Патент USA US2134053код для вставки
-Oct. 25‘, 1938. A. A. LINSIELL 7 2,134,053. ENGIHE IGNITION SYSTEM Filed May 11, 1955 _ 77 ‘ l IIIIIII 7 ‘ I' INVENTOR ALf‘RED A. SELL v ATTORNEY Patented Oct. 25, 1938 2,134,053 UNITED STATES PATENT OFFIQE ' 2,134,053 ENGINE IGNITION SYSTEM Alfred Aubyn Linsell, Sydcnham, London, Eng land, assignor to Radio Corporation of Ameri ca, a corporation of Delaware . Application May 11, 1935, Serial No. 20,900 In Great Britain June 2'7, 1934 1 Claim. (01. 123—-179) This invention relates to ignition systems for internal combustion engines and more particu larly to ignition systems of the kind incorporating one or more series resistances in the sparking plug '5 lead or leads for reducing or eliminating inter ference which would otherwise be caused by the ignition system with nearby radio apparatus. As is well known radio receiving apparatus is likely to be subjected to considerable interference if situated too near the ignition system of an internal combustion engine and this difficulty becomes very serious in some cases, notably where radio receivers are ?tted to motor cars or upon The invention is illustrated in the accompany There are many known expedients whereby interference by an internal combustion engine ignition system with nearby radio apparatus may carrying out this invention, there is provided a systems, resort is made to the use of “suppressor” the leads to the sparking plugs, there being usu ally a resistance placed in series in each lead and as near as possible to each plug. It has been found that known systems of this kind have the disadvantage that the series resistances, if of suilicient value to be eifective, tend to make the internal combustion engine di?icult to start, and the object of the present invention is to obviate this di?lculty. - According to this invention in its broadest as pect, an ignition system of the kind wherein in terference with nearby radio apparatus is reduced or eliminated by means including one or more “suppressor” resistances is characterized by the provision of means for short circuiting said re sistance or resistances so that when the engine is to be started up the said resistance or resist ances may be short circuited, but when the engine is running the short circuit or circuits may be , 4.0 e. g. on one or both sides of the ignition dis ,trib-utor. ing diagrammatic drawing. 20 resistances, for example, resistances in series in '30 tion systems embodying “suppressor” resistances in series in ignition leads and adjacent sparking plugs. It is to be understood, however, that the application of the invention is not limited to such ignition system for it may be applied to short circuit (when starting) suppressor resist ances placed elsewhere in an ignition system‘ 10 aeroplanes. be reduced or eliminated and in a number of 25 simultaneous operation with an electric starter. The invention- will now be particularly de scribed with reference to- its application to igni removed. suppressor resistance 3 and thermostat switch unit in connection with each spark plug I. The resistance which is diagrammatically represented by a zigzag line is carried upon a former or car 20 rier C which has a terminal T at one end and is adapted at the other to ?t over a sparking plug stem, the terminal being connected to the upper end of the resistance and the sparking plug terminal 20 being connected by lead C to the other end of the resistance. Also connected as by lead 2| to the end of the resistance adjacent T and also carried by the former or carrier is a contact 4 adapted to co-operate with another contact 5 carried upon a bi-metallic strip 2 which 30 is arranged parallel to the said former C and. is of about the same length. The bi-metallic strip (like the former or carrier 0) is provided at the end remote from the contacts with an aperture adapted to be passed over the stem of a spark plug, the Whole arrangement being such that the resistance and bi-metallic strip unit may be clamped in position upon the sparking plug stem, as shown, by the ordinary screw terminal 22 thereof. In one preferred class of~arrangement in ac cordance with this invention the short circuit ing means is or are automatically operated so that the short circuit or circuits is or are re moved automatically when the engine is run ning. Referring to Figure 1 which shows one way of . . _ In another preferred class of arrangement in accordance with this invention, said short cir cuit means is or are interlocked with a device '50 which is operated for starting the engine so that performing of an operation necessary for start ing the engine is accompanied by a short circuit ing of the resistance or resistances. Fig. 1 shows the invention as applied to a plug, 55 Figs. 2 and 3 show the invention adapted for 40 The ignition or high tension lead 23 is con nected, not to the sparking plug terminal but to the terminal T. The bi-metallic strip is so constructed that at normal atmospheric temperatures the two con tacts 4, 5, touch and the resistance is accord ingly short circuited. When, however, the engine has been running a suf?cient time the rise in temperature will cause the bi-metallic strip 2 to bend, the contacts .4, 5, will open and the short circuit across the resistance 3 will be removed. In another way of carrying out this invention illustrated in Fig, 2 switches each having con tacts adapted to short circuit a resistance 3 in series in the ignition lead to a plug of an internal 55 2.. I relay circuit for controlling the energization of sented at SC. Alternatively the operating rod or wire ‘I may be arranged to be actuated by a bi metallic or other thermostatic device which may be specially provided for the purpose, the device being arranged to hold the resistances short cir the starting motor of the engine. The arrange ment is such that whenever the circuit of the starting motor is closed or whenever a relay cir cuit for the starting motor is closed, the switches are operated to short circuit the resistances, the operated by engine heat so that it removes the short circuits when the engine is warm. Where an embodiment of this kind is applied to an auto mobile which is already equipped with a thermo 10 ’ combustion engine, are arranged to be operated electro-magnetically by electro-magnets EM either as shown by current ?owing through a starting motor SM for the engine or through a short circuits being, of course, automatically re moved when the starting motor or the control circuit therefor is opened. In Fig, '2 which illus trates the case where the starter motor current 15 operates the switches the starter button is shown as the usual spring biassed button ll‘ having starting contacts SC and the starter battery is marked P. Only one of the suppressor resist ances and the associated short circuiting switches 20 is illustrated in Fig. 2 only the magnets EM of the others being shown and the‘ operating members SW of the switches. The switches and resistances may, however, be arranged much as shown in Fig. 3 (to be described) in which case the members SW of Fig. 2 might be the same as the members S of Fig. 3. In a modi?cation of the last described arrange ment (also not illustrated) instead of employ ing electroinagnetically operated switch means, 30 there is employed mechanically operated switch means mechanically interlocked with the starter switch or button. 7 , Where, the usual case, there is a plurality of sparking plugs each with its own series resistance, it is convenient to arrange for these resistances to be short circuited by a common control mem ber. For example as shown in Fig. 3 each re sistance 3 may be arranged upon a former or carrier C which also carries a contact 4 and is 40 associated with a ?at metal spring S having a co-operating contact 5 the arrangement ‘of the former C, resistance 3, spring S, and contacts 4, 5, being generally similar to the arrangement of former C, resistance 3, bi-metallic strip 2, r and contacts 4, 5, in Fig. l and such that when contacts 4, 5, are closed against the bias of the associated spring S the appropriate resistance 3 is short circuited by the said metal spring. The former-resistance-spring units have terminals T for connection of ignition leads and are arranged to be ?tted over and clamped upon the sparking plug stems much as in Fig. 1. Preferably the arrangement is as shown in Fig. 3 so that the springs S project vertically upwards from the plugs l. The springs S are continued beyond the contacts 4, 5, and formers C and have apertures or slots through which pass a control wire or rod ‘I this control wire or rod passing successively through all the springs of all the units and being 60 arranged when pulled in the direction of the cuited so long as the engine is cold but to be static device for operating louvres or ventilators in connection with the cooling water system of the engine or for operating a ba?ie valve in con nection with said cooling water the same thermo static device may be employed for operating the 15 short circuiting switch or switches. Again in a further modi?cation (not illustrated) the con trol rod or wire is operated by an electro-magnet energized either under the control of a “ther mometer switch” (i. e., a temperature operated 20 switch) associated with thecooling water of the engine, or in dependence upon current ?owing through the starter motor or a relay circuit there for so that when the motor circuit or the relay circuit therefor is energized the resistances are short circuited but are in circuit at other times. Instead of employing an electro-magnet to con trol the short circuits mechanically by means of an operating rod or wire, the control may be elec trical i, e., the operating rod or wire may be 30 dispensed with and each spring adapted to serve as the armature of a separate operating electro magnet, all these operating electro-magnets hav ing their windings in series with a source of po tential P and the contacts of an electro-magnetic switch whose energization may be controlled in any of the ways just described in connection with an electro-magnet for actuating an oper ating rod or wire . , > An important practical advantage of the in be achieved, because, of course, the difficulty that ‘large resistances interfere with the starting up 45 of the engine is obviated by the said invention. Having now particularly described and ascer tained the nature of my invention and in what manner the same is to be performed, what I claim as novel and desire to secure by Letters Pat ent is: In an electric ignition system for an engine provided with a starting switch and having a plu rality of spark plugs, the combination of a re sistor connected electrically in series with and 55 extending upwardly from the top of each of said plugs, a conducting spring member connected to the lower end of each of said resistors and nor mally disengaged from the upper end, a hori~ zontally disposed slide rod connected to the upper 60 arrow to cause each spring S to short circuit ends of said conducting spring members, each portion of the slide rod that is connected to the is controlled by a master lever 9 which may be in terlocked with or even constituted by a starter switch (usually a spring biassed press button, and shown as such at H in Fig. 2) so that when 70 the starter switch is operated the resistances 3 are short circuited. As shown the lever 9 is pivot ed at Ill and the starter switch contacts are repre 50 ' its associated resistance 3. The operating rod or wire ‘I should, of course, include insulating por tions 8 so that it cannot short circuit one spark 65 ing plug to another. The operating rod or wire 1 40 vention is that it enables large resistances to be 'used for radio interference suppression and there fore enables e?icient interference suppression to spring member being electrically insulated from the other such portionsof the slide rod, and me chanical linkage between the starting switch and 65 the slide rod whereby upon actuation of the starting switch the slide rod is moved to urge the normally disengagedends of the conducting ‘ members into contact relation with the associ ated ends of the resistors whereby said resistors 70 are momentarily short circuited. ALFRED AUBYN LINSELL.