Constant pressure area telescoping piston and method of using sa

Details Constant pressure area telescoping piston and method of using sa Constant pressure area telescoping piston and method of using sa

1998-08-20

2000-06-13

Carone, Michael J.

Aeronautics and astronautics

Aircraft structure

Passenger or cargo loading or discharging

89 154, 91520, 91535, 92151, 92152, B64D 112, B64D 104, F15B 1100, F01B 700

Patent

active

060738863

ABSTRACT:
An actuator assembly that has a constant net pressure area telescoping piston. The actuator assembly has a cylindrical housing; nesting, telescoping pistons; a central plug; an outer cap; and a vent. The cylindrical housing has an interior surface and a base that terminates at an open end. The nesting, telescoping pistons are located in the housing and can extend past the housing open end. The telescoping pistons have an outer piston slidably sealed against the housing and an inner piston that is slidably sealed against the outer piston. The outer piston has a first end proximal to the housing base, and a second end distal to the housing base. The inner piston has an open end proximal to the housing base, and a closed end distal to the housing base. The central plug extends from the base and into the telescoping pistons. The central plug is in pressurized communication with the inner piston and is engagable with a pressurized fluid source. The outer cap has a first and a second member. The first member is sealed against the outer piston first end. The second member radially extends inwardly from the first member and is slidably sealed against the fixed central plug. The vent extends through the housing to a portion of the housing interior surface between the base and the outer piston cap. With this arrangement, the net pressure area on the telescoping piston remains the area of the inside of the inner piston closed end throughout the piston stroke.

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