US1417766A - Externally-heatable ignition plug - Google Patents

Description

A. PETER. EXTERNALLY HEATABLE IGNITION PLUG.

APPLICATION FILED JUNE 1. I920.

Patented May 30, 1922.

UNITED. srA-ras rareur OFFICEQ ALFRED PETER, OF BEIAOIT, WISCONSIN, ASSIGNOR TO FAIRBANKS, MORSE &'CO., OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

EXTERNALL Y -I- IEATABLE IGNITION PLUG.

Application filed June 1,

To all whom it may concern:

I Be it known that I, ALFRED ln'rnn, a citizen of the United States, residing at Beloit, in the county of Rock and State of Wisconsin, have invented a certain new and useful Improvement in Externally-Heatable Ignition Plugs, of which the following is a specification.

This invention relates to ignition plugs for internal combustion engines of the class such as a kerosene oil engine, which requires an external heating device at starting, but thereafter fires itself. An engine of this type is shown in Hobart & Jahnke Patent No. 1,159,341, issued November 2, 1915.

The object of this invention is to provide a device of this character carrying an externally heatable electric resistance coil which is so simply constructed as to be readily insertable and removable in the wall of the engine and in which the plug itself can be quickly taken apart for replacement of one or more parts, particularly the resistance or heating coil. 7

The invention consists in means for carrying out the foregoing objects which can be easily and cheaply made and installed, which is satisfactory in use and is not readily liable to get out of order. More particularly the invention consists in features and details of construction more fully set forth in the specification and claims.

Referring tothe drawings in which simi lar numerals represent the same parts throughout the several views,

Figure'l is a sectional detail view of the mechanism illustrating this invention in its preferred form as it appears applied to the top horizontal wall of an engine cylinder.

Figure 2 is a plan view of the plug itself as seen in Figure 1, the electric circuit at the top of that figure being omitted.

As shown in the drawing, the plug body 16 is applied through the agency of screw threads 10, to an engine wall 12, shown in conventional form, provided with a water jacket space 14. The portion of the plug body 16 which remains outside the engine wall is provided with a non-circular, in the particular case here illustrated hexagonal, circumferential wall 18 adapted to be engaged by an ordinary wrench for obvious purposes.

Extending through this plug 16 is'a cylindrical member 20 carrying at its smaller end Specification of Letters Patent.

Patented May '30, 1922. 1920. Serial No. 385,595.

screw threads 22 and having on its other end an enlargement or shouldered head 24 which takes bearing on insulating washers 26 through which the smaller portion of the screw passes. The member 20-24 will for convenience be referred to as a core. The end of member 16 which is toward the inside of the engine is bored outin a relatively large recess 28 against whose inner end, here.- after referred to as shoulder 25, the washer 26 takes bearing. This recess 28 is of sufficient size so that it provides an insulating air space all around the head member 24 of the core, heretofore referred to. The remainder of the central portion of block 16 not occupied by recess 28 is occupied by a continuing, but smaller, perforation 29 of such a size that it provides an insulating airspace around the smaller portion 20 of the core. Slidahlv mounted on the outer end of this member 20 and closing the open outer end of recess 29 is an insulating washer 30 over which is placed an ordinary metal washer 32 held in place by a nut 34 traveling on screw threads 22 on member 20 in the ordinary manner.

From the foregoing it will be seen that nut 34 detachably fastens the core member 26-24 inside of the plug body 16 in insulated relation therewith. The portion 20 of the core is made of sufficient length so that it extends considerably beyond the outer end of plug body 16, above it as shown, where it is engaged at its outer end by a clamping nut 36 provided at its outer end with means for connecting it in an electric circuit in eluding a battery 38. In the particular case here illustrated, the wire 40 leading from the battery is attached to metallic plate 42 which is secured to the end' of nut 36 by an ordinary screw 44 in the obvious manner.

The-effective engine firing work of the plug is done through the electricresistance coil 46 projecting from the end of the plug body inside. (as shown below) the engine wall 12. Member 46 is preferably made in convenient conventional coil form with two terminal ends 48 and 50. The first end 48 enters a perforation 52 formed for it in the body of plug body 16 and is detachably held in place by suitable set screw 54. As the coil is grounded through this connection through the engine, no external electric wire connection is needed at this point. The other end 50 of the'coil leads through a perforation 56 in core20-24 up to its'upper end as shown in the drawing where the turned over end 58 of wire 50 is detachably clamped between the end of member 20 and an angular surface 60 inside nut 36.

\Vhen the parts are assembled as shown, current from the battery 38 passes through members 40, 42 and 36 to the end 50 of the coil, and thence through end 48 to grounded body of the plug 16 and screw 54. \Vhen for any reason it is necessary to remove coil 46 for replacement or otherwise, the operator has only to remove the screw 54 and the nut 36, whereupon after straightening up the end 58 of member 50 the coil is instantly removable and a new one can be inserted in its place in the obvious manner. It will be noticed that core 2()-24 extends through the plug body 16 and thus supports, in an insulated manner. the resistance coil 46-at the inside edge of engine wall 12.

Having thus described my invention what I claim as new and desire to secure by Letters Patent is 1. An ignition plug having parallel longitudinal passages, and aresistance coil havin respective integral end portions straightened and extending in parallelism whereby movement of the coil in one direction will engage said end portions in respective passages and opposite movement of the coil will disengage the end portions from said passages, and means for releasably securing said end portions of the coil in said passages.

2. An ignition plug including a body portion. a core extending through and insulated from the body portion, a resistance coil located at one end of the plug, said plug body and core each having a longitudinal passage therein, said passages respectively receiving the ends of said coil, and means for detachably securing the ends of the coil in said passages.

3. An ignition plug comprising a body portion," a core extending through and insulated from the body portion, a resistance coil having one end detachably secured to the body portion and its other end extending through said core. said last mentioned end of the coil being bent into engagement with an end of the core, and a clamping nut threaded on the core and engaging the bent end of the coil to secure the same in place.

In witness whereof, I have hereunto subscribed my name in the presence of two witnesses.

. ALFRED PETER.

\Vitnesses F. G. HOBART, B. H. ARNOLD.

Images