US1424566A - Roof and the like covering - Google Patents

Description

W. H. GRIFFITHS.

ROOF AND THE LIKE COVERING. APPLICATION FILED APR. 14. 1922.

Patented Aug. 1, 1922.

ROOF AND THE LIKE COVERING.

Specification of Letters Patent.

Patented Aug. 1, 1922.

Application filed April 14, 1922. Serial No. 552,555.

To all whom it may concern:

Be it known that I, WVILLIAM HARRY GRIF- FITHs, a subject of the King of Great Britain, residing at Hereford, England, have invented certain new and useful Improvements in and Relating to Roofs and the like Coverings, of which the following is a specificationL The present invention relates to improvements in and relating to roof and the like coverings, and being particularly applicable to sheet-metal, especially corrugated-iron, roofings, it will be hereinafter described in that application.

Galvanized or corrugated iron roofing is open to the objection of making the barn, shed, or other building, hot, dark, and ill ventilated.

The object of the present invention is to overcome these disadvantages by using c0v ering sheets or plates so perforated as to admit light, to allow heated air and moisture, for example, steam in engine sheds. to pass off, and yet be proof for all or most practical purposes against the entrance of rain.

To these ends the present invention broadly consists in the manufacture and use of roofing or the like sheets or plates with small holes or narrow or slit-like openings which remain uncovered in use and which are so constructed that only a fine mist or spray can find entrance even in a heavy rain.

More particularly the present invention consists in perforating metal sheets or plates with small holes or narrow or slit-like openings, the perimeters of which are raised or bulged outwards and conveniently and advantageously sloping towards each other like the wall of a conical projection or a V- shaped rib raised up on the sheet or plate, the metal at or along the top of the projection for the purposes of the present invention being pierced or severed rather than punched out.

Thus the sides of the perforations tend to form rain uards and to shed the rain.

In application to corrugated iron, the lines of openings will preferably be in the direction of and at the tops of the folds, this position at the top of the folds ordinarily ensuring that there is little or no dwell of water in the vicinity of the openings.

For forming the openings, slender chisellike cutters or piercing cutters or punches will serve with appropriate counter parts or bolsters shaped to allow of the raising or bulging of the perimeters.

By an appropriate system of rotary cutters or piercers and counterparts, the open-' ings may be cut or pierced during the rolling of the sheets.

In the accompanying drawings there is shewn two examples of perforated metal sheets or plates according to the present invention.

Fig. 1 is a plan view of a part of a sheet or plate having narrow slit-like openings, the lines of openings being arranged in the direction of and. at the tops of the folds. Fig. 2 is a section of a corrugated sheet or plate.

Fig. 3 is a plan view of part of a corrugated sheet or plate having small holes.

Referring to Figs. 1 and 2 of. the drawings a corrugated metal sheet 1 has narrow slitlike openings 2 therein. The openings 2 are in the direction of and at the top of the folds As is shewn in Fig. 2the perimeters 4 of the openings 2 are raised or bulged outwards and slope towards each other, the metal at or along the top of the projection being pierced or severed.

In Fig. 3 there is illustrated a construction of metal sheet or plate 5 having small holes 6 in place of the narrow slit-like openings shewn in the previous figures.

lVith corrugated sheets so perforated with cuts or slit-like openings with raised or bulging sides, the rain drops split on the cut and run down the folds, and in heavy rain, the wet that finds entrance is but a faintly perceptible mist or spray drift which is ordinarily absorbed by the air in the building, or has no more wetting power than fog.

As an example of lay out it has been found that a corrugated sheet having narrow slitlike openings of about .03" in width works well, though this width may be increased especially if the edges of the slit are raised. The length and number of the slits depend on the strength of the roof and amount of ventilation, etc., desired, but with slits of the width mentioned a length of 1 to 1% with about half an inch intervals between the ends of the slits, which are arranged at the tops of the corrugations would generally be a suitable arrangement.

In an actual temperature test it was found that where a building was covered partly with sheets made as herein described a thermometer placed under and touching the terial as being used for roofing, the plates made as herein described can also be used for the protection of other parts of buildings, sheds, tents, etc.

What I claim is 2-- 1. As an article of manufacture a sheet metal roofing-plate comprising a sheet having small openings therein, with an upstanding perimeter to each of said openings, for the purposes described.

2. As an article of manufacture a sheet metal roofing-plate comprising a sheet having small openings therein with an upstanding perimeter to each said opening, said perimeter sloping towards the centre of the opening, for the purposes described.

3. As an article of manufacture a sheet metal roofing-plate comprising a corrugated sheet having lines of narrowslit-like openings arranged in the direction of and at the top of the folds of said sheet, with upstanding perimeters to the openings, the perimeters of each opening sloping towards the centre thereof for the purposes described.

4. As an article of manufacture a sheet metal roofing-plate comprising a corrugated sheet having lines of holes arranged in the direction of and at the tops of the folds of said sheet, the perimeter of each hole being upstanding and sloping towards the centre thereof, for the purposes described.

5. As an article of manufacture, a sheet metal roofing plate having small openings therein of such a size as to normally prevent the direct entrance of rain drops, but to admit light and to permit the escape of air or other gas or vapor, the sides of said openings being raised above the main body of the sheet. 7

6. As an article of manufacture, a sheet metal roofing plate having narrow slits therein of such a width as to normally prevent the direct entrance of rain drops, but to admit light and to permit the escape of air or other gas or vapor, the sides of said slits being raised above the main body of the sheet.

7. As an article of manufacture a sheet metal roofing plate comprising a corrugated sheet having small openings along the tops of the corrugations,such openings being of such a size as to normally exclude raindrops, but to admit light and to permit the escape therethrough of air or other gases or vapors.

8. As an article of manufacture a sheet metal roofing plate comprising a corrugated sheet having very narrow slits along the tops of the corrugations, such slits being of such a size as to normally exclude raindrops, but to admit light and to permit the escape therethrough of air or other gases or vapors.

In testimony whereof, I aflix my signature.

WILLIAM HARRY GRIFFITHS.

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