US1654837A - Method of manufacturing barbed wire - Google Patents

Description

I heavy spools could not be effected,

Patented Jan. 3, 1928.

.o'r ro SCHMID, or RnUT INGnN, GERMANY.

ivrn 'r non OF MANUFACTURING BABIBED WIRE.

Application filed. may 12, 1924; Serial a... 712,817, and

The present inventionrelates to a method of manufacturing barbed wire of the kind in whlch the barbs are formed by the ends of a section ofwire that is twisted along with the through tension wire. Up to the present the two wires have been twisted in the same direction throughout, a method which complicates the manufacture by machinery ina much as during theftwisting operation, the entire feed spool of wire has to be rotated with the wirewinch. The advantage of twisting the-jwires-in oppositedireetions is that two twisted portions are continuously and simultaneously produced and thus also two pairs of barbs. That is, double the output is obtained in a unit of time, since only one pair of barbs is produced when the twisting is always in the same direction. Thus the efficiency is doubled.

A further advantage is that the wire to be worked can be taken directly from the feed spool, as this can remain stationary. If, for example, the wire be always twisted in the same direction, the barbed wire, after each twisting, must always be turned back, as otherwisethe feed wires become more and more entangled; or else the entire feed spool has to be turned at each twisting,which, in view of its great weight and the short and numerous operative periods, cannot be practically accomplished. For such an operation, the machine would have to be made very heavy and would soon need repair and attention. Moreover, such operation is quite impractical, as the heavy spools of wire could, scarcely be set in motion before the operation of twisting would be terminated, and the heavy wire spools then stopped and held before they could again be set in motion. The necessary rapid movements of the due to the spools large inertia.

The old method is thus impractical and industrially inoperative. On winding or twisting in the same direction the wire would have to be wound off and On the spool, and 'then on twisting, the spools would have to be rotated about the axis of the barb wire. This winding on the spool, which is obviated by the present invention is costly in both time and money, labor and apparatus This is eliminated by the present eration is carried on directly from the spool which remains stationary. About 200 meters at most are wound on a spool, and the operainvention, as opin Germany November 1, 1923.

tion is very rapid, asthe 200 metersareused up in a short-time, and larger spools cannot be used on account of too great weight.

The barbed wire of the present inventionhas barbs which are twisted to the'right and left alternately. According to the invention this enables two successive (sectional lengths) of'wire to be twisted simultaneously and in such a way that the wire winch remains at rest. I The manner of carrying out the method consists in feeding the wire adistance'equal to two twist sections at a time. Theusual clamping tools are situated to the right and left of the two sectional lengths'of wire'that are to be twisted, whilst the twist- Eng tool acts in an intermediate position. In-

stead of making two twists at a time, each twistcan be produced separately in which event the twisting tool is rotated in one direction to make the first twist and back again in making the second twist. Y -Animprovement in the method of manufacturing this barbed wire consists in that the one wire-for example, the wire out of which the barbs are afterwards formed, is thinner than the other. The employment of wires of different thickness has the advantage that the thinner wire entwines in an exceedingly firm manner with the thicker one in the twisting process. The wire is also more effectually protected by the longer wire.

In this case, the manufacture is attended with the difiiculty that the thinner wire has a tendency in twisting to merely lap itself round the thicker wire instead of the two intertwining uniformly. In order to obtain such uniformity the two wires must be.

gripped so firmly in advance and in rear of the section to be twisted that they cannot shift in the clamps but remain in their relative position therein.

Barbed wire according to the method of the present invention is illustrated 'in the drawing in two typical .embodiments. i

Fig. '1 shows two wires of equal thickness in untwistedcondition; c

Fig. 2 shows the wires after twisting; Fig. 3 shows a finished section of barbed wire; 7

.Figs. 4, 5 and 6 are views similarrespeo' tively to Figs. 1, 2 and 3, but with wires of unequal thickness I The two wires to be treated, a and I) lie closely positioned side by side and in the embodiment shown are firmly held in their relative position on bothsides of the sections c to be twisted by clamping devices 6. The two wires a and h are then gripped in the center of the section 0 by a twisting tool d and twisted, thus formingthe twist sections 6 the spirals of which run in opposite directions. The one wire 6 is next cut through and its ends 7 are bent outward so as to form the barbs: whereupon thewires a and b are moved a working sectional length onward and the process repeated.

I claim z- 1. The method of manufacturing single strand barbed wire from' a plurality of strands comprising twisting said strands to gether alternately in oppositedirections at the points of securement of the barbs. and

cutting all the strands but one between said points of securemeut, forming barbs.

2. In the method of manufacturing single strand barbed wire as claimed in claim 1. using for the wire forming the barbs a strand of different thickness from that of the sustaining strand. I

3. In a method of manufacturing barbed wire, firmly holding the main wire and the wire to form the barbs in their relative positions at points in front and to'the rear of the sections to be twisted and'the'n twisting the wires at a point'midway of the holding points. I

4. In a method of'manutacturing barbed wire, firmly holding the main wire and the wire to form the barbs in their relative positions at points in front and to the rearof the sections to be twisted and then twisting the wires at a point midway of the holding points, and using for the wire forming the barbs, a wire of diff rent thickness from that of the other wire. a p

5. In a method-of manufacturing single: strand barbed wire, twisting the wire forming each successive pair of barbs in opposite directions and firmly gripping the main wire and-the wire forming the barbs,.at one point, and then intertwisting the wires at a point removed from said'one point. ,7

In testimony whereof I aflix my signature.

O'llTO- SCHMID.

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