US515156A - Box-fastening - Google Patents

Description

(No Model.)

N. NILSSON. BOX FASTENING.

N0. 515,156. Patented-Feb. 20, 1894.

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NKTE STAT S NILS NILSSON, OF BROOKLYN, NEW YORK.

BOX-FASTENING.

SPECIFICATION forming part of Letters Patent No. 515,156, dated February 20, 1 894.

Application filed January 28,1892. Serial N0.4=19.506, (No model.

To aZZ whom it may concern.-

Be it known that LNILs NILSSON,asubject of the King of Sweden and Norway, and a resident of Brooklyn, in the county of Kings and State of New York, have invented certain new and useful Improvements in Box-Fastenings, of which the following is a specification.

My invention relates to the kind of metallic box fastening that consists of a thin flat metal strip having two or more barbs or points formed at the extremities, and bent at right angles to the strip in the form of along staple having two prongs at each end, and it consists in improved construct-ions of said fasteners whereby better and more substantial barbs are produced as hereinafter fully described reference being made to the accompanying drawings in which Figure 1, is a plan view of two fasteners of my invention as they appear after being cut to form the barbs, but before the barbs have been bent, said figure indicating the mode of producing such fasteners from a continuous strip of metal in a simple manner and without waste of material. Fig; 2, is a side elevation of the same as they appear after the barbs have been bent.

The said improved fastener consists essentially of a short fiat strip a, of metal having two or more barbs b,b, at each end,one in advance of the other about the length of abarb or thereabout, and bent at right angles to the body of the strip, making a long staple with two or more prongs at each extremity for being driven into the wood on opposite sides of a joint between the edges of two boards, or on the different sides of a corner.. Such strips have been made heretofore wit-h the barbs cut taper on one edge, but I have observed that such taper barbs do not have very secure hold .in the wood andI therefore produce the barbs with both edges parallel for the most part of their length, and with a short taper point thus making barbs that hold much better. The barbs b are thus produced by making the slit 61, along the center of the strip and parallel with the edges about the length of a single barb, and then making the shortdiagonal cuts e, in the opposite edges of the strip at equidistant points about thelength of a barb from the ends of the said central slit respectively to separate the blanks and shape the points.

This mode of cutting differs from that by which the taper edged barbs are produced in that the center slit for such barbs is twice the length of a barb, and the parting cut is in a straight diagonal line extending along the strip longitudinally the same distance as the center slit and crossing said slit at the center.

It will be seen that besidesthe better holding power of parallel edges there is nearly double the amount of metal in the barbs as I make them, and they have the like greater side surface embedded in the wood with correspondingly greater holding power, besides the greater stability due to the greater quantity of metal. This will be manifest when it is observed that these barbs of my improvement contain about one third more metal than the taper barbs of the common form. I have also observed another weak point in these fasteners as commonly made which is in the lack of strength in the bonds of the barbs, as the barbs b of the greatest extremities of the fasteners, which being limited in width at the bends are liable to straighten more or less under great stress and thus draw out of the wood more easily than if more rigid, which I avoid by cutting the strip so as to retain an integral base to the said barbs b the whole width of thestrip as g, in Fig. l, in which to form the bend fso that part of said wide base will be driven into the wood along with the rest-of the barb. This may be done by cutting slit (1, only the length of one barb or a little less and separating the strip at the extremities of said slit by the diagonal cuts 6, as before stated and cutting barbs I) back of the base g independently of barbs b, with base 9 as a base thereto, by a diagonal and longitudinal cut it, '6, made independently of the other cuts producing barbs b.

By cutting the barbs b with the base g, as the base thereto also, and bending them toward barbs b, they are stronger in the bent portion than when bent the other way, and will resist pulling out to a greater extent, which is important in cases where the box spreads apart between the ends of the fasteners, or the middle portion of the fastener is thrust up or away from the surface of the box, and another advantage is that owing to the weakness of the strip in the parts from which the barbs b are cut it will bend thereat when the other barb behind the first and the two barbs of each extremity joined base to base substantially as described.

so thrust upward along the middle portion and having less power as a lever will not pry the barbs out as when the strip has its full strength inside of the barbs.

I claim as my invention The improved staple shaped box fastener having two barbs at each extremity, each about half the width of the strip, one a little York and State of New York, this 4th day of January, A. D. 1892.

NILS NILssoN,

beyond the other and havingits base junction Witnesses: with the strip wider than the width of the W. J. MORGAN, barb and being bent in the Wider base, and W. B. EARLL.

Signed at New York, in the county of New :5 i

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