Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Impact driven fastener – e.g. – nail – spike – tack – etc. – Plural attached fasteners
Patent
1987-05-14
1990-05-15
Wilson, Neill R.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Impact driven fastener, e.g., nail, spike, tack, etc.
Plural attached fasteners
411464, 411478, F16B 1508
Patent
active
049253522
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to sheet nails linked side-by-side with each other in a metal band or sheet-metal strip, e.g. so-called sheet nails in strips, where the nails are parallel to each other and extend at an angle or perpendicular to the longitudinal direction of the strip from one lateral edge of the strip to the other opposite lateral edge, said sheet nails having a profiled nail shank which is provided at one end with a head.
BACKGROUND OF THE INVENTION
In industrial, mechanized nailing, e.g. the nailing together of pallets with the aid of more or less automated nailing machines or nailing devices, the nails must be supplied to the fastening mechanism of the machine or device from a magazine or be supplied in the form of a feed band to enable the nailing to be effected at the desired high speed and without the risk of break-down or other work stoppage.
The most reliable method of continuously supplying nails to the nailing machine has proven to be loading the machine with strip nails either in the form of separate nails fixed onto/in a belt or linked sheet nails formed in a sheet-metal strip, which are separated one at a time in the machine from the rest of the strip or belt and are driven into the pieces to be nailed together.
The technique of using still interconnected sheet nails which are rolled or stamped for example in a sheet-metal strip is clearly superior to using nails fixed onto/in a belt since loading the belt with the individual nails is expensive and presents the problem of disposing of waste in the form of empty belts after nailing.
It is true that known types of sheet nails in strips have been able to be manufactured at relatively low cost, but their performance as fasteners has not been satisfactory in all respects.
The strength of these sheet nails has for example often been unsatisfactory, especially in the transition portion between the nail shank and the flat (smooth) head. Furthermore, the known sheet nails in many cases do not provide the desired straight penetration by the nail shank when the nail is driven in. It is also a well known fact that the risk of cracking is relatively great for these known types of sheet nails. The primary purpose of the invention is therefore to achieve a new improved type of sheet nails in strips, which have better strength properties than known sheet nails and also enable the nail to be driven in straight. An additional purpose is to achieve a sheet nail which provides substantially less risk of cracking and splitting during nailing than for previously known sheet nails.
SUMMARY OF THE INVENTION
According to the invention this is achieved by the transitional portion between the profiled shank and the nail head consisting of a bent portion which is also profiled, and by the head being profiled as well and being not wider than the shank, the nail end remote from the head having a penetration portion with at least one edge, cross-cut edge surface or point.
With a sheet nail made in this manner, increased strength is achieved by virtue of the fact that the nails are profiled along their entire length, i.e. not only along the shank but also at the transitional portion and the head. By profiling the head, its surface will be greater than the surface of a corresponding flat head. In addition to increasing the strength in the profiled bent portion and in the laterally extending portion, increased bending stiffness can be achieved in the nail shank since the "profile angle" can be as small or smaller than 90.degree. without making the manufacture of the strip nails more difficult. The improved strength and stiffness along the entire length of the nail due to the high degree of corrugation, make it possible to achieve the desired straight driving in of the nails. Good tensile strength, shear strength and good grip are achieved due to the improved strength of the upper portion of the nail, the greater surface and the profiled shape.
The parallel nails in the strip can be oriented so that they form a right angle or an acut
REFERENCES:
patent: 1465783 (1923-08-01), Polzer
patent: 2033613 (1936-03-01), Crosby
patent: 2235300 (1941-03-01), Ramey
patent: 2314481 (1943-03-01), Crooks
patent: 2651232 (1953-09-01), Lang
patent: 3072008 (1963-01-01), Lang
patent: 4167885 (1979-09-01), Paskert et al.
Nordisk Kartro AB
Redman Jerry
Wilson Neill R.
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