US 1512672 A
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. och 21 1924. 1,512,672
F. D. BLAUVELT ROOF FLANGE Filed. April 1, 1922 I N VEN TOR.
Patented Oct. 21, 1924.
UNITED STATES FREDERIC D. BLAUVELT, OF GLEN RIDGE, NEW JERSEY.
Application filed April 1, 1922.
To all whom it may concern:
Be it known that I, FREDERIC D. BLAU- VELT, a citizen of the United States, residing at Glen Ridge, in the county of Essex and State of New Jersey, have invented certain new and useful Improvements in Roof Flanges, fully described and represented in the following specification and the accompanying drawings, forming a part of the same.
This invention relates to roof flanges for making a watertight joint between a roof and a pipe projecting therethrough.
An object of the invention is to provide an improved article of this character which may be manufactured at small cost, which has the requisite strength and flexibility where needed, and which may be used upon roofs which are inclined at different angles.
A roof flange embodying the invention comprises a sheet or plate to be placed upon the roof and containing an elliptical hole, a frusto-conical boot extending upwardly from the periphery of the hole, and a flange at the upper end of the boot adapted to form a stuffing box. The flange and boot are formed of a single piece of soft metal, such as lead. This has the advantages of economy in manufacture, avoiding danger of leaks, and permitting a change in the form of the boot as well as the flange to flt on pipes at different angles to the rooflate.
p Other features and advantages of the invention are hereinafter explained in con nection with a detailed description of the embodiment of the invention which is illustrated in the accompanying drawings, in which Fig. 1 is a side elevation of the roof flange sectioned on the line 1-1 of Fig. 2 and showing the application of the article to a pipe extending through a roof inclined at an angle of about 22 Fig. 2 is a plan view of the roof flange;
Fig. 3 is a fragmentary section taken on the line 11 of Fig. 2 and showing the form of the flange before the article is applied to a pipe;
Fig. 4 is a side elevation partly sectioned on the line l1 of Fig. 2 showing the application of the article to a pipe extending Ill) Serial No. 548,706.
through a roof inclined at an angle of l5; and
Fig. 5 is a similar view showing the ap f The roof-plate 10 consists of a sheet of 'I' metal, and most desirably of sheet lead. In it is formed an elliptical hole. The portion of the plate surrounding the hole is turned up to form a lip 11.
The boot 15 and the flange 20 are formed '1- from a single piece of soft metal. I have found lead to be the most desirable metal for this purpose. The boot and flange are best made as follows:The lead of which they are to be formed is first forced through an orifice shaping it into a hollow cylinder having a diameter equal to that of the neck 16 of the finished article. The hollow cylinder thus formed is then rotated about its axis and pressed outwardly against an external form giving the portion of it below the neck 16 a frusto-conical shape with the sides extending most desirably at about 22 to the principal axis of this frustoconical portion, and the portion of it above the neck 16 an outwardly bulging shape to form the flange 20. In this operation the portion of the hollow cylinder which is formed into the flange 20 retains substantially its original thickness, while the thick- I ness of theportion of the cylinder which is given the frusto-conical shape is decreased as its diameter is increased. The frustoconical portion is then cut ofl on a plane at an angle of to one of its sides to form the boot 15 of the shape shown.
The forming of the boot and flange from pressed lead as described, instead of forming it of cast metal, gives the article a num ber of advantages. The article may be made of uniform strength and thickness throughout any circumference, notwithstanding the fact that it may be made very thin so that only a comparatively small amount of lead is used. The decreased thickness of the boot towards its bottom gives suflicient strength to this part of the article with a minimum use of material, while the flange is thicker to have suflicient strength to permit of driving