JP3751999B2 - Expanding holder for tubular members - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention holds a tubular member such as a tube end or a stress cone for processing of a terminal / connecting portion of a power cable in an expanded state, and is removed from the tubular member to release the expanded diameter after processing. The present invention relates to an enlarged diameter holder for a tubular member.
[0002]
[Prior art]
For example, as shown in FIG. 10 , the power cable terminal processing unit insulates between the connection terminal 2 connected to the terminal 1a of the power cable 1 and the rubber stress cone 3 attached to the terminal 1a. A waterproofed one, a connection terminal and a flexible tube molded integrally with a rubber member (not shown), or the like is used. In these terminal processing units, the stress cone and the tube are attached to the cable insulator while being in close contact with each other by an elastic force. Also, as a connection part, in the prefabricated connection part, the stress cone is mounted on the cable insulator and then an insulating cylinder is mounted thereon, and in the plug-in connection part, the spacer is mounted on the cable insulator, After the sleeve cover is attached to the conductor connecting pipe, an insulating cylinder is attached thereon. The outer diameter of the stress cone is slightly smaller than the cable insulator, and the inner diameter of the insulating cylinder is slightly smaller than the outer diameter of the spacer.
[0003]
Then, the pipe, the stress cone, and the spacer are mounted on the cable insulator, and in the case of the insulating cylinder, the spacer and the sleeve cover are mounted and assembled. However, since the inner diameter of each member is slightly smaller than that of the cable insulator (in the case of an insulating cylinder, slightly smaller than that of the spacer), these members are placed on the cable insulator or spacer. It is quite difficult to put on. For this reason, silicone grease or silicone oil is applied as a lubricant to the surface of the cable insulator, spacer, and sleeve cover, but installation work is performed, but the outer diameter of the cable insulator, spacer, and sleeve cover can be made with a larger tolerance. In some cases, even if a lubricant is applied, it may be difficult to mount, and workability is poor. Further, members such as stress cones have an inner diameter determined for each cable size.
[0004]
[Problems to be solved by the invention]
In order to solve such a problem, for example, there is a tool for expanding the inner diameter and inserting it into the cable in order to improve workability when attaching the stress cone, and releasing the expanded state at a predetermined position. It has been proposed (Japanese Utility Model Publication No. 5-70121).
However, this tool does not expand the stress cone evenly over the entire circumference, but expands only in one certain diameter direction and cannot expand in the other diameter direction. In addition, although the frictional force at the time of insertion into the cable will be reduced, the applicable cable is defined by the inner diameter in the direction in which the diameter cannot be expanded, and can only cope with a fixed cable size. For this reason, there exists a problem that size sharing of components cannot be aimed at.
[0005]
Further, as shown in FIG. 11, there is a hollow cylindrical body (Japanese Patent Publication No. 49-46190) that can be continuously cut into a strip shape by engraving a spiral groove 5a over the entire length of the outer peripheral surface of the hollow cylindrical body 5. Proposed. The hollow cylindrical body 5 is inserted into and closely attached to a tube 6 having rubber elasticity whose diameter is appropriately expanded. And after inserting the tube 6 to the predetermined attachment location of the cable 1, the strip | belt-shaped piece 5b continuously cut | disconnected by the helical groove | channel 5a is pulled out one by one. Thereby, the hollow cylindrical body 5 is disassembled and the tube 6 is attached to a predetermined portion of the cable 1.
[0006]
However, when the hollow cylinder 5 is disassembled and the tube 6 is attached to the cable 1, the strip 5b must be pulled out while turning the spiral strip 5b around the cable 1 in the direction of unwinding the spiral. There is a problem that it is entangled with 1 and takes time.
The present invention has been made in view of the above-described points. The tubular body formed of an elastic member is held in an expanded state, and is easily mounted by releasing the expanded state when assembled to the mounted body. An object of the present invention is to provide a diameter-enlarged holder for a tubular member.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, according to the present invention, in claim 1, an expansion is provided that is fitted over the entire length of the tubular member having an expanded elasticity and extends substantially uniformly in the circumferential direction. Tubular provided with a diameter holding part and a drawing part for pulling out the enlarged diameter holding part from the tubular member while releasing the diameter of the enlarged diameter holding part from the distal end toward the proximal end by a pulling operation in the proximal direction The member for expanding the diameter of the member, wherein the diameter-enlarged holding portion is formed of a spiral strip gradually increasing in diameter from the distal end toward the base end, and the drawing portion is separated from the diameter-enlarged holding portion. It is formed by a member, the tip is fixed to the tip of the spiral strip, and the rear end extends rearward from the base end side through the spiral strip.
[0008]
In Claim 2, the said diameter expansion holding | maintenance part is a spiral strip gradually expanding diameter toward a base end from a front-end | tip, and the said spiral strip | strip is substantially equal intervals along the circumferential direction, and is sequentially from a front-end | tip to a base end. It is formed by a plurality of flexible strips to be connected .
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to Examples 1, 2 and 3.
Example 1
1 and 2, the tubular member diameter expanding holder 10 includes a plurality of spiral strips 11 and a plurality of spiral portions (winding portions: portions divided for each pitch) of the spiral strips 11. It is composed of a flexible strip (hereinafter referred to as “string”) 12 and a plurality of pull-out, for example, two strings 13, 13, and the spiral strip 11 and the string 12 form an enlarged diameter holding portion. Thus, the strings 13 and 13 are used as the extraction portion. The spiral strip 11 has a shape in which a linear strip is spirally wound at a predetermined pitch, and the entire length of the spiral strip 11 is about the length of a tubular member that should be expanded. The spiral strip 11 is formed of a linear or belt-like metal member having elasticity, a polyolefin member such as polyethylene or polypropylene, a plastic member such as polyester or hard vinyl chloride.
[0012]
The spiral body 11 is formed by gradually increasing the diameter from the distal end 11a toward the proximal end 11b, and the inner diameter (winding diameter) of the spiral portion of each pitch is one spiral forward (front end side) spiral portion. The outer diameter (winding diameter) is substantially the same diameter or slightly larger. The winding diameter is very large compared to the outer diameter of the striate body, the winding diameter of the distal end 11a is minimum, and the winding diameter of the proximal end 11b is maximum. However, the outer diameter difference between the distal end 11a and the proximal end 11b is small because the filament is smaller (thin) than the winding diameter. And the internal diameter of this spiral strip 11a is set several times larger than the outer diameter of the predetermined location which should mount tubular members, such as a cable.
[0013]
In the spiral strip 11, the spiral portions of each pitch adjacent from the front end 11a to the rear end 11b are connected and connected by a string 12 at a plurality of places, for example, four places at equal intervals in the circumferential direction. The spiral strip 11 is held at a free length as shown in the drawing, since the spiral portions are connected by the string 12 so that elongation in the tensile direction is restricted. Then, as will be described later, when the distal end 11a is pulled toward the proximal end 11b by the string 13, the adjacent spiral portion is sequentially passed through from the distal end 11a sequentially, and finally passes through the proximal end 11b to be reversed (opposite) Orientation) possible.
[0014]
One end of each of the two cords 13 is fixed to the distal end 11 a of the spiral strip 11 at equal intervals in the circumferential direction, that is, at both end positions on the diameter, and the other end passes through the spiral strip 11 and the base end 11 b. It extends backward from the side. An annular handle 14 is fixed to the rear end of each string 13. The two strings 13, 13 are for pulling the tip 11a of the spiral strip 11 toward the rear end 11b in the state shown in the figure. Accordingly, when at least two strings 13 are provided, the balance is good. However, the present invention is not limited to this, and three or more strings 13 have the same effect. In this case, of course, it is better to fix the tip of each string to the tip 11a of the spiral strip 11 at equal intervals in the circumferential direction.
[0015]
The operation will be described below.
First, a tubular member to be expanded, for example, the stress cone 3 is expanded by an external force at a factory or the like, and the expanded diameter holder 10 is inserted into the expanded insertion hole 3a as shown in FIG. At this time, the enlarged diameter holder 10 is arranged such that the large-diameter base end 11b of the spiral state 11 is positioned on the front side in the direction of pulling out from the insertion hole 3a of the stress cone 3 (arrow direction), and the small-diameter distal end 11a is positioned on the back side. Insert into. Thereby, the diameter expansion holder 10 can hold | maintain the stress cone 3 in the state which expanded the diameter over a long period of time.
[0016]
In order to attach the stress cone 3 to the cable 1, as shown in FIG. 4, the cable 1 that has been stripped is inserted into a diameter expansion holder 10 to a predetermined position. Next, the stress cone 3 is lightly pressed and held, and the pulling strings 13 and 13 are gripped by the handles 14 and 14 and pulled in the direction of the arrow. Along with this, first, the tip 11a is pulled to move backward, and passes through the adjacent spiral portion. At this time, since the distal end 11a and the adjacent spiral portion are connected by the string 12, each spiral portion is pulled out toward the proximal end 11b while maintaining its shape concentrically. By continuing this operation, the distal end 11a is pulled out backward from the proximal end 11b, and finally all the spiral portions are pulled out from the insertion hole 3a of the stress cone 3 (FIG. 5). And the spiral strip 11 will be in the state reversed from the state shown in FIG.3 and FIG.4. The spiral state 11 is formed of an elastic member and can be easily deformed and reversed.
[0017]
Since the contact area between the spiral strip 11 and the stress cone 3 is small in the diameter expansion holder 10, the space between the inner surface of the insertion hole 3 a and the spiral strip 11 when the diameter expansion holder 10 is pulled out from the stress cone 3. The frictional force generated in the Therefore, the force required when pulling out the expanded diameter holder 10 from the stress cone 3 is small, and pulling out is easy.
[0018]
The stress cone 3 is attached to the cable 1 with a reduced diameter due to elasticity as the spiral strip 11 is pulled out from the expanded insertion hole 3a. Then, when the diameter expansion holder 10 is completely pulled out from the stress cone 3 as shown in FIG. 5, the mounting of the stress cone 3 on the cable 1 is completed. In this way, the stress cone 3 can be easily mounted on the cable 1. According to the enlarged diameter holding tool 10, the pulling operation can be completed only by the operation of pulling the pulling portion in the length direction of the mounting portion. Therefore, there is an advantage that the pulling operation is simple.
[0019]
Other tubular members such as a tubular tube, a spacer, and an insulating tube can be attached to a predetermined location such as the cable 1 by the same procedure as described above. Further, by expanding the inner diameter of each tubular member several times the outer diameter of a predetermined mounting location, a wide range of outer diameters can be obtained even if the expanded diameter holder 10 is manufactured with one outer diameter. It is possible to cope with a cable having a diameter. Therefore, the tubular member can be used over a wide range, and the size of the member can be shared.
[0020]
Further, when the long tubular member is held in an enlarged diameter, it can be easily dealt with by using a combination of two of the enlarged diameter holders 10 shown in FIG. FIG. 6 shows an example of use of the diameter expansion holder 10 in the case where a long tubular member is expanded and held. In FIG. 6, the diameter of the insertion hole 15a of the long insulating cylinder 15 is increased, and the diameter-enlarged holding tool 10 shown in FIG. At this time, it inserts so that the front-end | tips 11a of each spiral strip 11 may be opposed in the hole 15a expanded in diameter. As a result, the insulating cylinder 15 is held for a long time in an expanded state. The diameter-enlarged holding tool 10 is suitable for expanding the diameter of an insulating cylinder for a large size or a long tubular member, such as a reduction in work space.
[0021]
The connecting portions of the cables 1 and 1 are inserted into the insulation cylinder 15 that has been expanded and held, and the pull-out cords 13 and 13 of the respective expanded-diameter holders 10 are pulled out in the direction of the arrows. And when the diameter expansion holders 10 and 10 are completely pulled out from the insulating cylinder 15, the mounting of the insulating cylinder 15 onto the connection portion of the cable 1 is completed. In this way, the long insulating cylinder 15 can be easily attached.
(Example 2)
In FIG. 7, the diameter expansion holder 17 is constituted by a long cylindrical body 18 that can be expanded and contracted in the axial direction, and a plurality of, for example, two pull-out strings 20. The cylindrical body 18 is a multistage cylindrical body, and is formed by, for example, eleven thin thin cylindrical bodies 19A to 19K being sequentially fitted externally so as to be slidable in the axial direction. Each of these cylindrical bodies 19A to 19K is formed such that the inner diameter is sequentially increased from the cylindrical body 19A at the distal end 18a to the cylindrical body 19K at the proximal end 18b. The cylindrical body 19A has the smallest diameter and the cylindrical body 19K has the largest diameter. ing. And the internal diameter of the cylindrical body 18 is set several times larger than the outer diameter of the predetermined location which should mount tubular members, such as a cable.
[0022]
Locking flanges 19a to 19k are formed on the inner surfaces of the open ends of the base end sides of the cylindrical bodies 19A to 19K, respectively. When the cylindrical body 19A is stored in the cylindrical body 19B, the flange 19a is locked to the flange 19b. The same applies to the other cylindrical bodies 19B, 19C,. Thereby, when the long cylindrical body 18 is shortened to the minimum length, the cylindrical bodies 19A to 19J can be sequentially stored in the cylindrical body 19K. A locking claw may be formed instead of the flange. These cylindrical bodies 19A to 19K are formed of a plastic member such as polyolefin such as polyethylene or polypropylene, polyester, or hard vinyl chloride.
[0023]
The cylindrical bodies 19A to 19K are bonded in a state where the base ends of the cylindrical bodies sequentially accommodated as shown in the figure are drawn out to the vicinity of the open ends of the cylindrical bodies accommodated, that is, the cylindrical body 18 is stretched. Have been fixed to each other. And each cylindrical body 19A-19K is adhere | attached by the adhesive force of the grade which can peel easily (disassemble) an adhesion part when it pulls out from a tubular member later.
[0024]
The leading ends of the pulling strings 20, 20 are fixed to the inner surface of the cylindrical body 19A having the smallest diameter on the leading end 18a side of the cylindrical body 18 at equal intervals along the circumferential direction, that is, at both end positions on the diameter. Each rear end passes through the cylindrical body 18 and extends rearward from the cylindrical body 19K on the base end 18b side. An annular handle 21 is provided at the rear end of each string 20.
[0025]
In the same manner as in the first embodiment, the diameter-enlarged holding tool 17 is inserted into the insertion hole 3a of the stress cone 3 whose diameter has been expanded as shown in FIG. At this time, the diameter expanding holder 17 is inserted so that the large-diameter cylindrical body 19K of the cylindrical body 18 is positioned on the near side in the pulling direction from the stress cone 3 and the small-diameter cylindrical body 19A is positioned on the far side.
In order to attach the stress cone 3 to the cable 1, as shown in FIG. 8, the cable 1 which has been stepped off is inserted into a predetermined position into the enlarged diameter holding tool 17, and the stress cone 3 is lightly pressed and held. Then, the pulling strings 20, 20 are gripped by the handles 21, 21, and pulled in the direction of the arrow. As a result, the first cylindrical body 19A and the next cylindrical body 19B are peeled off from each other, the cylindrical body 19A is drawn into and stored in the cylindrical body 19B, and the flange 19a is locked to the flange 19b. When the cords 20 and 20 are continuously pulled, the cylindrical bodies 19B to 19J are sequentially stored in the adjacent cylindrical bodies and finally stored in the cylindrical body 19K.
[0026]
The frictional force generated between the inner surface of the insertion hole 3a and the surface of the cylindrical body 18 when the diameter expansion holder 17 is pulled out from the stress cone 3 is at least (1 / number of short cylindrical bodies (cylindrical bodies 19A, 19B,. )) Can be reduced. Therefore, the force required when pulling out the diameter expanding holder 17 from the stress cone 3 is small, and pulling out is easy. The stress cone 3 is attached to the cable 1 with a reduced diameter due to elasticity as the cylinders 19A to 19K are sequentially accommodated in the adjacent cylinders. Then, when the cylindrical body 18 is completely pulled out from the stress cone 3 as shown in FIG. 9, the mounting of the stress cone 3 onto the cable 1 is completed. According to this enlarged diameter holding tool 17, there is an advantage that the drawing operation can be completed only by an operation of pulling the drawing portion in the length direction of the mounting portion, and the drawing operation is easy.
[0027]
Other tubular members such as a tubular tube, a spacer, and an insulating tube can also be attached to a predetermined location such as the cable 1 by the same procedure as described above. Further, by expanding the inner diameter of each tubular member several times the outer diameter of a predetermined mounting location, a wide range of outer diameter holders 17 can be manufactured even if manufactured with one outer diameter. It is possible to cope with a cable having a diameter. Therefore, the tubular member can be used over a wide range, and the size of the member can be shared.
[0028]
Further, when the long tubular member is held in an enlarged diameter, the two enlarged diameter holding tools 17 shown in FIG. 7 are used in combination as in the case of the first embodiment. That is, the diameter of the long tubular member is increased, and the diameter-enlarged holding tool 17 shown in FIG. 7 is inserted from both ends of the elongated tubular member with the cylindrical bodies 19A facing each other in the expanded diameter hole. The mounting of the tubular member to the cable is the same as in the first embodiment .
[0035]
【The invention's effect】
As described above, according to the diameter expanding holder of the present invention, by disposing this inside the tubular member, for example, a tube, a stress cone, a spacer, an insulating tube, etc. to be attached to the terminal / connecting portion of the cable, etc. These can be maintained over a long period of time in an expanded state with an inner diameter that is larger than the outer diameter of the planned mounting location of a cable or the like. Also, by disassembling this, the diameter expansion state can be easily released, so that the workability in the cable terminal / connection process can be greatly improved. Furthermore, by maintaining a state in which the diameter is increased to several times the outer diameter of the predetermined mounting location, the same tubular member or the like can be used over a wide range of dimensions, and the member sizes can be shared. be able to.
[0036]
According to the second aspect, the configuration is extremely simple, and the frictional force when pulling out from the expanded tubular member is small, and the handling is easy. Further, it can be provided at a very low cost. According to this enlarged diameter holding tool, the pulling operation can be completed only by an operation of pulling the pulling portion in the length direction of the mounting portion, and there is an advantage that the pulling operation is simple.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of Embodiment 1 of a tubular member diameter expansion holder according to the present invention.
FIG. 2 is an end view of the spiral strip of FIG.
FIG. 3 is a cross-sectional view showing a use state of the diameter expansion holder of FIG. 1 and holding a tubular member in an expanded state.
FIG. 4 is an explanatory diagram when the tubular member having an enlarged diameter shown in FIG. 3 is attached to a cable.
FIG. 5 is an explanatory view showing a state where a diameter-enlarged holding tool is removed from the tubular member of FIG. 4 and attached to a cable.
6 shows another example of use of the diameter expansion holder of FIG. 1, and is an explanatory view when a long tubular member that has been expanded and held by using two diameter expansion holders is attached to a cable. FIG.
FIG. 7 is a cross-sectional view of Embodiment 2 of the diameter expanding holder according to the present invention.
FIG. 8 is an explanatory view showing an example of use of the diameter expansion holder of FIG. 8;
9 is a view showing a state in which the diameter-enlarged holding tool is removed and the tubular member is attached to the cable in FIG. 8. FIG.
FIG. 10 is an explanatory diagram of cable terminal processing.
FIG. 11 is a partially cutaway cross-sectional view of a conventional tubular member with an enlarged diameter.

Claims (2)

A diameter-enlarged holding portion that is fitted over the entire length of the tubular member having expanded diameter and holds the substantially expanded diameter in the circumferential direction;
Maintaining expansion of a tubular member having a pulling portion for pulling out the expanded diameter holding portion from the tubular member while releasing the expanded diameter of the expanded diameter holding portion from the distal end toward the proximal end by a pulling operation in the proximal direction Tools,
The diameter expansion holding portion is formed by a spiral strip gradually increasing in diameter from the distal end toward the proximal end,
The extraction portion is formed of a member separate from the enlarged diameter holding portion, the distal end is fixed to the distal end of the spiral strip, and the rear end extends rearward from the proximal end side through the spiral strip. A diameter-enlarged holder for a tubular member. The diameter expansion holding portion includes a plurality of spiral stripes that gradually increase in diameter from the distal end toward the proximal end, and a plurality of pieces that sequentially connect the spiral stripes from the distal end to the proximal end at substantially equal intervals along the circumferential direction. The diameter expansion holder for a tubular member according to claim 1, wherein the diameter expansion holder is formed of a flexible strip.

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