Spring devices – Vehicle – Bolster
Patent
1979-05-11
1980-07-29
Halvosa, George E. A.
Spring devices
Vehicle
Bolster
188285, 188289, 188315, 188274, 267137, 267138, 267139, 280710, F16F 948
Patent
active
042147379
ABSTRACT:
A shock absorber has a body with a bore and a secondary chamber housing a preloaded floating piston. An apertured piston and rod assembly with a float valve is retracted in the bore when the piston rod extending from the body is engaged by a moving body to be decelerated and smoothly stopped. A variable orifice head in the bore bleeds liquid through a series of passages to a return chamber which communicates with a hollow metering pin. This pin directs liquid through the piston and through outlets into a secondary chamber whose floating piston retracts against a spring as the chamber fills with liquid. This maintains a preload pressure upon the liquid in the bore and pressure chamber. The metering pin is tapered and is loosely received by the piston. When a load is axially applied to the piston rod retracting the pressure piston into the preloaded liquid within the body the liquid initially flows between the piston and metering pin. At a predetermined distance and due to the increasing diameter of the metering pin, flow through the piston is blocked, the majority of the fluid being metered through an adjustable orifice, through the metering pin and then into the pressure chamber retracting and maintaining a preload on the floating piston and bringing the piston with its load to a smooth stop at the end of the stroke. An orifice adjusting pin extends radially outward of the assembly to facilitate adjustment. The barrel defining the secondary chamber is aluminum and longitudinally fluted for maximum heat dissipation.
REFERENCES:
patent: 2834039 (1958-05-01), Sasse
patent: 3584712 (1971-06-01), Dickinson
patent: 3731770 (1973-05-01), Bindon
patent: 3892298 (1975-07-01), Blatt
patent: 3991863 (1976-11-01), Lee
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