A gas driven mechanical oscillator and method

F - Mech Eng,Light,Heat,Weapons – 01 – B

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F01B 11/04 (2006.01) F01B 11/00 (2006.01) F01B 23/08 (2006.01) F01B 23/10 (2006.01) F01C 9/00 (2006.01) F01L 21/02 (2006.01) F02B 71/04 (2006.01) F02B 75/04 (2006.01) F04B 9/125 (2006.01) F25B 9/06 (2006.01) F25B 49/02 (2006.01) F25J 1/00 (2006.01)

Patent

CA 2168337

A gas driven oscillator (10) comprising an engine (11) having a cylinder (12) and a pair of expansion chambers (13, 14) on either side of a floating piston (15) adapted to reciprocate within the cylinder (12). The piston (15) is mounted on a piston rod (16) extending through the cylinder (12) and into a compressor (17). Compressed air is delivered from a tank (20) to the engine (11) via a pair of valves (22, 23) mounted on an adjustment screw and slidably disposed on the piston rod (16). The spacing between the valves (22 23) can be adjusted in order to vary the amplitude of the piston (15) within the cylinder (12). The piston rod (16) includes spaced slots (24, 25) which alternately align with passages inside the respective valves (22, 23) to deliver a pulse of compressed air to the respective chambers (13, 14) of the cylinder (12). Mercury is added to or discharged from a tank (42) which is rigidly secured to piston rod (16) to vary the inertia of the oscillator (10).

Un oscillateur (10) entraîné par un gaz comprend un moteur (11) ayant un cylindre (12) et une paire de chambres d'expansion (13, 14), une sur chaque côté d'un piston flottant (15) agencé pour effectuer un mouvement de va-et-vient dans le cylindre (12). Le piston (15) est monté sur une tige de piston (16) traversant le cylindre (12) et se prolongeant dans un compresseur (17). Le réservoir (20) fournit de l'air comprimé au moteur (11) par l'intermédiaire d'une paire de vannes (22, 23) montée sur une vis d'ajustage et pouvant coulisser sur la tige (16) de piston. L'espacement entre les vannes (22, 23) peut être ajusté pour modifier l'amplitude du mouvement du piston (15) dans le cylindre (12). Le tige (16) du piston comporte des fentes espacées (24, 25) qui viennent s'aligner successivement sur des passages à l'intérieur des vannes respectives (22 et 23) pour fournir une impulsion d'air comprimé aux chambres respectives (13, 14) du cylindre (12). On ajoute ou on retire du mercure d'un réservoir (42) qui est fixé rigide à la tige (16) de piston, pour modifier l'inertie de l'oscillateur (10).

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