Abstract: An internal combustion engine is provided which includes a compression bank and an expansion bank each of which include a toroidal cylinder and at least a pair of cooperating pistons within each cylinder. The pistons define expanding and contracting chambers within the cylinders. The chambers defined by the revolving pistons in the compression bank serve to force a compressed mixture of fuel and air, or other oxidizing agent, into a combustion chamber where the fuel is ignited and acts against the expansion bank pistons forcing them in opposite directions. At least one piston in the expansion bank and the compression bank revolves within its respective cylinder in a predetermined and unitary direction. A single bank or plurality of compression banks of pistons can be used as a compressor. Moreover, a single or plurality of expansion banks of pistons can be used.

Abstract: A closure for a collapsible tube having a base portion mounted on the reinforced dispensing end of the tube. The base portion of the closure defines a bore communicating at one of its ends with the interior of the tube. The opposite end of the bore opens on the surface of a substantially spherical portion of the base member and serves as an outlet through which the tube contents are dispensed. This outlet is selectively opened and closed by a cap member fabricated from a semi-rigid material which defines a cavity which rotatably receives the spherical member therein. The tube contents are dispensed by rotating a port defined in the cap member into alignment with the base portion outlet and collapsing a portion of the tube wall. In one embodiment means are provided to assist in guiding the rotation of the cap member with respect to the spherical member for purposes of aligning the base portion opening and the cap member opening.