Abstract: An engine (2) is a four-flow scavenging type engine. Four scavenging ports (34) include: first right and left scavenging ports (34(lef-1) and 34(ref-1)) that lie on a side relatively away from an exhaust port (22) and that lie facing each other with a cylinder (4) in between; and second right and left scavenging ports (34(lef-2) and 34(ref-2)) that lie closer to the exhaust port (22) than first right and left scavenging ports do and that lie facing each other with the cylinder (4) in between. The second left scavenging port and the first right scavenging port that make up a first mutually diagonal set (Diag-No. 1) have different opening timings from those of the first left scavenging port and the second right scavenging port that make up a second mutually diagonal set (Diag-No. 2).

Abstract: To improve the efficiency of an axial piston engine, the invention proposes an axial piston engine with a combustion chamber which operates with two-stage combustion.

Abstract: An engine including at least one cylinder in which a piston moves delimiting a combustion chamber and a housing, with at least one opening for allowing fresh air to enter the combustion chamber and one pneumatic injection device. The fuel is atomized or sprayed and injected into the chamber by using a compressed gas. For small engine charges, a compressed gas is used, with the compressed gas being derived solely from the chamber or the housing of the cylinder of the engine, and for high engine charges, another compressed gas is used derived from a source outside the cylinder. The source outside the chamber may include a mechanical compressor driven by one of a two-stage engine or a turbocompressor.

Abstract: This invention relates to a medical device and more particularly, to a novel medical device suitable for use as a skin massager to relieve itchiness, irritation and general discomfort of the skin felt by a person wearing a cast or splint. The device comprises a thin, elongated strip having a plurality of randomly-spaced protrusions on one surface and a plurality of rounded indentations inset in the opposite surface, with the remaining areas of the opposite surface being smooth. The device provides a safe yet economical manner to massage the skin without producing any untoward or allergic reactions and is quite inexpensive to produce.

Abstract: A two-stroke internal combustion engine having a stepped piston in which the cylinder casting has a bore of greater diameter to form a pumping part, a bore of lesser diameter to form a working part, exhaust port means in the working part and opposed transfer port means on opposite sides of the working part disposed symmetrically about a plane passing through the longitudinal axis of the cylinder and center of the exhaust port means, the transfer port means being of a form to be produced in the casting process by non-separate cores introduced linearly towards the plane.

Abstract: A two-cycle spark ignition engine is provided with jet ignition means including a prechamber formed within the piston and connected by a restricted passage with the main combustion chamber. At piston bottom dead center, the prechamber connects with an auxiliary inlet from which it receives a rich air-fuel mixture. At piston top dead center, the prechamber communicates with a spark plug that initiates combustion in the rich mixture, causing a flame jet to shoot through the restricted passage to the main combustion chamber, igniting and burning the lean mixture therein. A lean air-fuel mixture may be provided in the main chamber by any of several means, including direct or manifold injection, carburetion or carry-over from the rich mixture in the prechamber. Both uniflow scavenged and loop scavenged arrangements are disclosed.