Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Having separate expander means – Made up of plural expansible segments or sections
Patent
1996-05-28
1997-06-03
Wilson, Neill R.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Having separate expander means
Made up of plural expansible segments or sections
411 61, 411 74, F16B 1304, F16B 1306
Patent
active
056347502
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to an expansible anchor made of metal for anchoring in a hole drilled in a component.
Expansible anchors of that kind are especially suitable for use in hard building materials; by screwing a nut onto the threaded shank projecting beyond the component and the article to be fixed, the expander cone integrally formed with the shank is drawn into the expansible sleeve bearing against the wall of the drilled hole. The expansible sleeve is consequently expanded and becomes wedged in the drilled hole. The expansible sleeve is braced in the drilled hole by integrally formed locking elements, which grip the wall of the drilled hole.
DE PS 41 17 238 discloses an expansible anchor of that kind having two cones over each of which is mounted an expansible sleeve. The expansible sleeve is provided with tunnel-like, convex beads projecting outwards that extend approximately as far as the centre of the expansible sleeve, and also a continuous longitudinal slit and several axially arranged incisions.
Although that known expansible anchor makes possible slip-free anchoring, it requires the use of a relatively large amount of energy to drive it in to overcome the resistance to insertion.
Studies have shown that the relatively rigid outer surface of the bead has an adverse effect on the insertion behaviour of the anchor. The reason for this is that the outer surface of the bead has two different regions: a rear region that behaves resiliently during the insertion of the anchor and a rigid front region. The rigid region of the bead presses hard and consequently creates large amounts of friction against the concrete and makes it difficult to drive the anchor into the drilled hole.
SUMMARY OF THE INVENTION
The invention is based on the problem of providing an expansible anchor of the kind mentioned at the beginning that can be inserted more easily and that ensures reliable fixing in the tensile zone of a concrete part.
That problem is solved by an expansible anchor for anchoring in a hole drilled in a component, consisting of a shank which at its rear end has means for fixing an article and at its front end has at least two portions of reduced cross-section with adjoining expander cones and, positioned over each reduced neck portion, an expansible sleeve on which are mounted at least two convex beads projecting radially outwards, wherein in accordance with the present invention the beads are provided with one or more openings, and the diameters of the reduced neck portions are different.
By providing an opening in the bead region, the rigidity of the bead is reduced. In particular, as a result of the reduction in area in the rigid region of the bead, the resistance to insertion is reduced and the anchor can be driven in more easily. The opening can have the form of a punched circular bore, giving the bead a tooth-like form. The outer edge of the bore acts as a locking edge and holds the expansible sleeve in the drilled hole so that it is immovable in the radial and axial directions while the expander cone is being drawn in. As a result of the sharp edges biting into the wall of the drilled hole, the expansible sleeve grips the wall of the drilled hole more strongly and consequently becomes fixed.
The sleeve comes to a standstill when torque is applied and the bolt is drawn into the sleeve.
With anchors of a relatively large diameter it is advantageous to provide an additional opening in the resilient region of the bead. The rigidity of the bead is thereby reduced still further and the behaviour of the anchor when being driven in is further improved.
As a result of the front neck portion's being thinner than the rear neck portion, in that area the play between the expansible sleeve and the neck is increased. That enables the expansible sleeve to be deformed inwardly more easily and to be better matched to the angle of the cone. That in turn improves the sliding of the expansible sleeve on the cone and ensures uniform good subsequent expansion behaviour in the event of the dri
REFERENCES:
patent: 4688977 (1987-08-01), Seetaram
patent: 4806053 (1989-02-01), Herg
patent: 5211512 (1993-05-01), Frischmann et al.
patent: 5314278 (1994-05-01), Weber
Anisi Aboulhassan
Frischmann Albert
Steurer Paul
Striker Michael J.
Upat GmbH & Co.
Wilson Neill R.
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