Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.

Patents

  1. Advanced Patent Search
Publication numberUS3731952 A
Publication typeGrant
Publication dateMay 8, 1973
Filing dateFeb 2, 1972
Priority dateFeb 2, 1972
Publication numberUS 3731952 A, US 3731952A, US-A-3731952, US3731952 A, US3731952A
InventorsElwart B
Original AssigneeRoyal Seven Inc
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Flashing for roof vent pipes
US 3731952 A
Abstract
A flashing for roof vent pipes and the like in which a frusto-conical shield member surrounding the vent pipe has an enlarged flat base flange engaging the rooftop surface and an upper portion provided with a plurality of concentric cylindrical stepped portions selectively diametered to fit varying pipe sizes, the smaller stepped portion being readily severed from the remainder so that the next larger stepped portion will fit a larger pipe, with O-ring seals having slightly smaller inner diameters than the inner diameters of the vent pipe engaging stepped portions being fitted adjacent thereto for sealing engagement with the vent pipe. At least a portion of the shield member has circular corrugations extending therearound so that the shield will flex to conform with slight differences in roof pitches, as well as to provide flexing required by expansion and contraction of the building structure.
Images(1)
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

United States Patent 1 1 1111 3,731,952

Elwart 1 1 May 8, 1973 [541 FLASHING FOR ROOF VENT PIPES 1,307,295 9/1962 France ..285/l77 75 I t: B .EI t,F dl,M' h. 1 men or J war em a e Primary Examiner-Thomas F. Callaghan [73] Assignee: Royal Seven Inc., Ferndale, Mich. AttorneyR0bert C. Hauke et al.

[22] Flled: Feb. 2, 1972 ABSTRACT [2]] Appl' 222893 A flashing for roof vent pipes and the like in which a frusto-conical shield member surrounding the vent [52] U.S.Cl. ..285/3, 285/44, 285/]77 p p has an enlarged fl base fl ng ng ging he 51 Int. Cl. ..E04d 13/14 rooftop Surface and an pp Portion Provided with a [58] Field of Search ..285/4, 3, 44, 43, plurality of concentric cylindrical pp Portions 285/42177235 selectively diametered to fit varying pipe sizes, the smaller stepped portion being readily severed from the [56] References Cited remainder so that the next larger stepped portion will fit a larger pipe, with O-ring seals having slightly UNITED STATES PATENTS smaller inner diameters than the inner diameters of the vent pipe engaging stepped portions being fitted Elvlllart adjacent thereto for Sealing engagflment the vent 2,025,067 12/1935 M1 er 5/17 p p At least a portion of the shield member has cip 2,985,465 5/1961 Church ..285/43 X l h d h h 1 844 870 2 1932 Helling ..285/43 coirugat'ons mg 7 t at 35214l4 7/1970 Malissa 285/43 X shield will flex to conform w1th slight differences in FOREIGN PATENTS OR APPLICATIONS roof pitches, as well as to provide flexing required by expansion and contraction of the building structure.

7 Claims, 5 Drawing Figures FLASHING FOR ROOF VENT PIPES REFERENCE TO RELATED PATENT The present application constitutes an improvement over my issued U. S. Pat. No. 3,602,530 dated Aug. 31, 1971.

BACKGROUND OF THE INVENTION The present invention relates to devices for retaining and sealing roof vent pipes and the like of different diameters where they extend through the roof to prevent water leakage at their juncture with the roof.

DESCRIPTION OF THE PRIOR ART The following patents are known: U. S. Re No.

26,026, and U. S. Pat. Nos. 558,025, 580,515, 1,000,506, 1,258,884, 1,317,446, 1,558,503, 2,244,280, 2,985,465, 3,098,663, 3,151,894,

3,163,101 and Belgium Pat. No. 511,895, as well as my own U. S. Pat. No. 3,602,530.

Flashings previously used have sometimes been made of rubber and the like materials which are intended to stretch around the vent pipe for sealing thereof, but they are usually not satisfactory due to their inability to withstand weather and to conform to expansions and contractions of the vent pipe and other roof structure over protracted periods. Other ordinary constructions utilize metal flashings at the juncture of the vent pipe and the roof, with sealing being provided by soldering or caulking around the joint of the flashing with the vent pipe, but these too often crack and leak water and rust out with time. Flashings customarily are made in sizes to fit vent pipes of particular diameters and since vent pipes usually come in different diameters building contractors must maintain a supply of all sizes of flashings.

SUMMARY OF THE INVENTION My invention described and shown in U. S. Pat. No. 3,602,530 has for its primary object the formation of a vent pipe flashing which is readily adaptable to various pipe sizes, the flashing having a plurality of substantially concentric cylindrical stepped portions, such that the inner or smaller diameter stepped portion may be readily severed from the flashing to expose another larger stepped portion readily fitting the particular pipe and to form a seal around the periphery of the vent pipe even when the same has minor imperfections. The flashing also has the capability of conforming readily to varying roof pitches and is readily adaptable to expansion and contraction of the roof structure.

The embodiment of the present invention constitutes an improvement in which separate O-ring seals are carried adjacent the stepped portions internally adjacent thereof for close fitting to the vent pipe when the flashing is installed, providing a yet more effective and permanent seal between the flashing and the vent pipe.

DESCRIPTION OF THE DRAWINGS A more complete understanding of my invention may be had by reference to the accompanying drawings illustrating several embodiments of the present invention, in which like reference characters refer to like parts throughout the several views, and in which:

FIG. I is a fragmentary perspective view ola rooftop showing a flashing of a preferred embodiment of the present invention installed around a vent pipe;

FIG. 2 is a top view of the vent pipe and flashing of FIG. 1;

FIG. 3 is a vertical cross-sectional view taken through the rooftop flashing of FIG. 2 and indicating in phantom lines vent pipes of different diameters extending therethrough;

FIG. 4 is an enlarged fragmentary cross-sectional view of a portion of the flashing illustrating more in detail the location of the cutting line to remove the top flange or rim of the flashing for enlargement of the diameter of the opening; and

FIG. 5 is another perspective view of the flashing of the present invention illustrating the top or inner flange or rim of the flashing being removed to accommodate a vent pipe of larger diameter.

DESCRIPTION OF THE PREFERRED EMBODIMENT As illustrated in FIG. 11, a rooftop 10 has a conventional vent pipe 12 extending vertically therethrough and may also have a conventional vent pipe cap, which is here omitted for clarity.

The improved structure comprises a flashing 146 which peripherally engages the vent pipe 12, and has a flat base 166 adapted to be secured to the rooftop 10, as shown, by any means such as nails or the like. The flashing 146 comprises a substantially frusto-conically shaped body 118G extending from the flat base 166 at an oblique angle relative to the plane of the flat base 166. The upper rim is formed, as shown, into a pair of concentric cylindrical stepped portions 96 and 98 connected to each other and to the body of the flashing by connecting ridge portions 96a and 98a respectively. The uppermost portion 96 is dimensioned so that its inner surface will conform substantially with the outer diameter surface of a vent pipe 12, in this case being a conventional three inch OD. pipe, indicated in phantom lines. In the event the flashing is to be used with a larger pipe, as for example a conventional four inch 0.D. pipe indicated by the phantom line 12A in FIG. 3, the uppermost portion 96 is removed by cutting or otherwise severing the top 97 of the flashing at the junction formed by the ridge 96a with the inner cylindrical portion 98 along a cuttingline 100, as shown in detail in FIG. 4.

As particularly seen in FIG. 3 and in larger detail in FIG. 4, each of the portions 96, 98, which are concentric with each other around a center line X of the flashing, is provided with an O-ring or other similar sealing means 102 and 103 respectively which are of slightly smaller inner diameter than the respective vent pipes 1.2 and 12A and are compressible to a degree such that the O-ring seals will each conform readily to the shape of the respective vent pipe including its minor imperfections and irregularities to maintain a satisfactory water seal between the vent pipe and the flashing inner surface. If necessary the O-ring seals 102 and 103 may be bonded to the inside of the portions 96, 98 to securely keep them in place, or could be otherwise formed integrally with the material of the flashing.

A plurality of circular corrugations 104 extend around the annular portion (respective to the roof line) of the body 186 of the flashing 146 so that it will flex within limits to conform the base 16G to rooftops of varying pitches, and also to adapt to contractions and expansions of the roof structure.

With particular reference to FIGS. 4 and 5, if it is desired to use a vent pipe 12A of larger diameter, the top portion 97 of the body 186 of the flashing is cut off along the line 100 (FIG. 4) just below the uppermost portion 96. The cutting line 100 is on a plane normal to the central axis X" (FIG. 3) of the flashing and thus assures concentric installation of the larger vent pipe 12 in the flashing around the central axis X." It will be seen in FIG. 4 that, after the top portion 97 has been cut off along line 100, an axial cylindrical ridge portion 99 remains as a continuity of the inner portion 98 and forming together therewith a retaining means for the O- ring 103, holding the O-ring in place as it is compressed on the flashing being installed downwardly over the vent pipe. The flashing is formed to have a somewhat thinner periphery along the plane of the line 100 for easier cutting.

As seen in FIG. 1, the flashing 14G is installed on the rooftop in such a fashion that a portion of the flat base 166 is extended underneath the shingles 11 and the remaining portion lies on top of the shingles 11. However, the particular securement of the flashing to the rooftop 10 is immaterial and forms no part of the present invention.

The flashing 140 may be a stamping made from sheet metal, but is preferably molded of a suitable plastic or any other suitable and easily formable sheet material.

The construction herein described thereby provides a vent pipe flashing structure having an expanded versatility. If the flashing is made of plastic, polypropelene or polyethylene may be used, which have the properties required to conform sufficiently to the imperfections in the pipe and retain the shape of the pipes imperfections and irregularities at all times thereafter, while yet being weather resistant, tough and durable, as well as being slightly flexible for the purpose described. Multiple size usage of the singleflashing structure reduces the contractors inventory of flashings, and the flexible and slightly deformable properties of the plastic, particularly in conjunction with the use of the O-ring seals as shown, eliminates the necessity for caulking and prevents thermal expansion and contraction of the vent pipe from cracking the flashing or breaking the seal.

Although I have described only one preferred embodiment of my invention, it will be apparent to those skilled in the art to which the invention pertains that various changes and modifications may be made therein without departing from the spirit of the invention or the scope of the appended claims.

Iclaim:

l. A flashing for rooftop vent pipes and the like of different diameters, comprising:

a substantially frusto-conical shield member for enclosing a portion of said vent pipes upstanding from said rooftop and having a base adapted to engage the rooftop surface, said shield member having a plurality of stepped upper portions of varying diameters dimensioned to engage the outer diameters of differently sized vent pipes, at least said upper portions being of a material having the properties of deforming slightly to conform to the shape of said pipes including minor imperfections thereof, the smaller of said portions being severable for adapting said shield to selected vent pipes, and

sealing rings fitting within portions of said shield immediately below and of larger diameters than said stepped upper portions, said sealing rings having slightly smaller inner diameters than the adjacent upper portions for effectively sealing said pipes relative to said shield member.

2. The flashing as defined in claim 1 in which said sealing rings are readily deformable to conform to manufacturing variations in the diameters of said pipes.

3. The flashing as defined in claim 1 in which ,1 portion of said shield intermediate the flat base and the upper portions has corrugations extending in planes at an angle oblique to the central axis of said vent pipes, and said shield member being distortable in the area of said corrugations without distortion in the area of said stepped upper portions and to a degree whereby the flat base may move relative to the axis of said pipe to conform selectively to different roof pitches and to adapt to normal roof structure contractions and expansions.

4. The flashing as defined in claim 1 in which said shield member has its smaller end constituting the upper portion and the larger end being integral with the flat base.

5. The flashing as defined in claim 1 in which said upper stepped portions are adapted to retain said sealing rings which are outwardly expansible upon engaging around said pipe.

6. The flashing as defined in claim 1 and having annular ridge portions intermediate said stepped upper portions for indicating a separation line and facilitating easy separability of said smaller upper portion.

7. The flashing as defined in claim 1 in which a portion of said shield intermediate said base and said upper stepped portions has small step-like corrugations extending in planes substantially parallel to the plane of said base, and said shield member being slightly distortable at least in the area of said corrugations to a degree whereby said base may move relative to the central axis of said pipe to conform selectively to different roof pitches and to adapt to roof structure contractions and expansions.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US1844870 *May 15, 1931Feb 9, 1932Carpenter & Paterson IncRoof joint
US2025067 *Dec 17, 1934Dec 24, 1935Miller Thomas STank filling device
US2985465 *Dec 20, 1957May 23, 1961Monarch Rubber CompanyRoof flange construction
US3521414 *Aug 23, 1968Jul 21, 1970Penn Ventilator Co IncBase for roof mounted devices
US3602530 *Feb 17, 1969Aug 31, 1971Multi Flashings IncFlashing for roof vent pipes
FR1307295A * Title not available
GB971124A * Title not available
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3866950 *May 21, 1973Feb 18, 1975Versatile Ind IncMulti-size adapters
US3871145 *Apr 5, 1973Mar 18, 1975James W HatmakerFlashing for pitch pocket
US4010578 *Nov 11, 1974Mar 8, 1977Logsdon Duane DRoof flashing structure
US4120129 *Sep 1, 1976Oct 17, 1978The Pate CompanyPipe flashing unit
US4158471 *Mar 27, 1978Jun 19, 1979The Logsdon FoundationWashing machine outlet box
US4333660 *Mar 3, 1980Jun 8, 1982Cupit George MSeal device for pipe projecting through roof
US4563847 *Jun 17, 1982Jan 14, 1986W F Products CorporationUniversal flashing for roof vent pipes
US4768812 *Nov 2, 1987Sep 6, 1988Multi-Flashings, Inc.Flashing for roof vent pipes
US5010700 *Jul 23, 1990Apr 30, 1991Earl BlairRoof jack
US5036636 *Jan 18, 1989Aug 6, 1991Hasty William EElastomeric collar
US5222334 *Jun 11, 1991Jun 29, 1993Hasty William EMultiple size vent-pipe elastomeric collar
US5286040 *Apr 12, 1993Feb 15, 1994Gavin Norman WAsymmetrical pipe seal and closure member
US5624123 *May 11, 1994Apr 29, 1997Tuf-Tite, Inc.Pipe seal assembly for poured concrete on-site waste disposal system components
US5711536 *Sep 11, 1996Jan 27, 1998Tuf-Tite, Inc.Seal component for use in on-site poured concrete or plastic tank or box components of fluid distribution systems
US6163960 *Nov 27, 1998Dec 26, 2000Poitras; MichelStatic ventilator including a corrugated portion
US7775005Oct 24, 2007Aug 17, 2010Johnston Lorne GVent pipe covering system
US7814709Dec 17, 2009Oct 19, 2010Resech Ronald WPipe boot
US8453389 *Aug 4, 2011Jun 4, 2013Bruce A. SelkeRoof boot
US8484914 *Jun 21, 2010Jul 16, 2013Roger M. ClineSealing system
US20110000154 *Jun 21, 2010Jan 6, 2011Cline Roger MSealing system
US20120031024 *Aug 4, 2011Feb 9, 2012Selke Bruce ARoof boot
DE2949956A1 *Dec 12, 1979Jun 19, 1981Werner Ing Grad EsslingerUniversal-dachdurchfuehrungsabdeckplatte
EP0209491A1 *Jul 7, 1986Jan 21, 1987Dübi & Co.Roof enclosure for vent pipes or exhaust chimneys
EP1582648A1 *Mar 14, 2005Oct 5, 2005Dakota Metal Plastic Works LLCValley/Flashing for flues
WO1985004923A1 *Apr 19, 1985Nov 7, 1985Aquarius Rubber Pty LtdA seal device and method of producing same
WO1991000399A1 *Jun 29, 1990Dec 31, 1990Earl BlairRoof jack
Classifications
U.S. Classification285/3, 285/44
International ClassificationE04D13/14, E04D13/147
Cooperative ClassificationE04D13/1476
European ClassificationE04D13/147D2
Legal Events
DateCodeEventDescription
Nov 2, 1987AS02Assignment of assignor's interest
Owner name: MULTI-FLASHINGS, INC., 27036 JOHN R STREET, MADISO
Effective date: 19871027
Owner name: ROYAL SEVEN, INC., A MI. CORP..
Nov 2, 1987ASAssignment
Owner name: MULTI-FLASHINGS, INC., 27036 JOHN R STREET, MADISO
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:ROYAL SEVEN, INC., A MI. CORP..;REEL/FRAME:004832/0997
Effective date: 19871027
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:ROYAL SEVEN, INC., A MI. CORP..;REEL/FRAME:4832/997
Owner name: MULTI-FLASHINGS, INC.,MICHIGAN
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:ROYAL SEVEN, INC., A MI. CORP..;REEL/FRAME:004832/0997
May 6, 1985ASAssignment
Owner name: MULTI FLASHINGS INC., A CORP OF MI
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:ROYAL SEVEN, INC.;REEL/FRAME:004397/0339
Effective date: 19850301
May 6, 1985AS02Assignment of assignor's interest
Owner name: MULTI FLASHINGS INC., A CORP OF MI
Owner name: ROYAL SEVEN, INC.
Effective date: 19850301