Патент USA US2404658код для вставки
' July 23, 1946‘. A. w. ROBINSON, JR" , 2,404,658 IGNITION SPARK GAP DEVICE ‘ Filed April e, 1945 ‘ nven'bor: by A ' urWRobinsonJr, 1) His Attorney Patented July 23,1946 2,404,658 ,UNITED STATES PATENT OFFICE IGNITION SPARK GAP DEVICE Arthur W. Robinson, Jr., Schenectady, N. Y., as signor to General Electric Company, a vcorpo ration of New York Application April 6, 1943, Serial No. 482,036 1 Claim. (Cl. 250--27.5) My invention relates to spark gap devices such as are used in connection with ignition systems for internal combustion engines. An object of my invention is to provide an improved ignition spark gap device. , V ‘ Another object of my invention is to provide an improved quenched spark gap device in which the spacing between the discharge electrodes and 2 . extends from substantially the outer periphery of the electrodes to ‘a short distance beyond the outer edges of the grooves I4, and the two elec trodes and the spacing element iii are held in the desired relative axial relationship by an an nular insulating spacer I'I arranged about the outer periphery of these elements. ‘An enclos ing casing is formed about the discharge elec the pressure of the gas in the device provide for trodes and includes a substantially cup-shaped an electrical breakdown discharge at substan-, in casing member I8 arranged about the spacer ll tially a predetermined voltage. and each respective electrode. Each electrode Further objects and advantages of my inven is electrically connected and is secured to its re tion will become apparent and my invention will spective casing I8 by being welded thereto at I9. be better understood from the following descrip This welded connection is made by forming the tion referring to the accompanying drawing, and 15 outer edge 20 of each electrode with a relatively the features of novelty which characterize my small projection 2| which is arranged in engage invention will be pointed out with particularity ment with the inner surface of the casing I8. in the claim annexed to and forming part of In assembling the electrode in the casing, a weld~ this speci?cation. ing terminal is connected to the electrode I0 and 20 In the drawing, Fig, 1 is an elevational view, another welding terminal is connected to the partly broken away, illustrating an embodiment outside of easing I8, such that welding current of my invention; Fig. 2 is a plan view, partly passes therebetween through the projection 2|, broken away along line 2-—2 of Fig. 1; and Fig. 3 so as to heat this projection. Pressure is applied is a fragmentary sectional view of a part of a to the casing I8 and the electrode I0 so as to pro discharge electrode and its enclosing casing prior 25 vide a suitable weld between the ?ange 20 of the to the ?nal step of assembly of an electrode in electrode and the casing I8, as shown at III in its casing. Fig. 1. A pair of electrodes and casings then is Referring to the drawing, I have shown a quenched spark gap device adapted to be used assembled with a spacer element I6 between the outer portion of adjacent faces thereof to space in an ignition system which includes a pair of 30 apart these faces substantially a predetermined spaced apart electrodes having main body por distance and with a spacer I'I arranged between tions I0 and II each formed with an annular the discharge electrode and the casing I8. Pres groove I2 in one of the faces thereof. This forms sure is then applied to the outer side of the cas a central discharge portion l3 on each electrode, ings I8 to hold these casings in position and and a discharge face Id of suitable relatively hard 35 biases them towards each other and to bias the electrically conductive material, such as tungsten, electrodes toward the intermediate insulating silver, or carbon, is fused, plated, or otherwise spacer element I6. The adjacent edges of these suitably secured to the central discharge portion casings are then hermetically sealed together by I3. In order to obtain an accurate spacing-be a suitable insulating seal formed of an annular 40 tween adjacent discharge faces, the discharge glass element 22 fused about the outer edges 23 electrode is formed by suitably grinding or other of the casings. Due to manufacturing tolerances, wise ?nishing the outer plane surface of the it is substantially impossible to obtain a uni discharge face I4 and the outer plane surface formly satisfactory predetermined spacing be of a supporting ?ange I5 formed on the outer 45 tween the discharge faces I 4 in such an assembly. side of the groove I2, such that these outer sur It is desirable, therefore, that this spacing be faces both lie in the same plane. The desired made as accurately as possible and that the pres~ predetermined spacing between the discharge sure of the gas within the spark gap device be faces I4 is obtained by arranging two discharge regulated such that the discharge between the electrodes with the faces I4 thereof adjacent each faces I4 will take place at a substantially prede other and spaced apart by an annular insulat termined voltage. It is also desirable that a sub ing element of substantially predetermined thick stantially pure and inert gas be used to ?ll the ness arranged intermediate the faces of the space within the spark gap device in order to ?anges I5. This insulating spacing element I6 is minimize pitting of the discharge faces. This is formed of a suitable material, such as mica, and 55 obtained by evacuating the device through an 2,404,658 A quenched spark gap device including apair opening 24 formed in one of the casings I8 and V of spaced apart electrodes each having an an ?lling the device with a suitable gas, such as hy drogen, neon, or argon, then evacuating the de vice a second time and re?lling it with the same nular groove in the face thereof adjacent the other electrode, an intermediate insulating ele ment of substantially predetermined thickness gas. The opening 24 then is hermetically sealed in any suitable manner, as by welding at 25, to insure against the exchange of gas between the surrounding atmosphere and the inside of the discharge device. The pressure of the gas in the device is regulated such that with the spac between adjacent faces of said electrodes ex tending from substantiallythe outer periphery of said electrodes to said grooves forming central discharge portions, a, discharge face of relatively 10 hard electrically conductive material on said dis charge portions, an insulating spacer about the ing between the discharge faces, electrical dis ' outer periphery of said electrodes, a cup-shaped charge breakdown occurs between the discharge enclosing casing about said insulating spacer and each of said electrodes, each of said casings be ternating current voltage or any other suitable predetermined voltage. In this manner, a uni 15 ing welded to its respective electrode providing an electrical connection therebetween; means in-' form breakdown voltage is assured irrespective cluding an annular gas-tight glass seal about the of variations in the manufacturing tolerances of ' adjacent ends of said cup-shaped casings for the different elements used in each spark dis faces between 1175 and 1225 peak volts of an al- N charge device. substantially hermetically sealing said device with _ 20 said casings insulated from each other and for While I have illustrated and described a par holding said casings biased toward each other to ticular embodiment of my invention, modi?ca maintain said electrodes biased toward said in tions thereof will occur to those skilled in the termediate insulating element, and hydrogen gas art. I desire it to be understood, therefore, that in said device at a pressure such that electrical my invention is not to be limited to the particular 25 discharge breakdown between said discharge faces arrangement disclosed, and I intend in the ap at the spacing therebetween occurs at between pended claim to cover all modi?cations which do 1175 and .1225 peak volts of an alternating cur not depart from the spirit and scope of my in rent voltage. vention. ' What I claim as new and desire to secure by 30 Letters Patent of the United States is: ' ' V ‘ ARTHUR W. ROBINSON, JR.