US1940534A - Roofing nail - Google Patents

Description

Patented Dec. 19, 1933 UNITED STATES PATENT OFFICE 1 Claim.

In the present invention I provide a roofing nail designed to positively prevent casual displacement of the nail from the roofing materials when the latter expand.

It is well known in the art that roofing nails become loosened in the roofing material in a relatively short period of time and since these nails are necessarily of short length, their effectiveness is manifestly impaired unless the nails are periodically redriven into the roof. With the present nail, a permanent fastening means for the roof is provided, which will not loosen or become displaced regardless of atmospheric or weather conditions.

A further object of the invention is to provide a roofing nail with an enlarged entering terminal, the margins of which are interrupted to provide work-engaging protrusions.

Other objects of the invention will be apparent from the following description of the present preferred form thereof, taken in connection with the accompanying drawing, wherein Fig. 1 is a side'elevational view of a roofing nail, constructed in accordance with the present invention, illustrating its application, the face of the nail being shown.

Fig. 2 is a similar view, looking at the edge of the nail; and

Fig. 3 is a perspective view of a roofing nail, per se, constructed in accordance with the present invention- In order to illustrate the application of the present invention, I have shown a portion of a roof 4 composed of the usual beams or timbers, with roofing material superimposed thereon. It is well known at the present time that the roofing material is secured by relatively short nails having shanks circular in cross-section, the peripheries of which are roughened or serrated. The nails are driven through the roofing material into the supporting beams or timbers in a manner well-known in the art. In the present invention. the nail is used in the same manner by being driven through the roofing material and into the supporting beams of the roof, to which latter the nail is locked to prevent accidental withdrawal of the nail.

As illustrated to advantage in Fig. 3, the shank 5 of the nail is circular in cross-section and is provided at one end with a head 6, while the opposite end is flattened to provide a substantially wedge shaped entering terminal '7. Said terminal 7 has the lateral margins thereof intermediately interrupted by incisions or recesses 8, one of which is formed in each side of said terminal. Preferably, each incision is disposed obliquely to the longitudinal axis of the nail and a portion of each side of the nail projects outwardly from a wall of each incision to provide a lateral protruding tooth or terminal 9. Consequently, when the nail is driven into the roof, as shown in Figs. 1 and 2 of the drawing, the protrusions 9 will be imbedded into the roof beam or timber.

After the nail of the present invention has been completely driven into the roof as shown in Figs. 1 and '2, I have found that it cannot be removed from the roof with a pulling pressure in excess of four and three-quarter pounds, whereas an ordinary roofing nail can be removed with a pulling pressure of approximately one and three-quarter pounds. While the nail of the present invention is especially adapted to replace roofing nails which have been casually displaced in that the nails of the present invention may be driven with facility into the openings, or recesses formed by the displaced nails, it is of course, to be understood that the nail of the present invention may also be used in new work." The pointed entering terminal of the nail with the relatively large head commonly employed in roof-. ing nails makes driving of the nail into the material possible without much more resistance ed entering terminal, said curved margins hav- 7 ing incisions therein disposed obliquely to the long axis of the shank, the lower wall of each incision projecting beyond the upper wall of the latter to provide an upwardly extending tooth.

EDWARD CAUGHLEY.

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