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US 4,951,780 AGranted

Combination ladder and height adjustable scaffold

OwnerMyung H. Kiminventor

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Abstract

A combination folding ladder and height adjustable scaffold, comprises (a) a first assembly including a first leg and a second leg, each formed by an outer and inner telescoping member, and outer and inner rungs which connect the outer and inner telescoping members in substantially parallel, spaced apart relation; (b) a second assembly including a third leg and a fourth leg, each formed by an outer and inner telescoping member, and outer and inner rungs which connect the outer and inner telescoping legs of the third and fourth legs in substantially parallel, spaced apart relation; (c) positioning joints removably secured to upper ends of the for pivotally securing the first and second assemblies together; (d) a height adjustment assembly for varying the heights of the legs; and (e) a scaffold platform for use with the combination when the positioning joints are removed from the legs and the first and second assemblies are separated, the scaffold platform including a flat rectangular board, U-shaped supports at the opposite short ends for defining channels for receiving any of the rungs at a first vertical level, and a plurality of hook arms pivotally secured to the underside of the board and having hook ends for receiving any of the rungs at a second vertical level, such that a stable scaffold is provided by the first assembly, the second assembly separated therefrom and the scaffold platform connecting together the first and second assemblies.

Claims23

Dependent claims

Claim 1A combination folding ladder and height adjustable scaffold · 197 words3 dependent Claim 5A combination folding ladder and height adjustable scaffold · 298 words2 dependent Claim 8A combination folding ladder and height adjustable scaffold · 296 words11 dependent Claim 20A combination folding ladder and height adjustable scaffold · 397 words2 dependent Claim 23A combination folding ladder and height adjustable scaffold · 517 wordsNo dependents

A combination folding ladder and height adjustable scaffold, comprising:

(a) a first assembly including:
(i) a first leg,
(ii) a second leg, and
(iii) a plurality of rungs connecting together said first and second legs in substantially parallel, spaced apart relation, each rung adapted to support one end of a scaffold platform;
(b) a second assembly including:
(i) a third leg,
(ii) a fourth leg,
(iii) means for connecting together said third and fourth legs in substantially parallel, spaced apart relation and for providing a scaffold support which supports an opposite end of the scaffold platform;
(c) joint means removably secured to upper ends of said first through fourth legs for pivotally securing said first and second assemblies together, said joint means including:
(i) an outer joint section formed by a central rotatable section and a leg section depending therefrom,
(ii) an inner joint section formed by a central rotatable section and a leg section depending therefrom,
(iii) means for rotatably securing together said central rotatable sections of said outer and inner joint sections;
and
(d) securing means for removably securing said leg sections of said joint means to upper ends of said first through fourth legs.

11 more elements

A combination folding ladder and height adjustable scaffold, comprising:

(a) a first assembly including:
(i) a first leg,
(ii) a second leg, and
(iii) a plurality of rungs connecting together said first and second legs in substantially parallel, spaced apart relation, each rung adapted to support one end of a scaffold platform;
(b) a second assembly including:
(i) a third leg,
(ii) a fourth leg,
(iii) means for connecting together said third and fourth legs in substantially parallel, spaced apart relation and for providing a scaffold support which supports an opposite end of the scaffold platform;
(c) upper ends of said first through fourth legs each include at least one through hole extending therethrough;
(d) joint means removably secured to upper ends of said first through fourth legs for pivotally securing said first and second assemblies together, said joint means including:
(i) an outer joint section formed by a central rotatable section and a lege section depending therefrom, said leg section including at least one bolt hole extending therethrough;
(ii) an inner joint section formed by a central rotatable section and a leg section depending therefrom, said leg section including at least one bolt hole extending therethrough;
and
(iii) means for rotatably securing together said central rotatable sections of said outer and inner joint sections;
and
(d) securing means for removably securing said joint means to upper ends of said first through fourth legs, said securing means including bolt means extending through said at least one bolt hole of said leg sections of said outer and inner joint sections and said at least one through hole in said upper end of each respective leg, and nut means threadedly engageable with said bolt means for removably securing said joint means to upper ends of said first through fourth legs.

13 more elements

A combination folding ladder and height adjustable scaffold, comprising:

(a) a first assembly including:
(i) a first leg,
(ii) a second leg, and
(iii) a plurality of rungs connecting together said first and second legs in substantially parallel, spaced apart relation;
(b) a second assembly including:
(i) a third leg,
(ii) a fourth leg,
(iii) means for connecting together said third and fourth legs in substantially parallel, spaced apart relation and for providing a scaffold support;
(c) joint means removably secured to upper ends of said first through fourth legs for pivotally securing said first and second assemblies together, said joint means including:
(i) an outer joint section formed by a central rotatable section and a leg section depending therefrom,
(ii) an inner joint section formed by a central rotatable section and a leg section depending therefrom,
(iii) means for rotatably securing together said central rotatable sections of said outer and inner joint sections;
(d) securing means for removably securing said leg sections of said joint means to upper ends of said first through fourth legs;
and
(e) a scaffold platform for use with said combination folding ladder and height adjustable scaffold when said joint means is removed from said upper ends of said first through fourth legs and said first and second assemblies are separated, said scaffold platform including:
(i) first means at one end of said platform for supporting said one end on at least one said rung of said first assembly, and
(ii) second means at the opposite end of said platform for supporting said opposite end on said means for connecting of said second assembly, so as to provide a stable scaffold with said first assembly, said second assembly separated therefrom and said scaffold platform connecting together said first and second assemblies.

14 more elements

A combination folding ladder and height adjustable scaffold, comprising:

(a) a first assembly including:
(i) a first leg,
(ii) a second leg, and
(iii) a plurality of rungs connecting together said first and second legs in substantially parallel, spaced apart relation;
(b) a second assembly including:
(i) a third leg,
(ii) a fourth leg,
(iii) means for connecting together said third and fourth legs in substantially parallel, spaced apart relation and for providing a scaffold support;
(c) upper ends of said first through fourth legs each include at least one through hole extending therethrough;
(d) joint means removably secured to upper ends of said first through fourth legs for pivotally securing said first and second assemblies together, said joint means including:
(i) an outer joint section formed by a central rotatable section and a leg section depending therefrom, said leg section including at least one bolt hole extending therethrough;
(ii) an inner joint section formed by a central rotatable section and a leg section depending therefrom, said leg section including at least one bolt hole extending therethrough;
and
(iii) means for rotatably securing together said central rotatable sections of said outer and inner joint sections;
(e) securing means for removably securing said joint means to upper ends of said first through fourth legs, said securing means including bolt means extending through said at least one bolt hole of said leg sections of said outer and inner joint sections and said at least one through hole in said upper end of each respective leg, and nut means threadedly engageable with said bolt means for removably securing said joint means to upper ends of said first through fourth legs;
and
(f) a scaffold platform for use with said combination folding ladder and height adjustable scaffold when said joint means is removed from said upper ends of said first through fourth legs and said first and second assemblies are separated, said scaffold platform including:
(i) first means at one end of said platform for supporting said one end on at least one said rung of said first assembly, and
(ii) second means at the opposite end of said platform for supporting said opposite end on said means for connecting of said second assembly, so as to provide a stable scaffold with said first assembly, said second assembly separated therefrom and said scaffold platform connecting together said first and second assemblies.

16 more elements

A combination folding ladder and height adjustable scaffold, comprising:

(a) a first assembly including:
(i) a first leg including an outer telescoping member and an inner telescoping member which telescopically slides therein,
(ii) a second leg including an outer telescoping member and an inner telescoping member which telescopically slides therein, and
(iii) a plurality of inner rungs connecting together said inner telescoping members of said first and second legs in substantially parallel, spaced apart relation;
(iv) a plurality of outer rungs connecting together said outer telescoping members of said first and second legs in substantially parallel, spaced apart relation;
(b) a second assembly including:
(i) a third leg including an outer telescoping member and an inner telescoping member which telescopically slides therein,
(ii) a fourth leg including an outer telescoping member and an inner telescoping member which telescopically slides therein,
(iii) a plurality of inner rungs connecting together said inner telescoping members of said third and fourth legs in substantially parallel, spaced apart relation;
(iv) a plurality of outer rungs connecting together said outer telescoping members of said third and fourth legs in substantially parallel, spaced apart relation;
(c) joint means removably secured to upper ends of said first through fourth legs for pivotally securing said first and second assemblies together, said joint means including:
(i) an outer joint section formed by a central rotatable section and a leg section depending therefrom,
(ii) an inner joint section formed by a central rotatable section and a leg section depending therefrom,
(iii) means for rotatably securing together said central rotatable sections of said outer and inner joint sections;
(d) securing means for removably securing said leg sections of said joint means to upper ends of said first through fourth legs;
(e) height adjustment means for releasably locking said inner telescoping members of said first through fourth legs at any of a plurality of selected heights with respect to said outer telescoping members of said first through fourth legs;
and
(f) a scaffold platform for use with said combination folding ladder and height adjustable scaffold when said joint means is removed from said upper ends of said first through fourth legs and said first and second assemblies are separated, said scaffold platform including:
(i) a substantially flat rectangular board having short ends and long ends,
(ii) U-shaped support means at said opposite short ends of said flat board on the underside thereof for defining channel means for receiving any of said rungs of said first and second assemblies at a first vertical level so as to support opposite ends of said board, and
(iii) a plurality of hook arms pivotally secured to the underside of said board for receiving any of said rungs of said first and second assemblies at a second vertical level so as to support opposite ends of said board, each hook arm having a hook end for receiving and engaging any of said rungs of said first and second assemblies,
wherein a stable scaffold is provided by said first assembly, said second assembly separated therefrom and said scaffold platform connecting together said first and second assemblies.

19 more elements

Dependencies are inferred from the claim text.

Facts

Application: 07/229,628Filed 8 Aug 1988
Granted: 28 Aug 1990
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

E04G 1/30
Designed to provide support only at a low height: ladder scaffolds
E06C 1/22
With supporting struts formed as poles: with extensible, e.g. telescopic, ladder parts or struts
E06C 1/39
Special constructions of ladders, e.g. ladders with more or less than two longitudinal members, ladders with movable rungs or other treads,…:…
E04G 2001/305
With ladders supporting the platform: the ladders being vertical and perpendicular to the platform

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