US3425178A - Rain trap for prefabricated metal chimney - Google Patents

Rain trap for prefabricated metal chimney Download PDF

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Publication number
US3425178A
US3425178A US503170A US3425178DA US3425178A US 3425178 A US3425178 A US 3425178A US 503170 A US503170 A US 503170A US 3425178D A US3425178D A US 3425178DA US 3425178 A US3425178 A US 3425178A
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United States
Prior art keywords
chimney
rain
rain trap
trap
annular
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Expired - Lifetime
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US503170A
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English (en)
Inventor
Richard L Stone
Alan Kinkead
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Wallace Murray Corp
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Wallace Murray Corp
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Publication date
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J11/00—Devices for conducting smoke or fumes, e.g. flues 

Definitions

  • the object of the invention is to provide a means for preventing the rain that normally enters the open end of a prefabricated metal chimney from passing through it and reaching the fireplace or stove from which the chimney extends. If excessive moisture is allowed to reach the furnace or stove apparatus it can cause a serious loss of efliciency and even a malfunctioning or excessive wear and corrosion over extended periods of time.
  • Prior to the present invention the problem was particularly severe with prefabricated metal chimneys because their naturally smooth walls allow water to flow easily toward the furnace or stove below.
  • Previous attempts to prevent the influx of rain in chimney pipes included the use of various traps or'deflectors connected to or associated with the chimney opening or housing outside the building or above the roof level. However, these expedients were [found to have serious disadvantages. For one thing, the installation of unattractive components was architecturally undesirable. Also, such arrangements often caused a very undesirable discoloration of the roof around the chimney, or they seriously aggravated any roof leakage problem around the chimney.
  • another object of the present invention is to provide a rain trap for a prefabricated metal chimney that can be installed at various convenient locations on the chimney inside the building below the roof level. This not only avoids any roof discoloration but it also eliminates any problem of the rain trap freezing, and moreover it provides a trap that can be accessible within the house and therefore easy to clean.
  • a more specific object of the invention is to provide a trap device connectable in a prefabricated metal chimney that intercepts and traps rainwater which strikes the inner wall of the chimney if the rain is descending at even a small angle tothe absolute vertical.
  • a trap device connectable in a prefabricated metal chimney that intercepts and traps rainwater which strikes the inner wall of the chimney if the rain is descending at even a small angle tothe absolute vertical.
  • rain hits the inner wall'bf the chimney it rolls downwardly and is eventually trapped in an annular compartment around the chimney pipe. near its lower end.
  • the trapped rainwater being adjacent the inner wall of the chimney is thus subjected to constant heating by the flue gases, and this causes it to evaporate at a rapid rate. Except under unusual situations, therefore, only a small amount of trapped rainwater is allowed to accumulate.
  • Still another object of the present invention is to provide a rain trap that can be easily coupled with existing prefabricated metal chimney sections, and which is therefore easy to install as well as having a construction that is particularly well adapted for ease and economy of manufacture.
  • FIG. 1 is a view in elevation showing a typical chimney installation utilizing a rain trap embodying the principles of the present invention
  • FIG. 2 is an enlarged plan view of the rain trap shown in FIG. 1;
  • FIG. 3 is a view in elevation and in section taken along the line 3-3 of FIG. 2;
  • FIG. 4 is a somewhat enlarged plan view of the top cap shown in FIG. 1;
  • FIG. 5 is a view in elevation and in section of the top cap of FIG. 4.
  • FIG. 1 shows a typical prefabricated metal chimney assembly 10 having, as one of its components, a rain trap 11 embodying the principles of the present invention.
  • Such metal chimneys are generally formed by prefabricated doublewalled sections 12, as shown, which are coupled together in vertical a1ignment by means of an end coupler.
  • the structural details of one form of double-walled chimney now available commercially are described in Patent No. 3,170,544.
  • the upper end of such a chimney structure usually extends well above the roof level of the building, and it may be surrounded by a suitable housing 13 which is secured to the roof.
  • the upper end 14 of the chimney assembly 10 which may extend slightly above the chimney housing is generally open and unprotected and may therefore be fully exposed to falling rain.
  • a top can 16 may be attached to the upper end 14, and this component and its function will be discussed in detail later with respect to FIGS. 4 and 5.
  • the rain trap device 11 is normally connected to the lower end of a starter section 17 of the chimney assembly, and above the outlet pipe 18 from a furnace, fireplace or stove designated generally by the numeral 19 and located within the building.
  • the size and shape of the rain trap 11 presents an outward appearance similar to that of an ordinary chimney section. As shown in FIGS. .2 and 3, it has an outer wall member 20 made of sheet metal which is spaced outwardly from a concentric inner wall member 21 made of the same material or possibly a lighter gage material. These outer and inner wall members are connected together by an annular bottom ring 22 which has an upright outer flange 23 and a downwardly extending inner flange 24. The outer flange 23 is fixed, as by spot welding or riveting, to the lower end of the outer wall member 20.
  • the inner wall member 21 is preferably provided with an annular bead 25 which is spaced above its lower end edge 26 by a predetermined amount. This bead serves as a stop for initially retaining the inner wall 21 in an axial position relative to the outer wall 20 so that a lower end portion 27 extends below and is readily insertable into a connecting outlet pipe section 18 from the furnace or stove 19.
  • the inner flange 24 of the annular ring 22 may also be welded, bonded or riveted to the inner wall member 21.
  • annular coupling member 29 which enables the rain trap 11 to be readily connected to a prefabricated chimney section 12.
  • This coupling member can take various forms depending 'on the coupler configuration of the chimney section to which it will be attached.
  • the coupling member 29 has a lower peripheral flange 30 that rests on an internal annular bead 31 located near the upper end of the outer wall member 20 and is secured thereto by welding or riveting. From the flange 30 the metal bends inwardly and upwardly to form a relatively narrow wall portion 32 and then turns inwardly to form the top portion 33 which terminates on its inner periphery by a downwardly turned flange 34.
  • This male coupling member thus has a generally annular shape and a size which enables it to fit within a similarly shaped female coupling member 35 of a connecting chimney section 12.
  • annular deflector 36 which comprises an important component of our rain trap 11. It extends upwardly and inwardly around the entire upper edge of the inner wall member 21 of the rain trap to form a surface that will catch every drop of water which flows down and drops from the inner walls of the chimney sections 12 above.
  • the deflector 36 has a lower flange portion 37 which is fixed to the upper edge of the inner wall member 21 and integral with an upper flange portion which forms an inwardly extending conical surface 38.
  • the inner edge 39 of the upper deflecting flange portion has a diameter that is substantially less than the diameter of the inner peripheral flange 34 of the coupling member 29 and the diameter of all the chimney sections 12. This assures that all Water flowing downwardly from the inner walls of the chimney above will fall on and thus be deflected into the annular storage tank 28 of the rain trap 11.
  • an outlet orifice 40 is provided in the outer wall member 20 for draining an overflow from the rain trap in extreme conditions or for cleaning it.
  • a hose or pipe (not shown) can be connected from this orifice to some other suitable drain facility.
  • the constant heat provided by the flow of gases through the chimney 10 causes the collected water to evaporate at a high rate and only during periods of particularly heavy rainfall will the water rise as high as the orifice 40.
  • the percentage of rain falling into its open end which will be trapped in the rain trap 11 will depend on several factors. A most critical factor is the angle of fall of the rain. If the rain comes straight down a relatively large percentage of it will pass by the rain trap because it will not hit the inside walls of the chimney. However, rain rarely falls straight but instead falls at an angle. If the chimney has a normal height or length equivalent to one or more stories, rain falling at even a small angle (e.g., degrees from the vertical) will eventually impinge against and roll down the inside chimney walls, and all rain which hits these walls will fall onto the deflector member 36 and into the annular storage compartment 28 of my rain trap.
  • a small angle e.g., degrees from the vertical
  • the top cap 16 can be used in combination with the rain trap device 11.
  • the top cap 16 may have a disc shape with a peripheral flange 41 and a diameter that is substantially larger than the chimney opening.
  • At least three support members 42 are evenly spaced apart and fixed at one end to the inside surface of the top cap near its periphery. At their lower ends these support members 42 are fixed to a relatively narrow circular band 43 whose ends are connected together by a tightening screw 44.
  • the band is adaptable to fit over the end of the stub section 14 of pipe which is normally placed in the chimney opening, and is held firmly to it when the screw 44 is tightened.
  • rain protection means comprising, in combination:
  • a rain trap connected to and in line with a prefabricated chimney section, said rain trap being comprised of a pair of concentric Wall members;
  • annular ring intetrconnecting said wall members near their lower ends and forming therewith an annular storage compartment
  • annular ring interconnecting said wall members member at its upper end and having a peripheral inner flange having a diameter substantially equal to the inside diameter of the chimney;
  • a deflector member fixed to the top of said inner wall member having an inwardly extending conical surface and terminating at an upper edge whose diameter is substantially less than said peripheral inner flange and the inside diameter of said chimy;
  • top cap attached to the upper end of said chimney assembly and extending completely above the area of the chimney opening and thereby preventing rain from falling vertically past said rain trap.
  • rain protection means comprising, in combination:
  • a rain trap connected to and in line with a prefabricated chimney section, said rain trap being comprised of a pair of concentric wall members;
  • annular ring interconnecting said wall members near their lower ends and forming therewith an annular storage compartment
  • annular coupler member fixed to said outer wall member at its upper end and having aperipheral inner flange having a diameter substantially equal to the inside diameter of the chimney;
  • a deflector member fixed to the top of said inner wall member having an inwardly extending conical surface and terminating at an upper edge whose diameter is substantially less than said peripheral inner flange and the inside diameter of said chimney;

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chimneys And Flues (AREA)
US503170A 1965-10-23 1965-10-23 Rain trap for prefabricated metal chimney Expired - Lifetime US3425178A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US50317065A 1965-10-23 1965-10-23

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US3425178A true US3425178A (en) 1969-02-04

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Application Number Title Priority Date Filing Date
US503170A Expired - Lifetime US3425178A (en) 1965-10-23 1965-10-23 Rain trap for prefabricated metal chimney

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US (1) US3425178A (xx)
BE (1) BE688675A (xx)
CH (1) CH453650A (xx)
NL (1) NL6611280A (xx)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3782062A (en) * 1972-07-14 1974-01-01 American Air Filter Co Modular assembly for attaching skirt facade to an air handling unit
US3921509A (en) * 1973-11-16 1975-11-25 Jimmy L Curry Chimney cover assembly
US4202255A (en) * 1978-10-23 1980-05-13 Mcnamara Joseph R Chimney cap
US4811534A (en) * 1984-10-31 1989-03-14 Newsome R Wayne Chimney facade system
US5003739A (en) * 1984-10-31 1991-04-02 Newsome R Wayne Chimney facade system
US20130283708A1 (en) * 2012-04-30 2013-10-31 Centre Scientifique Et Technique Du Batiment Tropical chimney, namely ventilation well with hurricane-resistant function, and associated building and kit

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1588321A (en) * 1925-10-19 1926-06-08 Oakes Mfg Company Adjustable roof saddle for brooder houses
US2382579A (en) * 1944-02-05 1945-08-14 Queirolo William Condensation drain
US2392631A (en) * 1945-03-17 1946-01-08 Berndt Edward Flue-liner drain
US2482577A (en) * 1946-07-08 1949-09-20 Donaldson Co Inc Rain trap for ventilating exhaust stacks
US3084479A (en) * 1959-08-27 1963-04-09 Jean C Struben Trailer awning

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1588321A (en) * 1925-10-19 1926-06-08 Oakes Mfg Company Adjustable roof saddle for brooder houses
US2382579A (en) * 1944-02-05 1945-08-14 Queirolo William Condensation drain
US2392631A (en) * 1945-03-17 1946-01-08 Berndt Edward Flue-liner drain
US2482577A (en) * 1946-07-08 1949-09-20 Donaldson Co Inc Rain trap for ventilating exhaust stacks
US3084479A (en) * 1959-08-27 1963-04-09 Jean C Struben Trailer awning

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3782062A (en) * 1972-07-14 1974-01-01 American Air Filter Co Modular assembly for attaching skirt facade to an air handling unit
US3921509A (en) * 1973-11-16 1975-11-25 Jimmy L Curry Chimney cover assembly
US4202255A (en) * 1978-10-23 1980-05-13 Mcnamara Joseph R Chimney cap
US4811534A (en) * 1984-10-31 1989-03-14 Newsome R Wayne Chimney facade system
US5003739A (en) * 1984-10-31 1991-04-02 Newsome R Wayne Chimney facade system
US20130283708A1 (en) * 2012-04-30 2013-10-31 Centre Scientifique Et Technique Du Batiment Tropical chimney, namely ventilation well with hurricane-resistant function, and associated building and kit
US9003717B2 (en) * 2012-04-30 2015-04-14 Centre Scientifique Et Technique Du Batiment Tropical ventilation well

Also Published As

Publication number Publication date
BE688675A (xx) 1967-04-21
NL6611280A (xx) 1967-04-24
CH453650A (de) 1968-03-31

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