Patent GB-276331-A (GB)
IPC: F04C2/344
Filed: 1927-08-13
Abstract: 276,331. Roessler, A. C. Aug. 19, 1926, [Convention date]. Fixed-abutment type; packing vanes; backpressure, reducing.-The casing of a rotary pump having an eccentric rotor through which slides a vane with both ends contacting with the casing is formed to the shape of a limaþon curve and the vane is provided with rocking packing members K curved to the contour of the casing and projecting in front of the vane so as to be held against the casing periphery bv fluid pressure. The limaþon curve is generated by marking off a distance equal to half the length of the vane and packing members K on the extension of any line, drawn through the rotor centre, beyond the point where it cuts the circle which has the line joining the rotor and casing centres as a diameter. The packing members are received in arcuate grooved channels in the vane ends. The ports are arranged so that one end of the vane opens the outlet port G immediately after the closure of the inlet port F<2> by the other end of the vane so as to avoid any compression in the pump. The rotor may be flattened at X adjacent the vane slot H to allow solid matter to pass over to the suction side. The inlet and discharge connections F, G communicate with auxiliary chambers F<1>; V arranged adjacent the ports leading to the pump bore. The Specification as open to inspection under Sect. 91 (3) (a) comprises also the provision of the groove 35 in the casing periphery adjacent the line of contact of the rotor and casing with a passage 36 connecting it to the discharge port to prevent back-pressure. This subjectmatter does not appear in the Specification as accepted. Movable - abutment type ; working - fluid supply. - A rotary internal-combustion engine of the type in which an annular cylinder a is divided into two halves a<1>, a<2>, capable of relative rotation and carrying pistons b, b<1>, which are alternately held stationary and then drive a central shaft through differential gearing g, g<1>, g<3>, is provided with a concentric annular cylinder n and pistons o, o<1> which serve to deliver a compressed charge to the main cylinder a where it is further compressed and ignited. One of the additional pistons o is formed with ports and is given a small movement by a cam device to act. as a valve controlling the admission to the main cylinder. The cam device consists of a rod l<1> with a twoarmed tappet l<2> carried on one cylinder-half a<1> and is actuated by cams m, m<1> on the other cylinder-half to rock a sector arm p which moves the piston o whereby ports q, r in the piston o register alternately with ports q<1>, r<1> to allow a charge to be drawn into the additional cylinder n from an inlet chamber s, and with ports q<2>, r<2> to permit the passage of the compressed charge to the main cylinder a; the compressed charge is delivered past non-return valves q<4>, r<4> housed in the power piston b. The rod l<1> of the device serves also to engage and disengage friction clutch members i, h or i<1>, h<1> by means of cams l which operate slides h<4> and rods h<2> through the agency of rings h'. The clutch members alternately hold each cylinder-half a<1>, a<2> stationary. A pawl and ratchet may also be fitted for preventing backward movement. The fixed members i, i<1> of the clutch are carried by levers k which can move slightly against the action of a spring k<3>. The cylinder-halves a<1>, a<2> are held together bv a flanged ring a<3> fitted with antifriction balls f. Roller bearings b<3> and ball thrust bearings b<4> are provided for each cylinder half. The ignition contacts u<2>, u<3> are carried on one cylinder-half and closed by a cam u<4> on the other cylinder-half.