US2183402A

US2183402A - Chimney cap

Info

Publication number: US2183402A
Application number: US257123A
Authority: US
Inventors: Ezra W Kepple
Original assignee: Individual
Current assignee: Individual
Priority date: 1939-02-18
Filing date: 1939-02-18
Publication date: 1939-12-12
Anticipated expiration: 1956-12-12

Description

Dec. 12, 1939. E. w. KEPPLE 2,l83,402

CHIMNEY CAP Filed Fb. 18, 1939 2 Sheets-Sheet 2 A TTZZRNEK Patented Dec. 12, 1939 ,ATTENT OFFICE CHIMNEY C'AP y Ezra, W. Kepple,

xApplicatio February 1 8,

` 12 Olaims.

My invention is an improvement inventilating chimney caps for terminal application to the outlet Conduit of gases of combust-ion, as a fiueor stack, to improve the draft thereof.

More particularly it' is designed for use as a chimney cap for'house fluesmade of brick or other refractory material, and is especially designed to assist .and control thedrat under all weather conditions. Generally stated the device consists of a hollow coping or' cap of concrete, terra cotta, sheet metal, or other suitable ma-` terialhaving a supporting base and of particular externaland internal shape best 'adapted to effect the desired results, as shall be more fully hereinafter. described.

Referring to thedrawings showing ferred constructions:

`Fig. 1 isa 'perspective view of the cap, de-

tached; i i I Fg.. 2..is'.acentral Vertical section of a concrete cap, on the' line .II-II of Fig. 1, andlof the uppersend of' a. chimney fiue;

i Big. 3 is' a cross section on theline III--IIL looking upwardly;

Fig. &His a` View like Fig..2, showing the cap as. made ofisheet metal;

Fig.` 5 isa view like Fig.- 1., showing a modified construction;

.Fig. 6. is a cross section like Fig. 3 .onthe line the preof Fig. 5.

i at the bottom with the inner faces of the chimney walls. Such faces 5 extend upwardly to near the` .top-4 by. four straight or slightly' inwardly 7 sloping planes, for convergence 'and .gradual cross area reduction.

Near; the, topxthe interior, cross area; isabrupt'- ly, .restricted. by; the inwardly beveled: shoulders 5 extending from the angular joint or bend l with faces; 5::to the lower edges of the finally restricted square' outlet ,opening 8, terminating at? the; extreme top of the cap.

v Suchwopening is: denedwithin the compare# tively-' short `inwardly inclined faces 9' beyond whichgthe four outer sides ofthe,top of the Greensbrg, Pa. 1939, Serial No. %7,123 (o. 72-88 The- Walls increase' in thickness downwardly towards the -base- 4 and with an outer scotia curve-of constant downwardly reduced radius as clearly indicated at !3, forming streamline surfaces on all four sides.

By such construction it will.be seen that -the base is of ample strength and Weight, assisting in stability when in position, and with a pleasing architectural appearance. Incidentally,

` the-bottom of the base may be provided with a' s surrounding- V or other shape groove M for' 'firm' anchoring engagement with 'the mortar or cementz.

Assuming' the usually diflicult conditions of lateral winds, either directly against either of the` four` main extcrior surfaces, or angularly against any two of them, the lower concaved and upwardly tapering outer faces eifect ;desired deflecton of'the. Currents, asindicated by' the arrows'Fig. 2.

As suchcurrents move inwardly they are' also guided upwardly, while the' final bevels !0, of say 30 tol ifi` toxthe horizontal, more or less, produce: an abrupt upward. and inward course. !The combinedieffect 'of the wind Currents isto thereby produce an' uplifting :suction draft on the gases passing out through the cap.

'Suchgases likewise are caused to converge during 'their passage through the cap .from bottom .to top, and. are' finally further restricted ab-ruptly by. the inwardly beveled shoulders 5 andconverging outlett, with resulting acceleration. r r

Ordinarily; in, calm weather, the: interier formation of. the cap 'greatly contributes to and improves the natural draft; of' the chimney. The 'eifectof a breeze .or wind. inwthe manner described. is; toiexert a: slightassisting suction or partial Vacuum, with a resulting improvement in. accelerating: and ;stabilizing `the draft of. the main chimney emine., such advantageous'results have in-fact been. ,Secured byprolonged actual use of-my construction under the various conditions'mentioned.

Whilesatisfiactory results; are Secured: bythe concreteaconstruction, as above described.. the

cap may also be Very efficiently made of sheet metal, as in Fig. 4.

The general proportions may be maintained as to both external and internal faces, but utilizing a downward extension of the inner face wall members for insertion into the top of the chimney, and with a very slight variation from upward tapering to substantally vertical formation of these members.

In such Construction I utilize a rectangular base plate da for placement on the chimney top, to which the inner box-like shell Ea and the outer shell l3a are connected, as by Welding or other suitable means.

Inner shell extends through and suiciently below base plate ta for close intertting engagement within the top portion of chimney 4, so that either with or without the mortar 3 the entire cap will be firmly mounted in position. At its upper end shell 5a is bent inwardly to form the beveled draft constricting shoulders Ba beyond the angular bends ?a and terminates in the finally restricted square outlet opening Ba, within the surrounding upper edge terminals Qa of the inner shell.

The upper terminal portions of outer shell l3a are bent inwardly over the terminals of the inner shell at confining angles and are secured thereto, as by welding, providing the final bevel faces Ina te'minating inwardly in the angle `lips Ha.

Outer sections |3a extend downwardly from the lower edge Iza of bevel !Ua substantally straight for a limited distance and then gradually concavely outwardly, terminating in the outer edges of the base portion, as in Figs. 1 and 2.

Such lower edges of the outer walls are securely connected with the base plate da, as by welding.

It Will be understood of course that in sheet metal Construction the inner and outer sections together provide and constitute in effect the main surrounding wall portions of the complete cap, although with intervening hollow spaces, instead of being continuously solid.

otherwise than by the substitution of sheet metal for concrete, the general Construction closely conforms in all essential respects as to proportions, inner and outer surfaces, etc. and functions and gives results in operation as` described, and with equal facility in manufacture and use.

I show in Figs. 5 and 6 a further modification of the molded or concrete embodiment of the in- Vention, generally similar to that of Figs. 1, 2 and 3, but with additional useful features facilitating confining and deflecting control of wind Currents.

In such the main elements and features are retained comprising the laterally extending base lb for placement on the chimney 2b, with the inner faces Ec leading up to the inwardly beveled shoulders Gb for Construction of the gases of combustion in their passage towards and out of the top opening 8b within the surrounding edge faces gb. The outer wall faces are concavely formed as at I 3b leading upwardly to the edges l2b at the bases of bevel faces !Ub leading inwardly to the edges llb of the middle outlet opening.

For the purpose of providing supplemental wind control and restriction each of the several corner edges of concaved surfaces l3b are provided with comparatively narrow outwardly extending webs or fin-like fianges l5b extending from top to bottom of the cap. These act as obstructing wind dams tending to more or less centralzing connement of the Currents, with resulting increase in their effect in passing upwardly over one, or both concave faces of adjacent walls, as already described.

They are further useful in stiffening and bracing the cap at each corner, and add to the architectural appearance of the device.

While the general proportions of either form of the device should be approximately as illustrated, it will be understood that they, or matters of size, dimensions, material, or other incidental matters may be changed 'or vaied from ,without departure from the principle of the invention and within the scope of the appended claims'.

What I claim is:

1. A rectangular chimney cap as described having a supporting base of maximum size for placement on a chimney'and extended upwardly forming a wall around a middle gas circulation opening with inner confining faces terminating in a constricted shouldered outlet opening, the outer faces of the cap converging inwardly from the rim of the base and concaved upwardly with increasing radii to a common transversely plane, and then angularly defiected inwardly and upwardly to the edges of the outlet opening to form beveled air deflecting faces adjacent the outlet opening.

2. A rectangular chimney cap having four transversely straight walls enclosing a middle gas outlet opening defined within upwardly and inwardly disposed inner wall faces terminating in a restricted upwardly tapering discharge opening, the outer wall faces flaring concavely outwardly in formation of a laterally extending base and thereabove in substantally plane upper inwardly tapering formation and having terminal inwardly and upwardly sloping bevel faces extending inwardly to the edges of the discharge opening.

3. A rectangular molded chimney cap having four integral transversely straight walls enclosing a middle gas outlet opening defined within upwardly and inwardly disposed inner wall faces terminating in a restricted upwardly tapering discharge opening, the outer wall faces fiarng concavely outwardly in formation of a laterally extending base and thereabove in substantally plane upper inwardly tapering formation and having terminal inwardly and upwardly sloping bevel faces extending inwardly to the edges of the discharge opening.

4:. A rectangular molded chimney cap having four integral transversely straight walls enclosing a middle gas outlet opening defined within upwardly and inwardly disposed inner wall faces terminating in a restricted upwardly tapering discharge opening, the outer wall faces fiaring concavely outwardly in formation of a laterally extending base having a mortar engaging recess, the upper portions of the wall faces being in substantially plane slight inwardly tapering formation and having terminal wind deecting bevel faces extending inwardly to the edges of the discharge opening whereby to effect an uplifting suction draft on converging gases issuing through the tapering discharge opening at the top of the cap.

5. An integral chimney cap of concrete consisting of surrounding walls having a relatvely wide supporting base, the inner faces of said walls extending upwardly towards the top, then disposed more abruptly inwardly and then upwardly with slight inward taper forming a restricted discharge opening, the outer wall faces bein concaved from the outer edges of the base and I thereabove with increasing radii and terminating in upper inwardly disposed plane surfaces, and having final wind deflecting bevel faces extending inwardly to the edges of 'the discharge opening.

6. A chimney cap of sheet metal consisting of an inner gas circulation section terminating in an upper constricted shouldered outiet opening, a surrounding base plate of maximum size for placement on a chimney, and an outer wind defiecting section connected With the base piate having lower faces converging inwardiy and concaved upwardly and bent inwardly over and secured to the top portion of the inner section to form beveled air defiecting faces adjacent the outlet opening'.

'7. A chimney cap of sheet metal consisting of g an inner gas circulation section terminating in an upper constricted shouldered outlet opening, a

surrounding base plate of maximum' size for placementon a chimney, and an outer Wind defiecting section connected With the base plate having lower faces converging inwardly and concaved upwardly and bent inwardlyover and se-- cured to the top portion of the inner section ter minating at the edges of the outlet opening and forming beveled air defiecting faces adjacent the outlet opening. v

8. A chimney cap as in claim 6 wherein the in ner section extends downwardly below the base plate for engagement within a chimney top.

9. A chimney cap as in claim 3 wherein the several corners between adjacent concaved outer faces are provided With outvvardly extendng wind arresting extensions.

10. A chimney cap as in claim 3 Wherein the severaicorners between adjacent concaved outer faces are provided with outvvardly extending integrai wind arresting extensions in the form of comparativeiy thin fianges.

li. A 'ectangular chimney cap as described having a supporting base of maximum size for placement on a chimney and extended upwardly forming a Wall around a middle gas circulation opening With inner confining faces terminating below inwardly disposed upwardly sloping restricting' shouiders having inwardlly disposed faces terminating in a constricted outlet opening, the outer faces of the cap cenverging inwardly and upwardly from the rim of the base to a commen transverse plane, and then angularly deflected inwardly and upwardly to the edges of the outlet opening to form beveled air deflecting faces adjacent the outlet opening.

12. A rectangular chimney cap as described having a supporting base of maximum size for piacement on a chimney and extended upwardly forming a wall around a middle gas circuiation opening with inner conning faces terminating below inwardly disposed upwardly sloping restricting shoulders having inwardly disposed faces terminating in a constricted outlet openi ing, the outer faces of the cap converging invvardly and upwardly above the base in substantially plane inwardly tapering formation and having terminal inwardly and upwardly sloping bevel faces extending inwardly to the edges of the outlet opening.

E-ZRA W. KEPPLE.