Patent
1982-09-10
1984-12-25
Combs, E. Michael
B21G 308, B21G 318, B21G 324
Patent
active
044894562
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a tool for making so-called rivet nails or expansion nails, i.e. a nail that has at least at one end a laterally expandible portion. The nail is made by cutting off and stamping a nail wire.
Various tools have been designed for the manufacture of rivet nails but they have not proved able to attain the high speeds required for a rational production, i.e. at least about 200 nails per minute. This depends int. al. on the fact that the nails get stuck in the tool or are difficult to remove rapidly from the tool since that part of the tool which makes the expandible portion of the nail by stamping tends to retain the nail in the tool.
Complicated and expensive tools, including a plurality of mobile components, have been built in order to solve this problem. However, these tools have not been able to attain the high production rate necessary for an econimical manufacture of rivet or expansion nails.
The object of the present invention is to overcome the above-mentioned disadvantages and to produce a tool which can be run at a high production rate without functional disorder due to the fact that it will be very simple although it produces one completely finished expansion nail per working stroke. The manufacture also takes place without wastage of material, thus eliminating the problems of collecting and removing wastage as well as the costs entailed therewith. Thanks to the simplicity of the tool it will also become amazingly cheap.
This object is realised by the tool according to the invention which effects cutting off the point of the nail and stamping the expandible portion of the nail during a single working stroke because the tool comprises a guide for the nail wire for guiding the wire in a plane perpendicular to the wire, a cutting-off means having cutting edges disposed in V-fashion, a stamping means arranged in the symmetry plane of said V-shaped cutting edge arrangement on the "open" side of the edges facing away from the point, and resilient applicators for the wire adapted to be pressed by the nail wire during the working stroke of the tool in a direction opposite to the working direction of the tool against the action of a spring and to lift the nail wire from the cutting-off means and stamping means during the return stroke of the tool.
In a second embodiment of the invention the tool comprises two identical tool sections including each a nail wire guide, a cutting-off edge, a wire applicator and a stamping means which are arranged straight opposite each other on those surfaces or ends of the tool sections which face each other and are perpendicular to the direction of motion of the working stroke of the tool, said applicators being adapted during the working stroke to be brought to bear against each other around the nail wire and to be pressed downwards, against the action of a spring means, in the tool frame slidably supporting the applicator, and at the end of the working stroke the cutting-off edges and the stamping means are carried close to each other in order to effect cutting-off and stamping of the nail wire.
In a third embodiment of the invention the stamping means consists of a mandrel having a stamping edge situated in the symmetry plane and generally parallel to the nail wire, top surfaces or top facets inclined obliquely downwardly-outwardly from the edge on either side of the symmetry plane, and side facets adjoining the top facets and arranged further away from the symmetry plane, said side facets having a smaller angle of inclination than have the top facets relative to the symmetry plane and extending down to the end surface of the tool body.
In a fourth embodiment each top facet consists of a generally plane and triangular surface defined by lines between the end points of the stamping edge and a point situated on or immediately above the plane of the end surfaces and between the end points of the stamping edge, while in a fifth embodiment said point is situated on the end surface of the tool body half-way between the end points of the stamping ed
REFERENCES:
patent: 465960 (1891-12-01), Yoch
patent: 701178 (1902-05-01), Dussault
patent: 2329744 (1943-09-01), Clarke
patent: 3254550 (1966-06-01), McDonald
patent: 3728888 (1973-04-01), Motzer
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