Gas spring having three different damping-rate stages

Details Gas spring having three different damping-rate stages Gas spring having three different damping-rate stages

1980-08-12

1983-05-17

Butler, Douglas C.

Brakes

Internal-resistance motion retarder

Resistance alters relative to direction of thrust member

188284, 188316, 267120, F16F 949, F16F 906

Patent

active

043835953

ABSTRACT:
In the illustrative embodiment of the invention disclosed, a pressurized gas spring is arranged to provide three different damping-rate states as the piston rod is progressively urged axially outward of the cylinder. A first damping-rate stage is provided by an axially movable ring carried by the piston structure, a second stage is provided by an axially movable sleeve member slidably mounted on the piston rod for engagement at its inner end with the piston structure, and a third stage is provided by entry of the outer end of the sleeve member into a damping cylinder mounted adjacent the end wall of the cylinder through which the piston rod extends. The three damping-rate stages act cumulatively increasingly to slow outward movement of the piston rod. In the disclosed embodiment, the gas spring is mounted so as to be in the rod-down orientation when the piston rod is fully retracted, and the sleeve member is moved by gravitational force into engagement with the piston structure, thereby initiating the second damping-rate stage, when the gas spring moves to the rod-up orientation during use.

REFERENCES:
patent: 3175645 (1965-03-01), Schafer et al.
patent: 3625320 (1971-12-01), Doetsch et al.
patent: 3937450 (1976-02-01), Bauer
patent: 3963227 (1976-06-01), Molders
patent: 4089512 (1978-05-01), Allinquant et al.
patent: 4113071 (1978-09-01), Muller et al.

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