Brakes – Internal-resistance motion retarder – Valve structure or location
Patent
1985-06-17
1987-03-17
Butler, Douglas C.
Brakes
Internal-resistance motion retarder
Valve structure or location
1374939, 137512, F16F 934
Patent
active
046500430
ABSTRACT:
A telescopic hydraulic shock absorber including a base valve assembly having a valve body with three arcuate slots which lie between two concentric valve seats which are overlain by a flat annulus constituting a recuperation valve. This valve is normally held in contact with the valve seats by a recuperation valve spring. A passage of complex shape extends through the center of the valve body and the mouth of the passage at the lower end is surrounded by an annular valve seat. A compression valve pin with a shank cooperates with the valve seat to form a compression valve and the shank is guided in a valve guide located in a counterbore in the aperture. The valve guide comprises a solid ring portion having six integral projections. There is an annular clearance between the valve pin and the part of the passage which is in communication with an annular space between the ring portion and the part of the passage through the passageways between the projections of the valve guide. Thus there is communciation from one side to the other of the valve body through the compression valve. Such an arrangement can be used to produce a range of base valve assemblies by providing different valve guides with passages of different cross-sections.
REFERENCES:
patent: 2685888 (1954-08-01), Strauss
patent: 3519109 (1970-07-01), Whisler, Jr.
patent: 3584712 (1971-06-01), Dickinson
patent: 3706362 (1972-12-01), Faure
patent: 4054277 (1977-10-01), Sirven
patent: 4240531 (1980-12-01), Postema
Butler Douglas C.
Diefendorf Richard R.
Jonas Woodhead Limited
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