Fire escape – ladder – or scaffold – Scaffold supported internally on shaft
Patent
1984-12-18
1987-09-22
Machado, Reinaldo P.
Fire escape, ladder, or scaffold
Scaffold supported internally on shaft
182142, E04G 310
Patent
active
046949330
DESCRIPTION:
BRIEF SUMMARY
OBJECT OF THE INVENTION
The invention concerns a self-propelled scaffold for buildings exhibiting a continuous outline, this scaffold comprising a scaffolding and a working platform arranged at a horizontal bracket of the scaffolding. The invention furthermore relates to a rope winch with two clamping units that can be moved with respect to each other and are opened and closed in phase opposition; this rope winch can be used with advantage, for example, in the self-propelled scaffold of this invention. Finally, the invention relates to a process for the construction and/or servicing of high buildings, the realization of which is particularly facilitated by the scaffold and rope winch according to this invention.
STATE OF THE ART
The scaffold required for work to be performed on high buildings has posed an unsolved problem for a long time. Thus far, a large number of movable scaffolds, operating on the basis of a great variety of principles, has become known pertaining to one of the following two groups:
So-called suspended scaffolds are widely utilized wherein the scaffolds are attached to a stable suspension point, for example to a roof or a bracket. These suspension points must, of course, be at a higher level than the plane of the work being performed. These conventional devices thus not only exhibit the disadvantage that a load-bearing suspension point, a roof construction or a bracket, must be present, but also that the work operation can be executed only along a vertical strip along the building, and the devices proper are labile, unstable, and of low load-bearing capacity. A good example in this connection is disclosed in Austrian Pat. No. 330,437 wherein a working basket is suspended on the upper rim of a water tower.
The other group of movable scaffolds includes the so-called supported scaffolds transmitting their load to a steel construction independent of the building to be worked on. However, this feature is a cause for many deficiencies. The working platform is rigid; it does not follow the shape of the building, either in the vertical or horizontal direction. A supported scaffold is described in Russian Pat. No. 918,407.
The provision of a working platform all around the periphery of the building is impossible with the movable scaffolds known heretofore. Thus, the working operations with their aid, the repair work, servicing work, or any assemblies can only be carried out in vertical strips, in stages. It is not possible, either, to circumvent the building. The conventional solutions are furthermore also burdened by static disadvantages, making it necessary to over-dimension the structure to overcome such disadvantages.
As will be described in greater detail below, a rope winch is likewise required for solving the problem according to this invention in connection with the scaffold. Such utilization alone absolutely necessitates a further development of the conventional rope winches, as will be explained hereinbelow.
In most cases, block and tackle systems, powered manually or by a motor, are used for the tensioning of ropes, the rope being wound up on a cylindrical drum. A long threaded bolt is likewise known, connected to two helical spindles with oppositely oriented pitches, the two ends of the rope to be tensioned being joined to the helical spindles. These solutions can be utilized only in the simplest cases.
A greater tensile force can be exerted by a construction, likewise conventional, wherein respectively one series of rollers is arranged on two axles, and the rope is guided over the rollers alternatingly on one and the other axle. Tensioning of the rope is effected by moving the two axles away from each other, for example with the aid of hydraulic operating cylinders, after tightening the rope. This construction is not only relatively complicated and heavy, but the velocity of the rope also increases with an increasing number of rollers since the latter are so-called multiplier rollers.
In all of the rope winches known heretofore, tensioning is possible only along a limited lengt
REFERENCES:
patent: 350289 (1886-10-01), Brown
patent: 351143 (1886-10-01), Wittingham
patent: 2906365 (1959-09-01), Howard
patent: 4060358 (1977-11-01), Fougea
Chin-Shue Alvin
Kisuzemi Innovacios Iroda
Machado Reinaldo P.
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