US1037307A - Spark-plug. - Google Patents

Description

s. PIERREL.

SPARK PLUG.

. APPLICATION FILED AUG.10, 1911.

Patented Sept. 3, 1912.

outrun era a a r eerie SPARK-PLUG.

Specification of Illetters Patent.

Application filed August 10, 1911.

Patented Sept. 3,1912.

Serial No. 643,426.

To all whom it may concern Be it known that I, ANTHONY S. PIERREL, a citizen of the United States, residing at Washington, in the parish of St. Landry, State of Louisiana, have invented certain new and useful Improvements. in Spark- Plugs; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to an improvement in spark plugs and has for its principal object to provide a plug which can/be easily cleaned.

Anotherpbject of the invention is to provide a plug of the character described which is provided with means, for eliminating the spark when being cleaned.

A still further object of the invention is to i provide a spark plug, which is composed of a minimum number of parts, is therefore simple in construction, and is cheap to manufacture.

With these and other objects in view, the invent-ion consists in the construction and novel combination of parts hereinafter fully described, illustrated in the accompanying drawings, and pointed out in the claims hereto appended; it being understood that various changes in the form, proportion, size and minor details of construction within the scope of the claims, may be resorted to without departing from the spirit or sacrificing any of the advantages of the invention.

In the drawing: Figure 1 is a side elevation of a spark lug constructed in ac cordance with my invention. Fig. 2 is a longitudinal sectional view through the same.

Like reference numerals designate correspending parts in all the figures of the drawing.

Referring to the drawing, 5 designates the metal body of the plug, and this body is formed with a reduced and exteriorly threaded end 6, the face 7 of said end being inclined. Formed in said body is alongitudinal bore 8 and a counterbore 9. Disposed within the bore and projecting through and beyond the bore is an insulating sleeve 10 of porcelain or the like, said sleeve having a circumferential rib 11 adapted to be seated upon the shoulder L formed by said counterbore. The sleeve is formed with a longitudinal bore 12, and

upper and lower counterbores 13 and 14 respectively. Disposed within said bore 12 1s a contact rod 15, one end 16 projecting beyond the counterbore 13 and provided with a finger-piece 17 by means of which said rod may be turned. The other end 18 of the rod projects beyond the counterbore 14 and the inclined face 7 of the body, and is laterally bent as indicated by 19 whereby when in one position it will be in close proximity to the lower end of the inclined face 7 and in the opposite position to be spaced a considerable distance from the upper end of said face. Thus, when in the former position, a spark can jump from the rod to the body, but when in the latter position, the air space will prevent any such spark and consequently there will be no explosion in the cylinder of the engine to which the plug is attached. In order to prevent oil from working into the bore 12 of the sleeve, there is provided a packing 20 in the counterbore 1 1, and a ring 21 is employed to retain said packing in place, said ring being integral wi h the rod.

A collar 22 is positioned upon the rod 15 below the finger-piece 17 and disposed around the rod and having one end bearing against said collar and the other end seated within the counterbore 13 of the sleeve, is a coil spring 23 which yieldingly holds the rod in its normal'position.

A nut 21 is disposed around the sleeve above the rib 11, and has threaded engagement with the counterbore '9 of the body for retaining said sleeve against longitudinal movement.

In practice, when it is desired to clean the plug, the rod 15 is turned until the contact point ,is below the upper end of the inclined face 7 of the body. The rod can then be reciprocated, and the ring 21 carried thereby will remove any oil or other matter from the oounterbore 1 1, without causing any spark and consequently without danger of accidentally starting the engine.

What is claimed is:

1. In a spark plug, a body having one end formed with an inclined face, an insulating sleeve disposed within the body, and a longitudinally disposed rod rotatably mounted in said sleeve for rotary movement and having one end laterally bent and disposed beyond said inclined face to form in one position a spark gap between the rod and the inclined face of the body and in another position to yond the body and adapted for both longitudinal and rotary movements, a ring secured to said rod and disposed within the counterbore, a packing disposed around the rod above the ring, the end of the rod contiguous to the inclined face being bent laterally, a finger-piece mounted on the other end of the rod for rotating the same, and a coil spring disposed around the rod between the body and the finger-piece for yieldingly 20 holding said rod in its normal position, said lateral end of the rod being adapted to form in one position a spark gap between the-rod and the inclined face of the body and in another position to space the lateral 25 end of the rod from the inclined face of the body a sufilcient distance to prevent a spark gap being formed.

In testimony whereof, I afiix my signature, in presence of two witnesses.

ANTHONY S. PIERREL. Witnesses:

A. B. ANDERSON, ALBERT D. FISHER.

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