US1898064A - Insulator for spark plugs - Google Patents

Description

Feb. 21,1933. w. F. RIDGE 1,898,064

INSULATOR FOR SPARK PLUGS Filed Dec. 28, 1927 lll flm. Hu 2 [N VEN T 01? W/u mm A TTORNEYS,

to any standard spark Patented Feb. 21, 1933 'UN ITED STATES PATENT OFFICE WILLIAI 1'. EDGE, 01' AKRON, OHIO IIN'BULATOB FOB SPARK PLUGS Application area December as, 1921. serial Io. 848,080..

The present invention relates to an insulating sleeve or protector especially adapted and intended for spark plug connections, being designed for theprotection of the plug connections from water and to prevent the escape of the electrical sparks from the exposed metal parts of the spark plug.

Thedevice as shown and described herem is simple and easily applied. It can be fitted lug and does not interfere in any way with making the usual connections between the plug and the conductor. The advantages of the insulator will be more fully and completely understood from the detaileddescription contained here- In the single figure of the drawing is shown a standard spark plug with the insulator in place thereon, it being understood that chan es and modifications may be made without eparting from the essential features of the inventio In the drawing, 1 represents the wall of an engine in which is mounted the spark plug 2 of usual construction, having a post 3 on which is threaded the nut 4 securing the usual electrical conductor 5 in position thereon.

'The insulator comprises a sleeve of rubber 6 which is somewhat larger and flaring at its 0 inner end which is adapted to fit and gri over the upper portion or body of the spar plug and preferably having a beaded lower 'edge. The elongated, tapering smaller end of the sleeve fits over the leadlng-in wire or 3 conductor 5, being rolled up at its outer end as shownat 8, the rolling of the sleeve causing the end thereof to grip the conductor tightly. The sleeve, of course, is composed 40 of flexible, resilient rubber in order to perform these functions.-

In applying the insulator, the smaller end I is passed over the conductor and the connection made between the conductor and the spark plug. The larger end may then be drawn over the plug which it will normally grip tightly enough to hold the insulator ,then rolled on itself'to' -j'form th due to the inherent resilience v0 10 may be provided in the insulator to prevent sweating.

The device has advantages of simplicity and utility over prior attempts at similar constructions as it is applicable to the standard form of spark lug and does not interfere with making theelectrical connections at the plug. It is also inexpensive and will operate satisfactorily for the pur oses set forth. The insulator may be molde in curved form, if desired, alth'ough a straight sleeve will operate satisfactorily as well.

What is claimed is:

1. In-combination an insulator and a spark plug having an electrical conductor leading thereto, said insulator comprising a flexible, resilient, rubber sleeve ta erin from a diameter at its larger end a apte to fit snugly about the sparkplug body grip ing the same f the rubber to a diameter atits smaller end to fit snu ly about the electrical conductor, the smafier end of the insulator being rolled upon itself and thereby gripping the conductor.

2. In combmation an insulator and a spark plug having an electrical conductor leading thereto at right angles, said insulator comprising a flexible, resilient rubber 'sleeve formed at substantially a right angle, said sleeve tapering from a diameter at its larger end, adapted to fit snugly about the spark plu body, to a diameter at its smaller end to t snugly about the electrical conductor the smaller end of the insulator being rolled upon itself to thereby gri the conductor, the intermediate portion of e sleeve loosely enclosing the connection between the spark plug and the conductor.

WILLIAM F. RIDGE.

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