JPH024062Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial field of application> The present invention is a device for protecting the end face of pipes such as steel pipes, that is, a tool that is attached to the end face of the pipe to prevent the end face from being damaged during transportation. This relates to a pipe end face protector for

<Prior Art> Various types of pipe end face protectors of this type have been proposed in the past, one example of which is the one shown in Japanese Utility Model Application No. 61-35169 filed by the present applicant. be. This device has one end of a cylindrical body formed as a flange, a guide member is pushed outward by a cotter plate, the extensible part of the cylindrical body is spread out by the pressure, and the flange is crimped onto the inside of the target tube. The end surface of the pipe is covered at the end of the pipe.

Another example is shown in Japanese Utility Model Publication No. 49-38901, which expands by driving a sawtooth-shaped tapered wedge between the locking parts attached to the notches of the annular member. It is used to measure diameter.

<Problems to be solved by the invention> In the pipe end face protector described in the above-mentioned Japanese Utility Model Application Publication No. 61-35169, the connector plate is tightened with bolts, etc.
When pushing between guide members, a tightening force is applied to the sliding parts of the base of the guide members on both sides, which may impede the outward movement of the guide members, and also prevent the bolt from moving forward and backward. There are problems such as the position being shifted from the center position between the guide members.

In addition, in the protective device described in the above-mentioned Japanese Utility Model Publication No. 49-38901, when expanding the diameter of the cylindrical body by driving a serrated and tapered wedge between the locking parts, it is removed from the pipe opening after the diameter has been expanded. In some cases, there is a problem in that it takes a lot of effort to remove the wedge.

The present invention aims to solve the above-mentioned problems and provide a tube end face protector that is highly efficient and easy to operate.

<Means for solving the problems> The above object of the present invention can be achieved by the following means. That is, the gist is that one end of a cylindrical body with open ends is bent outward to form a flange, a slit is provided across the flange to the other end of the cylindrical body, and the slit is formed at the slit. Both ends are overlapped over a required length to form a telescopic section, and a fall prevention section is formed on one of the oblique sides on both sides as a boundary at the tip of the inner peripheral wall of the telescopic section, and a plate-shaped connection is formed on the other side. The triangular locking portions are bent at approximately right angles, and the tops of the locking portions are fixed so that they face each other, and one side of the triangular space formed between the locking portions is fixed. , an opening groove is formed from the top to the bottom, a protective portion is integrally formed to cover the opening groove, and a protruding portion in which a bolt insertion hole is formed at the base end; Along both diagonal lines, a connecting portion having a long hole for connecting is fitted with a wedge portion having a shape similar to the above-mentioned space that stands upright at a substantially right angle, and a connecting rod is loosely inserted into the long hole for connecting. The bolt is inserted in a through-shape, and its tip is fixed to the connecting part of the locking part, and the other part of the space can be freely inserted into the opening groove and the protective part, and is opposite to the bolt insertion hole. The protruding part in which the bolt threading hole is formed is inserted into the wedge part which stands upright at a substantially right angle, and the bolt-shaped fastening fitting is screwed into the bolt threading hole through the bolt insertion hole. This is a pipe end face protector with special features.

<Embodiments and operations> The pipe end face protector of the present invention will be described in detail below with reference to drawings showing embodiments thereof.

Figures 1 to 4 show the main parts of the tube end face protector of the present invention. As shown in Figure 1, a flange 2 is attached to one end of a short cylindrical body 1 with open ends. This cylindrical body 1 is cut in the longitudinal direction at a certain point, and a required length is overlapped at the cut part to form an expandable part 3. Triangular locking portions are provided on the left and right inner wall surfaces of the inner peripheral wall of such a cylindrical body 1, with the tip of the inner inner peripheral wall 4 of the expandable portion 3 as the boundary, and on both sides thereof, with the tops facing each other. Fix 5, 5',
A connecting portion 6, 6' is provided on one diagonal line side of the locking portions 5, 5', and is formed vertically at a substantially right angle from the diagonal line side.
Further, on the other diagonal sides, slip-off prevention portions 7, 7' shaped more than the oblique sides are formed.

Next, FIG. 2 shows a wedge portion 10 which is bent so that an opening groove 8 is formed from the top to the bottom of a triangular shape, and a protective portion 9 is formed to cover the opening groove 8. , connecting portions 6-1 and 6-1' are provided on both oblique sides of the wedge portion 10, and are bent at approximately right angles along the oblique sides, and the connecting portions 6-1, 6-1'
Elongated connecting holes 11, 11' are formed along both oblique sides of the wedge portion 10 on the side surfaces 1, 6-1'. Further, the proximal end of the protective portion 9 is provided with a projecting portion 13 in which a bolt insertion hole 12 is formed, and the distal end of the protective portion 9 is provided with a protruding portion 13 for receiving a bolt to be inserted into the protective portion 9. It is formed so as to protrude from the top of the wedge portion 10 in order to provide protection over the entire length. Next, as shown in FIG. 3, there is an opening at the center of the bottom of a triangular or trapezoidal shape (trapezoidal in this embodiment), which can be freely inserted into the opening groove portion 8 and the protective portion 9, and which has the bolt insertion hole. A wedge part 1 in which a protruding part 13' facing 12 and having a bolt screwing hole 12' with a threaded inner periphery formed therein stands upright at a substantially right angle.
0'.

Therefore, as shown in FIG.
From the oblique side where 7' is formed, as shown in the figure, insert one of the wedge parts 10 into the locking parts 5, 5'.
connecting portions 6, 6' and connecting portions 6-1 of the wedge portion 10,
6-1' are superimposed on each other, insert the connecting rods 14, 14' which are loosely inserted into the long connecting holes 11, 11' of the connecting parts 6-1, 6-1'. ,
The tips thereof are fixed to the connecting parts 6, 6', and the connecting parts 6, 6' and the connecting parts 6-1, 6-1' are configured so that they do not separate from each other. 12, a bolt-like fastening fitting 15 is inserted, and its tip end is screwed into the bolt screwing hole 12'.

Note that the wedge portions 10 and 10' are preferably curved to match the curved surface of the inner wall surface of the cylindrical body 1.

In the tube end face protector constructed as described above, when the fastening fitting 15 is rotated by an appropriate means such as a power tool or manually, the wedge portion 10 and
10' moves in the directions of arrows A and A' in FIG. By moving, the wedge parts 10, 10' overlap, and the protruding part 13' of the wedge part 10' is inserted into the opening groove part 8 of the wedge part 10. Finally, the respective protruding parts 13, 13' are in pressure contact with each other, and the locking parts 5, 5' are expanded to the maximum extent, and while being fixed thereto, the outer inner circumferential wall 4 is moved in the direction of the arrows B and B' in the figure. The diameter of the cylindrical body 1 is expanded.

Therefore, when using the pipe end face protector of the present invention to protect the end face of a pipe such as a wire pipe, the cylindrical body 1 of the protector of the present invention is attached to the open end of the pipe 16 to be protected, as shown in FIG. is fitted so that the flange 2 covers the end surface of the tube 16, and then the fastening fitting 15 is rotated to tighten the wedge portion 10,
10' are overlapped with each other and moved forward to expand the diameter of the cylindrical body 1, and the outer peripheral surface of the cylindrical body 1 is fixed to the inner surface of the tube 16 by being crimped.

In addition, when removing the protective device of the present invention from the pipe 16, the diameter of the cylindrical body 1 becomes smaller by rotating the fastening fitting 15 in the opposite direction to the above-mentioned installation, so that it can be easily removed. .

As shown in the figure, if a cushioning material/slip prevention piece 17 made of rubber, elastic plastic, etc. is attached to the outer peripheral wall of the cylindrical body 1, the tube 16
This is more preferable because it does not damage the inner surface of the tube 16, and the protective device itself of the present invention is difficult to separate due to the frictional resistance between the cushioning material and anti-slip piece 17 and the inner surface of the tube 16.

<Effects of the invention> As described above, according to the invention, when attaching to a pipe to be protected, such as a steel pipe, the protective device itself is inserted into the pipe and the tightening fitting is rotated using a power tool or manually. The cylindrical body of the protector is crimped onto the inner surface of the tube with strong force by rotating the tightening fitting, so the flange securely attaches to the end surface of the tube without coming off during transportation. It is possible to protect the

More specifically, in the pipe end face protector of the present invention, since both oblique sides of the locking part are equally pushed apart by both oblique sides of the wedge part, the center position of the tightening fitting does not shift. Since the expandable part expands in diameter with a uniform force, the diameter can be expanded smoothly, and furthermore, it can be crimped into the tube end with a uniform force, so that it can be firmly attached.

Furthermore, since the locking part and the wedge part are connected by the connecting rod, they will not come off due to external impact, and more complete protection can be achieved.

It should be noted that the protective device of the present invention can of course be prepared in several types depending on the diameter of the target pipe, but it can also be used for pipes with different diameters to some extent by adjusting the fastening fittings.

[Brief explanation of the drawing]

FIGS. 1 to 4 are explanatory diagrams of main parts of an embodiment of the pipe end face protector according to the present invention, and FIGS. 5 and 6 respectively.
Each figure is an explanatory diagram showing the same usage state. In the figure, 1... cylindrical body, 5, 5'... locking part, 6,
6'...Connection part, 6-1, 6-1'...Connection part,
7, 7'... Fallout prevention part, 8... Opening groove part, 9...
...Protective part, 10, 10'... Wedge part, 11, 11'...
...Elongated hole for connection, 12...Bolt insertion hole, 12'...
...Bolt threading hole, 13, 13'...projection.

Claims (1)

[Scope of utility model registration request] One end of the cylindrical body with open ends is bent outward to form a flange, a cut is provided across the flange to the other end of the cylindrical body, and both ends of the slit are cut to the required length. They are overlapped across the length to form a telescopic section, and with the tip of the inner circumferential wall of the telescopic section as a boundary, a slip-out prevention section is formed on one of the oblique sides on both sides, and a plate-shaped connecting section is formed on the other side at a substantially right angle. The triangular locking portions formed by bending are fixed so that their respective tops are facing each other, and at the same time, from the top to the bottom is placed in one of the triangular spaces formed between the respective locking portions. A protective portion is integrally formed so as to cover the opening groove, and has a hollow portion at the base end in which a bolt insertion hole is formed, and further has a hollow portion on both diagonal sides thereof. A connecting portion having a connecting elongated hole is fitted with a wedge portion having a shape similar to the space portion that stands upright at a substantially right angle, and a connecting rod is inserted into the connecting elongated hole in a loose manner. , the tip thereof is fixed to the connecting part of the locking part, and the other side of the space part has a bolt threading hole that can be freely inserted into the opening groove part and the protection part, and that is opposite to the bolt insertion hole. A tube end surface characterized in that the formed protruding portion is fitted with a wedge portion erected at a substantially right angle, and a bolt-shaped fastening fitting is screwed into the bolt threading hole through the bolt insertion hole. Protective equipment.