Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.


  1. Advanced Patent Search
Publication numberUS995400 A
Publication typeGrant
Publication dateJun 13, 1911
Filing dateOct 13, 1910
Priority dateOct 13, 1910
Publication numberUS 995400 A, US 995400A, US-A-995400, US995400 A, US995400A
InventorsJohn F Cavanagh
Original AssigneeLindsley And Allen Electric Company, John F Cavanagh
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Ignition device.
US 995400 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)


Patented June 13, 1911.

.wm ramm B11 [22 a, aw

the end of the core. Figs. 5 and 6 are To all whom it may concern:



Be it known that I, JOHN F. OAVANAGH, a citizen of the 'United States, residing at the city of Providence, in the county of Providence and State of Rhode Island, have invented certain new and useful Improvements in Ignition Devices, of which the following is a specification, reference being had therein to the accompanying drawing.

This invention relates to spark coil mechanism and easing that is especially adapted for use in connection with spark plugs of gas engines.

When the spark coiloand the plug are located in eparate places as is customary, and connected by a high tension 'wire, there is liable to be some loss of energy, and moreover the/said wire may become loosened or injured. i

One of the objects of the present'invention is toprovide'an improved structure whereby the usual high tension connecting wire is dispensed with.

Another object is to. provide a device of this character which can be used in connection with any standard spark plug, and which may be quickly removed from one spark plug to another, or different coil mechanisms substituted one for another in connection with any given spark plug.

Another object of the invention isto provide an improved form of condenser which will retain its shape and place in the coil casing.

To these ends theiinvention' consists in th construction and combination of parts substantially as hereinafter descrlbe'd and claimed.

Of the accompanying drawings: Figure a perspective view of my improved device mounted in position on an engine. Fig. 2 represents a horizontal section of the device shown in Fig. 1. Fig. 3' represents a section-on line 3'3 of Fig. 2. Fig. 4 is a perspective view of thecap plate at views similar to a portion of Fig. 3 but illustrating slight modifications hereinafter described. Fig. 7 is a perspective View of the adjusting screw ,and its retaining device. Fig. 8- is a detail illustrating the means for holding the adjusting screw.


Specification of Letters Patent. Patented J 1111913, 1911, f Application filed October 13; 1910.v Serial No. 586,894.

Similar reference characters indicate the same or similar parts in. all of'the views.

A portion of an enginecylinder is indi-} cated at 16 in Fig.1, a standard sparkplug being indicated as a whole as at 17. It is understood of course that all spark plugs are screwed tightly in position to avoid leakage. I have provided a structure of coil and coil casing so that-the spark plug itself can be utilized as the sole means of holding the coil in proper position relatively to the spark plug, an especial advantage of this being that I am enabled to dispense with the usual high tension con-. necting wire. a Referring first to Figs. 1, 2, 3 and 4, I

provide a cylindrical casing 18 having an integral projection 19 at one side, this casingas a whole being formed of an insulating.

compound which is molded under heavy pressure. As shown in Fig. 2, one end of the cylinder 18 is closed by a disk 20 of material similar to that composing the rest of the casing, said disk being sealed in place after the internal mechanism has been placed in the cylinder. The other end of the cylinder 18 has an opening in which is secured a cap 21 (see Fig. 4), said cap having a centralportion pressed out to form a recess 22 in its inner wall, for the purpose of receiving-and supporting the end of the core, thus enabling the primary winding. to be carried very close to the end of the core, contrary to the usual 490,721, filed April 19, 1909. This structure.

includes two concentric soft metal rings 24,

25 embedded in the material of the casing.

26 is screwed to the outer ring 24-.

A cap I A vibrator disk 27 is mounted on the inner ring 25, said disk 27 carrying the armature 28 opposite the central portion of the cap' 21. An adjusting screw 29 serves to control the fiow of current in the usual manner..

In the present case, to hold this screw in its adjusted position, 'I' provide it with a 'flange 30 having a spring tongue 31 adapted to enter either one of a plurality of notches 5 construction, by which construction the 32 formed in the periphery of a boss 3;; off the cap 20.

The coil comprising the usual core 34-. primary winding35 and secondary winding 36, is mounted in the cylinder 125 with the end of the core fitting the recess 22 oi". cap 21. In Fig.2 I omitted representation of the usual Wax filling surrounding the coil in order to avoid confusion in said figure.

Heretofore it has usually been customary to run the condenser leads outside of the Winding in which position it Was diiiicult to insulate from the secondary Winding and made the device more bulky. As best shoWn by comparing igs. 2, 3, the wrapping of the bunch of Wires comprising the core 111- cludes also two leads 3'? which are therefore in such position that they are always protected, and are located out of proximity to the secondary Winding 36.

The primary coil at one end is connected. to a terminal (see Fig. 3) and the ring 24L has a connection with a terminal ll, and the secondary Winding is connected by a lead 42 extending through the body of the casing to the bottom of a socket 4.3 formed in the side projection 19. l his lead 4-2 at its inner end may be so formed that it Will itself connect With the tip of the spark plug but further projection may be made for better contact with the spark plu As shown in Fig. 3 a shell 44 may be molded into the bottom of the socket 4.3, said shell having the lead 42 extending directly to it. This shell extends far enough away from the end of the socket to embrace a cap 4E2 attached to the upper end of the spark plug 17. As shown in Fig. 5 the connection from lead 42 to the spark plug may be by means of a spring 45 coiled in the bottom. of the socket 43. In Fig. 6 It shoW the same form of shell 44: as in Fig. 3, but the Wall of the plug r ceiving socket is, in this case, provided With a lining d6 of high heat resisting material. lfn each Figs. 3, 5 and 6 ll show rein forcing shell l"! for the mouth or entrance end the plug socket.

It will now be understood. that the device as shown Figs. 1. 2 and 3 may be readily slipped upon the spark-ping so as to he supported thereby,- and may be as conveniently noved from the sparir plug. The fact i the spark receiving socket is med with a p ejection one side oi the and at substantial right an- Y gially midway Without undue gines have the spark plug projecting lat? casing 16. this case it is desirable to so couple the igniting device to the spark plug that it cannot be jarred loose therefrom. As shown in Fig. 6 the rein force 1-? is polygonal in form so as to fit the usuai Wrench engaging portion of the standardspark plug so that the igniter cannot rotate on the spark plug. The reason Why the aperture or opening in the coupling is polygonal is so that it can he slipped over the spark plug in order to get it to a position below or past the Wrench engaging faces of the spark plug. Since the coupling has flanges which engage below the said. Wrench engaging faces, and a curved Wall Which is clamped upon the igniter casing, the said igniter cannot become jarred. loose from the spark plug; this also serves to radiate heat from the socket.

As shown in Fig. l the side of the cylindrical portion 18 of the casin is formed with an elongated flat face Which fiat face extends out over the upper end of the projection 19. This Wide fiat area is purposely provided to afford a surface which may bear instructions for the attachment and use of the igniter and a diagram to aid in the same.

The operation of the timer is of course as usual. and need not be described herein.

1 claim:

1. in an ignition device, a coil-carrying casing having a contact carrying socket for readily receiving and completing the circuit through a spark plug, the axis of said socket being in a difiierent plane from that of the coil casing, and a contact adapted to complete a circuit With a spark plug.

2. an ignition device, coil-carrying casing having an integral projection at one side, said projection having a socket to receive aspark plug, the lon 'itudinal axes of the coil-carrying portion or the casing and 0; the socket being substantially at right angle to each. other.

3. in an ignition device coil-carrying casing having an integral projection one side, said projection havin "a soc ceive a spark plug, the lon the coil-carrying portion of of the socke being substant' angle to cab other and in c casing having a socket for a spark plug, the

one side thereof all being formed of: pressed said socket carrying a contact to complete 10 and integral material, a socket being formed a circuit with the spark plug.

in said projection to receive a spark plug. In testimony whereof I aflix my signa- 6. In an ignition device, a coil-carrying ture in presence of two witnesses.

Walls of said socket being composed of a JOHN OAVANAUH' high heat insulatingmaterial the remaining Witnesses:

portion of said casing being constructed of HOWARD E. BARLow,

a comparatively low heat resisting material, E. I. OGDEN.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2447376 *May 28, 1943Aug 17, 1948Bendix Aviat CorpIgnition apparatus
US2461293 *Jun 21, 1943Feb 8, 1949Miller Raymond JIgnition circuit
US3716038 *Mar 31, 1971Feb 13, 1973Motorola IncHigh voltage coil boot
US3935852 *May 20, 1974Feb 3, 1976R. E. Phelon Company, Inc.Spark plug connector and ignition coil module for engine ignition system
US4300111 *Mar 7, 1979Nov 10, 1981Johansson Sven HDevice in ignition coils
US4514712 *Apr 7, 1978Apr 30, 1985Mcdougal John AIgnition coil
US4517540 *Mar 28, 1980May 14, 1985Mcdougal John ASpiral windings
US4706639 *Dec 4, 1986Nov 17, 1987General Motors CorporationIntegrated direct ignition module
US4989575 *Dec 2, 1988Feb 5, 1991Sanshin Kogyo Kabushiki KaishaIgnition device for internal combustion engine
US5291872 *Jul 2, 1992Mar 8, 1994MotorolaIgnition apparatus for an internal combustion engine
Cooperative ClassificationH01F38/12