US849769A - Sparking device for internal-combustion engines. - Google Patents

Description

PATENTED APR-. 9, 19Q7.

v F. W. BRADY. SIPARKING DEVICE FOR INTERNAL COMBUSTION ENGINES.

APPLICATION FILED AUG. 11, 1904;

2 SHEETS-SHEET l.

witnesses,

No. 849,769. PATENTED APR. 9-, 1907.

i F. W. BRADY. 1 r

, SPARKING DEVICE FOR INTERNAL COMBUSTION ENGINES.

APPLICATION FILED AUG. 11, 1904. v

z SHEETS-SHEET -2.

Englewood, in the county To all 'whoin, it may concern:

FRANCIS W. BRADY, or EueLEWoon, NEW JERSEY.

SPAR-KING DEVICE FOR INTERNAL-COMBUSTION ENGINES.

Specification of Letters Patent;

Patented April 9, 1907.

Application filed'hugnst 11,1904. Serial No. 220.380.

Be it known thatI, FRANCIS W.- BRADY, of of Bergen and State of New Jersey, acitlzen of the United States, have invented certain new and useful Improvements in Sparking Devices for In-- ternal-Combustion Engines, of which the following is a specification.

This invention relatesto electrical igniting devices for engines of the internal-combustion type, and the object is to provide a simple, reliable, and durable device for the pur- 'pose,-as will be hereinafter described.

' parts clearly. 5

.is the cam-sha t.

metal.

. In the accompanying drawings, which illustrate an embodiment of the invention,

Figure 1 is a side elevation of an internal-' combustion engine provided with the igniter, the lower portion of the engine being 111 section. This view, which is on a small scale, is mainly designed to illustrate the relation and application of the ignition device to--the engine. view on a much larger scale, showing the Fig.3 is a plan View of the parts seen in Fig. 2.' Fig. 4' illustrates a slight modification, which will be hereinafter described;

Referring'to Fig. 1, 1 is the bed late or base of the en inc. 2 isthe main s aft. 3 4 is the cylinder. 5 is the vaporizer, and 6 is the combustion-chamber. These features relate to the present invention-only so far as to illustrate the application of the latter to an engine. i

Referring now to Fig. 2, 7 designates abushin set and fitting snugly in a bore in the wall 0? the-combustionchamber 6. This bushing willbe of porcelain or other refractory insulating material and be provided with an external shoulder 8 to engage the It is held in place by a plate 9 and screws 10. In this tubular bushing 7 is fitted a metal electrode 11, havin a shoul-' der at 12, fitting up to an interna shoulder on the bushing, and a reduced screw-threaded portion 11, which protrudes exteriorly from the bushing, and has nuts 13 to draw the electrode tightly up into the bushing.

Set in the wall of the combustion-chambei') at a right angle to the axis of the bushing 7 cur d y screws 15, Fig. 3, and in this bushing is slidably mounted. a metal electrode '16', having a shoulder at 17 and a'reduced extereiere'nce is a metal bushing 14;, se'

rior portion.

Fig. 2 is a vertical sectional detail the tubular bushing 14 is enlarged to form a housing-cup 18, and the bore in the bushing is also enlarged at its outer end to receive an externally-screw-threaded tubular nipple 19, on which is screwed ,a nut 20, bored to form -a guide for the'reduced portion of the electrode 16'and also to serve as an adjustable stop to engage. the shoulder 17 on the electrode and limit its movement outward. On the outer endof the electrode 16 is secured a housing-cup 21 and between this cup and Theexterior part or head of the cup 18 is disposed a coiled rctractingspring '22,. which is normally. under some gomlpression and holds the electrode 16 drawn The electrode 16 is so alined axially with respect to the electrode 11 that when pressed in its tip will contact with said electrode 11, and the tips of. said electrodes, or, indeed, the whole of that portion of each electrode exosed within the combustion-chamber, may e made of or covered with some non-oxi dizable refractory conducting metal, such as platinum.

In Fig. 2, B designates diagrammatically any source of electricityas abattery, for, ,-exampleand c c conductors leading from the respective poles thereof to the electrodes 11 and 16. As theelectrode 11 is insulated,

one of the conductors leads directly to said electrode at the nuts 13; but as the electrode 16 is not insulatedthe other conductor is electrically connected with the metal wall of the combustion-chamber through a metal screw 8. Obviously when the metal electrode 16 is pressed in until its tip is in contact with the electrode 11 a current of electricity will flow through the closed circuit thus established, and if the pressure on the electrode 16 be removed the spring 22 will retract said electrode and break the circuit, and a spark willbe produced in the combustion-chamber 6 between the two electrodes at the break. I

It will be noted that the movable electrode is metallically mounted-that is,

insulating material is not interposed between it and the walls of the combustionchamber. -,Tl1e two electrodes are insulated from each other by i1 isul aiing the stationary electrode. None oi the insulating materials in common use are ad apied LO ail'ord a bearing-surface for the moving electrode, and in insuiating it, as is now the practice, it is necessary to provide the insulating-bushing with expensive, and even i then the insulation is liable to become broken Moreover,

a metallic lining, which is and the bearing become loose.

according to the present invention contact I with the movable electrode can be made through the bearing nal of the electrical source to a wall of the combustion-chamber,and thus the necessity of securing an electrical connection to the moving electrode and consequent wear of the connection and hampering of the movement of the electrode are avoided.

cuit through the electrodes by pressing in the pin 16 will now be described.

A rocker 23 has an upright arm so disposed as to take between cheeks 21. on the cap 21 and bear on the electrode 16 indirectly through a cushion-spring 23 on said arm. This rocker turns about a fulcrum or pivot 24 and has an is engaged by a trip 26 on the end of an eccen- Iric-rod 27. This rod (see Fig. 1) has at its lower end a strap which embraces an eccentric 28 on the cam-shaft 3 of the engine, and said rod is pivoted at 29 to a'vibratable link 30. The cam-shaft 3 is driven from the main to re turn the shaft of the engine by gearing in a well-known way, not necessary to be herein described. As the eccentric 28 rotates it imparts motion to the trip 26in an endless path of somewhat modified circular form, causing the hook-like trip 26 to rise, move over, engage the arm 25- of the rocker, draw it down, and operate the rocker so as to cause the upright arm of the latter to press the electrode 16 into contact with the electrode 11, and then in its further moven1ent wipe off from said arm, thus allowing the spring 22 to retract the electrode 16, so as to produce the spark,- the rocker bein also returned to its first position by sai spring.

The trip will be hardened, and the arm 25 of the rocker, which the trip engages, is provided with a hardened plate 31 to take the wear.

The operation is as follows: When the charge is compressed in the chamber of the engine and the piston of the engine is near the end of its stroke, the trip engages the arm of the rocker 23 and through thelatter presses the electrode 16 into contact with theelectrode 11. As the crank passes the center and the pistontis ready trip frees itself from the rocker and the spring 22 retracts the-electrode 16, thus breaking the circuit and producing the ignit i ug-spark inlzhe combustion-chamber.

The cushion-spring 23 is to cushion the contact between the electrodes 11 and 16. As the operation of the rocker is )ositive, it would be diiiicult to effect just the desired pressure of one electrode on the other to al- I second electrode by securing one termi- The means employed for closing the cir-.

operating-arm 2 which combustionways insurea contact and yet avoid injury to the parts, and therefore a cushion is interposed between the rocker-arm and the electrode 16. i

Fig 4 shows a construction of the head of the electrode 16, wherein the nut 20. forming the limiting-stop for the electrodes, screws directly into said head, the nipple omitted.

There is a suitable limiting-stop 32 back of the rocker-arm, Fig. 2, to arrest the backward movement of electrode 16 is retracted. 'Any form of stop device may be employed for this purpose.

The electrodes 11 and 16 are terminals of the electric circuit, one being fixed and the other movable to make and break the circuit of which they form a part. I which need not be very considerable in extent, is preferably produced by a longitudinal sliding movement of the electrode 16, but this movement may be attained in any way.

Having thus described my invention, I claim- 1. An internal-combustion engine, having an electrical igniting device comprisin an electric circuit including a generator, a fixed electrode of the circuit, which extends into the c0mbustion-chamber of the engine, and I a movable electrode of the circuit which also I extends into the said chamber and may be I I I moved into and out of contact with the fixed electrode, a spring which breaks the contact between the electrodes, a stop which limits the outward movement of the movable elec trode, and means for moving the said electrode into contact for closing the circuit, said means consisting of the cam-shaft 3, the eccentric 28 thereon, the eccentric-rod 27 and its yoke, the link 30, to which said rod is pivoted, the trip 26 on said rod, the rocker 23, having an operating-arm in position to be engaged by said trip, anarm" 25.,and a cushion-spring 23 so dis osed as to impinge on the said movable e ectrode. l

2. In an internal-combustion engine having a combustion chamber, the combination with an. electrode extending within said chamber, a bushing in a wall of said chamber, a nut at the outer end of said bushing, a I second electrode passing through said bushl ing and nut, saidsecond electrode having a I shoulder located between said nut and the combustion-chan1ber and ada ted to bear against said nut, and means fhr intermit- 3. In an internal-combustion engine hav ing a combustion-chamber, the combination I with an electrode extending Within said chamber, a bushing in a wall of said chamher having a housing-cup at its outer end, a nut also at the outenend of said bushing, a

19 being the rocker-arm when the The movement, 4

I tently bringing the said electrodes into contact.

$49,769 is v ing and 'nufi, said secqnd lectrbde' hairil'igh I witnesswheteof I have hereunto signed shouldeii adaptedto-bear again'sbthainside of I my-mm this 10th day of August; 1904, in said nut, a second hQusing-cup siituegit'o the the" preseiiqgoftwo subscribing witnesses.

OIitBLGD d-Qf said'sfggiond eleotroglqaflprin I FRANCIS W. BRADY. 5 interposed betweii isaidhousing-cups an ..}:Witns'sej$: xz neans for intermittently moving said second YHENRY CONNE'IT, 1 electrode inwardly. BENJAMIN H.'HOLT.

Images