Fire escape – ladder – or scaffold – With handrail or guard for ladder
Reexamination Certificate
2000-01-04
2001-07-17
Chin-Shue, Alvin (Department: 3634)
Fire escape, ladder, or scaffold
With handrail or guard for ladder
C182S008000
Reexamination Certificate
active
06260662
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a device for allowing a person to safely step off from and onto a climbing track when crossing onto a platform, the roof of a structure, a landing or when leaving or entering a shaft. The device has a guide rail for guiding a catching device, onto which a person negotiating the climbing track can be secured, and an extension piece of the guide rail at the top end of the guide rail.
2. Description of the Prior Art
The accident prevention regulations stipulate that for ladder ends against roof edges, roof slopes or shafts the ladder must project by 1 m. A ladder with such a projection is known from DE-U-88 09 386. The projection or the extension is arranged swivellable about a vertical axis at the top end of the ladder. This device is not suitable for dormer windows or shaft coverings, as the shaft covering or the skylight would collide with the projection. For shaft coverings and skylights, the projection was housed separately up until now and attached to the top of the ladder when being used.
OBJECTS AND SUMMARY OF THE INVENTION
The object of the invention is to create a device for safely stepping off from a climbing track which is easy to operate and does not require a ladder extension to be attached.
According to the invention this object is achieved in that the extension of the guide rail can be moved between a first position and a second position, the extension piece being so arranged in the first position that it does not project significantly above the guide rail, and in the second position providing an aligned upward extension of the guide rail in alignment with the latter.
Because the extension piece of the guide rail can be moved between two positions, it is no longer necessary to store or to carry the extension piece separately.
The extension piece of the guide rail can be linked to the top end of the guide rail by means of a hinge. The arrangement is particularly space-saving if the extension piece is housed behind the guide rail in a vertically moveable manner. In order to create a connection to the top end of the guide rail, the extension piece is preferably developed as a hinge swivellable about a vertical axis. When used, the extension piece is firstly pulled or pushed up as far as a stop and then rotated by 180° about the vertical axis and then fitted onto the end of the securely mounted guide rail. By means of centering brackets on the top end of the securely attached guide rail, a mis alignment between the extension piece and the guide rail is prevented and a safe crossing of the connection point with a catching device is guaranteed.
In order to bring the extension piece into the first or at-rest position, the extension piece is lifted, swivelled by 180° and then lowered or retracted. In the first position, the extension piece is stowed behind the guide rail in an extremely space-saving way, i.e. in general between the guide rail and the masonry, to which the guide rail is attached.
The extension piece is preferably attached to a pipe which is arranged vertically displaceable by two pairs of guide rolls and is rotatable about its longitudinal axis.
The two pairs of guide rolls are preferably housed at the top end of the securely attached guide rails.
The device according to the invention is particularly suitable for use with single-spar or central-spar ladders with fall-prevention means, as means known from DE-A-19 61 757. The pipe to which the extension piece is attached can be housed parallel and at a small distance behind the central-spar by means of the guide rolls with such a central-spar ladder.
REFERENCES:
patent: 3523591 (1970-08-01), Fountain
patent: 3598200 (1971-08-01), Thompson
patent: 4546855 (1985-10-01), Lyons
patent: 4709783 (1987-12-01), Tomioka
patent: 5282339 (1994-02-01), Devlin et al.
patent: 5931258 (1999-08-01), Lorentz
patent: 1 961 757 (1971-06-01), None
patent: 27 36 037 (1979-02-01), None
patent: 33 22 298 (1984-07-01), None
patent: 88 09 386 (1988-12-01), None
patent: 0 168 021 (1985-07-01), None
patent: 2 691 488 (1992-05-01), None
“Fallschutzsysteme Sicherheitsgeschirre Steigeisen; Announcement,”HACA, pp. 1-44 (Mar. 1990).
Keller Thomas
Meister Klaus
Chin-Shue Alvin
Hoffmann & Baron , LLP
Soll GmbH
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