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US 4,907,675 AGranted
Modular constructional element in particular of a ladder or scaffolding
OwnerGerard Saby, Frederic Lemercierinventors
Life of this patent
Estimating the term…
Abstract
This modular constructional element (14), which is of the type comprising at least two uprights between which at least one crosspiece extends, is such that each end of the uprights is screw-threaded and adapted to cooperate with a fixing ring (18, 19) for fixing the element (14) to an adjacent means (15).
Claims25
A single ladder comprising at least two axially adjacent modular elements;
- an upper element of said elements comprising two spaced-apart uprights, at least one crosspiece extending between and interconnecting the uprights, the uprights having at least a lower screw-threaded end;
- a lower element of said two elements comprising two spaced-apart uprights, at least one crosspiece extending between and interconnecting the uprights of said lower element, the uprights of said lower element having upper screw-threaded ends;
- at least two tapped fixing rings screw-threadedly engaged on the lower screw-threaded ends of the two uprights of said upper element and screw-threaded engaged on the upper screw-threaded ends of said lower element and thereby coupling together the uprights of said upper element and said lower element;
- and
- foot means mounted on lower ends of the uprights of said lower element;
- and
- wherein said foot means comprise a support bar having two openings, two bolts extending through said openings, means defining tapped cavities provided at lower ends of the uprights of said lower element, the bolts being screw-threadedly engaged in said cavities for fixing the bar to said lower element, a tapped sleeve provided at each end of the bar, and a screw-threaded rod, screw-threadedly engaged in said tapped sleeve and a support shoe provided at a lower end of each rod for adapting the foot means to the configuration of the ground.
4 more elements
A single ladder comprising at least two axially adjacent modular elements;
- an upper element of said elements comprising two spaced-apart uprights, at least one crosspiece extending between and interconnecting the uprights, the uprights having at least a lower screw-threaded end;
- a lower element of said two elements comprising two spaced-apart uprights, at least one crosspiece extending between and interconnecting the uprights of said lower element, the uprights of said lower element having upper screw-threaded ends;
- at least two tapped fixing rings screw-threadedly engaged on the lower screw-threaded ends of the two uprights of said upper element and screw-threadedly engaged on the upper screw-threaded ends of said lower element and thereby coupling together the uprights of said upper element and said lower element;
- and
- foot means mounted on lower ends of the uprights of said lower element;
- and
- wherein the foot means comprise two tapped rings screw-threadedly engaged on lower screw-threaded ends of the uprights of said lower element and shoes fixed to said two tapped rings for bearing on the ground.
4 more elements
A multiple ladder comprising at least two single ladders, each of said single ladders comprising a single ladder comprising at least two axially adjacent modular elements;
- an upper element of said elements comprising two spaced-apart uprights, at least one crosspiece extending between and interconnecting the uprights, the uprights having at least a lower screw-threaded end;
- a lower element of said two elements comprising two spaced-apart uprights, at least one crosspiece extending between and interconnecting the uprights of said lower element, the uprights of said lower element having upper screw-threaded ends;
- at least two tapped fixing rings screw-threadedly engaged on the lower screw-threaded ends of the two uprights of said upper element and screw-threadedly engaged on the upper screw-threaded ends of said lower element and thereby coupling together the uprights of said upper and lower element;
- and
- foot means mounted on lower ends of the uprights of said lower element;
- and
- said multiple ladder further comprising two articulation means interconnecting upper ends of the uprights of said upper elements of the two single ladders.
4 more elements
Scaffolding comprising two substantially vertical planes of assembled elements arranged one above the other in each plane, a substantially horizontal work plane and articulation means interconnecting the work plane and said element.
- each of said elements comprising at least two spaced-apart uprights at least one crosspiece extending between and interconnecting said uprights, each upright having opposite screw-threaded ends, and tapped fixing rings screw-threadedly engaged on and interconnecting adjacent ones of the screw-threaded ends of the uprights of the assembled elements.
At least two modular constructional elements in assembled adjacent relation to each other,
- each modular element comprising at least two spaced-apart uprights, at least one crosspiece extending between and interconnecting the uprights, the uprights each having screw threaded opposite ends,
- tapped fixing rings screw-threadedly engaged with adjacent screw-threaded ends of the uprights of the two elements for coupling said uprights,
- one of the screw threads engaged by each ring having a length equal to at least the length of the ring to allow the ring to be substantially completely screwed onto said one screw thread and allow the respective uprights to be substantially fully assembled before subsequently partly unscrewing the ring from said one screw thread onto the other screw-thread of said threads engaged by the ring and thereby coupling together the respective uprights.
Dependencies are inferred from the claim text.