Non-plumber pooling and oil leakage prevention method of of cable using the same

Abstract

To provide non-plumber pooling which can prevent that oil leaks from an OF cable cut-off part in a removal operation of an OF cable.SOLUTION: Non-plumber pooling comprises: a skirt part 2 formed with a skirt cable insertion hole 2a into which an OF cable 5 with a cable conductor 5a exposed from the tip is inserted; a pooling cap part 3 attached to the front of the skirt part and is formed with an OF cable conductor insertion hole 3a into which the cable conductor is inserted; cap skirt coupling means 6 by which the pooling cap part is coupled with the skirt part; and a packing 4 formed with a packing cable conducting wire insertion hole 4a, arranged by approximately contacting an inner side of the cap skirt coupling means in a state in which the pooling cap part is coupled with the skirt part by the cap skirt coupling means, and prevents that oil flowing out from an oil passage 5b of an OF cable cut-off part leaks from a closed space between the pooling cap part and the skirt part to the outside.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present invention relates to a lead-free oil pooling that prevents oil from leaking from the cut portion of an oil-filled cable to the outside during removal of the oil-filled cable, and to a method for installing an oil-filled cable using the same. [Background technology]

[0002] Although the installation method of OF cable using a pulling eye has been known for some time, there is currently no information on the installation method of OF cable using lead-free pulling. As a related method to the installation method of OF cable using lead-free pulling, there is also known the installation method of OF cable using a pulling eye with lead connection.

[0003] In a conventional method for attaching an oil-filled cable using a pulling eye with a leadwork connection, end 103a of oil-filled cable 103 is cut, conductor 300 is exposed from end 103a of oil-filled cable 103, and the exposed conductor 300 is compression-connected to pulling eye 107. Then, pulling eye 107 is placed over seat lead part 106 from the outside, and pulling eye 107 and seat lead part 106 are connected by leadwork, thereby preventing oil leakage from the cut part of oil-filled cable 103 (for example, Patent Document 1). Here, Fig. 15 is an explanatory diagram showing the conventional method for attaching a pulling eye to a cable end, and Fig. 16 is an explanatory diagram showing the conventional attachment structure of a pulling eye. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Special Publication No. 61-32892 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the conventional method of installing an OF cable using a pulling eye, the pulling eye 107 and the seat lead work part 106 are connected by lead work, which prevents oil leakage from the cut part of the OF cable 103. However, this lead work process requires the skilled technique of the worker, and therefore, a skilled technician with advanced skills is required to install the pulling eye 107 on the OF cable 103. However, the number of such skilled technicians is decreasing year by year, and since it takes a long time to acquire the skilled skills, there has arisen a problem that it will be difficult to continue performing lead work that requires such skilled skills in the future.

[0006] The present invention has been made in consideration of the above-mentioned problems, and aims to provide a lead-free pooling that can easily and reliably prevent oil from leaking to the outside from the cut part of an OF cable during the removal work of the OF cable, and a method for preventing oil leakage from an OF cable using the same. [Means for solving the problem]

[0007] In order to solve the above problems and achieve the above objects, a first aspect of the present invention is a lead-free pooling that prevents oil from leaking to the outside from a cut portion of an OF cable during removal work of the OF cable, and includes a skirt portion having a hollow skirt cable insertion hole formed therein through which an OF cable with its conductor exposed from its tip is inserted, a pooling cap portion attached to the front of the skirt portion and having a recessed OF cable conductor insertion hole formed therein through which the cable conductor at the tip of the OF cable is inserted, cap skirt connecting means that connects the pooling cap portion and the skirt portion, and a hollow packing having a cable conductor insertion hole formed therein and configured to connect the pooling cap portion and the skirt portion by the cap skirt connecting means. The cap skirt connecting means has a gasket that is positioned in approximate contact with the inner side of the cap skirt connecting means when the ring cap portion is connected to the skirt portion, and prevents oil flowing out of the oil passage in the OF cable cutting portion from leaking out of the closed space between the pooling cap portion and the skirt portion to the outside.The cap skirt connecting means is characterized by being able to easily connect the pooling cap portion and the skirt portion, and by using the gasket to prevent oil flowing out of the oil passage in the OF cable cutting portion from leaking out of the closed space between the skirt portion and the pooling cap portion to the outside, it can easily and reliably prevent oil from leaking out of the OF cable cutting portion to the outside without the need for lead work.

[0008] According to the present invention, the cap skirt connecting means allows the pooling cap portion and the skirt portion to be easily connected, and the gasket prevents oil flowing out from the oil passage at the OF cable cutting portion from leaking out of the closed space between the pooling cap portion and the skirt portion to the outside.This makes it possible to easily and reliably prevent oil flowing out from the oil passage at the OF cable cutting portion from leaking out of the closed space between the pooling cap portion and the skirt portion to the outside during the OF cable removal work without the need for lead work.

[0009] The second aspect of the present invention is a lead-free pooling according to the first aspect, characterized in that the pooling cap portion has a chamfered outer periphery of the insertion opening of the OF cable conductor insertion hole.

[0010] According to the present invention, the outer periphery of the insertion opening of the OF cable conductor insertion hole of the pulling cap part is chamfered, so that the cable conductor of the OF cable inserted into the OF cable conductor insertion hole is guided into the OF cable conductor insertion hole along the chamfered outer periphery of the insertion opening of the OF cable conductor insertion hole, thereby making it possible to easily insert the cable conductor of the OF cable into the OF cable conductor insertion hole.

[0011] A third aspect of the present invention is a lead-free pulling ring according to the first aspect, wherein the cap-skirt connecting means has a hollow joint cable insertion hole formed therein, a gasket locking protrusion formed circumferentially to lock the gasket into the joint cable insertion hole, a female screw threaded on the inner surface of the front end, and a joint portion whose inner diameter is one size larger than the outer diameter of the rear end of the pulling cap portion and the outer diameter of the front end of the skirt portion, the pulling cap portion and the joint portion are connected by screwing together the male screw threaded on the outer surface of the rear end of the pulling cap portion and the female screw on the front inner surface of the joint portion, and the skirt portion and the joint portion are connected by inserting the front end of the skirt portion into the rear end of the joint portion and brazing the inserted skirt portion and the joint portion, and the pulling cap portion and the skirt portion are connected via the joint portion. Furthermore, before the pulling cap portion and the joint portion are screwed together, the cable conductor at the tip of the OF cable can be inserted into the OF cable conductor insertion hole while visually checking the OF cable conductor insertion hole in the pulling cap portion, so the cable conductor can be reliably inserted into the OF cable conductor insertion hole.

[0012] According to the present invention, the pooling cap portion and the joint portion are joined by threading the male screw on the outer peripheral surface of the rear end of the pooling cap portion into the female screw on the front inner peripheral surface of the joint portion, and the skirt portion and the joint portion are brazed and joined between the front end of the skirt portion and the rear end of the joint portion, so that the pooling cap portion and the skirt portion are connected via the joint portion, and therefore the pooling cap portion and the skirt portion can be easily connected.

[0013] The fourth aspect of the present invention is a lead-free metal pooling according to the first aspect, characterized in that the cap-skirt connecting means connects the pooling cap part and the skirt part by threading a male screw on the outer peripheral surface of the rear end of the pooling cap part or a female screw on the inner peripheral surface of the rear end of the pooling cap part with a female screw on the inner peripheral surface of the front end of the skirt part or a male screw on the outer peripheral surface of the front end of the skirt part.

[0014] According to the present invention, the pulling cap part and the skirt part are connected by screwing together a male screw threaded on the outer peripheral surface of the rear end of the pulling cap part or a female screw threaded on the inner peripheral surface of the rear end with a female screw threaded on the inner peripheral surface of the front end of the skirt part or a male screw threaded on the outer peripheral surface of the front end, so that the pulling cap part and the skirt part can be easily connected.

[0015] A fifth aspect of the present invention is a method for preventing oil leakage from an oil-filled cable using the lead-free pooling according to the third aspect, comprising a cable conductor exposing step of removing cable insulation around the cable conductor at the tip of the oil-filled cable to expose the cable conductor at the tip of the oil-filled cable; a skirt inserting step of inserting a front end of a skirt from a rear end of a joint cable insertion hole of a joint; a joint skirt joining step of joining the front end of the skirt inserted into the joint in the skirt inserting step and the rear end of the joint by brazing; an oil-filled cable inserting step of inserting an oil-filled cable from the rear end of the skirt cable insertion hole of the skirt joined in the joint skirt joining step, and inserting the cable conductor exposed from the tip of the oil-filled cable to the front of the joint cable insertion hole of the joint; a packing inserting step of inserting a packing from the front end of the joint cable insertion hole of the joint while inserting the cable conductor exposed from the tip of the oil-filled cable into the packing cable conductor insertion hole; a cable conductor insertion process in which, with the cable conductor exposed from the tip of the OF cable inserted into the OF cable conductor insertion hole of the pooling cap section, the cable conductor exposed from the tip of the OF cable is inserted into the OF cable conductor insertion hole of the pooling cap section; a pooling cap joint coupling process in which, with the packing inserted into the joint cable insertion hole of the joint section in the packing insertion process, the male screw threaded on the outer peripheral surface of the rear end of the pooling cap section and the female screw on the front inner peripheral surface of the joint section are screwed together, so that the packing is pressed against the rear end of the pooling cap section and pressed and locked into the packing locking protrusion, and the pooling cap section and the joint section are coupled together; a pooling cap compression process in which the outer peripheral side surface of the pooling cap section coupled to the joint section in the pooling cap joint coupling process is compressed radially inward from the outside; and a skirt section crimping process in which the outer peripheral side surface of the skirt section connected to the pooling cap section via the joint section in the pooling cap joint coupling process is crimped radially inward from the outside.

[0016] According to the present invention, the coupling part can be easily coupled to the pooling cap part by threading the male thread on the outer peripheral surface of the rear end of the pooling cap part with the female thread on the inner peripheral surface of the front of the coupling part, and the gasket prevents oil flowing from the oil passage at the OF cable cut part from leaking out of the closed space between the pooling cap part and the skirt part, thereby easily and reliably preventing oil flowing from the oil passage at the OF cable cut part from leaking out of the closed space between the pooling cap part and the skirt part during the removal of the OF cable without the need for lead work. Furthermore, because the skirt part and the pooling cap part are configured separately, the cable conductor at the tip of the OF cable can be inserted into the OF cable conductor insertion hole while visually checking the OF cable conductor insertion hole in the pooling cap part before the pooling cap part and the coupling part are screwed together. This allows the cable conductor to be reliably inserted into the OF cable conductor insertion hole and the cable conductor inserted in the pooling cap part to be reliably held by the pooling cap part, whose outer peripheral side is compressed. [Effects of the Invention]

[0017] According to the present invention, oil leakage from a cut portion of an OF cable can be easily and reliably prevented during removal of the OF cable. [Brief explanation of the drawings]

[0018] [Figure 1] FIG. 2 is a diagram showing a lead-free pooling attached to an OF cable in the first embodiment of the present invention. [Figure 2] 2(a) is a side view of the skirt portion of the lead-free purling, (b) is a front view of the skirt portion of the lead-free purling, and (c) is a cross-sectional view taken along the line AA in FIG. 2(b). [Figure 3] 3(a) is a side view of the pooling cap portion of the lead-free pooling, (b) is a front view of the pooling cap portion of the lead-free pooling, (c) is a rear view of the pooling cap portion of the lead-free pooling, and (d) is a BB cross-sectional view of FIG. 3(b). [Figure 4]1A is a front view of the packing of the lead-free pooling, and FIG. 1B is a side view of the packing of the lead-free pooling. [Figure 5] 5(a) is a side view of the joint portion of the lead-free purling, (b) is a front view of the joint portion of the lead-free purling, (c) is a cross-sectional view taken along CC in FIG. 5(b). [Figure 6] FIG. 2 is an exploded perspective view showing the lead-free metal pooling being attached to an OF cable. [Figure 7] 7(a) is a cross-sectional view showing the lead-free pipe ring attached to an OF cable, and (b) is a cross-sectional view taken along the line DD of FIG. 7(a). [Figure 8] 10 is a flowchart of a method for preventing oil leakage from an OF cable using the same lead-free pooling. [Figure 9] (a) A diagram showing the state where the metal sheath at the tip of the OF cable is exposed, (b) A diagram showing the state where the cable conductor at the tip of the OF cable is exposed, and (c) A diagram showing the state where vulcanized rubber tape is wrapped around the exposed metal sheath of the OF cable. [Figure 10] (a) A diagram showing the state where the skirt part is attached to the joint part of the lead-free pooling. (b) A diagram showing the state where the OF cable is inserted into the skirt cable insertion hole of the skirt part of the lead-free pooling and the joint cable insertion hole of the joint part. (c) A diagram showing the state where the pooling cap part and the skirt part are connected as the cable conductor exposed from the tip of the OF cable with a packing inserted is inserted into the OF cable conductor insertion hole of the pooling cap part of the lead-free pooling. [Figure 11] 1A is a diagram showing a state in which the pulley cap portion of the lead-free pulley is inserted into the pulley cap insertion hole of the compression head, and FIG. 1B is a diagram showing a state in which the skirt portion of the lead-free pulley is compressed. [Figure 12] 12(a) is a side view of the skirt portion of the lead-free purling according to the second embodiment of the present invention, (b) is a front view of the skirt portion of the lead-free purling, (c) is an E-E sectional view of FIG. [Figure 13]FIG. 2 is a cross-sectional view showing the lead-free pipe ring attached to an OF cable. [Figure 14] 10 is a flowchart of a method for preventing oil leakage from an OF cable using the same lead-free pooling. [Figure 15] FIG. 10 is an explanatory diagram showing a conventional method for attaching a pulling eye to a cable end. [Figure 16] FIG. 10 is an explanatory diagram showing a conventional mounting structure of a pulling eye. DETAILED DESCRIPTION OF THE INVENTION

[0019] The lead-free pipe and the method for preventing oil leakage from an OF cable using the same according to the present invention will be described below.

[0020] (First embodiment) Hereinafter, a lead-free purling 1 according to a first embodiment of the present invention will be described with reference to the drawings. Here, Fig. 1 is a diagram showing the lead-free purling attached to an OF cable according to the first embodiment of the present invention.

[0021] The lead-free purling 1 is used to prevent oil from leaking to the outside from the OF cable cut portion 5f (see FIG. 6) during removal of the OF cable 5, and has a skirt portion 2, a purling cap portion 3, a packing 4, and a joint portion 6. In this embodiment, the lead-free purling 1 has the skirt portion 2, the purling cap portion 3, the packing 4, and the joint portion 6, but is not limited to this. For example, as in the second embodiment, the lead-free purling 1 may not have the joint portion 6 as long as it can connect the skirt portion 2 and the purling cap portion 3. Here, FIG. 6 is an exploded perspective view showing the state in which the lead-free purling of the first embodiment of the present invention is attached to the OF cable.

[0022] Next, the skirt portion 2 of the lead-free purling 1 will be specifically described with reference to Fig. 2. Here, Fig. 2(a) is a side view of the skirt portion of the lead-free purling in the first embodiment of the present invention, Fig. 2(b) is a front view of the skirt portion of the lead-free purling, and Fig. 2(c) is a cross-sectional view taken along line AA in Fig. 2(b).

[0023] The skirt portion 2 has a hollow skirt cable insertion hole 2a formed therein through which the OF cable 5, with the cable conductor 5a exposed from the tip, is inserted (see FIGS. 2 and 6). Specifically, the skirt portion 2 has a generally cylindrical shape with a smaller diameter (outer diameter) at the tip end and a generally cylindrical shape with a slightly larger diameter (outer diameter) at the rear end. The hollow skirt cable insertion hole 2a, which communicates from the rear end to the tip end, has a generally cylindrical shape with a smaller diameter at the tip end and a generally cylindrical shape with a larger diameter at the rear end, and the OF cable 5 is inserted through the skirt cable insertion hole 2a. In this embodiment, the skirt portion 2 has a generally cylindrical shape with a larger diameter (outer diameter) at the rear end than at the tip end, but is not limited thereto. The rear end may have a generally cylindrical shape with the same diameter as the tip end.

[0024] Next, the pooling cap portion 3 of the lead-free pooling 1 will be specifically described with reference to Fig. 3. Here, Fig. 3(a) is a side view of the pooling cap portion of the lead-free pooling in the first embodiment of the present invention, Fig. 3(b) is a front view of the pooling cap portion of the lead-free pooling, Fig. 3(c) is a rear view of the pooling cap portion of the lead-free pooling, and Fig. 3(d) is a BB cross-sectional view of Fig. 3(b).

[0025] The pooling cap portion 3 is attached to the front of the skirt portion 2, and has an oil-filled cable conductor insertion hole 3a formed therein, into which a cable conductor 5a at the tip of the oil-filled cable 5 is inserted (see FIG. 3). Specifically, as will be described later, the rear end of the pooling cap portion 3 is attached to the skirt portion 2 (see FIG. 1) via a joint portion 6 (see FIG. 5). The outer peripheral surface of the front end is threaded with a male screw 3b that screws with a female screw (not shown) on the inner peripheral surface of the rear end of a pooling eye (not shown), and the outer peripheral surface of the rear end is threaded with a male screw 3c that screws with a female screw 6e of the joint portion 6. A method for connecting the pooling cap portion 3 and the skirt portion 2 using the joint portion 6 will be described later. The front end of the pooling cap portion 3 has an approximately cylindrical outer shape, and the outer diameter of the rear end of the pooling cap portion 3 is larger than the outer diameter of the front end and is approximately the same as the outer diameter of the front end of the skirt portion 2 (see FIGS. 1 and 3). The rear end of the pulling cap 3 is provided with three recessed OF cable conductor insertion holes 3a, spaced equally circumferentially from the rear end to the front end, into which the cable conductor 5a at the tip of the OF cable 5 is inserted, and the outer periphery of the insertion opening of the OF cable conductor insertion holes 3a is chamfered 3d (see FIGS. 3(c) and 3(d)). As the outer periphery of the insertion opening of the OF cable conductor insertion holes 3a is chamfered 3d, the cable conductor 5a of the OF cable 5 inserted into the OF cable conductor insertion holes 3a is guided along the chamfered 3d on the outer periphery of the insertion opening of the OF cable conductor insertion holes 3a into the OF cable conductor insertion hole 3a, thereby facilitating insertion of the cable conductor 5a of the OF cable 5 into the OF cable conductor insertion hole 3a. In this embodiment, the description will be given using the lead-free pooling 1 for an OF cable 5 (a three-core (3-wire) cable), and three recessed OF cable conductor insertion holes 3a are provided at the rear end of the pooling cap portion 3, into which the cable conductor 5a at the tip of the OF cable 5 is inserted. However, when a lead-free pooling for a single core (single cable) is used, one recessed OF cable conductor insertion hole is provided. In addition, in this embodiment, the outer diameter of the rear end of the pooling cap portion 3 is formed to be approximately the same as the outer diameter of the front end of the skirt portion 2. However, the outer diameter of the rear end may be formed to be smaller than the outer diameter of the front end of the skirt portion 2, as in the second embodiment, for example.

[0026] Next, the packing 4 of the lead-free pooling 1 will be specifically described with reference to Fig. 4. Here, Fig. 4(a) is a front view of the packing of the lead-free pooling in the first embodiment of the present invention, and Fig. 4(b) is a side view of the packing of the lead-free pooling.

[0027] The packing 4 is made of synthetic rubber and has a hollow packing cable conductor insertion hole 4a. When the pooling cap 3 is connected to the skirt 2 by the joint 6, the packing 4 is positioned in substantial contact with the inner side of the joint 6 to prevent oil from leaking from the oil passage 5b in the oil-filled cable cutting portion 5f from the enclosed space between the pooling cap 3 and the skirt 2 (see FIG. 1). The packing 4 also has a hollow packing cable conductor insertion hole 4a through which the cable conductor 5a exposed from the tip of the oil-filled cable 5 is inserted. The packing cable conductor insertion hole 4a has a substantially circular shape whose radius is smaller than the distance from the center of the oil-filled cable 5 to the oil passage 5b in the oil-filled cable 5 (see FIG. 7(b)). The outer diameter of the packing 4 is substantially the same as the inner diameter of a packing locking recess 6d in the joint 6 (described later). This will be described in detail later. In this embodiment, the packing 4 is made of synthetic rubber, but it may be made of rubber-based materials such as natural rubber, acrylic rubber, and urethane rubber. Fig. 7(a) is a cross-sectional view showing the lead-free pipe ring according to the first embodiment of the present invention attached to an OF cable, and Fig. 7(b) is a DD cross-sectional view of Fig. 7(a). Cross-sectional hatching has been omitted in Fig. 7(b) for clarity.

[0028] Next, the joint 6 of the lead-free pooling 1 will be specifically described with reference to Fig. 5. Here, Fig. 5(a) is a side view of the joint of the lead-free pooling in the first embodiment of the present invention, Fig. 5(b) is a front view of the joint of the lead-free pooling, and Fig. 5(c) is a CC cross-sectional view of Fig. 5(b).

[0029] The joint portion 6 connects the pooling cap portion 3 and the skirt portion 2, and has a hollow joint cable insertion hole 6a formed therein. A packing locking protrusion 6b for locking the packing 4 into the joint cable insertion hole 6a is formed on the circumference. A female screw 6e is threaded on the inner peripheral surface at the front end, and the inner diameter is formed to be slightly larger than the outer diameter of the rear end of the pooling cap portion 3 and the outer diameter of the front end of the skirt portion 2 (see Figures 1 and 5). Specifically, the packing locking protrusion 6b for locking the packing 4 is formed on the circumference slightly rearward of the center between the front and rear of the joint cable insertion hole 6a, and a packing locking recess 6d is formed forward of the packing locking protrusion 6b. Furthermore, a female screw 6e is threaded forward of the packing locking recess 6d, and is engaged with the male screw 3c on the outer peripheral surface at the rear end of the pooling cap portion 3. Furthermore, four hook wrench hook holes 6c are formed at equal intervals in the circumferential direction on the outer periphery of the front end of the joint portion 6. Then, hook protrusions (not shown) at the tip of a hook wrench are inserted into the hook wrench hook holes 6c of the joint portion 6, and the joint portion 6 is rotated in the circumferential direction, whereby the joint portion 6 is screwed and fixed to the pulling cap portion 3. Note that in this embodiment, four hook wrench hook holes 6c are formed at equal intervals in the circumferential direction on the front end of the joint portion 6, but this is not limiting, and the number of hook wrench hook holes 6c is not important as long as one or more hook wrench hook holes 6c are formed on the front end, and the hook wrench hook holes 6c do not have to be formed at equal intervals in the circumferential direction. Furthermore, in this embodiment, the inner diameter of the joint portion 6 is formed to be slightly larger than the outer diameter of the front end of the skirt portion 2 so that the front end of the skirt portion 2 can be inserted into the joint cable insertion hole 6a of the joint portion 6, but this is not limiting, and the outer diameter of the joint portion 6 may be formed to be smaller than the inner diameter of the front end of the skirt portion 2 so that the joint portion 6 can be inserted into the skirt cable insertion hole 2a of the skirt portion 2. In this way, when the outer diameter of the rear end of the joint portion 6 is formed to be smaller than the inner diameter of the front end of the skirt portion 2, the rear end of the joint portion 6 is inserted inside the front end of the skirt portion 2, and the rear end of the joint portion 6 and the front end of the skirt portion 2 are brazed together, thereby joining the joint portion 6 and the skirt portion 2.In addition, in this embodiment, the pooling cap portion 3 and the skirt portion 2 are connected using the joint portion 6, but this is not limited to this, and the pooling cap portion 3 and the skirt portion 2 may be connected using a cap skirt connecting means other than the joint portion 6 that connects the pooling cap portion 3 and the skirt portion 2.

[0030] Next, the procedure of the method for preventing oil leakage from an OF cable 5 using the lead-free pooling 1 according to the first embodiment of the present invention will be described with reference to Figures 6 to 11. Here, Figure 6 is an exploded perspective view showing a state in which the lead-free pooling according to the first embodiment of the present invention is attached to an OF cable, Figure 7(a) is a cross-sectional view showing the state in which the lead-free pooling is attached to the OF cable, Figure 7(b) is a DD cross-sectional view of Figure 7(a), Figure 8 is a flowchart of the method for preventing oil leakage from an OF cable using the lead-free pooling, Figure 9(a) is a view showing a state in which the metal sheath at the end of the OF cable is exposed, Figure 9(b) is a view showing a state in which the cable conductor at the end of the OF cable is exposed, Figure 9(c) is a view showing a state in which a vulcanized rubber tape is wound around the exposed metal sheath of the OF cable, and Figure 10(a) is a view showing a state in which a vulcanized rubber tape is wound around a joint portion of the lead-free pooling. Fig. 10(b) shows the state in which the skirt portion is attached, Fig. 10(b) shows the state in which the OF cable is inserted into the skirt cable insertion hole of the skirt portion of the lead-free pooling and the joint cable insertion hole of the joint portion, Fig. 10(c) shows the state in which the pooling cap portion and the skirt portion are connected as the cable conductor exposed from the end of the OF cable with a packing inserted is inserted into the OF cable conductor insertion hole of the pooling cap portion of the lead-free pooling, Fig. 11(a) shows the state in which the pooling cap portion of the lead-free pooling is inserted into the pooling cap insertion hole of the compression head, and Fig. 11(b) shows the state in which the skirt portion of the lead-free pooling is compressed. Here, cross-sectional hatching has been omitted in Fig. 7(b) for ease of viewing.

[0031] First, in S1, a cable metal sheath exposing step is carried out. In this cable metal sheath exposing step, the cable corrosion protection layer 5c at the tip of the OF cable 5 is removed to expose the metal sheath 5d at the tip of the OF cable 5 (see FIG. 9(a)). In this embodiment, 430 mm of the metal sheath 5d is exposed from the tip of the OF cable 5. The length of the exposed metal sheath 5d is determined by the cross-sectional area of ​​the OF cable 5. That is, when the cross-sectional area of ​​the OF cable 5 is 80 sq, 100 sq, or 150 sq, the metal sheath 5d is exposed for 430 mm in the longitudinal direction from the tip of the OF cable 5, when the cross-sectional area of ​​the OF cable 5 is 200 sq, 250 sq, or 325 sq, the metal sheath 5d is exposed for 450 mm in the longitudinal direction from the tip of the OF cable 5, and when the cross-sectional area of ​​the OF cable 5 is 400 sq, the metal sheath 5d is exposed for 460 mm in the longitudinal direction from the tip of the OF cable 5. That is, in this embodiment, since the OF cable 5 has a cross-sectional area of ​​100 sq, the metal sheath 5d is exposed for 430 mm in the longitudinal direction from the tip of the OF cable 5. Then, proceed to S2.

[0032] In S2, a cable conductor exposing step is performed. In this cable conductor exposing step, the cable insulator 5g around the cable conductor 5a at the tip of the OF cable 5 is removed, thereby exposing the cable conductor 5a at the tip of the OF cable 5 (see FIGS. 9(a) and 9(b)). Specifically, the metal sheath 5d, the cable insulator 5g around the cable conductor 5a, and the oil passage 5b exposed in the cable metal sheath exposing step (S1) are removed, thereby exposing the cable conductor 5a at the tip of the OF cable 5 (see FIGS. 9(a) and 9(b)). Then, the tip portions of the exposed cable conductors 5a are gathered and bundled with an iron binding wire 5e. In this way, by gathering the tip portions of the cable conductors 5a with the binding wire 5e, the tip portions of the cable conductors 5a can be bundled without falling apart. Here, in this embodiment, 190 mm of the cable conductors 5a at the tip of the OF cable 5 is exposed. The length of the exposed cable conductor 5a is determined by the cross-sectional area of ​​the OF cable 5 and is the length that reaches without slack almost to the tip of the OF cable conductor insertion hole 3a in the pooling cap portion 3. That is, when the cross-sectional area of ​​the OF cable 5 is 80 sq, 100 sq, or 150 sq, the cable conductor 5a is exposed for 190 mm in the longitudinal direction from the tip of the OF cable 5. When the cross-sectional area of ​​the OF cable 5 is 200 sq, 250 sq, or 325 sq, the cable conductor 5a is exposed for 210 mm in the longitudinal direction from the tip of the OF cable 5. When the cross-sectional area of ​​the OF cable 5 is 400 sq, the cable conductor 5a is exposed for 220 mm in the longitudinal direction from the tip of the OF cable 5. That is, in this embodiment, since the OF cable 5 has a cross-sectional area of ​​100 sq, 190 mm of the cable conductor 5a at the tip of the OF cable 5 is exposed. In this embodiment, the tip ends of the cable conductors 5a are bound with an iron binding wire 5e so that the tip ends of the cable conductors 5a are gathered together. However, this is not limited to this, and the tip ends of the cable conductors 5a may be twisted circumferentially to be bound.In this embodiment, the lead-free pooling 1 for the oil-filled cable 5 (three-core (three-wire) cable conductor) is used, and the tip of the cable conductor 5a is gathered with an iron binding wire 5e. However, when using the lead-free pooling for a single-core oil-filled cable (single-wire cable conductor), since the oil passage in the single-core oil-filled cable is arranged at the axial center of the cable conductor, the spiral (not shown) that forms the oil passage at the axial center of the cable conductor can be pulled out and an iron core (not shown) can be inserted into the oil passage from which the spiral was pulled out, thereby blocking the oil passage. For this reason, when a single-core oil-filled cable (single-wire cable conductor) is used, the packing insertion step (S4) described below can be omitted. Then, proceed to S3.

[0033] In S3, a cable rubber tape winding step is carried out. In this cable rubber tape winding step, a vulcanized rubber tape 9a is wound from above the corrugated aluminum jacket (not shown) on the outer peripheral surface of the metal sheath 5d exposed from the OF cable 5 in the cable metal sheath exposing step (S1) (see FIG. 9(c)). Specifically, the vulcanized rubber tape 9a is spirally wound over 200 mm in the longitudinal direction from the tip of the exposed metal sheath 5d so as to completely cover the outer peripheral surface of the metal sheath 5d exposed from the OF cable 5. Then, the process proceeds to S4.

[0034] In S4, a skirt portion insertion step is carried out. In this skirt portion insertion step, the front end of the skirt portion 2 is inserted from the rear end of the joint cable insertion hole 6a of the joint portion 6. Then, the process proceeds to S5.

[0035] In S5, a joint skirt joining step is carried out. In this joint skirt joining step, the front end of the skirt portion 2 inserted into the joint portion 6 in the skirt portion insertion step (S4) and the rear end of the joint portion 6 are joined by brazing (see FIG. 7(a)). In this way, the joint portion 6 and the skirt portion 2 are joined by brazing the inner peripheral surface of the rear end of the joint portion 6 and the outer peripheral surface of the front end of the skirt portion 2 inserted into the joint cable insertion hole 6a of the joint portion 6. In this embodiment, the joint portion 6 and the skirt portion 2 are joined by brazing the inner peripheral surface of the rear end of the joint portion 6 and the outer peripheral surface of the front end of the skirt portion 2, but this is not limiting. The joint portion 6 and the skirt portion 2 may also be joined by fusion joining between the inner peripheral surface of the rear end of the joint portion 6 and the outer peripheral surface of the front end of the skirt portion 2 by arc welding, laser welding, or the like. Alternatively, a female thread may be threaded on the inner peripheral surface of the rear end of the joint portion 6 or a male thread may be threaded on the outer peripheral surface of the rear end, and a male thread may be threaded on the outer peripheral surface of the front end of the skirt portion 2. When the skirt portion 2 is inserted and coupled to the rear end of the joint cable insertion hole 6a of the joint portion 6 so that a female screw is threaded on the inner peripheral surface of the joint portion 6 or the front end thereof, the female screw on the inner peripheral surface of the rear end of the joint portion 6 is threadedly engaged with the male screw on the outer peripheral surface of the front end of the skirt portion 2, and when the joint portion 6 is inserted and coupled to the front end of the skirt cable insertion hole 2a of the skirt portion 2, the joint portion 6 and the skirt portion 2 may be coupled together by threadingly engaging the male screw on the outer peripheral surface of the rear end of the joint portion 6 with the male screw on the inner peripheral surface of the front end of the skirt portion 2. Then, the process proceeds to S6.

[0036] In S6, an OF cable insertion step is carried out. In this OF cable insertion step, the OF cable 5 is inserted from the rear end of the skirt cable insertion hole 2a of the skirt portion 2 joined in the joint skirt joining step (S5), and the cable conductor 5a exposed from the tip of the OF cable 5 is inserted to the front of the joint cable insertion hole 6a of the joint portion 6 (see FIGS. 7 and 10(b)). Specifically, a skirt insertion marking tape 9b is wrapped around a position 180 mm longitudinally from the tip of the vulcanized rubber tape 9a wound in the cable rubber tape winding step (S3), and the OF cable 5 is inserted into the skirt cable insertion hole 2a of the skirt portion 2 up to the position of the skirt insertion marking tape 9b. As a result, the cable conductor 5a exposed from the tip of the OF cable 5 is inserted to the front of the joint cable insertion hole 6a of the joint portion 6. In this embodiment, the skirt portion 2 and the joint portion 6 (including the packing 4) are joined in the joint skirt joining step (S5), and the OF cable 5 is inserted into the joined skirt portion 2 and joint portion 6. However, this is not limiting, and the OF cable 5 may be inserted into the skirt cable insertion hole 2a of the skirt portion 2, and the cable conductor 5a exposed from the tip of the OF cable 5 may be inserted into the joint cable insertion hole 6a of the joint portion 6, and then the joint portion 6 and the skirt portion 2 may be joined. Then, the process proceeds to S7.

[0037] In S7, a packing insertion step is carried out. In this packing insertion step, the cable conductor 5a exposed from the tip of the OF cable 5 is inserted into the packing cable conductor insertion hole 4a, and the packing 4 is inserted from the front end of the joint cable insertion hole 6a of the joint part 6 (see FIGS. 6 and 10(c)). Specifically, while the cable conductor 5a exposed from the tip of the OF cable 5 is inserted into the packing cable conductor insertion hole 4a, the packing 4 is inserted into the joint cable insertion hole 6a from the front end of the joint cable insertion hole 6a of the joint part 6 along the inner circumferential surface of the joint part 6 (see FIGS. 7(a) and 10(a)). Here, as will be described later, the inserted packing 4 is pressed by the pulling cap part 3 inserted from the front end of the joint cable insertion hole 6a of the joint part 6 until it contacts the packing locking protrusion 6b formed on the inner circumferential surface of the joint cable insertion hole 6a, and is inserted into and locked in the packing locking recess 6d formed on the front side of the packing locking protrusion 6b (pulling cap joint joining step (S9), see FIG. 7(a)). Therefore, it is sufficient that the packing 4 inserted into the joint cable insertion hole 6a of the joint part 6 is inserted to a position forward of the packing locking protrusion 6b on the inner circumferential surface of the joint cable insertion hole 6a. Then, proceed to S8.

[0038] In S8, a cable conductor insertion step is carried out. In this cable conductor insertion step, with the OF cable 5 inserted into the skirt portion 2 and the joint portion 6, the cable conductors 5a exposed from the tip of the OF cable 5 are inserted into the OF cable conductor insertion holes 3a of the pooling cap portion 3 (see Fig. 3(d), Fig. 6, Fig. 7, and Fig. 10(c)). Specifically, the binding wire 5e that gathered and bound the tip portions of the cable conductors 5a in the cable conductor exposing step (S2) is removed from the cable conductors 5a, and the three cable conductors 5a exposed from the tip of the OF cable 5 are inserted separately into the three OF cable conductor insertion holes 3a formed behind the pooling cap portion 3 (see Fig. 10(c)). In this way, the skirt portion 2 and the pooling cap portion 3 of the lead-free pooling 1 are configured separately, so that when inserting the cable conductor 5a exposed from the tip of the OF cable 5 into the OF cable conductor insertion hole 3a of the pooling cap portion 3, the operator can insert the cable conductor 5a at the tip of the OF cable 5 into the OF cable conductor insertion hole 3a while visually checking the OF cable conductor insertion hole 3a of the pooling cap portion 3, thereby ensuring that the cable conductor 5a is inserted into the OF cable conductor insertion hole 3a without bending. This allows the cable conductor 5a to be inserted almost straight all the way to the tip of the OF cable conductor insertion hole 3a, so that the female screw 6e on the front inner peripheral surface of the joint portion 6 and the male screw 3c on the rear outer peripheral surface of the pooling cap portion 3 can be screwed together without loosening, as described below, and the joint portion 6 and the pooling cap portion 3 can be securely joined. Furthermore, since the outer periphery of the insertion opening of the OF cable conductor insertion hole 3a is chamfered 3d, the cable conductor 5a at the tip of the OF cable 5 to be inserted into the OF cable conductor insertion hole 3a is guided into the OF cable conductor insertion hole 3a along the chamfered periphery 3d of the insertion opening of the OF cable conductor insertion hole 3a, thereby making it possible to easily insert the cable conductor 5a into the OF cable conductor insertion hole 3a. Then, the process proceeds to S9.

[0039] In S9, a pulling cap joint coupling step is carried out. In this pulling cap joint coupling step, with the packing 4 inserted into the joint cable insertion hole 6a of the joint part 6 in the packing insertion step (S7), the male screw 3c threaded on the outer peripheral surface of the rear end of the pulling cap part 3 is screwed into the female screw 6e on the inner peripheral surface of the front of the joint part 6, so that the packing 4 is pressed against the rear end of the pulling cap part 3 and pressed and locked onto the packing locking protrusion 6b, and the pulling cap part 3 and the joint part 6 are coupled together (see FIGS. 7(a) and 10(c)). Specifically, with the cable conductor 5a at the tip of the OF cable 5 inserted into the OF cable conductor insertion hole 3a of the pooling cap portion 3, the hooking protrusion (not shown) at the tip of the hook wrench is inserted into the hook wrench hooking hole 6c at the front end of the joint portion 6, and the hook wrench (not shown) is rotated circumferentially around the OF cable 5, causing the joint portion 6 to rotate in the same direction, so that the female screw 6e on the front inner surface of the joint portion 6 screws into the male screw 3c on the outer surface of the rear end of the pooling cap portion 3, and the packing 4 is pressed against the rear end of the pooling cap portion 3, and with the packing 4 pressed within the joint cable insertion hole 6a of the joint portion 6, it is inserted into and engaged with the packing locking recess 6d formed on the front side of the packing locking protrusion 6b (see Figure 7(a)). In this way, when the pooling cap portion 3 is inserted into the joint cable insertion hole 6a from the front end of the joint cable insertion hole 6a of the joint portion 6, the packing 4 inserted in the packing insertion step (S7) is pressed by the pooling cap portion 3 inserted from the front end of the joint cable insertion hole 6a of the joint portion 6 until it contacts the packing locking protrusion 6b formed on the inner peripheral surface of the joint cable insertion hole 6a and is inserted into the packing locking recess 6d formed on the front side of the packing locking protrusion 6b, and the packing 4 is pressed and locked by the packing locking protrusion 6b, thereby easily and reliably preventing oil leakage from the oil passage 5b of the OF cable cut portion 5f. In this way, the female thread 6e on the front inner peripheral surface of the joint portion 6 and the male thread 3c on the outer peripheral surface of the rear end of the pooling cap portion 3 are screwed together, thereby joining the joint portion 6 and the pooling cap portion 3. Then, the process proceeds to S10.

[0040] In S10, a pooling cap compression step is performed. In this pooling cap compression step, the outer peripheral side surface of the pooling cap portion 3 coupled to the coupling portion 6 in the pooling cap coupling step (S9) is compressed radially inward from the outside (see FIG. 11(a)). Specifically, the pooling cap portion 3, into which the cable conductor 5a at the tip of the OF cable 5 is inserted, is inserted into the pooling cap insertion hole 10a (with a hexagonal compression surface) of the compression head 10. Then, hydraulic pressure sent from the compression head hydraulic pump 12 to the compression head 10 via the compression head hydraulic hose 11 compresses the outer peripheral side surface of the pooling cap portion 3 inserted into the pooling cap insertion hole 10a of the compression head 10 radially inward from the outside with a compressive force of 100 tons. Here, the pooling cap insertion hole 10a (with a hexagonal compression surface) means that the compression surface of the compression die (not shown) fitted inside the pooling cap insertion hole 10a is hexagonal. Then, the pooling cap portion 3 inserted into the pooling cap insertion hole 10a of the compression head 10 is gradually moved in the longitudinal direction of the pooling cap portion 3 within a range of 130 mm in the longitudinal direction, while the outer peripheral side surface of the pooling cap portion 3 is compressed from the outside in a radially inward direction five times. As a result, the outer peripheral side surface (130 mm in the longitudinal direction) of the pooling cap portion 3 is formed into a hexagonal shape. In this manner, the outer peripheral side surface of the pooling cap portion 3 into which the cable conductor 5a is inserted is compressed, so that the cable conductor 5a is crimped and held by the pooling cap portion 3. Note that, in this embodiment, the outer peripheral side surface of the pooling cap portion 3 is compressed with a compressive force of 100 tons, but this is not limiting, and the compressive force may be 200 tons (50 to 250 tons (preferably 100 to 200 tons)). Then, the process proceeds to S11.

[0041] In S11, a skirt portion crimping process is performed. In this skirt portion crimping process, the outer peripheral side surface of the skirt portion 2, which was connected to the pooling cap portion 3 via the joint portion 6 in the pooling cap joint connecting process (S9), is crimped radially inward from the outside (see FIG. 11(b)). Specifically, the skirt portion 2 connected to the pooling cap portion 3 is wrapped twice with the wire 13a of the crimping machine 13. Then, hydraulic pressure sent from the crimping machine hydraulic pump 15 to the crimping machine 13 via the crimping machine hydraulic hose 14 extends the jack 13b of the crimping machine 13, and the wire 13a, which has a circular cross section and is wrapped around the skirt portion 2, is pulled downward. In this way, the wire 13a is pulled downward, thereby crimping the skirt portion 2 inserted into the hollow portion of the wire 13a. After the skirt portion 2 has been crimped, the jack 13b, which has been extended by the crimping operation of the crimping machine hydraulic pump 15, is contracted to loosen the wire 13a, which has been pulled downward, thereby loosening the skirt portion 2 inserted onto the wire 13a, and the loosely fitted skirt portion 2 is inserted into the hollow portion of the wire 13a and rotated 90 degrees in the circumferential direction, after which the crimping operation by the crimping machine hydraulic pump 15 is performed again, crimping the skirt portion 2 that has been rotated 90 degrees in the circumferential direction. Then, after this crimping operation of rotating the skirt portion 2 90 degrees is performed at four locations on the top, bottom, left, and right of the circumferential direction of the skirt portion 2 (0 degree, 90 degree rotation, 180 degree rotation, 270 degree rotation), the skirt portion 2 is moved in the longitudinal direction, and the crimping operation of the skirt portion 2 (four locations (top, bottom, left, and right) in the circumferential direction of the skirt portion 2) is performed again. As a result, the crimping work of the skirt portion 2 (four locations around the circumference of the skirt portion 2) is performed at two locations in the longitudinal direction of the skirt portion 2. In this way, the skirt crimping portions 2b of the skirt portion 2 are formed at locations 70 mm and 140 mm from the tip of the vulcanized rubber tape 9a (200 mm) wound around the metal sheath 5d.

[0042] As described above, in this embodiment, the joint portion 6 and the pooling cap portion 3 are joined by screwing together the female screw 6e on the front inner peripheral surface of the joint portion 6 and the male screw 3c on the rear outer peripheral surface of the pooling cap portion 3, and the joint portion 6 and the skirt portion 2 are joined by brazing the front outer peripheral portion of the skirt portion 2 to the rear inner peripheral portion of the joint portion 6, so that the pooling cap portion 3 and the skirt portion 2 are connected via the joint portion 6, and the gasket 4 prevents oil flowing out from the oil passage 5b of the OF cable cutting portion 5f from leaking out from the closed space between the pooling cap portion 3 and the skirt portion 2, so that oil leakage from the oil passage 5b of the OF cable cutting portion 5f can be easily and reliably prevented without the need for lead work (see Figures 6 and 7). Furthermore, because the lead-free pooling 1 has the skirt portion 2 and the pooling cap portion 3 configured separately, an operator can insert the cable conductor 5a at the tip of the OF cable 5 into the OF-cable conductor insertion hole 3a while visually checking the OF-cable conductor insertion hole 3a in the pooling cap portion 3 before screwing the pooling cap portion 3 and the joint portion 6 together, thereby ensuring reliable insertion of the cable conductor 5a into the OF-cable conductor insertion hole 3a without bending the cable conductor 5a. This allows the cable conductor 5a to be inserted almost straight all the way to the tip of the OF-cable conductor insertion hole 3a, so that the female screw 6e on the front inner peripheral surface of the joint portion 6 and the male screw 3c on the rear outer peripheral surface of the pooling cap portion 3 can be screwed together without loosening, ensuring reliable coupling between the joint portion 6 and the pooling cap portion 3 and ensuring that the cable conductor 5a inserted into the pooling cap portion 3 is held reliably by the pooling cap portion 3 whose outer peripheral side is compressed.

[0043] (Second embodiment) Next, a lead-free purling according to a second embodiment of the present invention will be described with reference to Fig. 12. Here, Fig. 12(a) is a side view of the skirt portion of the lead-free purling according to the second embodiment of the present invention, Fig. 12(b) is a front view of the skirt portion of the lead-free purling, and Fig. 12(c) is an E-E cross-sectional view of Fig. 12(b).

[0044] The difference between the second embodiment and the first embodiment is that in the first embodiment, the pulling cap portion 3 and the skirt portion 2 are connected via a joint portion 6, but in the second embodiment, the female screw 16c on the inner peripheral surface of the front end of the skirt portion 16 and the male screw 3c on the outer peripheral surface of the rear end of the pulling cap portion 3 are screwed together to connect them directly. The second embodiment will be described mainly focusing on the differences from the first embodiment. Here, in the second embodiment, the same components as in the first embodiment are designated by the same reference numerals, and since they have the same functions and effects, their description will be omitted.

[0045] The skirt portion 16 has a hollow skirt cable insertion hole 16b through which the OF cable 5, with its cable conductor 5a exposed at its tip, is inserted. A packing locking protrusion 16d is formed on the inner peripheral surface of the rear end of the skirt cable insertion hole 16b, which is generally cylindrical and has a small outer diameter. A packing locking recess 16e is formed circumferentially in front of the packing locking protrusion 16d (see FIGS. 12(c) and 13). The skirt portion 16 also has a female screw 16c threaded on the inner peripheral surface of the front end to be engaged with the male screw 3c of the pulling cap portion 3. The front end of the skirt portion 16 has four hook wrench hook holes 16a equally spaced circumferentially (see FIG. 12). The other configuration of the skirt portion 16 is similar to that of the skirt portion 2 of the first embodiment, and therefore will not be described here. The pulling cap portion 3 has a male screw 3c formed on the outer peripheral surface of its rear end, similar to that of the first embodiment. In the second embodiment, four hook wrench hook holes 16a are provided at equal intervals in the circumferential direction at the front end of the skirt portion 16, but this is not limiting, and the number of hook wrench hook holes 16a is not limited as long as one or more hook wrench hook holes 16a are provided at the front end of the skirt portion 16, and the hook wrench hook holes 16a do not have to be provided at equal intervals in the circumferential direction. In addition, in the present embodiment, the hook wrench hook holes 16a are provided at the skirt portion 16, but this is not limiting, and four or one or more hook wrench hook holes 16a may be provided on the outer peripheral surface of the pulling cap portion 3.

[0046] The packing 17 is formed so that its outer diameter is approximately the same as the inner diameter of the packing locking recess 16e of the skirt portion 16. Other configurations of the packing 17 are similar to those of the packing 4 of the first embodiment, and therefore description thereof will be omitted.

[0047] Next, the procedure for connecting the skirt portion 16 and the pulley cap portion 3 in the second embodiment will be described with reference to Figures 13 and 14. Figure 13 is a cross-sectional view showing the state in which the lead-free pulley in the second embodiment of the present invention is attached to an OF cable, and Figure 14 is a flowchart of the method for preventing oil leakage from an OF cable using the lead-free pulley.

[0048] First, a cable metal sheath exposing step (S12), a cable conductor exposing step (S22), and a cable rubber tape winding step (S32) are performed. These metal sheath exposing step (S12), cable conductor exposing step (S22), and cable rubber tape winding step (S32) are similar to the metal sheath exposing step (S1), cable conductor exposing step (S2), and cable rubber tape winding step (S3) of the first embodiment, and therefore descriptions thereof will be omitted.

[0049] In S42, an OF cable insertion step is performed. In this OF cable insertion step, the cable conductor 5a exposed from the tip of the OF cable 5 is inserted and passed through the rear end of the skirt cable insertion hole 16b of the skirt portion 16. Specifically, a skirt insertion marking tape 9b is wrapped around the vulcanized rubber tape 9a wound in the cable rubber tape winding step (S32) at a position 180 mm longitudinally from the tip, and the OF cable 5 is inserted from the rear end of the skirt cable insertion hole 16b of the skirt portion 16 to the position of the skirt insertion marking tape 9b (see FIG. 13 ). Here, in the second embodiment, the skirt portion insertion step (S4), joint skirt joining step (S5), packing insertion step (S7), and OF cable insertion step (S8) of the first embodiment are not performed, and instead, the above-mentioned OF cable insertion step (S42) and a later-described packing insertion step (S52) are performed.

[0050] In S52, a packing insertion step is performed. In this packing insertion step, with the OF cable 5 inserted into the skirt portion 16, the packing 17 is inserted from the front end of the skirt cable insertion hole 16b in the skirt portion 16 along the inner circumferential surface of the skirt portion 16. Specifically, the cable conductor 5a exposed from the tip of the OF cable 5 is inserted from the rear end of the packing cable insertion hole 17a in the packing 17, and then the packing 17 with the cable conductor 5a inserted therein is inserted from the front end of the skirt cable insertion hole 16b in the skirt portion 16 along the inner circumferential surface of the skirt portion 16. Here, as will be described later, the packing 17 inserted into the skirt cable insertion hole 16b of the skirt portion 16 is pressed by the pulling cap portion 3, which screws into the female screw 16c on the inner peripheral surface of the front end of the skirt portion 16, until it contacts the packing locking protrusion 16d formed on the inner peripheral surface of the skirt cable insertion hole 16b, and is inserted into and locked in the packing locking recess 16e formed on the front side of the packing locking protrusion 16d (pulling cap skirt joining step (S72), see FIG. 13). Therefore, it is sufficient that the packing 4 inserted into the skirt cable insertion hole 16b of the skirt portion 16 is inserted to a position forward of the packing locking protrusion 16d on the inner peripheral surface of the skirt cable insertion hole 16b. Then, the process proceeds to S62.

[0051] In S62, a cable conductor insertion step is carried out. In this cable conductor insertion step, the OF cable 5 is inserted into the packing 17 and the skirt portion 16, and the cable conductor 5a exposed from the tip of the OF cable 5 is inserted into the OF cable conductor insertion hole 3a of the pulling cap portion 3. The specific details are the same as those in the cable conductor insertion step (S8) of the first embodiment, and therefore will not be described further.

[0052] In S72, a pulling cap skirt joining step is carried out. In this pulling cap skirt joining step, with the packing 17 inserted into the skirt cable insertion hole 16b of the skirt portion 16 in the packing insertion step (S52), the male screw 3c (see FIG. 3) threaded on the outer peripheral surface of the rear end of the pulling cap portion 3 and the female screw 16c (see FIG. 12) on the inner peripheral surface of the front end of the skirt portion 16 are screwed together, so that the packing 17 is pressed against the rear end of the pulling cap portion 3 and pressed and locked onto the packing locking protrusion 16d, and the pulling cap portion 3 and the skirt portion 16 are joined together (see FIG. 13). Specifically, a hook protrusion (not shown) at the tip of the hook wrench is inserted into the hook wrench hook hole 16a at the front end of the skirt portion 16, and the hook wrench (not shown) is rotated in the circumferential direction of the OF cable 5, thereby rotating the skirt portion 16 in the same direction, so that the female screw 16c on the inner peripheral surface at the front end of the skirt portion 16 is threadedly engaged with the male screw 3c on the outer peripheral surface at the rear end of the pooling cap portion 3, and the pooling cap portion 3 is connected to the skirt portion 16. As a result, when the female screw 16c on the inner peripheral surface at the front end of the skirt portion 16 is threadedly engaged with the male screw 3c on the outer peripheral surface at the rear end of the pooling cap portion 3, the packing 17 inserted into the skirt cable insertion hole 16b in the packing insertion step (S52) is pressed against the rear end of the pooling cap portion 3 that is threadedly engaged with the female screw 16c on the inner peripheral surface at the front end of the skirt portion 16, and is inserted into and locked in the packing locking recess 16e formed on the front side of the packing locking protrusion 16d (see FIG. 13). In this way, when the pooling cap portion 3 is inserted from the front end of the skirt cable insertion hole 16b of the skirt portion 16, the packing 4 inserted in the packing insertion step (S52) is pressed by the pooling cap portion 3 inserted from the front end of the skirt cable insertion hole 16b of the skirt portion 16 until it contacts the packing locking protrusion 16d formed on the inner circumferential surface of the skirt cable insertion hole 16b and is inserted into the packing locking recess 16e formed on the front side of the packing locking protrusion 16d, and the packing 4 is pressed and locked by the packing locking protrusion 16d, thereby easily and reliably preventing oil leakage from the oil passage 5b of the OF cable cut portion 5f. Then, the process proceeds to S82.Here, in the second embodiment, a pulling cap skirt connecting step (S72) is performed instead of the pulling cap joint connecting step (S9) of the first embodiment.

[0053] Next, a pooling cap compressing step (S82) and a skirt portion crimping step (S92) are performed. The pooling cap compressing step (S82) and the skirt portion crimping step (S92) are almost the same as the pooling cap compressing step (S10) and the skirt portion crimping step (S11) of the first embodiment, and can be easily understood from the first embodiment, so a description thereof will be omitted.

[0054] As described above, according to the second embodiment, the pooling cap portion 3 and the skirt portion 16 are directly connected by threading the female screw 16c on the inner peripheral surface of the front end of the skirt portion 16 with the male screw 3c on the outer peripheral surface of the rear end of the pooling cap portion 3, and the packing 17 prevents oil flowing out of the oil passage 5b of the oil-filled cable cutting portion 5f from leaking out of the closed space between the pooling cap portion 3 and the skirt portion 16, thereby easily and reliably preventing oil leakage from the oil passage 5b of the oil-filled cable cutting portion 5f without requiring lead work (see FIG. 13). Furthermore, because the pooling cap portion 3 and the skirt portion 17 are configured separately, an operator can insert the cable conductor 5a at the tip of the oil-filled cable 5 into the oil-filled cable conductor insertion hole 3a while visually checking the oil-filled cable conductor insertion hole 3a of the pooling cap portion 3, thereby ensuring reliable insertion of the cable conductor 5a into the oil-filled cable conductor insertion hole 3a without bending it. This allows the cable conductor 5a to be inserted almost straight up to the tip of the OF cable conductor insertion hole 3a, so that the male screw 3c on the outer peripheral surface of the rear end of the pooling cap portion 3 and the female screw 16c on the inner peripheral surface of the front end of the skirt portion 16 can be screwed together without loosening, allowing the pooling cap portion 3 and the skirt portion 17 to be securely joined together and the cable conductor 5a inserted into the pooling cap portion 3 to be securely held by the pooling cap portion 3 with its outer side surface compressed.

[0055] The embodiments disclosed herein should be considered to be illustrative in all respects and not restrictive. Furthermore, the scope of the present invention is defined by the claims rather than the above description, and it is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0056] 1. Lead-free pooling 2 Skirt section 2a Skirt cable insertion hole 2b Skirt tightening part 3 Pooling cap 3a OF cable conductor insertion hole 3b male screw 3c Male screw 4. Gasket 4a Packing cable conductor insertion hole 5 OF cable 5a cable conductor 5b Oil passage 5c Cable corrosion protection layer 5d metal sheath 5e binding wire 5f OF cable cut section 5g cable insulator 6 Joint 6a Joint cable insertion hole 6b Packing locking protrusion 6c Hook wrench hook hole 6d Packing locking recess 6e female screw 9a Vulcanized rubber tape 9b Skirt insertion marking tape 10 Compression Head 10a Pooling cap insertion hole 11 Compression head hydraulic hose 12 compression head hydraulic pump 13 Crimping machine 13a wire 13b Jack 14 Hydraulic hose crimping machine 15. Crimping machine hydraulic pump 16 Skirt Club 16a Hook wrench hook hole 16b Skirt cable insertion hole 16c female screw 16d Packing locking protrusion 16e Packing locking recess 17 Gasket 17a Packing cable conductor insertion hole

Claims

1. This is a lead-free pooling that prevents oil from leaking from the cut part of the OF cable to the outside during the removal work of the OF cable, a skirt portion having a hollow skirt cable insertion hole formed therein through which an OF cable having a cable conductor exposed at a tip thereof is inserted; a pooling cap portion attached to a front of the skirt portion and having a recessed oil-filled cable conductor insertion hole into which a cable conductor at a tip of the oil-filled cable is inserted; a cap skirt connecting means for connecting the pooling cap portion and the skirt portion; a packing having a hollow shape, in which a cable conductor insertion hole is formed, the packing being disposed so as to be in substantial contact with the inner side of the cap skirt connecting means when the pooling cap portion is connected to the skirt portion by the cap skirt connecting means, and preventing oil flowing out from the oil passage of the OF cable cutting portion from leaking to the outside from the closed space between the pooling cap portion and the skirt portion; The cap skirt connecting means allows the pulling cap portion and the skirt portion to be easily connected, and the gasket prevents oil flowing out of the oil passage of the OF cable cutting portion from leaking out of the closed space between the skirt portion and the pulling cap portion to the outside, thereby making it possible to easily and reliably prevent oil from leaking out of the OF cable cutting portion to the outside without the need for lead work.

2. 2. The lead-free pulley according to claim 1, wherein the pulley cap portion has a chamfered outer periphery of an insertion opening of the oil-filled cable conductor insertion hole.

3. The cap skirt connecting means is a coupling portion having a hollow joint cable insertion hole formed therein, a packing locking protrusion formed on the circumference to lock the packing in the joint cable insertion hole, a female screw threaded on the front inner peripheral surface, and an inner peripheral diameter one size larger than the outer peripheral diameter of the rear end of the pulling cap portion and the outer peripheral diameter of the front end of the skirt portion, The pulling cap portion and the joint portion are connected by threading a male screw formed on an outer peripheral surface of a rear end of the pulling cap portion into a female screw formed on an inner peripheral surface of a front end of the joint portion, the skirt portion and the joint portion are joined by inserting a front end portion of the skirt portion into a rear end portion of the joint portion and brazing the inserted skirt portion and the joint portion together, 2. The lead-free pooling according to claim 1, wherein the pooling cap portion and the skirt portion are connected via the joint portion.

4. The cap skirt connecting means is 2. The lead-free purling of claim 1, wherein the purling cap and the skirt are connected by threading a male screw on the outer peripheral surface of the rear end of the purling cap or a female screw on the inner peripheral surface of the rear end of the purling cap and a female screw on the inner peripheral surface of the front end of the skirt.

5. a cable conductor exposing step of removing cable insulation around the cable conductor at the tip of the OF cable to expose the cable conductor at the tip of the OF cable; a skirt portion insertion step of inserting a front end portion of the skirt portion from a rear end of the joint cable insertion hole of the joint portion; a joint skirt joining step in which a front end portion of the skirt portion inserted into the joint portion in the skirt portion inserting step and a rear end portion of the joint portion are joined by brazing; an OF cable insertion step in which an OF cable is inserted from the rear end of the skirt cable insertion hole of the skirt portion joined in the joint skirt joining step, and the cable conductor exposed from the front end of the OF cable is inserted to the front of the joint cable insertion hole of the joint portion; a packing insertion step of inserting the packing from a front end of the joint cable insertion hole of the joint portion while inserting the cable conductor exposed from the tip of the OF cable into the packing cable conductor insertion hole; a cable conductor insertion step of inserting the cable conductor exposed from the tip of the OF cable into the OF-cable conductor insertion hole of the pulling cap portion in a state in which the OF cable is inserted into the skirt portion and the joint portion; a pulling cap joint joining step in which, with the packing inserted into the joint cable insertion hole of the joint portion in the packing insertion step, a male screw threaded on the outer peripheral surface of the rear end of the pulling cap portion and a female screw threaded on the inner peripheral surface of the front portion of the joint portion are screwed together, so that the packing is pressed against the rear end of the pulling cap portion and pressed and locked onto the packing locking protrusion, and the pulling cap portion and the joint portion are joined together; a pooling cap compression step in which an outer peripheral side surface of the pooling cap portion coupled to the joint portion in the pooling cap joint coupling step is compressed radially inward from the outside; 4. The method for preventing oil leakage from an oil-filled cable using lead-free pulling according to claim 3, further comprising a skirt portion crimping step in which the outer peripheral side surface of the skirt portion connected to the pulling cap portion via the joint portion by the pulling cap joint connecting step is crimped radially inward from the outside.

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