axially in a direction whereby the openings in the inner sleeve are effectively closed, as by maintaining the narrow space at a minimum dimension. When a shock load is imposed on the ram causing the piston to move inwardly within the inner chamber, the fluid therein is pressurized and flows through the openings into the narrow space. The pressure of the fluid reacts against the conical surface on the outer sleeve and causes it to be axially displaced in opposition to the urging of the spring, thereby increasing the dimension of the narrow space whereby the fluid flows therethrough into the adjacent groove, from which it is discharged into the outer chamber.
REFERENCES:
patent: 3519311 (1970-07-01), Holden
patent: 3605960 (1971-09-01), Singer
patent: 3693767 (1972-09-01), Johnson
patent: 3706362 (1972-12-01), Faure
patent: 3750856 (1973-08-01), Kenworthy
Blix Trygve M.
Butler Douglas C.
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