Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Impact driven fastener – e.g. – nail – spike – tack – etc. – Including integral locking means
Patent
1991-04-03
1992-06-16
Wilson, Neill R.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Impact driven fastener, e.g., nail, spike, tack, etc.
Including integral locking means
411451, 411384, 411480, 52512, F16B 1500, F16B 1502
Patent
active
051220229
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a fastening element for fixing insulating sheetings and/or boards to a solid base, having a large-area washer and a tubular extension for the passage and guidance of a fastener engaging in the solid base.
Such fastening elements are used for fastening insulating materials to a solid foundation, as for example in fastening insulating boards to roofs. When materials must be transported to a roof, it may happen that a worker, for example, steps on or near a washer, or that a vehicle or tools ride over the washer. Such locally concentrated forces may cause the free end of the fastener to push through the applied seal, or the washer to push through the roofing applied on the insulating material. A design has already been proposed wherein a tubular extension, in which a bolt is inserted, is arranged on the relatively large-area washer. There the head of the bolt lies within this tubular extension and is arranged relatively deeply countersunk with respect to the upper side of the washer, so that the required bolt length is substantially reduced. The thickness of the insulating materials to be attached can therefore be spanned by the combined effect of the length of the tubular extension and the length of the bolt. In this connection, it has likewise been known that the washer and the tubular extension may be made of two separate parts. In both known designs the possibility exists that the whole fastening element, in the event of loading, may telescope when, for example, a person steps on the washer.
However, in the known designs it is disadvantageous that, depending upon the thickness of the insulating sheetings and/or boards and especially with unlike thickness of the sheetings on a roof, a plurality of different lengths of fasteners, i.e., as a rule bolts, is required, since in the previous design the bolt head must come to rest on the floor of the interior of the tubular extension, since the tubular extension and the washer must be pressed against the upper side of the sheeting. When it does not matter how far such a bolt is screwed into the solid base, this plays less of a role. When the solid base consists, for example, of concrete slabs or of wood with a decorative covering, these bolts cannot be inserted indefinitely far into such base.
The object of the invention, therefore, was to procure a fastening element by which, in a relatively great region, equalization with reference to the thickness of the insulating sheetings is possible, while a telescopic movement between fastener and tubular extension is nevertheless able to take place and the depth of insertion of the fastener in the base cam always remain the same.
This is accomplished, according to the invention, by a fastener having one or a plurality of wave-shaped bulge(s) at its one end region, which fastener is capable of being driven into a prepared hole in the solid base, the end region of the fastener projecting into the tubular extension being provided with a thread, and a bolt nut capable of being introduced through the interior of the tubular extension and screwed onto this end region of the fastener.
In the design according to the invention, therefore, a bolt with a bolt head is no longer used but, rather, a fastener which projects into the interior of the tubular extension and is fixed there by a bolt nut screwed onto it. This makes it possible to place the nut, acting as a locking element, so that the tubular extension and, hence, the large-area washer as well, are fixed in a position in which they are pressed on the upper side of the insulating sheetings and/or boards. Depending upon the thickness of the insulating sheetings and/or boards, the corresponding end region of the fastener will therefore project more or less far into the tubular extension, the special design making tightening or readjustment possible at any time. The fastener, which is driven into a hole in the base, can thus always be inserted into the base to the same extent. Now, whether the insulating sheetings are equally thick over the whole roof, o
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SFS Stadler Holding AG
Wilson Neill R.
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