Fire escape – ladder – or scaffold – Stackable – Male and female connecting means
Patent
1983-12-09
1986-07-01
Machado, Reinaldo P.
Fire escape, ladder, or scaffold
Stackable
Male and female connecting means
182179, 403255, 403348, E04G 106
Patent
active
045974721
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a scaffolding system for use in, for example, the building industry, and comprises tubular uprights, jointing pieces and braces which, if necessary, can be inserted in said uprights, connecting beams and ties for said uprights, and fastening means for interconnecting said uprights and connecting beams.
Such systems are used by the building industry as scaffoldings or as components in shuttering systems which, with relatively few standard components, make for the erection of scaffoldings or formwork for casting concrete walls and decks.
Prior art scaffolding systems usually comprise uprights of conventional steel tubing which, if desired, are provided with externally secured yoke-shaped fasteners or formed with holes in the tube walls for the insertion of locking hooks upon mounting of connecting beams and ties for the uprights. Even though, in some cases, the steel has been replaced by less heavy material, such as aluminium, in some prior art scaffolding systems, the components of the scaffolding systems have been formed in the manner usually employed for steel scaffoldings.
An example of a known scaffolding system is disclosed by German Auslegeschrift DE-B2No. 2,237,490 and comprises U-shaped uprights with keyhole-like holes for the insertion of locking hooks at the ends of the connecting beams of the system. These locking hooks are displaceably mounted in the connecting beams and can be clamped in desired position by means of a tension bolt. Such scaffolding systems suffer from many disadvantages; among other things, the mounting takes time because all tension bolts must be tightened, and furthermore the bolts may come loose during use so that the stability of the scaffolding is jeopardised.
The present invention aims at providing an even more rational and economical scaffolding system than prior art scaffolding systems of steel or other material. In short, the present invention thus provides a scaffolding system which comprises tubular uprights having inwardly extending stiffening and guide flanges for guiding such inserted jointing pieces and braces as may be required, and are connected with connecting beams by means of bayonet joints. A bayonet joint of this type has a hole in the upright and a locking, hook which extends from the end of the connecting beam and. which, after it has been turned into its engagement position, is fixed in this position by means of catch displaceably mounted on the connecting beam for movement into locking engagement with said upright. The inwardly extending stiffening flanges in the tubular uprights may have radial recesses disposed at a predetermined distance from the ends of the uprights to receive outwardly extending projections on a jointing piece insertable into the uprights.
A scaffolding system according to the invention comprises tubular uprights, jointing pieces and braces which, if necessary, can be inserted into said uprights, connecting beams and ties for the uprights, and fastening means for interconnecting the uprights and the connecting beams. According to the invention, such a scaffolding system is characterised in that the uprights are in the form of tubes with holes in the tube wall for insertion of a locking hook comprised by the fastening means, and with inwardly projecting stiffening and guide flanges extending over the entire length of the uprights and adapted to guide any jointing pieces and braces inserted in the tube, while maintaining between the tube wall and any jointing pieces and braces inserted in the tube a spacing which is sufficient for accommodating that part of the locking hook which projects into the tube.
A preferred embodiment of the system according to the present invention is characterised in that the fastening means for interconnecting uprights and stringers are in the form of bayonet joints and each comprise one of the holes in the upright, the locking hook secured to the end of the connecting beam and rotatable together therewith, and a catch which is displaceably mounted at the connecting beam e
REFERENCES:
patent: 3330583 (1967-07-01), Kennedy
patent: 3527320 (1970-09-01), Cunningham
patent: 3867048 (1975-02-01), Endzweig
patent: 4133433 (1979-01-01), Wolf
patent: 4140414 (1979-02-01), Buttgeveit
patent: 4334797 (1982-06-01), Wahlin
Chin-Shue Alvin
Machado Reinaldo P.
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