F - Mech Eng,Light,Heat,Weapons – 16 – D
Patent
F - Mech Eng,Light,Heat,Weapons
16
D
188/135
F16D 55/46 (2006.01) F16D 55/40 (2006.01) F16D 65/14 (2006.01) F16D 55/00 (2006.01)
Patent
CA 1067425
PISTON AND EXTENSIBLE CYLINDER THEREFOR ABSTRACT OF THE DISCLOSURE A fluid pressure actuated piston of an aircraft multiple disc brake assembly is adapted to have an extended stroke by telescoping with a pressure actuated cylinder. The piston is slidably carried in a fluid pressure actuated cylinder which, in turn, is slidably carried in a fixed carrier. Initially, only the piston moves axially to extend its stroke with respect to the carrier. The cylinder's structure and axial position with respect to the carrier creates a fluid pressure responsive surface area initially sealed from the effects of the fluid pressure. Axial move- ment of the cylinder is initially resisted by either mechanical or differ- ential pressure means until the stroke of the piston reaches a predeter- mined axial position to engage the cylinder. Continued extension of the piston's stroke urges the cylinder axially to break the fluid seal and expose the heretofore unaffected surface area of the cylinder to fluid pressure thereby extending the stroke of the cylinder a predetermined axial distance. The piston's maximum allowable stroke is thereby increased the same distance the cylinder travels. The output force of the piston is essentially unaffected by the force imposed on the cylinder necessary to overcome the fluid seal and once extended, the cylinder does not provide any work force area.
308819
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