US2170708A - Eyelet - Google Patents

Description

Aug. 22, 1939. l .l v '.J. coRDElRo 2,170,708

EYBLET Filed April 29, 193'? Patented Aug. 22, 1939 UNITED STATES PATENT OFFICE 2,170,708 EYELET Application April 29, 1937, Serial No. 139,703

3- Claims.

This invention relates to eyelets so formed as to facilitate their presentation to and their setting in work, and While not limited thereto, they are of special utility in connection with blind 5 eyelet setting.

When setting eyelets blind it is found desirable to form the entering end of the eyelet barrel of substantial thickness so that it may act, when the eyelet is inserted in the Work, to push the outer layer of the work beneath which it is desired to clinch the eyelet barrel, past a setting shoulder of the setting tool, and to avoid catching of the entering end of the eyelet barrel into the back of this outerlayer.

Various methods have been employed to produce this relatively thick end. Sometimes the eyelet has been formed as a cup, the bottom of which is drilled or cut out to less than the full internal diameter of the eyelet. Another method has been to tumble the sharp end eyelets in a tumbling barrel until the sharp end has been turned inwardly to a suicient extent. Still another method has been to turn in the sharp end by the use of special blunting dies. In all cases, however, it appears that this thickening or blunting has resulted in the entering end of the eyelet being of smaller internal diameter than that of the barrel inwardly from this end. This requires that the spindle or pilot which is common- 1y employed to center the eyelet and to present it between the setting dies and which commonly projects initially entirely through the barrel of the eyelet, be of a diameter less than the internal diameter of the main portion of the eyelet barrel, so that it cannot firmly support the eyelet against tilting when the latter is presented between the setting surfaces. When such tilting occurs it may result in improper setting of the eyelet. A

further undesirable result of this formation of the eyelets is that when the end of the eyelet is split and turned outwardly and downwardly as the eyelet is being set, this in-turned portion is turned upwardly and outwardly and presents rough sharp edges which are liable to catch in the upper layer of the work beneath which the eyelet is clinched when set blind. When the eyelet is set through and through the initially inturned edges are exposed on the back face of the work and present undesirable rough sharp edges. Y

In accordance with the'present invention a thickened entering end of the barrel is provided without a decrease in the internal diameter of 55 the eyelet barrel and without the formation of a rough and sharp back face of the thickened portion in the eyeletted work.

The method shown herein for producing this desirable eyelet construction consists in forming the thickened end of the barrel by turning its 5 margin outwardly and then preferably backwardly against the remainder of the barrel. This results in the entering end of the barrel being formed of a folded and therefore smooth edge, and the thin edge of the metal being folded back 10 against the back face of the goods during the setting operation causes a smooth face of the metal to be presented on the exposed back face of the work when the eyelet is set through and through or against the back face of the outer 15 layer of the work when the eyelet is set blind. The bore of the eyelet is of undiminished size at its outer end so that it can closely embrace the setting pilot or spindle for a substantial length, by which it may be held rmly against tilting or 20 rocking and accurately presented to the work for setting. Furthermore, the edge of the metal where it is folded in when the eyelet is set provides a gripping engagement with the adjacent face of the work spaced somewhat from the hole 25 through the work through which the eyelet passes -zand thus reinforces the hole against distortion by llateral pressure exerted on the eyelet.

For a more complete understanding of this invention, reference may be had to the accom- 30 panying drawing in which v Y Figure l is a side elevation of an eyelet before being treated in accordance with this invention.

Figure 2 is a side elevation of the completed eyelet.

Figures 3 to 6 are fragmentary views partly in elevation and partly in section of devices for forming over the entering end of the eyelet barrel, and showing the eyelet in successive stages of the forming operation.

Figure '7 is a diagrammatic view partly in section showing an eyelet of the form shown in Figure 2 on the pilot of the setting mechanism and about to be set blind.

Figure 8 is a detail section showing the eyelet 45 set blind.

Referring to the drawing, in Figure l is shown an eyelet having the usual flange l and barrel 2 with its end 3 partly scored as at 4 to provide weakened portions at intervals about its circumference at which the eyelet barrel may split and be turned as will subsequently appear. The barrel of this eyelet at its free end is not thicker than inwardly from this end. This eyelet may be placed in position over a pilot 5, as shown in Figures 3 to 6. The pilot 5 is shown as slidably mounted in a sleeve 6, being normally pressed to extend therefrom as by means of a spring 'l seated in a socket 8 in the sleeve and reacting between a head 9 at the inner end of the pilot and a threaded plug lll secured in the outer end of the sleeve. The head 9 is normally pressed by the spring 'I into contact with an internal shoulder I l on the sleeve. The inner end of this sleeve has an annular face I2 for engaging the flange l of the eyelet placed on the pilot 5.

Mounted in alinement with the pilot 5 is an ejecting plunger l5. This plunger is mounted for axial movement within a die I 6, being of somewhat smaller external diameter than the bore of this die. At its outer end facing the pilot 5 it is provided with a tapered reduced diameter portion ll against which the free end portion 3 of the eyelet barrel may be pressed by motion exerted axially on the sleeve 6, as shown in Figure 4. This pressing of the eyelet turns outwardly the scored extremity 3 of the eyelet barrel so that it may engage an end forming face i8 en the die i6 so that as the sleeve 6 continues its motion toward the die, the free end of the `eyelet barrel is split and turned outwardly as shown at J in Figures 5 and 6. Continued motion of the sleeve 6 coupled with a retraction of the plunger l5 into the die I5 results in the eyelet barrel being driven in the bore of the die I6 and the outwardly turned portion 2l] folded back against the outer face of the eyelet barrel as shown in Figure 5. This completes the forming action on the eyelet, which is then ejected by motion of the plunger l5 to the right, as viewed by Figures 5 and 6, and the retraction vof the sleeve S and the plunger 5. This results in the eyelet having the entering end of its barrel thickened by being folded back on itself, presenting a folded edge to enter into the work in which the eye-let is to be set.

Any suitable means may be provided for producing the relative motions of the forming devices, such being indicated diagrammatically by the arrows associated with Figures 3, 5 and 6.

In Figures 7 and V8 different stages of a blind setting operation are shown in which the setting tools are illustrated at 25 and 26. The setting too-l 26 is also formed as a punch having a pilot portion El. The eyelet is picked off by the pilot 2l in the well understood manner from a raceway or other suitable presenting means, and is then positioned in alinement with the tool 2S. It will be noted that this pilot may engage the inner face of the bore throughout substantially its entire length, there being no obstructions of this bore such as are formed where the end of the eyelet barrel is in-turned to present a thickened edge to the work. The thickened edge 28 of the eyelet acts, as the setting tools are brought together, to force the upper layer 2&3 of the work beyond the setting shoulder 3!) of the tool 25 so that the eyelet does not extend therethrough, but instead is forced through the lower and intermediate layers of work 3| and 32, respectively, and turned outwardly against the setting shoulder beneath the outer layer of work 29, as shown in Figure 8. The entering end of the eyelet is thus formed in a double outwardly extending flange, the terminal layer of which lies on its inner face. It will be noted that a smooth folded edge of the eyelet is presented to the work during the setting operation, while the inner edge of the eyelet barrel, as at 33, forms an annular ridge engaging in the layer of Work 32 which is squeezed in between it and the eyelet barrel by the setting operation somewhat outwardly of the hole in the work through which the eyelet was inserted. This acts to afford a reinforcing grip between the eyelet and the work somewhat outwardly of the bore through the work through which the eyelet extends. The outer face of the eyelet barrel which comes beneath the layer of work 29 when the eyelet is set blind, or which would be exposed on the back face of' the work where the eyelet is set through and through presents a smooth surface, free from all projections or sharp edges which might tend to catch in adjacent surfaces. Thus not only is an improved appearance imparted to the work, but, when the eyelet is set blind, it is prevented from catching or injuring the outer layer 29.

From the foregoing description of the new eyelet and means by which is may be formed, and the resultant structure when the eyelet is set in the work, it should be evident to those skilled in the art that various changes and modications may be made without departing from the spirit or scope of this invention as dened by the appended claims.

I claim:

1. An applied eyelet structure which consists of a single thickness barrel extending through sheet material to which the eyelet is applied,

and terminating at one end in an outwardly directed continuous ange engaging one face of said material and at the other end in an outwardly directed double iiange formed of two parallel integral layers connected by a fold around their outer margins, the terminal layer lying on the inner face of said double flange.

2. An applied eyelet structure which consists of a sing-le thickness barrel extending through sheet material to which the eyelet is applied, and terminating' at one end in an loutwardly directed continuous flange engaging one face of Vsaid material and at the other end in an outwardly directed double ange formed of two parallel integral layers connected by a fold around their outer margins, the terminal layer lying on the inner face of said double flange terminating spaced from said barrel and presenting an edge for engagement with the work projecting between it and said barrel.

3. An applied eyelet structure which consists of a single thickness barrel extending through sheet material to which the eyelet is applied, and terminating at one `end in an outwardly directed continuous flange engaging one face of said material and at the other end in 'an outwardly directed double ange formed of two parallel integral layers connected by a fold around their outer margins, the terminal layer lying on the inner face of said double flange terminating spaced from said barrel and presenting an edge for engagement with the work projecting between it and said barrel, and the outer of said layers presenting a smooth outer face.

JOSEPH CORDEIRO.

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