US1542578A - Internal-combustion engine - Google Patents

Description

June 16, 1925. 1,542,578

B. R. POOL ET AL INTERNAL COMBUSTION ENGINE Filed Dec. 28, 1923 I movable Patented June 16, 1925.

" UNITED STATES PATENT OFFICE.

BYRON B. POOL AND ANDREW E; POOL, OF NORRIS CITY, ILLINOIS.

mrnnnan-comnusrron ENGINE.

Application filed December 28, 1923. Serial No. 683,189.

To all whom it may concemfl Be it known that we, BYRON R. POOL and ANDREW E. POOL, citizens of the United States, residin at Norris City, in the county 6 of White and tate of Illinois, have invented certain new and useful Improvements in Internal-Combustion Engines, of which the following is a specification. v

-This invention relates to internal combustion engines and has more particular reference to a combustion engine of the two cycle type, the primary object of this invention bemg to substantially improve the manner in which the explosive mixture is com-- pressed before passing to the firing chamber.

A further object of the present invention is to provide an internal combustion engine of this typewherein both the up and down stroke of the engine piston efiectively compresses to a high degree the explosive mixture.

A still further object resides in the provision of an internal combustion engine wherein the expensive and complicated con struction nownecessaryfor the compression the engine may be readily knocked down when repairs or renewal of parts is necessary. I

, With the above and other objects in view .as the nature of the invention will be better 35, understood, A comprises the novel form,

' combination and arrangement of parts, hereinafter'more fully described, shown in the,

accompanying drawing and claimed.

In the drawing wherein like reference characters indicate corresponding parts throughout both of the views,

Figure 1 is a detail, vertical cross sectional view of an internal combustion engine constructed in;.'accordance with the present invention, and

Figure 2 is a side elevational view of the piston element of the present invention.

Now having particular reference to the drawing, my novel internal combustion engine constitutes the provision of a crank case 5, a block 6, and cylinder head 7, rigidl joined together in any desirable and we 1 known manner, it being noticed from'a consideration of the detailed view, that' said head 7 is of slightly lesser internal diameter than the internal diameter of the circular portion 801? said block 6.

Rigidly positioned within the block 6 a its circular portion 8 thereof, is a vertically arranged hollow stationary piston 9 that terminates at its upper end within the lower end of the cylinder head 7. This. hollow piston 9 is of considerably less diameter than the diameter of the circular portion 8 of the block 6 so as to be positioned within said circular portion of the block in spaced relation thereto. The lower end of this piston 9c terminates in an outwardly extending flange 10 whereby the same may be secured throu h the medium of bolts 11 to the lower end 0 said circular portion 8 of the block.

Rectilinearly movable within the cylinder head 7 is a relatively long, hollow piston 12 that is open at its lower end and formed at its upper end with a solid head 13. The lower end of the hollow movable piston 12 is increased in thickness at its lower end to provide an annular rib 14 and this rib is ada ted to slidably contact the, inner surface oft e wall of the enlarged lower portion of the cylinder.

The present combustion engine obviously includes a crank shaft 15 to which is opera tively connected the lower end of a connecting rod 16, the upper end of said connecting rod being connected to the lower end of the rectilinearly movable hollow piston 12, it.

being of course necessary that said stationary hollow piston 9 be provided with slots 17 upon diametrically oppositesides thereof for allowing a connection-between said connecting rods 16 and said hollow piston 12.

The c lindrical or circular portion 8 of the bloc 6 is formed at one side with an enlargement that is formed at its u per end with a valved intake opening 18 that communicates with a passage 19 formed in an enlar ed portion of the lower end of the 'cylin or head 7 that terminates within said cylinder adjacent its lower end thereof.

The valve structure designated generally by the reference character 20 is conventional and does therefore, not enter into the spirit and scope of the present invention, it being however noted that the arrangement of the intake valve per se, is such as to revent the same from receiving the direct orce of the ex losive charge that'occurs in the upper end 0 the cylinder 7. It will, therefore be readily appreciated that there will be little or no liability of the valve per se becoming fouled warped or the like, due to the great heat that is now in similar t pes of engines imparted directly to the va ve. The rectilinearly movable hollow piston 12 is formed upon its side adjacent the intake opening with a vertical series of horizontal slots 21 whereby upon the upstroke of the piston 12, a supply of fuel will be drawn through the intake opening 18, passage 19 and thence within said hollow piston through the slots 21, it being of course understood that on the upward stroke of the piston, the valve member per se is in its raised position as shown in Figure 1.

Upon the previous down-stroke of the 1ston due to the explosion of the gases wit in the upper end of the cylinder, occasioned by a suitable sparking means 21. The gases within the piston 12 will be compressed between the head of this piston and the head of the stationary piston 9, these compressed gases being forced into the passage 19. Just before the piston 12 reaches its ddwnward limit of movement, the exploded gases will pass out of the exhaust port 23 immediately after which the compressed gases within the passage 19 will pass outwardlythereirom and strike'a deflector 25 formed upon the upper end of the hollow piston 12. On the upstroke of this hollow piston the gases will be additionally compressed and immediately fired by said sparking means as soon as the piston reaches its upward limit of movement after which it repeats the operation just described; I

For preventing the possible accumulation of any of the explosive gases within the crank case of the engine, which would probably be carried into the crank case through the provision of the slots 21 in the piston 12, a passage 26 is provided between theextreme lower end of the cylinder 7 and the discharge end of the intake opening 18, and this at a point directly beneath the usual valve elements, it being. obvious that any gases that would accumulate within the slots of the piston 12 will pass back into the intake through said slot 26 and thereby preclude any liability of said gases entering the crank case of the engine.

It will thus be seen that I have provided a highly novel, efiicient and compact form of two cycle internal combustion engine and one wherein the disadvantageous crankcase compression feature is departed from.-

I do not wish to be limited to the specific structure of the engine shown because in the future practice of the invention, minor changes may be made therein without departin from the spirit and scope of the appende claim.

Having thus described my invention, What I claim as new and desire to secure by Letters Patent is In an internal combustion engine, a crank case, a comparatively long cylinder carried thereby, a valved fuel intake disposed between the ends of said-cylinder, a stationary piston attached to said crank case at its lower end and extending up into said cylinder, said stationary piston being of a diameter less than that of the cylinder, the cylinder being increased in diameter at its lower end to provide an annular space between its inner wall and the stationary piston, a mov able piston mountedfor reciprocation within said cylinder, the wall of said movable piston being interposed for sliding move ment between the Wall of the cylinder and said stationary iston, the lower end of said movable piston eing'increased in thickness to provide an annular rib, said rib being in slidable contact with the wall of'the enlarged portion of the cylinder, the wall of said movable piston being formed intermediate its ends with a multiplicity of fuel intake ports adapted for coaction with the aforesaid fuel intake, a baflle mounted on the upper end of said movable piston adapted to e disposed opposite the valved fuel intake at predetermined intervals, an operating means for the movable pistonv for alternatively compressing fuel charge between the two pistons and then between the movable piston and the top of said cylinder.

In testimony whereof we allix our signatures.

BYRON R. POOL. ANDREW E. POOL.

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