Positive arrangement for fastening a dowel

Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Having separate expander means – Made up of plural expansible segments or sections

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Details

411 54, 411 57, F16B 1304

Patent

active

046905979

DESCRIPTION:

BRIEF SUMMARY
The invention relates to a positive fastening arrangement for a dowel in a hole in a sub-surface, in which the said hole, in the form of a blind, cylindrical bore, is provided at a distance from its mouth, in the sub-surface, with an expansion comprising an undercut surface extending radially and rearwardly towards the mouth of the hole, the said dowel comprising a head part of approximately the same diameter as the hole, arranged at the end of an elongated fastening bolt and adapted to be introduced into the hole, the ends of the locking elements, at the inner end of the hole, being mounted pivotably upon the said head part, the rearwardly projecting ends of the said locking elements being adapted to pivot from a position within the diameter of the hole to a position in which they project at least partly out of the diameter of the said head part and in which they engage lockingly in the said undercut surface in the hole, the said fastening bolt comprising, at its outer end, a bolt head, or a nut screwed to a thread on the said fastening bolt, a component, tapering conically towards the interior of the hole and engaging between the ends of the said locking elements, pointing towards the mouth of the hole in such a manner that when the head part is displaced towards the mouth of the hole, the ends of the locking elements, pointing towards the mouth of the hole, are pivoted positively and radially outwardly.
The Applicant has developed dowels of the above mentioned type (German No. OS 27 58 091; German No. OS 29 06 914) for fastening arrangements of this kind which were also of great interest for purposes for which known and proven expanding dowels could not be used for reasons of safety. One major advantage of the newly developed dowels is that they provide positive anchorage without expansion pressure. However, as compared with expanding dowels, positive setting dowels are of complex design which makes them more costly to produce and limits their use accordingly. Moreover, the production of an undercut surface in the preliminary bore requires additional labour.
In contrast to this, it is the purpose of the invention to simplify the design of known positive setting, expansion pressure free dowels, without impairing the function thereof, thus making it possible to produce them at a lower price and with smaller dimensions than heretofore.
Base upon a fastening arrangement of the type mentioned at the beginning hereof, this purpose is achieved, according to the invention, in that the head part and the locking elements are integral parts of a sleeve like anchoring component carrying a wedge shaped peripheral groove in its outer surface, the wall of said anchoring component being divided into a number of segmental sections by a series of slots recessed from the front edge, at uniform angular spacing, in parallel with the centre line, as far as the said peripheral groove, the said segmental sections constituting the said locking elements, while the remaining unslotted part of the said anchoring component forms the said head part. The one piece anchoring component may be produced quite simply, from the production point of view, on automatic cutting machine tools, being turned from the raw material. This eliminates the assembly of separately produced locking elements to the head part, as required in the case of known dowels.
According to one advantageous development of the invention, it is desirable for the length of the dowel, as measured from the end face, in the interior of the hole, of the head part to the end face, at the mouth of the hole, of the distance sleeve, to be approximately equal, when the locking elements are pivoted inwardly, to the depth of the preliminary bore plus the thickness of the workpiece to be fastened, and of the dimension of the travel provided to allow the locking elements to pivot into the locking position. The setting of the dowel is then a simple matter, in that it is inserted, through the hole in the workpiece to be fastened, into the hole, until the inner end of the dowel is seate

REFERENCES:
patent: 784845 (1905-03-01), Evans
patent: 2385126 (1945-09-01), Benton
patent: 2403330 (1946-07-01), Benton
patent: 3364808 (1968-01-01), Fischer
patent: 3872527 (1975-03-01), Tregoning
patent: 4011786 (1977-03-01), Liebig
patent: 4084454 (1978-04-01), Day
patent: 4122753 (1978-10-01), Kuhlmann
patent: 4293259 (1981-10-01), Liebig
patent: 4330230 (1986-05-01), Giannuzzi
patent: 4408937 (1983-10-01), Hainke et al.
patent: 4416048 (1983-11-01), Otte

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