HRP931331A2 - Expansion dowel - Google Patents

Description

The invention relates to a dissipating brain according to the introductory part of the main patent claim.

From DE-OS 34 20 375, there is known a flared brain, which has a flared cone at the end of its stem, which can be pulled into a flared sleeve. In this case, the gapping cone is inserted into the bushing so that the screw arranged from the other end rests against the object, which has yet to be attached, so that by turning the screw of the stem, the gapping cone is pulled outwards from the screw into which the gapping brain was inserted. At the same time, the bursting sleeve remains fixed locally in the screw, and is opened with the bursting cone, whereby the bursting sleeve is pressed against the wall of the screw.

This kind of breakable brains are preferably inserted into concrete structures. If unpleasant expansions of the screw now appear, for example due to the formation of cracks, there is a request to further expand the torn meniscus in order to continue fulfilling its holding function.

The process of additional flaring is unpleasantly reflected in the screw anchored by the flaring brain with squeezing between the flaring cone and the flaring sleeve. At sufficiently high forces, the rifting cone can be easily ground into the rifting sleeve.

The task of the invention is to realize a tension rod, in which good sliding between the metal tension cone and the metal tension sleeve is guaranteed.

The solution to this task is achieved in the case of a discontinuous brain stem of the type mentioned in the introduction, so that a rest is based on the discontinuous cone in the direction, which points towards the brain stem, on which a reshaping sliding sleeve rests in front of the discontinuous cone arranged, with a discontinuous sleeve; and that it is possible to press the spacer sleeve over the sliding sleeve onto the spacer cone.

The sliding sleeve is made of material, which is reshaped when it is opened, so that part of the material of the sliding sleeve catches with the opening sleeve and creases along the surface of the cone. The holes in the surface of the cone are then filled with the material of the sliding bushing, as well as the holes over the gapping cone of the gripping inner surface of the gapping bushing. This has the effect of increasing the sliding capacity between the expansion cone and the expansion sleeve, and thus correspondingly improving the additional expansion process.

In the front-end design, it is provided that the sliding sleeve on the support protrudes beyond the limit pressure surface of the expansion cone. During ripping, the protruding material is distributed along the conical surface of the rupturing cone during high-pressure ripping between the rupturing surface and the sliding sleeve. Depending on the used material of the sliding sleeve and the size of the sliding sleeve, a more or less thin sliding film can be achieved between the expansion cone and the expansion sleeve. Particularly good experimental results were achieved with a sliding sleeve made of polyamide, which included a suitable conical peripheral surface of the slope of the flared cone. As a support, on which the sliding sleeve is held in front of the spreading cone, the annular surface of the step, which limits the spreading cone, serves as a support.

On that step lies the sliding capsule with its frontal surface facing away from the brain stem.

The diaphragm sleeve includes a conical inner surface, which is easily adjusted to the angle of the diaphragm cone. Also, the conical inner surface of the expansion sleeve achieves the desired effect, that a part of the material of the expansion sleeve is uniformly and thinly distributed throughout the expansion cone during expansion.

Instead of a sliding sleeve made of synthetic material, a sliding sleeve made of soft metal, eg lead, can be used.

In the following, we will present the invention in more detail with the help of an implementation example, presented in the attached drawing.

In the drawing, the Kovisnik ramrod is inserted into the screw 1 of rock 2. The ramrod consists of a stem 3, a ramrod cone 4, which is connected to the stem 3, a ramrod sleeve 5 and a fastening screw 6. Between the ramrod sleeve 6 and the ramrod stem 3 is is used as a spring ring 7, a safety element based on which the collapsible sleeve 5 is fixed in the screw 1 before collapsing.

Between the expansion cone 4 and the expansion sleeve 5, a sliding sleeve 8 is arranged, which rests on the annular surface 9 of the step 10, which borders on the expansion cone 4. The annular surface 9 also serves as a support for the sliding sleeve 8. It includes an inner diameter, which corresponds diameter of the section 11 of the stem 12, which grips through the gaping sleeve.

The spacer body with its spacer cone 4 is closely connected to the stem 3 via the stem 12 and the threaded section 13. If the fastening screw 6 is now tightened, the spacer stem 3 together with the spacer cone 4 moves out of the screw. The burst sleeve 5 with the safety element 7 is locally fixed in the screw, the falling sliding sleeve 8 and the burst cone 4 in the burst sleeve 5, and they expand it, until the burst sleeve 5 with the desired pressure abuts on the wall of the screw.

During expansion, one part in the area of the support 10 of the protruding material of the sliding sleeve 8 is distributed due to high pressure from the expansion sleeve 5 over the conical surface of the expansion cone 4. At the same time, the smallest holes of the conical surface are filled, which significantly increases the sliding ability between the expansion sleeve 5 and the expansion pin 4. This does not only result in a smaller torque being used on the fastening screw 6 when unzipping, but the additional unzipping process is significantly improved during the subsequent expansion in screw 1. The spring ring 7 as a safety element must transmit less holding force, so that would prevent sliding of the spacer sleeve 5 from the screw 1.

In the exemplary embodiment, the sliding sleeve 8 is made of polyamide, while the other parts of the tensioning rod are made of metal.

Claims (8)

1. A poppet cone with a poppet cone, which can be pulled into a poppet sleeve, which is arranged at one end of the poppet stem, and from the other end of the poppet stem as a screw or a similar-based fastening means, indicated by the fact that on the poppet cone (4) based rest (9), which looks in the direction of the brain stem (3), where the rest (9) rests in front of the expansion cone (4) arranged with the expansion sleeve (5) and a reshaping sliding sleeve (8); and that the expansion sleeve (5) can be pushed over the sliding sleeve (8) onto the expansion cone (4). 2. A diaphragm valve according to claim 1, characterized in that the diaphragm sleeve (8) on the support (9) protrudes over the boundary surface of the diaphragm of the diaphragm cone (4). 3. Diaphragm valve according to one of claims 1 or 2, characterized in that the sliding sleeve (8) includes a conical peripheral surface. 4. A diaphragm valve according to claim 3, characterized in that the slopes of the diaphragm cone (4) and the sliding sleeve (8) are approximately equal. 5. A gaping brain according to one of the previous claims, characterized in that the support is the annular surface (9) of the step (10), which borders the gaping cone (4). 6. A diaphragm valve according to one of the preceding claims, characterized in that the diaphragm sleeve (5) comprises a conical inner surface, which is adapted to the slope of the diaphragm cone (4). 7. A gaping brain according to one of the previous claims, characterized in that the sliding sleeve 8 consists of a deformable material with sliding properties. 8. A gaping brain according to claim 7, characterized in that the sliding sleeve (8) consists of polyamide or a suitable synthetic material.