Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Threaded fastener locked to a discreet structure – Nut – and means to engage substructure on its opposite faces...
Patent
1992-11-05
1994-05-03
Wilson, Neill R.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Threaded fastener locked to a discreet structure
Nut, and means to engage substructure on its opposite faces...
411510, 411908, 411913, F16B 1900, F16B 3704
Patent
active
053082052
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a dowel-like retaining peg of plastics material which may be fitted by pressing or driven into a bore, particularly for fastening furniture fittings to articles of furniture, with an elongate peg portion from whose outer peripheral surface a number of peripheral annular projections extend radially, offset in the longitudinal direction of the peg and with a triangular cross-section tapering towards the exterior and defining a respective knife blade-like retaining ridge.
Furniture fittings, for instance, are fastened by means of such plastic retaining pegs to the walls of articles of furniture. If the fittings or fitting members are of plastic and manufactured by an injection moulding method the retaining pegs can be directly integrally injection moulded on the fitting (DE-A 2457172; DE-A 2457022), whilst they are separately manufactured and connected, e.g. screwed, to the fittings which are to be fastened for the purpose of attachment to metallic fittings (DE-B 2727962). The retaining pegs are inserted into bores provided in the fastening region of the article of furniture, whereby a solid loadable fit is ensured e.g. by oversizing the peg diameter with respect to the diameter of the fastening bore. The retaining pegs can be pressed or driven into the associated fastening bore with a radial diameter reduction due to the elasticity of the plastic material which is used and/or the provision of partial longitudinal slots. As a result of peripheral annular projections of saw tooth-shaped cross-section which are provided on their peripheral surface a resistance to tearing out of the retaining pegs is achieved which exceeds the resistance to being pressed in since the peripheral retaining ridges of the saw tooth annular projections have the tendency when subjected to such tearing out forces to dig into the material of the wall of the bore. The resistance to tearing out which may be achieved is however not in many cases sufficient for the loads which occur in the course of time, since particularly with wooden materials a change in the dimensions of the wooden wall of the article of furniture and thus of the bore can occur--e.g. due to drying out or the absorbtion of moisture from the environment. Under high loads, instead of the pushed or driven pegs described above, retaining pegs are therefore also used which may be expanded after insertion into the associated fastening bore by means of a separate expanding body and thus, even when they have no or only a small oversize with respect to the diameter of the fastening bore, have an enlargeable diameter after insertion into the bore so that the necessary tight fit is ensured. Subsequent tightening in the event of looseness occurring as a consequence of an increasing diameter of the fastening bore caused by external influences is also possible with such expansible dowel-like retaining pegs. This high load-bearing ability and subsequent tightening ability are however bought at the expense of a more complex construction and thus an increase in expense of the retaining pegs. Furthermore, the solidity of the fit of the retaining pegs in the fastening bores which is actually achieved also depends on the expansion force which is individually exerted during the installation. For an optimally solid fit without damage to the bore wall a certain experience of the installer is thus also necessary which can nowadays no longer be assumed in all cases.
With this background it is the object of the invention so to develop the known retaining pegs which are retained in the fastening bore by their oversize that they can be installed simply and rapidly, even by inexperienced personnel, whereby a lastingly solid fit is to be achieved with an increased resistance to tearing out.
In accordance with the invention this object is solved if the peg portion has a substantially smaller diameter over the major portion of its longitudinal extent with respect to the diameter of the associated bore, if the peripheral annular projections are constructed as annular disc-shaped
REFERENCES:
patent: 3466966 (1969-09-01), Brown
patent: 3494244 (1970-02-01), Wayland
patent: 4381633 (1983-05-01), MacLeod
patent: 4579492 (1986-04-01), Kazino et al.
patent: 4810144 (1989-03-01), Martelli
patent: 4906152 (1990-03-01), Kurihara
patent: 5065490 (1991-11-01), Wivagg et al.
MEPLA-Werke Lautenschlager GmbH & Co. KG
Wilson Neill R.
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