Multi-chamber temperature compensated pneumatic counterbalance

Details Multi-chamber temperature compensated pneumatic counterbalance Multi-chamber temperature compensated pneumatic counterbalance

1981-04-24

1983-10-11

Butler, Douglas C.

Spring devices

Fluid

Expansible-contractible chamber device

267 6411, 267 6425, 188277, F16F 902

Patent

active

044087519

ABSTRACT:
A pneumatic, piston/cylinder counterbalance in which the counterbalance force is obtained by differential pressure across the piston and in which the force changes due to temperature are compensated by use of a variable volume cylinder having one or more auxiliary chambers separated by walls, each including a temperature responsive bi-metal disc valve normally acting as a check valve permitting flow into the auxiliary chambers but preventing flow out of the chambers except when the temperature drops to a predetermined value. In the multiple auxiliary chamber embodiment, flow into and out from each chamber is controlled by an associated bi-metal disc valve responsive to successively lower temperatures to enable a more linear stabilization of force output regardless of temperature.

REFERENCES:
patent: 2471655 (1949-05-01), Rundell
patent: 2833379 (1958-05-01), Matthews et al.
patent: 2971212 (1961-02-01), Voster et al.
patent: 2989299 (1961-06-01), Modrich
patent: 3163262 (1964-12-01), Allinquant
patent: 4030715 (1977-06-01), Duran

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