US671931A

US671931A - Valve-gear for explosive-engines.

Info

Publication number: US671931A
Application number: US1759100A
Authority: US
Inventors: Robert Longtine
Original assignee: BRADFORD GAS ENGINE Co
Current assignee: BRADFORD GAS ENGINE Co
Priority date: 1900-05-22
Filing date: 1900-05-22
Publication date: 1901-04-09
Anticipated expiration: 1918-04-09

Description

. Iatentud` Apr. 9. |90I.

R. LONGTINE.

VVVVVVV AR'FDR EXPLUSIVE ENGINES.

(No Model.) 3 S eeeeeeeeeee l.

Ptented Apr. 9, |90l.

R. L'UNGTINE. VAL VE GEAR FORNEXPLOSIVE ENGINES.

(Application-filed May 22, 1900) 3 Sheets-Sheet 2.

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, IIIIIH Patented Apr. 9, |90I. R.- LUNGTINE.

VALVE GEAR FR EXPLOSIVE ENGINES.

(.'Appcaticn filed May 22, 1900) `UNITED STATES PATENT OFFICE.

ROBERT LONGTINE, OF BRADFORD, PENNSYLVANIA, ASSIGNOR TO THE BRADFORD GAS ENGINE COMPANY, OF SAME PLACE.

VALVE-G EAR FOR EXPLOSIVE-ENGIN ES.

SPECIFICATION forming part of Letters Patent N o. 671,931, dated April 9, 1901.

Application filed May 22, 1900I To (1J/Z whom t may concern:

Be it known that I, ROBERT LONGTINE, a citizen of the United States, residing at Bradford, in the county of McKean and State of Pennsylvania, have invented a new and useful Automatic-Out-Off Vacuum-Valve Mechanism for Gas and Gasolene Engines, of which the following is a specification.

My invention relates to an improvement -in gas and gasolene engines, one object of my invention being to provide speed-governorcontrolled devices for automatically operating the gas and air valves in unison and for regulating the operation of said gas and air valves,whereby the charges of gas and air will be reduced as the speed of the engine increases and increased as the speed of the engine decreases.

A further object of my invention is to provide a valve-chest with a removable head, which carries the gas and air valves and their connections, which construction of the removable head' and the valves enables access to be readily attained to the valves and greatly simplifies the construction of the engine and correspondingly reduces the cost thereof.

My invention consists in the peculiar construction and combination of devices hereinafter fully set forth, and pointed out in the claims.

In the accompanying drawings, Figure lis a perspective view of a gas-engine provided with a valve chest, removable head, and valves embodying my improvements. Fig. 2 is a vertical longitudinal sectional view taken through the valve-chest and valve-head. Fig. 3 is a detail perspective view of the valvehead, showing the same removed from the valve-chest. Fig. 4 is a horizontal longitudinal sectional view taken through the valvechest and valve-head on the line 4 4 of Fig. 2. Fig. 5 is a vertical sectional view taken on the line 5 5 of Fig. 2.

In the embodiment of my invention I provide a valve-chamber M, which is adapted to be bolted to the-engine-cylinder, as shown. The said valve-chamber is provided with the port K, which communicates with the cylinder, the exhaust-port P, the gas-port N, and the air-port O. The exhaust-port P is controlled by the valve R, which has an operat- Serial No. 17,591. (No model.)

ing-rod L, that is connected to and operated by a cam on the engine to open the inner end of the exhaust-port, a spring 10 being provided to normally close the exhaust-valve against the inner end of said port.

The outer end of the valve-chamber M is provided with a cylindrical opening 11, in which is itted a valve-head J, which is removable therefrom at will and is provided at its outer end with a iiange-plate 12, which conforms in size and shape with the crosssection of the valve-chamber M. Bolts 13 are employed to secure the valve-head in the opening 11, and thereby close the end of the valve-chamber M. The said valve-head J is provided with a port O', which registers with the air-port O, and a port N', which registers with the gas-port N. The inner end of the said valve-head is closed, as at 14, and is provided with a port 15, which is adapted to admit gas to the mixing-chamber 16 of the valve-chamber, and a port 17, which is adapted to admit air to said mixing chamber. A tubular bushing 18 is screwed in the valvehead, the axis of which is concentric with the port 15, and a similar tubular bushing 19 `is also screwed in the valve-head and has its axis concentric with the port 17. A gas-valve G is normally seated on the gas-inlet port 15, and an air-valve F is normally seated on the air #inlet port 17. The respective rods or stems 20 21 of said gas and air valves operate in and extend through the tubular bushings 18 19, and to the projecting outer end of the stem or rod 21 of the air-valve is secured one end of the yoke H, as at 22. A spring 23 on the stem or rod 21 bears between the inner side of the yoke H and the outer side of the valve-head, the function of said spring being to normally close the air-valve. An adjusting-nut 24 is screwed on the threaded outer portion of the gas-valve stem or rod 20, a spring 25 on said stem or rod being interposed between the outer end ofthe bushing 18 and the said adjusting-nut and serving to normally close the gas-valve, and a nut 26 on the outer threaded end of the gas-valve stem or rod 2O is provided with an annular groove 27, which engages an open slot 28 at the end of the yoke H opposite the connection 22 thereof with the air-valve stem or rod.

IOO

It Will be understood from the foregoing and by reference to the drawings that the gas and air valves and their connections are itted in, secured to, and entirely carried by the removable head J, which is fitted in the outer end of the valve -chamber, and that hence when said head J is detached from the valve-chamber said gas and air valves and their connections are detached with it, and that this construction of the removable valvehead and the gas and air valves enables access to be readily obtained to the gas and air valves and the same to be removed and adjusted readily as may be required. It will be further understood that by means of the yoke H, to which the stems or rods of the gas and air valves are connected, said gas and air Valves are adapted to operate strictlyin unison, being opened inwardly by the attenuation of air or partial vacuum created in the engine-cylinder and closed and moved outwardly against the gas and air inlet ports by their respective springs.

The valve-head J is provided on its outer side with the pairs of lugs or ears 29 30. A vertically-movable slide A travels between the said pairs of lugs or ears and is provided with slots 31, in which operate antifrictiourollers 32, revoluble on axles 33, that connect the pairs of ears or lugs. By this means the slide A is supported on the Valve-head. Said vertically-movable slide is provided on its outer side with a wedge-like cam 34, which engages the inner side of the yoke H, as shown. It will be understood that by raising and lowering said slide A the said yoke is permitted to move more or less toward the valve-head, and that hence the stroke of the gas and air valves may be regulated,the stroke of said valves being greatest when the slide A is at the upper limit of its movement, and by lowering said slide A suiiiciently said gas and air valves may be so controlled as to be permitted to open to only a very slight eX- tent, if atall.

The valve-chamber M is provided on its upper side, nearits outer end, with a pair of ears or lugs 35, between which a bell-crank lever B is pivoted, as at 36. The outwardlyextending arm of said bell-crank lever is loosely pivoted to the upper end of the slide A by a pin 37, which travels in a transverselydisposed slot 38, with which said slide A is provided, and the upwardly-extending arm of said bell-crank lever is connected,by means of a rod C, to a suitable governor, with which the engine is provided. The said governor is of the centrifugal type and may be of any preferred form and may be geared to and operated by the engine in any suitable manner. I have not shown nor more particularly described the governor and means whereby the same is operated, as this will be readily understood by those skilled in engines of this class.

It will be understood that upon an increase in the speed of the engine the governor,

through the rod C and bell-crank leve1'l3,Will lower the slide A, and thereby either reduce the stroke of the gas and air valves or cut the same off entirely, as may be required, hence either reducing the charges of gas and air fed to the engine or altogether pretermitting the same, and that upon a decrease in the speed of the engine the governor,through the valve C and lever B,will raise the slide A,and thereby increase the stroke of the gas and air valves, hence proportionately increasing the charges of gas and air.

It follows that the charges of gas and air are automatically controlled by the speed of the engine, and that by adjusting the governor as may be required the engine may be caused to operate at anydesired rate of speed.

From the inner end of the bell-cranklever extends a rod D, on which is screwed an adjustable counterweight E, the function of which is to counterbalance the slide A and bell-crank lever, and hence render the same responsive to the slightest variation in the speed of the engine.

Having thus described my invention, I claiml. In a gas or gasolene engine, a valvechamber having an exhaust-port, a mixingchamber, and gas and air ports, in combination with a removable head, fitted in an opening in the rear side of the valve-chamber, said removable head having gas and air ports communicating with those of the valve-chamber and with the mixing-chamber, gas and air valves carried by said removable valvehead and having their stems or rods projecting beyond the outer side thereof, a yoke secured to the projecting end of one of said rods and detachably secured to the projecting end of the other, a slide or key, carried by said removable head, said slide or key and said yoke coacting to limit the strokes of the gas and air valves, a bell-crank lever, mounted on the valve chamber and connected to said slide, a centrifugal governor operated by the engine, and a rod connecting said centrifugal governor to said bell-crank lever, substantially as described.

2. In a gas or gasolene engine, a valvechamber having an exhaust-port, a mixingchamber, and gas and air ports, in combination with a removable head, fitted in an opening in the rear side of the valve-chamber, said removable head havinggas and airports communicating with those of the valve chainber and With the mixing-chamber, gas and air valves carried by said removable Valvehead and having their stems or rods projecting beyond the outer side thereof, a yoke secured to the projecting end of one of said rods and detachably secured to the projecting end of the other, a slide or key, carried by said removable head, said slide or key and said yoke coacting to limit the strokes of the gas and air Valves, a bell-crank lever, mounted on the valve -chamber and connected to said slide, said bell-crank lever hav- IIO IZO

ing a counterbalancing-Weight, a centrifugal governor operated by'the engine, and a rod connecting said centrifugal governor to said bell-crank lever, substantially as described.

3. In a gas or gasolene engine, a valvechamber having an exhaust-port, a mixingchamber, and gas and air ports, in combination with a removable head, fitted in an opening in the rear side of the valve-chamber, said removable head having gas and air ports communicating with those of the valve-chamber and with the mixing-chamber, gas and air valves carried by said removable valvehead and having their stems or rods p'rojecting beyond the outer side thereof, a yoke pivoted to the projecting end of one of said rods, an annularly-grooved adj listing-nut on the projecting stem or rod of the other valve,

my own I have hereto aiiixed my signature in 3o the presence of two Witnesses.

ROBERT LONGTINE.

Witnesses:

THos. B. HOGAN, WM. DoBIE.