US1415062A - Delayed cut-off for gas burners - Google Patents

Description

R. D. SMITH.

DELAYED CUT-OFF FOR GAS BURNERS. APPLICATION man JULY 24. ms. RENEWED SEPT. 30. 1921.

Patented May 9, 1922 stares RAYMOND D. SMITH, 015 BOSTON, MASSACHUSETTS, ASSIGNGR TO SHAWIVIUT MACHINE 'W'ORKS, ENG, A CORPOB-ATIQN OF'MAIITE. I

CUT-OFF Application filed July 24:, 1918, Serial No. 110,851

To all whom a may concern:

Be it known that I, RAYMOND D. SMITH, a citizen of the United States, residing at Boston, in the county Sulfoll: and State of Massachusetts, have invented certain new and useful Improvements in Delayed Cut-' Offs for Gas Burners, of which the follow ing is a full and complete description.

My present invention relates to new and useful improvements in automatically delayed cut-offs for illuminating gas burners of the open flame type, particularly of the form hereinafter described.

The type of automatic cut-off that I preferably employ is similar to that described in my co-pending application Serial No. 110,950,the present improvement concerning principally the application of this type of cut-off to a flame protected, turn-down burner of the open flame or fish-tail type, so called.

I have illustrated my invention herein, in a form of gas burner having in combination with the main valve and burner stem a small capacity by-pass conducting around the valve and into the stem, and having a pilot flame projecting cage or lantern chamher that, in normal ope "ation of the main burner, is lowered or retracted from the ori tics of said burner, such cage or chamber being cylindrical, and also symmetrically disposed about and vertically slidable on the burner stem.

In applying my above-mentioned automatic cut-off to this type of burner, I have provided a composite burner and valve structure that possesses novel advantages in that, through a single, self-contained illuminating burner unit, full light may be had for leaving the premises after actuation of the valve controllingagencies for causing a delayed automatic .tiirn-down of the main burner flame, the smaller main burner flame or pilot light being left constantly burning after such automatic turn-down to uide subsequent approach to the burner for turning up the light.

In the compact and simple burner and valve arrangement herein disclosed, the heretofore mentioned slidingcage is necessarily interposed in part, between the main burner orifice and the orifice of an auxiliary burner that comprises part of the cut-off governing agencies. Accordingly, a specific object of the present invention is so to arrange the Speoitcation of Letters Patent.

en GAS ,BURNEE$- Patented May 9, 1922..

. B enewed September 30, 19 21 Serial No. 504,492.

relative disposition of this cage and said auxiliary burner that automatic ignition of the auxiliary burner from the flame of the main burner shall not only be unimpaired by the protecting cage, but shall be facilitated thereby. v i Control of the movement of this cage is had by s mple mechanical connection from the oscillatory valve plug thereto, such connection maintaining a constant relation between the vertical position of the cage relative to the main burner orifice and the rotative position of the valve plug which determines the amount of gas delivered to such ma n burner, and thereby the size of the main burner flame. Y Other details of my invention and the purposes thereof will appear from the accompanying drawings and description, wherein I have shown and described a preferred embodiment of my thermostatically retarded cut-off. I shall point out more specifically the new and useful features of my present invention in the appended claims.

In the drawings; Fig. 1 is a rear partially sectioned elevation of my thermostatically retarded cut-off applied to a combined illuminating burner and valve structure such as may be used as a lighting fixture by attachment to a conventional gas-bracket or chandelier, parts being positioned for normal operation of the illuminating burner: Fig; 2 is an enlarged partial section through the gas-controlling valve ports taken v on the plane 2-2 in Fig. 5 showingthe relative position of ports when the device is arranged fornormal operation of the main illuminating burner; Fig. 3 is a view similar to Fig. 2 but showing the relative position of valve ports after manual actuation of the control means and before the auto- :matic cut-off of the main gas supply has been accomplished; Fig. 4: is also a view similar to Fig. 2 showing the relative position of valve ports after the automatic cutoff of the main gas supply has taken place. Fig, 5 is a plan view of the structure shown in Fig. l with parts positioned as in Fig. 7 the casing and certain other parts being cut away and the cage and burner stem omitted to more clearly show the valve actuating mechanism; Fig. 6 is a partial front View in elevation showing a somewhat modified form of cage; Fig; 7 is a complete front elevation of the structure shown in Fig. l

@s eas es with casing omitted to show the valve controlling mechanism, parts being shown in a position corresponding to Fig. 3; Fig. 8 is a right elevation of the complete structure showing the position of the cage after automatic cut-oil ot the main supply has been effected.

Corresponding parts are indicated in the drawings and referred to in the following description by like numerals.

In the drawings, the illuminating flame oi? the main burner appears at 10, and the usual burner stem 11. The latter is mounted upon the main valve block 12 at he externally portion ot the An intern threaded portion id for mount- 1ire structure on a gas bracket or liltoi ipg the chandelier.

ln the valve block 12, intermediate to its t readed portions 15 1 1 and extending at right angles to 5 thereof is a tapered hole which serves as bearing for the tapered valve plug 15. This valve in the manner at an ordinary gas cock is perforated midway its length by the diametrically extending passage 16, said. passage being ar- ..lllg6(l to fall in alignment (in a certain rotative position oi the valve plug) with corresponding passages or ports 17 and 18 leading to the threaded portion 13 and 1 respectively of the valve block.

ln longitudinal alignment with, and at a radial angle with, the passage 16 and extending radially from the latter to the outer surface of the valve plug is a smaller port 19, which, in suitable rotative position of the valve plug 15, registers with a small port 20 in the valve block 12, as shown clearly in Fig. 3. The port 20 leads horizontally to an auxiliary heater burner 21 contained in one of the bracket like extensions 22, 22, of the valve block l2. The construction oi? the heater burner 21 is such as constitutes a form of Bunsen burner wherein a needle valve control of the escaping is had by means of the adjustment screw 1n the valve block 12 on the opposite side of the valve plug l5 from the auxiliary burner 21 is a lug formation through which a small upwardly slanting aperture 25 extends trom an exterior surface of said lug to the passage 1'? in the valve block. The outer end oi this aperture 25 is threaded to receive am to be plugged gas-tight, by an adjustmen sc w 26. The end of this screw is arranged to lie transverse of another upwardly slanting aperture 27 extending from the passage 18 in the valve block 12 to the first mentioned aperture and subste itially at right angles to the latter, so

that this screw is effective to control the duit tor the gas from the source of gas supply to ti o burner stein ll (independent of control by the valve plug 15).

vides, in general, a means for conveniently and rigidly carrying the various stationary mechanical parts that cooperate with the movable parts of the valve mechanism and also serves as convenient fastening means for a casing which with the exception of the necessary openings "for the extrusion of operative parts, totally encloses the valve mechanism. The valve stem 30 has loosely mounted thereon a spacing collar 2% and a double-ended, oscillatory control lever and carries axially external of these parts at its end, and made fast "hereto by a key screw 42, a double-extensional dog member 36* One extension 3'? oi the dog member 86 is bent baelnvardly parallel with the axis of the valve stem and engages positively in one rotative direction with the upper edge ot' the control lever 85.

Loosely coiled about the hub of dog member 36 is a helical wire spring 38 which at one end is hooked about the lower edge of control lever and at the other end engages with the extension 37 of the dog member. A slight torsional tension in said spring maintains the control lever and the extension 37 or the dog member normally in contact but by yielding, this spring may allow a relative rotative movement of these parts to the position shown in Figure 7 at a certain time in the operation of the valve. A slight axially exerted tension in said spring always maintains the valve plug 15 securely in its seat under uniform axial tension.

The dog member 56, has a radially extending portion diametrically opposite the extension 37, which portion at its outer end is straddled by yoked latch member 46 pivoted thereto by a stud 47. The stud l? is fast in the extension 45 but loose in the yoked latch member e6, so that the latter is free to turn in one direction against the tension of a line wire spring l8, which is loosely coiled about the stud 47 and at one end tastened thereto. The other end of the spring L8 engages the latch member 46 so normally to maintain the latter positioned against a seat provided by the very extrenr ity of the extension a5. This normal position of the latch member 46 relative to the extension 45 is shown in Fig. 7.

Lying in the path of movement of the latch member 46 is a spur-shaped detent 52 carried by, and securely fastened to, the innor face of a curved bi-meta-llie thermostat 53. This thermostat, in the plane of its least dimension, conforms for the most part to the arc of a true circle substantially concentric with the axis of the valve )l ug, and comprises two conformed strips of different metals having widely different expansible properties such as brass and steel, made fast to each other uniformly throughout their length, with the brass or greater expansible metal on the inner side.

The thermostat at one end is rigidly mounted to an extension 54: of the supporting plate 31 by screws 55, 55, and in all other parts is free for thermally caused flexure outwardly or of a straightening nature.

A metallic heater member 56 is shown clamped in surface contact with the thermostat at the mounted end thereof and extends rearwardly, outside of the mechanism housing. This heater member, as clearly shown in Figs. 1, 5 and 7, terminates in a hollow conically shaped hoodportion 57 having a small opening 58, at its top and lying directly over the auxiliary burner 21, being slightly raised therefrom.

The general position of this hood'which is wholly open at the bottom, and of the small perforation in its top, is such as to fall in vertical alignment with the auxiliary burner 21 and the main flame 10. Gas rising from the burner 21 is therefore collect ed by the heater hood portion 57 and allowed to escape upwardly through the opening 58 in the top of same directly toward the flame 10. Upon ignition from the main flame, gas from the auxiliary will burn at the mouth thereof with a hot blue flame. This flame will play directly against the heater hood 57 which is adapted to extract heat therefrom and transmit such heat by conduction to the thermostat.

At its free end 60, the curvature of the thermostat departsfrom conformation to the arc of a true circle and extends somewhat more inwardly. Internally adjacent to and nearly in contact with this inwardly curved extremity of the thermostat is a. loose roller 61 carried by a stud which is mounted upon the supporting plate 31. A. retaining screw 63 serves to keep the roller in place. The function of this roller abutment is to reenforce the thermostat when the latter is made operative to restrain the movement of the dog member 36 by engagement of spur mem ber 52 with latch member 46 as shown in Fig. 7.

To one end of the control lever 35 is directly attached a control chain 65, at the other end, a latch lever 66 is pivoted at 71 for the purpose of automatically locking the control lever 35 in the position shown in Fig. 7 when the control lever is made to assume this position by a pull on control chain 65.

This automatic. lockingor latching of the control lever is accomplished by the engagement of a catch formation 67 at the end of one arm of the lever 66, witha projection 78 of the supporting plate 31, the latch lever beingnormally held in position to so engage such projection by a light wire spring 73, carried on the control lever 35 and bearing upon the bent extremity 69 of same and upon the latch lever 66, as best shown in- Fig. 7. At the extremity of its other arm the latch lever carries a control chain 68, which by a pull thereon, will swing the latch lever'66 to the broken line position indicated in Fig. 7. This accomplishes the unlocking of the control lever 35 and further pull on chain 68 will be positively transmitted to the control arm, movement of which is now permitted.

Stops are provided to limit the movement of the control arm at each extremity of its swing, by the extension 5a of the support plate 31 and by said projection 78.

Referringto Fig. 1 particularly, a pilot flame protecting cage or lantern chamber is shown at 82, such cage having a loosely slidable bearing 83 on the valve stem 11 and a series of elongated openings 84 in its circular side wall said openings being completely covered by a cylindrical mica lining 85 extending entirely around the inside of the cage. The cage is perforated-by a circular series of small draft holes 86 at its top and bottom portion for allowing the entrance of enough air to supportthe combustion of the small pilot flame shownat 87 in Fig. 8. One of these bottom draft holes is engaged by the double-fingered terminal 88 of a crank link 89. At its opposite or lower end, this crank link is pivoted to the end of a crank arm .90 which extends radially from the larger end of the valve plug 15 and is made fast thereto by a slotted mount? ing 91 and a retaining screw 92. Movement of the cage up and down is thus caused by the swing of the crank arm 90, with the oscillatory movement of valve-plug15.

In describing the operation of my invention, I will refer to Figs. 2, 3 and l wherein the main passage 16 in valveplug 15 is shown enlarged at one end by a counterbored re cess 80, that serves to prevent constriction of the opening from passage 16 into the passage 18 in the positionof parts shown in Fig. 3, where gas is being supplied. to both themain burner and auxiliary or heater burner 21. I

Starting from the position of parts as in Figs. land 2 where the valve is arranged for normal supply of gas to the main burner for illuminating purposes and for an indefinite time, when it is desired to extinguish the light, control chain 65 is pulled downwardly which rotates in unison the control lever 35 and, through the medium ofspring 38, thedog member 36 until-the latter is in- 'ercepted by engagement of its latch member as with the spur detent 52. The control lever, however, is now swung further against the action of spring 38 until it is automatically locked in the position shown, in Fig. '7 as previously described. Corresponding to the position of dog member 36 in Fig. 7 the valve plug is now positioned as in Fig. 8, where it is clearly shown that no appreciable reduction of the gas supply to the main burner has been caused by movement of the value plug, but where the auxiliary port 19 in the valve plug has been made to register with the auxiliary port 20 in the valve block and where the cage 92 has been raised to the position shown in Fig. 7. Gas is now supplied to the auxiliary burner 21, and, rising, ignites from the flame of the main burner which is directly above it, both main and auxiliary flames burning as shown in Fi 7.

As heat from the auxiliary flame is fed into the thermostat by the heater member 56, the former bends outwardly to the broken line position indicated in Fig. 7, thus releasing the dog member 36 which is thereupon impelled to its normal position, relative to the control lever 35 by the tension in spring 38. This latter movement of the dog member rotates the valve plug 15 to the position shown in Fig. 4. Here the gas supply through the valve plug 15 to both main and auxiliary burners has been shut off and the cage has been raised to the position shown in Fig. 8 for protection of the small pilot flame which is left burning at the main burner orifice due to gas delivered through the by-pass aperatures 25 and 27.

When it is desired to again obtain ful. light from the main burner, control chain 68 is pulled, which first disengages the latch 66 from projection 78 and then swings control lever 35 and thereby dog member 86, by positive engagement therewith, to the position indicated by broken lines in Fig. 7 and at the same time lowers the cage 82 to its original position as in Fig. 1. During this latter movement of the dog member 36, the latch member as will yield when passing the spur detent 52, if the latter at that time has been restored to its normal position by cooling of the thermostat.

The parts will now remain in this position for normal operation of the main burner until the chain 65 is again pulled to extinguish the light.

The foregoing description concerns a preferredembodiment of my invention in its simplest forms. There are, however, many additions and modifications which could be made in the structure to serve useful purposes, one example of which is shown in Fi 6.

ere the cage 82 is provided with a downwardly extending curved shield 93 which overhangs the heater hood 56 serving to collect and to better guide the gas from the auxiliary burner 21 upwardly and then through the enlarged opening 9e1- in the bot tom of the cage and on upwardly through the cage to the main flame. More reliable ignition of gas from the auxiliary burner 21 is thereby obtained.

It will be evident that, if desired, a small pilot flame such as the flame 87 in Fig. 8 could be had by an incomplete closure of the main valve instead of by a constantly open by-pass conduit, or in other words, by an arrangement of valve ports which in the position of the valve plug 15 in Fig. 1 would allow of a small opening from pas sage 16 to passage 17 With such arrangement, however, no adjustment of the size of this flame would be had such as screw 26 affords in the bypass arrangement which I have illustrated in the drawings.

It will be understood that the specific structure described and depittcd herein is chosen for illustrative purposes only, and that many departures could be made therefrom fully within the scope of my invention.

lVithout therefore, limiting myself to the exact embodiment disclosed what I claim is 1. In combination; a main gas burner and valve structure embodying automatically acting mechanism for operating the valve and including a separate and auxiliary gas burner positioned to be automatically ignited from said main burner thereby to control the action of said mechanism, and a partial closure device movable to different positions relative to said main burner respectively to shield and to expose the flame thereof,said movable device being arranged and adapted to direct the flow of gas from the auxiliary to the main burner, thereby to cause ignition of the former from the latter.

2. In a gas burner and controlling valve arrangement, including a main burner, an auxiliary burner, normally inactive and positioned below said main burner, to be automatically ignited by the flame of the latter when gas is delivered to such auxiliary burner, and automatic means for actuating said controlling valve embodying a controlling thermostat operably related to said auxiliary burner, in combination; a partially closed chamber structure vertically movable into and out of a position encompassing the orifice of said main burner, and having at its bottom an opening positioned over said auxiliary burner, said chamber structure also having an opening at its top for the escape of gas rising through said chamber; and means operatively connecting said chamber with said automatic actuating means.

3. In a gas burner and controlling valve arrangement, including a main burner stem, an auxiliary burner, normally inactive and gas, in combination; a partially closed chamber structure vertically slidable on said main burner stem into and out of a posltlon encompassing the orifice of sald stem, and having at its bottom an opening with a down- Wardly extending and outflaring lip over-' hanging said hooded portion of the heat conducting member, said chamber having an opening at the top to allow the escape of gas rising through said chamber; and means for positively connecting said chamber structure With said movable member of the valve.

Signed in Boston, Massachusetts, this 22nd day of July, 1916.

, RAYMOND D. SMITH. Witnesses:

E. L. MGF'ADDEN, J E. BLAGKMAN.

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