DE1625406A1 - Wall dowel - Google Patents

Description

LA Mortensen
Kongevejen 35 »Birkerad.

Wall anchors.

The invention relates to a wall plug, which is made of elastic or plastically resilient material, especially polyvinyl chloride, and is intended to be placed in a hole and to enclose a fastening element, especially a screw. The wall plug usually has outer and inner grooves so that it is compressed and expanded can be. Usually a hole is drilled with a diameter smaller than the outer diameter of the wall plug so that the wall plug is compressed a little when it is inserted into the hole. It usually becomes a screw with a coarse tapered thread, a so-called wood screw or a French screw, used, which gradually expands the wall dowel as it is screwed in, compressing its material against the perforated wall is and penetrates into it in Yertiefungen, whereby an effective retention of the wall anchor and thus the screw is achieved.

Since the screw is made of stronger material than the wall plug, So far, relatively hard and therefore strong material has been used for the wall anchors, so that their strength should mostly correspond to the strength of the screws, so that maximum strength should be achieved through this, and it has also achieved very good results.

It has now been found, surprisingly, after the invention that even better results are achieved can if softer material is used for the wall anchors will. According to the invention, the wall anchor can at least partially consist of a material that at room temperature (20 ° G) a hardness of 59 to 69 3hore hardness D2 (ASTM

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D 676-58 T and D 1484-57 T 'forms, with a load of 5 kg), preferably approximately 64 shore hardness D2. It has surprisingly it turned out that with wall anchors from such material, especially polyvinyl chloride, pull-out tests in concrete give the result that the Screw is torn. When pulling out in weak building materials, e.g. * with a tensile strength of 30-50 kg per

cm ", results will be achieved that are surprising are better than expected considering the strength of the building material.

According to the invention, the material of the wall plug can advantageously have a hardness of 33 to 43 shore hardness at 50 ° C D2, and mainly again when cooling down to room temperature assume the hardness given above of 59 to 69 shore hardness D2. When taking advantage of this especially low hardness at elevated temperature will be particularly good Results achieved.

According to the invention, the wall plug can be of the type which has longitudinal depressions or grooves. With such Wall anchors have achieved particularly good results.

In the drawing, a wall plug according to the invention is shown, in cross-section

The wall plug has an approximately circular outer circumference and an approximately cylindrical hole from which radial recesses or grooves extend outward. In the roughly cylindrical outer surface are proportionate Shallow recesses or grooves formed, creating three massive longitudinal blocks 1 and thin accordion-like connecting parts 2 are formed.

The wall plug can advantageously be produced by extrusion so that it has the same cross-section over its entire length » It consists of polyvinyl chloride with a hardness of approximately 64 shore hardness D2.

When using the wall plug, a wall plug is used Hole-drilled, the diameter of which is smaller than the outside diameter of the wall anchor. The wall plug is inserted into the hole, which compresses it a little,

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by bending the parts 2. After that, a screw with a large tapered thread, a so-called wood screw or a French screw, is screwed in. This will engage with the inside of the massive longitudinal blocks 1 and push them out one after the other, so that they are pressed against the wall of the hole, "If the screw is the right size, the material will be vigorously compressed so that the hole is completely filled, and the material will penetrate into depressions in the wall of the hole, whereby" more forcefully Resistance to pulling out the wall anchor is achieved. Furthermore, a strong compression of the wall dowel material around the screw is achieved, so that there is strong resistance to the screw being pulled out. If the wall plug material has a greatly reduced hardness at elevated temperature, for example approximately 38 shore hardness D2 at 50 ^'0 C "- ,. this can be exploited to cause a particularly good penetration into the hole wall, so that a particularly large resistance to Pulling out of the hole is achieved. When the wall plug is cooled down later, the material regains its original hardness and thus strength.

Alternatively, the wall plug can be manufactured by injection molding be carried out with a varying cross-section can be. He can e.g. - at one end one Have a collar or other extension. His inner

The knife can eventually go from one end to the other - decrease, e.g. according to: the conicity of the screw. The Hauer dowel can be injection molded especially for use be? lm Etngiescen be formed in concrete, in which case he can be trained with external Yor jumps.

The old wall anchor can be made from material with different hardnesses exist. For example, it can be advantageous that the inner parts of the luauer dowel are made of a relatively hard material consist, while the outer parts are proportionately made of soft material. This can be a particularly good one "Pressing the material into ... deepenings in the wall of the hole can be reached, and at the same time" the inner parts have a - 0 0 982 1/0 1 7 0

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great strength and thus great resistance to the screw being pulled out. Such a wall plug made of material with different hardnesses can be produced relatively easily by extrusion. A wall plug can also be made by injection molding. Manufacture material with different hardness in different parts of the anchor.

The wall plug can have other cross-sections than those shown to have.

The wall anchor described has proven to be very advantageous in Walls made of hard, strong materials have been proven, e.g. concrete, with such good results with regard to the pull-out strength that the screw is torn without the wall plug becomes loose. For walls made of weaker material, e.g. with a compressive strength of 30-35 kg per cm, e.g. so-called Leca-Beton (trade name) or aerated concrete Results have been achieved that are better than expected with regard to the strength of the wall material. With Consideration of the definition of hardness can be pointed out to the following. B .P. "uses ASTM D 1706-61 and Solvic. ASTIVI D 676-58 T and ASTM D 1484-57 T-. With regard to the hardness tester used, DIN 53505 and ASSI,! D 6 "7c pointed out,., see, by the way, the enclosed copy of a Brochure, from Solvic. . '

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Claims (3)

Claims. 1. Wall anchors made of elastic, or 'plastisol! Resilient material, in particular polyvinyl chloride, and is designed to be arranged in a hole in the eye and to enclose a fastening element, especially a screw, so that it can be at least partially made consists of a material which at room temperature (2O ⁰ Q) has a hardness of 59 to 6 "9 shore hardness D2 (ASEM D 676-58 T tmd D 1484-57 T standards, with a load of 5 kg), -previously, approximately, 64 shore hardness D 2. \. 2. Wall dowel according to claim 1, since you rchge Ic e η η ζ eich η et that the material at 50 ⁰ O has a hardness of 33 to 43 shore hardness D2, and that it cools to S; tubeni; emperatur again mainly assumes the hardness specified in claim 1. ^ _; 3. Wall dowel according to claim 1 or 2, d a d u- "r, c h g e - *. ' indicate that he is of the kind has longitudinally directed recesses or grooves. . 00982 1/01 70 ■■ "^ DORIGINAL Empty soap