SU1664120A3 - Dowel - Google Patents

Abstract

The invention relates to mechanical engineering, in particular to fasteners. The purpose of the invention is to increase the reliability of fastening. The dowel contains an expanding sleeve 1, a spacer body 3 and a counter support 5. The screw 2 has a spring ring 11. The diameter of the ring 11 is larger than the diameter of the hole 15. Densely pressing the ring 11 against the walls of the hole 15 creates additional support and improves the expansion of the dowel. 1 з.п f-ly, 3 ill.

Description

The invention relates to mechanical engineering, in particular to fasteners.

The purpose of the invention is to increase the reliability of fastening.

FIG. 1 shows a dowel with a spring ring placed between the intermediate and plastic sleeves; Fig. 2 shows the same, with a spring ring placed between the expanding sleeve and the plastic sleeve; fig. 3 - the same, with a spring ring placed between the expanding sleeve and the annular support surface of the counter support.

The dowel contains an expanding sleeve 1 with slots forming petals on the inlet section, a screw 2 installed in the sleeve 1 and connected to the spacer body 3. The expansion body 3 is placed in the sleeve with the possibility of axial movement and contact with the inner surface of the sleeve. The spacer body 3 can be made in one piece with the screw 2 (FIG. 3) or screwed onto it along the thread 4 (FIGS. 1 and 2). The screw 2 is connected to the counter support, which can be made as screw-shaped

step 5 or in the form of a threaded rod element 6 with a threaded socket 7 for a screw 2 on the side of the annular support surface 8.

On the screw 2 between the plastic 9 and intermediate 10 sleeves, a support element is installed in the form of a spring ring 11, the outer diameter of which exceeds the diameter of the expanding sleeve 1. The ring 11 can be mounted on the screw 2 between the plastic sleeve 9 and the expanding sleeve 1 (FIG. 2) or between the expanding sleeve 1 and the annular support surface 8 of the counter support with the possibility of radial compression of the expanding sleeve.

The plastic sleeve is made with longitudinal ribs 12, and the uncoupling sleeve in the contact zone with a spring ring has an annular protrusion 13 whose surface has the shape corresponding to the cross section of the ring 11 The expanding sleeve in contact with the spring ring through the plastic sleeve is made in the contact zone with the sleeve with an upset plot 14, placed inside of the p 9

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It is advisable to take the diameter of the spring ring 11 by 1–1.5 mm larger than the diameter of the drilled hole 15. For a hole diameter of about 12 mm, it is recommended to increase the diameter of the ring 11 by about 1 mm and for a larger hole diameter to 1.5 mm.

When the upset section 14 is made elongated (FIG. 2), the spring ring 11 is installed on this section. Such a ring requires a smaller wire diameter, so it can be made of wire with a rectangular cross section.

The dowel works as follows.

To fasten the object 16, the dowel is installed in a previously prepared drilled hole in the anchor base. When installing the dowel, the spring ring 11 is compressed to the diameter of the bore hole corresponding to at least the outer diameter of the expanding sleeve 1, which does not require additional efforts for driving. After the dowel is installed, the spring ring 11 is pressed tightly against the wall of the hole. By applying a torque to the head 17 through the washer 18, the spacer body 3 is drawn into the expanding sleeve 1. At the same time, the petals of the sleeve emerge radially into the wall of the hole 15. The pressure sleeve itself indirectly or directly rests on the spring ring, as it is tightly clamped relative to the wall of the bore hole,

If, after fixing due to the formation of cracks, the hole expands, the spring ring 11 prevents the expansion sleeve 1 from moving. This forcefully tightens

the spacer body 3 into the expansion sleeve and, as a result, additional expansion of the sleeve 1 and alignment of the expansion of the hole.

The annular protrusion 13 centers the spring ring 11 and acts on it due to its shape so that the spring ring supports the expansion of the sleeve.

The application of the invention allows

increase the reliability of fastening by creating additional expansion of the sleeve.

Claims (2)

1. Dowel containing expandable a sleeve disposed therein with the possibility of axial movement and contact with the inner surface of the sleeve; an expansion body associated with the screw; element in the form of a spring ring, the outer diameter of which exceeds the diameter of the expanding sleeve, the support element is placed on the screw between the annular support surface of the counter support and the expanding sleeve with the possibility of radial compression of the latter, and the expanding sleeve in the contact zone with the support element is made with an annular protrusion whose surface has a shape that corresponds to the cross section of the support element. 2. The dowel according to claim 1, of which is that the counter support is made in the form of a threaded rod element with a threaded socket for a screw on the side of the annular support surface or in the form of a ledge molded to the screw.