Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Internally threaded fastener element – e.g. – nut – etc. – Having cap
Patent
1999-02-01
2000-10-24
Saether, Flemming
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Internally threaded fastener element, e.g., nut, etc.
Having cap
411428, 4113726, 411377, F16B 3714
Patent
active
061356913
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to protective caps for bolts with nuts and in particular relates to protective caps for bolts with nuts protruding from a surface against damaging effects such as corrosion from the surrounding environment.
BACKGROUND OF THE INVENTION
There are many situations where nut and bolt systems of securing are adopted. For example removably securing two pieces of metal objects, valve and flange systems, mounting metal structures onto a receiving base or foundation, machinery parts, etc. usually involve the adoption of a nut and bolt system for securing two or more parts. Such bolt and nut assembly combination is often exposed to deterioration enhancing agents such as water, salt water, acids, alkali and other chemicals present in the ambience. The external effects as aforesaid, such as corrosion, rust, built up of deposits etc. reduce the advantage of such nut and bolt securing system. Nut and bolt systems subjected to prolonged environmental forces are difficult to dissemble. To separate the parts secured together, would then often necessitate expensive time consuming procedures like using of cutting torches, hack saws, etc. Such destructive removal procedures are unproductive and expensive.
To overcome such disadvantages, various methods and/or products have been introduced. One such product used is protective cap. One such protective cap is described in Norwegian Patent No. 157152 and in PCT publication-international application number 8400033. Currently available protective caps are produced for each dimension of nut and bolt, thus making such caps relatively expensive
Thus it is an object of the present invention to provide universal nut and bolt protective caps for predetermined range of nut and bolts.
SUMMARY OF THE INVENTION
A protective device for bolt and nut assembly used to secure structures together comprising of a tubular cap closed at one end and open at the other end, the said open end being broader than the closed end and the device includes an intermediate connector nut with an upright shaft portion threaded on the inside surface and a flange portion at the base of the shaft portion wherein the an intermediate connector nut is introduced onto the bolt portion to provide a tight fit and the tubular cap is introduced over the exposed part of the bolt.
In another aspect the invention includes a substantially hemispherical body, with a housing chamber to accommodate a connector nut, the connector nut with a central aperture to receive a bolt and wherein the connector nut is introduceable into the housing chamber which sub-assembly is the secured onto the bolt and nut assembly.
Yet in another aspect the invention includes a two part device, comprising of a skirt part dimensioned and configured to fit over the nut and integral with first tubular shaft portion and a second tubular shaft portion open at one end and closed at the other end wherein the skirt part is fitted over the nut and bolt assembly and the second tubular shaft portion is fitted over the skirt part in a tight fitting manner.
The invention also includes a tubular shaft member closed at one end and open at the other end and screw threaded to fit over the bolt and a shaft and skirt member integrally connected wherein the shaft and skirt member is telescopically fitted over the tubular shaft member and wherein in a fitted position the skirt portion of the shaft and skirt member extends over the nut.
In another aspect the invention includes a substantially hemispherical body with a tubular member extending downwards from the upper part of the inside ceiling of the said hemispherical body wherein in a fitted position, the tubular member is secured over the bolt and the hemispherical body covers the nut.
Yet in another aspect the invention includes a tubular cap closed at one end and open at the other end, the said open end being broader than the closed end; the closed end of the tubular cap includes a one way valve means and the open end is dimensioned and configured to fit over the
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Mohd Nor A. Rahim
Nadarajah Nagendran
Petronas Research and Scientific Services Sdn. Bhd.
Romilly International Ltd.
Saether Flemming
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