JP5914078B2 - Hot line sorting tool - Google Patents

Description

  The present invention relates to a live line sorting tool that can be suitably used when performing uninterruptible work in the construction and maintenance work of electric wires.

  If switches are not installed in distribution lines, etc., power outages will be forced for a long time even if they are outside the construction section.

  In order to solve such problems, uninterruptible construction has been performed conventionally. In uninterruptible construction, the electric wires are cut on both sides of the construction section, the cut ends of the electric wires outside the construction section are connected by a bypass cable, and the live line state is maintained, and only the construction section is in a power outage state. As a tool used for such construction, a live line sorting tool for sorting and separating the cut ends is known (see, for example, Patent Document 1).

  As shown in FIG. 6, this live line sorting tool has, as a basic structure, a main body a having a cylindrical portion d, and an extendable cylindrical body b that is slidably fitted in the cylindrical portion d. It is configured. In the main body a, an FRP cylindrical portion d is connected and fixed to a main body case c made of an aluminum alloy, and bevel gears f and g whose axes are orthogonal to each other are rotatably supported in the main body case c. It is arranged in a meshed state. One end of a screw shaft h disposed on the axial center of the cylindrical portion d is fixed to the bevel gear f whose axial center coincides with the axial center of the cylindrical portion d. The other bevel gear g is fixed to one end of a rotation operation shaft j that passes through an aluminum alloy cover i that closes an opening formed on one side surface of the main body case c, and protrudes outside the rotation operation shaft j. An engagement ring k is attached to the other end for engaging and rotating a remote control tool (not shown).

  A cap 1 made of Duracon is fitted and fixed to the tip of the cylindrical portion d, and the telescopic cylinder b is slidably supported through the cap l. The telescopic cylinder b is made of FRP, and a nut member m that is screwed to the screw shaft h is fixed to one end thereof. And the expansion-contraction cylinder body b is arrange | positioned so that expansion-contraction sliding may be carried out by rotation of the screw shaft h. A key n made of ABS resin is attached to the outer peripheral surface of the telescopic cylinder body b along the axial direction, and a rotation stop of the telescopic cylinder body b is configured by a structure in which the key n engages with the cap l. Further, a cap o is fitted and fixed to the tip of the telescopic cylinder b. The main body case c and the cap o are respectively attached with hooks p and q for connecting to a chuck for gripping the distribution line.

  The chucks connected to the hooks p and q grip both sides of the part to be cut of the distribution line, and may be directly connected to the main body case c and the cap o. When the bevel gear g is rotationally driven by the remote control tool engaged with the engagement ring k in a state where the distribution line is held in this manner, a contraction operation is performed to draw the telescopic cylinder b into the cylindrical portion d. The live distribution line on both sides of the construction section can be drawn to the side between the gripping portions. Thereby, it can be stabilized in the state where slack has arisen in the distribution line of the live line state of both holding parts, maintaining the tension | tensile_strength of an outer side electric wire. As a result, even if the live distribution line is cut between the gripping portions, the tension of the distribution lines on both sides can be maintained. Cutting live distribution lines is done safely using an insulated remote cutting tool.

JP-A-8-331723

  However, when the key n is used, in order to ensure sufficient strength against rotation prevention, it is essential to firmly fix the cap l with four screws r at four places. There is a problem that man-hours increase and the cost increases. Further, since the fitting shape of the expansion / contraction cylinder body b provided with the key n on the outer periphery and the cap l in which the engagement recess with respect to the key n is formed on the end wall becomes complicated, intrusion of rainwater and the like is prevented. There is also a problem that the sealing process is difficult and it is difficult to ensure high sealing performance.

In order to solve the above-described problems, a live line sorting tool according to the present invention includes a cylindrical portion, an expansion / contraction cylindrical body fitted into the cylindrical portion so as to be extendable / slidable in the longitudinal direction from the opening end, and a cylindrical portion A nut disposed on the shaft core and fixed to the inner end side of the cylindrical portion of the telescopic cylinder, a screw shaft that is screwed to the nut, and a rotation that regulates relative axial rotation of the telescopic cylindrical body with respect to the cylindrical portion In the live line sorting tool, in which the telescopic cylinder body is elastically slidable in the longitudinal direction in a state where the telescopic cylinder is prevented from rotating when the screw shaft rotates. and inward plane formed so as to extend in the longitudinal direction and is formed so as to extend in the longitudinal direction only on the outer wall surface of the nut consists of a inward plane facing the outward plane, freely slide relative to the longitudinal direction, And at least one plane pair that restricts rotation about the axis to each other. It is characterized in that.

With this configuration, it constitutes a set of plane pairs as detent means, the inward plane formed on the inner wall surface of the cylindrical portion, and the outward plane formed only on the outer wall surface of the nut, longitudinal Is relatively slidable, but relative rotation is restricted in the direction around the axis. Thereby, when pulling an electric wire between both grips and holding the grip electric wire cut | disconnected after drawing, it can prevent that a twist arises between a cylindrical part side and an expansion-contraction cylindrical body side.

  In the above, the anti-rotation means further includes at least one set of plane pairs including an inward plane formed on the inner wall surface of the cylindrical portion and an outward plane formed on the outer surface of the nut. It is characterized by having.

  With such a configuration, it is possible to prevent rotation between the nut and the inner cylinder portion.

  In the above, the rotation preventing means further includes at least one set of an inward plane formed facing the inner diameter side on the opening end side of the cylindrical portion and an outward plane formed on the outer side surface of the telescopic cylinder. It is characterized by comprising a plane pair.

  With such a configuration, rotation prevention can be prevented between the opening end of the cylindrical portion and the telescopic cylinder.

  In the above, a cap is fitted on the opening end of the cylindrical portion, and a circular opening formed in the end wall of the cap and an outer peripheral surface having a circular cross section of the telescopic cylinder are fitted. It is characterized by that.

  With such a configuration, the cap and the expansion / contraction cylinder are independent of the rotation prevention structure and are released from the rotation prevention load, so that the opening of the end wall of the cap and the outer peripheral surface of the expansion / contraction cylinder are arranged in the circumferential direction. It can be processed into a uniform and simple shape and can be easily sealed.

  In the above, an O-ring that seals between the outer peripheral surface of the telescopic cylindrical body is further provided inside the opening edge of the cap.

With such a configuration, using a uniform fitting form in the circumferential direction between the cap and the expansion / contraction cylinder, it is possible to expand / contract simply by attaching an O-ring of a simple form to the opening edge of the cap on the fixed side. It is possible to easily seal between the outer periphery of the cylinder.

  According to the hot wire sorting tool of the present invention, it is possible to prevent twisting between the tubular portion side and the telescopic tubular body side when pulling the electric wire between both grips. It is possible to prevent the rotation and convert the rotational force into a telescopic motion without waste. Moreover, when holding the gripping electric wire that has been cut after being pulled, it is possible to prevent the ends of the cut electric wires from approaching each other and to maintain a good separation state.

  Further, since it is possible to prevent the rotation by processing the nut and the inner cylinder portion without using a special rotation prevention part, both the number of parts and the number of assembly steps are reduced, and the cost is reduced.

  In addition, it is possible to prevent rotation by processing the opening end of the cylindrical part and the telescopic cylinder without using special rotation prevention parts, so both the number of parts and assembly man-hours are reduced, and the cost is reduced. To do.

  In addition, since the cap and the telescopic cylinder can be processed in a simple shape, both the production and assembly of the parts can be simplified, and the product cost can be reduced.

  Moreover, since the O-ring can be easily attached and the space between the outer periphery of the telescopic cylinder and the cap opening edge can be satisfactorily sealed, the operation can be performed safely even in the event of rain.

It is a perspective view which shows typically the principal part of the hot wire distribution tool which concerns on the 1st Embodiment of this invention. It is a perspective view of a nut of the tool, an end view, a front view, a longitudinal section, a longitudinal section of a telescopic cylinder, and a fitted state end view of the nut and the telescopic cylinder. FIG. 2 is a perspective view, an end view, a front view, a longitudinal sectional view, a longitudinal sectional view of the telescopic cylinder, and a fitting state of the nut and the telescopic cylindrical body when the nut and the telescopic cylindrical body are in other forms. It is an end view. It is a partial sectional view showing one example of the hot-wire sorting tool according to the first embodiment of the present invention. It is a perspective view which shows typically the principal part of the hot-wire distribution tool which concerns on the 2nd Embodiment of this invention. It is a figure which shows the conventional hot wire distribution tool.

(First embodiment)
Hereinafter, the hot wire sorting tool according to the first embodiment of the present invention will be described with reference to FIGS. The following description is a specific example of the present invention and does not reduce the description of the scope of claims.

  A hot wire sorting tool 100 according to the present embodiment shown in FIG. 1 is fitted with an insulating cylindrical portion 1 and is slidably fitted in the cylindrical portion 1 so as to be extendable and slidable in the longitudinal direction from the tip (open end). Screwed into the insulating stretchable cylinder 2 and a nut 3 disposed on the axial center of the tubular portion 1 and fixed to the rear end located in the tubular portion 1 of the stretchable cylinder 2 And a pair of planes 5 serving as anti-rotation means for preventing the nut 3 from rotating with respect to the cylindrical portion 1.

  When the screw shaft 4 receives a rotation operation from the outside, the telescopic cylinder 2 is configured so as to expand and contract within the cylindrical portion 1 together with the nut 3. In particular, the plane pair 5 opposes the plane portion 51 (outward plane) obtained by scraping the cylindrical side surface of the outer periphery of the nut 3 by a width D as illustrated in FIGS. 2 (f) and 3 (f). It is composed of a flat portion 52 (inward plane) that is built up at the position from the inner wall surface of the cylindrical portion 1 to the inner diameter side by a width D.

  The number of plane pairs 5 is at least one in the circumferential direction, as in the example shown in FIGS. 1 and 2, or more, more specifically in the six examples shown in FIG. It has a function of integrating the telescopic cylinder 2 and the cylindrical portion 1 in the circumferential direction.

  Thereby, the telescopic cylinder 2 integral with the nut 3 is extended and contracted in the cylindrical portion 1 due to the screwed relationship between the screw shaft 4 and the nut 3 that receives a rotation operation from the outside, and the cylindrical portion 1 Integration is achieved by the non-rotating relationship between the nut 3 and the plane pair 5 and the shaft rotation is restricted. That is, since the nut 3 and the telescopic cylinder 2 can be prevented from rotating with respect to the rotation of the screw shaft 4, the rotational input is converted to a force in the telescopic sliding direction without waste, and an accurate telescopic function is guaranteed. .

  As described above, the telescopic sliding function can be guaranteed without using a special anti-rotation part, and both the number of parts and the number of assembly steps can be reduced, so that the cost can be suppressed.

  In addition, the rotation prevention means by the plane pair 5 (plane part 51,52) between the nut 3 and the cylindrical part 1 is the gap G formed between the cylindrical part 1 and the expansion-contraction cylinder 2 of FIG. Can be formed within a range that does not affect the fitting coupling strength between the telescopic cylinder 2 and the nut 3, the outer shape of the telescopic cylinder 2, and the like.

  Further, since the anti-rotation strength by the pair of plane pairs 5 is proportional to the size of the surface width B of the flat portions 51 and 52, if the surface width B is expanded within the allowable range for the gap G, It is possible to cope with a large detent load. However, as shown in FIG. 3, it is possible to increase the detent strength by increasing the locations where the flat portions 51 and 52 are provided.

  On the other hand, looking at the coupling strength between the nut 3 and the telescopic cylinder 2, in the example shown in FIG. 1, in order to ensure sufficient coupling strength of the nut 3 to the telescopic cylinder 2, the telescopic cylinder 2 of the nut 3. Four attachment holes 13 are provided in the fitting portion 3a. In the detailed example shown in FIG. 4, the nut 3 is connected and fixed to the telescopic cylinder 2 with a pin 23 or a screw. One end of the fitting portion 3a connected and fixed to the nut 3 is provided with a screwing portion 3b having a smaller diameter than that of the fitting portion 3a, and the screw portion 3c on the inner periphery of the screwing portion 3b is screwed to the screw shaft 4. Has been.

  In the example shown in FIG. 3, the attachment holes 13 are provided at six locations corresponding to the high-strength type detents provided with the plane pairs 5 consisting of the flat portions 51 and 52 at six locations, and the telescopic cylinder 2 is higher than the case shown in FIG.

  Next, looking at the structure in the vicinity of the opening of the cylindrical portion 1, a cap 11 is externally fitted to the opening end of the cylindrical portion 1 and attached using screws 12. The opening 11 b of the end wall 11 a of the cap 11 is formed in a circular shape so as to be fitted to the circular outer peripheral surface 2 a of the telescopic cylindrical body 2. Thus, since the cap 11 and the telescopic cylindrical body 2 are released from the anti-rotation load by being independent from the anti-rotation structure, the opening 11b and the outer peripheral surface 2a are uniform in the circumferential direction and easy to process. It can be made into a shape and a good sealing state can be formed.

As described above, since the vicinity of the opening of the cylindrical portion 1 can be formed in a circular shape, since a groove for receiving a key as in the conventional case is not formed, the strength can be ensured, and in addition to improving the sealing performance, processing is easy. Therefore, both the production and assembly of parts can be simplified and the product cost can be greatly reduced. Therefore, for example, the screw 12 of the cap 11 shown in FIG. 4 does not have to be provided in consideration of the anti-rotation action as in the configuration disclosed in Patent Document 1, and only one location is sufficient.

  In order to provide a sealing member for such a fitting structure between the opening 11b and the outer peripheral surface 2a, as shown in the detailed example of FIG. 4, the outer peripheral surface 2a of the telescopic cylinder 2 is provided at the edge of the opening 11b of the cap 11. It is preferable to provide an O-ring 14 that seals between the two. The cap 11 and the telescopic cylinder 2 can be stretched with the cap 11 by simply mounting the O-ring 14 in a simple form on the edge of the opening 11b of the cap 11 on the fixed side, using a fitting form that is uniform in the circumferential direction of the cap 11 and the telescopic cylinder 2. The space between the outer peripheral surface 2a of the cylindrical body 2 can be easily sealed, rainwater can be prevented from entering, and danger due to poor insulation can be avoided.

  When the detailed example of FIG. 4 is described in further detail, the tubular portion 1 and the telescopic tubular body 2 are both made of FRP, and repeatedly apply a resin material while winding a thread-shaped reinforcing material around a core material, Shaped to a predetermined thickness. For this reason, about the cylindrical part 1 in which a flat surface is formed in an inner wall, the core material in which the flat surface was formed in the outer surface is used. Then, after a thread-like reinforcing material is wound and the resin material is applied repeatedly to form a predetermined thickness, the planar portion appearing on the outer wall of the cylindrical portion 1 is scraped off by cutting and finished into a cylindrical shape.

  The cap 11 attached to the tip of the cylindrical part 1 is made of Duracon, and a main body case 21 made of aluminum is attached to the rear end of the cylindrical part 1 and fixed by screws 22. In the main body case 21, a bevel gear 24 disposed coaxially with and connected to the rear end of the screw shaft 4 and a bevel gear 25 in which the axis is perpendicularly engaged with the bevel gear 25 are incorporated. An engagement portion 27 that engages a remote operation tool (not shown) and receives an external rotation operation is connected and fixed to the input shaft 26 protruding from the bevel gear 25 to the outside of the main body case 21. As a result, when an external rotation operation is applied to the input shaft 26, the input shaft 26 is transmitted to the screw shaft 4 via the bevel gears 24 and 25, and the telescopic cylinder 2 can be expanded and contracted with respect to the cylindrical portion 1.

  In order to draw the live line to an appropriate interval position by contraction sliding in the expansion / contraction sliding, the front end of the expansion / contraction cylindrical body 2 and the rear end of the main body case 21 at the rear end of the cylindrical portion 1 are shown in FIG. A chuck 28 for holding a live line as shown is connected, or a connecting portion with the chuck 28 is provided. As a result, it can be used for the above-described live line sorting work.

(Second Embodiment)
Next, a hot wire sorting tool according to a second embodiment of the present invention will be described with reference to the drawings.

  FIG. 5 is a perspective view showing a live line sorting tool 200 in the present embodiment. Here, the same components as those of the live line sorting tool 100 described with reference to FIG. 1 in the first embodiment will be described with the same reference numerals.

  As shown in FIG. 5, in the live line sorting tool 200 according to the present embodiment, the nut 203 and a part of the tip of the stretchable body 202 are fitted inside the cylindrical portion 201. The nut 203 and the stretchable body 202 are integrally fixed, and the stretchable body 202 is stretched in the axial direction integrally with the nut 203 screwed onto the screw shaft 4.

  Here, the stretchable body 202 in the present embodiment is formed in a hexagonal column shape, unlike the stretchable cylinder 2 in the first embodiment. In accordance with this, the opening 211b of the cap 211 that is externally fitted to the opening end side of the cylindrical portion 201 is formed in a hexagonal shape.

Thereby, when a rotational force is transmitted from the screw shaft 4, the nut 203 and the expansion / contraction body 202 are
The rotation in the direction around the axis is restricted by a detent means comprising six surfaces forming the hexagonal opening 211b of the cap 211 and six surfaces forming the side surfaces of the stretchable body 202.

  For this reason, it is not necessary to build up the flat part 52 on the inner wall side like the cylindrical part 1 of FIG. 1, and it is not necessary to form the flat part 51 on the outer peripheral surface like the nut 3.

  Further, as in the configuration of the first embodiment, a member made of FRP is used for the stretchable body 202. For this reason, the resin material is repeatedly applied while winding the thread-shaped reinforcing material around the cylindrical core material, and after the predetermined shape and thickness are formed, six planes are cut and formed on the cylindrical side surface. The stretchable body 202 can be easily processed simply by doing so.

  That is, since the existing part can be used for the part other than the cap 211 in the cylindrical part 201 and the nut 203, the manufacturing cost can be suppressed.

  In this embodiment, the configuration in which the cross-sectional shape of the stretchable body 202 is formed in a hexagonal shape is shown as an example. However, it is sufficient that at least one plane is formed on the side wall of the stretchable body 202. Even if a polygonal shape other than a square is formed, the same effect can be obtained. In this case, an opening may be formed in the cap 211 according to the cross-sectional shape of the stretchable body 202.

  In the present embodiment, an example in which the flat portion 252 that forms the flat pair 205 with the flat portion 251 of the stretchable body 202 is formed in the opening 211b of the cap 211 has been described. If it is the inner diameter side on the end side, the plane portion 252 as an inward plane may be formed on a part of the cylindrical portion 201 other than the cap 211.

  The hot wire sorting tool of the present invention is a jumper wire between the cut ends of the non-working sections on both sides of the construction section, while allowing the distribution line in the live state to be cut off on both sides of the construction section so that the power can be cut off. It can be used for live line distribution work that is connected to and kept in a live line state to avoid power outages.

100, 200 Live line sorting tool 1,201 Cylindrical part 2 Stretchable cylinder 202 Stretchable body 3, 203 Nut 4 Screw shaft 5, 205 Plane pair (rotation prevention means)
51,251 Plane portion (outward plane)
52, 252 Plane part (inward plane)
11, 211 Cap 11a End wall 11b, 211b Opening 14 O-ring 24, 25 Bevel gear 26 Input shaft 27 Engaging portion 28 Chuck

Claims (5)

A cylindrical part, an elastic cylinder fitted into the cylindrical part so as to be extendable and slidable in the longitudinal direction from the opening end, and a cylindrical shape of the elastic cylinder disposed on the axis of the cylindrical part A nut fixed to the inner end portion side, a screw shaft that is screwed to the nut, and a detent means for restricting relative shaft rotation of the telescopic cylinder relative to the cylindrical portion,
When the screw shaft is rotated, in the live line sorting tool that extends and contracts in the longitudinal direction in the cylindrical portion in a state where the expansion and contraction cylinder is prevented from rotating,
Said detent means includes a inward plane formed so as to extend in the longitudinal direction facing the inner diameter side of the tubular portion, it is formed so as to only extend in the longitudinal direction on the outer wall surface of the nut the inward A live line sorting tool comprising a flat surface and an outward flat surface, which is configured to be relatively slidable in the longitudinal direction, and is composed of at least one pair of flat surfaces that mutually restrict rotation about an axis.   The anti-rotation means is configured by at least one pair of planes including the inward plane formed on the inner wall surface of the cylindrical portion and the outward plane formed on the outer side surface of the nut. The hot wire sorting tool according to claim 1, wherein   The detent means includes at least one set of the inward plane formed facing the inner diameter side of the cylindrical portion on the opening end side and the outward plane formed on the outer side surface of the telescopic cylinder. The hot wire sorting tool according to claim 1, wherein the live wire sorting tool is configured by a pair of planes. A cap is fitted on the opening end of the tubular portion,
The live line sorting tool according to claim 2, wherein a circular opening formed in an end wall of the cap and an outer peripheral surface having a circular cross section of the telescopic cylinder body are fitted.   The hot-wire sorting tool according to claim 4, wherein an O-ring that seals between the outer peripheral surface of the telescopic cylinder is provided inside the opening edge of the cap.