US2076395A - Oil burner control - Google Patents

Description

April 6, 1937.

P. s. ARNOLD QIL BURNER CONTROL Filed May 15, 1936 ffz,

INVENTOR.

A TTORNEY.

Patented Apr. 6, 1937 UNITED STATES PATENT OFFICE 6 Claims.

This invention relates to oil burner controls and the object of the invention is to provide a pneumatic control for use in connection with a compressed air operated oil burner which is started by closing all escape passages and allowing pressure to beibuilt up in the system by a constant output air pump and stopped by opening an escape passage and allowing the pressure to drop.

Another object of the invention is to provide a thermostat arranged to operate a mechanism whereby the air passages may be controlled so that when the air passages are opened the pressure is allowed to drop to shut ofi the burner and when the air passages are closed the pressure is allowed to'build up to start the burner.

A further object of the invention is to provide a device which is entirely automatic in operation as governed by the room temperature and requires no manual re-setting.

Another object of the invention is to provide a lever which when turned to one position will open the escape valve and when turned to the other position will close the escape valve, the movement of the lever being controlled by the thermostat in combination with the air pressure of the system.

1 These objects and the several novel features of the invention are hereinafter more fully described and claimed and the preferred form of construction by which these objects are attained is shown in the accompanying drawing in which Fig. 1 shows the device in operating position with the pressure built up. Fig. 2 shows the device in non-operating posi- --::3 tion with the escape valve open.

Fig. 3 is an enlarged view taken on line 33 of Fig. 2.

The device comprises a casing I having vent apertures 2 shown in Figs. 1 and 2. A circular 4 member 3 is secured to the bottom of the casing by "the bolt 4 and this member 3 is provided with an upwardly extending lug 5 at one side to which the coiled thermostatic element 6 is secured. At the upper end this element 6 is secured to a mem- 45 her I which is connected to a pinion 8 rotatably ll of the lugs [8 as shown in Fig. 3.

(Cl. 236-87) i A cylinder I9 is provided at one side of the casing l and a piston 23 is slidably mounted in the cylinder and is provided with an upwardly extending portion 2|. A coiled spring '22 is positioned about the portion 2| and at one end engages against the top of the cylinder and at the opposite end engages against the piston 20.

This cylinder l9 at the bottom is provided with an air inlet opening 23 through which air-may enter the cylinder from the air conduit 24. The conduit 23 is provided with a vent aperture 25 which may be closed by the valve 26 and when the valve 23 isopened the air may escape through the escape passage 21 into the interior of the casing l which is vented to atmosphere by the apertures 2.

A rod 28 is connected to the piston in the cylinder l9 and extends through the top of the cyl-. inder. This rod 28 extends through a guide bracket 29 and is provided with collars 30 and 3| secured to the upper end thereof. A lever 32 is pivotally, mounted at 33 on the bracket 34 and the end of this lever is slotted or provided with an elongatedaperture through which the rod 28 extends. The lever 32 beneath the pivot 33 is provided with an inturned foot 35 and this foot is arranged to engage the pawls 36 or 31 when the lever 32 is turned to the two positions shown in Figs. 1 and 2. A spring 38 is connected to the end of lever 32 and to abracket 39 and thisspring tends to pull this lever 32 to a neutral position. The pawls 36 and 3! are each provided with a notch in the end thereofadapted to engage over the upturned lugs at the opposite ends of the member l2. The rod 28 is provided with a collar 43 thereon having an extending arm provided with-a pin 4| riding in the slot 42 of a pivoted arm 43 which is pivotally connected to the bracket 44. Intermediate the ends of the arm 43 is a link 45 which is pivotally connected thereto and at the lower end is pivotally connected to a bracket 43 having a spring 5| therein. The valve release lever 47 is pivotally mounted on a bracket 48 and is pivotally connected to the link 49 which in turn is connected to the valve 26.

In the position shown in Fig. 1 the valve 2'5 closes the escape aperture 25 so that the air passing into the cylinder has raised the piston until the portion 2| has engaged the top of the cylinder. In Fig. 1 the parts are in position assumed during operation of the burner. As the temperature of the room rises the thermostatic element 6 turns the gear 8 in a clockwise direction, viewed from the top, thus moving the rack Hi to the right of Fig. 1 and turning the member l2 on the pivot l3 to raise the right end of said member. This raises the fiat spring member l6 above the upper end of the lever 41 and the spring through the bracket 46 turns this lever to the left of Fig. l to open the valve 26 as shown in 5 Fig. 2. As the end of the member I5 is raised above the end of the lever 41, this lever 41 may move between the ends l1 of the lugs 18 shown in Fig. 3 and to the left of Fig. 1 until the end of the lever engages beneath the flat spring end 10 I5 which will be raised by the end of the lever until the lever passes out from under the flat spring end l5, at which time, it will engage against said flat spring end l5 as shown in Fig. 2. The opening of the valve 25 allows the air pressure to escape through the apertures 25 and 21 and as the air pressure is reduced in the cylinder IS the spring 22 forces the piston downwardly. This downward movement of the piston lowers the collar 40 and arm 43 and the link 45 turns the bracket 4'5 to the position shown in Fig. 2 thus placing a tension on the lever 41 and tending to move it to the right of Fig. 2.

However, this lever cannot move to the right due to its engagement against the end of the 25 spring trigger l5. Also during downward movement of the rod 28 the collar 3| engages the end of the lever 32 and turns it on the pivot 33 until the shoe 35 lifts the pawl 35 to the position shown in Fig. 2. The control mechanism is then in position for subsequent operation with the burner shut off.

As the room cools down, the gear 8 is rotated in a counter-clockwise direction by the thermostat thus moving the rack Ill to the left of Fig. 2 which raises the left end of the member l2 until the member I5 is lifted above the upper end of the lever 41. At this time the spring 5| acting through the bracket 46 turns the lever 41 to the right of Fig. 2 so that the upper end thereof passes under the fiat spring 16 to the position shown in Fig. 1. This movement of the lever 41 closes the valve 26 so that the air pressure passes through the passageway 23 into the cylinder I9 and raises the piston 20 to the position shown in Fig. 1 against the tension of the spring 22. During this movement, the collar 40 is raised to raise the lever 43 and link 45 to place a tension on the lever 41 to throw it to the left of Fig. 1. Also, the collar 30 in moving upwardly moves the shoe 35 so that the notch in the pawl 36 may engage the left end of the member l2 and as the piston reaches the top of its stroke the shoe 35 lifts the pawl 31 off from the right hand end of the member l2 so that the control is again ready for another operation. The pawls 36 and 31 prevent" the trigger member 12 from releasing the lever 41 until the spring 5| has been given tension enough so that it will force the lever 41 through its entire stroke when released.

The temperature at which the thermostat will operate may be varied by loosening the nut 52 on the bolt 4 and turning the disc 3 to vary the position of the lug 5 radially about the bolt 4. By this adjustment the thermostat may be set to operate the control at the desired temperature. Though not here shown, the conduit 24 is supplied with air under pressure by a constant output air pump which maintains a continuous air supply.

From the foregoing description it becomes evident that the device is very simple and efficient in operation, will automatically control an oil burner by opening or closing the air escape, may be adjusted for various temperatures and provides a device which accomplishes the objects described.

Having thus fully described my invention, its utility and mode of operation, what I claim and desire to secure by Letters Patent of the United States is 1. An oil burner control comprising a perforated casing, a cylinder mounted in the casing, an air conduit opening into the bottom of the cylinder, a vent valve for the air conduit, a lever pivotally mounted in the casing and turnable to one position to close the vent valve and. turnable to another position to open the vent valve, a trigger pivotally mounted adjacent the free end of the lever and turnable on its pivot to move one end or the other of the trigger into the path of travel of the lever, a thermostat connected to turn the trigger on its pivot, a piston movable upwardly in the cylinder by air pressure, a spring tending to move the piston downwardly in the cylinder, means connected to the piston for applying pressure to turn the lever in one direction as the piston moves upwardly, said means being arranged for applying pressure to turn the lever in the other direction as the piston is moved downwardly in the cylinder, a pair of pawls-pivotally mounted in the casing and arranged to engage the ends of the trigger to prevent movement of the trigger on its pivot and means connected to the piston for raising one pawl as the piston reaches the top of its stroke and for raising the other pawl as the pistonreaches the bottom of its stroke.

2. An oil burner control comprising a perforated casing, a cylinder mounted in the casing, an air conduit opening into the bottom of the cylinder, a vent valve for the air conduit, a lever pivotally mounted in the casing and turnable to one position to close the vent valve and turnable to another position to open the vent valve, atrigger pivotally mounted adjacent the free end of the lever and turnable on its pivot to move one end or the other of the trigger into the path of travel of the lever, a thermostat connected to turn the trigger on its pivot, a piston movable upwardly in the cylinder by air pressure, a spring tending to move the piston downwardly in the cylinder, means connected to the piston for ap plying pressure to turn the lever in one direction as the piston moves upwardly, said means being arranged for applying pressure to turn the lever in the other direction as the piston is moved downwardly in the cylinder.

3. An oil burner control comprising a perforated casing, a thermostat within the casing, a pinion turnable by the thermostat, a rack meshing with the pinion, a pivoted trigger movable by the rack, a cylinder in the casing, an air inlet into the cylinder, an air vent for the airinlet, a valve for closing the air vent, a pivoted lever arranged in one position to close the valve and in the opposite position to open the valve, said lever normally engaging one end or the other of the pivoted trigger, spring means for turning the lever on its pivot, a piston slidably mounted in the cylinder and movable upwardly by air pressure within the cylinder, a spring tending to move the piston downwardly and means operated by the piston for applying pressure to said lever on one side or the other of its pivot;

4. An oil burner control comprising a perforated casing, a cylinder mounted in the casing, an air conduit opening into the bottom of the cylinder, a vent valve for the air conduit, a lever pivotally mounted in the casing and turnable to one position to close the vent valve and turnable to another position to open the vent valve, a trigger pivotally mounted adjacent the free end of.

the lever and turnable on its pivot to move one end or the other of the trigger into the path of travel of the lever, a thermostat connected to turn the trigger on its pivot, a piston movable upwardly in the cylinder by air pressure, a spring tending to move the piston downwardly in the cylinder and means connected to the piston for applying pressure to the lever at one side or the other of its pivot.

5. An oil burner control comprising a perforated casing, a cylinder in the casing, an air conduit opening into the bottom of the cylinder, a vent valve for the air conduit, a lever pivotally mounted in the casing and turnable to one position to close the vent valve and turnable to another position to open the vent valve, a trigger pivotally mounted adjacent the free end of the lever and turnable on its pivot to move one end or the other of the trigger into the path of travel of the 20 lever, a thermostat connected to turn the trigger on its pivot, spring means for turning the lever in either direction, a piston in the cylinder and means connected to the piston to control the application of the spring means to move the lever in one direction or the other.

6. An oil burner control comprising a perforated casing, an air conduit, a vent valve for the air conduit, a lever pivotally mounted in the'casing and turnable to one position to close the vent valve and to another position to open the vent valve, spring means arranged for turning the lever on its pivot, a trigger pivotally mounted adjacent one end of the lever and turnable on its pivot to move one end or the other of the trigger into path of travel of the lever, a thermostat connected to turn the trigger on its pivot, spring means applicable to the lever on one side or the other of its pivot to turn the same in one direction or the other and pneumatically operated means for controlling the application of the spring means to the lever.

PHILIP S. ARNOLD.

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