Swivel standard for portable projection screen

Claim 2

In a portable projection screen having a squared crosssection standard, a base having tripod legs and spreader links, the improvement comprising a means on said base for swiveling the standard about a vertical axis without lifting the standard base off the floor, said swivel means coMprising: a. a top bracket means pivotally mounting the tripod legs and having an axial bore means for sliding along and swively mounting said standard; and b. a bottom bracket means pivotally mounting the spreader links and having a shouldered bore means for swively mounting and supporting said standard, said top bracket means comprises: c. a top spider having a cylindrical bore; d. a shouldered cylindrical bushing having a squared crosssection axial bore for the reception of the lower portion of the standard; and e. a retaining ring anchored on the top spider for retaining the shouldered cylindrical bushing in the top spider.

Claim 3

In the portable projection screen of claim 1 wherein the bottom bracket means comprises: a. a bottom spider having a shouldered cylindrical bore; b. a shouldered cylindrical bushing having a squared cross-section axial bore; c. a cap plate mounted on the lower side of the bottom spider for supporting the shouldered cylindrical bushing in the bottom spider; and d. means for fixing the shouldered cylindrical bushing to the standard. a cylindrical retaining means, links said bottom spider cylindrical

Claim 4

In a portable projection screen comprising a square tubular standard, a top bracket means slidable along said standard, a plurality of legs located for supporting said standard in an upright position and pivoted on said top bracket means, said top bracket means comprising a top spider having a cylindrical bore, a shouldered bushing having an axial square in cross section bore, a retaining ring mounted on the top spider for retaining the shouldered cylindrical bushing in said top spider, a bottom bracket means on the lower end of said standard spaced from said top bracket means, links connecting said legs to said bottom bracket means for swinging said legs toward and away from said standard through sliding movement of said top bracket means, said bottom bracket means comprising a bottom spider having a cylindrical bore, a shouldered cylindrical bushing having a square in cross section bore, a cap plate mounted on the bottom spider for retaining the shouldered cylindrical bushing in said bottom spider, and means for fixing the shouldered cylindrical bushing to the standard.

Claim 5

In a portable projection screen comprising a square tubular standard, a top bracket means slidable along said standard, a plurality of legs located for supporting said standard in an upright position and pivoted on said top bracket means, said top bracket means comprising a top spider having a cylindrical bore, a shouldered bushing having an axial square in cross section bore, a retaining ring mounted on the top spider for retaining the shouldered cylindrical bushing in said top spider, a bottom bracket means on the lower end of said standard spaced from said top bracket means, links connecting said legs to said bottom bracket means for swinging said legs toward and away from said standard through sliding movement of said top bracket means, said bottom bracket means comprising a bottom spider having a cylindrical bore, a shouldered cylindrical bushing having a square in cross section bore, a cap plate mounted on the bottom spider for retaining the shouldered cylindrical bushing in said bottom spider, and means for fixing the shouldered cylindrical bushing to the standard.