US1350575A - Selective actuating mechanism - Google Patents

Description

R. B. SMITH.

SELECTIVE ACTUATING MECHANISM.

APPLICATION FILED Aue.2I. I916. RENEWED Nov 17.1919.

1,350,575 Patented. Aug. 24, 1920.

2 SHEETS-SHEET I.

R. D. SMITH.

SELECTIVE ACTUATING MECHANISM.

APPLICATION FILED AUG.ZI, I916. RENEWED NOV. 17.1919.

1 ,350,575. Patented Aug. 24, 1920. i

2 SHEETS-SHEET Z.

UNITED STATES PATENT OFFICE.

RAYMOND D. SMITH, OF MILTON, MASSACHUSETTS, ASSIGNOR TO TREMONT PRODUCTS COMPANY, OF BOSTON, MASSACHUSETTS, A COR PORATION OF MASSACHUSETTS.

I SELECTIVE ACTUATING MECHANISM.

Specification of Letters Patent.

Patented A11 24, 1920.

Application filed August 21, 1916, SerialNo. 116,099. Renewed November 17, 1919. Serial No. 338,674.

To all who/a it may concern Be it known that I, RAYMOND D. SMITH, a citizen of the United States, residing at Milton, in the county of Suffolk and State of Massachusetts, have invented certain new and useful Improvements in Selective Actuating Mechanism, of which the following is a specification.

My invention relates to actuating means for a rotative, reciprocative control device or element (such as, for example, a rotary valve member) wherein by reciprocative rotation through a limited number of degrees,

- the device (or valve member) effects appropriate controlof some ultimate means (6. g. opens or closes valve ports) as desired. With such devices or elements it is sometimes desired to have free movement in both directions through a portlon, only, of the entire travel, and at other times to cause, at will,

a further movement in one direction, and

to have movement in the reverse direction thereafter effected automatically; for which purpose means are provided whereby the device or element is maintained by a stop or detent against such movement in said reverse direction, and whereby tension is established to cause such movement auto matically after a desired time interval; the

stop, or detent, being then automatically retracted.

It is convenlent to combine the device or element and the automatic actuating means,

with simple, oscillatory control extensions (which may be concentrically and adjacently pivoted for purposes of compactness,

and suitably interrelated) whereby desired operation of the element or device in both directions is primarily secured or governed. In such an arrangement I have found it advantageous to provide external of the mechanism, for convenient manual actuation thereof, a plurallty of cords, chains or other extension members appropriately;

guided or interconnected at their ends so as to plainly indicate, by their positional relation, the rotative position of said control device or element. One of such cords or chains (to wit: that cord adapted by suitable actuation thereof to cause said further movement of the control device or element whereby I use, it will be obvious that, when so used, a

of special nature and independent in operation of'the other cords or chains, so that said free partialmovement of the control device may be had independent of said special cord.

The particular embodiment of my invention herein chosen for illustrative purposes only is adapted for use with illuminating gas burners; and, although the scope of my invention is by no means confined to such specific object thereof is to provide simple, and preferably reciprocating, manual control means for the valve governing the supply of gas to such burner;wherehy said valve may be opened and closed by the usual reciprocative actuation of conventional control means and whereby, further, suitable actuation of associated additional control means may put said valve under control of automatic means for causing a delayed closure.

Other details and objects of my invention will appear from the drawings, description and claims hereof.

In the drawings: Figure 1 is a front view of a structurally combined open flame gas burner and controlling valve therefor, together with mechanism for actuating said valve, in which mechanism is embodied one form of my presentinvention, the casing for the mechanism being omitted, and parts shown in position to permit normal operation of the main burnergFig. 2 is a view in elevation looking at the right of Fig. 1, with the mechanism casing broken away; Fig. 3 is an enlarged partial section taken on the vertical plane 33 in Fig. 2, showing the arrangement of operative valve ports and their relation when the illuminating burner is extinguished; Fig. 4 is a section similar to Fig. 3, but showing the relation of ports during normal operation of the illuminating burner;-.Fig. 5' shows therelation of ports after manual actuation adapted to cause delayed automatic closure of the valve; Fig. 6 is an enlarged plan view of the valve actuating mechanism taken partly in section on the horizontal plane 6 6 in Fig, 8; Fig. 7 is an enlarged front view of the mechanism shown in Fig. 1, the parts being shown in their positions after manual actuation adapted to cause delayed automatic closure of the valve; Fig, 8 shows a position of parts dur-j front view of the modified mechanism shownin Fig. 9, the parts being shown positioned similarly to the corresponding parts in Fig. 1; Fig. 13 is diagrammatic and indicates a different operative position of the control arrangement shown in Fig. 10; Fig. 14, also diagrammatic, indicates a still different position of this control arrangement.

Throughout the drawings and in the following description, similar parts are designated by like numerals.

. In Fig. 1, the flame of the main burner appears at 10. The usual burner stem 11 is shown mounted upon a valve block 12, which block contains the usual tapered valve plug 15 lying horizontally transverse of the upright main gas passage 18, and adapted, in the usual manner by rotation,- to govern the supply of gas to the burner. The valve plug 15 has a stem 30 extending forwardly and axially from its smaller end, and carrying fixed thereto, two opposite radial arms 34 and 35. v

The arm 23% carries, pivoted thereto, a bell crank check lever 26 normally maintained by a spring 411 against a rearwardly projecting stop 51 on the arm 34 and positioned, as shown in Figs. 1 and 8 to rcleasably engage with a stationary abutment 54 and to thereby limit the clock vvise swing of the radial arm 34- to substantially a horizontal position. A control cord 65 is shown attached to the end of arm 34.

The arm 35 carries pivoted to its end a bell crank latch (36, suitably limited in its movement and yieldingly held in a position by the spring 73 such that a forwardly bent end 67 of the latch may be .releasa-bly engaged by a dog arm 78, which dog arm forms one of three, operative, radial extensions of a dog member 36. The dog member 36 is loosely mounted on the valve stem 30, and is retained thereon by a screw 42 in the end of the latter. Such engagement oi the latch 66 by the dog arm 78, as shown in Figs. 7 and 8, enables the dog arm, upon suitable actuation thereof, to positively rotate the arm 35 in a. counter-clockwise direction in Fig. 7; but release from such engagement may be had, at will, by a downward pull upon the cord 68 which act-nation as indicated by broken lines in Fig. 1, first disengages the latch 66, from the dog arm 78 and then may act to positively swing the arm 35 clockwise in Fig. 1, independent of the dog member 36.

The dog member 36 has diametrically opposite the dog arm 78, a trip arm 27, with a rearward extension .37 near its end, adapted upon clockwise rotation of the dog member 36, to first engage the check lever 26 to swing the upper end of same inwardly and out oi engagement with the abutment .545, after which the extension 37 may positively engage the arm to swing the latter in a clockwise direction to its position shown in Fig. 7. A spring 38 is loosely coiled around the hub of dog member 36 and is connected thereto and to a post 29 extending forwardly from the supporting plate 31, to normally maintain the dog member positioned as in Fig. 1 where the trip arm 27 is held in contact with the post 29.

A grooved drum segment 39 is carried by the dog member 36 and guides a third control cord 6-1 which latter is made fast to the dog member by a pin 63. The cord 6&1 extends downwardly through a guiding bellmouth 62 and affords convenient means for manually rotating the dog member in a clockwise direction against the action of the spring 38, when desired. v

The dog member 36 carries at the extremity of a thirc extension 45, there. (which extension is axially separated from the arms 27 and 78 by a connecting hub) a yoked latch member e16, pivoted thereto and arranged to yield in only a counter-cloekwise direction in Fig. 7, against the tension of the small coiled spring 48.

Lying normally in the path of movement of the latch member 4:6 is a spur shaped detent 52, carried fast to the inner surface of a curved, bi-Inetallic thermostat 53, which latter is securely anchored by one end to a projecting abutment 54, extending lorwardly from the upright, circular supporting plate 31. This supporting plate is mounted rigidly on the valve block 12 and carries a stationary roller abutment 61. internally adjacent to the free end of the thermostat and adapted to reinforce the latter against excessive flexural yielding when said thermostat subjected to the thrust imparted by pressure of the latch member 16 upon the spur detent as shown in Fig. 7. The thermostat is arranged to open, or straighten, upon being thermally energized, which movement it will be plain, retracts the detent 52 radially outwardly and away from the path-3t movement of the latch member 46.

Clamped to the mounted end of the thermostat and extending rearwardly from the same, is a mono-metallic, heat conducting member which terminates as shown in Figs. ,1 and 2 in a hollow, hooded, or inverted, cup-shaped portion 57, adjacent to the burner stem 11 and external of the mechanism housing. This terminal hood has a small opening 58 at its top and is entirely open at the bottom.

Directly under and slightly below this terminal portion of the heat conducting member 56, the fuel outlet of a small auxiliary heating burner 21, structurally integral with the valve block 12, and of Bunsen burner construction with means therein for regulating the supply of gas thereto. As shown in Fig. 5, the valve plug 15 has an additional port 19 adapted to register, in suitable rotative position of the former, with a corresponding port 20 in the valve block, which latter port leads to the burner 21. Gas may thus be delivered to the burner 21 under control of the valve plug 15, whereupon such gas will rise and ignite from the heat of the main flame 10, subsequently burning at the mouth of the burner 21 with a hot blue flame from which heat may be transmitted to the thermostat by the heat conducting member 56. A casing 33, is provided to house the mechanism.

T 0. keep the control cords properly spaced and positioned and to increase the convenience of their manipulation I may interconnect them in some suitable way, preferably near their terminals, as shown in Figs. 1 and 2. Here the cords and 68 are shown provided at their ends with vertical links 69 carrying the ball terminals 70 and a rigid cross bar 71 loosely pivoted at each end to one of these links.

A similar link 72 terminates the cord 64 but is slotted to permit free vertical movement thereof independent of the cords 65 and 68 and to be guided in such movement by engagement with a stud 74 on the cross bar 71, being thus maintained properly spaced and separated from the other cords.

It will be evident, also, after further consideration of the operation of this device, that this arrangement of operatively independent, but constructionally associated, controlling cord terminals offers a true indication in all positions, of the positional relation of the mechanical parts (which themselves are inclosed) and thereby of the condition and position of the'controlled device.

Having thus described the construction of one form of a particular and useful application of my present invention, I shall now explain the operation thereof, assuming the parts to be positioned as shown by broken lines in Fig. 1 where the valve ports are related as shown in Fig. 3 and no gas is supplied to either the main or auxiliary burners, which therefor are inactive. When it be desired to light the illuminating burner the cord 68 is pulled downwardly, causing, in the previously described manner, a movement of the arm 35 and thereby of the valve plug 15 to a position such for instance as shown by full lines in Figs. 1 and 4 where it will be clear that gas is delivered to the illuminating burner only, which burner may then be lighted and remain in operation for an indefinite period of time. It will be clear that further pull upon the cord'65 will be opposed by the check lever 26, but that the arms 34 and 35 are entirely free for movement in either direction between the positions thereof, shown by broken and by full lines in Fig. 1; and therefore, that by manipulation of the cords 65 and 68 in the conventional manner, complete control of the valve may be had from a fully closed to a fully open position, independent of other mechanism present.

When, however, it be desired to elfect delayed automatic closure of the valve (from whatever position the valve may occupy between its limits of movement as shown in Figs. 3 and 4), cord 64 may be pulled downwardly, which will cause clockwise rotation of the dog member against the tension of spring 38. During this rotation, as shown in Fig. 8, the end of dog arm 78 will latch under the end 67 of the latch 66 before the trip arm 27 contacts with the check lever 26 to disengage the latter from the obstructing abutment 54 and thereby to release the arms 34 and 85 for further clockwise movement of the valve.

Continued pull upon the cord 64 will then rotate both dog member 36 and the arms 34 and 35 to the broken line position of dog member shown in Fig. 7. Upon release of cord 64, the dog member will be rotated in the reverse direction by the tension in spring 38 until intercepted by engagement of its latch member 46 with the spur detent 52 whereupon the parts will be held in the position shown in Fig. 7, where the valve ports are related as shown in Fig. 5 and where, it will be clear, that gas is delivered to the auxiliary heating burner 21. This burner now ignites from the flame 10 as heretofore explained and acts to heat the thermostat. Upon being thus heated, the thermostat straightens or bends generally outwardly, assuming after a certain time interval the position indicated by broken lines in Fig. 7, wherein the detent 52 has been retracted and the dog member 36 being thus released, is rotatively impelled by the spring 38 to its original position against its stop post 29 as shown in Fig. 1, carrying with it the arm 35 and thereby returning the valve to its closed position as shown in Fig. 3, where all gas supply to both the main and auxiliary burners has been stopped and such burners consequently extinguished. It will be evident that the arm 35 will now remain in this oil position until subsequent actuation to open the valve, a separate stop post 7 9 being provided to prevent further movement of said arm in a counter-clockwise direction.

In Figs. 9, 10 and 12, I have shown. another possible, and equally simple, arrangement of means for convenient manual control of the valve acting mechanism. Here it will be evident that the mechanism is similar to that shown in the ireceding figures, except that a radial arm replaces the grooved drum segment 39, and carries at its end, pivoted thereto by means oi a flat link 76, the dog member actuating chain 6st, which chain replaces and has the same function as the cord 64, in the preceding figure. The arm 75 extends in a direction generally similar to that of the valve arm 35 and is of such length that the chain 6% han s substantially adjacent to the chain (38. I have shown attached to the end of chain 64, a double, tubular terminal 77 through one portion of which the control chain 63 may freely slide. The other control chain 65 is terminated and connected to chain 68 in the manner of the corresponding cord construction in Figs. 1 and 2, both said chains being loosely pivoted at their point of connection to the mechanism arms.

Fig. 10 clearly shows the above described construction and the position of chains and terminals as viewed independent of the valve actuating mechanism, indicating that means have been energized and made active to cause a delayed extinguishment of the light, and indicating a position of the valve ports as in'Fig. 5. Fig. 13, shows diagrammatically, the position of this external controlling arrangement after automatic extinguishment of the light, or when the valve is closed as indicated in Fig. 3. Fig. A indicates the positionot' these parts when the valve is fully open and the burner adapted for normal operation for an indefinite period of time.

In Fig. 11, l have shown a detail of construction of a combined pivot and spring stud, the use of which in a device of this kind is especially advantageous, because of its compactness, its ease of production, and its durability. The pivot is formed by an eyelet 80, fixedly riveted to the check lever 26 and having a loose bearing in the arm 34, in which bearing it is retained by the eyelet head 81. The hollow center of the eyelet is utilized for tightly mounting therein a spring stud 82, having a thin head 83 which loosely retains the wire spring 41, carried thereunder. Other details of construction and advantageous arrangement of parts for yielding compactness, durability and simplicity will be apparent from the drawings.

It will be evident to those skilled in the art, that the particular embodiment of my invention disclosed herein is but one of many possible applications of the principles and spirit thereof, such means of accomplishing such multiple functions by simple, selective and associated control means, being advantageous to diverse mechanism entirely foreign to the control of gas flow. -V'Vithout therefore, limiting the scope of my invention to the precise embodiment herein disclosed, what I claim as new is 1. ln combination with a rotary device adapted for limited reciprocative movement; a. member pivoted concentrically with said device and arranged cooperatively for driving engagement with same, said member and said device being disengageable to permit independent reciprocation of said device relative to said member when the latter is in its normal position; a resilient connection tending to impel said member to its said normal position thereby to actuate said de vice; and releasable latch detent means normally arranged to catch and hold said member displaced from its said normal position and tensioned by said resilient connection.

2. Actuating means for a rotary device adapted for reciprocative movement, embodying, in combination with said device; releasable means normally arranged to check full movement of said device in one direction; normally inactive means, operably in dependent of said device, andadapted upon movement independent thereof in said direction to be operatively connected to said device; actuating instrumentalities for said normally inactive means, arranged to be energized by movement thereoi in said direc tion and thereafter operatively to move said last mentioned means in the reverse direction; means governed by said normally inactive means and arranged upon continued movement oi said last mentioned means in said first direction, torelease and positively to move said device in said first direction; and a releasable detent normally arranged and positioned to hold said device near the extreme of its travel in the said first direction, against movement in said reverse direction.

3. Actuating means for a rotary device adapted for reciprocative movement, em-

bodying. in combination with said device; releasable means normally arranged to check full movement of sait device in one direction; normally inactive means, operably independent of said device, and adapted, upon movement independent thereof in said direction, to be operatively connected to said device; actuating instrumentalities for said normally i active means arranged to be energized by movement thereof in said direction and thereafter operatively to move said last mentioned means in the reverse direction; means governed by said normally inactive means and arranged upon continued movement of said last mentioned means in said first direction, to release and positively to move said device in said first direction; and a releasable detent normally arranged and positioned to ill) hold said device, near the extreme of its travel in the first said direction, against movement in said reverse direction; together With automatic means cperatively controlled by movement of said normally inactive means in said first direction and adapted to cause a releasing movement of said detent.

l. Aetuating means for a rotary device adapted for reciprocative movement embodying, in combination with said device;'oppositely disposed radial arms rigidly fixed to said device and adapted for limited, oscillatory movement; a movable stop extension carried by one of said arms and normally positioned to check full movement of said device in one direction; a latch member car'- ried by the other of said arms, forming an actuating extension therefor; an oscillatory dog member, concentrically pivoted with the said device and arranged to be normally inactive and operably independent thereof, the said dog member having a radially ex tending portion adapted upon rotation of the dog member in said direction to automatically effect engagement thereof with said latch member, whereby rotation of said dog member in the reverse direction may cause similar rotation of the said device, and having an oppositely extending trigger arm arranged upon further movement of the dog member in said first'direction to trip said stop extension and thereby to release said device for further movement in the said first direction, said trigger arm having positive,uni-directional engagement with the first said device arm for causing such further movement of the device; and a releasable detent, normally arranged and positioned to catch and hold said device, near the extreme of its travel in the first said direction, against movement in said reverse direction.

5. Actuating means for a rotary device adapted for reciprocative movement embodying, in combination with said device; oppositely disposed radial arms rigidly fixed to said device and adapted for limited, oscillatory movement; a movable stop extension carried by one of said arms and normally positioned to check full movement of said device in one direction; a latch member carried by the other of said arms, forming an actuating extension therefor; an oscillatory dog member, concentrically pivotedwith the said device and arranged to be normallyiir.

active and operably independent thereof, the said dog member having a radially extending portion adapted upon rotationof the dog member in said direction to automatically efl'ect engagement thereof with said latch member, whereby rotation of said dog memher in the reverse direction may cause similar rotation of the said device, and having an oppositely extending triggerlarm arranged upon further movement of the dog member in said first direction to trip said stop extension and thereby to release said device for further movement in said first direction, said trigger arm having positive, uni-directional engagement with the first said device arm for causing such further movement of the device; and tensioned resilient means arranged normally to maintain said dog member in a definite absolute position at its extreme of travel in said reverse direction and to yieldingly resist move ment of said dog member in said first direction.

6. r'kctuating means for a rotary device adapted for reciprocative movement embodying, in combination with said device; oppositely disposed radial arms rigidly fixed to said device and adapted for limited'oscillatory movement; a movable stop extension carried by one of said'arms and normally positioned to check full movement of said device in one direction; a latch member carried by the other of said arms, forming an actuating extension therefor; an oscillatory dog member, concentrically pivoted with the said device and arranged to be normally inactive and operably independent thereof, the said dog member having a radially extending portion adapted, upon rotation of the dog member in said direction, to automatically effect engagement thereof with said latch member whereby rotation of said dog member in the reverse direction may cause similar rotation of the said device, and having an oppositely extending trigger arm arranged upon further movement of the dog member in said first direction to trip said stop extension and thereby to release said device for further movement in the said first direction, said trigger arm having positive, uni-directional engagement with the first said device arm for causing such further movement of the device; tensioned resilient means arranged normally to maintain said dog member in a definite absolute position at its extreme of travel in said reverse direction and to yieldingly resist movement of said dog member in said first direction; a releasable detent, normally arranged and positionedto catch and hold said device near the extreme of its travel in thefirst said direction against movement in said reverse direction; and automatic means controlled by movement of said do member to the said extreme of its travel in said first direction, and adapted to cause release of said dog member from said detent.

7. Actuating means for a reciprocative device arranged for free, limited, reversing movement, embodying, in combination with said device, oppositely extending radial arms therefor; a fixed stop to limit movement thereof in one direction, and releasable stop means to limit movement thereof in the opposite direction and including a tensioned dog pivoted on one of said arms of said device; a concentrically pivoted device arranged for independent reciprocative move ment, having means positively limiting movement thereoi in said first mentioned direction and tensioned against said movement in said opposite direction; means, including a second, tensioned, pivoted dog on said first mentioned device, to latch said two devices together for movement in said first mentioned direction, and upon movement of said second mentioned device in said opposite direction; means controlled by said second mentioned device arranged to re leasably move said first mentioned dog upon continuous movement of said second mentioned device in said opposite direction, said two devices being provided with an interlocking formation whereby continued movement of said second mentioned device imparts movement in the same direction to said first mentioned device; releasable detent means, including a member carried by said second mentioned device and arranged to restrain movement of said second men tioned device and the carried first mentioned device in said first mentioned direction, while permitting engaging movement between the detent members in the opposite direction; and devices controlled by the movement of said second mentioned device in said opposite direction and adapted to cause the delayed disengagement of said detent means.

8. Actuating .means for a reciprocative device arranged for free, limited, reversing movement, embodying, in combination with the said device oppositely extending radial arms therefor; a fixed stop to limit move ment thereof in one direction, and releasable stop means to limit movement thereof in the opposite direction and including a tensioned dog pivoted on one of said arms of said device; a concentrically pivoted device arranged for independent, reciprocative movement, having means positively limiting movement thereof in said first mentioned direction and tensioned against movement in said opposite direction; means, including a second tensioned pivoted dog on said first mentioned device, to latch said two devices together for movement in said first mentioned direction; and upon movement of said second mentioned device in said opposite direction; means controlled by said second mentioned device arranged to releasably move said first men tioned dog upon continuous movement of said second mentioned device in said opposite direction, said two devices being provided with an interlocking formation whereby continued movement of said second mentioned device imparts movement in the same direction to said first mentioned device; releasable detent means, including a member carried by said second mentioned device and arranged to restrain movement of said second mentioned device and the carried first mentioned device in said first mentioned direction, while permitting engaging movement between the detent members in the opposite direction; and devices controlled by the movement of said second mentioned device in said opposite direction and adapted to cause the delayed disengagement of said detent means;said second pivoted dog on said first mentioned device being adapted to be readily actuated to disengage the two devices and permit independent movement of said first mentioned device in either direction.

9. actuating means for a reciprocative device arranged for free, limited, reversing movement, embodying, in combination with said device, oppositely extending radial arms therefor; a fixed stop to limit movement thereof in one direction, and releasable stop means to limit'movement thereof in the opposite direction and including a tensioned dog pivoted on one of said arms of said de vice; a concentrically pivoted device arranged for independent, reciprocative, movement, having means positively limiting movement thereof in said first mentioned direction and tensioned against movement in said opposite direction; means, including a second tensioned pivoted dog on said first mentioned device, to latch the two devices.

together for movement in said first mentioned direction, and upon movement of said second mentioned device in said opposite eirection; means controlled by said second mentioned device arranged to releasably move said first mentioned dog upon continuous movement of said second mentioned device in said opposite direction, said two devices being provided with an interlocking "formation whereby continued movement of said second mentioned device imparts movement in the same direction to said first mentioned device; releasable detent means, including a member carried by said second mentioned device and arranged to restrain movement of said second mentioned device and the carried first mentioned device in said first mentioned direction, while permitting engaging movement between the detent members in the opposite direction; and devices controlled by the movement of said second mentioned device in said opposite direction, including a thermostat and means for thermally energizing the same; said pivoted dog on said first mentioned device being adapted to be readily actuated to disengage the two devices and permit independent movement of said first mentioned device in'said opposite direction.

10. In combination with a rotary device adapted for limited reciprocative movement; opposite radial extensions fixedly carried by the device for actuating the same; a member pivoted concentrically with said device and normally maintained in a definite, absolute position by resilient means, and adapted when so positioned to permit independent, reciprocative rotation of the said device, the said member being formed and positioned coiiperatively with a latch arrangement carried partly by one of said radial device ex tensions to automatically engage with said latch arrangement, thereby to impel the said device in a direction toward said absolute position of said member when said member is moved from such position against the action of said resilient means and released; control means suspended one from the end of each radial extension, interconnected near their lower ends, and adapted to cause oscillation of the said device by alternate, unidirectional pulls thereon; together with an independent control means connected to said member and arranged to be operatively independent of the first said control means but structurally associated therewith and guided thereby, and adapted upon actuation thereof to rotate said member from its said absolute position.

11. Tension-actuated, valve controlling mechanism, embodying, in combination with a valve stem, an actuating member rotatably mounted thereon and spring-impelled in one direction to a stop-limited rotative position; a detent to hold said member under tension of said spring at an opposite extreme rotative position; and means tor releasable driving engagement between an extension of said valve stem and said member, whereby said stem is rotatively impelled by said member in a valve-closing direction, said means being actuatable to tree said stem from said driving engagement so that said stem is adjustable independently of, and relative to, said member when the latter is in its said. stop limited. position.

12. In combination; a burner; a burner valve; a valveactnating member upon the stem of the VtlVQ; a spring tending to move said member in the direction of rotation of said valve to a closed position; a fixed eXtension carried by the valve stem; means for releasable engagement between said extension and said member whereby said movement of said extension closes said valve automatially to extinguish the burner; and a separate valve control device operatively related to said means and. adapted to disengage said extension from said member, whereby said valve may be operatively adjusted inclependently of said member to regulate said burner for continuous operation.

13. In combination; an oscillatory device; oositive stops to limit the full oscillatory movement thereof; a releasable stop normally operative to limit the oscillation of said device to less t run its said full movement; an actuator member movable relatively to said device and arranged for positive driving engagement therewith in one direction of oscillation, and "for releasable driving engagement therewith in the other direction of oscillation whereby said device is also operable independently of, and relatively to, said member; a spring tending to rotate said member in said other direction of oscillation; means whereby rotation of said member in said first direction o1 oscillation trees sait device from said releasable stop to permit "full movement of said device; and an automatic detent normally arranged to catch and hold said member when the latter is tensioned by said spring and in driving engagement with said device, thereby to govern automatic actuation oi the latter.

14. A gas valve control apparatus em-.

bodying, in combination; a gas port control element rotatable between normal limits oi movement; an actuator member for said element adapted to impel the latter beyond its said normal limits; separate control means for said element whereby the latter may be established independently of said member in certain port governing positions within its said normal limits of movement; a separate control extension for said actuator member whereby the latter may be moved to impel said element to a designed position beyond its said normal limits; mechanism adapted automatically to return said element from its said designed position; and normally inactive, slow-acting instrumentalities, adapted to render said mechanism operative a substantial interval of time after said instrumentalities are energized; together with means whereby movement of said member to its said designed position energizes said instrumentalities.

Signed. in Boston, Massachusetts, this 19th day of August, 1916.

RAYMOND D. SMITH. Witnesses:

J. E. BLAGKMAN, JAMES D. GORDON.

Images