US3051158A - Ventilating system for a cooking oven or the like - Google Patents

Description

Aug. 28, 1962 w. R. KIMBERLEY VENTILATING SYSTEM FOR A COOKING OVEN OR THE LIKE Filed Nov. 5. 1960 4 Sheets-Sheet 1 4 rrofinas ya.

Aug. 28, 1962 w. R. KIMBERLEY 3,051,158

VENTILATING SYSTEM FOR A COOKING OVEN OR THE LIKE Filed Nov. 5, 1960 4 Sheets-Sheet 4 FIG; 4-

. 1/ 7: I '22 t 4 I l I l i 176 45 M E I I I! l f I I, Q l I X 5: 2 as? .l i 5 40, r i T 4 I 2 a E M a? i q'T' I I! fi 1 I x if 1 v i 18 Y j 1b 16 IN V EN TOR. flhlfzrfifimfierlqy United This invention relates to a ventilating system for a cooking oven or the like.

The chief aim of my invention is to provide a simple and reliable oven ventilating system by means of which vapors from the chamber of an oven may be channeled directly to a flue for evacuation under natural draft conditions or may be conducted into the flue by mechanically induced forced draft, as may be desired or deemed necessary during use of the oven.

It is a further object of.my invention to provide a ventilating system for cooking ovens whereby the door of the cooking chamber may remain closed during the broiling or roasting of foods therein.

A further object of my invention is to provide a ventilating system for cooking ovens and the like having a natural draft ventilating system and a forced draft ventilating system, wherein either of said systems may be operated selectively, and wherein operation of the forced draft system automatically closes olf the natural draft system.

Briefly described, the ventilating system of my invention comprises a duct which is in communication with the cooking chamber of the oven and in communication, through an opening, with the fiue; a damper for said opening normally biased to open position to permit vapor evacuation under natural draft conditions; a by-pass extending from the duct and connecting into the flue beyond the opening aforesaid in the duct; and a blower fan interposed in the by-pass and operative, when started, to force the damper into closed position over the opening in the duct so that the oven vapors will be vacuated under'forced draft via said by-pass into the flue.

Other objects and attendant advantages will appear from the following detailed description of the attached drawings, wherein:

FIG. 1 is a broken out perspective view of an oven embodying the ventilating system of my invention;

FIG. 2 is a side elevation of the oven drawn to a larger scale with the upper portion thereof in vertical section, and showing the ventilating system in operation under normal natural flue draft conditions;

FIG. 3 is a fragmentary view corresponding to FIG. 2 showing the ventilating system in operation under forced draft;

FIG. 4 is a staggered horizontal section, with areas partially broken away, taken as indicated by the angled arrows IVIV in FIG. 3;

FIG. 5 is a fragmentary detailed section taken as indicated by angled arrows V-V in FIG. 2; and

FIG. 6 is perspective view of the damper.

The cooking oven herein illustrated for convenience of exemplifying my invention is of a type adapted to be set into a recess in the wall of a building, the same having a rectangular casing 10 of sheet metal with side walls 11 and 12, a back wall 13, a top 14 and a bottom 15. At a level spaced somewhat below the top 14, the interior of the casing 10 is divided by a horizontal partition 16, and the space below said partition is subdivided by a horizontal diaphragm 17 (FIG. 2) into' an upper or cooking chamber 18 and a lower chamber 19, said chambers having frontal access doors 20 and 21 which are hinged along their bottom edges, respectively, as

Patent at 22 and 23 so as to be swingable downwardly to open position.

The door of the upper or cooking chamber is of usual construction and is recessed as at 24 along the rear of its top edge. Extending crosswise of the space 25 between the casing top 14 and the partition 16 at the front of the casing is a front wall 26 having in the lower portion thereof a transverse opening 27 into which a filter 28 is set. Wall 26 extends somewhat below said partition 16 and is offset rearwardly as at door frame 29 in complementary spaced relation to the recess 24 along the top edge of the door 20 with consequent provision of a narrow interval 34) for escape of vapors from the upper chamber 18 when door 20 is closed. As further shown, the top edge of the door 20 is overreached by a hollow deflecting hood 31 which is open to the atmosphere at the bottom and suitably aflixed transversely of the front of the casing. Above the hood 3-1 is a control panel 76 on which are mounted a gas off-on and temperature control 71, a bank of switches 72, and a timer 7'3.

Disposed in the space 25 is element 35 which, as shown in FIGS. 1 and 4, has spaced side walls 36, 37, a transverse back wall 38 and a top wall '39. The element 35 is fixedly secured to the partition 16 by means of screws 40 whereof the shanks are passed through outwardly directed flanges along the bottom edges of the walls 36, 37 and '38, and threadedly engage into said partition. As a result of this construction, there is provided in the space 25 immediately above the partition 16 a horizontal duct 41 which extends rearwardly from the front of the casing 10 substantially throughout the depth of the same. Duct 41 is in communication with the atmosphere through filter 28 and the hollow of hood 31.

Adjacent its rear end wall 38, the top 39 of the element 35 is provided with an opening 42 and, somewhat forward of said opening, with a second opening 43. Superv posed upon the element 35 within the space 25 and over the opening 42 is an inverted, hollow, box-like element 44-, which is made fast by screws 45- (FIG. 1), and provided, in turn, with an opening 46 in its top, the latter opening being flanged as at 47 for connection of a flue pipe 48 (FIG. 3). Pivoted at 49 with the box-like element 44 and adapted to close down over the opening 4 2 is a damper 50 (which is separately illustrated in 'FIG. 6), and which is provided with a counterweighted arm 51 whereby it is normally biased to open position, as shown in full lines FIGS. 2 and 5, and in broken lines in FIG. 3. The box-like element 44 also has a lateral opening 52 which, through a by-pass fitting 55, is in communication with the opening 43 in the top of the element 35. From FIGS. 1 and 4 it will be noted that the by-pass fitting 55 has a lateral substantially circular, hollow offset 56 which is occupied by a rotary blower fan 57 arranged to be driven by an electric motor 58. When blower fan 57 is in operation, its discharge pressure is sufiicient to close damper 50 against its counterweight. Thus, natural draft ventilation is shut off when forced draft ventilation is used.

The horizontal partition 16, which comprises the top wall of the upper or cooking chamber 18 of the oven, is provided with an opening 60, thus placing duct 41 in direct communication with chamber 13. Shiftable over the opening 60 is a plate 61 (FIG. 4) whereof the lefthand portion is solid and the right hand portion is formed with an aperture 62 spanned by a filter screen 63. The plate 61 is afixed to a lever 64 which is fulcrumed about a stud 65 set into partition 16 immediately behind the filter screen .28. Lever 64 extends outwardly beneath 0 screen 28 and terminates within the hood 6 1. At its ID 67 constrained to slide within a horizontal slot 68 in the front of the hood 31 (FIGS. 1, 4).

Operation To prepare the oven for baking, the plate 61 is moved to the position in which it is shown in FIG. 4, to bring the solid portion thereof over the opening 60 in the partition 16 to close off chamber 18 from duct 41. The blower fan 57 need not be used, unless it is desired to cool the outside of door 20 by drawing air through hood 3 1, filter 28 and duct 41 to fiue 48. Under these conditions, as the baking proceeds, only a small portion of the vapors within the oven chamber are withdrawn, via the passage 30, over the top of the door 20, and through hood 3 1, filter 2 8 and the duct 31, wherefrom they escape into the flue 43 via either opening 42 or opening 43, depending on whether fan 57 is in operation.

When the oven is to be used for broiling or roasting, the plate 61 is shifted to bring its screened aperture 62 into position over the opening 60 in the partition 16, placing chamber 18 in communication with duct 41. Preferably, the blower 57 now is utilized. Upon starting the blower 57, the blast therefrom acts upon the damper 50 and forces it to closed position over the opening 4-2 at the inner end of the duct 40, in which position said damper remains so long as blower 57 is in operation. Under these conditions, the vapors are drawn out of the oven chamber 18 by forced draft, through the filter screen 63 over the opening 60 the by-pass 55, from which they continue into the box-like element 44 for discharge into the flue 43. Thus with the ventilating system of this invention, it is possible to broil or roast foods with the door 20 of the oven chamber 18 closed.

While in accordance with the provisions of the statutes, I have illustrated and described the best forms of embodiment of my invention now known to me, it will be apparent to those skilled in the art that changes may be made in the form of the apparatus described without departing from the spirit and scope of the invention as set forth in the appended claims, and that in some cases certain features of my invention may be used to advantage without a corresponding use of other features.

Having thus described my invention, I claim:

1. In a domestic cooking appliance, the combination comprising an oven, and a ventilating system for said oven, said oven including walls providing a compartment, a door closing said compartment, there being a substantially wide opening extending across the top of said closed door and placing the interior of said compartment in communication with atmosphere, said venting system including a first duct extending fore and aft over said compartment and having an open end at the front of said compartment, an upwardly extending flue communicating with the aft end of said first duct, said oven walls including a horizontally extending top wall having a portion thereof serving as the bottom wall of said first duct, said horizontally extending wall portion having a broil opening formed therein, a horizontally extending hood coextensive in length with the top of said door and overhanging the open end of said first duct,

a control panel for said oven positioned above said hood, said substantially wide opening being in communication with atmosphere at substantially the level of said horizontally extending wall, a damper at the outlet from said first duct normally biased open, means operable for controlling said broil vent opening, a second duct connected between said first duct and fine and bypassing said damper, and a fan disposed within said second duct and operable for closing said damper against the influence of said bias, said compartment being vented to the interior of said first duct principally via said broil vent when the same is open and being vented to the interior of said first duct via said opening over the closed door, said hood and said open end of the first duct when said broil vent is closed, said first duct being vented to atmosphere via said flue by natural draft when said fan is off and via said bypass duct and flue when said fan is on.

2. In a domestic cooking appliance, the combination comprising an oven, and a ventilating system for said oven, said oven including walls providing a compartment, at door closing said compartment, there being a substantially wide opening extending across the top of said closed door and placing the interior of said compartment in communication with atmosphere, said venting system including a duct extending fore and aft over said compartment and having an open end at the front of said compartment, an upwardly extending flue communicating with an aft end portion of said duct, said oven walls including a horizontally extending top wall portion serving as the bottom wall of said first duct, said horizontally extending wall portion having a broil opening formed therein, a horizontally extending hood coextensive in length with the top of said door and overhanging the open end of said first duct, a control panel for said oven positioned above said hood, said substantially wide opening being in communication with atmosphere at substantially the level of said horizontally extending wall, means operable for controlling said broil vent opening, and a fan operable for inducing a draft in said flue, said compartment being vented to the interior of said duct principally via said broil vent when the same is open and being vented to the interior of said duct via said opening over the closed door, said hood and said open end of the duct when said broil vent is closed, said duct being vented to atmosphere via said flue by natural draft when said fan is off and by forced draft when said fan is on.

References (Iited in the file of this patent UNITED STATES PATENTS 567,025 Ferris Sept. 1, 1896 980,471 Zenke Jan. 3, 1911 1,678,730 Johnson July 31, 1928 2,102,352 Bilde Dec. 14, 1937 2,167,047 Jackson et al July 25, 1939 2,622,582 Pollock Dec. 23, 1952 2,836,114 Weaver et a1 May 27, 1958 2,889,825 Evans June 9, 1959

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