JPS6044688A - Screw protective device for end section of pipe - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a screw time keeping device for a tube end according to the general concept of claim 1).

A substantially tubular body coated with plastic (especially polyurethane), consisting of a plate with two notches or grooves for the application of tools during installation and removal, protecting both the internal and external threads of the tube. Thread protection devices for pipe ends are already known.The plate is cut from the pipe or rolled into a ring from a single plate.The stability of the groove part of the plate is increased by increasing the thickness of the plate. Traditionally, thick plate materials have been used or steel ring anchors have been additionally welded in order to increase the strength of the steel. Ring anchors have to be interrupted at one point in the region of a notch or groove, and for cost reasons these measures are only suitable for large screw protectors.

To improve the bond between the steel plate and the plastic, tongues have been cut from the plate. However, these tongues can only be formed on finished plates, resulting in high costs for additional work.

It is also known to provide a notch in the lower edge of the plate so that the bottom is rounded and cannot be torn from the plastic. However, when this happens, as the plastic hardens, it contracts and the circular sealing seat in the notch area becomes angular.
There was a risk of injury if the seal was not sufficiently sealed.

In the past, plates always had to be coated with anti-rust paint in a special process. Most of the time it's a spray.

Therefore, it is an object of the present invention to create a threaded protection device for pipe ends as described at the beginning, which does not have the disadvantages of the previously known protection devices, in particular has good stability, can be fixed better, and has good bondability with plastics. The goal is to make it better and with less risk of corrosion.

The above object is achieved by the structure described in the characteristic part of claim υ.

The arrangement according to the invention, which provides an uninterrupted edge bend over the entire periphery of the tubular plate, and the recessed groove in the bead, gives the plate extremely great stability and This is especially true at the critical upper edge. This procedure eliminates weak spots and the edges are significantly reinforced against radial forces by the beads. Welding of the steel ring is no longer necessary, even in the case of the largest screw protectors used. The bead itself already anchors the plate very well in the plastic.

Other advantageous and convenient configurations for solving the problem by the invention are described in claims 2) to 8).

Fixing is further improved by the structure described in claim 6). No anchor welding is required. In that case, the holes also have the advantage of favoring the distribution of the plastic during casting.

With the arrangement according to claims 7) and 8) virtually total coverage is achieved. The conventional notch on the lower edge can be omitted. Spacers or clips can be embedded in the plastic. As a result, there is no free part of the board. Corrosion, especially rust, on such parts of the board no longer occurs. The spacer used according to Jin's invention has the additional advantage that, in some cases, lack of rounding, flashing, weld seam bulges, etc. do not have any effect. The circular seal seat provided on the second and third screw protectors no longer has a squarish edge that can be pulled.

By embedding the plate entirely in plastic, additional protective coatings are unnecessary.

The arrangement of the invention allows a continuous casting process without the risk of plastic spillage.

Further explanation will be given based on figures showing examples.

The same components are given the same reference numerals.

The illustrated screw protector consists of a tubular plate 2 with a plastic sheath 4 . Here, the cylindrical plate 2 has a cylindrical jacket 6 and an upper bead 8. The bead 8 is provided with grooves 10 that face each other diametrically.

In the case of the plate body 2 for a male pipe thread protector, the bead 8 is directed inward (Fig. 1.3); in the case of the plate body for a female pipe thread protector, the bead 8 is directed outward. (Second
．． Figure 4).

The cylindrical jacket 6 is provided with a hole 12.

In this example, there are two rows around the perimeter. The number of rows may be one, or two or more rows.

You may also make some holes irregularly.

A spacer 16 is attached to the lower edge 14 of the plate. These spacers are in particular plastic clips. Some of them have animal inserts on the lower edge 14.

The plastic covering 4 is cast using a mold 18 having an outer jacket 20, an inner jacket 22 and a bottom 24 (FIGS. 3 and 4). At the same time, a thread in the plastic of the thread protector is formed in the mold, which complements the pipe thread. There is a female thread 26 (Fig. 3) on the pipe male thread protection equipment.
An external thread 28 (FIG. 4) is cut into the internal pipe thread retainer. The plastic then wraps around the entire plate, entering through the holes 12 and embedding the spacers 16.

By recessing the groove 10 using a suitable tool, a bead 30 (dashed line in FIGS. 1 and 2) is created in the region of this groove. The bead extends beyond the rest of the bead by the depth of the Y groove. In order to provide beads of the same size all around the I-hill, it is reduced in the region of the groove to the width of the remaining bead, ie to the depth of the Y-groove.

This can be achieved by separating the grooves after recessing or by pre-engraving corresponding notches.

[Brief explanation of the drawing]

FIG. 1 shows a tubular plate according to the invention for a male pipe thread protection device, FIG. 2 shows a tubular plate according to the invention for a female pipe thread retention device, and FIG. The figure shows a longitudinal section of the groove area and the attached mold of the male pipe thread protection device, and FIG. 4 shows a longitudinal section of the other area of the female pipe thread protection device and a longitudinal section of the attached mold. It is a front view. In the figure, symbols 2 and 0 plate, 8...bead, 10...groove. L'J + Mj's tj'rtsu (no history in the content) FI
G, 2 FIG, 1 FIG, 3 FIGt Procedural amendment (')i E) July 3, 1939 Director-General of the Patent Office Kazuo Wakasugi 1, Indication of the case Showa 1998 patent application No. ttl-9133Z Invention 13. Person making the amendment Relationship to the case Applicant 4, Agent 5, Power of attorney attached to order for amendment 8. Engraving of specification . (Contents

Claims (1)

[Scope of Claims] 1) A tubular or cylindrical plate formed on the upper edge having at least one groove and on the outer edge when attached.
In the pipe end screw retaining device, the upper edge and the outer edge of the plate (2) are configured to pass through as a bead (8), and the plate (2) is configured to pass through as a bead (8). A screw protection device characterized in that a groove (lO) is formed in the bead. 2) Protective device according to claim 1) for protecting a pipe end internal thread, with the bead (8) pointing outwards. 3) Protective device according to claim 1) for protecting a pipe end external thread, in which the bead (8) is directed inward. 4) Any of claims 1) to 3), wherein the bead (30) is shortened in the region of the groove (10) by the depth of the groove to the width of the remaining bead (8). The protective device described in -. 5) Upper edge of plate (2), outside! (8> has a notch at the position provided for the groove (10) before the edge is bent, and the depth of this notch becomes the groove (10) after the edge is bent.
Grooves (10) that are later formed or pressed in such a way that the width of the bead is the same as the width of the remaining bead (8)
The protection device according to claim 4), wherein the depth of is the same as . 6) The interlocking device according to any one of claims 1) to 5), wherein a hole (12) is formed in the jacket (6) of the plate body (2). 7) Lower edge of plate (2), inner B (
14> has a spacer (16)
) to 6). 8) Spacer in the form of a plastic clip (16)
Protective device according to claim 7, characterized in that it can be inserted onto the lower edge (14).