US463435A - mora m - Google Patents

Description

M. M. BARRETT 8v J. F. DALY.

OPERATING MEGEANISM EOE GAS ENGINES. No. 468,435.

(No Moden.)

Patented Nov. 1'7, 1891.

IH II Nrrnn 'TA-TES ATRNT Orricn.

MORA M. BARRETT AND JOHN F. DALY,- OF SAN FRANCISCO, CALIFORNIA, ASSIGNORS TO THE PACIFIC GAS ENGINE COMPANY, OF SAME PLACE OPERATING M-ECHA'NISM FOR GAS-ENGINES. Y

SPECIFICATION forming part of Letters Patent No. 463,435-,dated November 17, 1891. Application led April 16. 1891. Serial No. 389,255. (No inodel.)

To aZZ whom it may concern:

Be .it known that we, MORA M. BARRETT and JOHN F. DALY, citizens of the United States, residin gat San Francisco, in the county 'of San Francisco and State of California,

have invented cert-ain new and useful Improvements in Operating Mechanism for Gas- Engines; and we do hereby declare the following to be a full, clear, and exact description of said invention, such as will enable others skilled in the art` to which it most nearly appertains to make, use, and practicel the same.

Our invention has relation to certain new and useful improvements in the operating mechanism for gas-engines, which consists in the arrangement of parts and details of construction, as will be hereinafter more fully set forth in the drawings and described and pointed out in the specification.

Our present invention relates more particularly to certain improvements upon the mechanism for operating the exhaust-valve of gas-engines, fully set forth and described in Letters Patent No. 430,505, granted us on the 17th day of June, 1890. Practical working of machines constructed in accordance with the aforesaid Letters Patent No. 430,505 has demonstrated the fact that owing to the o liability of the slide-bar or rocking lever, which operates the exhaust-valve through the `medium of the valve-stem, becoming clogged or stuck damage ensues by reason of one or both parts breaking, due to the driving force exerted thereon. Such breakage necessitates cessation of work until repaired. 'We have further discovered that the swiveled switchpiece working in the grooved cam quickly wears out, thus necessitating constant repairs.

Our invention further consists in providing a speed-regulating attachment, whereby the unnecessary loss or expenditure of power to overcome the compressing of air contained Within the engine-cylinder is obvated, thereby creating a saving in the consumption of gas necessary to run the machine and overcoming undue Wear upon the engine. Heretofore with each downstroke of the piston the suction thereof caused au inflow of air into the engine-cylinder, 'which formed a cushion against the npstroke thereof, which necessarily had to be overcome by compression. IVe have discovered that by providing a speed-regulating governor, whereby the eX- haust-valve is held open until closed automatically, as hereinafterl described, by said governor, we create the air-suction through the exhaust-opening with the. downstroke of the piston and discharge thereof upon the 6o upstroke, thereby allowing of the piston working in free air, so to speak, so as to overcome the consumptionV of gas before necessary to effect the compression of air contained in the cylinder, and at the same time allowing of the engine -running for a longer time with each charge thereof.

f The object of ourinvention is to provide mechanism for operating the exhaust-valve which shall be simpler in'ts construction, 7o more effectual of operation, less expensive, and more lasting than any heretofore known to us. Y

Referring to the drawings forming a part of this specification, wherein similar letters of reference are used to denote corresponding parts throughout the entire specification, Figure l is a front view in elevation of a gasengine; Fig. 2, a side View in elevation showing our improved operating mechanism ap- 8o plied thereto; Fig. 3, a horizontal section on a plane above the crank-shaft; Fig. 4, detail front view of the operating mechanism, and Fig. 5 an end view thereof.

The letter A indicates the frame of the gasengine, and B the cylinder thereof, which, being of the ordinary kind, calls for no specific description herein. lVorking in bearings formed in frame A is the crank-shaft C, whichis operated by the engine-piston. (Not 9o shown.) The valve-stem is indicated by the letter E, which is adapted to to operate the exhaust-valve in order to allow of the enginecylinder clearing itself of spent gas. The spring E serves to hold the valve upon its seat, similar to that shown in Patent No. 430,505. Projecting from the frame A are lugs or ears f, between which upright F is movably secured, so as to allow for oscillation thereof. Secured upon and working roo with the crank-shaft C is the cam F', which is provided 'with intersecting grooves f fr Vithin said grooves fits and works the switchpiece g, which is secured to downwardly-extending arm g of upright F, and as said switch-piece moves from one groove to the other said arm is thrown in or out by reason of the upright being pivoted between ears f. Pivoted near the top of said upright, so as to allow for upward or downward movement, is the forwardly-extending arm H, the outer end of which is provided with the downwardly-extending toe h, which rests over cam F. Upon the outer face of said cam we secure in any suitable manner the shoe h', which contacts with toe h during the rotation of the cam, as arm I-I is thrown outward by the movement of upright F. When shoe h is carried around and contacts with toe 7L, the arm H is lifted upward, and inasmuch as valve-stem E rests thereon the latter is raised upward, so as to unseat the exhaust-valve and allow for the escape of the spent gas contained within the engine-cylinder. 1f so desired, the shoe may be formed integral with the cam, but by preference we make the same removable, inasmuch as incase of much wear thereon the same may be quickly removed and another put in piace thereof with very little delay being caused in the working of the engine. y

Upon the outer portion of shaft C is loosely secured the sleeve G, which is provided with grooves g3 g4, and upon the outer end is rigidly secured the collar G. Pivotally secured .to valve-stem guide g*2 is the stem i, to which is attached the spring-plate i', the end of" which is adapted to work in the `groove g3 of sleeve G. "Within groove g4 fit the pivoted arms 7c of governor K, the balls of which are connected by means of spring 7s. As the speed of the engine increases, the governorballs are'thrown outward and causes the out movement of sleeve G, and as the valve-stem is lifted through the before-described mechanisln the upper end of governor-stem t' is thrown inward by pressure of spring i until it rests under collar 71:2, fastened to the valvestem, and thus serves to support the valvestem and maintain the exhaust-valve open until the speed of the engine has reducethor worked down sufficient to cause the pressure ot' spring 71: to close or draw together the governor-balls, thereby moving the sleeve G back upon the shaft C and forcing the spring i to force the governor-stem t' from beneath collar 7a2, so as to allow the valve-stem to fall and seat the exhaust-valve. While the exhaustvalve is held open the enginedraws in and discharges air through the exhaust-opening, thus allowing the pistou to work in free air, inasmuch as upon its upstroke the indrawn air is discharged through the exhaust-opening. I-Ieretofore the exhaust-valve has closed immediately upon the discharge of spent gas. Consequently as the piston moved downward air was drawn into the cylinder through the air-passage and with its upstroke said air had to be compressed, thereby creating unnecessary wearnpon the machine and expenditure of gas. This we completely overcome by the present device.

We are aware that minor changes may bc made in the arrangement of parts and details of construction without causing or necessitating a departure from the nature and scope of our invention.

Having thus described our invention, what we claim as new, and desire to secure protection in by Letters Patent of the United States,

1. The combination, with the operating-cam provided with intersecting grooves, swiveled upright,arm projecting down wardly from said upright, switch-piece secured to said arm and working in the intersecting grooves, and pivoted arm extending forward from the upright, said arm adapted to be uplifted during the rotation of the cam, so as to unseat the valve through the medium of the valve-stem, substantially as and for the purpose set forth.

2. The con1bination,\vith the operating-cam provided with intersecting grooves, of the swiveled upright connected to the engineframe, and switch-piece working in the intersectin g grooves and adapted to throw the valvelifting mechanism in or out of contact with the rotating cam,substantially as and for the purpose set forth.

In testimony whereof we aiix our signatures in presence of two witnesses.

MORA M. BARRETT. JOHN F. DALY. Witnesses:

N. A. ACKER, J. W. KEYS.

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