Patent ID: 7431007

Claim:
A rotary apparatus adapted to perform as, compressor, pump, motor, metering device or an internal combustion engine, comprising: two identical vanes, two hollow sleeves, a hollow liner, timing devices including cams and associated linkages, a couplings/clutch, a shaft, and a braking/holding arrangement; wherein said cams define a variable initial angular displacement between vanes at the start of a sequence, commencing with one of said vanes being stationary and the other being rotating such that on reaching an angle of 360 degrees minus twice the initial angular displacement, both vanes rotate together through the initial angular displacement and the two vanes reach an initial position with the individual vanes position interchanged, subsequently the previously held vane rotates and previously rotating vane is held stationary until the rotating vane reaches an angle of 360 degrees minus twice the initial angular displacement from the stationary vane and so on continually; wherein said vane are fitted on to the hollow sleeves, said one vane on each sleeve, such that the vanes are radial to sleeve's surface and at one of the ends of each sleeve; wherein said vanes are so fitted that some portion of a vane surface protrudes out of the sleeve's end; wherein said sleeves are placed such that the ends of said sleeves fitted with vanes are placed adjacent, with the vanes angularly displaced by a minimum angle which is controlled, varied by said cams; wherein said surfaces where the vanes are attached on the hollow sleeves so as to allow a rotation of the adjacent vanes and said hollow sleeves fitting about a coaxial axis of said hollow sleeves; wherein said vanes are placed inside a liner; wherein said liner along with the sleeve surfaces forms an enclosure; wherein said liner having an inner surface is contoured along the path traced by an edge of said vanes while rotating about said axis, thus allowing rotation of the vanes about said axis; wherein said vanes divide said enclosure formed inside the liner into two chambers, characterized by the fact that said two hollow sleeves are coupled and uncoupled with a shaft by means of said coupling/clutching actuated by cams placed on and, or driven by the hollow sleeves; wherein said braking arrangment actuated by said cams or holding arrangement maintains said vanes stationary at a controlled but variable position alternately; wherein said cams define the angle by which the vanes are held stationary, separated, rotated simultaneously or independently; and wherein said timing devices allow said both vanes to rotate simultaneously through a predefined variable angle resulting in said rotary apparatus functioning with a variable compression ratio.