UA86303C2 - Dowel - Google Patents

Abstract

The invention relates to building and operation of buildings and constructions. A dowel has screw part 1 and head part 2 arranged as one piece, as one part. The screw section includes conical tip 3 and core 4. Head part 2 is connected to core 4 and has at its free end flange 5. The dowel is arranged with cavity 6 that has entry section 7 with hexagonal cross section. Length of entry section 7 is 2.5-3.5 pf diameter of cylinder of cylindrical section of cavity 6. On facets of entry section 7 of cavity zone of connection to cylindrical section bosses are formed, length of those d does not exceed width l of facet of hexagon of entry section.

Description

part contains a conical tip C and a core 4. The main part 2 is connected to the core 4 and has a flange 5 at its free end, the diameter of which is larger than the diameter of the screw part 1. The dowel is made on a larger part of its length with a cavity 6, open from the side of the main part 2. The western section 7 of the cavity 6 has a hexagonal cross-section, and the other part of the cavity 6 is cylindrical with a round cross-section. The length of the western section 7 is from 2.5 to 3.5 diameters of the cylinder of the cylindrical part of the cavity 6. On the faces of the hexagon of the western section 7, where it adjoins the main cylindrical section, there are protrusions 8 (see Fig. 2, C, 4). The length of the protrusions Pp (see Fig. 3) does not exceed the size I, that is, the width of the face of the hexagon of the western section 7 (see Fig. 4).

Figure 4 shows the contour of the cross-section of the working body of the screwing device with a dashed line. As can be seen, the edges of the working body touch the faces of the western section 7 at points 9, and the edges of the working body touch the protrusions 8 at points 10.

The construction of protrusions 8 can be different, but one condition must be observed: the protrusions must prevent transverse (radial) shifts of the working body of the screw shaft device relative to the dowel. Fig. 5, 6 shows one of these options for the constructive implementation of protrusions in the form of bevels of 11 ribs of the hexagon of the western section.

The purpose of the protrusions considered above is to prevent the dowel from involuntarily falling from the working body of the screwing device. When putting the dowel on the working body, their connection will be formed with a gap, and the gap should be large enough so that the operator does not have any inconvenience at the initial stage of putting the dowel on the working body. At the final stage of putting on, the working body comes into reliable contact with the dowel along the lines corresponding to points 9 and 10 in Fig. 4 or point 12 in Fig. 6, while their connection with tension is formed, which prevents the dowel from falling from the working body . The shorter the length of this connection with tension, the easier the operator's work. This length should be the minimum necessary to prevent the involuntary fall of the dowel from the working body under the influence of its own weight and accidental shock loads on the screwing device. The experience of the authors shows that if the tension is realized, which is overcome when the dowel is put on by the axial force of the operator 2-ZN, this length can be no more than the width of the face of the hexagon of the western section.

The dowel is mounted in the following way.

A sheet attached to a wall or roof is applied and held at the place of its attachment. The operator puts the dowel on the working body of the screwing device, for example, a screwdriver, until tension is formed in their connection. Then, operating only with a screwdriver and not supporting the dowel, he installs the conical tip Z of the dowel at the place of installation of the latter, positions the dowel perpendicular to the surface of the material and turns on the screwing device.

To transmit torque from the working body to the dowel, given its strength, the length of the western section 7, which is from 1 to 1.5 diameters of the cylinder of the cylindrical part of the cavity 6, is quite sufficient.

However, this value of the length of section 7 is not sufficient for a reliable angular orientation of the dowel relative to the working body and, therefore, relative to the surface of the material, for the following reason. Protrusions 8 prevent mutual lateral shifts of the dowel and the working body only at the end of the western section adjacent to the main section; at the opposite end of the western section, there is a gap between the dowel and the working body. As a result, unwanted uncontrolled angular shifts of the axis of the dowel relative to the axis of the screwdriver guided by the operator are possible. However, the longer the western section, the smaller these shifts and, therefore, the higher the accuracy of the angular positioning of the dowel. This accuracy is sufficient when the length of the western section is within 2.5 to 3.5 diameters of the cylinder of the cylindrical part of the cavity 6.

Screwing the dowel into the material of the sheet and, then, into the material of the wall (or roof) is stopped as soon as the flange 5 comes into tight contact with the surface of the sheet being fastened.

Since the screw and main parts are made as one part, there is no need to connect these parts when installing the dowel, which simplifies the installation procedure.

Since during installation, the flange of the main part of the dowel is pressed against the sheet to be attached, not by hitting the dowel with the corresponding pulsed longitudinal displacements of its main part, but by monotonous longitudinal movement of the main part with an easily adjustable speed (the speed of screwing in the dowel), the moment of entry of the flange into tight contact with the surface of the sheet (that is, the moment of stopping screwing) is easily and reliably determined by the operator visually. Thanks to this, the probability of over-compaction of the material of the sheet and the formation of waves on its surface decreases, that is, the quality of installation increases.

The depth of insertion of the working body of the screwing device is limited by the length of the western section 7.

Thus, especially in the case of dowels with a large overall length, the working body does not enter the cavity 6 along its entire length (and, accordingly, does not exit along its entire length after screwing). This significantly reduces the length of the longitudinal stroke of the screwing device, that is, it simplifies the installation procedure.

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