US1191603A - Spark-plug for internal-combustion engines. - Google Patents

Description

R. D. LOOSE.

SPARK PLUG FOR INTERNAL COMBUSTION ENGINES. APPLICATION FILED JAN. I8, I915.

1,191,603. PatentedJuly18,I916.

ROBERT 'D. LOOSE, FORT WORTH, TEXAS.

SPARK-I'LUG non INTERNAL-COMBUSTION Enemies.

pq en l Patented July is}, 1916.

Application filed January 18, 1915. semi noiasss.

' Spark-Plugs for Internal-Combustion Entheir length. This and other objects and gines; and I dojhereby declarethat the following description of my said invention, taken in connection with the accompanying sheet of drawings, forms a full, clear, and exact specification, which will enable others skilled in the art to which itappertains to make and "use the same. 1

My invention relates to improvements in electric ignition devices, and primarily to spark plugs utilized as a part of the modern electrical system of an. internal 1 sulatedflplectrodef or 'electrodes'attached to and prQ ectmg from the bushing 1, to which combustion or gasolene motor. I v The object of my invention is the produc-v tion of a spark-plug having insulated and noninsulated electrodes within'the cy'linder or cylinders of an engine of the class described, between which electrodes there is a varying degree of separation, so that an induced electrical spark, irrespective of magnitude, will traverse the space or gap between said electrodes at some point of advantages I accomplish by the means hereinafter fully described and as particularly pointed out in the claims.

In the drawings which serve to illustrate my mid invention more fully, Figure 1 is a side elevation of a spark plug constructed in accordance with, my invention. Fig. 2 isa fragmental side View of a spark plug .provided with a single pair of my improved electrodes. Fig. 3 is an inner end view of the form shown in Fig. 2. Fig. 4 is a view similar to Fig. 2 illustrating a somewhat diflerently shaped grounded electrode. Fig. 5 is van lnner end viewof the form shown in Fig. 4. Fig. 6 is an inner .end view of a spark plug provided with three equi-distant grounded electrodes. F g. 7 is an inner end view of a spark lug provided with four characters or symbols of reference in all the figures of the drawings.

In Fig. l, I illustrate a conventional type of spark plug having a hollow metal bushing 1 threaded on its lower or inner end por- .trode 8.

site side of-electrode 8 and likewise non-- tion 2- for. engagement in corresponding screw threads in the opening in the-motor cylinder and provided with ,a hexagonal 'or similarly shaped head 3, adapted to be an gripped by a turning wrench, an insulator 4 of porcelain, micaor other suitable material,

a threaded gland 5 .for suitably clamping the insulator within the bushing, a spindle 6 extendingcentrally longitudinally through the bushing and I having its outer project- 1ng end provided with'a terminal 7 to which the bushing of thespark plug and forms the insulated electrodeflof the device.

It 1s, however, tothe grounded or. non-inmy invention is particularly directed, and in one of the exemphfications thereof: viz, Fig.

1,oneof the said nonainsulated or grounded electrodes consists of a depending, inwardly curved member 9, havin its upper end aflixed to the lower face 0 the bushing and its lower end rebent to produce .a reentrant member 10, which member extends upwardly but dive'r ingly from the insulated elecocated preferably on the oppoinsulated, and attached to the lower face of thebushing 1, I-provide an electrode 11 comprlsmg a depending member 11*, possessed of a horizontal portion 12, extending inwardly and closely to the electrode 8,

which portion 12 is then downwardly bent and diverginglyspread relative to said electrode 8, forming a diverging member 13,

tively, are arranged in parallelism toeach' other and likewise in the same vertical plane asthe electrode 8, Fig. 8, yet the lower por- I tion of the member 10 and the upper end of member 13, respectively, are located nearest the said electrode 8, whereby in the case of a spark induced by a weak source of electrical energy, the said spark will bridge the nearest distances, between the electrodes 8, 9, and 11, respectively, at the lower end of memb'ers 8 and 10 and medially of 8 and the upper portion of 13, producing two sparks as it were, and thereby increasing the efiiciency of the spark plug; and, it is to be are (59 Lei observed that as the source of electrical. energy becomes higher powered, as for instance in the speeding up of a magneto due to the operation of the motor already re ferred to, the induced sparks will increase in strength, and breadth until. the members 13, 8, and 10 may be substantially enveloped thereby.

I now desire it understood that l do not confine myself to one pair of oppositely dis= posed electrodes 9 and 11, as for instance, in Figs. 6 and 7, I illustrate a plurality thereof disposed concentrically about the insulated electrode 8.

In Figs. 2, 3, 4:, and 5, I show electrodes of various shapes in cross section, any of which may be employed without change or modification.

While herein 1 have disclosed the preferred mode of practising'my invention, i may make such changes and alterations therein as may occur to one skilled in the art, or permitted under the doctrine of equivalents.

Having thus fully described my invention ll claim as new and desire to secure to myself by Letters Patent of the United States V 1. An article of the class described including a body and a member insulated therefrom, passing through said body and therebeyond, a member, non-insulated and depending from said body, and divergingly arranged with respect to said insulated member, and another member non-insulated and-likewise depending from said body and convergingly arranged with respect tosaid insulated member,

2. An article of the class described includ ing a body and a member insulated therefrom, passing through said body andv therebeyond, a member non-insulated and depending from said body, and divergingly arranged with respect to said insulated memher, and another member non-insulated and likewise depending from said body and convergingly arranged with respect to said insulated member, said non-insulated members being disposed in parallelism to each other.

3.. An article of the class described including a body and a memberinsulated therefrom, passing through said body and therebeyond, a member non-insulated and depending from said body, and divergingly arranged with respect to said insulated member, and another member non-insulated and likewise depending from said body and eonvergingly arranged with respect to said insulated member, said non-insulated memhere being disposed in parallelism to each other, and in adjacency to said insulated 7 member,

. are

4e An article of the class described including a body and a member insulated therefrom and passing through said body and there-below, a pair of depending members non-insulated from and depending from trodeextending radially toward said axial electrode to close adjacency therewith and terminating in a sharp corner, and an extension of said electrode extending divergingly from said axial electrode, thereby pro ducing a spark gap of gradually increasing length between said electrodes.

6. A spark. plug including a body, an electrode extending axially through and beyond said body, said electrode being insulated from said body, a second electrode depending from said body, near the margin thereof, and non-insulated therefrom, said second electrode extending radially toward said axial electrode to close adjacency therewith and terminating in a sharp corner, and an.

integral extension of said second electrode extending from said electrode at said corner downwardly and divergingly from said axial electrode, thereby producing a spark gap of gradually increasing length between said electrodes, all of said electrodes being lo cated in the same plane.

7. A spark plug including a body, an electrode extending axially through an exteriorly of said body, said electrode being insulated from said body, a second electrode depending from said body, near the margin thereof, and non-insulated therefrom, said second electrode extending radially toward said axial electrode, intermediate the length of the exterior portion thereof, and to close adjacency therewith, and terminating in a sharp corner, and an integral extension of said second electrode extending from said electrode at said corner and extending down: wardly and divergmgly from said axial electrode, thereby producing a spar of gradually increasing width between said electrodes, all of said electrodes being located in the same plane.

in testimony whereof I have hereunto set niy hand in the presence of twosubscribing witnesses.

RGBERT D. LUUEiE.

In the presence of dorm FREELAND,

W Srnwnnr.

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