Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Having separate expander means – Including sleeve and distinct tapered expander
Patent
1983-12-14
1987-03-17
Smith, Gary L.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Having separate expander means
Including sleeve and distinct tapered expander
411 50, 411 57, F16B 1306
Patent
active
046503846
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to an expansion anchor for setting in a receiving socket.
BACKGROUND ART
Such expansion anchors are normally internally threaded for engagement by a threaded anchor bolt. The expansion anchor itself generally comprises an expansion body or sleeve on which is mounted an expansible body which can be expanded into gripping contact with the receiving socket by means of the expansion body being drawn within the sleeve by the threaded anchor being turned in the expansion body.
An expansion anchor is known which is provided with an expansible sleeve mounted on a waisted portion of an internally threaded tubular body between two abutments, one of which is tapered to provide a wedging effect when the tubular body is drawn axially of the sleeve by a threaded anchor bolt, to expand the sleeve into gripping contact with the receiving socket.
These prior known expansion anchors lack versatility of application and their manufacture tends to be a costly procedure and unnecessarily complicated.
SUMMARY OF THE INVENTION
It is an object of the invention amongst other things to provide an expansion anchor which by its less complicated design is cheaper to manufacture than the prior art device, and is more readily adaptable for use in anchorage fixings where high shear loads and vibrational forces are to be encountered and for which the fixing has to be designed to withstand.
According to one aspect of the invention there is provided an expansion anchor for setting in a receiving socket comprising a tubular sleeve which is split longitudinally, a plurality of longitudinally arranged slits or slots in the body of the sleeve to provide an expansible forward region thereof, a threaded expansion body which can be drawn within the sleeve to expand said front region by a threaded anchor rod to set the anchor, and a tubular support member engaged within a rearward region of the sleeve for supporting the shank of said anchor rod passing through the sleeve, said expansion body being provided with lugs which engage said slits or slots and retain the expansion body to the sleeve when in an unexpanded state.
One of the advantages of the above arrangement is that since the sleeve for retaining the expansion body and collar in assembly, is split longitudinally, it can be formed by first of all pressing out a piece of flat material, cutting the required number of slits or slots in the flat piece of material and then rolling the prepared piece into a tubular form, the slits or slots providing a forward expansible region of the sleeve.
The expansion anchor as above defined is particularly useful in applications where high shear loads and vibrational forces are to be encountered.
To this end the tubular support member may constitute a spacer element between the tubular sleeve and the anchor rod threadedly engaged in the expansion body.
Thus as the anchor rod is torqued up to the set position in a receiving socket, the spacer element moves within the tubular sleeve to eventually contact or substantially contact the expansion body which itself is being pulled within the tubular sleeve to effect expansion thereof.,
The relative dimensions of the component parts may be such that in the fully set condition, with an object to be clamped pulled hard against the receiving surface, the space between the body and the anchor rod and the tubular sleeve is occupied by the support member and the expansion body thus imparting rigidity to the structure.
Moreover to reach this condition none of the applied torque goes to uselessly loading the tubular sleeve due to the ability of the head of the anchor rod to continue moving relative to the expansion body up to the fully set position of the anchor, that is prior to the set position such relative movement is not impeded by contact between the head of the anchor rod and the tubular sleeve.
Other features and advantages of the present invention will become apparent from the description that follows.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will
REFERENCES:
patent: 3911782 (1975-10-01), Liebig
patent: 4100834 (1978-07-01), Harris
patent: 4478542 (1984-10-01), Whelan
patent: 4537541 (1985-08-01), Giannuzzi
Limbrick Robert W.
McIntyre Douglas O.
Smith Gary L.
Whitcomb, Jr. Adrian H.
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