Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Externally threaded fastener element – e.g. – bolt – screw – etc. – Multipart
Patent
1988-09-21
1991-11-19
Wilson, Neill R.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Externally threaded fastener element, e.g., bolt, screw, etc.
Multipart
411387, 411533, 52512, F16B 3502
Patent
active
050661817
DESCRIPTION:
BRIEF SUMMARY
CROSS-REFERENCE TO RELATED APPLICATIONS
This application is a continuation-in-part application of another international application filed Jan. 13, 1988 under the Patent Cooperation Treaty and bearing application No. PCT/EP88/00020. The entire disclosure of this application, including the drawings thereof, is hereby incorporated in this application as if fully set forth herein.
The invention relates to an attachment element comprising a large washer having a built-on tubular extension for the passage and guidance of a screw.
Attachment elements of this kind are normally used to secure insulating materials to a fixed base, e.g. for attaching insulating panels to roofs. If materials have to be transported on a roof, a workman may happen to step upon a washer or near it, or a vehicle or tools may travel over the washer. Local forces of this kind cause the head of the screw to pass through the applied sealing material or the washer to pierce the roofing material applied to the insulating material.
It has already been proposed to provide a stop at a distance from the head of the screw in the thread-free shaft-section, so that the area of the washer defining the opening can rest upon this stop and be adapted to tilt in relation to the axis of the bolt. Although this design was very successful, it must be regarded as a disadvantage that the screws must be relatively long, depending upon the thickness of the insulating material, since they must extend from the washer to the fixed base.
Attachment elements of the type mentioned at the beginning hereof are disclosed, for example, in DE-A-35,39.752 (subsequently published) and in AI-8-380.051; also in GB-A-1.499.224. In the case of another known design, a tubular extension is provided for the relatively large washer, into which the screw is inserted. The head of the screw lies within this tubular extension and is relatively deeply embedded in relation to the upper surface of the washer and this shortens the necessary length of the screw. The thickness of the insulating material to be secured may therefore be bridged by co-operation between the length of the tubular extension and the length of the screw. One disadvantage of this design, however, is that such washers, with their tubular extensions, are awkward to store and are too bulky for transportation and packaging. With a design of this kind, therefore, only a single setting-operation is possible, a screw being inserted into the washer, with its extension, whereupon individual screwing may take place at the relevant location. With this variant, prestorage of the washers and screws in a magazine is unthinkable.
It is therefore the purpose of the present invention to provide an attachment element of the type mentioned at the beginning hereof which is very simple to produce, can be packaged and transported in the best possible manner, and can be used in an economically optimal manner.
According to the invention, it is proposed, to this end, that the washer and the tubular extension be designed as separately produced parts, that the tubular extension comprise, at the end thereof facing the washer, a shoulder, projecting lugs, pins, nobs or the like; that the section of this tubular extension adjoining this end correspond approximately to the diametrical cross-section of an opening in the washer; that the free internal diameter of the extension correspond approximately, over the greatest length thereof, to the outside diameter of the head of the screw to be used; and that the free end of the extension be constricted to produce a friction-hold between the extension and the shank or the outside diameter of the thread of the inserted screw, so that the said tubular extensions, with inserted screws, can be prestored in a magazine.
These measures according to the invention make it possible, on the one hand to manufacture the washer and tubular extension out of any desirable materials, so that the properties thereof may be used optimally according to the application. It is also possible for the matched lengths of the screw a
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patent: 4361997 (1982-12-01), DeCaro
patent: 4642012 (1987-02-01), Blucher et al.
patent: 4726164 (1988-02-01), Reinwall et al.
patent: 4757661 (1988-07-01), Hasan
patent: 4862664 (1989-09-01), Romine
Kasper Horst M.
Stadler AG
Wilson Neill R.
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