US1343626A

US1343626A - Telltale spark-plug

Info

Publication number: US1343626A
Application number: US298659A
Authority: US
Inventors: Harris Isaac
Original assignee: Individual
Current assignee: Individual
Priority date: 1919-05-21
Filing date: 1919-05-21
Publication date: 1920-06-15
Anticipated expiration: 1937-06-15

Description

I. HARRIS. TELLTALE SPARK PLUG.

APPHCMIUN FILED MAY 21. 19:9.

' 1 343 2 Patented June 15,1920.

I V a awwentoz UNITED. sures PATENT OFFICE.

ISAAC HARRIS, F DETROIT, MICHIGAN.

.TELLTALE SPARK-PLUG.

Application filed May 21-, 1919. .Serial No. 298,659.

- of. Michigan, have invented new and useful Improvements in Telltale Spark-Plugs, of which the following is a specification.

The obi'ect of the invention is to provide a spark p ug of simple and efficient construction wherein the proper functioning of the terminals of electrodes is apparent upon inspection without removing the plug or applying any of those tests which are now in common use in this connection, and wherein the tension due to a spark gap inthe sparking circuit may be modified at the will of the operator to suit the conditions under which the plug is being employed.

With these and related. objects in view the invention consists in a construction, combination and relation of parts hereinafter fully explained, it being understood that changes in form, proportion and details may be resorted to, within the scope of the claim without departing from the principles-involved.

Figure 1 is a side view of a spark plug embodying the invention.

Fig. 2 is a longitudinal sectional view of the same.

,Fig. 3 is a transverse sectional view on the plane indicated by the line 3-3 of ig. 4 is a sectional view on the plane indicat'ed on the line 4.-4 of Fig. 2.

The porcelain body portion of the plug is seated within the bowl nut 11 upon a suitable gasket 12 where it is held by means of a gland 13 threaded into the bowl nut and bearing upon a shoulder 14. Said bowl nut is of polygonal contour to form a wrench seat whereby the threaded sleeve portion 15 thereof may be engaged with the motorhead indicated at 16.

The terminals or'electrodes 17 and 18 are arranged in the ordinary way-comment jump spark plugs "with the latter wh 1c is insulated by the porcelainbody portion and extendsaxially therethrough rovided with a collar 19 which is s aced mm the end wall of the cavity 20 y means of a washer 21 which serves to prevent the passage of gases from.the interior of the motor cylinder to the bore of the porcelain body. Below the collar 19 the electrode 18 is preferably provided. with a polygonal wrench seat 22.

This electrode 18 is divided to form

elements

23 and 24 which are separated at their adjacent extremities to form a spark gap located within a transverse recess 25 in the porcelain body of the plug, metallic reinforcing elements 26 being embedded in the latter adjacent to the recess and the upper portion of said body inclosing the recessed zone thereof being surrounded by a glass or similar transparent protective shield 27 through the wall of which the interior of the recess 25 and the spark gap may be viewed from the side of the plug without removal of the latter from the motor.

The upper extremity of the lower electrode member 23 is threaded and fitted with a nut 28 and the 'lower extremity of the upper member of said electrode is correspondingly fitted with a nut 29 by the adjustment of which the extent of the spark -gap may be modified while the terminal 30 of the electrical connection 31 is engaged by a thumb nut 32 threaded upon the upper end of the upper electrode member and is thereby held in contact with a cap plate 33 which.

bears upon the upper end of the porcelain body of the plug.

Obviously, when the spark plug is roperly. functioning there is at each stro e of the motor mechanism a spark or flash at the spark gap represented by the adjacent extremities of the members of the positive electrode 18, and the absence of such a spark is an indication to theoperator that the connections are at fault and and the extent of the gap mines the increase in tension of the current at the sparking terminals within the en 'ne cylinder andbe varied by the. adgust vious'ly deter.

ing means above described to secure the desired results and the eonditionses they may he found to exist in practice.

Claim A spark plug having an insulating body provided at an intermediate point with a transverse terminally open recess, reinforcing elements embedded in the body adjacent to said recess, a transparent sleeve em- Drawing the body in tlie zone of and closing 10 the extremities of said revess and' a sectional electrode having: its members terminally separated to. form a spark gap Within said recess.

In testimony whereof I ufiix m \'si;1nnture. 15

ture.

Is'AAo HARRIS.