US 3155374 A
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Nov. 3, 1964 'G. SIE FFE RT $155374 PLAIN 0R BABBED WIRE DEFENSE COIL Filed June 16. 1961 3 Sheets-Sheet 1 NOW /N VENTOR GEORGES SIEFFERT ATTORNEYS Nov. 3, 1964 s. SIEFFERT 3,155,374
PLAIN OR BARBED WIRE DEFENSE con.
Filed June 16. 1961 3 Sheets-Sheet 2 I IN VENTOR: Gaonees SIEFFERT BY: mqewm'r ATTORNE V6 IN VENTOR GEORGES SI F R m @6144 dud rm ATTORN 5 Y5 United States Patent 3,155,374 PLAIN QR BARBED WIRE DEFENSE (IUIL Georges Sieifert, Impasse du Moulin, Bar-le-Dnc, Mensa, France Filed June 16, I961, Ser. No. 117,642. Claims priority, application France, lune 17, 1960, 830,477, Patent 1,2679% 8 (ll-aims. (Cl. 256-4) This invention relates to defense coils or rolls of plainor barbed wire, adapted to be uncoiled or spread and set as an obstacle.
As described in the French Patent No. 1,100,507, wire defense coils have already been proposed which consist of a wire Wound continuously according to a helical pattern and comprise between adjacent groups of a plurality of turns of same diameter one or more intermediate turns having a smaller radius of curvature. A coil of this type has been developed with a view to prevent any longitudinal progression within the coil itself.
However, a coil of the type broadly set forth hereinabove is attended by many drawbacks. Firstly, the inner and outer defense networks are made from the same wire. Besides, the wire pattern is not regular, so that inequalities in the network distribution are observed when the coil is spread or expanded, these inequalities constituting in many cases apertures facilitating the passage through the defense coil. Finally, it is hardly possible to modify the form of embodiment of the inner defense network.
It is the object of this invention to provide a defense coil whereby the drawbacks broadly set forth hereinabove are eliminated.
To this end, the plain or barbed wire defense coil of this invention is characterized in that it comprises two coaxial networks formed separately and constituting an outer network and an inner network respectively, the inner network having a smaller diameter than the outer network, the two networks consisting each of one or a plurality of wires wound as a helix, the number of turns of the inner network per unit length being smaller than the corresponding number of turns of the outer network, and that means are provided for hooking or otherwise securing the inner network to different points of the periphery of the outer network.
When spreading or setting the coil, the inner defense network is elongated and its diameter decreases, thus preventing any progression of an individual in the longitudinal direction within the network.
It is another advantageous feature of the defense coil of this invention that the mesh size of the inner network may be set at will, that is, by increasing or reducing the pitch of its turns, according to requirements. Furthermore, by using a suitable type of staples for assembling the different turns of the inner network with each other the inner network may be caused to act either as a traction spring or as a compression spring. If the inner network constitutes a compression spring, it will thus compensate the tractive effort which must necessarily be exerted on the outer network during the spreading operation, so that means weaker than usual may be used for anchoring the coil on the ground. It is even possible to use the coil on grounds that will not hold conventional anchoring means for example on sand, etc.
On the otherhand, with the method of constructing defense coils according to this invention it is possible to meet the requirements concerning the prescribed weight of each defense element, as long as the wire constituting the inner defense network is not compulsorily of the same gauge as the wire constituting the outer defense network; besides, with this method it is possible to determine at will the passage defense, the tractive effort or 3,l55,374 Patented Nov. 3, 1964 pressure, and finally the number of wires to be cut by an individual attempting to pass through the roll in the transverse direction.
Various forms of embodiment of the invention will now be described by way of example with reference to the accompanying drawings given by way of illustration, it being understood that many modifications may be brought thereto without departing from the spirit and scope of the invention as set forth in the appended claims. In the drawing:
FIGURE 1 is a diagram illustrating the principle of a defense coil constructed according to the teachings of this invention, the coil being shown in .its operative-or spread condition;
FIGURE 2 is an end view of the defense coil of FIG. 1;
FIGURE 3 is a diagram illustrating a modified embodiment of the defense coil also shown in its spread condition;
FIGURE 4 is an end view of the coil shown in FIG. 3;
FIGURE 5 is a developed view showing one portion of the defense .coil;
FIGURE 6 is an elevational view showing the outer network of a defense coil without the inner network;
FIGURE 7 is another elevational view showing the complete defensecoil of FIG. 6, that is, incorporating-the inner network;
FIGURE 8 is an end view of the coil shown'in FIG. 7;
FIGURE 9 is an elevational view-showing the mandrel or drum used for winding the inner network of the defense coil;
FIGURE 10 is a cross-sectional view taken upon the line X-X of FIG. 9;
FIGURE 11 is a longitudinal section of the winding drum or mandrel, after winding theouter network thereon and before stapling the turns thereof with one another and with those of the inner network;
FIGURE 12 is anend view taken from the left hand side of FIG. 11, showing the winding mandrel;
FIGURE 13 is a diagrammatic front view showing the inner network;
FIGURE 14 is an end view of the same network;
FIGURE 15 is a diagrammatic view showing the stapling of the inner network to the outer network.
In FIG. 1, the defense coil illustrated diagrammatically in-its spread or operative condition comprises an outer network 1 and an inner network 2 coaxial to the outer network. The inner and outer networks are illustrated in the form of a pair of helical coils; actually, as will be explained hereafter, the successive turns of each helix are hooked or stapled with one another .at certain points in order to impart a proper relative rigidity to the assembly.
The inner network 2 comprises a number of turns per unit length which is smaller than that of the outer network 1. As a result, when the coil is spread or set the inner defense network 2 forms a cylindrical body having a diameter D considerably smaller than, the diameter D of the outer defense network '1.
The inner network 2 is hooked at spaced intervals to the outer network 1 for example by meansof assembly wires such as 3 stapled or hooked at points 4 and 5 on the outer network 1 and inner network 2, respectively. The stapling points 4, 5 may be distributed at .will along the networks 1, 2. FIG. 2 shows these hooking points as located at the vertices of a regular pentagon, but it will be readily understood that any other arrangement may be used without departing from the spirit and scope of the invention. 7
In FIG. 3 the hooking or stapling wires 3" are dispensed with and replaced by a suitable alteration of the shape of some of the turns of the inner network 2. In fact, as shown more in detail in FIG. 4, at spaced longitudinal intervals one turn of the helix constituting the inner network 2 is elongated to form a curved outer portion 2a substantially tangent, at several points 6, 7, 8, 9, 10, to the cylinder on which the helix of the outer network 1 is formed. The turn sections 20: are stapled or hooked at these points, 6, 7, S, 9, It on the outer network 1 to provide the proper connection between the two net works.
Now a typical embodiment of the defense coil of this invention will be described with reference to FIGS. 5-8. FIGS. 6, 7 show the front half of the coil in thick lines and the rear half in broken lines in order to facilitate the understanding of the structure.
In FIG. 6 the outer network 1 consists of a wire wound as a helix wherein the successive turns are stapled together at points 11, 12, 13, 14, constituting the vertices of a regular pentagon. Of course, the number and distribution of these stapling points may differ from the example shown in this figure.
The inner network 2 is obtained according to the pattern illustrated in FIG. 8. The successive turns of the inner network are assembled with one another at points 16, 17, 18, 19 and 20.
In FIG. 7 it will be seen that when the defense coil is spread to its operative position the inner network 2 is elongated considerably more than the outer network 1, so that its diameter decreases and the inner network constitutes an eflicient protection against any longitudinal progression within the coil.
In FIGS. 9 to 12 of the drawing there is shown diagrammatically an apparatus for forming a defense coil according to this invention. This apparatus comprises a transverse flange 21 overhung from a shaft 22 adapted to be rotatably driven through any suitable means. The flange 21 carries five longitudinal rods 23, 24, 25, 26, 27 supporting at their outer ends a transverse support consisting for example of a pentagonal member 28.
In order to form the inner network of the defense coil, this apparatus is further provided with another assembly of five longitudinal rods 30, 31, 32, 33 and 34 carrying at spaced intervals guide plates 35 extending radially therefrom. The rods -34 are each carried by the ends of two arms 36pivoted by means of pins 37 on the one hand on the aforesaid support 28 and on the other hand on the fiange 21. The arms 36 are locked in position by pins 38.
On this winding mandrel the inner network is formed by winding as a helix a suitable wire engaging on the one hand the rods 23-27 and on the other hand the rods 3ti34. At regular intervals this wire is caused to pass over one of the guide plates so as to provide turn sections 2a elongated in the outward direction.
Upon completion of the winding of the inner network 2, the successive turns are stapled with one another by means of staples or clips disposed at points 16, 17, 18, 19 and 21 as shown in FIG. 8.
When the stapling of the inner network is completed the apparatus is prepared for winding the outer network 1. To this end an assembly of outer rods 40, 41, 42, 43 and 44 carried on the one hand by recesses formed in the flange 21 and on the other hand by connecting plates 45 secured on the vertices of the pentagonal support 28 are mounted on the apparatus. Thus, the rods 40, 41, 42, 43, 44 are disposed on the same radii as the inner rods 23, 24, 25, 26, 27, respectively.
Having thus mounted the outer rods 40-44, the operator winds the outer network 1. The wire constituting this network passes over the outer rods 40, 41, 42, 43, 44 and also periodically over the guide plates 35 having already received the turn sections 2a of the inner network 2.
Then, the successive turns of the outer network 1 are stapled with one another and the defense coil'is completed by stapling the turn sections 2a. to the outer network 1, preferably at or in close vicinity of the guide plates 35.
Upon completion of the stapling operation, the pin 38 are removed and the different arms 36 are rotated about their pivot pins 37 in order to retract the guide plates 35 inwardly. Then the connecting plates 45 and outer rods 40-44 are removed, and the coil assembly can be removed from the winding mandrel.
In the form of embodiment illustrated in FIGS. 13 to 15, the inner network consists of circular turns 21 having a diameter D and every third turn begins from successive points a, b, c of turns 22 closed by stapling at these points. Thus, these turns are free; their shape is altered substantially according to an ellipse having its minor axis=D and its major axis=D the latter being on the other hand the diameter of the outer network. To facilitate the understanding, the starting point a, b, c of the free turns are shown in FIGS. 13 and 15 as being aligned in a common diametral plane of the network; actually, in order to ensure a better symmetry of this network the points a, b, c are preferably shifted angularly from one another along a helix, as shown in FIG. 14, wherein the angle of shift is of the circumference from one point to another.
At the end of their major axis where they are tangent to the turns 23 of the outer network having a diameter D the free turns 22 of the inner network are stapled at 24 on said turns 23 of the outer network.
This network may be formed without difiiculty on the machine described and illustrated herein, at the cost of minor alterations as will be readily understood by anybody conversant with the art.
Without further analysis, the foregoing will so fully reveal the gist of the present invention that others can by applying current knowledge readily adapt it for various applications without omitting features that, from the standpoint of prior art, fairly constitute essential characteristics of the generic or specific aspects of this invention and, therefore, such adaptations should and are intended to be comprehended within the meaning and range of equivalence of the following claims.
What I claim is:
l. A wire defense coil, comprising an outer relatively small diameter wire wound in a coil of relatively large diameter and with relatively widely spaced convolutions, an inner wire of relatively small diameter wound in a coil of less diameter than the coil of said outer wire, said inner and outer wire convolutions being such that there is a free space of substantial dimension within said inner wire and between said inner wire and said outer wire, and means securing said inner wire to said outer wire at a plurality of locations spaced along the length of said wires.
2. A wire defense coil, according to claim 1, wherein said means securing said inner wire to said outer wire comprises a connecting wire.
3. A wire defense coil, according to claim 1, wherein said inner wire includes at least one turn extending outwardly into contact with said outer wire for connection thereto.
4. A wire defense coil, according to claim 1, wherein said inner wire is wound at a plurality of locations spaced along the length thereof with convolutions extending outwardly into contact with said outer wire.
5. A wire defense coil, according to claim 1, wherein said inner wire includes at least one convolution formed of a diameter substantially equal to the diameter of the winding of said outer wire and contacting said outer wire at at least two diametrically opposite points.
6. A wire defense coil, according to claim 1, wherein said inner wire includes at least one convolution which includes portions extending outwardly on opposite sides into contact with said outer wire and being connected thereto.
'7. A wire defense coil according to claim 1, wherein said means securing said inner wire to said outer wire at a plurality of locations spaced along the length of said wires 5 comprises separate connecting wires each formed in a flattened coil shape with an outer end of the coil connected to said outer wire and with an inner central portion connected to said inner wire.
8. Wire defense coil according to claim 1, wherein said means securing said inner wire to said outer wire at a plurality of locations spaced along the length of said wires comprises convolution of Wire, each Wire convolution being formed in a flattened coil shape with portions extending outwardly on opposite sides into contact With said outer wire and being connected thereto, the beginning of said convolution being connected to the end of the said convolution so as to flatten said coil shape convolution.
References Cited in the file of this patent UNITED STATES PATENTS Gleason et a1. Oct. 12, 1937 Endsley Aug. 22, 1944 See July 30, 1957 Ciccone et al. Oct. 20, 1959 Doerr Oct. 20, 1959