Connection between a ladder side rail and a hinged arm of a ladd

Details Connection between a ladder side rail and a hinged arm of a ladd Connection between a ladder side rail and a hinged arm of a ladd

1996-12-16

1999-04-06

Chin-Shue, Alvin

Fire escape, ladder, or scaffold

Unitary foldable, rigid scaffold or ladder

Collapsible ladder

F16C 1100

Patent

active

058905618

ABSTRACT:
The connection between the ladder side rail (3) and the hinge arm (2) is performed through a form-matching and/or force-matching joining connection (F.sub.N, F.sub.V) in the corner regions (5, 6) of the profile of the hinge arms (2) and of the ladder side rails (3) and/or in their profile sides (2.2, 3.2), which are disposed substantially parallel to the hinge axis (AG). An optimum force transfer from the ladder side rail (3) to the hinged arm (2) is assured based on the novel arrangement of the joining connection (F.sub.N) and (F.sub.V). A deformation of the ends of the ladder side rail (3), which ends are connected to the hinged arms (2), is nearly excluded. A simple, economic, and at the same time reliable connection is created in particular by the production of the joining connection (F.sub.V) with a suitable deformation method.

REFERENCES:
patent: 511744 (1894-01-01), Andrew
patent: 4666327 (1987-05-01), Su
patent: 4842098 (1989-06-01), Yuen
patent: 4928792 (1990-05-01), Krause

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