Patent ID: 6112474
Filing Date: 2000-09-05
Classification: E04H,H01Q,Y10T

Abstract:
A retractable column comprising:a set of at least three flexible webs, each of said webs having a set of teeth located along opposite edges of said webs, each of said teeth having a neck and a crown region with the crown region larger than the neck region, each ot said teeth having a first ear extending in a first direction and a second car extending in a second direction, at least two of said teeth on one of said flexible webs spaced from each other a distance substantially equal to a root distance ot a teeth on another of said flexible webs so the at least two of said teeth on one of said flexible webs can form neck to neck relationship with the teeth on another of said flexible webs with the necks located in snug but non interfering fit while the cars thereon are in overlapping engagement to thereby hold said webs proximate each other to so as to form a rigid column from said three flexible webs with a crown maximum dimension of adjacent teeth being progressively smaller and a base distance between adjacent teeth being progressively smaller.