JP4495088B2 - String-shaped body for expanding and holding tube for cold shrink tube and expanding tube - Google Patents

Description

  The present invention relates to a string-like body for an enlarged diameter holding cylinder for holding an ordinary temperature shrinkable tube in an expanded state, and an expanded diameter holding cylinder using the same.

  A normal temperature shrinkable tube in which a diameter-enlarged holding cylinder is inserted inside a diameter-enlarged rubber tube and the rubber tube is maintained in an expanded state is widely used as a protective member for a connection portion of a cable or a tube. This room temperature shrinkable tube is put on the connection part of the cable or tube, and if the expansion holding cylinder is removed, the rubber tube shrinks and adheres closely to the connection part of the cable or tube. There is an advantage that a watertight structure can be obtained.

  As the expansion holding cylinder of the normal temperature shrinkable tube, various types have been developed in which a string-like body is spirally wound into a cylindrical shape so that it can be easily removed after being covered with a cable connection part, etc. (See Patent Documents 1 to 4)

  The string-like body used for the conventional diameter expansion holding cylinder is shown in FIG. The string-like body 10 includes an outer peripheral side protruding part 14 that protrudes laterally from the outer side when wound spirally on one side surface of the string main body part 12 having a substantially rectangular cross section, and the outer peripheral side protruding part. An inward projecting edge 16 that protrudes toward the inner circumference side when spirally wound from the tip edge of the portion 14 is formed, and is wound spirally on the other side surface of the string body 12 Sometimes the inner peripheral side overhanging part 18 projecting laterally from the inner peripheral side and the outward direction projecting from the tip edge of the inner peripheral side overhanging part 18 to the outer peripheral side when spirally wound A protruding edge 20 is formed. The material of the string-like body 10 is generally a thermoplastic plastic such as polypropylene or polyethylene.

  As shown in FIG. 6, the string-like body 10 is spirally wound so that the inward protruding edge 16 and the outward protruding edge 20 are engaged (engaged) with each other, and the outer circumferential side protruding portion 14 and the outward protruding edge The diameter expansion holding cylinder 22 is formed by intermittently welding the contact surface C with the edge 20. The reason why the welding is intermittently performed is that, when the diameter holding cylinder 22 is later removed from the normal temperature shrinkable tube, if the string-like body 10 is pulled, the welded portion is separated and the string-like body 10 can be easily pulled out. It is to do.

FIG. 7 shows a manufacturing method of the expanded diameter holding cylinder. String-like body 10, the mandrel 24 rotating while supporting one side shaft 26, is wound by adding a predetermined tension. The mandrel 24 has a flange 28 at the end on the side of the shaft 26, and the string-like body 10 is in contact with the outward projecting edge 20 of the string-like body 10 wound one round before the flange 28. It is wound so that the inward protruding edge 16 of the string-like body 10 to be wound around is engaged. At the winding position, an oscillator 30 of an ultrasonic welder is installed, and ultrasonic waves are intermittently oscillated from the oscillator 30, so that the outer peripheral side protruding portion 14 of the string-like body 10 and the outward protruding edge 20 are in contact with each other. Surface C is welded intermittently. As the winding of the string-like body 10 proceeds, the formed enlarged diameter holding cylinder 22 is pushed in the axial direction by the newly wound string-like body 10 and gradually moves to the release end side of the mandrel 24, The mandrel 24 is separated from the open end. The formed expanded diameter holding cylinder 22 is cut to a required length and used as an expanded diameter holding member for a cold shrink tube.

Japanese National Patent Publication No. 10-513337 Japanese Patent Laid-Open No. 11-289627 JP 2002-120289 A JP 2004-328910 A

  When the diameter expansion holding cylinder is manufactured using the conventional string-like body, there is a problem that the welding state is likely to vary and excessive welding is likely to occur. If excessive welding occurs, cracks and tears are likely to occur in the welded part, and when the string is pulled out from the room temperature shrinkable tube, the welded part becomes a protruding state and damages the room temperature shrinkable tube, or fragments are damaged by the room temperature. There is a risk of remaining at the interface of the shrinkable tube and reducing the electrical performance.

As one of the causes of the variation in the welded state, when ultrasonic welding is performed while winding the string-like body around the mandrel, the position of the oscillator 30 and the string-like body 10 is slightly shifted, and as a result, the bottom of the groove It is conceivable that they are welded at the center or at the corners.
Further, when the mandrel is detached, there is a problem that the inner and outer diameters of the expanded holding cylinder contract by the amount that the string-like body is stretched by the winding tension (elastic deformation).

Accordingly, an object of the present invention is to reduce the inner and outer diameter reduction when the detachment from the mandrel is small, and to reduce the variation in the welded state of the welded portion between the outer peripheral protruding portion and the outward protruding edge. And it is providing the diameter expansion holding cylinder using it.

In order to achieve this object, the present invention provides an outer peripheral side protruding portion that protrudes laterally from the outer periphery side when spirally wound on one side surface of a string body portion having a substantially rectangular cross section, and this outer peripheral side. When forming an inward protruding edge that protrudes to the inner circumferential side when spirally wound from the leading edge of the overhang portion, and when spirally wound on the other side surface of the string body An inner peripheral side protruding portion that protrudes laterally from the inner peripheral side, and an outward protruding edge that protrudes to the outer peripheral side when spirally wound from the tip edge of the inner peripheral side protruding portion Formed , spirally wound so that the inward protruding edge and the outward protruding edge engage with each other, and welded to the contact surface between the outer peripheral protruding portion and the outward protruding edge, thereby expanding the temperature-shrinkable tube diameter expansion holding cylinder In the string that forms
When this string-like body is spirally wound to form an enlarged diameter holding cylinder, the side surface of the string main body portion and the side surface of the inner peripheral overhanging portion are pressed and brought into a close contact state. And a raised portion having a cross-sectional triangle shape or a circular arc shape is formed on the inward surface of the outer peripheral projecting portion or the outward surface of the outward projecting edge .

Further, cold shrink tube diameter holding cylinder according to the present invention, the string-like body that is configured as described above, the inward projecting edge and the outward flange is wound in a spiral shape so as to engage, One side surface of the string main body portion and the side surface of the inner peripheral side overhanging portion are pressed and in close contact with each other, and the contact surface between the outer peripheral side overhanging portion and the outward protruding edge is welded. It is characterized by.

Since the string-like body according to the present invention is formed with the bulge portion, when the spirally wound body is formed to form the enlarged diameter holding cylinder, one side surface of the string main body portion and the side surface of the inner peripheral side overhang portion Is pressed and brought into close contact with each other (that is, because the adjacent string-like bodies are pressed against each other), when the string-like body is stretched by the winding tension when it is detached from the mandrel. Even if it tries to shrink by (elastic deformation), it becomes difficult to shrink. Therefore, the reduction in inner and outer diameters when separated from the mandrel can be kept small. In addition, the string-like body according to the present invention has a triangular section or an arc-shaped raised portion formed on the inward surface of the outer peripheral side overhanging portion or the outward surface of the outward protruding edge. Since welding starts and the spread of the welding range is restricted, portions other than the original welding point are not welded. For this reason, variations in the welded state are reduced, and excessive welding is difficult to occur.

  [Embodiment 1] FIG. 1 shows an embodiment of a string-like body for an ordinary temperature shrinkable tube expansion holding cylinder according to the present invention. The string-like body 32 is formed on one side surface of the string main body portion 12 having a substantially rectangular cross section, and the outer peripheral side overhanging portion 14 projecting laterally from the outer circumference side when wound in a spiral shape. An inward projecting edge 16 that protrudes toward the inner circumference side when spirally wound from the tip edge of the portion 14 is formed, and is wound spirally on the other side surface of the string body 12 Sometimes the inner peripheral side overhanging part 18 projecting laterally from the inner peripheral side and the outward direction projecting from the tip edge of the inner peripheral side overhanging part 18 to the outer peripheral side when spirally wound It is the same as the conventional string-like body 10 in that the protrusion 20 is formed. In addition, the inner peripheral side overhanging portion 18 is formed thicker than the outer peripheral side overhanging portion 14, and the inward protruding edge 16 and the outward protruding edge 20 are formed in the upper half of the string main body portion 12 (when spirally wound). It is located on the outer periphery side.

  The feature of the string-like body 32 is that a protruding portion 36 having a triangular cross-section intersecting with the length direction of the string-like body is formed on the inward surface of the outer circumferential side overhanging portion 14 and the inner circumferential side overhanging portion. The bulging portion 34 is formed on the side surface 18.

  As shown in FIG. 2, the string-like body 32 configured as described above is spirally wound so that the inward protruding edge 16 and the outward protruding edge 20 are engaged, and the outer peripheral side overhanging portion 14 and the outside The diameter-enlarged holding cylinder is formed by intermittently welding the contact surface with the facing protrusion 20.

  In the diameter-enlarged holding cylinder formed in this manner, when the outer peripheral side protruding portion 14 and the outward projecting edge 20 are welded, welding starts from the tip of the protruding portion 36 having a triangular cross section, and the expansion of the welding range is restricted. Therefore, portions other than the original welding point are not welded. For this reason, there is less variation in the welded state, and excessive welding hardly occurs. Therefore, the allowable range for the positional deviation of the oscillator 30 of the ultrasonic welder is also widened. Moreover, the tolerance | permissible_range with respect to the variation in the fitting condition of the protruding edges 16 and 20 becomes wide.

  In addition, since the string-like body 32 is formed with the bulging part 34 on the side surface of the inner peripheral side overhanging part 18, when the diameter-enlarged holding cylinder 38 is formed by being spirally wound, Since the side surface of the inner side and the side surface of the inner peripheral side overhanging portion 18 are pressed and brought into close contact with each other (that is, the adjacent string-like bodies 32 are pressed against each other), Even if the body 32 is contracted by the amount stretched by the winding tension (elastic deformation), it is difficult to contract. Therefore, the reduction in inner and outer diameters when separated from the mandrel can be kept small.

  In order to confirm this point, a result of manufacturing an enlarged diameter holding cylinder using the string-like body of the present invention and a conventional string-like body and comparing the inner diameter dimensions of the manufactured enlarged diameter holding cylinder will be described. A conventional string-like body has a width W = 7 mm and a thickness T = 5.5 mm. On the other hand, the string-like body of the present invention is obtained by expanding the side surface of the inner peripheral overhanging portion 18 by 0.2 mm. The height H of the raised portion 36 is 0.1 mm. The mandrel around which the string-like body is wound has an outer diameter of 144.8 mm. The parameters of string tension, mandrel rotation speed, ultrasonic welding horn (oscillator) pressure, and amplitude were the same. The inner diameter was measured with a caliper, and several points were measured per sample, and the maximum value was recorded. The measurement results are shown in Table 1.

  According to Table 1, the diameter-enlarged holding cylinder using the string-like body of the present invention has a significantly smaller inner diameter reduction and less variation in the inner-diameter dimension than the diameter-enlarged holding cylinder using the conventional string-like body. I understand that

  [Embodiment 2] FIG. 3 shows another embodiment of a cord-like body for a cold shrinkable tube expansion holding cylinder according to the present invention. The string-like body 32 is formed by forming a raised portion 36 having an arcuate cross section on the inward surface of the outer peripheral side overhanging portion 14. Since the other configuration is the same as that of the first embodiment, the same parts are denoted by the same reference numerals and description thereof is omitted. Even with such a configuration, the same effect as in the first embodiment can be obtained.

  [Embodiment 3] FIG. 4 shows still another embodiment of the cord-like body for cold-shrinkable tube expansion holding cylinder according to the present invention. The string-like body 32 is formed by flattening the inward surface of the outer peripheral overhanging portion 14 (no bulging portion) and forming a bulging portion 36 having a triangular cross section on the outward surface of the outward protruding edge 20. Since the other configuration is the same as that of the first embodiment, the same parts are denoted by the same reference numerals and description thereof is omitted. Even with such a configuration, the same effect as in the first embodiment can be obtained.

The expanded sectional view which shows one Embodiment of the string-like body for normal temperature shrinkable tube diameter expansion holding cylinders concerning this invention. The principal part expanded sectional view of the diameter expansion holding cylinder formed with the string-like body of FIG. The expanded sectional view showing other embodiments of the string object concerning the present invention. The expanded sectional view which shows other embodiment of the string-like body which concerns on this invention. The expanded sectional view which shows the string-like body for the conventional cold shrinkable tube diameter expansion holding cylinder. The principal part expanded sectional view of the diameter expansion holding | maintenance cylinder formed with the string-like body of FIG. The manufacturing method of a diameter expansion holding cylinder is shown, (A) is a front view, (B) is a top view.

Explanation of symbols

12: String main body part 14: Outer peripheral side protruding part 16: Inward protruding edge 18: Outer peripheral side protruding part 20: Outward protruding edge 32: String-like body 34: Swelling part 36: Raised part

Claims (2)

On one side surface of the string body portion (12) having a substantially rectangular cross section, an outer peripheral overhanging portion (14) projecting laterally from the outer peripheral side when wound spirally, and a tip of the outer peripheral side overhanging portion From the edge, an inward protruding edge (16) that protrudes to the inner circumference side when wound in a spiral shape is formed, and wound in a spiral shape on the other side surface of the string main body portion (12) Sometimes the inner peripheral side overhanging portion (18) that protrudes laterally from the inner peripheral side and the outer edge projecting toward the outer peripheral side when spirally wound from the tip edge of the inner peripheral side protruding portion An outward projecting edge (20) and spirally wound so that the inward projecting edge (16) and the outward projecting edge (20) are engaged with each other. In the string-like body forming the cold shrink tube diameter expansion holding cylinder by welding the contact surface with the edge (20) ,
When this string-like body is spirally wound to form an expanded diameter holding cylinder, one side surface of the string main body portion (12) and the side surface of the inner peripheral side overhang portion (18) are pressed and brought into close contact with each other. The bulging portion (34) is formed so that the ridge portion (34) has a triangular cross section or a circular arc cross section on the inward surface of the outer peripheral side overhang portion (14) or the outward surface of the outward protrusion edge (20) ( 36) A cord-like body for a cold-shrinkable tube expansion-holding cylinder characterized by forming String-like body of claim 1 wherein (32), said inward flange (16) outwardly projecting edge (20) is wound spirally so as to engage, one cord body portion (12) And the side surface of the inner peripheral overhanging portion (18) are pressed and in close contact with each other, and the contact surface between the outer peripheral side overhanging portion (14) and the outward projecting edge (20) is welded. A temperature-shrinkable tube expansion holding cylinder characterized by being made .

Images