JP2012016246A - Electric wire tensioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem in that: although sag adjustment is performed by tensile force, tensile force adjustment using a winch requires too large a device, limiting a site where the adjustment can be performed; and although a conventional electric wire tensioner with a torque wrench has high mobility because of its handy configuration, an electric wire or a wire pulling the electric wire is wound repeatedly when a winding-up reel is wound up, so the torque at the point where the torque wrench folds differs from the tensile force needed for the electric wire.SOLUTION: In an electric wire tensioner in which a winding portion winding a wire rod connected to a wire grip gripping an edge of an electric wire is rotated by a torque handlebar, a span scale is formed in a setting portion of a torque in the torque handlebar and the winding portion provides the electric wire tensioner with a unchanged winding-up diameter.

Description

  The present invention relates to a wire tensioner for constructing a wire between utility poles with an appropriate slackness.

  It is necessary to construct the wire between the utility poles with an appropriate slackness in order to buffer the expansion and contraction due to temperature changes and the shaking caused by the wind. Since the sag is the slack of the electric wire, the adjustment is basically adjusted by the tension.

  A device for adjusting the sag has been proposed in the past. As shown in FIG. 5, in Patent Document 1, a tension meter 103 that senses the tension applied to the feeding end of the rope 102 that can be wound around the rope 101, and the tension measured by the tension meter 103 and the set tension. In comparison, a sag control unit 100 including a driving device 104 that rotates a drum is disclosed.

  At this time, the two sag control units 100 supporting both ends of the old ground wire move on the rail bodies installed in parallel to each other. However, the two sag control units 100 move independently on the rail bodies. The distance of 100 is slightly changed, whereby the rope 102 supporting both ends of the old ground wire is drawn out or wound up from the drum 101, but the tension meter 103 measures the tension of each rope 102 at this time, The tension is compared with the set tension, and the drum 101 is rotated by the driving device 104 to always adjust the set tension.

  Further, in Patent Document 2, as shown in FIG. 6, a wire tensioner comprising a claw 201, a ratchet wheel 202, a winding drum frame 205, and a winding drum 204 around which a wire 203 is wound, and the wire 203 is wound by a torque wrench 206. A tensioner having means for taking is disclosed. In this wire tensioner, a gripping portion that grips an electric wire is connected to a wire 203, and a torque wrench 206 winds up a winding shaft around which the wire 203 is wound.

JP-A-6-205511 Japanese Utility Model Publication No. 4-72815

  The degree of sag is determined by the law on construction for safely laying electric wires and how much it must be adjusted. The installer obtains the tension against the sag determined from the distance between the poles (diameter) and the type of electric wire to be used, and performs the overhead wire construction based on the tension.

  As disclosed in Patent Document 1, measuring the tension applied to the winding winch itself can be adjusted to an accurate tension. However, since this means requires a heavy object such as a winch and its automatic adjustment controller, a vehicle equipped with these and a power source for driving must be prepared, and the place where it can be used is limited. was there.

  Since the tension wire with a torque wrench of patent document 2 is a handy type, the mobility is high. In addition, since this wire breaker breaks when the winding lever reaches a predetermined torque, it can be easily recognized that the torque of the winding shaft becomes the set torque. However, when the hoisting reel is wound up, the electric wire or the wire that pulls the electric wire is overwrapped, and the torque at the point where the torque wrench is broken has changed from the tension required for the electric wire.

  In view of the above problems, an object of the present invention is to provide a traction tool that can be carried by an operator alone and that can adjust the sag degree accurately and easily.

Specifically, the present invention
A wire tensioner that rotates a winding portion that winds a wire connected to a wire gripper that grips an end of an electric wire with a torque handle,
A wire tensioner in which a span scale is formed at a rotational torque setting portion of the torque handle is provided.

  The wire tensioner of the present invention is characterized in that the winding diameter of the winding portion does not change.

  Moreover, the wire tensioner of the present invention is characterized in that the span scale is formed with a plurality of span scales having different sag degrees.

In addition, the tension wire of the present invention is
The wire is a meshing transmission band,
The winding unit is
A meshing pulley that holds the meshing transmission band by a predetermined angle;
A gear whose rotation center is fixed to the shaft of the meshing pulley;
An engaging claw that engages with the gear and receives an urging force from the torque handle;
It is characterized by having.

  Moreover, the wire tensioner of this invention has a corresponding electric wire confirmation means which confirms the diameter of the electric wire which uses the said span scale.

  In the tensioning device of the present invention, the mesh transmission band is held by the meshing pulley by a predetermined angle, and the electric wire is wound by the torque handle. Therefore, the winding diameter does not always change, and the torque detected by the torque handle. The wire can be pulled with a tension equivalent to. As a result, the torque adjustment with the torque handle can be converted into a span with respect to a predetermined slackness, and a tensioner capable of adjusting the slackness can be configured.

It is the top view and side view of a tensioner of the present invention. It is sectional drawing of AA of FIG. It is sectional drawing of CC of FIG. It is a figure which shows a span scale. It is a top view of the slackness control part of a prior art example. It is a top view of the wire tensioner of another conventional example.

  Fig.1 (a) is a top view of the wire tensioner 1 of this invention, FIG.1 (b) is a side view of the wire tensioner of this invention. A tensioner 1 according to the present invention is connected to a holder 2 for holding a wire gripper, a toothed belt 4 fixed to the holder 2, a winding part 5 for winding the toothed belt 4, and a winding shaft 6. Torque handle 7 is provided. As will be described later, the toothed belt 4 is a wire rod included in the “meshing transmission band” and further connected to the gripper.

  The holder 2 is substantially U-shaped, and has two anchoring members (8a, 8b) each having a through-hole formed in the bottom portion of the U-shape, and a holding plate 9 that holds the toothed belt 4. In addition, the anchoring members 8a and 8b are also formed with through-holes that coaxially penetrate both arms of the U-shaped opening. The mooring members 8 (8a, 8b) are fixed with bolts 10 together with the bottom portions of the U-shape. These may be pivotally mounted by a locking pin having a head diameter larger than that of the through hole.

  The sandwiching plates 9 are a set of upper and lower, and sandwich the end of the toothed belt 4. The holding plate 9 holding the toothed belt 4 has a through hole. The U-shaped opening side of one mooring member 8b is inserted so as to sandwich the holding plate 9 holding the toothed belt 4, and the through holes are aligned and fixed with a bolt 11. In the through hole on the other U-shaped opening side of the mooring member 8a, a locking pin or a locking bolt 12 for locking the gripping device is arranged.

  The other end of the toothed belt 4 is wound around a toothed pulley 13 (see FIG. 2) in the winding unit 5 by a predetermined angle. FIG. 2 shows a cross section taken along the line AA of FIG. The winding unit 5 includes a housing 50 and a winding shaft 6 pivotally supported at a substantially central portion of the housing 50. A toothed pulley 13 is inserted and fixed to the winding shaft 6. When the winding shaft 6 is rotated from the outside, the toothed pulley 13 also rotates. As will be described later, the toothed pulley 13 is included in the “meshing pulley”.

  The toothed belt 13 is wound around the toothed pulley 13 at an angle of approximately 200 degrees so that the respective teeth are fitted. Guide pulleys (51 to 55) for guiding the toothed belt 4 are arranged around the toothed pulley 13, and the toothed belt 4 wound from the winding port 58 is fitted to the toothed pulley 13. After being wound, it is unwound from the unwinding port 59.

  A fixed holder 14 is fixed to the rear portion of the housing 50. The fixing holder 14 is used when fixing the wire tensioner 1 of the present invention to a utility pole or the like. For example, a wire wound around a utility pole is locked to the fixed holder 14.

  Returning to FIG. 1, the winding shaft 6 extends outside the casing 50 of the winding portion 5, and the torque handle 7 is connected to the winding shaft 6 via a ratchet portion 19. The torque handle 7 includes a lever portion 16, a scale portion 17, and a span adjustment knob 28. The scale portion 17 and the span adjustment knob 28 constitute a rotational torque setting portion of the torque handle 7.

  In FIG. 3, the cross section between CC which is a cross section of a ratchet structure and a torque lever is shown. The ratchet portion 19 is provided with a gear 21 housed in the ratchet body 20 and fixed to the take-up shaft 6, and an engaging claw portion 22 pivotally supported by the ratchet body 20. The engaging claw portion 22 has a claw 23 that engages with the gear 21 and a protrusion 24 that abuts on the tip portion 15 of the torque handle 7.

  The torque handle 7 includes a tip end 15 that contacts the protrusion 24 of the engaging claw portion 22 of the ratchet portion 19, a spring 25 that biases the tip end 15 disposed inside the torque handle 7 body, a spring 25, and the tip end 15. A toggle 26 disposed between the adjusting screw 18, an adjusting screw 18 for adjusting the urging force of the spring 25, a slider 27 screwed into the adjusting screw 18, and a diameter that is rotationally coupled to the other end of the main body and fixes the adjusting screw 18. An intermediate adjustment knob 28 is provided.

  FIG. 4 shows the scale portion 17 of the torque handle 7. The scale portion 17 has a part of the main body of the torque handle 7 cut away so that the adjustment screw 18 in the main body can be seen directly. An instruction mark 30 is formed on a part of the slider 27 screwed to the adjustment screw 18. And the span scale 31 is shown by the distance in the thick part of the excised torque handle 7 main body. In FIG. 4, a span scale 31 is formed for two types of sag, sag 1.5% (32) and 2% (33).

  The span scale 31 is used when the tension wire 13 is pulled by the toothed pulley 13 to obtain a predetermined sag when the wire of the thickness intended by the wire tensioner 1 is wired between the predetermined diameters. It is formed based on the displacement torque of the torque handle 7.

More specifically,
The following relationship is established among the tension T (kgf), the unit weight W (kg / m) of the wire, the span S (m), and the sag D (%).
T = (WS / 8D) · 100 (1)
Further, in the wire tensioner, the following relationship is established between the torque Mt (kgf · m) and the pulley diameter r (m).
Mt = T · r (2)
Therefore, from the above-described equations (1) and (2),
The torque value for tightening the wire tensioner for the wire to have a desired slackness between the predetermined diameters is determined as follows.
Mt = (WS / 8D) · 100 · r
Here, the unit weight W of the wire is a value determined by the thickness of the electric wire to be used, and the sag D (%) is also determined. The diameter of the toothed pulley 13 is known by the creator of the wire tensioner 1 of the present invention. As a result, the torque Mt for a predetermined sag can be obtained as a function of the span S and can be embodied as a scale as shown in FIG.

  In other words, instead of displaying the normal torque (N · m), the span scale can be displayed on the rotational torque setting portion of the torque handle. Here, since adjustment of the sag has a width of several percent, a span scale for a plurality of sags may be formed in one tensioner. For example, in FIG. 4, a span scale 31 is formed with a sag of 1.5% and 2%.

  Referring again to FIG. 1, the corresponding electric wire confirmation means 40 is provided in a portion other than the scale portion 17 of the torque handle 7. As in the above equation, the unit weight W of the wire is an independent variable with respect to the torque Mt. Therefore, it is necessary to include this value in the scale formed in the scale portion 17. However, the unit weight of the wire varies greatly depending on its thickness, and it is difficult to handle all types of electric wires with a single wire tensioner.

  Therefore, it is desirable that the wire tensioner 1 capable of adjusting the slackness of the present invention has the corresponding electric wire confirmation means 40 capable of confirming the thickness of the electric wire that can be used. Corresponding electric wire confirmation means 40 is corresponding electric wire confirmation means 40 in which the thickness of the electric wire that can be used by this wire drawing device 1 is indicated by a black line. In other words, it shows that the wire tensioner 1 cannot be used for an electric wire having a diameter different from that of the black wire. In addition, the corresponding electric wire confirmation means 40 shown here is an example, Comprising: Another method may be sufficient.

  Next, one usage method of the wire tensioner 1 of this invention is demonstrated. Since the tensioner 1 of the present invention is a handy type, an operator can carry it around. What is confirmed in advance is the thickness (standard) of the electric wire to be adjusted from now on and the span distance between the utility poles on which the electric wire to be adjusted is wired. Therefore, the operator checks the standard of the electric wire to be adjusted in advance, holds the corresponding wire tensioner 1 of the present invention, and checks the thickness of the electric wire with the corresponding electric wire checking means 40 on site. Next, the distance between the wires to be adjusted is measured. Also, check the wire sag to be set beforehand (from construction standards, etc.).

  Next, an operator climbs the electric pole which is not fixed to the electric wire to be adjusted, and fixes the wire tensioner 1 of the present invention to the electric pole. As described above, the fixing method involves winding a wire around a utility pole and locking one end of the wire to a fixing holder 14 at the rear portion of the wire tensioner 1.

  In addition, the operator holds the other end of the electric wire with a separately prepared grasping device and locks the grasping device to the holder 2 of the wire drawing device 1. Thus, the wire tensioner 1 fixed with a wire is interposed between the end of the electric wire and the utility pole. Here, the span adjustment knob 28 of the wire tensioner 1 is turned so that the indication mark 30 of the slider 27 of the scale unit 17 is adjusted to the span scale 31. The display of the span scale 31 is selected from the set wire sag.

  In this state, the operator operates the torque handle 7. When the torque handle 7 is operated, the winding shaft 6 rotates via the ratchet portion 19, and the toothed pulley 13 winds the toothed belt 4 accordingly. The electric wire connected to the tip of the toothed belt 4 is also drawn toward the wire tension device 1.

  As shown in FIG. 3, in the ratchet portion 19, the engaging claw portion 22 locks the gear 21. When the tip 15 of the torque handle 7 is locked by the protrusion 24 of the engaging claw 22, the rotational force of the torque handle 7 is locked by the claw 23 of the engaging claw 22. Rotate. Here, since the tip end portion 15 of the torque handle 7 is biased by the spring 25 via the toggle 26, the rotational force can be applied to the protrusion 24 of the engaging claw portion 22 up to a predetermined rotational force.

  However, when a force greater than the force urged by the spring 25 is applied from the tip portion 15, the toggle 26 rotates and moves to another position, and the torque handle 7 is broken, so that a predetermined torque is applied. Recognized by workers.

  In this manner, the toothed pulley 13 is rotated by the operator's operation of the torque handle 7, and the toothed pulley 13 feeds the toothed belt 4 that has been hand-drawn by the amount that has been hand-drawn from the unwinding port 59. Therefore, no matter how much winding, the winding diameter determined by the diameter of the toothed pulley 13 does not change, and the relationship of the formula (2) is always maintained.

  When the electric wire has a predetermined slackness, the winding torque becomes the value set by the torque handle 7 as described above, and the gear 21 of the ratchet portion 19 is engaged while the tip portion 15 of the torque handle 7 is engaged with the protrusion. It cannot be turned and breaks at the toggle 26. At this point, it can be seen that the electric wire pulled by the toothed pulley 13 is suspended with a tension corresponding to a predetermined slackness.

  As described above, the wire tensioner 1 of the present invention winds the toothed belt 4 with the toothed pulley 13, so that the winding diameter does not change when winding the electric wire. Therefore, a tension corresponding to a desired sag can be applied to the electric wire with a torque for rotating the toothed pulley 13 of the wire tensioner 1. As a result, since the sag to be adjusted is determined by a rule, the tensioner 1 capable of adjusting the sag can be configured with the scale of the torque handle 7 as the span.

  In the present invention, the toothed belt 4 and the toothed pulley 13 are used for the winding unit 5, but the belt is limited to the toothed belt and the toothed pulley as long as the belt can be wound at a predetermined hugging angle. It is not a thing. For example, instead of a toothed belt and a toothed pulley, a combination of a chain and a gear may be used, or a combination of a timing belt and a timing pulley may be used. Therefore, the toothed belt of the present invention can be said to be a “meshing transmission band” including a chain, a timing belt, and the like. The toothed pulley can be said to be a “meshing pulley” including a gear, a timing pulley, and the like.

  The present invention is useful for a towing tool for constructing a wire between utility poles with an appropriate slackness.

DESCRIPTION OF SYMBOLS 1 Wire tensioner 2 Holder 4 Toothed belt 5 Winding part 6 Winding shaft 7 Torque handle 8 (8a, 8b) Mooring member
9 Nipping plate 10, 11 bolt 12 locking bolt 13 toothed pulley 14 fixed holder 15 tip 16 lever 17 scale 18 adjustment screw 19 ratchet 20 ratchet body 21 gear 22 engaging claw 23 claw 24 protrusion 25 Spring 26 Toggle 27 Slider 28 Spacing adjustment knob 30 Instruction mark 31 Spacing scale 40 Corresponding electric wire confirmation means 50 Housing 51 to 55 Guide pulley 58 Winding port 59 Unwinding port 100 Sag control unit 101 Drum 102 Rope 103 Tensiometer 104 Driving device 201 Claw 202 Ratchet wheel 203 Wire 204 Winding drum 205 Winding drum frame 206 Torque wrench

Claims (5)

A wire tensioner that rotates a winding portion that winds a wire connected to a wire gripper that grips an end of an electric wire with a torque handle,
A wire tensioner in which a span scale is formed at a rotational torque setting portion of the torque handle.   The wire spanning device according to claim 1, wherein the span scale has a plurality of span scales having different sag degrees.   The wire tensioner according to claim 1, wherein the winding portion has a winding diameter that does not change. The wire is a meshing transmission band,
The winding unit is
A meshing pulley that holds the meshing transmission band by a predetermined angle;
A gear whose rotation center is fixed to the shaft of the meshing pulley;
An engaging claw that engages with the gear and receives an urging force from the torque handle;
The wire tensioner according to claim 1, comprising:   The wire tensioner according to any one of claims 1 to 4, further comprising a corresponding electric wire confirmation means for confirming a diameter of an electric wire using the span scale.