Patent ID: 7290756
Filing Date: 2007-11-06
Classification: E01F,E04H,F41H

Abstract:
1. A plural coil tape product comprising: a first concertina coil extending from a first end to a second end of the coil along a first coil axis; at least a second concertina coil extending generally from a first end to a second end of the coil along a second coil axis; and the second concertina coil intersecting the first concertina coil at a plurality of intersections along the length of the intersected coils, each intersection being in at least partially overlapping and interdigitated side by side relation along the first and second coil axes; wherein each intersection comprises connection of the second concertina coil at more than one circumferentially spaced connection point on the first coil to form petal shaped regions to stiffen the configuration of the at least two coils.