US1614798A - Safety-fuel supply for drying and enameling ovens - Google Patents

Description

Jan. 18, 1927. 1,614,798

A. MAEHLER SAFETY FUEL SUPPLY FOR DRYING' AND ENAMELING OVENS Filed August 5; 1926 N' N l? .g El @33- R la A f "D S INVENToR:

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A TTORNE Y.

Patented Jan. 18, 1927.

, `UNITED STATES AB'JPIEITJ'IR' MAEHLER, 0F CHICAGO, ILLINOIS.

SAFETY-FUEL SUPPLY FOR DRYING .AN D ENAMELING OVENS.

Application illed August 5, 1926. Serial No. 127,279.

This invention relates to that type of drying and enameling ovens in which heat emplo ed in the operation of the oven is furnislied by burners of the gaseous fuel type, and more especially to that form of the same in which the burners are incased to provide indirect heating units within the oven chamber with said units having means for a separate discharge of the products of combustion to the outer atmosphere. And the present im rovement has for its various objects:

il'o provide intercontrolling means between the control valve in the fuel supply pipe to the burner of the heater, and the like control valve in the fuel supply pipe to the pilot light burner, whereby the said valves are positively held against either anopening or a closing movement except -in proper order or sequence, the purpose being to prevent an accidental 'or other escape of unconsumed vgaseous fuel into the oven chamber and a liability of the explosion of such gaseous fuel in said chamber and the consequent damage to the oven structure and surrounding objects.

A further object is to provide in connection with the intercontrolled means above referred to, of an electric spark ignitionmeans, and wherein the operating means of a switch controlling the electric circuit of said ignition cans is operatively connected with the operating meansof the pilot light valve, so that the openingl and the closing movements of said pilot light valve will effect a corresponding closing and-openin of the circuit of Csaid switch mechanism, a1 as will hereinafter morev fully appear.

In the accompanying drawing:

Fig. 1 is a side elevation showing the preferred form of the safety controlling means applied to a drying and enameling oven, the oven structure being shown in section. t

Fig. 2, is a detail front elevation, with the parts shown in a position in which the burner valve is in a closed condition and locked against rotation and 'in which the pilot light valve is also in a closed condition ready for an o ening movement. v

Fig. 3, is a etail top view, with the parts in the position set forth in connection with 2. ike reference numerals indica@ like parts -1n 'the several views, f

The oven structure may be of the usual rectangular form, with its indirect heating units arranged adjacent to the side walls of the chamber of the oven, as described in detail in a companion application for Letters Patent, Serial No. 127,276.

In the construction shown in Fig. 1, the casing 1 of the indirect heating unit is arranged in a lower corner portion of the oven` chamber, and contains the horizontally arranged tubular burner 2 formed with the usual longitudinal series of jet orifices. The forward end of the tubular burner 2 extends out through a front plate 3 fixed on the front wall of the oven structure for attachment to the usual fuel and air mixing head 4, and the gaseous fuel supply pipe 5 in which is arranged a shut-off valve 6.

In operative relation to the tubular burner ,2 aforesaid, the. pilot light is arranged with said pilot light comprising a horlzontally arranged tubular member 7 formed with the usual longitudinal series of jet openings. The forward end of said tubular member 7 also passes out through the front plate 3 aforesaid and has connection with a gaseous fuel supply pipe 8 in which is arranged a shut-off valve 9.

In operative. relation to the aforesaid tubular member 7 vof the pilot light, an electric ignition means, usually a spark gap plug 10,'passes through an orifice in the aforesaid front plate 3, with its electric supply line provided with av controlling switchxll.

In connection with a burner system such as above described, the present invention involves an inter-'controlling connection beween the movable members thereof, as folowsz- The shut-olf valves 6 and 9 ,of the fuel supply pi es 6 and 8, are arranged in adja` cent relation, one to the other, and with the respective movable members 6 and 9 in right-.angle relation one to the other and with said valve members -carrying fixed circular disks 12 and 13 in like right-angle relation with their perimeterof one disk intersecting the perimeter of the other disk with a view t'o an interlocking engagement of said disks as hereinafter described.

Individual notches 14 and 15 are formed in the rimeters of the disks l2 and 13,

:with said notches positioned in relation l loo one to the other that with the notch of one off valve'9, with said projection so positioned disk aligned with the perimeter of the companion disk, the perimeter of said companion .disk is free to move in the notch of the first mentioned disk in a closing or opening of the fuel supply valve with which the last mentioned disk constitutes a part.

In the described movement or shift of the last mentioned disk its perimeter has direct engagement in the notch of the first mentiQned disk to prevent any movement of the same and an opening or closing movement of the fuel shut-off valve of which it constitutes a part.

In the practical use of the construction above described and in the initial portion of its operation, the shut-off valves 6 and 9 in the fuel supply pipes 5 and 8 are in a closed condition with the perimeter of the disk 13 of the pilot light shut-off valve 9 in locking engagement with the notch 14 of thedisk 12 of the burner shut-off valve 6, to hold the same in its closed condition.

With a turning movement of the aforesaid disk 13, in attaining and opening of the shutoff valve'9 and a supply of gaseous fuel to t-he pilot light burner 7, the notch 15 in said disk 13 is brought into alignment with the perimeter of the disk 12, to release the above mentioned locking engagement and admit' of the disk 12 being turned by its operating handle to attain an opening of the shut-0E valve 6 and a supply of gaseous fuel to the tubular burner 2. And in this last mentioned movement of the disk 12, its perimeter moves into a locking position in the notch 15 of the disk 13 of the pilot light shut-olf valve 9, to prevent a closing of such shut-off valve 9, until the burner valve 6 and associated parts are returned to the closed condition first described.

Wit-h the described interconnection of the shut-0H valves and their operativo connections, the pilot light must be first started before gaseous fuel can bo supplied to the heating burner, andthe pilot light supply of fuel cannot be shut-off until the fue supply to the heating burner has been. first shut off. r

Another part of this invention involves an automatic control connection between the operating mechanism of tho pilot light shut-off valve 9 vand the make and break switch 11 of the electric supply line to the ignition means or spark plug l0, aforesaid, to attain an aetion of said spark plug 10 simultaneous with the opening of tho pilot light sup ly valve 9, an to such end a connection o parts is provided, as follows A bell-crank lever 16 is pivoted on n convenient stationary part of the structure. with one of its arms in operative contact with the stem of the movable member of the make and break switch 11 aforesaid, and with its other end arranged in the path of a cam light shutthat in an opening movement of the valve 9, the cam projection 17 will operate the bell crank 16 and the movable member of the switch 11 to close the circuit of said switch and supply electro-motive force to the ignition means or spark plug 10, aforesaid.

Having thus full described my invention, what I claim and dyesire to secure by Letters Patent, is p l. In a control system for gaseous fuel heating means, the combination of a burner, a pilot light, separate supply pipes to said burner and pilot light, shut-oli' valves arranged in sa1d supply pipes, circular disks /having positive operative connection with the movable members of said valves, said disks being arranged in right-angle relation to each other with their erimeters in intersecting relation, each dis having a peripheral notch for alternating locking engagement with the perimeter of the other disk.

. 2. In a control system for gaseous fuel heating means, the combination of a burner, a pilot light, separate supply pipes to said burner. and pilot li ht, shut-off valves arranged in said supply pipes, circular disks, having fixed attachment to the movable members ofvsaid valves, said disks being arranged in right angle relation to each other with their perimeters y in intersecting relation, each disk having a peripheral notch for alternating locking engagement with the perimeter of the other disk..

3. Ina control system for gaseous fuel heating means, the combination of a burner, a pilot light, an ignition spark plug, separate supply pipes to said burner and pilot light, shut-oit1 valves in said supply pipes, an electric supply line connected to said spark plug and provided with a switch, circular disks having positive operative connections with the movable members of said valves, said disks being arranged in right angle relation to each other with their perimeters in intersecting relation, each vdisk having a peripheral notch for alternate locking engagement with the perimeter of the other disk with the disk associated with the pilot light shut-ofi' valve carrying a cam projection, and operative connections between said cam projection and the movable. connections between said cam projection and the movable member of the aforesaid switch in the supply line to the spark plug.

4. In a control system for gaseous fuel heating menus` the combination of a burner, n. pilot light, an ignition spark plug, separate supplyl ipes to said burner and light, suit-o valves in said supply pipes, an electric supply line connecte to .said spark lug and provided with a switch, circular isks having fixed attachment to the movable members of said valves, said disks being arranged in right-angle relation to so y.

llil) ilot each-other with their eters in intersecttion and the movable member of the aforeing relation, each di having a peripheral said switch in the supply line to the spark notch for alternate locking e l vgement 'yvith plug. l0

the perimeter of the other 'sk, with the Signed at Chicago,v Illinois, July, 1926.

disk associated with the pilot light shut-0E valve carrying a cam pro]ection, and operat ARTHUR MAEHLER, tive connections between said cam projec-

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