Fire escape – ladder – or scaffold – Pivotally connected ladders – mutually sustaining
Patent
1978-07-20
1980-08-12
Machado, Reinaldo P.
Fire escape, ladder, or scaffold
Pivotally connected ladders, mutually sustaining
182 22, 182165, 16144, E06C 750, E05D 1110
Patent
active
042168449
ABSTRACT:
A fitting for a joint for two ladder sections, which in all angle positions is adapted to lock automatically. This fitting includes a first and a second fitting part which are respectively connectable to the ends of two side pieces of a ladder section and are pivotable about a common axis. The first fitting part has associated therewith a locking unit or element movable parallel to the axis of the joint against the thrust of a return spring from a locking position into an unlocking position and vice versa, while in the second fitting part for each selectable angle position there is provided a bore for receiving the locking unit in its locking position. The locking unit is held by means of a locking mechanism first in its locked position and subsequently, after one fitting part has pivoted relative to the other fitting part, is held by arc sections between the bores of the second fitting part in its unlocked position. The locking mechanism includes a holding part and a control part of which one part each is associated with one of the bores and is directly provided on the locking unit. The locking unit has at least one locking bolt and one guiding pin having its axis coinciding with the axis of the joint axis. The guiding pin is continuously under the action of a return spring and at its free end includes at least one axial projection movable into engagement with that part of the locking mechanism which is associated with the bore in the second fitting.
REFERENCES:
patent: 3811151 (1974-05-01), Kuemmerlin
Machado Reinaldo P.
Zarges Leichtbau GmbH
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