Claims
- 1. The method of forming a strengthened strip of barbed tape and bending the strengthened tape into a helical coil; comprising:
- (a) providing a predetermined length of metal material in strip form having a predetermined width and a predetermined thickness permitting the material to be formed into a desired configuration;
- (b) providing a forming means in position to receive said strip of material;
- (c) feeding said strip of material to and through said forming means for forming an open strengthening groove longitudinally along the length of the strip in a predetermined location with respect to the width thereof;
- (d) feeding a flexible wire mandrel to and through said forming means conjointly with said strip of material, said wire mandrel and said forming means co-acting with said strip of material, as it passes through said forming means, to form said strengthening groove in said strip of material;
- (e) providing a radial bending means in position to receive both said strip of material and said wire mandrel as they exit said forming means;
- (f) feeding said strip of material and wire mandrel to and through said radial bending means wherein said bending means bends said strip about an edge of said strip;
- (g) said radial bending means co-acting with said strip of material and said wire mandrel to form said strip of material into a predetermined helical coil configuration;
- (h) separating said strip of material and wire mandrel; and
- (i) collecting said helical coil of strip material in a collecting means.
- 2. The method of claim 1 including providing said wire mandrel as a continuous loop of wire rope.
- 3. The method of claim 2 including providing guide means to guide said wire rope into a position of co-action with said strip of material.
- 4. The method of claim 3 including providing blanking means for said strip of material and feeding said strip of material to said blanking means prior to feeding same to said forming means.
- 5. The method of claim 4 wherein said blanking means forms barbs on said strip of material.
- 6. The method of claim 5 including providing said strip of material in roll form and providing means to support said roll and to feed same to said blanking means.
- 7. The method of claim 6 including providing two sets of two forming rolls in said forming means and providing drive means to both forming rolls of one of said sets and to only one forming roll of a second one of said sets.
- 8. The method of claim 7 including feeding said of material and wire mandrel to and through said forming means by pushing said strip of material and wire mandrel therethrough.
- 9. The method of claim 8 wherein said groove is substantially semi-circular in cross-section.
- 10. The method of claim 9 wherein said groove extends no more than 180 degrees of arc.
- 11. A method for forming a strengthened helical coil of barbed tape, said method comprising:
- providing a length of strip metal material of predetermined width and thickness;
- moving said material to a groove forming means;
- forming an open groove along a central portion of said strip material as it moves through said groove forming means wherein said groove is shaped to allow the unimpeded entry or removal of a mandrel member having an outer diameter substantially equal to an inner diameter of said groove;
- moving said grooved strip material to a bending means;
- locating a flexible wire mandrel member within said groove;
- bending said strip material about its edge in said bending means wherein said flexible mandrel member is located within said groove throughout the bending process and acts as a mandrel within said groove substantially maintaining the groove's shape throughout the bending process;
- once the grooved strip material has been bent, removing the mandrel member from the groove; and
- winding the formed barbed tape in a helical manner onto a collecting means.
- 12. The method of claim 11 further comprising forming barbs along at least one edge of said strip material prior to the material's entry into the groove forming means.
- 13. The method of claim 11 wherein said mandrel member moves with said strip material as said strip material passes from the forming means to the bending means.
- 14. The method of claim 13 wherein said wire flexible mandrel member is placed in contact with a flat face of said strip material prior to the strip material's entry into the groove forming means; and
- maintaining the contact between the mandrel member and the strip material during the groove forming wherein pressure is applied to said strip material to form said groove and wherein said groove partially encircles said mandrel member.
- 15. The method of claim 14 wherein said mandrel member travels in a circular path and once it is removed from the bent strip material, it continues along its path until it is again placed on a flat face of said strip material prior to the formation of the groove within said strip material.
Parent Case Info
This application is a continuation of application Ser. No. 06/814,782, filed Dec. 30, 1985, now abandoned.
US Referenced Citations (16)
Foreign Referenced Citations (4)
Number |
Date |
Country |
211726 |
Jul 1984 |
DDX |
55-10304 |
Jan 1980 |
JPX |
689772 |
Oct 1979 |
SUX |
1258518 |
Sep 1986 |
SUX |
Continuations (1)
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Number |
Date |
Country |
Parent |
814782 |
Dec 1985 |
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