Compound displacement mechanism for simplified motors and compressors

A rotary displacement mechanism comprising:

• a housing having a bore therein;
• a rotor rotatably mounted in said bore, said rotor including a transverse slot;
• a piston slidably received in the transverse slot of said rotor and restrained from rotation relative to said rotor for reciprocating movement in the transverse slot of said rotor, said piston including a transverse slot;
• a shuttle slidably received in the transverse slot of said piston and restrained from rotation relative to said piston for reciprocating movement in the transverse slot of said piston;
• eccentric means for connecting said shuttle to said housing for rotation about an axis parallel to but fixedly offset from the axis of rotation of said rotor whereby said shuttle may slide in said transverse slot of said piston and said piston in said transverse slot of said rotor during rotation of said rotor relative to said housing;
• and porting means for enabling usage of the reciprocating piston as a first displacement mechanism and said reciprocating shuttle as a second displacement mechanism for compression or expansion of a gas passed therebetween by said porting means, said porting means including a first set of port means in said mechanism intermittently alignable during rotation of said rotor for allowing gas to pass from an intake passage in said housing through at least one passage in said rotor alternately to first spaces respectively displaced by opposite ends of said reciprocating shuttle, and a second set of port means in said mechanism intermittently alignable during rotation of said rotor for allowing gas to pass from said first spaces through at least one transfer passage in said housing to second spaces respectively displaced by opposite ends of said reciprocating piston.