US1685017A - Valved spark plug - Google Patents

Description

Sept. 18, 1928. 1,685,017

J. G. BOWMAN VALVED SPARK PLUG Filed July 25, 1927 INVENTOR.

(75in; G. Bowman A TTORNEY.

Patented Sept; 18, 1 928.

1* UNITED sIrArEs ceremonies J'OHN G. BOWMAN, OF KAIYSAS CITY, MISSOURI; ASSIGN'Q'R, OE ONE-HALF T0 W L IAM G/HASELTINE, 0 F KAN SA S GIIY, MI SSOURI.

VALVED. SPARK PLUG.

pll e iw; merrily 2. 22 f r ei 208,201.,

The invention relates to valvedsparkplugs, and particularly to: sparl tplugs constructed with ventilating valv6 .:-tl1at is, with means for admitting airftllrough the sparkplugs It is animportant aim of the inycntion to provide a novel coordination, of the valve and the cylinder oitan internal combustion motor to the end, of elfecting efiicientt'unctioning. of: the, Valve device for. admission of air. through the plug, and to of gases, at the samejtime that the appliance operates quietly with. a. minimum-oi; wear. It is a further aim to enable. the, ein'bodis ment of the, valve for such plug. in an extremely inexpensive fornn Additional objects, advantages and features of invention reside inthe construction, arrangement anclcombination of. parts, as will be understood from followingrdescription accompanying drawings, wherein i Figure 1 isa. central verticalsectionalviewv of a plug const nugtedlin :accordancewith my invention. Figure 2 is an enlarged central longitudinal sectional view ofthe valve, alone.

Figure 3 is an elevational view of the valve case.

Figure 4 is a view similar to Figure 2 of another embodiment of the invention.

There is illustrated a plug 10 engaged in the head of a cylinder 11 of an internal combustion engine, the plug being of a conventional construction including the case 10, a porcelain core electrode 13 and retaining gland 14 for the electrode. A horizontal in teriorly threaded opening 15 is formed through the case 10 inwardly of the shoulder of the porcelain, and'screwed into the opening 15 there is a thimble-like cylindrical valve casing 16, adapted to .be drawn from sheet metal. This is exteriorly threaded at its open end and screwed snugly into the passage 15. Intermediately of the length of the case 16 aport 17 is formed, while the inner end edge of the case is curved inwardly as at 22'. Loosely slidable in the case 16 there is a valve 19 similar to the case. having' its outer end integrally closed by a head, while its inner end is open. One or more ports are formed in the side of this valve or a series of ports, and alined with these a circumscribing groove 21 is formed, which prevent escape,

may be produced by indenting the periphery of the valve by'spinning or otherwise after having first beenidrawn to thimble shape; It is to be noted: that the valve 19 has a lead or closed; end 22 snugly and slidably fitted in the case 16. The port ,i 17 beingspaced asu-bstantialdistance from the. outer closed, end 18 ofthe" case 16, it

will be seen that a certaindash-pot action' will occur in the movement 055 the valve head 22- in, that part of the case outwardly oi the port 17. The distance between the inturned end portion 22; of the case 16 and the port 17 is the sameas the distance be tween the inner or open end of the valve 19 and groove 21, so that when the end: oftho valve rests against the inturnedporti'on 22" the groove 21 isalined with the port 17.

In, the manufacture of this device, the case. is formed as a simple headed cylinder without the inturned portion 22" and the valve formed completely, so that it is adapted to! function suitably in the case; The, valve is; then introduced in the case and the, edge of the case turned in at 22 so that when the valve rests against the inturned portion, the groove 21 will aline with the port 17. The threads upon the case may be formed 7 in the manufacture, and after assembly of the parts as indicated, may be screwed into the passage 15 of the plug until its inner end lies at, or adjacent, the inner face of the plug-case, but stopping short of the porcelain core.

In use, when a motor equipped with this plugis oncompress'ion stroke, it will be the cylindrical at any convenient stage seen that the valve will be forced outwardly I into the case 16, and will so remain during the working stroke and the scavenging On the suction or intake-stroke of the engine, however, it will be apparent that the valve will be drawn inwardly so that the groove 20 alines with the port 17 shown, which is of material advantage in such devices where quietness of operation is desired. A. substantial space or dash-pot 23 is formed in the outer part of the ease beyond the port 17 and on the compression stroke, the tendency of the [valve :to be moved abruptly to the outer limit of its movement is checked by dash-pot action in the portion 23. Similarily, at the beginning of the-intake stroke of the motor a slightly vacuous condition produced in the dash' pot after a certain amount of movement the valve toward open position will prevent it-from fimoving so rapidly to the inner limit of its 7 ing, and 'a suitable vent 25 provided to permovement as to produce any objectionable click, and this will also minimizewear u )on the inturned part of the case and the end of the valve. r i

Any gas which may remain under pressure in the outer end of the case on completion of the working stroke will gradually move the valve toward open position on the scavenging stroke or at the completion 1 thereof.

It is possible to construct my valve withoutthe use of dash-pot action but with a cushion for the valve of mechanical construction, as shown in Figure l, where in place of the dash pot chamber 23 a packing 24 is introduced in the closed end of the casmit free action of the valve until checked by the cushion. Under opposite movement of the valvethat is, to open r,posit-ionnecessity for cushioning is less, and sound is minimized by reason of the rapid movement of air inwardly through the port of valve toward the open end of the case, said the case, means to limit movement of the valve having a lateral port constructed and arranged to tommunicate with the port of the case" when adjacent the'outer limit of its movement in the case.

2. In a valve of the character described, a tubular casing having a closed head at one end, a valve of like form slidable in the case with its head next the head of the case, said valve having a port in the side spaced from its head,said case having a port in its side differently spaced from its head and adapted to register with the port of thevalvewhen the valveis at one limit of its movement.

3. In a valve of the, character described,

a case of tubular form having a closed end and an open end, a lateral port intermedi ately of the length ofthecasing, a cushion material within the case at the closed'end, a valve of similar form snugly slidable in .the case with its 'closedend toward the cushion and having a lateral portadapted to aline with the port ofthe case at one extreme limit of movement of the valve.

In testimony whereof I afiix my signature.

JOHN G. BOWMAN.

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