DE6930827U - EXPANSION DOWEL - Google Patents

Description

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! 1 : ! Attorney's file lö 737 j j; HILTI AKTIENGESELLSCHAFT in Schaan I '■ (Liechtenstein) «-3 expansion dowels ! ;

The innovation relates to an expansion dowel with an internal thread for use in hard fastening materials, which consists of a partially slotted metal sleeve with a continuous There is a bore and an expansion body that can be driven into the front end piece of the bore, with the front end piece of the dowel jacket radial ribs are arranged.

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Known dowels of the above type have three to four redial ribs on the front end of the dowel jacket, which during the splitting process of the anchor penetrate into the fastening material and create a combined frictional and form fit between the anchor jacket and produce fastening material, whereby the holding force exerted by the expansion body on the dowel wall Radial pressure and the friction between the dowel jacket and fastening material is increased. Since the radial pressure is limited by the yield point of the dowel material, the retaining ribs penetrate hard fastening materials like concrete only slightly in this one. As a result, the known dowels only have three to four radial ribs

j, the holding force is not significantly increased.

The innovation is based on the task of creating a dowel of the type mentioned, which when used in hard materials has significantly higher holding forces.

According to the new song, the problem is solved by the fact that in the whole A large number of small, thread-like radial ribs are arranged on the dowel shell, which in the case of a dowel outer diameter of 20 mm have a pitch of about 0.5 mm.

Due to the fact that a large number of small thread-like radial ribs are arranged in the entire expansion area on the dowel jacket, the points at which a combined frictional and form fit occurs are increased many times over, so that at jj the same radial pressure of the expansion body a significant

the holding force is increased. Due to the division, which is about 0.5 mm with an outer dowel diameter of 20 mm, For example, 20 ribs can be arranged on the dowel jacket over a length of 10 mm, each individual rib with the fastening material · a combined friction and

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Positive locking is received, whereas known dowels have only two to three ribs over the same length, which have a friction and Form fit with the sinal: erial fastening.

The innovation should now be based on the example it reproduces Drawing will be explained in more detail, namely this shows a partial longitudinal section through an expensive according to Dowels.

As can be seen from the figure, the dowel, designated as a whole by 1, consists of a dowel sleeve 2 and one in the Bore 2a inserted cylindrical expansion body 3. The rear end piece of the bore 2a is to receive a fastening screw provided with an internal thread 2b, while the front end piece 2c of the bore 2a is conical tapered .. The front half of the dowel sleeve 2 is provided with slots 4, which when the expansion body 3 facilitate the spreading of the dowel sleeve 2. On the front third of the dowel jacket is a large number of small thread-like Ribs 5 arranged, which penetrate when the dowel sleeve 2 is expanded into the fastening material and through the Form and frictional engagement with the fastening material, the holding or. Increase pull-out force.

Claims (1)

ι * I I Protection claim Expansion anchor with internal thread for use in hard fastening materials, which consists of a partially slotted metal sleeve with through hole and an expandable body that can be driven into the front end of the bore, with the front end of the Dowel ring radial ribs are arranged, characterized in that that in the entire expansion area on the dowel jacket a large number of small, vrird-like radial ribs (5) are arranged, with a dowel outer diameter of 20 mm a pitch of about 0.5 mm exhibit.