RO123196B1 - Protective cap for the ends of smooth pipes - Google Patents

Abstract

The invention relates to a protective cap for the ends of smooth pipes, meant to protect the end of metal or plastic pipes during manipulation, transport and storage. According to the invention, the cap has an annular disc (a) continued outwards with a tapered annular zone (b) and inwards with a cross sealing wall, the lobes (e) of the fastening wings (3 and 4) having the angular opening of the circular arc ( alpha ) = 120...180°. The exterior points (f) of the wings are arranged on a circle having a diameter smaller than or equal to an external diameter (g) of the tapered annular zone (b), and the ratio between the external diameter (g) of the tapered annular zone (b) and the height (h) of the protective cap is g : h > 2.

Description

The invention relates to a protective cover, for the ends of the smooth pipes, made of thermoplastic mass and intended to protect the end of the pipes of metal or plastic table, during handling, transport and storage.

There are known protective plugs made of thermoplastic mass, formed from an end annular disc, with the outer diameter equal to or slightly larger than the outer diameter of the pipe, followed by a central tube of small diameter, on which a number of fins are arranged. fastening formed of lobes, the lobes having a semicircular shape, with the area adjacent to the central ring tube. The lobes of the fins have the form of semicircles of much smaller thickness than of the end disk and with the diameter comparable with the inner diameter of the pipe, supporting slight deformations when fixing the stopper on the end of the pipe. Each lobe has an extreme point at an angle of a = 3607 the number of lobes, compared to the extreme points of the next wing, being offset by an angle a / 2 (RO request 2006 00275).

These protective plugs have the disadvantage that they do not allow their mounting on pipes of large diameters and with different thicknesses of the wall, to the same outer diameter, so that for each thickness of pipe wall, only one type of protective plug is required, with the diameter of the fins. with the inside diameter of the pipe, otherwise, the wings undergo random deformations, which lead to an inclined placement of the disc at the end of the pipe, there being the risk of uncontrolled exit, leaving the end of the pipe unprotected.

Also known is a protective plug (RO 123023), consisting of an end disc, followed by a central tube with fins that have the shape of circular circles, with 360 ° angular opening, between each two fins, located in the same plane, being provided with a radial groove, which extends from the circumference of the wing to the central tube.

The technical problem, which the invention solves, is to achieve a geometrical configuration that allows an elastic deformation greater than the elastic deformation itself of the thermoplastic material used, so that the same cap can be used for pipes with large diameters and with a range large wall thickness, at the same outer diameter, also ensuring protection of the pipe end chamfer.

The protective cap, for the ends of the smooth pipes, according to the invention, solves this technical problem and eliminates the disadvantages above, in that, in the transverse plane, the annular disk is continued outwards with a truncated annular area and inwards with a transverse sealing wall. , and the lobes of the fixing fins have the angular opening of the circle arc a = 120 ... 180 ° and their extreme points are arranged on a circle with a diameter smaller or equal to the outer diameter of the truncated annular zone, and the diameter of the truncated annular zone opposite the height of the protective cap is in the ratio of g / h> 2.

The transverse sealing wall is a continuation inwardly of the annular disk or is placed towards the inner end of the central tube, leaving the access chamber open from the outside.

The fins are circular and have smaller diameters, progressively, than the diameter of the truncated annular zone, in a relation k <j <g, and the last fin with the diameter not smaller than the inner diameter of the pipe to be protected.

By applying the invention, the following advantages are obtained:

- lowering costs, by reducing the number of types of dimensions of the protective plug, for the same outer diameter of the pipe;

- the plugs can be reused, due to their deformation only in the elastic field;

- ensures high quality of the injected parts and increased productivity.

The following is an example of embodiment of the invention, in several embodiments, in connection with FIG. 1 ... 16, which represents:

FIG. 1, side view of the protective cover;

RO 123196 Β1

FIG. 2, axial section through the protective cover, according to a plane I-I, of FIG. 3; 1

FIG. 3, axial view of the protective cover, from the direction II, from fig. 1;

FIG. 4 is an axonometric view of the protective cover of FIG. 1 ... 3, in the closed version 3 and with the lobes of the wings in the same direction;

FIG. 5, axonometric view of the protective cover, in the open version and with the lobes 5 of the wings in the same direction;

FIG. 6, side view of the protective cover, in open version and with lobes 7 of the wings shifted by half step;

FIG. 7, axial view of the protective cover, from the direction III, from fig. 6; 9

FIG. 8, axial section through the protective cover, according to a plane IV-IV, of fig. 7;

FIG. 9 is an axonometric view of the protective cover of FIG. 6. .8, in the open version 11 and with the lobes of the wings shifted by half a step;

FIG. 10, axonometric view of the protective cover, in the closed version and with lobes 13 of the wings shifted by half step;

FIG. 11, side view of the protective cover, in the open version and with continuous circular fins 15;

FIG. 12, axial section through the protective cover, according to the plane V-V, of fig. 13; 17

FIG. 13, axial view of the protective cover, from the VI direction, from fig. 11;

FIG. 14, axonometric view of the protective cover, of fig. 11 ... 13, in the open version 19;

FIG. 15, axonometric view of the protective cover, with continuous circular fins, 21 in the closed version;

FIG. 16, axial section through the protective cover, according to plane VII-VII, of fig. 15. 23

The protective cover, for the ends of the smooth pipes, according to the invention, is composed of an end zone 1, with a profile comprising a ring disk of a transverse plane, continued 25 outwards with a truncated annular zone b, which protects both the end of the pipe in transverse plane, as well as the chamfer portion of the pipe end, the truncated profile giving it 27 the stability of the shape over time.

End zone 1 is continued with a central tube 2, along which 29 fins 3 and 4 are arranged, in number of two or more, as the case may be, and of a thickness smaller than the thickness of end zone 1. 31

The fins 3 and 4 have an annular zone c, adjacent to the central tube 2, continued outwards with a lobed annular zone d, composed of some lobes e, in a certain number and greater than 33, depending on the diameter range a. pipes to protect.

The lobes e have the shape of a circle arc with an angular aperture a = 120 ... 180 °, and their extreme points 35 f are arranged on a circle with a diameter smaller or equal to the outer diameter g of the annular area b. 37 in the lobed configuration of the wings 3 and 4, the flexibility of each lobe e increases from the center to the extreme point f, giving the possibility of deforming the lobes more than the elastic deflection given by the thermoplastic material used, so that the same protective cover adapts and can be fixed on the ends of the pipes with the same outer diameter, but with various thicknesses of 41 the wall of the pipe, in a very wide range.

In another embodiment, the lobes e have a variable thickness from a greater value 43 from the base of the lobes to a smaller thickness to the extreme point f, thus further increasing the flexibility of the fin and, at the same time, the adaptability of the lid to a larger range of 45 pipes wall thickness to protect.

In some constructive variants, the arrangement of the lobes e on the wing 3 is in the same axial direction as the lobes e on the wing 4, as in fig. 4 and 5, or in other constructive variants, the lobes e of the wing 3 being offset angularly, compared to the lobes e of the fin 4, with a half angular step β, as in fig. 7, 9 and 10.

The protective cover, for the ends of the smooth pipes, according to the invention, used for pipes of large diameter, has a ratio between the diameter g of the truncated ring zone b and the height h of the protective cover of g / h> 2.

To seal the pipe end against the entry of foreign bodies or water, the protective cover is provided with a transverse wall 5, which in some constructive variants is in continuation inwardly of the annular disc a, as in the variants in fig. 2, 4, 10,15,16, and in other constructive variants, it is placed towards the inner end of the central tube 2, leaving an enclosure open from the outside, as in the variants in fig. 5,8,9,12,14, in which situation the pipe end can be easier to grip, as well as easier manual fixing of the protective cap on the pipe end.

In another embodiment, without lobes, the fins 6 and 7 are circular and have smaller diameters, progressively, than the diameter g of the truncated annular zone b, so the diameter i of the fin 6 is j <g, and the diameter k of the fin 7 is k <j <g, but not smaller than the inner diameter of the pipe to be protected.

Claims (3)

1. Protective cover, for the ends of the smooth pipes, composed of a protection zone 3 of the pipe end in the form of an annular disc (a) and of a central tube (2) along which are fixed fixing fins , formed by some lobes (s) in the form of a circle arc, 5 characterized in that, in a transverse plane, the annular disk (a) is continued outwards with a truncated ring area (b) and inwards with a transverse wall ( 5) sealing, and 7 lobes (s) of the fixing wings (3 and 4) have the angular opening of the circle arc a = 120 ... 180 ° and their extreme points (f) are arranged on a circle of smaller diameter or equal to 9 with the outer diameter (g) of the truncated annular zone (b), and the diameter (g) of the truncated annular zone (b) with respect to the height (h) of the protective cap is in relation to g / h> 2. 11 Protective cover for the ends of the smooth pipes according to claim 1, characterized in that the transverse sealing wall (5) is a continuation towards the inside 13 of the annular disk (a) or is placed towards the inner end of the central tube (2), leaving the access enclosure (s) open from the outside. 15 Protective cover, for the ends of the smooth pipes, according to claim 1, characterized in that the fins (6 and 7) are circular and have diameters (j and k) smaller, 17 progressively, than the diameter (g) of the truncated annular area. (b), in a relation k <j <g, and the last fin (4) with the diameter (g) is not smaller than the inner diameter of the pipe to be protected. 19