US727777A - Explosion-engine. - Google Patents

Description

No. 727,777. I l PATENTED MA'Y 12, 1903.

` L'. M. FOSTER.

EXPLOSION ENGINE.

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UNITED STATES vLUCIAN M. FOSTER, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO UNITED Patented May 12, 19.

PATENT OFFICE.

STATES CONSTRUCTION AND ENGINE COMPANY, A CORPORATION OF MAINE.

EXPLOSION-ENGINE.

SPECIFICATION forming part o'f Letters Patent N 0. 727,777, dated 'May 12, 1903.

Application file'dSeptemher 12) 1900. Serial No. 295796. (No model.)

To @ZZ Awhom/it may concern,.- A

Be it known that I, LUorAN M. `FOSTER, of Boston, county ofiSulolk, and Stateof Massachusetts, have invented an Improvement in Explosion-Engines,'of which the following description, in l,connection with Vthe accompanying drawings, is a specification, like letters on the drawings representing like parts.

The present invention relates yto an explosive-engine, and is embodied in a novel construction and arrangement whereby a Variable stroke of the reciprocating member or piston is obtained for the purpose in a fourcycle engine ot' clearing the cylinder at every other stroke by causing the piston to move wholly to the end of the cylinder and at alternate strokes to provide a space for the (3h/arge by causing the piston to stop before it reaches the end of the cylinder.- This isaccomplished in accordance with the present invention by interposing between the piston and its connecting-rodor pitman a yielding connecting.

device of novel construction and arrangement, the normal positionof said pitman and vpiston being such that the piston during the instroke will travel substantially to the end .of the cylinder, this being the condition during the exhaust-stroke of the engine. During the alternate strokes, however, when a charge has been admitted to the cylinder the.

- a larger charge, so that uniformity in the quality of the charges will be secured under diiferent conditions of power and speed, as is desired for governing purposes. f

In accordance with the `invention the piston is connected'with the crank through the agency of a pitman, and the pitman is yieldingly connected with the piston through the agency of a coupling ,member and yielding Vconnecting device, such as a spring, the coupling member being jointed to the pitman and having a bearing against a supporting-surling member having a yielding connection with the piston, so that the actual position of the piston may be varied with relation to the pitman for the purpose above stated.

Figure 1 is a longitudinal vertical section of a cylinder and piston constructed in accordance with the invention, the other operating parts of the machine, with the exception of the crank and shaft, being omitted, the parts in this View being shown as at the end ot'v the exhaust-stroke; Fig. 2, a similar view showing the parts after the beginning of the next stroke, during which period' the charge is beingjntroduced into the cylinder; 'lFig.. 3, a similar view showing the piston in an intermediate position, and Fig. 4 a simiiar view showing the piston at the end of the .compressionrstroke Thepiston or reciprocating member b is contained in the cylinder a in the usual way, the said cylinder being `provided with the proper mechanism for the admission and exhaustof the charge, the ignition of the same, &c., these parts not being shown, since they may be of any ordinary construction.

In accordancewith the invention the piston instead of being rigidly connected with the crank A2 of the main or driving shaft A is yieldiugly connected therewith through the agency of a spring or equivalent yielding connecting device c, by means of which the pitthe agency of a coupling member or rocker d2, which is jointed' at d3 to the connectingrod or pitman d, the said rocker coasting with a bearing-face b2, formed in the piston b, one of the said cooperating bearing parts or faces being curved, the rocker d2 being herein shown as having a curved surface. The rocker is held in engagement with the bearing-face b2 by means of a coupling member d4, which is connected with a plunger d5, between which and the rear of the bearing-face i face connected with the piston, the said coupman d and the piston b are connected through h2 is interposed the spring c. It is obvious,

therefore, that the piston as a whole can move independently of the pitman d, for the reason that the spring c will yield, thus permitting the point where the pitman d and the rocker d2 are jointed to move toward the bearing-face b2, the movement in the opposite direction taking place when the spring expands.

In Fig. l the parts are shown in normal position, the piston being substantially in contact with the end of the cylinder, so that if the exhaust-valve is open the cylinder will be completely cleaned of the products of combustion of the previous charge. In the operation of a four-cycle engine during the next outstroke the inlet-valve will be opened, and as the piston travels outward the fresh charge will be drawn in ready for compression during the next instroke, during which the inletvalve will be closed, the piston being shown in Fig. 2 as having traveled part way out. When, therefore, the piston starts back with the fresh charge confined in the cylinder, it will tend to compress the said charge, and the spring will yield to such extent as is necj essary, the parts finally coming to approximately the position shown in Fig. 4, with the compressed charge inclosed in the space behind the piston, the compression of the charge depending upon the strength of the spring, since the movement of the jointed end of the pitman is constant. The charge being ignited will expand andact upon the piston in the usual way, and at the end of the outstroke the exhaust will be open, so that dur- 1 ing the next inst-roke the action ofthe spring will not be resisted, leavingthe piston free to travel completely tothe end of the cylinder to fully clear the same of theprodncts of combustion.

I claim- 1. An explosive-engine comprising a reciprocat-ing member, such as a piston, having a bearing-face, a coupling member jointed to the connecting-rod or part which receives m0- t-ionfroin the piston and adapted to stand at dierent angles with the connecting-rod', said coupling memberhaving a complemental bearing-face, and a yielding connection between the two members, whereby a yielding contact is maintained between the said bearing-faces, one of said faces being curved.

2.- An explosive-engine-comprising a reciprocating member, such as a' piston, having a bearing-face, a coupling member jointed to the connecting-rod or part which receives motion from the piston and adapted to stand at different angles with the connecting-rod, said coupling member havin-g a complemental 6o bearing-face,4 a rod jointed to the outer portion of said coupling member, and a spring' interposed between a bearing on said rod and a bearing on the piston, whereby a yielding contact is maintained between the said bearing-faces, one of said faces being curved.

3. An explosive-engine comprising a piston having a fiat bearing-face, a coupling member jointed to the connecting-rod which receives motion from the piston and having a 7o curved bearing-face resting against the fiat bearing-faceof the piston, a rod jointed to the outer portion of the coupling member, and a. spring interposed between a bearing on the outer portion of the rod and a bearing on the piston, whereby a yielding contact is maintained between the said bearing-faces.

4. An explosive-engine comprising a re'- cessed piston, a fitting seated in the recess of the piston and having a flat bearing-face, a 8o coupling member jointed to the connectingrod which receives motion from the piston i and having a curved bearing-face resting against the said fiat bearing-face, a rod jointed to the outer portion of the coupling member and extending through the said fitting into a. cavity between the fitting and the head ofI the piston, a bearing-head jointed to the outer portion of the rod, and a spring interposed between the said bearing-head andthe fitting. 9o 5. An explosive-engine comprising apiston Vhaving a flat bearing-face, aconpling member jointed to the connecting-rod which receives motion from the piston and having a curved bearing-face resting against the flat bearing; face of the piston, a rod jointedto the outer portion of the coupling member, a spring interposed between .a bearing on the outer portion of the rod and a-bearing on the piston, whereby a yielding contact is maintained bero: tween the said bearing-faces, and a couplingretainer on the piston having avsegmental re.- taining-face engaging a portion of the coup` ing.

Intestimony whereot` I have signed my ieg name to this specification in the presence ofA y two subscribing witnesses.

LUCI'AN M. FOSTER.

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