SI8811599A - Expansion dowel - Google Patents

Abstract

A spacer dowel is proposed, comprising in spacer sleeve is a pull spacer cone, where according to the invention between the spacer cone and the spacer sleeve spaced plastic sleeve or similar. When unfolding, one part of the sliding sleeve material with fold the spacer sleeve over the conical surface of the spacer cone so that the holes of each other the bearing metal surfaces of the spaced cone and the spacer fills the sleeves with sliding sleeve material. On this one the mode achieves good sliding properties during the spacer sleeve and spacer cone and correspondingly good fit subsequent spillage.

Description

Fischerwerke Artur Fischer GmbH & Co. KG KG

The divisive man

The invention relates to a spacer dowel according to the introductory part of the main patent claim.

DE-OS 34 20 375 discloses a spacer spanner comprising at its stem end a spacer cone that can be pulled into the spacer sleeve. The spacer cone is then pulled into the sleeve so that at the other end of the dowel stem, the bolt is positioned on the object to be fastened by rotating the stem and thereby extending the spacer cone from the bore into which the spacer is located. was inserted. The expansion sleeve remains locally fixed in the borehole and opens with the expansion cone, pushing the expansion sleeve against the borehole wall.

Such spacer dowels are preferably inserted into concrete products. If unfavorable bore extensions now occur, e.g. due to the formation of cracks, there is a requirement for the spacer to open further in order to further fulfill its holding function. The process of additional opening is, however, unfavorably reflected in the hole in the anchored spacer

by squeezing between razpornim cone and disputable tulko. At appropriately high disputable forces easily spaced cone it strikes the strife tulko. The task is an invention to create disputable dowel, at

which will ensure a good slip between the metal spacer cone and the metal spacer sleeve.

The solution of this task is achieved in the spacer dowel of the aforementioned type by the fact that on the spacer cone, in the direction pointing towards the dowel stem, there is an abutment on which a sliding sleeve is arranged with a spacer sleeve in front of the spacer cone; and that the spacer sleeve is pushable over the sliding sleeve to the spacer cone.

The sliding sleeve consists of a material that is transformed upon expansion so that one part of the sliding sleeve material is caught by the spacer sleeve and swings along the cone surface. The holes in the cone surface are hit with sliding sleeve material, and the holes are also slotted through the spacer cone of the gripping inner surface of the spacer sleeve. This results in a considerable increase in the sliding capacity between the spacer and the spacer sleeve, and thus also improves the process of additional spraying accordingly.

In a preferred embodiment, it is contemplated that the sliding sleeve on the abutment protrudes beyond the boundary pressure surface of the spacing cone. Through projecting material, at high pressure spreading, it is distributed along the conical surface of the expansion cone on the basis of the high pressure between the spacer sleeve and the sliding sleeve. Depending on the material of the sliding sleeve and the size of the sliding sleeve, a more or less thin sliding film can be obtained between the spacer cone and the spacer sleeve. Particularly good test results were obtained with a sliding sleeve made of polyamide, which consisted of the slopes of the spaced cone with a corresponding conical circumferential surface.

As a backing on which the sliding sleeve is held in front of the taper cone, the annular surface of the step which restricts the taper cone is preferably used. On this step lies a sliding sleeve with its front surface facing away from the dowel stem.

The spacer sleeve comprises a conical inner surface that can be adjusted to the slope of the spacer cone. Also, the conical inner surface of the spacer sleeve contributes to the desired effect of distributing one part of the sliding sleeve material evenly and thinly across the spacer cone during spraying.

Instead of a plastic sliding sleeve, a soft metal sliding sleeve can also be used, e.g. lead.

Hereinafter, the invention will be described in greater detail with the help of an embodiment shown in the attached plan. The metal spacer shown in the drawing is inserted into bore 1 of wall 2. The spacer consists of a stem 3, a spacer cone 4 connected to the stem 3, a spacer sleeve 5 and a retaining screw 6. There is a gap between the spacer sleeve 6 and the stem 3. a safety element 7 is designed as a spring ring 7, which secures the spacer sleeve 5 in the bore 1 before opening.

Between the spacer cone 4 and the spacer sleeve 5 is arranged a sliding sleeve 8 that rests on the annular surface 9 of the step 10 adjacent to the spacer cone 4. The annular surface 9 serves simultaneously as a support for the sliding sleeve 8. The latter comprises an inner diameter corresponding to the diameter of the section 11 of the stem 12, which grips through the spacer sleeve.

The spacer body with its spacer cone 4 is closely connected to the dowel stem via the stem 12 and the threaded section 13 3- If the fastening screw 6 is now pulled, the dowel stem 3 is moved together with the spacer cone 4 in the direction from the bore. However, since the spacer sleeve 5 with the safety element 7 is locally fixed in the bore, the sliding sleeve 8 and the spacer cone 4 penetrate into the spacer sleeve 5 and extend it until the spacer sleeve 5 with the desired pressure fits into the bore wall.

During expansion, one part in the area of the abutment 10 of the projecting material of the sliding sleeve 8, due to the high pressure, is distributed from the spacer sleeve 5 over the conical surface of the spacer cone 4. In this way, at least the holes of the conical surface are filled, which greatly increases the sliding capacity between the spacer sleeve 5 and not only results in the lower torque being applied to the fastening bolt 6, but also greatly improved.

- 5 an additional expansion procedure at a subsequently expanding bore 1. The safety element 7 must be able to withstand a smaller holding force to prevent the spacer sleeve 5 from slipping from bore 1.

In the embodiment, the sliding sleeve 8 consists of polyamide, while the rest of the spacer dowel is of metal.

Claims (8)

PATENT APPLICATIONS 1. A spacer dowel with a spacer cone that can be pulled into a spacer sleeve arranged at one end of the dowel stem and with the other end of the dowel stem as a screw or similarly designed fastening means, characterized in that it is on a spacer cone (4) a reclining support (9) pointing in the direction of the dowel stem (3), with a recessed sliding sleeve (8) disposed in front of the taper (4) in front of the taper cone (4); and that the spacer sleeve (5) is pushed through the sliding sleeve (8) to the spacer cone (4). Spacer spacer according to claim 1, characterized in that the spacer sleeve (8) on the backrest (9) protrudes over the boundary sheath surface of the spacer cone (4). Spacer spacer according to one of claims 1 or 2, characterized in that the sliding sleeve (8) comprises a conical circumferential surface. Spacer spacer according to claim 3, characterized in that the splines of the spacer cone (4) and the sliding sleeves (8) are approximately the same. Spacer spacer according to one of the preceding claims, characterized in that the backrest is an annular surface (9) of the step (10) adjacent to the spacer cone (4). Spacer spacer according to one of the preceding claims, characterized in that the spacer sleeve (5) comprises a conical inner surface adapted to the slope of the spacer cone (4). 7- Spacer spacer according to one of the preceding claims, characterized in that the sliding sleeve (8) consists of a forming material with sliding properties. Spacer spacer according to claim 7, characterized in that the sliding sleeve (8) consists of polyamide or a suitable plastic. For Fischerwerke Arthur Fischer