Importance

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Abstract

An external-axial rotary piston blower with two-arm or two-lobe pistons having cylindrical inner and outer advance surfaces and transitional surfaces between the advance surfaces, which extend from inner advance surfaces defining a partial circle or arc of 90.degree. into smooth, level or even inner transitional surfaces at right angles to the tangent to this partial circle or arc as far as to a curve or rounding-off, over which the pistons roll-off or move and from this rounding-off or curve into smooth, level or even outer transitional surfaces, which are inclined to the longitudinal axis of the piston at an angle of 120.degree., whereby the outer edges of the inner transitional surfaces of both of the two pistons then contact or engage, when these transitional surfaces are located or lie in a plane with the positioning of the pistons of 45.degree. to the longitudinal housing axis.

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First Claim