US2158685A - Back draft vent for ranges - Google Patents

Description

May 16, 1939. J, w BARKER 2,158,685-

BACK DRAFT VENT FOR RANGES Filed Feb. 10, 1938 2 Sheets-Sheet l May 16, 1939'. J, w. BARKER I BACK DRAFT VENT FOR RANGES 2 Sheets-Sheet 2 r I I 36g) 6,

Filed Feb. 10, 1958 g "IHH Patented May 16, 1939 UNITED STATES PATENT OFFiCE 6 Claims.

This invention relates to a damper or venting device for stoves or ranges and the like and more particularly combination ranges in which both gas and solid fuel is employed.

The principal object of the present invention is to provide a damper for stove oven and broiler compartments which is automatically operated by an attachment from a gas cock and wherein means provided to prevent back pressure of gases within the said oven or broiler compartment.

A further object is the provision of a damper adapted to be positioned within the smoke bag or hump at the rear of the stove and having means associated therewith which will open with the damper to provide relief in the event of back draft.

These and other objects and advantages will be apparent as the specification is considered in connection with the accompanying drawings, in which:

Figure 1 is a rear view of the damper frame and damper in assembled position partially with in the smoke bag, with the damper in closed position;

Figure 2 is an enlarged section on the line 2-2 of Figure 1;

Figure 3 is an enlarged rear view of the damper frame with the damper and damper door in open position; and

Figure 4 is a section on the line 44 of Figure 2.

Referring more particularly to the drawings, wherein like reference characters designate similar parts throughout the several views, numeral l designates the rear wall of a combination range oven 2. The oven is heated in the conventional manner, either by products of combustion passing around it from a combustion chamber or fire pot, not shown, or by the heat from a gas burner, not shown, located within or beneath the oven. The products of combustion from the fire pot, after circulating around the oven, pass beneath the oven and are discharged outwardly through suitable openings, also not shown, into the lower end of a vertically arranged main discharge flue or smoke bag 3, of conventional construction, suitably secured to the rear wall of the range, whereby the flue gases are caused to pass upwardly therethrough and thence into the atmosphere.

Vents or openings 4 are provided in the rear wall 9 of the oven, at the upper end thereof, for permitting the flue gases within the oven to escape into the smoke bag 3. A substantially rectangular damper frame 5 is positioned within the smoke bag and is attached to the oven wall l, approximately over the vents 4 therein, by means of screws or the like 5. One end of the damper frame extends outwardly through a side wall 6 of the smoke bag, which. extended end is provided with a bulged casing or housing portion 1, which vents into the room through an open outer end 3. The frame 5 is formed with a relatively narrow flange 9, extending around the periphery thereof, which is recessed or undercut at its inner end to provide a groove or channel Ill. An inwardly extending flange l2, formed on the upper and lower edges of a substantially rectangular, relatively thin plate or damper i l, fits within the groove it and permits the damper to be slidably actuated within the frame, as hereinafter described. Openings it in the damper plate coincide with the oven discharge openings 4 for controlling the passage of oven gases or products of combustion from the oven directly to the smoke bag 3.

a A frame M is positioned over the open end 8 of the damper frame casing portion l and is removably secured thereto by means of a nutted screw or bolt 95, which extends through a slotted lug It on the side of the casing. A flapper door l! is pivotally attached to lugs it on the upper end of frame M by bolts or the like it, whereby the casing opening 8 may be closed or opened, as will presently be described. The outer end of the damper plate I! is reduced to form a handle 20 which slidably extends through a recess or cutout portion 2| in the frame M. A lever 22 is pivotally connected at one end to a stud 23 on the end of the damper handle 2i? and at its other end to a rack lever, not shown, which in turn is suitably connected to a gas cock, not shown, whereby rotation of the gas cock to on and off positions will actuate the slide damper in a well known manner, to open and closed positions respectively.

The damper handle 29 is provided with a lug or fin 24, adjacent its inner end, and a lug or fin 25 is also formed on the rear face of the door ll, to one side and adjacent the upper end thereof. The lugs 2d and 25 are so positioned that, when the gas is turned on to supply the oven burner, and upon the consequent outward sliding movement of the slide damper II, the lug 24 is caused to abut the door lug 25 and thereby push the said door outwardly or ajar, to the open position shown in Figure 3 and in which position the openings l3 in the damper are in register with the vent openings 4 in the rear wall of the oven, thus opening the damper. Upon a reverse movement of the damper the openings 4 and I3 will be out of register and the door I! will be moved to closed position by gravity.

It will thus be seen that when the gas cock handle has been turned to off position, the slide damper II, as shown in Figures 1 and 2, covers and closes the discharge openings 4 in the oven wall and the flapper door I1, at the outer end of the damper casing I, is closed to the atmosphere. Rotation of the gas cock handle to on position causes the damper plate I l to be moved outwardly in which position, the damper openings l3 coincide with the discharge openings 4 in the oven wall and the flapper door I! is moved to open or ajar position, as shown in Figure 3.

When the slide damper and flapper door are in the open position described above, the flue gases generated by the gas burner within the oven are permitted to pass outwardly through the damper openings into the main discharge flue or smoke bag from whence they pass upwardly to the atmosphere.

It is well known in the art that a back draft in the smoke bag or oven results in the gases passing down the bag and back into the oven where they mingle with the gases within the oven and often cause an explosion. Circulation of necessary fresh air is also thus cut off from the burner. By virtue of the present construction, the flapper door is in open position throughout the entire venting operation of the oven and therefore any back draft of flue gases will cause the downwardly travelling gases to pass laterally and outwardly through the open flapper door into the atmosphere of the room instead of passing through the damper openings and back into the oven, with the aforementioned deleterious results.

Thus it will be seen that the operation of the damper is entirely automatic and that in addition to venting the oven in an improved manner, an efficient and very satisfactory means for preventing back draft of gases within the oven is provided.

While a preferred embodiment of my damper has been shown and described it is to be understood that various modifications in the design and construction may be made without departing from the scope and spirit of the appended claims. Should it be desired, the damper may also be operated manually by disconnecting the lever 22 and gas cook connecting levers from the damper handle, in which case the slide damper may be moved to open and closed position by hand, or other means.

Having thus described my invention what I claim is:

1. In a dual range, a main discharge flue, a compartment having vents opening into said flue, a frame in said flue having a sliding damper means movable therein for controlling said vents, a vent on one end of said frame communicating with the flue and the atmosphere for venting back flue gases, and pivoted means for closing said vent, and means for simultaneously actuating said pivot means and said damper.

2. In a range, a main discharge flue, an oven having vents opening into said flue, a frame extending into and supported in said flue, a damper slidably positioned in said frame for controlling said vents, and a vent on one end of said frame and means for closing said vent for venting back draft gases from said flue directly to the atmosphere, and means for simultaneously actuating said means and said damper.

3. In a range, a main discharge flue, an oven having vents opening into said flue, damper supporting means in said flue and extending through the wall of said flue, a damper slidably positioned in said supporting means and having a portion thereof extending through the wall of said flue, a vent in the outer end of said damper supporting means communicating with the flue and with the atmosphere for venting back draft gases from the flue direct to the atmosphere and a pivoted door member for opening and closing the vent, and means for simultaneously actuating said pivoted door and said damper.

4. In a range, a main discharge flue, an oven having vents opening into said flue, a frame positioned in said flue and extending through one side thereof, a damper slidably positioned in said frame and having one end extending through the side of said flue, a vent on said frame in communication at opposite ends with said flue and the atmosphere for venting back draft gases directly to the atmosphere, and a pivoted door member on the extended end of said frame for closing said vent, and means for simultaneously actuating said means and said damper.

5. In a dual range, a discharge flue, an oven having vents opening into said flue, a damper for controlling said vents, a chamber communicating at one side with said flue, and having an opening for venting into the room in which the stove is being operated, means for closing said opening and means for simultaneously actuating said first mentioned means and damper.

6. In a dual range, a discharge flue, an oven having vents opening into said flue, a damper for controlling said vents, a back draft chamber communicating with said flue, said chamber having an opening venting directly into the room in which the range is being operated, a door for said opening operable by gravity to closed position, and means for simultaneously opening said door and damper.

JESSE W. BARKER.

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