US1321958A - wardell - Google Patents

Description

H. R. WARDELL.

ROOFING CLAMP.

APPLICATION FILED SEPT 20, 'I9I5- RENEWED MM. 15. WW.

l 3% 1,95 81. mam-m NW. W, 1919.

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t l l l W HENRY 1t. WARIDlElJlZ-fOF CHICAGO, ILLINUIS, ASSIGNOR, ItlllllPihl'lEl Atlfiltfirlll'lltlldll'lfi, lltl H. W. JOHNS-MANVILLE COMPANY, it CORPORATION or Nlllllv HOME.

I ROOFING-CLHHWP.

specification. of Letters Patent.

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Application tiled September 20, 1916, serial No. 1213M. lEte'newed May 15, 1919; lserial l lo. .rltllfltlfi.

To all whom it may concern Be it known that I, HENRY ll. lVAnonLL, a citizen of the United States of America, residing at Chicago, in the county of Cook and Eitate of lllinois, have invented certain new and useful Improvements in Roofing- Clamps, of which the following 1s a spec1haction.

My invention relates'to means for tastening flexible roofing to the roofs and sides of,

buildings and consists of an improved form of metal clamp which may be, nailed to the root boards or sheathing of the building, firmly clamping the different sheets of root ing materialtogether at their overlapping edges and tothe building. In cleats of this type, the object is to produce as binding a ,grip on the flexible roofing fabric as possible bothat and between the nailing points, and to accomplish this result with as thin a metal strip as possible, so as to reduce, as much as possible, the costot material, the consumption of power in the presses used to stamp out the cleats, and the wear on the dies so employed. Heretotore, various structures cessful to a degree in accomplishing the desired result, they have required complicated forms of dies which have worn out quite rapidly, so that after a period of use ofthe dies, the cleats stamped outlost their correctness of shape, and also the raised arches and corrugations presented an obstruction to the flow of Water over the root. My present invention overcomes these difficulties and also-produces aclamp which has no sharp edges cutting into the roofing. The best form of damp at present known to me embodying my invention is illustrated in the accompanying sheet of drawings, in which- Figure l is a plan view pt the simplest form of clamp;

Fig. 2 is a-longitudinal, vertical section, taken on line 2-43 of Fig. 1;

Fig. 3 is a cross-section taken on line 8-3 of Fig. 1;

Fig. t is a plan view of a modification, and

Fig. 5- is a side elevation of either torn].

the roofing tabric being shown in cross-sec-- tion, and. the upper one in edge elevation.

Throughout the drawings like referencef characters indicate like parts. 1 1s a thin strlp of metal, prctcrably mild steel, which is usually stamped out of a sheet of steel with a plurality of nailing domes 2, 2, forced up trom the body of the strip, and centrally perforated for passage of nails at 3, These domes are centered substantially along the medial line of the clamp. in the same stamping operation, the flat portions of the strip between the nailing domesare given a curvature or dip downward, as shown at d, -Zl-, but retain their rectilinear cross-scction, as shown in Fig. 3. in Fig. 5, the clamp is shown as applied .to roofing. it, is a portion ct root board or sheathing of a building, 15 is the under layer oi roofing fabric, shown in cross section and 1G is the edge oil: the upper layer oi rooting :lahric, which has been overlapped on 15 to form a seam or oint, l he clamps are usually placed along the tops of these seams, the nails 5, passing through clamps and both. layers oi rooting fabric, The downward pressure at the nailing domes, resulting from nailing the clamp down, partly deforms the curved sections 4-, t but, as the ends of these curved sections are confined against much longitudinal movement by the nails 5, 5 at either end, it said nails are drivenv straight downward, the curved sections 4:, l, are generally compelled to retain at least a slight portion of their origi nal curvature, even at the end of the nailing operation, as shown in Fig. 5.

In the, modilication shown in Fig. l, l employ a metal strip ll, having curved edges, so arranged that the strip is wider at points 12 '12, intermediate of the nailing domes than it is at the junctures with the dome portions. lit the curved wave line of each clamp side is made symmetrical with respect to an axis parallel to the major-axis oi the clamp, such as the dotted line 13--13, a series or the clamps can be stamped out of a sheet without any waste of material,

the convex portion of the edge of one clamp' fitting into the concave portions of the edge of the next clamp,

in operation, any two nails, as 5, 5, con-- ottsrpia till fine the particular downwardly bowed or curved section 4, of the strip between them and drive or thrust it down upon the roofing beneath with a powerful clamping action,

pressure is applied being all in the substantially medial line of the clamp, there is no chance'for the intervening downwardly bowed portions of the strip forming the clamp to twist or turn or spring to one side and thereby avoid wholly or in part the transmission of the nailing pressure. On the contrary they are rigidly held in the line of said nailing pressure and by it are positively driven or clamped down on to the roofing.

In the modification shown in Fig. 4, the greater width of metal at the downwardly curved parts 1-2, 12, gives greater stiffness and allows still less opportunity for the strip to buckle up when compressed by the nail thrust.

If by any chance, one of the nails, while being driven down,bends sidewise under the reaction of the curved portion of the strip, then being placed under compression, so that said curved portion has a chance to straighten out completely instead of having its curvature only partially reduced by the nailing pressure, the spring action of the distorted strip still affords strong pressure upon the roofing beneath. As a result, the roofing fabric is firmly compressed at all points by direct pressure under the nailing domes and by transmitted pressure under the intermediate sections of the clamp. There are, however, no cutting edges forced into the roofing fabric, no continuous ridge or clamp arch is formed to hold back flowing water, and there are no highprojections to be struck by a shovel, when cleanin snow off the roof.

T-Iaving thus described my invention, I claim:

l. A clamp for fastening prepared roofing and the like, consisting of a flat strip of metal having a series of properly spaced, perforated nailing domes centered along the substantially medial line of the clamp, the sections between the domes being curved or bowed downward throughout.

2. A clamp for fastening prepared roofing and the like, consisting of a strip of metal having a series of properly spaced, perforated nailing domes, centered along the substantially medial line of the clamp. the sections between the domes being curved or bowed downward throughout, but of rectilinear cross section.

3. A clamp for fastening prepared roofing and the like, consisting ofa flat strip of metal having a series of properly spaced,

perforated nailing domes, centered along the substantially medial line of the clamp, the sections between the domes being curved or bowed downward throughout and having greater width at their mid portions than at their junctures with the dome portions of the clamp.

A clamp for fastening prepared roofing and the like, consisting of a flat strip of metalhaving a series of properly spaced, perforated nailing domes centered along the substantially medial line of the clamp, the sections between the domes being curved or bowed downward throughout, and having greater width at their mid portions than at their junctures with the dome portions of the clamp, the side edges of the clamp forming wave lines each symmetrical with respect to anaxis parallel to the major axis of the clamp.

HENRY R. VVARDELL.

A. J. ARIEL.

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