Simultaneous compression, distinct pistons, restricted communication to a single combustion chamber:
(under subclass 52.1) Multiple cylinder engine including at least two cylinders each of which is connected to a single combustion chamber by a passage which is constricted to limit free flow of gasses between at least one of the cylinders and the combustion chamber and including means to coordinate movement of the pistons so as to compress the charge in the single combustion chamber.
(1) Note. One piston of the "at least two" cylinders may move somewhat in advance of the other. There may be provision to prevent a fresh combustible mixture separate from the residual products of combustion from the previous charge, as by leading the supply-conduit into one working cylinder, while the exhaust-conduit leads from another.
SEE OR SEARCH THIS CLASS, SUBCLASS:
51, for an engine including multiple pistons that utilize a single combustion chamber without restriction of flow of combustion gases there between. The engine of that subclass may include two oppositely moving pistons in a single cylinder.
