Patent ID: 6966283
Filing Date: 2005-11-22
Classification: F01L,F02B,F04B

Abstract:
1. An apparatus useful in a two-stroke cycle engine or a pump, the apparatus comprising: (a) a piston cylinder having a piston cylinder upper portion, a piston cylinder lower portion, a piston cylinder side wall with an interior surface and a piston cylinder top cover, the piston cylinder further having an intake port defined within the piston cylinder upper portion and an exhaust port defined within the piston cylinder lower portion; (b) an intermediate piston cylinder head fixedly disposed within the piston cylinder so as to separate the piston cylinder upper portion from the piston cylinder lower portion, the piston cylinder head extending transversely across the interior of the piston cylinder and having an upper surface and a lower surface, the piston cylinder head being disposed within the piston cylinder so as to define at least one head gap between the interior surface of the piston cylinder side wall and the piston cylinder head; (c) a piston slidably disposed within the piston cylinder, the piston having a piston side wall with an exterior surface, the piston being sized and dimensioned to be operatively sealable with the internal piston cylinder side wall, the piston also having a lower piston portion with a lower piston portion upper surface disposed within the lower piston and an upper piston portion comprising at least one upright extension member, the at least one upright extension member having an uppermost portion, the at least one upright extension member extending upwardly from the lower piston portion through the at least one head gap and being extendable upwardly into the upper cylinder portion, the lower piston portion upper surface being adapted to cooperate with the interior surface of the piston cylinder side wall, the at least one upright extension member and the lower surface of the piston cylinder head to define an enclosed lower chamber, the piston being operatively connected to a crank shaft by a piston rod and adapted to reciprocate within the piston cylinder between an upward cycle and a downward cycle; (d) a piston top wall disposed transversely within the piston cylinder and attached to the uppermost portion of the at least one upright extension member, the piston top wall being adapted to cooperate with the interior surface of the piston cylinder side wall to define an enclosed upper chamber in the upper cylinder portion immediately above the piston top wall, the piston top wall also being adapted to cooperate with the at least one upright extension member, the interior surface of the piston cylinder side wall and the upper surface of the piston cylinder head to define an enclosed intermediate chamber immediately below the piston top wall; (e) a valve for alternatively allowing the transfer of fluids into the intermediate chamber and for alternatively preventing the transfer of fluids from the intermediate chamber; and (f) means for alternatively allowing the transfer of fluids between the intermediate chamber and the lower chamber and for alternatively preventing the transfer of fluids between the intermediate chamber and the lower chamber.