JPH0242602Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a device for protecting the end face of pipes such as steel pipes, that is, a pipe end face protector formed to be attached to the end face of the pipe in order to prevent the end face of the pipe from being damaged during transportation. It is something.

Various types of tube end face protectors of this type have been provided in the past, but all of them have major drawbacks. That is, as shown in FIG. 1, a flange b is attached to one end surface of a short cylindrical body a that is open at both ends, a punching claw C is protruded from the side surface of the cylindrical body a to prevent it from coming off, and the cylindrical body a and the flange b are attached. There is a device in which a single cut is provided in the longitudinal direction through the tube, and a curved chevron-shaped piece d is abutted on the inside of the cut while straddling the cut, but the above-mentioned pipe end face protector has a narrow allowable range of expansion and contraction, making it difficult to apply. There were some imperfections. That is, in the case of the one shown in FIG. 1, the diameter of the cylindrical body a becomes larger due to the elongation of the curved chevron-shaped piece d, and the cylindrical body a is attached to the steel pipe B.
The expansion/contraction rate is determined by the length of the curved chevron piece d, and when used for pipes with different inner diameters, it can only be used for tubes within the range of the expansion/contraction rate.
Large restrictions were placed on the types of pipes that could be applied, and the scope of application was extremely narrow, making it impractical.

The present invention aims to provide a tube end face protector that eliminates the above-mentioned drawbacks. A part of the pipe end of the shaped body is cut, the cut parts are overlapped with each other to form a telescopic part, and guide members are fixed to both sides of this telescopic part so as to gradually narrow the mutual interval in the axial direction. A cotter plate of a required length is fitted between the guide members, and a plurality of elastic pieces are attached to the outer peripheral surface of the cylindrical body, and the cotter plate is moved in the front and back direction using a screw rod. Then, the guide members are pushed outward with the roller plates, and the pressure expands the elastic part of the cylindrical body to press the elastic piece on the outer circumferential surface of the cylindrical body to the inside of the tube, and the flange of the cylindrical body is pressed. This is a pipe end face protector that is formed so that it can be worn on the end face of a pipe, and is characterized in that it can be easily attached to pipe ends of small to large diameters to protect the pipe end face. be.

Hereinafter, the present invention will be explained in detail based on examples.

FIG. 2 is a perspective view of the main parts of the pipe end protector A of the present invention. A flange portion 2 is provided integrally by bending, a portion is cut from the flange portion 2 to the peripheral end portion 1a of the cylindrical body 1, and the cut portions are overlapped with each other to form a structure capable of sliding left and right. Forms an elastic part 3, and both sides 3 of this elastic part 3
Guide members 4 and 5 are fixed to a and 3b, respectively, so as to gradually narrow the mutual interval along the axial direction, and a screw rod 7 is inserted between the guide members 4 and 5, and a cotter plate 6 that moves in the front-back direction is attached to the guide members 4 and 5. The screw rod 7 is fixed to one end and fitted, and the other end of the screw rod 7 is passed through the elongated hole 9 of a bracket 8 extending in a substantially horizontal direction from the tip of the guide member 4 so that it can protrude from the bracket 8. A nut 10 is screwed onto the tip of the screw rod 7, and the other end of the screw rod 7 is fixed to the bracket 8 by tightening the nut 10. or,
An elastic piece 13 is adhered to the outer circumferential surface 1b of the cylindrical body 1, but instead of an elastic piece, an elastic body covering the entire outer circumferential surface 1b may be used, for example.

The pipe end protector A of the present invention is constructed as described above, and when attaching the pipe end protector A to the steel pipe B, first attach the tip of the screw rod 7 as shown by the solid arrow in FIG. Loosen the nut 10 to be screwed on, push out the bolter plate 6 fixed to one end of the screw rod 7 in the direction of the flange 2, and contract the extensible parts 3 of the cylindrical body 1 in the direction in which they overlap with each other. The outer diameter is made smaller than the inner diameter of the steel pipe B, the cylindrical body 1 is inserted inside the steel pipe B, and the flange 2 is brought into contact with the pipe end surface 11 of the steel pipe B.

Next, rotate the screw rod 7 provided on the telescopic part 3,
The screw rod 7 is moved in the direction shown by the imaginary line in FIG. 2 to move the bolter plate 6 along the inside of the guide members 4 and 5. At this time, since the guide members 4 and 5 are fixed so that the distance between them narrows in the direction in which the pilot board 6 advances, the guide members 4 and 5 are not pushed outward at both ends of the pilot board 6, respectively. do. Therefore, the extensible parts 3a and 3b of the cylindrical body 1, whose ends are connected to the guide members 4 and 5, respectively, are pushed out in the same direction as the guide members 4 and 5, that is, outwardly, and finally the cylindrical body 1 is expanded. Peripheral end 1a
is pressed against the inner peripheral surface 12 of the steel pipe B. In addition, since the elastic body 13 is attached to the outer circumferential surface 1b of the cylindrical body 1, when it is crimped to the inner circumferential surface 12 of the steel pipe B, the frictional resistance becomes large, and vibrations occur during transportation of the steel pipe B. The screw rod 7 will not loosen due to vibration even if the
It also has the role of being more strongly crimped and preventing it from coming off easily. In this case, the elastic piece 13 is made of, for example, synthetic rubber, and a synthetic rubber adhesive is used as the bonding method;
It is not limited to adhesives.

Furthermore, since the portion of the screw rod 7 that can penetrate the bracket 8 tends to move in the circumferential direction simultaneously with the outward movement of the expandable parts 3a and 3b, an elongated hole 9 is provided in the bracket 8 in advance. The bracket 8 is made movable by a length of , and the screw rod 7 is always fixed on the same line so as not to move.

In this way, the tube end protector can be easily attached to the tube end surfaces of various diameters, and the inside of the collar 2 can be attached to the tube end surface 11.
The tube end surface 11 is protected by being pressed against the tube end surface 11.

Therefore, in the present invention, by adjusting the length of the pilot plate 6 fitted between the guide members 4 and 5 and the overlapping portion of the telescopic portion 3 of the cylindrical body 1, it is possible to change the diameter from a small diameter to a large diameter. Since it can be attached to pipes, its range of application can be expanded.

Incidentally, FIG. 3 is an explanatory diagram of the installed state of the tube end face protector A of the present invention.

As described above, according to the present invention, a collar is placed over the easily damaged end face of the pipe to protect the end face, and in this case, attachment and removal of the protector is easier than with conventional products, and the screw rod By the movement of the bolter plate as it rotates, protectors can be attached to various pipe ends within a short period of time, and the attachment of elastic pieces ensures that the screw rods will not loosen due to vibrations, etc. Since it is possible to protect the tube end surface, the practical effect is much greater than that of conventional products.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of a conventional pipe end face protector;
The figure is a perspective view showing the main parts of the original pipe end face protector, and FIG. 3 is an explanatory view showing the attached state of the original pipe end face protector. In the figure, A...Pipe end face protector, B...Steel pipe, 1...
...Cylindrical body, 2...Brim part, 3...Extensible part, 4, 5...
...Guide member, 6...Cotter plate, 7...Screw rod, 11...Pipe end surface, 13...Elastic piece.

Claims (1)

[Scope of utility model registration request] One end of the cylindrical body is bent outward to form a flange, a part of which is cut from the flange to the tube end of the cylindrical body, and the cut parts are overlapped with each other to form an expandable part. A guide member is fixed to each side of the cylindrical body so as to gradually narrow the mutual interval along the axial direction, a cotter plate of a required length is fitted between the guide members, and is equipped with a plurality of elastic pieces, moves the above-mentioned cotter plate in the front and back direction with a screw rod, pushes the guide member outward with the cotter plate, and uses the pressure to push and expand the extensible part of the cylindrical body. A tube end surface protector formed by crimping an elastic piece on the outer circumferential surface of a cylindrical body to the inside of the tube, and wearing the end surface of the tube at the flange of the cylindrical body.