US2626661A - Time controlled fuel feed mechanism for gas burners - Google Patents

Description

H. M DOWELL Jan. 27, 1953 TIME CONTROLLED FUEL FEED MECHANISM FOR GAS BURNERS 4 Sheets-Sheet 1 Filed June 24, 1950 Elma/whom fluyfi jHcDoweZZ;

H. M DOWELL Jan. 27, 1953 TIME CONTROLLED FUEL FEED MECHANISM FOR GAS BURNERS Filed June 24; 1950 4 Sheets-Sheet 2 w m h v w H. M DOWELL Jan. 27, 1953 TIME CONTROLL 4 Sheets-Sheet 3 Filed June 24, 1950 H. M DOWELL 2,626,661

ED FUEL. FEED MECHANISM FOR GAS BURNERS Jan. 27, 1953 TIME CONTROLL 4 Sheets-Sheet 4 Filed June 24, 1950 STW Ym 4; Jim, M2

Patented Jan. 27, 1953 UNITED STATES PATENT OFFICE TIME CONTROLLED FUEL FEED MECHANISM FOR GAS BURNERS 29 Claims.

This invention relates to a time controlled fuel feeding mechanism for gas burners and has as its primary object the provision of a means for automatically stopping the flow of gas to a gas burner which is especially applicable for use in conn ction with the gas burners of kitchen ranges, stoves and the like, this application constituting a continuationin-part of an application Serial Number 156,482, filed by the applicant herein April 11, 1950..

Another object is to provide a time controlled mechanism of the above character which is adapted to be applied as a unitary attachment to the fuel supply line of a conventional gas stove as an auxiliary to the usual manually operable control valve without disturbing the location and position of any of the stove parts, whereby the device is adapted to be installed in stoves as a built in feature.

Another object is to provide a gas feed control unit of the above character which, when applied, may be utilized to effect time controlled stopping of the flow of gas to a burner, or at the option of the operator, may be rendered neutral and then permit manual control of the flow and stoppage of flow of gas to the burner by manipulation of the conventional control valve in the usual manner, whereby when the device is installed in a stove in conjunction with the usual control valve its use or non-use in automatically stopping gas fiOW is entirely at the option of the operator.

Another object is to provide a stove attachment of the above character which is so constructed that it may be placed in and out of operation at the will of an operator without interfering with the normal flow of gas to the gasburner whereby after the mechanism has been set to automatically shut off the gas at a predetermined time such time maybe varied within the limit of the capacityof the mechanism, or the time control dispensed with as occasion may require.

Another object is to provide an apparatus in conjunction with a valve for manually controlling the flow of a fluid to a point of use, which is adapted to be manually set. and then be automatically actuated under clock control to terminate the fluid flow by releasing van open spring actuated (normally closed) auxiliary valve, and which embodies a manually operable reset push button with associated mechanism operable on pushing the button to open the normally closed auxiliary valve, in which the parts are so arranged and co-related as to render sequential operation of the several control parts unnecessary, and whereby, in other words, the setting of the clock control, adjustment of the manual control valve, and actuation of the reset push button may be efiected in any order without interfering with the functioning of the other control parts.

Another object is to provide a normally closed sprin pressed valve with push button actuated means for opening the valve and releasably holding it in its open position in opposition to its spring pressure, together with clock controlled means for releasing the valve holding means whereby the valve will close under its spring pressure, in which the spring pressure of the valve is utilized in restoring the valve holding and releasing means to a normal position in readiness for another operation.

Another object is to provide a mechanism for the purpose set forth including an audible alarm operable to indicate the automatic closing of a valve controlled by the device and consequently cutting oil gas supply where the valve is employed for such purpose.

A further object is to provide a construction and assemblage of operating parts such as to minimize wear or replacement of parts thereby rendering the mechanism capable of many repeated operations without liability of getting out of order.

With the foregoing objects in view together with such other objects and advantages as may subsequently appear, the invention resides in the parts and in the combination, construction and arrangement of parts hereinafter described and claimed, and illustrated by way of example in the accompanying drawings in which:

Fig. 1 is a perspective view of a fragmentary portion of a gas stove showing the invention as applied;

Fig. 2 is a plan view of the unit showing it as attached to a gas supply manifold;

Fig. 3 is a view in vertical section with parts shown in elevation taken on the line 33 of Fig. 2 showing the parts as disposed in their neutral or off position in which the flow of gas to a manually operable valve controlling the flow of gas to a burner is shut off;

Fig. 4 is a view similar to that of Fig. 3 with portions removed and other portions shown in elevation, illustrating the parts as disposed in a running position in full lines and with parts shown in an immobilized position indotted lines; in which positions flow of gas to a manually con.- trolled valve takes place;

Fig. 5 is a detail in horizontal section and plan view taken on the line 5-5 of Fig. 4;

Fig, 6 is a view in section and end elevation as seen on the line 66 of Fig. 3;

Fig. 7 is a fragmentary View in section and elevation with portions broken away as seen on the line '!7 of Fig. 3 in the direction indicated by the arrows;

Fig. 8 is a detail in horizontal section and plan view as seen on the line 83 of Fig. 4 with portions broken away;

Fig. 9 is a plan view of the device similar to Fig. 2 with portions of the housing broken away to show internal mechanism in plan;

Fig. 10 is a detail in vertical section taken on the line liil ii of Fig. 8;

Fig. 11 is an enlarged detail in section and elevation taken on the line I l--l l of Fig. 3 as seen in the direction indicated by the arrows;

Fig. 12 is an enlarged detail in section and elevation taken on the line l2-l2 of Fig. 5 as seen in the direction indicated by the arrows showing the parts as disposed in the running position;

Fig. 13 is a view similar to that of Fig. 12 showing the parts in an immobilized position;

Fig. 14 is a detail in horizontal section taken on the line ill-M of Fig. 11;

. Fig. 15 is a detail in horizontal section taken on the line l5i 5 of Fig. 12;

Fig. 16 is a detail in horizontal section taken on the line lE-l6 of Fig. 13 with portions broken away;

Fig. 17 is an enlarged detail in section and elevation as seen on the line Il-ll of Fig. 6 in the direction indicated by the arrows;

Fig. 18 is an end elevation and section taken on the line i8|3 of Fig. 17 as seen in the direction indicated by the arrows;

Fig. 19 (Sheet 1) is a vertical section taken substantially on the line i9--l9 of Fig. 1; and

Fig. 20 (Sheet 1) is a plan view of a fragmentary end portion of the rocker arm shown in Figs. 8 and 10 illustrating a thrust spring mounted thereon.

Referring to the drawings more specifically A indicates generally the top Wall of a stove fitted with a burner B, and C designates the front wall of the stove which is equipped with the usual manually operable control valve D. E indicates the usual manifold with which the stove is equipped connecting with a source of fuel gas supply and from which gas is ordinarily directed to the valve D through the usual connection F leading from the manifold to the intake side of the valve D, and from the valve D, when open, to the burner B through a throat G leading from the outlet side of the valve D to the intake side of the burner.

The present invention has to do with an automatic auxiliary gas feeding and controlling unit H which is applicable to the manifold E as an auxiliary to the manual control valve D; the unit H being employed in conjunction with a second control Valve J housed within the manifold E in spaced relation to the connection F of the valve D. The valve J embodies a tubular housing at extending diametrically of the manifold E; the housing a having side inlet ports 1) opening to the interior of the manifold E, and an outlet port 0 in its lower end which opens to a by-pass K leading through the wall of the manifold E and along the length thereof and connecting through the wall of the manifold with a gland d which extends upwardly through the manifold E and tightly connects with the intake connection F of the valve D as shown in Fig. 19. The conduit K is here shown as formed of conventional pipe and 4 fittings. This assembly permits ready installation of the auxiliary gas feeding and control unit to the conventional gas stove fuel feed construction.

The upper end of the tubular valve housing a is provided with a cap e formed with an upwardly extending elongated tubular extension having a tapered upper end 9 which seals against an internal tapered seat on the upper end of a nipple h, the lower end of which is screwed into a collar 2' threaded into the top wall of the manifold E. Mounted within the tubular housing a is a valve element comprising a piston :1 adapted when in its lowermost position, to abut a valve seat is at the inner end of the outlet port 0 to close the latter. The piston j is mounted on a stem I which extends upwardly through the cap 6 and its extension J in slidable contact with the latter; a coil expansion spring m bearing between the cap e and the piston y to normally maintain the piston 9' in its lowermost port closing position. The upper end of the valve stem Z is fitted with a head n adapted to be engaged by a rocker arm L to effect opening of the valve J as will later be described. The aforesaid construction is set forth at least in most part in the copending application above referred to.

The unit H embodies an anchor plate M which is supported on the nipple h; it being seated in a channel on the nipple and fixedly held in place against the underside of a shoulder 0 on the nipple by a nut 10 screwed on the upper portion of the nipple beneath said shoulder. The anchor plate M is formed with upwardly extending parallel end walls q and r and mounted on the end wall q in fixed relation thereto in any suitable fashion is a housing N containing a time controlled mechanism 0 including a spiral main spring 5 having its ends attached to the clock frame and to the clock arbor t in the usual manner; the spring s being arranged and tensioned to normally tend to rotate the arbor t in a counter-clockwise direction and thereby actuate the clock mechanism through a disk clutch o fixed relative to the arbor t and having frictional engagement with the side face of a toothed gear wheel at which is loose on the arbor t but is normally turnable with the arbor t through the clutch c to drive the escape train of the clock mechanism in the usual fashion. This arrangement permits manual rotation of the arbor t to wind or unwind the main spring s without moving the clock train since the clutch c then turning with the arbor it will slip over the adjacent face of the train driving gear wheel at. The clock construction is well known in the art and aside from its co-operation with the control mechanism with which it is associated is disclaimed. However in adapting the clock mechanism for use in connection with the present invention the arbor t is tubular.

Mounted on the outer end wall 1 of the anchor plate M is a bell P which is secured to the wall r as by a nut and bolt assembly u, which bell is adapted to be sounded to give an audible alarm, as will be later described. A thin sheet metal housing Q is carried on the anchor plate end walls q and 'r to aiford a covering for the parts carried by the anchor plate.

As particularly shown in Figs. 8 and 10, the rocker arm L embodies an elongated rectangular plate 20 formed with a key-hole slot 2! through the narrow portion of which the valve stem 1 freely extends with the head n positioned in close proximity to the upper face of the plate 20, the slot 2| affording ready assemblage of the headed stem '1 and the rocker arm. The

inner end of the plate '20 is formed with a longitudinally extending open ended slot -22 flanked by side members 23which are out-turned at their ends to form rockers 24 which are supported on the lower margin of a narrow horizontally extending slot 25 formed-in the 'wall'q and the adjacent end wall 25' of the housing N, for limiting vertical swinging movement; the rockers 24 being formed with end fingers 26 which project rearward of the end wall g to hold the rocker arm *L in pivotal engagement with the end wall q.

The outer end of the rocker arm L is formed with an upturned flange 21 with which is connected one end of 'a poise spring '28, the other end of which is attached to-the wall r ata point on a plane below the pivotal connection of the rocker arm L with the wall q; the spring '28 exerting a slight longitudinal pull on the outer end portion of the rocker arm -L which pull is such as to normally poise the rocker arm L in an intermediate position free of the head non the stem Z of the valve J. The action of this spring will be fullydescribed hereinafter.

Formed on the outer end of the rocker arni L is a down-turned extension 29 of the plate 20, the lower end of which terminates contiguous to but spaced from the inner face of the bell P the extension =29 constituting a bell tapper which is adapted to force'ably-impact the bell and thereby ring the latter as will be later-described.

Pivotally supported on the anchor plate M is an upstanding rocker plate R positioned immediately forward of the "inner end wall (1 of the anchor plate; the rocker plate R being formed-at its lower-end with spaced legs 39-30 l which pivotally seat 'in sockets SI-3| formed by indenting the upper face of the plate M; the rocker plate being held in engagement with the sockets as will be later *described. The rocker plate 'R is thus supported at its lower end for vertical swinging movement outwardly and back relative to the anchor plate-end wall q on an arcuate path of travel.

The rockerplate R embodies spaced side memhere 32 32 which'are connected together at their upper-endsby across piece 33; the sidemembers 32-32 being formed'with fingersi3'4'34 .adjacent their-upper ends with which are=connected pull springs 35- 35 connected'at their lower ends to the anchor plate 'M rearward'of the plane of h the rocker plateR; the springs 35 35 exerting a slight longitudinal pull on the rocker plate R to hold it in its seated pivotal position on the anchor plate.

"Formed'on the lower portion of the rocker plate Rand extending between the side members 32-32 thereof above thelegs tit-39 is a rearwardly inclined web 36, the upper margin 3'! of which "extends horizontally beneath and contiguous the peripheries of a pair of rollers 38 38'fiXed on a shaft SB revolubly mounted on and carried by upstanding side flanges 40-46 formed on the longitudinal margins of the plate 2a of the rocker arm L; the rollers 38 -33 forming an antifriction'bearing and rolling contact between the upper margin 31 of the web'35 and the rocker arm L.

Formed-on the weeds is a'flange 4 I projecting through the slot 2-2 in the rockenarm L and normally spaeedfrom the end wall 42 of the slot. Apush rods extends through the-bore 43 of the arbor t and has 'a *head =44 on its inner end abutting the flange l-l. A shoulderv on the head 44 abuts the arbor t" to limit outward movement of the rod S. A reset push" button 6 T is mounted on the outer end of the push rod S and is arranged in a recess 45 formed in a knob U aiiixed to the arbor t. A spring 46 bears between button T and a wall 41 of the knob yieldably holding the button T and push rod S in their outermost position.

Attached to the side flanges '48 of the rocker arm L as particularly shown 'in'Fig. 20 is a substantially u-shaped wire '5" having a bowed resilient connecting portion t extending acrossthe slot 22 in the pathof travel of the flange 4| and adapted to be placed under tension by the latter to exert athrust thereon.

The push rod S is designed to be advanced on inward pressure being applied to the reset push button T, to swing the rocker plate R forwardly and thereby elevate the rockerarm L, by the action of the web 36 on the rollers 38, to thereby lift the valve stem Z of the'valve J and open the port 0 thereof as before described; the web 36 then serving on being disposed in an upright position beneath the rollers 38 at substantially dead center of the roller axis relative to the pivotal support of the rocker plate Rat 36-30, to hold the rocker arm L in its raised position and thereby hold the valve-J in its open position, as shown in Fig. 4.

Time controlled means are provided for releasably retaining the rocker plate R. in its advanced valve opening position for a predetermined duration of time. This means is here shown as embodying a trigger like detent bar 48 which extends longitudinally through the clock housing N in the general direction of the length of the arbor 1;; the bar 48 having its rear end projecting through openings 10 formedin the back wall 25' of the clock housing and in the adjacent end wall q, and also through an opening a: in the cross piece 33 of the rocker plate R. The outer or forward end portion of the detent bar 48 extends through and is guided in a rectangular opening 1/ in the front wall 2 of the clock housing; the bar 48 normally resting on the lower edge of the opening as shown in Fig. 11. The opening 11 is slightly larger than the bar 43 to aiford a small clearance between the top and one side of thebar and the adjacent margins of the opening 31 when the bar is in the position shown in Fig. 11. The forward end of the bar 48 projects into annular space 49 formed interiorly of the knob U and opening to the back thereof.

The rear end of thebar 48 is resiliently supported by and connected to the upper portion of the rocker plate R by means of a pair of laterally extending pull springs 59-43 which lead from the opposite sides of the rear end portion of the bar 48 at spaced apart points thereon and connect with ears .5I-t5l struck from the upper marginalportion of the rocker plate R. The springs 58-50 afiord a floating suspension for the rear end of-the'bar 48; the openingsw and a: being of suflicient size that their margins will be spaced at all times from the adjacent surfaces of the bar 48 to impose the rear end of the latter solely on the springs --5fl which are tensioned sufficiently" to hold the bar in a position substantially perpendicular to the rocker plate R and to impose a lateral thrust on the bar urging its forward end toward a side'margin of the opening y against which it abutsas shown in Fig. 11; the springs Eli-59 thusbiasing the detent bar. The 'rockerplate R being 'normallyrearwardlyinclinedythebar'48 by reason of being held perpendicular thereto would normally be 7 inclined relative to the horizontal, but the opening y is located with its lower margin on a plane slightly above the normal plane of the detent bar when the rocker plate R is in its rearwardmost position shown in Fig. 3, so that the outer end portion of the detent bar will then be slightly elevated in opposition to the spring 5050 and whereby the detent bar will then abut the lower margin of the openin y under slight pressure. The forward end of the bar 38 is reduced to form a pilot pin 52 with a shoulder 53 at the base thereof arranged for engagement with the inner margin of the opening y or with the inner face of a time lug W extending adjacent the in .ner face of the clock wall a as will be later described. The time lug W comprises a sheet metal plate'carried by and affixed to the arbor t for movement therewith.

A flange 55 struck from the wall .2 projects inwardly from the upper margin of the opening 2/, the opposed side edges of which project in the orbital path of movement of the time lug W on the arbor t to limit the travel thereof in both directions; the time lug W normally being positioned to abut one edge of the flange 55 under the urge of the clock spring 3 and being adapted to be positioned by clockwise rotation of the knob U and the attached arbor t in any desired or selected position between the opposed edges of the flange 55; the lug W on being advanced relative to its initial position being subject to retrograde movement by counterclockwise manual movement of the knob U by reason of the slide clutch c.

The knob U is provided on its outer face adjacent the margins thereof with graduations 56 indicating time intervals from zero to any desired period within the range of the time required for the clock mechanism to rotate the arbor t nearly a complete revolution, such for example, as fiftyfive minutes; the graduations being calibrated accordingly and bein numerically designated as by indicia denoting five minute intervals and with graduations spaced to indicate intervals of one minute.

The device is designed to be arranged on the stove A with the knob U projecting from the front wall C thereof adjacent to the operating knob of the valve D as particularly shown in Fig. 1. A suitable index line Z is provided with which the graduations and time indicia on the knob U may be aligned in a reading position. This index line is here shown as formed on a bezel 51 carried by the clock housing.

The mechanism above described is adapted to be disposed in either of three positions; first, in an 01f position shown in Fig. 3, in which the valve J is closed and the detent bar 48 and time lug W positioned as shown in Fig. 11 and in which position the supply of gas to the burner is shut oiT; or second, in a running position as shown in full lines in Fig. 4 in which the valve J is open and gas thereby supplied to the manual control valve D with the detent bar 48 and the time lug W disposed as shown in Figs. 12 and 15, or in a third position as illustrated in Figs. l3 and 16 in which position the detent bar 48 is positioned to about the rear face of the time lug W in its retracted position as indicated-in dotted lines at a in Fig. 4, and thereby hold the valve J open to supply gas to the manual control valve D while the parts are set in the zero position as indicated by the knob U, therebyimmobilizing the time controlled unit and placing the entire control of the flow of gas to the burner 8 through the manually operable control valve D for an indefinite period of time.

In the operation of the invention, assuming'the parts to be disposed in the off position shown in Fig. 3, that is with the rocker arm L in its poised position and with the valve J closed, when it is desired to direct a supply of gas to the control valve D the reset push button T is depressed to advance the push rod S to its forwardmost position thereby swinging the rocker plate R. to its forwardmost position indicated by dotted lines 12 in Fig. 4, and thereby causing the web 36 to advance and lift the rollers 38 from the position shown in full lines in Fig. 17 to the dotted line position 6' in said Fig. 17, thus effecting upward swinging movement of the rocker arm L. This operation efiects lifting of the valve stem Z and the valve piston in opposition to the valve spring m thus opening the port 0 so as to direct gas from the manifold E through this port and through the by-pass K to the boss on the intake side of the valve D through the gland d shown in Fig. 19. Lifting of the valve stem 1 places the spring m under increased tension so that it will exert a downward pull on the rocker arm L. V

In thus operating the reset push button T, push rod S and rocker plate R, the forward movement of the upper end portion of the latter will act through the springs 55-45 to advance thedetent bar 48, until the shoulder 53 on the bar 48 will have passed through the opening 1 to a point beyond the inner face of the time lug W, whereupon the shouldered end of the bar 48 will swing laterally from the. position shown in Figs. 11 and 14 to the position shown in Figs. 13 and 16 under the urge of the springs 55-50 which are tensioned to normally urge the shouldered outer end of the bar 48 to this biased position when the rocker plate is in its advanced position. Coincident with the lateral movement of the outer shouldered end of the bar 48, upward movement thereof will be efiected by reason of the downward arcuate travel of the rocker plate R and the perpendicular relation of the bar 48 thereto, so that the bar 38 will then abut the upper margin of the opening y as shown in Fig. 12. The lateral movement of the bar 48 will be limited by the pilot pin 52 abutting the adjacent edge of the then immobilized initially positioned time lug W, while the upward movement of the bar 48 will be limited by the flange 55 against which the shouldered outer end of the bar 48 will then abut, as indicated in dotted lines in Fig. 13. The shoulder 53 of the bar d8 will then abut the outer face of the time lug W thus holding the bar 48 in its fully advanced position indicated by the dotted lines I) in Fig. 4.

Upon finger release of the reset push button T the spring 55 will restore it to normal and at the same time retract the push rod S to the limit of its rearwardmost position where the shoulder 12 thereon will abut the adjacent end of the clock arbor t as shown in Fig. 17.

The valve J will then be maintained in its open position so that gas will be directed from the manifold E and by-pass K to the manual control valve D on opening of which gas will be directed to the burner B. The flow of gas to the burner B will then be under the control of the valve D which may be manipulated to either vary the volume of gas supplied to the burner or when desired, to cut oil such supply, all at the will of the operator and entirely independent of the automatic unit H. This condition will prevail until the. automatic time controlled unit is set in operation; the unit at this state being immobilized by reason of the time lug W being disposed in its normal retracted position against the flange 55 under the urge of the clock spring 3 acting on the arbor t.

During the foregoing operation the control knob U of the time controlled unit will be disposed in the zero indicating position, wherein the time lug W is in its fully retracted immobilized position.

At any time after the depression of the reset push button T as above described and the flow of gas to the burner being effected through the then open control valve D, such flow of gas may be automatically terminated after a predetermined time interval by setting the clock control unit N in operation.

It; will now be seen that the time controlled cut-off valve, J will be initially held in its fully open position by the clock controlled lug W engaging the end of the detent bar 48 previously fully advanced by manual operation of the push rod S. In other words the valve J is initially opened, by depressing the push button T to ad- Vance the push rod S, when the clock mechanism is immobilized and the lug W is fully retracted, which operates through the rocker plate R to fully advance the detent bar 48 until its biasing spring 55! swings its outer end into a position overlying the lug W so that the latter will then hold the detent bar in its fully advanced position indefinitely. By this arrangement the stove is immediately conditioned for manual operation as though the automatic control mechanism were eliminated, but is subject to subsequent automatic shut-off on the election of the operator by then manipulating the knob U to turn the arbor t and lug W to move the latter free of the detent bar thereby setting the device for automatic shut-off. In the above operation the web 36 on the rocker plate will elevate the rocker arm L and thereby lift and hold open the valve J. in opposition to its closing spring m. By this arrangement initial movement of the clock setting knob U toward the set position moves the lug W from in front of the detent bar allowin the latter to move against the abutment afforded by the plate a where it comes to rest with the outer end portion of the greatest diameter of the detent bar then positioned in the path of travel of the lug W when it is. moved toward its immobilized position either under the action of the clock mechanism or by manual turning of the knob in a retrograde direction.

When it is desired to automatically effect cutting ofi the flow of gas to the burner at a predetermined time interval the control knob U is turned in a clockwise direction until the desired time indicating indicia 56 registers with the index Z thereby advancing the time lug W from beneath the shoulder 53 of the detent bar 48 so that the detent bar will retract and move the shoulder 53 thereon against the inner face of the clock end wall 2 at the side margin of the opening 31, thereby bringing the detent bar to rest in the position shown in Fig. 4. This retractive movement of the bar 48 is effected by rearward movement of the rocker plate R from its fully advanced position b to the full line position as indicated in Fig. 4, or from the dotted line position of to the broken line position f shown in; Fig. 17; the rearward movement of the rockerplate R being initiated under the influence of the spring which at this time has been tensioned by the flange 4! as. indicated in dotted lines in Fig. 20, sufiiciently to swing the rocker plate such distance as to move the detent bar 48 to its intermediate held position against the normally positioned lug W. The resultant movement of the rocker plate R is very slight, it being substantially on dead center as previously described thereby not materially moving the rocker arm Ia, so that the valve J will then remain fully open.

In positioning the parts as above described, elevation of the rocker arm L will retract the tapper 29 away from the bell P and dispose it in readiness for striking the bell.

Turning of the knob U clockwise to advance the time lug W rotates the clock arbor t and winds the clock spring 3 in the usual manner, which spring will act on release of the knob U to turn the arbor t and actuate the clock mechanism through the clutch c as is common in devices of this character; the arbor t being rotated in a counter-clockwise direction under the urge of spring s thereby retracting the advanced time lug W toward its initial immobilized position. The time lug in moving to such position is brought to bear against the detent bar 48 as shown in Figs. 12 and 15 and exerts a lateral thrust thereon such as to shove the shoulder 53 out or engagement with the clock end wall 2 as shown in Figs. 11 and 14 thereby releasing the detent bar and allowing the residual energy or the spring t to again initiate rearward movement of the rockor plate R toward its initial retracted position; this retractive movement of the rocker plate R from its intermediate position indicated by the broken lines 1" in Fig. 1'7 moving the upper edge 3'! of the web 36 out of vertical alignment with the axis of the shaft 38 and rollers 38 to an inclined position where the rollers will be presented to the then inclined upper face of the web 36. At this point the thrust of the then compressed valve spring m will come into play and exert a downward pull on the rocker arm L through the stern Z and head n. The load thus imposed on the rockor arm will be transmitted to the rollers 38 thereon and thence to the then inclined upper face of the downwardly moving web 38, thereby urging the rocker plate R to its fully retracted position and withdrawing the web 36 from beneath the rollers 38 and thus allow the rocker arm L to swing freely downward to its lowermost position under the urge of the valve spring m which coincidentally closes the valve J. The supply of gas to manually controlled valve D and thence to the burner will then be automatically cut ofif and the parts of the time controlled unit will be restored to the off position as shown in Fig. 3 in readiness for another operation effected on depressing the reset push button T. Coincident with closing of the valve J and the aforesaid downward movement of the arm L, the tapper 29 on the arm L will strike the bell under the velocity imparted to the rocker arm L by the downward thrust of the valve spring m thereby giving audible indication that valve J has closed and the supply of gas to the burner has been out ofi. The tapper 29 on striking the bell will rebound and the rocker arm will immediately return to its poised position under the influence of the spring 28 thus instantly losing contact with the bell after striking to allow the bell to vibrate without interference. The knob U will then be. disposed in its initial zero indicating position under the action ofthe clock spring s on the arbor t.

In setting the time control unit in operation it is not necessary to first depress the reset push button T as above described, since if desired, the knob U may be initially turned to the desired time indicating position thereby moving the time lug W away from the detent bar 48 whereupon on depressing the reset push button T, the push rod S will advance the rocker plate R, as before described, to advance the shoulder 53 on the detent bar 58 through the opening 11, whereupon on release of the reset push button the rocker plate R will move rearwardly until the shoulder 53 abuts the inner face of the clock cover plate or end wall 2 as shown in Figs. 12 and 15, instead of abutting the time lug W as previously described. The rocker plate R will then come to rest in the position indicated by the broken lines J" in Fig. 17 in which position the web 36 will maintain the rocker arm L in its elevated position such as to open the valve J and permit the flow of gas to the manual control valve D in the manner previously described, until the time lug W returns to its normal position.

It will be apparent from the foregoing that no sequential operations of the controls are necessary, and that either the reset push button T, control valve D or the knob U may be manipulated without affecting the others. It will also be manifest that the knob U on being advanced may be retracted and manipulated to vary the time set at any time and if desired may be manually restored to its initial position to cut out the time control mechanism, and obviously the manually operated control valve D may be operated by Way of regulation or cut-off of the fiow of gas to the burner irrespective of the set or non-set of the clock by the knob U.

In event it be desired, the clock controlled alarm may be utilized for any wanted purpose other than as an indication of the termination of the gas flow, since by operating the manual control valve D to shut off the gas flow to the burner and depressing the reset push button, the clock mechanism may be set to sound the alarm at any time within the range afiorded by the knob U.

It will be noted that the latched positions of the rocker plate R indicated at e and f in Fig. 17 is determined by the relative positions of the shoulder 53 on the detent bar 48 and the stops engaged thereby constituting the time lug W and the end wall a, the distance between the shoulder 53 and the connection between the bar 48 and the rocker plate and the length of travel of the upper portion of the rocker plate.

If it should be found desirable to make obligatory setting of the clock on time control before Opening the valve J by depressing the button T, this can be accomplished by merely spacin the shoulder 53 a short distance farther from the connection of the bar 48 with the rocker plate so that the latter can not be advanced sufficiently to permit the shoulder 53 to engage the time lug but suificient to allow the shoulder 53 to engage the wall a. By this arrangement it will then be necessary to advance the time lug away from the bar 48 from the position shown in Fig. 11 and depicted in dotted lines in Fig. 12 to allow the bar to swing laterally into engagement with the wall a at one side of the opening 3/.

It is to be noted that in the construction and operation of the mechanism controlling the supplemental normally closed spring pressed valve J, the rocker arm L with which the stem of the valve is engageable constitutes in effect a lever fulcrumed at one end by pivotal engagement in the slot 25 and normally held in a poised position by a yieldable longitudinal. pull impos thereon by the spring 28, and that actuation of such rocker arm to effect lifting of the piston element 7' of the valve J to open the latter and at the same time increase the tension of the valve spring m and thereby impose a down pull on the rocker arm which is efiected by advancing an inclined p ane afforded by the web 36 into engagement with the lower perimeter of the rollers 38 carried by the rocker 'arm adjacent its fulcrum point in a fashion to impose a wedge action with rolling contact against the rocker arm with an upward thrust such as to swing the arm upwardly on its fulcrum, and that the arm actuating web 35 is pivoted at a point beneath the arm substantially in vertical alignment with the axis of the roller so that on advancing the web to an upright position beneath the roller, in which the roller is seated on the upper end thereof, it will extend at least approximately in line with the center of V the roller thereby holding the arm in its elevated position, and that the roller engaging web will be held in this upright position against retraction by a trigger like detent (bar 48) acting on an upwardly extending lever (rocker plate R) integrally connected to the web and operable by a clock actuated tripping element (time lug W) to re lease the'lever (B) so as to permit its retraction initially by a thrust spring t bearing thereon, and finally by pressure imposed on the inclined plane (web 36) by the roller then bearing thereon under the urge of the valve spring acting to close the supplemental valve.

It is also to be noted that the aforesaid arm lifting action of the Web 36 as effected by the thrust of a push rod actuated by the manual depression of a push button, is by way of advance of the web toward its upright position in a direction away from the fulcrum of the rocker arm thereby progressively increasing the leverage action as the web advances, which, with the gradua ly decreasing effort required to advance the web 36 as it approaches the vertical, minimizes the Work required in pushing the button 'I and the push rod S and compensates for the resistance to opening of the valve J afforded the valve spring m, and accrues to th important result of ease of operation.

Generally considered, an important feature of the invention resides in the fact that when the time controlling mechanism is neutral or immobilized, which is during such time that the knob U is disposed in its zero position, merely pushing the push button T will place the gas supply to the burner under manual control through the usual control valve D and will remain so until the device is set for automatic time control.

While a specific embodiment of the invention has been herein shown and described it is subject to modifications without departing from its spirit and accordingly the invention embraces such changes and modifications of the parts and their arrangement and the substitution of equivalents thereof as come within the meaning and scope of the following claims.

I claim:

1. In a gas stove having a burner, a gas supply manifold and a manual control valve mounted on said'manifold having an outlet and an inlet, and connections between said outlet and burner; a supplemental valve mounted on said manifold having inlet ports opening to the interior of the manifold and having an outlet port, a by-pass connecting said outlet port to the intake of said control valve, said auxiliary valve including'a' reciprocal piston fitted with a valve stem and a spring normally urging said piston to a position closing said outlet port; an anchor plate fixed relative to said manifold having an upstanding inner end wall, a rocker arm pivoted relative to said end wall for vertical swinging movement, a spring connected to the outer end portion of said rocker arm and to said anchor plate normally holding said rocker arm in a poised position, means connecting said valve piston stem to said rocker arm, an upwardly extending rocker plate pivotally supported on said anchor plate adjacent the inner end of said rocker arm, an inclined web formed on said rocker plate extending beneath said rocker arm, a roller on said rocker arm extending below and engageable by the upper margin of said inclined web, pull spring connecting said anchor plate and the upper portion of said rocker plate normally holding the latter and the inclined web thereon in a seated position, a clock housing supported on said anchor plate end wall, a tubular arbor revolubly supported in said housing, clock mechanism within said housing including a spring for rotating said arbor in one direction, a knob on the outer end of said arbor for efiecting manual rotation thereof in opposition to said spring, a push rod extending longitudinally through said arbor having one end thereof terminating adjacent said inclined Web, an extension on said web abutting the adjacent end of said push rod, a push button on the outer end of said push rod, spring means for normally disposing said push button and push rod in a retracted position, said push rod acting on advance thereof to outwardly swing said rocker plate and inclined web to an advanced position, means on said rocker arm for limiting outward movement of said web and rocker plate, the upper edge of said web being arranged to effect elevation of said rocker arm on outward movement of said rocker plate, a detent bar extending through said clock housing substantially parallel with said arbor, springs supporting one end of said detent bar on the upper portion of said rocker plate and exerting a lateral thrust on said detent bar, a shoulder on the other end of said detent bar, said clock housing having an end wall formed with an opening through which the shouldered end portion of said bar extends, the shouldered end of which detent bar is engageable with said end wall when said rocker plate and detent bar are in an advanced position to releasably hold said rocker plate and its associated parts in an advanced position, a radially extending lug on said arbor having an outer end portion engageable with a side of said detent bar, an inturned flange on the clock housing end wall above the opening therein against which said lug is adapted to, abut to limit movement thereof in either direction on turning, said arbor, said lug being interposable between the shoulder on said detent bar and the end wall of the clock housing when the detent bar is in a fully advanced position and on movement of the lug away from the detent bar allowing the latter to move to a seated position against the clock housing end wall; and said lug on being retracted to its normal position from an advanced position being operable to release said detent bar from engagement with the clock, housing end wall thereby effecting release of the parts controlled thereby.

2. A clock controlled mechanism for shutting off the supply of. gas in a stove having a gas supply manifold, a gas burner and connections between the manifold and burner including a manually operable control valve having an inlet opening; an auxiliary valve housing arranged within said manifold having inlet ports opening to the interior of the manifold and having an outlet port, a by-pass leading from said outlet port to the inlet of said first named valve, a piston in said valve housing, a spring bearing on said piston normally positioning said piston to close said outlet port, a rocker arm, a poise spring engaged with said arm urging it to a normal poised position, connections between said arm and said piston for moving the latter to a position to open said outlet port on upward movement of said arm, a rocker plate adjacent to said rocker arm disposed in perpendicular relation thereto, an inclined web on said rocker plate having an upper edge, a roller on said arm arranged to be engaged by said inclined web and to seat on the upper edge thereof on advance of said rocker plate, a push rod having inner and outer ends arranged with the inner end thereof presented toward the back of said inclined web, means attached to said web against which the inner end of said rod may abut, a push button on the outer end of said push rod, a spring arranged to urge said push button and said push rod to a normal retracted position, a detent bar resiliently carried on said rocker plate having a shoulder on its outer end, an abutment engageable by said shoulder when said rocker plate is in an advanced position to hold said rocker plate in such position with the web thereon holding said valve piston in its port open position, a clock mechanism including a spring actuated arbor, and a radial lug on said arbor having an orbital path of travel into which the shouldered end portion of said detent bar extends; said lug being engageable with said bar to move the shoulder thereon out of engagement with said abutment on movement of said lug under the urge of said clock mechanism, to release said rocker arm from positions held by said detent oar whereby the spring in said auxiliary valve housing will move said valve piston to a closed position and coincidentally depress said rocker arm.

3. The structure called for in claim 2 togeth r with a bell, and a tapper on said rocker arm arranged to impact said bell on movement of said arm under the urge of said valve spring and to rebound therefrom under the action of said poise spring.

4. In a clock controlled mechanism for shutting off, the supply of gas to a burner, a gas supply manifold, a valve having an inlet port opening to the interior of said manifold and having an outlet port, connections between s outlet port and said burner, a clock mechanism includin a tubular arbor, a pu rod extend ing longitudinally through said arbor, a rocke plate, means engageable by said push rod arranged to advance said rocker plate on advance of said push rod, spring means yieldabiy seating said rocker plate, a spring pressed detent attached to said rocker plate, and abutmen for said detent cooperable therewith to hold said rocker plate in an advanced position, a rocker means fixed relative to said rocker plate for upwardly swinging said rocker arm on ad Vance of said rocker plate, a spring i' urging said rocker arm toward a poised position, connections between said roe-her and said valve arranged to open said valve. when said rock r arm is in an elevated position, spring means for poised position, and a time lug fixed on said clock arbor arranged to trip said detent to release said rocker plate from an advanced position.

5. The structure called for in claim 4 together with a knob fixed to said arbor having time designating indicia thereon, a push button in a recess on said knob fixed on said push rod, and a spring urging said button and push rod to a retracted position.

6. In a time controlled device for cutting on the how of gas, a gas supply manifold, a normally closed valve housing having an inlet port leading to said manifold and an outlet port leading therefrom, a spring pressed piston valve in said housing normally closing said port, a stem amxed to said piston valve, a rocker arm engageable with said stem, a spring urging said rocker arm to a poised position, a normally retracted push rod, an inclined web operable by advance of said push rod to advance and elevate said rocker arm and thereby move said piston to a position opening said outlet port, a spring pressed detent connected to said web operable to hold it in an advanced position, a clock mechanisn and a moveable lug actuated by said mechanism engageable with said detent to move it to a web releasing position; said spring pressed valve operating through said arm to retract said web on release thereof to free said rocker arm.

7. In a clock controlled mechanism, a spring pressed normally closed valve having a stem, a normally depressed vertically moveable rocker arm engageable with said stem operable on upward movement of the arm to open said valve, a normally retracted tiltable inclined web extending beneath said arm and operable on advance thereof to elevate said arm and thereby open said valve, a normally retracted push rod extending rearward of said web adapted on advance thereof to advance said web, a spring pressed detent bar connected to said web, a fixed abutment with Which said bar is engagea'ble to hold said web in an advanced position, a clock, and means actuated by said clock engageable with said detent bar to release it from said abutment and thereby permit the web, arm and valve to move to their normal positions.

8. In a time controlled mechanism including a valve having inlet ports and an outlet port, a valve element controlling said outlet port, a spring urging said valve element to its port closing position, and a stem on said element; a spring poised vertically swinging rocker arm fulcrumed at the inner end thereof, means on said stem engageable with said rocker arm on upward swinging movement thereof, an upwardly extending rocker plate pivoted at its lower end adjacent the fulcrumed end of said rocker arm, a web fixed relative to said rocker plate having an inclined plane and an upper margin, a roller carried by said rocker arm having an axis sub stantially vertically aligned with the pivoted lower end of said rocker plate with which said web will be aligned when in a vertical position with said roller imposed upon the upper margin thereof, manually operable means for advancing said web from an inclined to upright position, time controlled means connected to said rocker plate for releasably holding said rocker plate and web in an advanced rocker arm elevating position, and means for retracting said rocker plate and web on release thereof from an advanced position including said valve element urging spring; said piston to exert a downward pull on said arm and thereby exert a retractive thrust on saidgweb through said roller.

9. In a clock controlled mechanism including a normally closed spring pressed valve, a rocker plate, a pivotal support therefor on which the rocker plate is movable from a retracted to an advanced position, and means interposed between the rocker plate and said spring pressed valve for holding the latter in an open position; a detent bar having an inner end and an outer end, springs connecting the inner end of said detent bar to said rocker plate affording a floating suspension for the inner end of said bar, said springs normally positioning said bar substantially perpendicular to said rocker plate, means afiording a support for the outer end portion of said bar relative to which said bar is slidable, a shoulder on the outer end of said bar, an abutment embodied in said supporting means arranged to be engaged by said shoulder under the urge of said springs when said detent bar is in an advanced position, and clock controlled means engageable with said detent bar to disengage said shoulder from said abutment.

10. In a mechanism for controlling the flow of gas from a manifold to a burner, embodying a normally closed valve having an inlet connecting with a gas supply manifold and having an outlet port connecting with a burner; a normally inactive detent bar, manually operable means to advance said bar, means controlled by advance of said bar for opening said valve, thrust springs attached to and supporting one end of said detent bar adapted to be tensioned to exert a pressure on said bar, a fixed abutment with which said bar is engageable under pressure of said thrust springs to hold said normally closed valve releasably open, a time mechanism fixed atop said valve, a rotatable arbor embodied in said mechanism, a spring rotatably urging said arbor in one direction, a lug fixed on said arbor to turn therewith under the urge of said spring and normally disposed in an immobilized position, said detent bar extending in the path of the spring urged movement of said lug and being engageable by said lug on the spring urged orbital movement of the lug to disengage the bar from the abutment and thereby restore th normally closed valve to its closed position; said arbor urging spring being tensioned to disengage said bar inopposition to said thrust springs.

11. The structure called for in claim 10 in which the detent bar is positionable when advanced to abut said lug to hold said normally closed valve open when the lug is in its normal immobilized position.

12. In an automatic time control mechanism, a normally immobilized clock mechanism, a rocker plate, a longitudinallyreciprocal, laterally and vertically moveable detent bar, spring means yieldably connecting one end of said detent bar to said rocker plate, means loosely supporting the other end of said bar, means previously positioned by said immobilized clock mechanism holding said detent bar and its connected rocker plate in a fully advanced position, a normally closed valve, and means actuated by said rocker plate for opening said valve when said rocker plate is in its advanced position. a

13. In an automatic time control mechanism, a normally immobilized clock mechanism, .a rocker plate, a detent bar, spring means yieldably connecting one end of said bar to said rocker plate forming a resilient support for said bar end,

a plate formed with an aperture in which the other end of said bar is loosely supported for longitudinal, lateral and vertical movement, manually operable means for advancing said detent bar, and means controlled by said clock mechanism releasably holding said bar in an advanced position.

14. In a time control mechanism, an inclined rocker plate having a roller engaging margin, a rocker arm having a bell tapper extension, a bell disposed to be acted on by said tapper extension, a roller freely mounted on said rocker arm arranged to be engaged by said margin, a spring disposing said rocker plate in a retracted position, manually operable means for advancing said rocker plate to move the margin thereof into lifting engagement with said free roller on said rocker arm, a clock mechanism, detent means attached to said rocker plate releasable by said clock mechanism for retracting said rocker plate and efiecting disengagement of said rocker plate margin from said free roller, and a spring normally holding said rocker arm in a poised position adapted to move said bell tapper extension against said bell on disengagement of said rocker plate margin and roller.

15. In a time control mechanism, a controlled element, a rocker plate, a rocker arm normally detached from said rocker plate, manual control means for rocking said plate into engagement with said rocker arm to lift the latter, mean for actuating said controlled element on lifting said arm, a bell, means for ringing said bell on disengaging the said rocker plate from the said rocker arm, and spring means for restoring said rocker arm to a poised position detached from said bell and from said controlled element.

16. In a time control mechanism, a rocker arm, a roller carried by said rocker arm, a rocker plate pivoted substantially perpendicular to said rocker arm, limiting means on the rocker arm to normally position said rocker plate at approximately dead center of said roller, and resilient means carried by said rocker arm engageably by said rocker plate for initiating motion of said rocker plate off its dead center relative to said roller.

17. In a time control mechanism, a rocker arm, a roller carried by said rocker arm, a rocker plate pivoted substantially perpendicular to said rocker arm, a flange on said rocker plate, a shoulder on said rocker arm engageable by said flange to limit movement of said rocker arm in one direction relative to the rocker plate and to position said rocker plate at approximately dead center of said roller, a bowed resilient member interposed in the path of said flange adapted to be placed under tension by the latter to exert a thrust thereon and to initiate reverse motion oi. said rocker plate on dead center.

18. In a time control mechanism, a semi-selfacting controlled element, a rocker plate, a spring pressed rocker arm, manual control means for rocking said rocker plate into engagement with said rocker arm to lift the latter, means on said controlled element engageable with said arm for actuating said controlled element on lifting said arm, means for disengaging said rocker plate from the said rocker arm, and spring means for restoring the said rocker arm on disengagement of the rocker plate therefrom to a poised position detached from the controlled element to insure free self-action of the controlled element.

19. In a time control mechanism, a semi-selfacting controlled element, a rocker plate, a spring pressed rocker arm, manual control means for rocking said rocker plate into engagement with said rocker arm to hit the latter, means on said controlled element engageable with said arm for actuating said controlled element on lifting said arm, automatic means for disengaging said rocker plate Irom the said rocker arm, and spring means for restoring the said rocker arm on disengagement oi the rocker plate therefrom to a poised position detached from the controlled element to insure free self-action of the controlled element.

20. In a time control mechanism, a semi-selfacting controlled element, a rocker plate, a spring pressed rocker arm, manual control means for rocking said rocker plate into engagement with said rocker arm to lift the latter, means on said controlled element engageable with said arm for actuating said controlled element on lifting said arm, manual means for disengaging said rocker plate from the said rocker arm, and spring means for restoring the said rocker arm on disengagement of the rocker plate therefrom to a poised position detached from the controlled element to insure free self-action of the controlled element.

21. In a valve operating mechanism, a vertically moveable rocker arm, spring means urging said rocker arm toward a normal poised position, a valve, connections between said valve and said rocker arm arranged to open said valve when said rocker arm is in an elevated position, spring means for closing said valve when said rocker arm is in its normal poised position and exerting a yieldable downward pull on said rocker arm, an upwardly extending horizontally moveable spring seated rocker plate, an inclined web on said rocker plate, means on said rocker arm loosely engageable with said web and moveable with said rocker arm to elevate said rocker arm from its poised position, and manually operable means for advancing said rocker plate and inclined Web.

22. The structure called for in claim 21 in which the manually operable means comprises a horizontally reciprocal push rod having an end normally spaced from but moveable into engagement with th underside of said inclined web, and means slidably supporting said push rod; the web engaging end of said push rod and said web having relative movement on advancing the push rod thereagainst progressively increasing leverage action of said push rod on forward movement thereof.

23. In a valve control mechanism, a normally closed valve having a reciprocal stem, a rocker arm, supporting means for said rocker arm on which the arm is carried to swing between two points, means on said stem engageable by said rocker arm on swinging thereof in one direction only to open said valve, spring means holding said rocker arm in a poised position and yleldably opposing movement thereof in either direction, means for releasably holding said rocker arm in ts valve opening position, and means for actuatmg said holding means to release said rocker arm therefrom to permit movement of said arm to its normal poised position under the urge of the poising spring and also permit resultant closing of said valve.

24. The structure called for in claim 23 together with a bell, and a tapper on said rocker arm arranged to strike and recoil from said bell on spring urged movement of said rocker arm when released from the holding means.

19 II a time controlled mechanism, a nc'rmally motionless clock mechanism manually actuated means for setting said clock mechanism inmotion, alug attached to said clock mechanism to travel in one direction under the urge of said mechanism when it is in motion, manually controlled means for advancing and retracting said lug independent of said clock mechanism, a moveable detent bar disposed in the path of travel of said lug when the latter is moving from an advanced to a retracted position, spring means normally disposing said detent bar in a retracted position, manually operable means for moving said detent bar to anadvanced position, a fixed abutment engageable by said detent for releasably holding said detent bar in its advanced position, a control mechanism, and connections stwe nsa dd t n ar nd Said o r me anism adapted to hold said control mechanism active when said bar is in its advanced position againsts'aid abutment and to hold said control mechanism inactive when said bar is in its retracted position; said lug being engageable with said detent bar to release it from said fixedabutment on retrograde movement of said lug to its normal position, w

26. The structure called for in claim 25 in which said lug is adapted to be interposed between said detent bar and fixed abutment to hold said detent bar in its advanced position independent of said fixedabutment.

27. In a time controlled mechanism, a control mechanism, a detent bar normally disposed in a retracted position, connections between said bar and said control mechanism holding the latter inactive when the bar-is in a retracted position and holding the control mechanism active when the bar is in its advanced position, manually operable means for movingsaid detent bar to its advanced position, a normally immobilized time mechanism, a lug attached to said time mechanism adapted to travel under the urge of said mechanism when it is in motion and adapted to be moved forward and back from a normal position independent of said mechanism, lug en-.

gaging means on said detent arran ed to abut said lugwhen in its normal position to hold said detent in its normally advanced position hrouahcut u h time, s sai l ck mechanism immobilized adapted to bereleased from said lug; on initial advance thereof, a;fixed:-abutment arianged toengage, said detent to hold it-in an advanced position when said lug engaging means is disengaged from the lug, said detent when enga'gedby said fixed abutment being positioned in the backward path of travel of Said 111g, and said detent being disengageable from said fixed abutment by said lug to then be retracted to its normal position.

28. In a time controlled mechanism, a laterally and longitudinally spring pressed 'detent bar, mechanism controlled by said detent bar, push rod means for manually advancing said detent bar, time mechanism having a rotatable arbor, a lug-abutment affixed to a'ndturnable withsaid arbor and positioned by said arbor to be abutted by said detent bar to hold the bar in an advanced position for an indefinite time when said time mechanism becomes self immobilized and adapted to be moved'to free said bar, and'a fixed abutment arranged to be abutted by said bar on its being freed from said lug-abutment adapted to hold the detent bar in an advanced position for subsequent release by movement of said lugabutment under the urge of said time mechanism.

29. In a timecontrol mechanism, a detent bar, spring means exerting a longitudinal thrust on said bar, manually operable means for advancing said bar in opposition to said spring means, a normally closed spring pressed Valve'having a stem, means engageable with said stem controlled by said detent bar 'for disposing said-valvei'n its open position when said bar is in an advanced position, a lug fixed on said arbor and moveable therewith against which said bar. abuts e'ndv'vise when the-lug is in a retracted position and when said bar is in an advanced position, said lug being adapted to be moved out of abutting engagement with said bar to permit spring urged lohgi-tu dinal movement thereofto apositio'n in the path of travel of said lug fromfanadvancedto -its retracted position, and a fixed abutment against which said bar abuts endwise when initially moved out of engagement with saidlug to then hold the bar in another advanced po'si'tion and from which said bar isadapted to'be 'movedby said lug on retrograde movement thereof to free said bar for spring pressed movement, to its normal retractedposition to allow saidvalve-to close.

HUGH MCDOWELL.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS.

Couzens Apr. 6, 1943

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