Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Having separate expander means – Including sleeve and distinct tapered expander
Patent
1983-12-14
1986-09-23
Holko, Thomas J.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Having separate expander means
Including sleeve and distinct tapered expander
411 42, 411 65, F16B 1306
Patent
active
046132643
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to an anchor bolt for engagement in a socket in a receiving material, thereby to clamp an object, such as a profiled beam, to the material.
BACKGROUND ART
Such an anchor bolt normally comprises a threaded anchor rod which is provided with an expansion body at its threaded end on which is mounted an expandable sleeve, the body being structured so that as the anchor rod is moved axially of the expansible body, with the head of the rod in abutment with the object to be clamped, the sleeve is expanded into gripping contact with the socket.
It is known to position a tubular sleeve between the head of the anchor rod and the expansion body, the tubular sleeve occupying the space between the inner wall of the socket and the rod thus enabling the anchor bolt to withstand high shear loads.
In practice a hole of the required diameter is first drilled in the receiving material and the anchor bolt is hammered into the drilled hole through a correspondingly sized hole in the object to be clamped.
The anchor rod is then torqued-up thereby to set the anchor bolt. Once the required anchorage has been achieved further axial movement of the rod is impeded because the sleeve is in abutment both with the expansion body and the head of the anchor rod.
When this condition is achieved, no axially acting force component remains available to enable the object to be clamped to be pulled down against the receiving material.
SUMMARY OF THE INVENTION
It is an object of the invention therefore to remove the disadvantages of the prior art by providing an anchor bolt which while having the ability to withstand high shear loads, ensures that the object being clamped is pulled down against the bare material so that the fixing is able to withstand vibrational loads.
According to the invention there is provided an anchor bolt for engagement in a socket in a receiving material to clamp an object thereto and comprising a threaded anchor rod, an expansion body threadedly received on the rod, an expansible sleeve on the expansion body and expandable into gripping contact with the socket as the rod is moved axially therein to draw the body into the sleeve, an abutment on the expansion body and the head of the rod, at least one sleeve between the abutments in spaced relation with the rod and dimensioned to bridge or substantially bridge the abutments when the bolt is anchored in the socket and the object is pulled hard against the receiving material, and spacer means between the abutments on the rod over which the sleeve can slide during said axial movement of the rod to reduce the distance between the abutments such that the space between the sleeve and the rod is occupied or substantially occupied by said spacer means when the bolt is anchored in the socket.
This arrangement obviates the deficiencies of the prior art anchor in that the distance between the respective abutments progressively reduces from the moment the anchor rod is turned in the expansion body first to set the expansion sleeve to the required torque, and then to reduce further axially until the object to be clamped is brought firmly against the receiving material and the sleeve occupies or substantially occupies the distance between the abutments.
Due to the fact that the spacer means is between the outer sleeve and the anchor rod in the anchored or set position, a solid or substantially solid body is formed between the internal surface of the socket and the body of the anchor rod thereby providing the required ability to withstand high shear loads, while the induced load in the bolt from the torque tightening remains substantially to clamp down the fixture and hence maximise the anti-vibration efficiency.
Preferably the spacer means is a coiled spring held between the abutment on the expansion body and the rod head.
Alternatively the spacer means may comprise a pair of spacer sleeves one of which is press-fit within the outer sleeve and in abutment with the anchor head, the other spacer sleeve being arranged for slidabl
REFERENCES:
patent: 1265866 (1918-05-01), Ackerman
patent: 3662644 (1972-05-01), Flesch et al.
patent: 4056037 (1977-11-01), McIntyre
patent: 4140040 (1979-02-01), Modrey
patent: 4293259 (1981-10-01), Liebig
patent: 4315708 (1982-02-01), Liebig
Limbrick Robert W.
McIntyre Douglas O.
Holko Thomas J.
Wilson Neill
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