US430505A

US430505A - Gas-engine

Info

Publication number: US430505A
Authority: US
Publication date: 1890-06-17
Anticipated expiration: 1907-06-17

Description

(NoModeLf V 2Sheets-Sheet 1. M. M. BARRETT & J. P. DALY.

GAS ENGINE.

No 430,505. Patented'June 17, 1890" (No Model.) 0 I r 2Sheets-Sheet 2. M. M. BARRETT & J; F. DALY.

GAS "ENGINE. 7 No. 430,505. Paten-ted'June 17, 1890.

InmznTurs;

UNITED STATES PATENT OFF CE.

MORA M. BARRETT AND JOHN F. DALY, OF SAN FRANCISCO, CALIFORNIA.

GAS-ENGINE.

SPECIFICATION forming part of Letters Patent No. 430,505,'dated June 17, 1890.

I Application filed November 27, 1889. Serial No. 331,781. (No model.)

To aZZ whom it may concern.-

Be it known that we, MORA M. BARRETT and JOHN F. DALY, citizens of the United States, residing in the city and county of San Francisco, and State of California, have invented new and useful Improvements in Gas- Engines, of which the following is a specification.

The present improvements are applied to gasengines of the upright kind, and they relate to novel valve mechanism for operating the exhaust-valve, to a novel electric ignitor on an open circuit for exploding the charges of gas in the cylinder, and in connection therewith a current-interrupter adapted to break the circuit at every alternate revolution of the crank-shaft.

The nature of these improvements and the manner in which we have constructed and applied the same for operation, with the parts and mechanism necessary to produce an operative engine, will be understood from the following description and the accompanying drawings.

Figure 1 represents an upright engine with our said improvements applied to it, the cylinder, piston, and parts of the frame being shown in section. Fig. 2 is an elevation taken from the left-hand side of Fig. 1, with the head and upper part of the cylinder in section. Fig. 3 is a horizontal section at about the line w w and looking toward the head of the cylinder. Fig. 4 represents the parts of the electric ignitor in side view and on a larger scale. Figs. 5 and 6 are views of the Valve-0peratin g cam and connected parts.

A indicates the frame of the engine, B the cylinder, and C the piston.

D is the crank-shaft, and E the piston-rod connecting the piston directly to the shaft.

The gas-inlet is seen at F and the exhaust at G, with valves H and I controlling the same.

1* is a spring on the valve-stem 1 holding the valve to its seat, and K is a cam acting on the valve through the following parts to raise and hold it open at the time of exhaust while the cylinder is being cleared of spent gas, and to close the exhaust at the beginning of every alternate downstroke, when a fresh charge of gas is drawn in. The cam K, fast on the crank-shaft, moves a slide-bar L, and

a rocking lever M, pivoted at M is attached at one end to the slide-bar, while the other end terminates in a curved toe M*. This part is forked to embrace the valve-stem, and it sets directly againsta collar or tappetp on the stem, and the foot of the stem has a working fit in a guide a on the front of the bracket.

The slide-bar has bearings in the bracketpiece A on the frame above the cam, and a swiveled switch-piece L is fixed in the slide to work in the groove of the cam. The rockingilever is attached by a slot and pin to the lug M on the slide. These parts are so adjusted that the valve is lifted and held open at every alternate upstroke of the piston but is closed at the beginning of the succeeding do'wnstroke and is kept seated during the following upstroke and until after the explosion takes place. It is raised and held open during the upstroke following the explosion to clear. out the cylinder of spent gas, and is released by the cam and closed by the spring as the piston reverses and begins its downstrcke, at .which time the inlet-valve yields to the pressure of the gas from the supply outside, and a fresh charge is drawn in by the downstroke of the piston. Both valves are closed also during the following upstroke, and the gas is compressed to a certain degree before the charge is fired. As the ignitor is required to act only at every alternate upstroke, it is thrown out of operation by interrupting the electric current at such times.

S and T are the two electrodes or contactpoints of the ignitor. The part S is a iiexible yielding tongue of metal fixed at one end in an insulated plug 8* and setting through the side of the cylinder into the space above the piston, and the part'T is a finger or projection on a short rock-shaft T that sets through and has movement in an insulated bearing T in the side of the cylinder. Rocking movement is given to this shaft by an arm U on the outer end of an eccentricrod V and an eccentric V fast on the crankshaft. close relation to the free end of the yielding tongue. By the rocking movement of the shaft it is pressed against and drawn over The finger T sets in line with and in nitor is found to produce a better quality of and the subsequent separation when thefin-- ger clears the tongue.

As thus constructed for operation, this igthe kind where the contact and pressure of one part against the other is from one side or in one direction only. In connection with these parts provision is made for cutting off the current at every alternate upstroke of the piston when contact between the two electrodes is made; but no spark is required, the object of which is to prevent Waste and economize the battery-power. The circuit from the battery to the tongue is taken through the contact-spring Won the end of the slide-bar, and the spring W, fixed to the bracket-piece A ,or to some convenient part of theframe in line with the slide-bar. The conductor Y is connected by a binding-screw Z to the spring WV, and a conductor Y* makes electric connection between the spring W and the tongue S. The slide-bar makes and breaks contact between the two springs WV W and is suitably timed in its movements j to close the circuit at the upstroke when the firing-spark is to be produced. The cam and slide-bar thus operate the exhaust-valve and The yielding tongue also recontrol the electric circuit of the igniting device.

The ignitor and current-interrupter above described are made the subject-matter of a separate application for patent filed on even date with this application and designated by Serial No. 331,782, dated December 12, 1889.

Having thus fully described our invention, what we claim, and desire to secure by Letters Patent, is

1; The combination of rotating cam on the engine-shaft, slide-bar, swiveled switch-piece,

rocking lever, valve-stem, and tappet, arranged for operation as set forth.

2. An electric ignitor for gas-engines, consisting of a flexible tongue forming one eleca trode or terminal, and an oscillating finger forming the other terminal and adapted by its movements to act with a wiping movement against the flexible terminal first in one direction, or downward, and then in the contrary direction.

3. The combination of the yielding tongue S, shaft T*, carrying a finger or projection,

and mechanism giving said shaft rocking movement,-by which the finger is drawn against and off the end of the yielding tongue 'first in one direction and then in the contrary direction.

4. In combination with the tongue or part forming one terminal of the electric circuit,