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An internal combustion apparatus is disclosed having a linear output. A metered quantity of gas fuel is transferred between a cylinder head and the disc of a plunger reciprocable in a principal chamber between top and bottom end of stroke positions. In the displacement of the plunger to its bottom e

An internal combustion apparatus is disclosed having a linear output. A metered quantity of gas fuel is transferred between a cylinder head and the disc of a plunger reciprocable in a principal chamber between top and bottom end of stroke positions. In the displacement of the plunger to its bottom end of stroke position air and fuel are intimately mixed in a one-way flow path around the disc including nonparallel and/or burred orifices in a perforate plate attached to the plunger. The fuel may be liquefied gas fuel in which case it may be vaporized by the combustion gases exhausted from the principal chamber to the surroundings through an annular exhaust zone coaxial of throttle passageways for carrying fuel from the metering piston to the principal chamber. Alternatively, a pressurized gas fuel may be used in which case the pressurized gas is utilized in the operation of the plunger.

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1. An internal combustion apparatus, said apparatus being of the intermittent operation type and comprising a cylinder, a stationary cylinder head arranged in said cylinder, a main operating piston reciprocable in said cylinder, resilient means for biasing said main piston toward a first or rest pos

1. An internal combustion apparatus, said apparatus being of the intermittent operation type and comprising a cylinder, a stationary cylinder head arranged in said cylinder, a main operating piston reciprocable in said cylinder, resilient means for biasing said main piston toward a first or rest position, said main piston being adapted to be driven from its first position to an operating position in response to intermittent ignition of an explosive mixture, said main piston being operatively connected to an operating member, the improvement comprising a plunger reciprocably mounted for operation independently of said main piston in a principal chamber in said cylinder defined by a space formed between said main piston and said cylinder head between a top end of stroke position adjacent said cylinder head and a bottom end of stroke position remote from said cylinder head, said plunger having a tubular column extending through an aperture in said cylinder head and containing a fuel passage therein, means for biasing said plunger toward said top end of stroke position, inlet means for admitting gas fuel and inlet means for admitting combustion supporting gas into an admission chamber formed between said cylinder head and said plunger in the course of displacement of said plunger between said top end of stroke position and its bottom end of stroke position, and a combustion chamber defined between said main operating piston and said plunger during its displacement from its bottom end of stroke position and its top end of stroke position, and one-way flow path means provided on said plunger operative in the course of displacement of said plunger between its bottom end of stroke position and its top end of stroke position to transfer the explosive mixture of fuel and combustion supporting gas to said combustion chamber. 2. Apparatus according to claim 1, wherein said admission chamber and said combustion chamber are both defined within the principal chamber depending on the position and displacement of said plunger. 3. Apparatus according to claim 1, wherein the plunger comprises a disc having a perforate plate on its side facing said main operating piston, wherein orifices in said perforate plate are arranged in said one-way flow path means for intimately mixing fuel with said combustion supporting gas. 4. Apparatus according to claim 3, wherein said apertures in said perforate plate are nonparallel. 5. Apparatus according to claim 3, wherein contours of said apertures in said perforate plate are burred creating a turbulent flow of fuel and combustion supporting gas. 6. Apparatus according to claim 3, wherein said disc has a diameter smaller than that of the principal chamber in said cylinder, wherein said one-way flow path comprises a peripheral recess or groove formed in the edge of the disc partially accommodating a sealng member between said disc and said perforate plate, the outer diameter of said sealing member being greater than the inner diameter of said principal chamber in said cylinder, said sealing member bearing alternately against said disc and said perforate plate depending on the direction of stroke of said plunger. 7. Apparatus according to claim 1, wherein said tubular column is slidably mounted in said cylinder head, said tubular column carries a source of liquefied gas fuel. 8. Apparatus according to claim 7, wherein complementary latching means provided on said cylinder head and a fuel tank comprising said source of liquefied gas fuel are operative to latch said plunger in its bottom end of stroke position, a trigger operatively connected to said latching means for releasing said latching means, resilient means operatively arranged between said fuel tank and said cylinder head for biasing said fuel tank to a raised rest position. 9. Apparatus according to claim 7, wherein said plunger has central exhaust orifice, a valve member controlling the opening of said central exhaust orifice, and a push button operatively connected to said valve member. 10. Apparatus according to claim 9, wherein said push button has a tubular extension defining a fuel metering piston slidably mounted in an axially sleeve fixed relative to said tubular column and communicating with said source of liquefied gas fuel. 11. Apparatus according to claim 10, wherein said plunger has an axial extension extending in said tubular column, splines disposed between said axial extension and said tubular column for forming throttle passageways for fuel, said passageways being adapted to be brought into communication with said metering piston to transfer a metered quantity of fuel. 12. Apparatus according to claim 11, wherein the metering piston comprises an annular groove, said metering piston being axially displaceable between a first position in which said annular groove is in communication with said fuel supply tank and a second position in which said annular groove is in communication with said throttle passageways. 13. Apparatus according to claim 11, wherein an annular zone is formed between the valve rod and said axial extension of the plunger, said annular zone being adapted to be in communication with the atmosphere through a tubular member mechanically connecting said valve member to said push button. 14. An internal combustion apparatus comprising a cylinder, a cylinder head arranged in said cylinder, a main operating piston reciprocable in said cylinder, resilient means for biasing said main piston toward a first or rest position, said main piston being adapted to be driven from its first position to an operating position in response to ignition of an explosive mixture, said main piston being operatively connected to an operating member, the improvement comprising a plunger reciprocably mounted in a principal chamber in said cylinder defined by a space formed between said main piston and said cylinder head between a top end of stroke position and a bottom end of stroke position, inlet means for admitting gas fuel and inlet means for admitting combustion supporting gas into an admission chamber formed between said cylinder head and said plunger in the course of its displacement between said top end of stroke position and its bottom end of stroke position, and a combustion chamber defined between said main operating piston and said plunger during its displacement from its bottom end of stroke position and its top end of stroke position, and one-way flow path means provided on said plunger operative in the course of displacement of said plunger between its bottom end of stroke position and its top end of stroke position to transfer the explosive mixture of fuel and combustion supporting gas to said combustion chamber, said plunger having an axial extension slidable along tubular member fixed relative to said cylinder, and valve means connected to said source of fuel which is pressurized, said valve means having a first position to bring said source of fuel into communication with said tubular member and said extension on said plunger for displacing said plunger to its bottom end of stroke position, and a second position for transferring a metered quantity of gas fuel from said extension and said tubular element to said admission chamber. 15. Apparatus according to claim 14, further comprising exhaust valve means arranged on said principal chamber proximate to said operating piston in its raised position. 16. Apparatus according to claim 15, wherein said exhaust valve means is disposed radially of said cylinder and connected to a trigger adapted to control said first-mentioned valve means between said fuel source and said tubular member. 17. An internal combustion apparatus, said apparatus being of the intermittent operation type and comprising a cylinder having a stationary cylinder head, a main operating piston reciprocable in said cylinder, resilient means for biasing said piston to a first or rest position, said main piston being adapted to be driven from its first position to an operating position in response to ignition of an explosive mixture, said piston being operatively connected to an operating member, the improvement comprising a plunger receiprocably mounted for operation independently of said main piston in a principal chamber in said cylinder between a top end of stroke position and a bottom end of stroke position, said plunger having a tuburlar column extending through an aperture in said cylinder head and containing at least one throttle pasageway therein, means for biasing said plunger toward said top end of stroke position, a source of liquefied gas fuel, means for bringing said source of gas fuel in communication with a metering chamber, means for transferring the metered quantity of gas fuel to said throttle passageway, means for venting products of combustion from said principal chamber to the atmosphere via a passageway contiguous with said throttle passageway, means for controlling the venting of combustion production from the principal chamber and for simultaneously controlling the transfer of a metered quantity of gas fuel to the throttle passageway whereby the combustion gases vaporize the gas fuel in the throttle passageway before entering the principal chamber where the vaporized gas fuel is mixed with combustion supporting air and then ignited.