RU157962U1 - Tapping - Google Patents

Abstract

1. A self-tapping screw containing a threaded rod with a pointed end, a main head adjacent to the threaded rod, characterized in that it further comprises a hexagonal tear-off head connected to the main head by a communication element, which is made in the form of a rod of small cross section. A self-tapping screw according to claim 1, characterized in that the pointed end of the threaded rod is made in the form of a drill tip. 3. A self-tapping screw according to claim 1, characterized in that the height of the hexagonal tear-off head is 4.15 - 5.40 mm, depending on the diameter of the thread.

Description

The proposed utility model relates to threaded fasteners, namely, self-tapping screws that prevent them from unauthorized unscrewing, the design of a self-tapping screw, which can be used in construction and in everyday life for the manufacture of non-separable structures. It can be screwed into wood, metal and other similar products without first having to drill them.

Known rivet for one-sided riveting, comprising a body in the form of a tubular rod, made with a mortgage head on one side and inserted into the body of the rod with an enlarged spherical back on the other side. To install the rivet, a hole is drilled in the fastened elements slightly larger than the outer diameter of the rivet body. The riveting is inserted into the hole until the stop of the embedded head, with the help of a riveting device, the core located inside the housing is extended and the rear part goes inside the tube, increasing its diameter and pressing the parts to be joined together, and when a certain force is reached, the core breaks leaving a spherical part inside the tube.

The disadvantage of rivets is the very high complexity of the process, the ease of dismantling the rivet.

A known design of a bolt with a tear-off head (DE 3150434 A1, CL F16B 41/00, F16B 1/02, F16B 5/02, E04F 13/08, E06B 9/01, publ. 30.06.83), which consists of a threaded rod and the main head adjacent to it, the communication element connecting the heads to each other, the communication element is made in the form of a rod of small cross section, when the bolt is tightened to a certain torque, the communication element is destroyed and the tear head is separated from the main bolt head, after which the bolt cannot to be dismantled due to the absence on the surface of the main head m Article engagement with a mounting tool.

A countersunk screw is known, comprising a cylindrical threaded rod mated to a main conical head, a hexagonal drive head connected to the flat part of the main head by a refined connecting element (FR 2695440 A1, class F16B 41/00, F16B 31/02, F16B 23 / 00, published on March 11, 1994). The screw is designed to screw into a threaded hole during assembly. After the main conical head abuts against the recess, the torque extends to the connecting element, causing it to break. After removing the hex head, the screw can no longer be removed using conventional means. Another advantage of the screw is the intensity of the clamp, which can be achieved using a hollow key received by the hex head, much higher intensity than the clamp obtained with a simple screwdriver.

The disadvantage of these fasteners is their narrow specialized application, the need for preliminary drilling of holes, which complicates their installation.

The closest in technical essence and the achieved result to the proposed utility model is a self-tapping screw, widely used in construction and everyday life, taken as the closest analogue (prototype).

The prototype self-tapping screw contains a threaded rod with a pointed end, or with a drill tip and with a socket head.

The advantages and general characteristics of the self-tapping screw according to the prototype is the speed and ease of installation.

However, at the same time, the self-tapping screw described as a prototype cannot be used for the manufacture of non-separable structures, which are required to be difficult to dismantle.

The task of the utility model is the improvement of the design of the self-tapping screw.

The technical result of using the utility model is to prevent unauthorized dismantling.

The problem is achieved in that the tapping screw with a threaded rod with a pointed end, the main head adjacent to the threaded rod, further comprises a hexagonal tear-off head connected to the main head by a communication element, which is made in the form of a rod of small cross section; the pointed end of the threaded rod is made in the form of a tip-drill; the height of the hexagonal tear-off head is 4.15 mm - 5.40 mm.

In FIG. 1 is a drawing of a self-tapping screw.

Structurally, the self-tapping screw in FIG. 1 contains:

1 - threaded rod;

2 - pointed end;

3 - the main head;

4 - hexagonal tear-off head;

5 - communication element.

The threaded rod 1 is made with a pointed end 2.

The main head 3 is adjacent to the threaded rod 1.

The tear-off head 4 is made hexagonal and connected to the main head 3 by a coupling element 5, which is made in the form of a rod of small cross section.

The pointed end 2 of the threaded rod 1 can be made in the form of a tip-drill.

The height of the hexagonal tear-off head 4 is 4.15 mm - 5.4 mm. The indicated height of the hexagonal tear-off head 4 is optimal for engagement with any gripping tool. It is not practical to make the height of the hexagonal tear-off head 4 less than 4.15 mm, since there will be no normal engagement with the gripping tool. To perform the height of the hexagonal tear-off head 4 more than 5.4 mm is impractical due to overuse of material.

The manufacture of the proposed self-tapping screw is as follows. In the line for the production of self-tapping screws, after the formation of the hexagonal head 4, a knitting machine 5 is mounted for knurling, which separates the head 4 into the main main head 3 and the hexagonal tear-off head 4. The coupling element 5 is made in the form of a rod of small cross section so that the remaining height of the faces tear-off head 4 was 4.15 mm - 5.40 mm depending on the diameter of the thread. Then install the equipment for rolling threads on the threaded rod 1 with a pointed end 2, or set the stamp to form the tip-drill. Then the product is sent for hardening and applying a corrosion-resistant coating.

The proposed utility model works as follows.

For example, on a frame assembled from a metal profile pipe using the proposed self-tapping screw with a drill tip combined with a press washer and EPDM rubber gasket, a profiled sheet is attached. Upon reaching the effort of pressing the sheet to the frame of 15-18 nm, the communication element 5 is destroyed and the tear-off head 4 is separated from the main head 3 of the self-tapping screw. Due to the absence on the surface of the main head of 3 places for engagement with the mounting tool, and also due to the protrusion remaining on the surface of the main head 3 of the protrusion that impedes its drilling, the self-tapping screw cannot be dismantled.

The implementation of the detachable head 4 of a hexagonal shape allows you to tighten the screw using a bit on the hex head, wrench or any exciting tool.

The proposed self-tapping screw can be used, for example, in the device of fencing when assembling a metal frame and subsequent fastening of metal sheets, or a wooden or metal picket.

The proposed self-tapping screw can be used, for example, in the assembly and subsequent sheathing of frame structures.

Claims (3)

1. A self-tapping screw containing a threaded rod with a pointed end, a main head adjacent to the threaded rod, characterized in that it further comprises a hexagonal tear-off head connected to the main head by a communication element, which is made in the form of a rod of small cross section. 2. The screw according to claim 1, characterized in that the pointed end of the threaded rod is made in the form of a drill tip. 3. The self-tapping screw according to claim 1, characterized in that the height of the hexagonal tear-off head is 4.15 - 5.40 mm, depending on the diameter of the thread.

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