US1788644A - Closed top for gas stoves - Google Patents

Description

Jan. 13, 1931. A. H. TINNERMAN 1,788,644

CLOSED TOP FOR GAS STOVES Filed May e, 1929 4 Sheets- Sheet 1 FIE...L

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Jan. 13, 1931. A. H. TINNERMAN 1,738,644

' CLOSED TOP FOR GAS STOVES Filed May 6. 1929 4 Sheets-Sheet 3 F IELB gmicnkoz if/wffim F I 5.,5 $7M Jan. 13, 1931. A. H. TINNERMAN 1,788,644

CLOSED TOP FOR GAS STOVES Filed May 6, 1929 4 Sheets-Sheet 4 F'IB B FIEGLEIV dim u e W UNETED STATES FFICE ALBERT H. TINNERMAN, F CLEVELAND, OHIO CLOSED TO]? FOR GAS STOVES Application filed. May 6,

The prevailing practice in the construction of gas ranges is to utilize an open grate frame on the burner box section. The principal objection to this type of construct on 5,: is the fact that the products of combustion escape into the room and that the grate frame is difficult to keep clean. The desire of manufacturers therefore has been to make a closed top, but the chief objection has been the difliculty of preventing the formation of carbon monoxide, and its escape into the room when the burners are lit on a cold stove. Until the stove is warmed up,

there is not suflicient heat developed to cre- 1 ate a satisfactory draft, and as a result the products of combustion accumulate beneath the top and dampen the flame. This causes the formation of carbon monoxide and allows it to escape into the room.

The usual form of construction for removing the products of combustion has been to extend the passageway of a closed top into the oven box and thus to permit escapement of gases through the oven and then into the flue. This procedure however allows the gas to expand into a relatively large space as soon as it enters the oven, and then causes it to pass through a restricted opening when it enters the stove 0 flue. This not only overcharges the oven,

but also interferes seriously with the successful maintenance of a uniform temperature in the oven.

A. further consideration in connection with the use of closed tops arises where a closed top is built separate from the stove and is intended to be placed on the stove in lieu of the open grate. In such cases, the usual grate frame construction restricts the location of the gas outlet to a point approximately one inch below the underside of the closed top. It is thus evident that considerable space is provided for enabling roducts of combustion to accumulate beneat the top, and that such products can escape into the room as soon as the lids are open.

The principal object of the present invention is to provide a stove construction which permits the use of a closed top either as a part of the stove as originally made. or as a 1929. Serial N0. 360,973.

substitute for the open grate, Without resulting in any of the objections heretofore referred to. A further object of the present invention is to expedite the movement of the products of combustion so as to avoid any possibility of interfering with the oven temperature, and to avoid particularly the formation of carbon monoxide during the operation of any of the burners. My invention also contemplates the provision of means for making flue connections which are adapted to be interchanged with either a right or left hand stove.

In the drawings, Fig. 1 is a perspective view of a stove embodying my invention; Figs. 2, 3 and 4 are vertical sections taken on the correspondingly numbered lines in Fig. 1; Fig. 5 is a rear elevation of part of the stove showing the flue connections; Fig. 6 is a vertical section taken on the line 6-6 in Fig. 5; Fig. 7 is a vertical section taken through the stove showing the use of a flue closure plate, which is used when the closed top is removed; Fig. 8 is a perspective view of the closure plate shown in Fig. 7; Fig. 9 is a perspective view of a stove showing a modification of my invention; Figs. 10 and 11 are sections taken on the correspondingly numbered lines in Fig. 9; Fig. 12 is a plan view of a'stove having another modification of my invention; and Fig. 13 is a vertical section taken on the line 1313 in Fig. 12.

Referring now to Fig. 1, 10 indicates a stove having the usual arrangement of burner box and oven box. A grate frame 11 is shown as extending around the burner box while a splash plate 12 is illustrated as extending vertically from the rear edge of the grate frame in the customary manner. The oven shown at 13 has a flue opening 14 which leads into a flue pipe 15, as is shown particularly in Fig. 6. When an open grate is used upon the stove, it is supported in place upon the grate rest 16 which extends around the inner edge of the frame. The open grate is indicated at 17, for example, in Fig. 7.

The closed top, which embodies the present invention, is shown at 20 as a flat memher, which rests upon the grate frame, and

covers the space normally occupied by the open grate. In the preferred arrangement, the member 20 has sloping walls 21, which extend downwardly and which are apertured at 22 at spaced intervals. A flat strip 19 of sheet metal may extend around the top of the frame and protect it while the closed top is resting thereon.

To connect the space beneath the closed top with the flue, I have shown an opening 24 in the splash plate which provides a passageway into a branch flue 25 at the rear of the stove. This branch flue is arranged to be connected to the main flue 15 at a point behind the stove where it is normally concealed from view. To facilitate movement of the products of combustion from the space beneath the closed top and into the flue, I have shown the top as being shaped to provide a conduit, which extends through the opening in the splash plate, and is connected at the rear of the stove to the branch flue. Part of this conduit is shown at 26 in front of the splash plate and another part is shown at 27 behind the splash plate. Parts 26 and 27 are preferably integral with the top 20, wherefore the necessity for securing fastening members through the enameled splash plate is obviated. The conduit when fastened to the flue then serves to hold the top from moving outwardly. A tongue 28 engages the inner edge of the frame and prevents lateral movement in one direction while the oven wall engages the edge 29 and prevents lateral movement in the opposite direction.

A convenient way of connecting the branch flue to the conduit leading from the closed top comprises a coupling 30, which has tongues 31 extending into the conduit and a flange 32 extending outside the branch flue. Another coupling member 33 may be mounted upon the elbow 34 which leads from the oven to the main flue. This last named coupling may have flanges 35 and 36, which respectively engage the elbow 34 and the main flue 15.

Ii hen the closed top is not used, the opening in the splash plate is normally closed by an enameled cover plate 37, which rests upon the grate frame, and is arranged to be held in position by means of a spring clamp 38. This clamp is shown as a one-piece strip of spring metal which is fastened at the midportion thereof to the back of the cover plate, and which is arranged to engage yieldably the rear face of the splash plate upon the extended portions 39 and 4:0. This cover plate can thus be readily removed whenever the closed top is intended to replace the open grate.

In Fig. 9, I have shown a modification of my invention in the nature of a closed top which is positioned within the grate rest 16a and is provided with an integral conduit 46 which passes through the splash plate and is connected to the flue at the back of the stove. In this modification, the upper surface of the closed top is flush with the upper surface of the grate frame. Furthermore, the rear side 17 of the grate frame is cut to permit the conduit 46 to pass therethrough. Thus, the conduit need not project above the top of the stove to an objectionable degree.

In Figs. 12 and 13, I have shown another modification of a closed top 48. In this case, the top is supported upon the grate rest 16?) in the same manner indicated in the modification shown in Fig. 9. The added feature shown in Fig. 12 is the provision for Venting products of combustion. As shown, such provision comprises apertures 49 which extend through the top and along lines adjacent the marginal edges thereof. If desired, the conduit 50 may pass through therear Wall 51 of the grate frame without rising above the upper surface thereof, until it passes through the splash plate.

The apertures which are shown in the closed top are suitable for preventing a dampening action upon the flame of any of the burners if they should be ignited when the stove is cold. Under such circumstances, it is ditficult to start the products of combustion moving toward the flue with the necessary velocity. Unless some provision is made for removing the gases, such dampening action will be apt to cause the forma tion of carbon monoxide which can escape into the room. The apertures 22, which I have provided around the marginal edges of the closed top serve to prevent the accumulation of products of conbustion beneath the top and thus prevent the formation of carbon monoxide gas. As the products of combustion normally escape into the room when the open grate is used, there is no danger in continuing this practice, particularly since it only occurs for a relatively short period of time until the stove is heated. Thereupon, the products of combustion will pass in the natural manner into the flue. Another important advantage in the use of the apertures is that ample secondary air can be supplied for supporting combustion at the rear burners.

I claim:

1. In a gas stove, the combination with a grate frame, of a splash plate associated therewith, and having an aperture therein, a closed top resting upon said frame, a conduit associated with the top and extending through said aperture, and a flue extending behind the splash plate and connected with said conduit.

2. In a gas stove, the combination with an oven box, of a burner box, a closed grate for the burner box, a conduit having the Walls thereof integral with the grate and G2?- tending through the wall of the burnerbox, and another extending through the oven box, and detachable means connecting said conduits to form a common flue.

3. In a gas stove, the combination with a burner box, of a splash plate, a closed top for said box, a conduit leading from the space beneath said top through the splash plate, and a flue connected to said conduit.

4;. In a gas stove, the combination with a burner box of a splash plate having an aperture therein adjacent the midportion of the burner box, a closed top for said box, said top having a portion thereof along the rear edge thereof extending upwardly and passing through said aperture, said upward- 1y extending portion providing a conduit for the products of combustion, and a flue connected with said conduit at the rear of the stove.

5. A closed top for a gas stove, comprising a flat member having marginal edges thereof adapted to rest upon a grate frame and having a portion thereof along one edge shaped to provide aconduit for products of combustion, said conduit being adapted to be directly connected to a flue.

6. In a gas stove, the combination with a grate frame, of a splash plate associated therewith, and having an aperture therein, a removable closed top resting over the frame, and having spaced vents disposed along some of the marginal edges thereof for allowing the escape of excess products of combustion into the room in which the stove is located, there being a conduit associated with the top and extending through the splash plate, and a flue extending behind the splash plate and connected with said conduit.

7 In a gas stove, the combination with an oven box, of an associated burner box, a splash plate having an aperture extending therethrough adjacent the top of the burner box, a closed top for said burner box, a re movable closure for said aperture, and said top having a portion thereof adapted to extend through the aperture when the cover is removed therefrom, a flue leading from the oven box, and detachable means leading from the conduit to the flue.

In testimony whereof, I hereunto afiix my signature.

ALBERT H. TINNERMAN.

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