US1871191A - Automatic gas valve - Google Patents

Description

1932- A. J. MILLIGAN AUTOMATIC GAS VALVE Filed Nov. 27, 1929 ENTOR,

Alb art I. In:

la 1 J ATTORNEY,

Patented Aug. 9, 1932 Parana arias ALBERT J. MILLIGAN, or SAN FRANCISCO, CALIFORNIA AUTOMATIC GAS VALVE Application filed November 27, 1929. Serial No. 410,091.

This invention relates to improvements in automatic gas valves, and more particularly to gas valves for cooking stoves.

The principal object of the invention is to save gas consumption .by providing means to automatically turn on the gas when a utensil is set over the burner, and turn off the gas when the utensil is removed. Other ob- ]ects and advantages will appear as the description progresses.

In this specification and the accompanyingdrawing the invention is disclosed in its preferred form. But it is to be understood that it is not limited to this form, because it may be embodied in other forms. It is also to be understood that in and by the claims following the description it is desired to cover the invention in whatsoever form it may be embodied.

In the one sheet of drawings:

Figure 1 is a side elevation of a gas burner and a part of a gas stove having this invention applied thereto.

Figure 2 is an enlarged vertical section view of the-gas valve in normal closed position.

Figure 3 is a fragmentary similar view showing the valve in open position.

In detail the construction illustrated in the drawing, referring to Figure 1, comprises the conventional gas stove top 1, having the down-turned flange 2, and the grids 3, extending radially across the burner openings in the top of the stove.

The burner is mounted below the opening and projects its heat upward between the grids 3. It comprises the perforated flame top 4, surmounting the mixing chamber 5. The throat 6 extends from the mixin chamber and terminates in the aspirator The usual louver 8 cooperates with the front of the aspirator to regulate the volume of air admitted to the mixing chamber. This is the conventional gas stove, the details of which will vary, but to all of which this invention may be applied by modifications well within the purview of the invention, by those skilled in the art.

The invention is interposed between the usual gas manifold pipe 9 and the burner.

The gas valve has the nipple 10 screwed into the pipe 9. The nozzlell extends through the front of the aspirator 7 coaxial with the throat 6.

The hole 12 extends through the body 13, the nipple 10 and the nozzle 11, to feed gas to the aspirator.

There is a transverse hole 14 through the body 13, intersecting the hole 12. The pilot tube 15 is fixed in this hole 14 on one side of the body 13. The stem of the valve'16 is threaded into the other side and adapted to completely close the holes 12 and 14 to regulate or shut off the gas to the burner'and the pilot 15. The automatic valve comprises the piston 17 slidable in the vertical hole 18 in the body 13, also bisecting the hole 12.

- The upper portion 19 is made heavy to cause the piston to descend. It is centrally bored to receive the telescoping stem 20, held by the set screw 21 threaded in the portion 19.

The sleeve 22 fixed to the weight 19 telescopes over he neck 23 of the body 13, to prevent accumulations of grease or spilled food entering the valve 17 l8. 75

The fulcrum bracket 24 is attached to the body 13 by the screw 25 and extends above the top 1 of the stove and is bent upward to form the bifurcated fulcrum 26, adjacent the V edge of the burner hole. 30

The operating trip lever 27, pivotally encircles the stem 20 under the head 28 and rests in the fulcrum 26. I The trip end 27 of this lever 27 extends abovethe plane of the grids 3, to about the vertical axis of the burner.

This invention operates substantially as follows:

The valve 16 is turned until it uncovers the hole 12 and the end of the pilot tube 15. The pilot is then lighted, which projects a pilot flame over the burner 4. I

A cooking utensil placed on the grid'3 depresses the tip of the lever 27, rocking it on the fulcrum 26 and lifting against the head 28 of the stem 20 to raise the piston 17 and uncover thehole 12, admitting gas to the burner from the pipe 9, as shown in Figure 2. The burner. ignited by the pilot, continues to project its flame against the utensil until it is lifted off the tip of the lever 27.

When the utensil is lifted, the weight 19 causes the piston 17 to descend and close the hole 12. The end of the piston descends into v the end of the hole 18 which is below the hole i5 12 and acts as a dash pot? to ease the final descent of the piston.

The volume of gas to the burner may be regulated by turning the valve 16 in and out to vary the area of the hole 12 at this point.

The set screw 21 permits adjustment of the bracket 24 to render the invention applicable to stoves having varying heights from the pipe 9 to the top of the stove 1.

The end of the lever 27 encircles the stem under the head 29 and forms a fairly close fit therewith. WVhen the lever 27 is tilted out of its normal horizontal position by the weight of a utensil, theend of the lever 27 binds the stem 20 after the valve is opened. This prevents excessive movement of the valve mechanism. However, it does not prevent the removal of the valve by direct upward movement of the head 28.

Economy in construction can be accomplished by utilizing appropriate lengths of tubing telescoped one over the other, forced together and held by frictional contraction.

The weight member 19 can be forced over the upper end of the piston 17 the lower end of which is plugged. The sleeve 22 can be forced over the lower end of the tubular Weight 19. This assembly eliminates expensive lathe work and permits the use of standardized tubing. 2

Having thus described this invention what. I claim and desire to secure by Letters Pat.- ent is:

1. In combination with' a gas burner, a valve body having a passage therethrough, said valve body having an opening therein, intersecting said passage, acylindrical piston operating in the opening of said valve stem telescoped within the tubular piston, and a trip lever operatively engaging said stem.

4. In combination with a gas burner, a valve body having a passage therethrough, an automatic valve controlling said passage, and an adjustable bracket rigid with said valve body and extending over the stove top above the burner, a trip lever fu'lcrumed on the end of said bracket and operatively engaging .saidautomatic valve and extended above said burner, a pilot'tube fixed in said body and Communicating with the passage therein and extending to said burner, and a manual valve adapted to close said passage and pilot tube.

. 5. In combination with a gas burner; a valve body havinga passage therethrou'gh; said valve body having an opening therein intersecting said passage; a piston operating in theopening of said valve body, the lower end of said piston being adapted to close the passage in said valve body; a trip leverfuL crumed above the burner and adapted to raise said piston entirely above said passage.

In testimony whereof I have hereunto at fixedniy signature.

' ALBERT J. MILLTGAN V sage, the lower end of said piston being I adapted to close said passage, a stem in said piston, a trip lever engaging said stem and adapted to bind said stem after a limited movement.

In combination with a gas burner, a

valve body having a passage therethrough,

said valve body having an opening therein intersecting said passage, atubular piston operating in said opening, a weight telescoping the upper-end of saidpiston and adapted to lower portion of the weight, an adjustable

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