Extendable/retractable support column
An extendable and retractable column which is formed from at least three linked sections. The linked sections include a plurality of individual sections linked end to end. As the linked sections are extended, each of the individual sections engage adjacent individual sections to form a column. As the linked sections are retracted, each of the individual sections disengage from the adjacent individual sections and the column may be retracted for compact storage.
1. An extendable/retractable column comprising:
a plurality of linked sections each including a plurality of individual sections, each of the individual sections including a first and second end and a pair of opposing sides, the individual sections pivotally connected to one another in end-to-end relationship;
each pivotally connected individual section having a first pivot axis adjacent the first end and a second pivot axis adjacent the second end to allow the first end of an individual section to pivot relative to the second end of an adjacent individual section, all the pivot axes of the individual sections of a linked section being substantially parallel;
each linked section having the pivot axes of its individual sections oriented substantially nonparallel to the pivot axes of the remaining linked sections of the plurality of linked sections;
each linked section being spaced from the remaining linked sections when the column is retracted;
a retaining ring positioned adjacent the linked sections to permit the linked sections to be received within and to pass through the retaining ring, the retaining ring further including:
a plurality of roller support members;
a plurality of rollers;
each roller support member including a pair of flanges constructed and arranged to rotatably mount at least one roller;
a pair of brace members attached to and extending between each roller support member and interconnecting the roller support members to rigidly form the retaining ring;
a plurality of roller support flanges, a roller support flange positioned adjacent each flange of the roller support members and cooperating with the roller support member flanges to rotatably mount the said at least one roller therebetween; and
the rotatably mounted rollers positioned to confront and bear against a linked section to allow the linked section to be guided along and through the retaining ring while supported against the rollers.
2. The extendable/retractable column of claim 1 wherein the plurality of rollers supported between each roller support flange and cooperating roller support member is three, and the three rollers are arranged in vertical alignment for rotation about mutually parallel axes.
3. The extendable/retractable column of claim 1 wherein;
the two brace members comprising each pair of brace members are parallel and spaced apart;
each roller support member has an upper and lower end; and
each said pair of brace members is arranged with one brace member interconnecting the upper ends of adjacent roller support members and the remaining brace member interconnecting the lower ends of the adjacent roller support members.
4. The extendable/retractable column of claim 1 wherein each roller support flange includes an elongated angle iron with an “L” shaped cross section, one side of the L cross section being clamped between a roller support member and a brace member.
5. The extendable/retractable column of claim 1 wherein each roller support member, when placed in a substantially vertical position, includes a first horizontal flange at its upper end and a second horizontal flange at its lower end and each said horizontal flange includes an aperture, the said apertures centered on a common axis.
6. The extendable/retractable column of claim 5 wherein the aperture in said upper flange includes a threaded insert.
7. The extendable/retractable column of claim 6 wherein a support rod extends from the lower aperture through the upper aperture and is threaded into the threaded aperture of the upper flange.