Multi-chamber temperature compensated pneumatic counterbalance

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

E - Fixed Constructions

05

F

268/20

E05F 15/02 (2006.01) F16F 9/52 (2006.01)

Patent

CA 1175866

B-183 MULTI-CHAMBER TEMPERATURE COMPENSATED PNEUMATIC COUNTERBALANCE ABSTRACT OF THE DISCLOSURE 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 pre- venting 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.

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