Elongated-member-driving apparatus – With interlock means
Patent
1987-12-01
1988-09-06
Bell, Paul A.
Elongated-member-driving apparatus
With interlock means
227116, B25C 104
Patent
active
047686960
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an arrangement for advancing a strip of nails or equivalent fasteners into, and holding the nail strip in the nail-driving section of a nail driving tool, for example a nail gun, provided with a safety-catch device and a nail strip magazine, and which arrangement includes means for separating the nails or like fasteners from the strip one at a time, and for driving the nails thus separated into a workpiece to be nailed. It will be understood that by nail strip is meant here and in the following appendages of nails or like fasteners mutually held in side-by-side spaced relationship, or strips of nails and like fasteners formed integrally with one another in contiguous side-by-side relationship to form a continuous integrated single piece structure. It will also be understood that the nails or like fasteners may be made of any suitable material, preferably sheet metal.
The use within manufacturing industries of automatic nailing machines or like apparatus, of varying degrees of automation, for the mechanized nailing of goods has increased in recent years. In machines/apparatus of the nature referred to the nails are normally taken from a magazine, or may in themselves form a magazine, in a manner which enables nailing to be effected continuously, with short intervals between consecutive nail driving sequences, without risk of interruption in operation.
When the nails fed to the machine/apparatus are in the form of "banded" appendages, they are normally held in or on a nail carrying strip in uniform spaced relationship therealong, or may have the form of a coherent strip of contiguous, mutually connected nails formed integrally with or incorporated in a metal band or sheet-metal strip. The machine (apparatus) strips the nails from the nail strip one at a time and drives the separate nails into the workpiece.
It has been found in practice that nails formed integrally to provide a sheet-metal strip (hereinafter referred to as "integrated nails") are often to be preferred to nails which are fastened in or attached to a carrier tape or band, since such "nail-loaded carrier bands" are, among other things, more expensive to produce and require the carrier band to be loaded with nails. In addition, the carrier-band residues remaining when all nails in the band have been used create waste.
An example of banded integrated nails is found described and illustrated in Swedish Patent Application No. 8504557-3.
The present invention thus relates to an arrangement of the aforesaid kind, used in nail driving apparatus loaded with nails in strip form.
When manufacturing or producing strips of mutually integrated nails as hereinbefore defined, with the aid of mechanical means, it is endeavoured to produce nail strips in which all individual nails, or nail forms, present in the strip have mutually identical cross-sectional shapes and are located at a constant, uniform distance from mutually adjacent nails, so that the nail pitch is constant along the whole length of the strip.
In practice, however, it is impossible to ensure absolute constant cross-sectional shape and constant nail pitch at reasonable costs, and consequently the cross-sectional shape of such nails, or nail forms, and the nail pitch, i.e. the distance between two mutually adjacent nails, will vary necessarily within certain given tolerances along the length of the strip, thereby requiring subsequent adjustments to be made to nail positions during a nail firing or driving sequence. Manufacturing tolerances permitted in the driving track and barrel bore incorporated in the nail driving section, or breech, of the apparatus also make it necessary to finely adjust the position of a nail positioned in the nail driving location, or breech position, prior to "triggering" the apparatus.
Consequently, the primary object of the invention is to provide in such apparatus an arrangement which will ensure that a nail strip is advanced through a distance equal to the nail pitch, i.e. the distance between two mutually adjacent nails, and also ens
REFERENCES:
patent: 2982595 (1961-05-01), Rogers, Jr.
patent: 3259292 (1966-07-01), Maynard
patent: 3330462 (1967-07-01), Colechia et al.
patent: 4380312 (1983-04-01), Landrus
patent: 4470531 (1984-09-01), Anstett
Bell Paul A.
Nordisk Kartro AB
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