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US 5,626,516 AGranted
Pressure actuated door
AssigneePhillips Plastics Corporation
InventorFrancis C. Peterson
Life of this patent
Estimating the term…
Abstract
The invention is a flow control for a ventilation duct. It includes a movable panel which is attached to a variable volume reservoir. The application of vacuum to the reservoir controls the angular position of the door and the volume of the reservoir.
Claims1
A door assembly for controlling air flow through a ventilation duct, said door assembly of the type having a reservoir and a movable panel;
- wherein the improvement comprises:
- a tube connected to said movable panel and communicating with said reservoir;
- a rotary piston coupled to said tube and having a port which communicates with said reservoir;
- and
- an annular control ring mounted concentric with said rotary piston and having a slot in communication with a source of pressurized fluid, whereby the position of said slot with respect to said port determines the position of said door panel.
2 more elements
Dependencies are inferred from the claim text.