DE3511784A1 - Expanding anchor - Google Patents

Abstract

The invention relates to an expanding anchor comprising two expanding legs which are held together via a head part, provided with a border for clamping objects firmly, and are provided with a guide which opens into a narrowed portion and is intended for an expanding nail. In order to achieve high retaining values, in particular in soft and porous materials, and to set the expanding anchor in these materials without pre-drilling, the expanding legs are pressed together at their front ends, until the inner expanding-leg surfaces bear against each other, in order to form a taper. Furthermore, a tooth-shaped projection is arranged on both expanding legs at the outermost end of the taper.

Description

Sprei bickering

The invention relates to an expansion anchor consisting of two over one head part provided with an edge for clamping objects held together Expanding legs with a guide opening into a constriction for an expanding nail are provided.

For the assembly of expansion anchors of the above type is to be fastened Object and in the anchor base a corresponding to the diameter of the expansion anchor Borehole required. When making the borehole in a soft and porous Building material, for example aerated concrete, is primarily created in the object to be fastened if it is a wooden slat, a very narrow one and made of aerated concrete existing anchorage ground a very wide borehole due to eruptions and abrasion. It leads in addition, that despite the expansion option of the expansion anchor, only low holding forces can be achieved are. Apart from the fact that a corresponding one for the production of the borehole Expenditure of time is required.

The invention is based on the object of creating an expansion anchor, which by digging deep into the borehole wall, in particular, is softer and more porous Building materials has high holding values and is mounted in these building materials without pre-drilling and can be anchored.

According to the invention this is achieved in that the expansion legs at its front end to form a taper up to the abutment of the inner spreading leg surfaces are compressed, and that at the extreme end of the taper on both spreader legs a tooth-shaped projection is arranged.

When hammering the expansion nail into the expansion anchor set in the anchor base there is already an expansion when the expansion nail penetrates the constriction achieved that of the degree of constriction compared to the expanding nail diameter depends. An additional expansion results in the area of the tapering of the expansion anchor, because at this point the expansion legs up to the contact of the inner expansion leg surfaces are compressed. When pushing the expansion legs apart with the expansion nail the two projections arranged on the spreading legs dig completely into the borehole wall, so that at least in softer building materials in addition to the bracing the expansion leg also has a certain form fit. This results in a lot high holding values even with larger drill holes.

However, it is due to the tapering and rigidity of the expansion legs also possible, this anchor base made of soft and porous building material knocking in without a pilot hole. By displacing the material during the driving process there is a material compression around the expansion anchor, which is in addition to the strong Friction during the subsequent spreading of the expansion anchor by hammering in the expansion nail leads to a further increase in the holding values. Through the one on the head part of the expansion anchor arranged edge of the object to be fastened is held.

Driving the expansion anchor into soft and porous building materials without Pre-drilling is facilitated by the further embodiment of the invention that the Projections on the two expanding legs together form a point.

Finally, the narrowing of the inner spreading leg surfaces can through Imprints of the wall of the expansion legs can be formed. When making the Expansion anchor in the punching and pressing process from a sheet metal strip can with this Design achieved the narrowing necessary for the expansion in a simple manner will.

Exemplary embodiments of the invention are shown in the drawing.

Show it: Figure 1 the expansion anchor with expansion nail FIG. 2 shows the expansion anchor anchored in a soft and porous anchor base, FIG. 3 a Variant of the expansion anchor The expansion anchor 1 consists of two over a head part 2 held together expansion legs 3, the inner expansion leg surfaces over forming part of its length with a guide for the expansion nail 4 each Longitudinal groove 5 are provided. Following the longitudinal grooves 5 form the leg surfaces an initially constant constriction 6 that occurs when driving in the expanding nail 4 allows expansion of the expansion anchor 1. In the front area of the expansion anchor are the two expansion legs 3 up to the contact of the inner expansion leg surfaces compressed, so that with constant wall thickness of the expansion legs a taper 7 of the expansion anchor 1 arises. At the extreme end of the apex 7, a tooth-shaped projection 8 is arranged on each of the two expansion legs 3. The external dimension measured over the two projections 8 corresponds approximately to the external diameter of the expansion anchor 1. As a limit stop and at the same time to clamp a Object 9, the head part 2 of the expansion anchor 1 is provided with an edge 10. To allow the expansion anchor to penetrate into soft and porous building materials without pre-drilling to facilitate, the two projections 8 together form a point 11. The compressed Expansion legs 3 prevent the expansion anchor being driven into the anchor base 12 the penetration of material into the constriction 6, which may lead to premature Spreading.

To drive the expansion anchor 1 through the wooden slat 9 into the anchor base 12, which consists of aerated concrete, for example, is either the sprinkling nail 4 removed or the expansion anchor 1 by means of a tubular impact tool driven in. The expansion anchor 1 is hammered in until the Front side of the edge 10 is flush with the slat surface. Then the one in the Guide held expansion nail 4 driven in. This forces the spreading of the expansion anchor 1 and its anchoring in the anchor base 12 reached, with the projections 8 beyond the outer surface of the expansion legs into the material dig in.

FIG. 3 shows one possibility for spreading the spreading legs 3 necessary constriction 6 through embossments 13 in the wall of the expansion legs 3 to reach. As a result of this measure, the expansion anchor 1 is made from a sheet metal strip can be produced in a simple manner using the punching and embossing process.

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Claims (3)

PATENT CLAIMS 1. Expansion anchor consisting of two over one with one Edge for clamping objects provided with head part held together spreading legs, which are provided with a guide for an expansion nail opening into a constriction are, characterized in that the expansion legs at their front end to Formation of a taper pressed together up to the contact of the inner expansion limb surfaces are, and that at the extreme end of the taper on both spreader legs a tooth-shaped one Projection is arranged. 2. Expansion anchor according to claim 1, characterized in that the projections Form a point together on the two spreader legs. 3. Expansion anchor according to claim 1, characterized in that the constriction the inner expansion leg surfaces by embossing the wall of the expansion legs are formed.