Fire escape – ladder – or scaffold – Platform
Patent
1996-12-30
1999-11-23
Chin-Shue, Alvin
Fire escape, ladder, or scaffold
Platform
1821867, E04G 730
Patent
active
059883189
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a connection hook for the releasable connection of two scaffolding elements, whereby the connection hook, which is stationarily positioned on a first scaffolding element, can support a profiled part of a second scaffolding element, partly covering said part and being interlockable to same.
BACKGROUND OF THE INVENTION
Connection hooks of this type are in particularly great demand for the construction of scaffoldings in order to be able to securely and quickly releasably connect scaffolding frames with one another, platforms, spars, reinforcements and other scaffolding elements, in particular for scaffoldings consisting of premanufactured elements. Whereas the shape of the first scaffolding element at the connecting point for the connection hooks can be generally shaped as desired and only its secure fastening must be guaranteed, the part of the second element, which part is received on the connection hook, in most cases a crossbar or a short bracket on a scaffolding frame, is always designed with a constant cross section adapted to the shape of the hook opening of the associated connection hook.
SUMMARY OF THE INVENTION
The purpose of the invention is to provide such connection hooks, which are needed in very large quantities, in such a manner that they are basically manufactured out of one workpiece, which can be produced via a highly productive process, in particular via an extrusion process, and can be completed in a simple manner with parts, which themselves can be manufactured inexpensively in large quantities or consist of commercially available standard parts.
The purpose is attained according to the invention by the connection hook being designed as a hollow extruded part in cross section, by providing two flat, parallel surfaced stem segments on the hollow extruded port, which stem segments, spaced from one another, receive a flat safety pawl therebetween, by the safety pawl being able to positively lock the part when said pawl is swivelled or moved between the stem segments, locking the cross section of the part in a hook opening provided in the stem segments, and by the stem segments being connected by at least one cross segment, and said cross segment being shaped such that it defines a bearing surface positioned perpendicularly to the cross section of the hollow extruded part and the surfaces of the stem segments in such a manner that it is suited for a flangelike fastening of the connection hook to the first scaffolding element.
Such a connection hook can be manufactured very inexpensively as hollow extruded parts cut transversely with respect to the longitudinal axis of an extruded section, whereby the stem segments do not need to be connected at their end remote from the cross segment, as a rule, however, they are even connected with one another at their end so that the hollow extruded part has a closed cross section. The arrangement allows the safety pawl to be constructed as a simple stamped metal part pivotal on a simple swivel axle consisting of a commercially available bolt, which is stationarily fixed in the stem segments. All parts needed for the connection hook can in this manner be inexpensively manufactured.
The connection hook must be rigidly securely fastened and with little effort to the first scaffolding element. This is achieved when the bearing surface is maintained essentially flat, and is furthermore designed such that the edge of the bearing surface can be welded to the first scaffolding element, for example, when it enables the application of a fillet weld. A sufficient welding seam length can be achieved when the bearing surface in the cross section of the hollow extruded part appears as a crosswise extending surface wider than the remaining section.
The coupling of the two scaffolding elements via the connection hook is, as a rule, already extraordinarily strong because the connection hook is held in its position by the weight of the first scaffolding element. The safety of the connection is improved when the positi
REFERENCES:
patent: 2997767 (1961-08-01), Grover et al.
Chin-Shue Alvin
Krause-Werk GmbH & Co. KG
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