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Publication numberUS567530 A
Publication typeGrant
Publication dateSep 8, 1896
Publication numberUS 567530 A, US 567530A, US-A-567530, US567530 A, US567530A
InventorsGeorge Henry Willetts
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
US 567530 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

(N-o Model.)


Patented Sept: 8

ESSEN plosive-Engines; and I do declare the follow-- UNITED STA- TES vPATENTA OFFICE.



SPECIFICATION forming pari; o f Letters'lgat.ent o. 567,530, dated September 8, 1896. Application led November 30, 1895. Serial No. 570i6'l9'. (No model.)`

To (all 'uf/mln, nt/ty concer/t: `v v Beit known that I, GEORGE HENRY WIL- LETTS, a citizen of the United States, and a resident 0f Zelienople, in the county of Butler and State of Pennsylvania, have invented certain new and useful Improvements in EX ing to be a full, clear, and exact .description of the invention, such as will enable others skilled in the art to which it` appertains to make and use the same, reference being had to the accompanying drawing, and to letters of reference marked thereon, which forms a part of this specification.

The figure of the drawing is a representation of a central vertical longitudinal section of engine. i f

The object of this invention is to provide an explosive-gas engine of improved character and the invention lconsists in the novel construction and combination of parts, all as hereinafter described, and pointed out in the appended claims.

Referring to the accompanying drawing, the letter A designates an elongated openended cylinder, having therein partition heads or walls B B', which divide its interior into a central chargingchamber C and end power-chambers D and E.

F designates a Water-jacket which surroundsV the inner Wall or shell of the said cylinder.

f is the water-inlet, and f the outlet thereof. y

G designates a piston-rod which is common to the three cylinder-chambers and extends through the Walls or heads VB B. g g are metallic packings for said rod where it passes through the said walls or heads.

His a trunk-piston in chamber E, and to which one end of the piston-rod is connected. The use of this form of piston enables me to do away with slides, the connecting-rod I being connected directly thereto.

J designates a second piston, which Works in the charging-chamber C, and K is a third piston, which works inthe power-chamber D.

L designates the gas and air inlet, from which lead two ports or passages Z Z, which communicate with the charging-chamber C near the respective ends thereof. Z2 Z3 are valves which control the said ports and which `Walls or heads B B `spectivelythe chambers D and E with the 4chamber C. said ports and which open toward the respective chambers D and E.

`theignitiony or hot tubes for the said chamare normally held to their seats by the action of springs Z4.

la 1c are ports in the respective partition p and which connect, re-

7a2 7c3 are valves which control k are springs which are seated around the said stems h5 for 6o the purpose of reseating the valves.

M M are the exhausts for the respective chambers D and E, and which communicate with the central portions thereof. N N are bers.

The operation is as follows: Supposing the piston-rodand its pistons to be on the for- Ward stroke, a vacuum is created in the chamber C behind the piston J which causes the 7o valve L3 to unseat and gas and air to be drawn into that end of said chamber. At the same time the valve k2 is forced open by the cornpressi'on of the air and gas upon the opposite side of the piston J, admitted upon the pre- 75 viousstroke, which air and gas then iiow into the chamber E. This inflow of gas and air cleans out the chamber E, (the exhaust being open.) As soon as the pressure in chambers E and() becomes equalized, or nearly enough 8o so to balance the valve k2, the latter is closed by its spring. The piston is now upon its return stroke, and the air and gas are compressed in the chamber E by the piston H until the explosion takes place, which occurs at the 8 5 time the limit of the return stroke is reached. During this same stroke the valve cgis opened and the air and gas previously admitted to the chamber C behind the piston J are forced into the chamber D to be compressed by piston K upon the next forward stroke. At the same time a new charge of air and gas isbeing admitted behind the piston J. It will be noted that the piston-rod is always under tension.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In an explosive-gas engine, the combination with the cylinder having a central chargroo ing-chamber and a power-chamber at each end thereof communicating with the chargmunieating With each of the power-chambers by a port through its end wall, spring-actuated valves for controlling said ports, an eX- haust-port and an ignition -tube for each power-chamber, and two valved air and gas inlet ports comm unieatin g with the respeetive end portions of the charging-chamber, of the piston-rod common to all of said chambers, and the three piston-heads carried by the said rod, one for each of the said chambers, the forward of said pistons being of trunk form, substantially as speeied.

3. In an explosive-gas engine, the eombination With a cylinder having two power-Chainbers and an intermediate charging-chamber communioatingwith each of the power-Chambers by a Valved port through its end Wall,

said chambers having suitable inlet and exhaust ports, of the piston-rod common to all three of the chambers, and the three pistons carried by said rod, one in each chamber, the forward piston being of trunk form, substantially as specified.

4. In an explosive-gas engine, the elongated cylinder having therein two diametri@ partitions, forming a central or Charging chamber, and two end or power chambers each of which communicates with the central chamber through one of said partitions, a springaotuated valve for controlling eaoh of said port-s, and a centric piston-rod common to the three Chambers, and carrying a pistonhead in each, said central or charging chamber having a valved inlet-port communicating with each end portion thereof, and the end or power chambers having each an eX- haust-port at its outer end portion and an ignition device at its inner end portion, ysubstantially as specified.

In testimony whereof I affix my signature in presence of two witnesses.




Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2534590 *Jun 12, 1947Dec 19, 1950Gerhardt Fred PPower unit
US4385597 *Jul 21, 1981May 31, 1983Frank StelzerTwo-stroke internal combustion engine
US5285752 *Apr 23, 1993Feb 15, 1994Single-Stroke Motors, Inc.Internal combustion engine
US7942116Mar 30, 2005May 17, 2011Jean-Louis MajorDouble action piston assembly
CN100432387CMar 30, 2005Nov 12, 2008让-路易斯马若尔Double action piston assembly
WO2005095770A1 *Mar 30, 2005Oct 13, 2005Jean-Louis MajorDouble action piston assembly
Cooperative ClassificationF02B75/28