JP4579852B2 - Cold shrink cylindrical rubber unit - Google Patents

Description

The present invention relates to a cold-shrinkable cylindrical rubber unit in which a cylindrical rubber used for mechanical and electrical protection of a connection portion of a power cable, waterproofing of a pipe and the like is held in an expanded state.

  The cold-shrinkable cylindrical rubber unit, in which a rigid cylindrical body is inserted inside the expanded cylindrical rubber and the cylindrical rubber is held in an expanded state, is widely used as a protective member for cable and tube connection parts. Yes. This room temperature shrinkable cylindrical rubber unit uses heat because it covers the cable or tube connection and then removes the inner rigid tube, the cylindrical rubber shrinks and adheres to the cable or tube connection. Therefore, there is an advantage that the connection portion can have a watertight structure.

  As a rigid cylinder that keeps the cylindrical rubber in an expanded state, it can be easily removed after being covered with a cable connection part, etc. What was formed in is used.

  Various diameter expansion holding materials for forming a rigid cylindrical body have been proposed. An example is shown in FIG. 11 (see Patent Document 1). The expanded diameter holding member 1 is formed by integrally forming an outer peripheral meshing piece 3G on one side surface of a string-like portion 2 having a substantially rectangular cross section and an inner peripheral meshing piece 3N on the other side surface. The outer peripheral meshing piece 3G includes an outer peripheral overhanging portion 4G that protrudes laterally from the outer periphery side when spirally wound on one side surface of the string-like portion 2, and a distal end of the outer peripheral overhanging portion 4G. An inward protruding piece 5G that is bent toward the inner circumference when spirally wound from the edge, and an outer circumferential side folded portion 6G that is folded back from the tip edge of the inward protruding piece 5G toward the string-like portion 2 It consists of and. Further, the inner peripheral meshing piece 3N includes an inner peripheral projecting portion 4N projecting laterally from the inner peripheral side when the other side surface of the string-shaped portion 2 is spirally wound, The outward projecting piece 5N bent to the outer peripheral side when spirally wound from the front end edge of the side projecting portion 4N, and folded back from the front end edge of the outward projecting piece 5N toward the string-like portion 2 It is comprised from the inner periphery side folding | returning part 6N. The material of the expanded diameter holding material 1 is a hard thermoplastic, such as polypropylene or polyethylene.

  As shown in FIG. 11, if the diameter-enlargement holding member 1 is wound in a spiral shape so as to mesh the outer peripheral meshing piece 3G and the inner peripheral meshing piece 3N, a rigid cylindrical body can be formed. . In addition, as the diameter expansion holding material 1, one without the outer circumferential side folded portion 6G and the inner circumferential side folded portion 6N is also known.

  FIG. 13 shows a method for manufacturing a rigid cylinder. The expanded diameter holding member 1 is wound around a mandrel 12 that is supported by a shaft 11 at one end and rotates with a predetermined tension. The mandrel 12 has a flange 13 at the end on the shaft 11 side, and the diameter-enlarged retaining material 1 is the inner peripheral side meshing piece 3N of the diameter-enlarged retaining material 1 wound one round before the flange 13. And the newly wound outer diameter side engagement piece 3G of the expanded diameter holding member 1 is wound so as to mesh with each other. When the winding of the expanded diameter holding member 1 proceeds, the formed rigid cylinder 21 is pushed in the axial direction by the newly expanded expanded diameter holding member 1 and moves toward the release end side of the mandrel 12, and the mandrel It leaves from the open end of 12. The formed rigid cylinder 21 is cut to a required length and used as a cylindrical rubber diameter expansion holding cylinder.

  FIG. 14 shows a cold-shrinkable cylindrical shape in which a rigid cylindrical body 21A formed of the above-described expanded diameter holding material 1 is inserted into an expanded cylindrical rubber 22 and the cylindrical rubber 22 is held in an expanded state. The rubber unit 23 is shown.

  The room-temperature-shrinkable cylindrical rubber unit 23 shown in FIG. 14 passes the expanded diameter holding material 1 through the rigid cylindrical body 21 when the rigid cylindrical body 21 is disassembled and the cylindrical rubber 22 is contracted. The coil is pulled out from the winding start end α side to the winding end end β side (in the direction of arrow P). This is a normal method of pulling out in the forward direction, and the diameter-enlarged retaining material 1 is deviated in the direction of the arrow indicated by R1 in the figure.

  By the way, in the rigid cylindrical body 21A of the type in which the diameter-enlargement holding material 1 is pulled out in the forward direction, the inner peripheral side engagement piece 3N is released to the inner side, so that the engagement between the engagement pieces 3N and 3G can be easily released. it can. For this reason, when the cylindrical rubber 22 is large, when the diameter expansion holding member 1 is removed to a position in the middle of the cylindrical rubber unit 23, the mesh pieces 3N, 3G are engaged by a large contraction force of the cylindrical rubber 22. The end of the rigid cylindrical body 21A collapses in the middle of the cylindrical rubber unit 23, and the expanded diameter holding member 1 is connected to the cylindrical rubber unit 23 and the power cable. There is a tendency for an accident that is sandwiched between the adherend and the diameter maintaining member 1 not to be pulled out any more. Normally, the mesh pieces 3N and 3G are ultrasonically welded in consideration of the strength when releasing the engagement, but the weld strength of the ultrasonic welds varies, as described above. It is difficult to prevent accidents.

  In order to solve such a problem, a reverse pulling type rigid cylinder 21B shown in FIG. 15 has been proposed (see Patent Document 2).

  When the reverse pulling type rigid cylinder 21B of FIG. 15 is disassembled to shrink the cylindrical rubber 22, the expanded diameter holding member 1 is passed through the rigid cylinder 21B from the winding end end β side to the winding start end. It is drawn out to the α side (in the direction of arrow Q). This is a method of pulling out in the opposite direction to normal. When the diameter-enlarged retaining member 1 is pulled out in the reverse direction as described above, the outer peripheral side engaging piece 3G must be removed inward as shown by an arrow R2 in the figure, so that the engaging pieces 3N and 3G are disengaged. The required force increases. For this reason, even if the disassembly of the rigid cylinder 21B progresses to a position in the middle of the cylindrical rubber unit 23, an accident in which the engagement pieces 3N and 3G are rapidly disengaged due to the contraction force of the cylindrical rubber 22 is unlikely to occur.

JP 2002-112446 A Japanese Patent Laid-Open No. 11-289627

  However, in the reverse pulling type rigid cylindrical body 21B used for the large cylindrical rubber unit 23, since the diameter-enlarged holding material 1 is thick, a large force is required when extracting the diameter-enlarged holding material 1, There was a problem that it was difficult to disassemble the rigid cylinder 21B.

An object of the present invention is to be used in the rigid cylinder of reverse lookup type, providing normal temperature shrinkage tubular rubber unit that can properly manage withdrawal force.

In order to achieve this object, the cold-shrinkable cylindrical rubber unit according to the present invention is
From one side of the string-shaped part with a substantially rectangular cross-section, spirally from the outer peripheral side protruding part that protrudes laterally from the outer peripheral side when spirally wound, and from the leading edge of this outer peripheral side protruding part Forming an outer meshing piece having an inward protruding piece bent to the inner circumference side when winding,
On the other side surface of the string-like portion, spirally from the inner peripheral side protruding portion that protrudes laterally from the inner peripheral side when spirally wound, and from the leading edge of the inner peripheral side protruding portion a tubular rubber unit diameter holding member obtained by forming an inner circumferential side engagement piece having an outward protrusion which is bent to a side which becomes the outer periphery at the time of winding,
By chamfering the outer surface of the boundary portion between the inner overhanging portion of the inner peripheral side engaging piece and the outward projecting piece by providing a groove over the entire length of the expanded diameter holding member in a part of the inner peripheral side engaging piece. Accordingly, the tubular rubber unit diameter holding member which is formed by a deformed easily deformable portion a part of the inner circumferential side engagement pieces used,
The diameter-enlarged holding member is spirally wound so as to mesh the inner peripheral side engagement piece and the outer peripheral side engagement piece to form a rigid cylindrical body. To keep the cylindrical rubber in an expanded state,
The rigid cylinder has a drawing end on the winding end side of the expanded diameter holding member, and the drawing end passes through the inside of the rigid cylinder from the winding end side and is drawn to the outside from the winding start end side. it is characterized in that there.

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The diameter expansion holding material used in the present invention is provided with an easily deformable portion on the inner peripheral engagement piece, so that when the diameter expansion retention member is pulled out and the rigid cylinder is disassembled, the inner peripheral engagement piece is inclined inward. It will be in the state where an outer peripheral side engagement piece tends to remove | deviate. Thereby, the pulling-out force of the diameter expansion holding material for dismantling and removing the rigid cylinder can be lowered. Thus atmospheric temperature shrinkage tubular rubber unit Ru engaged to the invention, it becomes good mounting workability to the adherend.

[Embodiment 1] FIG. 1 shows an embodiment of a diameter expansion holding material for a cylindrical rubber unit used in the present invention. The expanded diameter holding member 1 is formed by integrally forming an outer peripheral meshing piece 3G on one side surface of a string-like portion 2 having a substantially rectangular cross section and an inner peripheral meshing piece 3N on the other side surface. The outer peripheral meshing piece 3G includes an outer peripheral overhanging portion 4G that protrudes laterally from the outer periphery side when spirally wound on one side surface of the string-like portion 2, and a distal end of the outer peripheral overhanging portion 4G. It is comprised from the inward protrusion piece 5G bent to the side used as inner periphery, when winding in a spiral shape from the edge. Further, the inner peripheral meshing piece 3N includes an inner peripheral projecting portion 4N projecting sideward from the inner peripheral side when the other side surface of the string-shaped portion 2 is spirally wound, and the inner peripheral projecting portion 4N. An outward projecting piece 5N that is bent from the front end edge of the side projecting portion 4N to the outer peripheral side when spirally wound.

  The feature of the expanded diameter holding material 1 is that an easily deformable portion 30 is provided on the inner peripheral side overhanging portion 4N. The easily deformable portion 30 is formed by providing a groove 31 having a semicircular cross section on the inner peripheral side on the string-like portion 2 side on the inner peripheral overhanging portion 4N. The groove 31 is provided over the entire length of the expanded diameter holding member 1.

  As shown in FIG. 2, if the diameter-enlarged retaining material 1 is wound in a spiral manner so as to mesh the outer peripheral meshing piece 3G and the inner peripheral meshing piece 3N, a rigid cylindrical body can be formed. .

FIG. 3 shows a cold-shrinkable cylindrical shape in which a rigid cylindrical body 21C formed of the above-described expanded diameter holding material 1 is inserted into an expanded cylindrical rubber 22 and the cylindrical rubber 22 is held in an expanded state. The rubber unit 23 is shown. This rigid cylinder 21C is of the reverse pulling type, and the winding end of the expanded diameter holding member 1 (the end of the rigid cylinder where the inner peripheral engagement piece 3N side is located ) is the extraction end 1A on the β side. The withdrawal end 1A is drawn from the end on the β side through the inside of the rigid cylinder 21C to the outside from the winding start end (the end where the outer peripheral engagement piece 3G is located ) α.

  When the expanded diameter holding member 1 has a cross-sectional shape as described above, when the rigid cylindrical body 21C is disassembled and removed by covering the cylindrical rubber unit 23 on an adherend such as a cable connection portion, the diameter of the expanded diameter holding member 1 is increased by pulling the extraction end 1A. When the holding member 1 is pulled out, the outer peripheral engagement piece 3G is detached while the inner peripheral engagement piece 3N is tilted inward. At this time, an easily deformable portion 30 is provided on the inner peripheral engagement piece 3N. Therefore, the inner peripheral meshing piece 3N easily falls inward, and the outer peripheral meshing piece 3G is easily detached.

Therefore, the expanded holding material in the case of using the rigid tubular body of the reverse lookup type, appropriately weaken it possible pull-out force of the enlarged diameter retaining member. Therefore, the cold shrink tubular rubber unit engagement Ru reverse type in the present invention, becomes good mounting workability to the adherend. If the reverse pulling type is used, it is possible to reduce dependence on unstable ultrasonic welding in order to increase the strength when disengaging the meshing pieces 3N and 3G.

[Embodiment 2] FIGS. 4 and 5 show another embodiment of the expanded diameter holding material used in the present invention. The diameter-enlargement holding material 1 is provided with a groove 31 in the middle of the outer peripheral side surface of the inner peripheral overhanging portion 4N of the inner peripheral engagement piece 3N, so that the middle portion of the inner peripheral overhanging portion 4N can be easily formed. The deforming portion 30 is used. Further, the outer peripheral meshing piece 3G of the diameter-enlargement holding member 1 has an outer peripheral folded portion 6G that is folded back from the tip edge of the inwardly projecting piece 5G toward the string-shaped portion 2, and the inner circumferential meshing piece 3N is It has an inner peripheral side folded portion 6N that is folded back from the tip edge of the outward projecting piece 5N toward the string-like portion 2. Since the configuration other than the above is the same as that of the first embodiment, the same portions are denoted by the same reference numerals and description thereof is omitted.

[Embodiment 3] FIG. 6 shows still another embodiment of the expanded diameter holding material used in the present invention. This expanded diameter holding member 1 has a groove 31 having a substantially semicircular cross section on the outer surface side of the base of the outward projecting piece 5N at the boundary between the inner peripheral projecting portion 4N of the inner peripheral engagement piece 3N and the outward projecting piece 5N. By forming the boundary portion, the boundary portion becomes the easily deformable portion 30. Since the other configuration is the same as that of the first embodiment, the same parts are denoted by the same reference numerals and the description thereof is omitted.

[Embodiment 4] FIG. 7 shows still another embodiment of the expanded diameter holding material used in the present invention. The expanded diameter holding member 1 has a groove 31 having a substantially semicircular cross section on the inner surface side of the base of the outward projecting piece 5N at the boundary between the inner peripheral projecting portion 4N of the inner peripheral engagement piece 3N and the outward projecting piece 5N. By forming the boundary portion, the boundary portion becomes the easily deformable portion 30. Since the other configuration is the same as that of the first embodiment, the same parts are denoted by the same reference numerals and the description thereof is omitted.

[Embodiment 5] FIG. 8 shows still another embodiment of the expanded diameter holding material used in the present invention. The expanded diameter holding member 1 is formed by forming a groove 31 having a substantially circular cross section on the inner surface side of the boundary portion between the inner peripheral protruding portion 4N and the outward projecting piece 5N of the inner peripheral engagement piece 3N. Is an easily deformable portion 30. Since the other configuration is the same as that of the first embodiment, the same parts are denoted by the same reference numerals and the description thereof is omitted.

[Embodiment 6] FIG. 9 shows still another embodiment of the expanded diameter holding member used in the present invention. The expanded diameter holding member 1 is formed by chamfering 32 on the outer surface of the boundary portion between the inner peripheral overhanging portion 4N of the inner peripheral engagement piece 3N and the outward projecting piece 5N, so that the boundary portion becomes the easily deformable portion 30. It is a thing. Since the other configuration is the same as that of the first embodiment, the same parts are denoted by the same reference numerals and the description thereof is omitted.

[Embodiment 6] FIG. 10 shows still another embodiment of the expanded diameter holding member used in the present invention. The enlarged diameter holding member 1 is formed with grooves 31 having a substantially semicircular cross section on the outer surface of the base portion of the inner peripheral overhanging portion 4N of the inner peripheral engagement piece 3N and the outer surface of the base portion of the outward protruding piece 5N. Thus, this portion is the easily deformable portion 30. Thus, the easily deformable part 30 may be provided at a plurality of locations. Since the configuration other than the above is the same as that of the first embodiment, the same portions are denoted by the same reference numerals and description thereof is omitted.

Sectional drawing which shows one Embodiment of the diameter expansion holding material used for this invention. Sectional drawing which shows the state which mesh | engaged the inner peripheral side meshing piece and the outer peripheral side meshing piece of the diameter expansion holding material of FIG. Half side cutaway view showing an embodiment of a normal temperature shrinkage tubular rubber unit engaged Ru in the present invention. Sectional drawing which shows other embodiment of the diameter expansion holding material used for this invention. Sectional drawing which shows the state which meshed | engaged the inner peripheral side meshing piece and the outer peripheral side meshing piece of the diameter expansion holding material of FIG. Sectional drawing which shows other embodiment of the diameter expansion holding material used for this invention. Sectional drawing which shows other embodiment of the diameter expansion holding material used for this invention. Sectional drawing which shows other embodiment of the diameter expansion holding material used for this invention. Sectional drawing which shows other embodiment of the diameter expansion holding material used for this invention. Sectional drawing which shows other embodiment of the diameter expansion holding material used for this invention. Sectional drawing which shows an example of the conventional diameter expansion holding material. Sectional drawing which shows the state which meshed | engaged the inner peripheral side meshing piece and the outer peripheral side meshing piece of the diameter expansion holding material of FIG. The manufacturing method of a rigid cylinder is shown, (A) is a front view, (B) is a top view. The half incision side view which shows an example of the normal temperature shrinkable cylindrical rubber unit using the conventional diameter expansion holding material. The half incision side view which shows the other example of the normal temperature shrinkable cylindrical rubber unit using the conventional diameter expansion holding material.

1: Expanded diameter holding material 2: String-like portion 3G: Outer peripheral side engaging piece 4G: Outer peripheral side protruding portion 5G: Inward protruding piece 6G: Outer peripheral side folded portion 3N: Inner peripheral side engaging piece 4N: Inner peripheral side protruding portion 5N : Outward projecting piece 6N: Inner circumferential folded portions 21A, 21B, 21C: Rigid cylindrical body 22: Cylindrical rubber 23: Room temperature shrinkable cylindrical rubber unit 30: Easy deformable section 31: Groove 32: Chamfer

Claims (1)

On one side surface of the string-like portion (2) having a substantially rectangular cross section, an outer peripheral side overhanging portion (4G) projecting laterally from the outer periphery side when spirally wound, and a tip of the outer peripheral side overhanging portion An outer meshing piece (3G) having an inward protruding piece (5G) bent from the edge to the inner circumference side when spirally wound is formed, and the other of the string-like part (2) is formed. When spirally wound from the inner peripheral side overhanging portion (4N) that protrudes laterally from the inner circumference side when spirally wound on the side surface, and the tip edge of the inner peripheral side protruding portion a tubular rubber unit diameter holding member obtained by forming an inner circumferential side meshing piece (3N) having an outward protrusion (5N) which is bent to the side the outer periphery,
A groove (31) is provided in a part of the inner peripheral meshing piece (3N) over the entire length of the expanded diameter holding member, or the inner projecting part (4N) of the inner peripheral meshing piece (3N) faces outward. projecting piece by chamfering (32) on the outer surface of the boundary portion (5N), the inner peripheral side meshing piece formed by a deformed easily deformable portion a part of the (3N) cylindrical rubber unit diameter holding member using the (1),
The expanded diameter holding member (1) is spirally wound so as to mesh the inner peripheral engagement piece (3N) and the outer peripheral engagement piece (3G) to form a rigid cylinder (21). The rigid cylinder (21) is inserted inside the expanded cylindrical rubber to hold the cylindrical rubber in an expanded state,
The rigid cylinder (21) has a drawing end (1A) on the winding end (β) side of the expanded diameter holding member, and the drawing end (1A) is connected to the rigid cylinder from the winding end (β) side. A room-temperature-shrinkable cylindrical rubber unit that is pulled out from the winding start end (α) side through the inside.

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