US3168780A - Method of making roof ventilator - Google Patents

Description

Feb. 9, 1965 G. M. BREIDERT 3,168,780

METHOD OF MAKING ROOF VENTILATOR Filed Nov. 26, 1962 .2 a 5 650/2 5 M .BPE/DEQ 7' IN VEN TOR.

ATTOQNEYS United States Patent 3,168,7dtl MEIR-ill) @h MAKENG R091 VENTILATGR George M. 'Ereidert, Granada Hills, tlmiii, assignor to The G. C. Breidert Co., San Fernando, Calii, a corporation of California Filed Nov. 26, 1962, Ser. No. 2%,tl85 1 Ctaim. (Cl. 29-455) This invention has to do with the art of roof ventilators and relates more particularly to a novel method of making a roof ventilator. This application is a continuation in part of my copending application, Serial No. 64,864, filed October 25, 1960, now abandoned.

Conventional roof ventilators consist of a relatively large number of parts which must be separately manufactured and, therefore, for their manufacture, many different dies are required, which renders the n1anufacturing costs rather high.

It is therefore an object of my present invention to provide a method of manufacturing a roof ventilator which method requires a minimum number of parts and dies and which therefore substantially reduces the manufacturing costs, enabling the ventilator to be sold at a relatively low price.

Other objects and advantages will appear hereinafter.

While I shall point out in the appended claim the method which I believe to be new, I shall now, by way of example, explain in detail my presently preferred method, for which purpose I shall refer to the accompanying drawing, wherein:

FIG. 1 is a side elevational view of a ventilator embodying my invention;

FIG. 2 is an enlarged view, like FIG. 1, except that some parts are shown in section and some are shown in elevation;

FIG. 3 is a sectional view illustrating one step of my method;

FIG, 4 is a sectional view illustrating other steps of my method; and

FIG. 5 is a sectional view illustrating another step of my method.

The end product of my method is a roof ventilator generally denoted in the accompanying drawing by the numeral 5, comprising a base or bottom portion 6, a top portion 7, a surrounding baffle member 8 of concavoconvex cross section, and bolts 15 and spacer sleeves 17 for retaining the upper and lower parts in vertically spaced relationship and for securing the annular baflle member in spaced surrounding relationship to the upper and lower portions of the ventilator.

It will be noted that the bottom or base 6 has a dishshaped portion 6a, an annular neck portion 612 and a curved transitional portion 60, while the upper portion 7 has an inverted dish shape presenting a frusto conical side portion 70 and a flat top portion 712.

The annular battle member is composed of a lower half 80 and an upper half 812, each of which halves, in cross section, is generally concavo convex, and has a radially outwardly disposed edge flange 8c. The flanges 8c are secured together, as by welding, to form an annular bead 19.

The equidistantly spaced bolts 15 extend through corresponding holes in bafile portions 8a and 3b, through portions 6 and 7, and through spacer sleeves 17 interposed between the bafile portions and the lower and up per portions 6 and 7. Consequently the bolts and spacer sleeves not only maintain the lower and upper portions 6 and '7 in vertically spaced relationship to provide an air outlet 20 between their peripheral portions, but also maintain the baffle member 8 in radially spaced relationship to the portions 6 and '7 whereby to provide an air passageway 20a.

The peripheral portions of each of the lower and upper positions 6 and 7 terminates in a downturned bat'lle flange in use, the neck 6b is placed in communication with an air outlet duct of a building or the like extending through the building roof and winds passing around the ventilator as well as between the battle 8 and the upper and lower portions 6, 7 siphon air from the building through outlet 20.

My method of making the ventilator is as follows:

I first form, as by conventional stamping or spinning, two duplicate parts 7 as shown in FIG. 3. In the finished ventilator one of those parts constitutes the upper part 7 of the ventilator, and the other part, after slight alteration as will be described, eventually forms the lower part of the ventilator. I also form, by conventional stamping or spinning, two duplicate annular parts 8a, Sb of concavo convex cross section, which parts are thereafter assembled as will be hereinafter described, to form the bafile member 8.

I then, as shown in FIG. 3, cut out the central portion 7b of one of the formed parts 7, which I do by any suitable well known cutting tool, leaving an opening 11 (FIG. 4) in said part. Next I form, as by spinning, the conoidal portion into a cylindrical neck 61) as shown by the broken lines in FIG. 4. When one of those parts 7 is thus altered, it becomes as shown in FIG. 5 and constitutes the lower portion 6 of the finished ventilator.

After thus forming the duplicate part 7, altering one of those parts as described, and after thus forming the duplicate parts and 30 as described, I assemble the duplicate parts 8b and 8c together by welding the flanges 8c together and secure the thus formed bafile member to the thus formed parts 6 and 7 by means of the bolts 15 and spacer sleeves 17, and the ventilator is then in assembled condition ready for installation. It will be seen therefore that my method requires only one die for forming the duplicate parts 7 and one die for forming the duplicate parts 8a and 812.

I claim:

The method of making a roof ventilator which comprises the steps of:

(a) Forming two duplicate dish-shaped members,

(b) removing the medial portion of one of said members whereby to provide a central opening therethrough,

(c) forming the part of said last mentioned member bounding said opening into a cylindrical shape,

(d) forming two duplicate annular elements of concavo-convex cross section, each having a radially disposed annular edge flange,

(e) securing said flanges together whereby to form said annular elements into a single 'bafiie member of substantially concavo-convex cross-section,

(f) arranging said first mentioned members in vertically spaced, opposed relationship whereby to provide an air outlet therebetween,

(g) arranging said baffle member in radially spaced surrounding relationship to said first mentioned members, whereby to provide an air passageway therebetween, and

(h) securing said members in said relationship.

References Cited in the file of this patent UNITED STATES PATENTS 174,304 Robinson Feb. 29, 1876 509,593 Brown Nov. 28, 1893 637,863 Gavin Nov. 28, 1899 1,966,713 Flint July 17, 1934 2,869,228 Martin Jan. 20, 1959

Images