Automatic ladder for attic access

Details Automatic ladder for attic access Automatic ladder for attic access

2007-02-06

2010-11-30

Mitchell, Katherine W (Department: 3634)

Fire escape, ladder, or scaffold

Door and ladder

C182S078000

Reexamination Certificate

active

07841448

ABSTRACT:
An access panel is shown in the present invention to provide easy and safe access to an attic space or elevated structure. The access panel is fully automatic. During opening, the access panel only uses gravitational forces for opening a cover. Only during closing is the access panel motorized. The gravitational forces are used to both open the cover and extend the ladder sections, while the motor is only used to retract the latter sections and close the cover. A stow latch keeps the cover closed during non-use. A safety switch keeps the access panel from accidentally opening and the ladder sections from lowering if the stow latch is released. A mechanical lock keeps the cover open when the ladder sections have been lowered.

REFERENCES:
patent: 1811707 (1931-06-01), Bessler
patent: 1811708 (1931-06-01), Bessler
patent: 1811820 (1931-06-01), Bessler
patent: 1858981 (1932-05-01), Bessler
patent: 1867904 (1932-07-01), Bessler
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patent: 3789955 (1974-02-01), Knapp
patent: 6349793 (2002-02-01), Kincaid
patent: 6802392 (2004-10-01), Davis
patent: 6866118 (2005-03-01), Battenberg
patent: 6886661 (2005-05-01), Battenberg

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