KR100816610B1 - Cutting the connection which is possible it will call and the public pressure hose and the manufacture system of couple which it has - Google Patents

Abstract

A pair of pneumatic hoses having a connection unit capable of being cut and a manufacturing system for the same are provided to facilitate the connection and distribution of the pneumatic hoses and to shorten the distribution time by arranging two pneumatic hoses at the same time through one work for connecting the pneumatic hose from a pneumatic unit to a pneumatic cylinder. A system for manufacturing a pair of pneumatic hoses(1,2) having a connection unit(3) capable of being cut produces the first and second pneumatic hoses by arranging the first and second pneumatic hoses made of thermoplastic resin and wound around winding reels, at one spot by a hose arranging device and transferring the pneumatic hoses in a longitudinal direction by a transfer device. The manufacturing system is composed of: a rotary shaft supported by a pair of bearing bosses(14) and turned by receiving power of a motor(11); a rotating electric conductor(16) fixed to the rotary shaft and provided with plural press protruded ring units(15) protruded on the outer peripheral part; an electric heater(18) installed at one side of the electric conductor to heat the press protruded ring units and to emit thermal energy by receiving electric energy by an electricity supply device(20); and a connection unit forming device(10) having a support protruded ring unit(17) fixed at a frame(13) disposed on the opposite side of the press protruded ring unit. The support protruded ring unit is fitted between the first and second pneumatic hoses passing through a hose support member(34) disposed at the lower side of the electric conductor, in order to form the connection unit between the first and second pneumatic hoses by pressing a portion of the outer peripheral parts of the first and second pneumatic hoses together with the press protruded ring unit.

Description

Cutting the connection which is possible it will call and the public pressure hose and the manufacture system of couple which it has}

1 is a schematic overall configuration showing a manufacturing process of the pneumatic hose according to the present invention,

2 is an overall schematic plan view showing a manufacturing process of the pneumatic hose according to the present invention;

3 is a front sectional configuration diagram of a manufacturing apparatus of a first embodiment according to the present invention;

FIG. 4 is an enlarged sectional view taken along line “X” of FIG. 3;

5 is a sectional view taken along the line Y-Y 'of FIG.

6 is an operation explanatory diagram of a pedestal according to the present invention;

Figure 7 is an enlarged cross-sectional view of the main portion illustrating the operation according to the present invention,

8 is a configuration diagram of a pair of pneumatic hose manufactured by the present invention,

9 is an explanatory view of the use of the pneumatic hose according to the present invention;

10 is a state diagram of use of the pneumatic hose according to the present invention,

11 is a configuration diagram of a manufacturing apparatus of a second embodiment according to the present invention.

Explanation of symbols on the main parts of the drawings

1,2: 1st, 2nd pneumatic hose 3: Connection part

4: Hose alignment device 6: Transfer device

10,10 ': connection part forming apparatus 11; motor

12: axis of rotation 15: pressure projection wheel

16: conductor 17: support protrusion

18: electric heater 20; Electric supply device

34: hose support member 38: rolling prevention member

The present invention relates to a pneumatic hose, and more particularly, to a pair of pneumatic hoses and a manufacturing apparatus for forming a connection between the pair of pneumatic hoses to have an equally spaced cutaway in the longitudinal direction.

In general, at least one to several dozen pneumatic cylinders are installed in industrial facilities or machinery, and pneumatic hoses are connected to the pneumatic cylinders to receive compressed air.

Specifically, in the pneumatic cylinder, two pneumatic hoses are connected to one pneumatic cylinder as is known in order to move the piston therein.

However, since the conventional pneumatic hoses are single, there are disadvantages in that the surroundings become very messy as many individual pneumatic hoses are connected in the case of machines or equipment in which several or dozens of pneumatic cylinders are installed.

In addition, even if a number of pneumatic hoses are arranged in order to be mixed with each other, when there is a need to replace the pneumatic hose connected to one pneumatic cylinder has a problem that is difficult to find.

Then, in the installation work connecting the pneumatic hose to one pneumatic cylinder, unscrew the individual pneumatic hose from the winding reel to one pneumatic port, and then unscrew the pneumatic hose from the winding reel to the other pneumatic port from the beginning. It has to be very cumbersome and takes a long time to work.

SUMMARY OF THE INVENTION The present invention provides a pair of pneumatic hoses having a connection portion that can be easily cut in an intermediate portion in providing a pair of pneumatic hoses in which two pneumatic hoses, which must be inevitably connected to one pneumatic cylinder, are integrally provided. There is a purpose.

It is a further object of the present invention to provide a pair of pneumatic hoses and a manufacturing apparatus having a cutaway connection made of a pair of pneumatic hoses extruded and produced.

Still another object of the present invention is to enable a continuous production of a pair of pneumatic hoses having a cutable connection so that they can be inexpensively supplied.

In order to achieve the above object, the present invention, the first and second pneumatic hoses are molded into a single shape and made of a thermoplastic resin and wound around a winding reel, respectively, to be aligned in one place by a hose alignment device, and the transfer device As a pair of first and second pneumatic hose to be produced while being conveyed in the longitudinal direction by the; A rotating shaft supported and supported by a pair of bearing bosses to receive motor power; A conductor fixed to the rotating shaft and configured to rotate by protruding a plurality of pressure protrusion wheel parts on an outer circumference; An electric heater installed at one side of a conductor to heat the pressurized protrusion part and supplied with electric energy by an electric supply device to generate heat energy; The connecting portion is connected between the first and second pneumatic hoses by pressing a portion of the first and second pneumatic hoses together with the pressure protrusion wheels which are inserted between the first and second pneumatic hoses passing through the hose support member under the conductor. One embodiment features a pair of pneumatic hose manufacturing apparatus having a connecting portion comprising a connecting portion forming device having a supporting protrusion wheel portion fixed to the frame opposite to the pressure protrusion wheel portion to be formed.

On the hose support member on both sides of the support protrusion wheel part, the screw shaft with the handle is fastened to the nut installed in the frame, and the ball shaft of the screw shaft is rotatably installed at the rear end of the push prevention member so that the roll prevention member is moved forward and backward by the screw shaft rotation. Another feature of the manufacturing apparatus is further configured to be movable in the direction.

The first and second pneumatic hoses, which are molded to be extruded in a single shape and made of thermoplastic resin, respectively wound on the winding reel, are aligned to be gathered in one place by a hose aligning device and conveyed in a longitudinal direction by a conveying device. To produce 1,2 pneumatic hoses; A rotation shaft supported and supported by a pair of bearing bosses to receive motor power; A conductor fixed to the rotating shaft and configured to rotate by protruding a plurality of pressure protrusion wheel parts on an outer circumference; Ultrasonic generator is installed so that the ultrasonic connection terminal is in contact with the conductor so that the ultrasonic wave is emitted from the pressing wheel portion; The connecting portion is connected between the first and second pneumatic hoses by pressing a part of the outer circumferential surface of the first and second pneumatic hoses together with the pressurized wheel parts that are inserted between the first and second pneumatic hoses passing through the hose support member under the conductor. A pair of pneumatic hose manufacturing apparatus having a connection part comprising a connection part forming apparatus having a support protrusion wheel part fixed to a frame at a position opposite to the pressure protrusion wheel part to be formed is another embodiment.

And using each of the first and second pneumatic hoses extruded and molded into a thermoplastic resin; The first and second pneumatic hoses are in close contact with each other so that the supporting protrusions are supported by the lower middle portion of the mutually contacting portion, and the pressing protrusions protruding at equal intervals from the outer periphery of the rotating conductor at the upper side are supported on the supporting protrusions. Another feature is a pair of pneumatic hoses having a cuttable connecting portion formed by connecting the first and second pneumatic hoses while melting the first and second pneumatic hoses at equal intervals.

The present invention will be described in more detail based on the attached preferred embodiments as follows.

1 is an overall schematic configuration diagram showing a manufacturing process of a pneumatic hose according to the present invention, Figure 2 shows an overall schematic plan configuration diagram.

Therefore, normally, the pneumatic hose is extruded into a single phase by the extrusion die of the extruder, and the material is manufactured by the urethane material which is a thermoplastic resin.

In addition, the individual pneumatic hose is wound on the take-up reel is spread on the market, the present invention is manufactured by using the pneumatic hose that is manufactured by the extrusion method as described above and wound on the take-up reel as described above. Done.

1 and 2, each of the first pneumatic hose 1 and the second pneumatic hose 2 unwinded from the winding reels 3, 3 ′, on which the individual pneumatic hoses 1, 2 are wound, respectively. The first and second pneumatic hoses (1,2) are collected in one place and moved in close contact with each other by passing through the alignment holes (5) of the hose alignment device (4) to allow one side portion to be in close contact with each other. The winding reels (L, L ') is already known, so detailed structure and description thereof will be omitted. In addition, the first pneumatic hose 1 and the second pneumatic hose 2 may be referred to as first and second pneumatic hoses 1 and 2.

Therefore, the first and second pneumatic hoses 1 and 2 are moved by the feed rollers 7 and 7 provided at the upper and lower portions of the first and second pneumatic hoses 1 and 2 in the feeder 6. Done. 8 and 8 'are belts and pulleys for rotating the feed rollers 7 and 7', and 9 is a motor.

The hose aligning device 4 is to be arranged so that the first and second pneumatic hoses (1,2) are gathered in one place, and the transfer device (6) also allows the first and second pneumatic hoses (1,2) to be transferred. In some cases, the present invention may be configured to have other structures in addition to those shown in the drawings.

Accordingly, in the present invention, the first and second pneumatic hoses 1 and 2 passing through the hose alignment device 4 pass through the hose alignment device 4 and then pass through the connecting portion forming means 10.

3 to 5 show a connection portion forming apparatus 10 of the first embodiment according to the present invention.

Referring to FIGS. 3 and 4, the rotating shaft 12 to which the motor 11 power is transmitted and rotated is supported by the bearing boss 14 fixed on the frame 13 to be rotatable.

Transmission of power from the motor 11 to the rotation shaft 12 may allow power to be transmitted by the belt 11a and the pulley 11b as shown in the drawing, and in some cases, a gear (not shown). Not only can the power be transmitted by them, but also by the chain and chain gear (not shown).

As shown in FIG. 5, a conductor 16 having a plurality of pressing protrusions 15 projecting at equal intervals on the circumferential surface is fixed to the rotation shaft 12 so as to be rotatable with the rotation shaft 12.

Under the conductor 16, the support protrusion wheel 17, which is installed relatively to the pressing protrusion 15, is fixed to the frame 13.

Therefore, when the conductor 16 rotates, a plurality of pressing protrusions 15 on the circumferential surface thereof are rotated while passing through the support protrusion wheel portion 17.

The electric heater 18 is fixedly installed at one side of the conductor 16, and the electric heater 18 is configured to generate heat energy by supplying electric energy by the electric supply device 20. Since the electric heater 18 is a known component, detailed drawings and descriptions thereof will be omitted.

Electric supply device 20 is a conductor ring 22 is installed on the outer periphery of the insulating material 21 fixed to a portion of the rotating shaft 12, the conductor ring 22 is an electric wire 23 connected to the electric heater 18 and There is an electric wire 23 'connected to a connecting terminal 25 fixed together with an insulating material 24 at one end of the rotating shaft 12 through the inside of the rotating shaft 12, and the connecting terminal 25 is an elastic member 26. The positive electrode pin terminal 27 is brought into close contact with the connecting terminal 25 by the positive electrode pin terminal 27, and the positive electrode pin terminal 27 can receive a positive power from the power source 28.

Therefore, even when the rotating shaft 12 is rotated, the connection terminal 25 is rotated and thus is in close contact with the positive electrode pin terminal 27 so that the power supply is smooth, and the electric heater 18 and the electric wires 23 and 23 'are insulated. Since it rotates together with the 24 and the conductor ring 22, the power is smoothly supplied from the power source 28.

In addition, the negative (-) power supply of the power supply 28 is installed on the conductor 16 by the support frame 13 'and the negative electrode pin terminal 30 and the electric wire (receiving elasticity by the elastic member 29) ( 31 to be supplied with negative (-) power, and the negative electrode pin terminal 30 is a resilient member 29 to the conductive ring body 33 fixed to the insulating material 32 installed on the conductor 16. It is made to be in close contact by elasticity of).

In addition, the conductive ring body 33 is connected to the electric heater 18 by an electric line 31 ′ so that it is supplied with negative (−) power.

Therefore, since the conductive ring 33 rotates as the conductor 16 rotates, the negative electrode pin terminal 30 is in close contact with the conductive ring 33 so that the negative power can be smoothly supplied to the electric heater 18. do.

Therefore, since the rotary shaft 12 and the conductor 16 are supplied to the electric heater 18 while being rotated, the electric heater 18 generates heat energy, and the heat energy is transmitted to the conductor 16.

The amount of heat energy generated by the electric heater 18 is controlled by a controller (not shown) to generate the heat energy. The heating temperature of the conductor 16, which is transferred to the heat energy group from the electric heater 18 and becomes hot, is heated to a temperature (about 60 ° C.) capable of melting the first and second pneumatic hoses 1 and 2, which are thermoplastic resins.

The electric supply device 20 according to the present invention is for supplying electric energy to the electric heater 18. Therefore, the electricity supply device 20 shown in the drawings is not necessarily implemented, and in some cases, an electricity supply device having a different configuration may be employed.

The nut shaft 37 of the frame 13 is provided with screw shafts 36 which are rotated by the handle 35 on both sides of the hose support member 34 installed on both sides of the support protrusion wheel 17 under the conductor 16. It is fastened to and moved in the front and rear directions, the ball portion (36a) provided on the screw shaft 36 is installed to be rotatable in the rear end portion (38a) of the anti-roll member 38. Since the structure in which the ball portion 36a is rotatable in the rear end 38a is a known structure, detailed drawings and descriptions thereof will be omitted.

Therefore, when the handle 35 is rotated in the left or right direction, the sliding prevention member 38 is moved in the forward and backward directions as the screw shaft 36 is moved forward and backward.

As shown in FIG. 6, the anti-rolling member 38 blocks the first and second pneumatic hoses 1 and 2 from being pushed to both sides when passing through the support protrusion wheel part 17. As shown in Fig. 2, the first and second pneumatic hoses 1 and 2 are dug in. At this time, the first and second pneumatic hoses (1, 2) are in a slightly crushed state.

Next, the first and second pneumatic hoses slightly supported above the support protrusion wheel part 17 while the pressure protrusion wheel part 15 is rotated as shown in FIG. 5 while the conductor 16 is rotated as shown in FIG. 5. The (1, 2) part is pressed.

At this time, since the pressure protrusion wheel part 15 is pressurized in a hotly heated state, the first and second pneumatic hoses 1 and 2 which are between the support protrusion wheel parts 17 are melted as shown in FIG. The connection part 3 which integrally connects between the 1st and 2nd pneumatic hoses 1 and 2 like (c) of 7 is formed.

In addition, since the conductor 16 is continuously rotated, the first and second pneumatic hoses 1, which are sequentially supported by the support protrusion wheel part 17, are sequentially supported by the pressure protrusion wheel parts 15 provided on the conductor 16 at equal intervals. 2, the connection part 3 is formed at equal intervals between the long first and second pneumatic hoses 1 and 2 as shown in FIG. The two pneumatic hoses 1 and 2 are integrated.

As described above, the first and second pneumatic hoses 1 and 2 integrated as described above may be connected to each other by a certain length when connecting to the pneumatic cylinder S, as illustrated in FIGS. 9 and 10. .

At this time, the first and second pneumatic hoses are cut by cutting the connecting portion 3 between the first and second pneumatic hoses 1 and 2, which are to be separated from each other, using a tool such as a knife or scissors. (1, 2) end is used to connect the pneumatic cylinder (S).

Therefore, the pair of first and second pneumatic hoses (1, 2) are the first and second pneumatic hoses (1, 2) because the remaining parts are connected by the connecting portion (3) except for the portion connected to the pneumatic cylinder (S) Can be connected to the pneumatic unit (not shown) in a concise state without being messy.

FIG. 11 shows a second embodiment of the present invention. In the connection portion forming apparatus 10 'of the second embodiment of the present invention, ultrasonic waves generated by the ultrasonic generator 18' are transmitted through the ultrasonic connection terminal 18'a. The electricity is supplied to the conductor 16 to be discharged to the pressure protrusion wheel 15. Since the ultrasonic generator 18 'is already known, detailed drawings and descriptions thereof will be omitted.

Accordingly, the conductor 16 is rotated to press the first and second pneumatic hoses 1 and 2 located above the support protrusion wheel 17 by the pressure protrusion wheel 15 as in the first embodiment. At this time, the first and second pneumatic hoses (1,2) pressurized by the ultrasonic waves emitted from the pressure protrusion (15) is melted to form a connecting portion (3) to connect the first and second pneumatic hoses (1,2) Will be.

That is, in the first embodiment, the first and second pneumatic hoses 1 and 2 are melted by thermal energy to form the connection part 3, but the second embodiment is the first and second pneumatic hoses 1 and 2 by ultrasonic waves. Melt to make the connection (3) is formed. Therefore, the configuration of the second embodiment except for the electric heater 18 of the first embodiment and the portion of the electric supply device 20 for supplying electric energy to the electric heater 18 is the same as that of the first embodiment. Therefore, the same parts as in the first embodiment will be omitted.

Therefore, since the conductor 16 is continuously rotated, the first and second pneumatic hoses having the pressure protrusion wheel portions 15 provided on the conductor 16 at equal intervals are sequentially supported by the support protrusion wheel portions 17 ( As the first and second pneumatic hoses 1 and 2 are formed at equal intervals as shown in FIG. It will be the same as the embodiment.

Therefore, in the present invention, the first and second pneumatic hoses 1 and 2 are brought into close contact with each other by the manufacturing apparatus of the first and second embodiments so that the support protrusion wheel 17 is supported in the middle lower portion of the parts in contact with each other. The pressure protrusion wheel part 15 protruding at equal intervals on the outer periphery of the conductor 16 to be melted and pressurized while melting the first and second pneumatic hoses 1 and 2 supported on the support protrusion wheel part 17. 2 pairs of pneumatic hoses (1,2) is to obtain a pair of pneumatic hoses are formed so that the connecting portion (3) is formed at equal intervals.

Therefore, the present invention connects the pneumatic hose using a pair of pneumatic hose when connecting the pneumatic unit and the pneumatic cylinder, so that the work is faster and easier than connecting them individually one by one to improve the efficiency of the work.

In addition, since the connection part 3 is cut and used as necessary, it is convenient to use and a pair of pneumatic hoses are wired so that the wiring state is not messy and is cleaned.

According to the above description, the present invention provides a pair of pneumatic hoses in which two pneumatic hoses, which must be inevitably connected to one pneumatic cylinder, are integrated, thereby connecting the pneumatic hose from the pneumatic unit to the pneumatic cylinder. Since two pneumatic hoses can be wired at the same time, it is easy to connect and wire the pneumatic hose and shorten the wiring time, and when disconnecting a pair of pneumatic hoses, the connection part can be cut off and used only as long as necessary. It provides the effect that convenience is aimed at.

The present invention has an effect of providing a pair of pneumatic hoses and a manufacturing apparatus having a cutable connection portion, which is primarily made of a pair of pneumatic hoses, produced by the extrusion method first, and a cutable connection portion Since it is possible to continuously produce a pair of pneumatic hose having a low cost to provide the effect.

Claims (8)

The first and second pneumatic hoses 1 and 2, which are molded to be extruded in a single shape and made of thermoplastic resin and wound on the winding reels L and L ', respectively, are arranged to be gathered together by the hose aligning device 4. And a pair of first and second pneumatic hoses (1,2) to be manufactured while being conveyed in the longitudinal direction by the conveying device (6); A rotating shaft 12 which is supported and rotated by a pair of bearing bosses 14 by receiving power from the motor 11; A conductor 16 fixed to the rotation shaft 12 and having a plurality of pressure protrusion wheel parts 15 protruding and rotating on an outer circumferential edge thereof; An electric heater (18) installed at one side of the conductor (16) to heat the pressure protrusion (15) and supplied with electric energy by an electric supply device (20) to generate heat energy; The first and second pneumatic hoses (15) together with the pressurized protrusions (15) inserted and heated between the first and second pneumatic hoses (1,2) passed through the hose support member (34) below the conductor (16). 1,2) a support stone fixed to the frame 13 opposite to the pressure protrusion wheel 15 so that a connection portion 3 is formed between the first and second pneumatic hoses 1 and 2 by pressing a portion of the outer peripheral surface. A pair of pneumatic hose manufacturing apparatus having a cutaway connection portion, characterized in that it comprises a connection portion forming apparatus (10) having a wheel portion (17). The screw shaft (36) having the handle (35) on the hose support member (34) on both sides of the support protrusion (17) is fastened to the nut (37) provided in the frame (13), The ball portion 36a of the 36 is rotatably installed at the rear end 38a of the anti-rolling member 38 so that the anti-rolling member 38 can move forward and backward by rotating the screw shaft 36. A pair of pneumatic hose manufacturing apparatus having a cuttable connection, characterized in that further configuration. The electric power supply device of claim 1, wherein the electric supply device (20) is connected such that a conductor ring (22) fixed to the rotating shaft (12) is insulated by an insulating material (21) so as to be connected to the electric heater (18) by an electric wire (23). And the conductor ring 22 is connected to a connection terminal 25 fixed to an insulator with an insulating material 24 at an end of the rotation shaft 12 by an electric line 23 'wired through the inside of the rotation shaft 12. The terminal 25 is in contact with the positive electrode pin terminal 27 receiving the positive current from the power source 28 and receiving the elastic member 26 in the frame 13, and the electric wire 31 from the power source 28. The negative electrode pin terminal 30, which is supplied with a negative current through the support frame 13 'and receives the elasticity of the elastic member 29 on the support frame 13', is electrically insulated by the insulating material 32 on the outer peripheral surface of the conductor 16. The conductive ring 33 is in contact with the ring body 33 and is electrically connected to the electric heater 18 by an electric line 31 ′. A pair of pneumatic hoses apparatus having a connecting piece, characterized in that the cutout made to be configured to supply electrical energy to 18. The first and second pneumatic hoses 1 and 2, which are molded to be extruded in a single shape and made of thermoplastic resin and wound on the winding reels L and L ', respectively, are arranged in one place by the hose aligning device 4. And a pair of first and second pneumatic hoses (1, 2) are manufactured while being conveyed in the longitudinal direction by the conveying device (6); A rotating shaft 12 which is supported and rotated by a pair of bearing bosses 14 by receiving power from the motor 11; A conductor 16 fixed to the rotation shaft 12 and having a plurality of pressure protrusion wheel parts 15 protruding and rotating on an outer circumferential edge thereof; An ultrasonic generator (18 ') installed so that the ultrasonic connection terminal (18'a) is in contact with the conductor (16) so that the ultrasonic waves are emitted from the pressure protrusion (15); The first and second pneumatic hoses (15) together with the pressurized protrusions (15) inserted and heated between the first and second pneumatic hoses (1,2) passed through the hose support member (34) below the conductor (16). 1,2) a support stone fixed to the frame 13 opposite to the pressure protrusion wheel 15 so that a connection portion 3 is formed between the first and second pneumatic hoses 1 and 2 by pressing a portion of the outer peripheral surface. A pair of pneumatic hose manufacturing apparatus having a cutaway connecting portion, characterized in that it comprises a connecting portion forming device (10 ') having a wheel portion (17). The screw shaft (36) having a handle (35) on the hose support member (34) on both sides of the support protrusion (17) is fastened to a nut (37) provided in the frame (13), and the screw shaft ( The ball portion 36a of the 36 is rotatably installed at the rear end 38a of the slide preventing member 38 so that the roll preventing member 38 can move forward and backward by the rotation of the screw shaft 36. A pair of pneumatic hose manufacturing apparatus having a cuttable connection, characterized in that configured. Using each of the first and second pneumatic hoses 1 and 2 extruded and molded into a thermoplastic resin; The first and second pneumatic hoses (1,2) are in close contact with each other so that the supporting protrusion wheel portion (17) is supported on the lower side of the middle of the contact portion, and the upper side protrudes at equal intervals on the outer periphery of the conductor (16) rotated. The pressure protrusion wheel part 15 pressurizes the first and second pneumatic hoses 1 and 2, which are supported on the support protrusion wheel part 17, and presses them at equal intervals between the second and second pneumatic hoses 1 and 2, respectively. A pair of pneumatic hoses having a cutaway connection, characterized in that (3) is formed. The method according to claim 6, wherein the pressure protrusion wheel portion 15 receives heat energy by the electric heater 18 to melt the first and second pneumatic hoses (1, 2) portion supported on the support protrusion wheel portion 17. A pair of pneumatic hoses having a cutaway connection, characterized in that the pressure is formed by the connection portion (3). The method of claim 6, wherein the pressure protrusion wheel portion 15 emits the ultrasonic wave generated by the ultrasonic generator 18 'to provide a portion of the first and second pneumatic hoses (1, 2) supported on the support protrusion wheel portion 17. A pair of pneumatic hoses having a cutaway connection, characterized in that the connection portion (3) is formed by pressing while melting.

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