US 3505976 A
Description (OCR text may contain errors)
April 14, 1.970 c. H; MILLER 3,505,976
GAS FIRED CHICK BROODER DEVICE i I Filed Nov. 29. 1967 9 d la l LZ Flgl jl 9 1 4 y' A, 'l, l. 3 f, vf 5", i "M vf'vx" ,'mf "i V .1f Vw' MN, ",Rv; ,a "K" ,v1 ff'a'mxw' if 43 YNVPNTOR,
39 mmf/HMH@ YOU/)g4- Thompson ATTORNEYS United States Patent() 3,505,976 GAS FIRED CHICK BROODER DEVICE Conrad H. Miller, Rogers, Ark., assignor to Hoyt Corporation, Rogers, Ark. Filed Nov. 29, 1967, Ser. No. 686,446 Int. Cl. A01k 31/20 U.S. Cl. 119-32 8 Claims ABSTRACT F THE DISCLOSURE The present invention relates to chick brooders, more particularly of the type in which a burner is disposed beneath a suspended downwardly concave hood.
It is an object of the present invention to provide a l chick brooder having improved structure for radiating heat downwardly.
It is also an object of the present invention to provide a chick brooder in which the ilow of heat by convection is improved.
Finally, it is an object of the present invention to provide a chick brooder which will be relatively simple and inexpensive to manufacture and install, easy to operate, maintain and repair, and rugged and durable in use.
Other objects and advantages of the present invention Will become apparent from a consideration of the following description, taken in connection with the accompanying drawing, in which:
FIGURE 1 is a cross-sectional view of a chick brooder according to the present invention;
FIGURE 2 is a perspective view of the underside of the improved radiant of the present invention; and
FIGURE 3 is a cross-sectional view of the radiant of FIG. 2.
Referring now to the drawing in greater detail, there is shown a chick lbrooder according to the present invention, comprising a downwardly concave ribbed hood 1 of sheet metal or the like, which is suspended by hangers 3 from the ceiling of the building (not shown). As is customary, the brooder can =be suspended at any desired height or raised or lowered, in order to obtain the desired temperature.
Hangers 3 terminate at their lower ends in hooks 5 which extend through ears 7 at the upper ends of straps 9. Ears 7 extend through slots in the top of hood 1 and are interconnected with straps 9 by horizontal portions .on which the hood rests.
The lower ends of straps 9 converge and are secured to and support a plate 11 which is also the support plate for the burner 13. Gas is supplied to the burner 13 from a source of gas (not shown), by means of a supply conduit 15 controlled by a valve 17. A pilot conduit 19 supplies gas to a pilot light for burner 13. A thermocouple 21 is provided for the automatic control of valve 17.
Intermediate their height, the straps 9 have horizontal portions 23 on which detachably rests a horizontally disposed annular sheet metal heat-diverter ring 25. Ring 25 is also a iigure of revolution and is upwardly concave, with its radially inner edge disposed lower than its radially outer edge. In its preferred form, ring 25 has a radially inner portion 27 disposed in a horizontal plane and a radially outer portion 29 that is upwardly inclined and ice is conical in the illustrated embodiment. It will be understood, however, that ring 25 can have smoothly rounded curves as viewed in cross section, such as an annular segment of a spherical orv elliptical or parabolic or hyperfbolic surface. Ring 25 can also be substantially entirely conical.
On its radially inner edge, ring 25 supports a radiant 31 of ceramic material, preferably refractory material such as iire clay or the like. Radiant 31 has an annular downwardly opening peripheral recess 33 that has an upright inner side wall 35 and a horizontal upper side wall 37. Recess 33 is thus in the form of a downwardly and outwardly opening circular rebate. Side wall 35 serves to bcenter radiant 31 in ring 25. Side wall 37 supports radiant 31 on the radially inner edge of ring 25.
Radiant 31 is of generally uniformthickness throughout and is in the general form of a figure of revolution. 'I'he conguration of the underside of radiant 31 is of great importance. The center of the underside of radiant 31 is occupied by a central boss 39. Radially outwardly of boss 39, the underside of radiant 31 is an annular surface 41 which is a figure of revolution which is the locus of a downwardly concave generator line moving about a vertical axis, the radially inner end of the line being substantially lower than the radially outer end of the line. Preferably, the slope of the radially inner end of the line is steeply inclined and of the order of magnitude of 30-45 of arc, while the slope of the radially outer end of the generator line for annular surface 41 is less steeply inclined and may be zero or even sloped a few degrees in the opposite sense from the radially inner end of the line. The hot gas flow is therefore rapid at the hot center, and relatively slow at the outer portion of the radiant.
Annular surface 41 is covered with a multiplicity of downwardly extending generally conical projections 43 that are integral with the material of radiant 31. Radiant 31 is preferably cast or molded from a ceramic slurry or slip, so that projections 43 can easily be formed by casting.
In operation, with burner 13 lit, heat rises against central boss 39 and spreads radially outwardly of radiant 31 by convection. The hot gas moves quickly up the most steeply inclined radially inner portions of annular surface 41, and more slowly toward the radially outer portions. In view of the fact that the hot gas is at the same time spreading over a larger surface, the entire annular surface 41 thus tends to be evenly heated. In other words, the hot gas gives up more total heat to the radially outer portions of surface 41, because it spends more time in contact with them as it travels more slowing past them; but this is balanced by the fact ythat the total area occupied by these radially outer portions is substantially greater than that occupied by the radially inner portions.
The slope of the radially outer portion of annular surface 41 is not much diiferent from that of the radially inner portion of ring 25, so that there is a smooth progression of the rising hot gases from radiant 31 to ring 25 and beyond.
At the same time, the projections 43 greatly increase the radiating surface area of radiant 31, so that maximum radiative heat transfer to the chicks is achieved.
From a consideration of the foregoing disclosure, therefore, it will be understood that all of the initially recited objects of the present invention have lbeen achieved.
Although the present invention has been described and illustrated in connection with a preferred embodiment, it is to be understood that modifications and variations 'may be resorted to without departing from the spirit of the invention, as those skilled in this art will readily understand.
Having described my invention, I claim:
1'. In a chick brooder of the type having a hood and a burner disposed beneath the hood, the improvement comprising a ceramic radiant disposed above and centrally adjacent over the burner and below the hood, the under surface of the radiant being a contoured surface and being upwardly outwardly inclined and being defined at least in part rby a downwardly concave generator line whose radially inner end is substantially lower than its radially outer end and that revolves about a vertical axis near the center of the radiant, the radially inner portion of said under surface of said radiant being substantially more steeply inclined to the vertical than the radially Outer portion of said under surface, said contoured surface constituting a means for conducting the hot gas flow from the burner at a faster rate past the center of the radiant than past the outer portion of the radiant.
2. A chick brooder as claimed in claim 1, and a plurality of downwardly extending conical projections on the under surface of the radiant, the axes of said conical projections being parallel to said vertical axis.
3. A chick brooder as claimed in claim 1 and a plurality of downwardly extending tapered projections on the under surface of the radiant.
4. A chick brooder as claimed in clairn 3, said projections being conical.
5. A chick brooder as claimed in claim 1, said radiant having a downwardly outwardly opening rebate about its lower marginal edge, and means extending into said rebate to support said radiant in a horizontal position above the burner.
6. A chick brooder as claimed in claim 5, said support means comprising a generally horizontally disposed annular sheet metal ring.
7. A chick brooder as claimed in claim 6, said sheet metal ring being an upwardly concave ligure of revolution whose radially inner edge is disposed lower than its radially outer edge.
I8. A chick brooder as claimed in claim 6, and spaced supports interconnecting the :burner and the hood, said metal ring resting by gravity on said spaced supports.
References Cited UNITED STATES PATENTS 2,051,213 8/1936 Hamilton 126-92 2,130,086 9/1938 Hart 126-85 2,240,571 5/1941 Olson et al. 119-32 2,985,137 5/1961 Horne 119-32 3,279,455 10/ 1966 Corey 126-92 3,349,752 10/1967 Murphy 119-32 ALDRICH F. MEDBERY, Primary Examiner U.S. Cl. X.R. 126-92