Self-elevating scaffold construction

Claim 2

A scaffold construction including a pair of end frames each having upper and lower sections guidingly supported from each other for relative vertical shifting, motor means connected between said upper and lower sections for shifting the latter relative to each other, scaffold board support means carried by said upper sections for supporting the opposite ends of boards extending therebetween, said upper and lower sections including anchor structure for releasable engagement with and support from upper and lower portions of adjacent conventional scaffold end sections, the anchor structure of said lower sections also being provided for releasable engagement with and support from upper portions of adjacent conventional scaffold end sections.

Claim 3

The combination of claim 1 wherein said motor means includes an upright fluid cylinder having its Upper and lower ends connected to said upper and lower sections, respectively.

Claim 4

The combination of claim 2 wherein said fluid cylinder is of the double acting type.

Claim 5

A scaffold construction including a pair of end frames each having upper and lower sections guidingly supported from each other for relative vertical shifting, motor means connected between said upper and lower sections for shifting the latter relative to each other, scaffold board support means carried by said upper sections for supporting the opposite ends of boards extending therebetween, each of said lower sections including a lower horizontal member and a pair of first uprights supported at their lower ends from spaced portions of said horizontal member and interconnected at their upper ends by means of a cross member extending therebetween, each of said upper sections including a pair of spaced and interconnected second upstanding tubular uprights telescoped over said first uprights, said scaffold board support means comprising portions of vertically spaced brace means extending between and secured to said tubular uprights.

Claim 6

A scaffold construction including a pair of end frames each having upper and lower sections guidingly supported from each other for relative vertical shifting, motor means connected between said upper and lower sections for shifting the latter relative to each other, scaffold board support means carried by said upper sections for supporting the opposite ends of boards extending therebetween, each of said lower sections including a lower horizontal member and a pair of first uprights supported at their lower ends from spaced portions of said horizontal member and interconnected at their upper ends by means of a cross member extending therebetween, each of said upper sections including a pair of spaced and interconnected second upstanding tubular uprights telescoped over said first uprights, said scaffold board support means comprising portions of vertically spaced brace means extending between and secured to said tubular uprights.

Claim 7

The combination of claim 3 wherein said motor means including an upright fluid cylinder having its upper and lower ends connected to said upper and lower sections, respectively.

Claim 8

The combination of claim 5 wherein said fluid cylinder is of the double acting type.

Claim 9

The combination of claim 4 wherein said first pair of uprights including longitudinally extending rack teeth and said second pair of uprights including pivoted stop dogs engageable with said teeth in ratchet fashion for preventing uncontrolled dropping of said second uprights relative to said first uprights in the event of failure of said motor means.

Claim 10

The combination of claim 7 wherein said upper and lower sections include anchor structure for releasable engagement with and support from upper and lower portions of adjacent conventional scaffold end sections, the anchor structure of said lower sections also being provided for releasable engagement with and support from upper portions of adjacent conventional scaffold end sections.

Claim 11

The combination of claim 8 wherein said motor means includes an upright fluid cylinder having its upper and lower ends connected to said upper and lower sections, respectively.

Claim 12

The combination of claim 9 wherein said fluid cylinder is of the double acting type.

Claim 13

A scaffold construction including a pair of end frames each having upper and lower sections guidingly supported from each other for relative vertical shifting, motor means connected between said upper and lower sections for shifting the latter relative to each other, scaffold board support means carried by said upper sections for supporting the opposite ends of boards extending therebetween, each of said lower sections including a lower elongated horizontal member and a pair of first uprights supported at their lower end portions from longitudinally spaced portions of said horizontal member spaced inwardly of the opposite ends of said horizontal member, each of said upper sections including a pair of spaced uprights guidingly engaged with said first uprights and interconnected at their lower end portions by means of a second lower elongated horizontal member to which the lower end portions of said second uprights are secured at portions spaced therealong and inwardly from the opposite ends of said second horizontal member, the opposite end portions of the horizontal member of said upper section, outwardly of the corresponding uprights, including anchor structure for releasable engagement with and support from the upper portions of adjacent conventional scaffold end sections, the opposite end portions of the horizontal member of the lower section, outwardly of the corresponding uprights, including anchor structure for releasable engagement with and support from the upper and lower portions of adjacent conventional scaffold end sections.

Claim 14

A scaffold construction including a pair of end frames each having upper and lower sections guidingly supported from each other for relative vertical shifting, motor means connected between said upper and lower sections for shifting the latter relative to each other, scaffold board support means carried by said upper sections for supporting the opposite ends of boards extending therebetween, each of said lower sections including a lower elongated horizontal member and a pair of first uprights supported at their lower end portions from longitudinally spaced portions of said horizontal member spaced inwardly of the opposite ends of said horizontal member, each of said upper sections including a pair of spaced uprights guidingly engaged with said first uprights and interconnected at their lower end portions by means of a second lower elongated horizontal member to which the lower end portions of said second uprights are secured at portions spaced therealong and inwardly from the opposite ends of said second horizontal member, the opposite end portions of the horizontal member of said upper section, outwardly of the corresponding uprights, including anchor structure for releasable engagement with and support from the upper portions of adjacent conventional scaffold end sections, the opposite end portions of the horizontal member of the lower section, outwardly of the corresponding uprights, including anchor structure for releasable engagement with and support from the upper and lower portions of adjacent conventional scaffold end sections.

Claim 15

The combination of claim 11 wherein sAid motor means includes an upright fluid cylinder having its upper and lower ends connected to said upper and lower sections, respectively, said fluid cylinder being of the double-acting type.