AU2013403576A1 - Wire tensioner - Google Patents

Abstract

Provided is a wire tensioner with which the tensioning of aerial wires and the like can be performed safely and quickly. This wire tensioner (1) is equipped with: a tensioner main body section (2); a first attachment section (5); a pulling section (6) for connecting the tensioner main body section (2) and the first attachment section (5); a rotary drive mechanism (3), which is embedded in the tensioner main body section (2), and operates so as to take up the pulling section (6) into the interior of the tensioner main body section (2), thereby drawing the first attachment section (5) toward the tensioner main body section (2); a drive source (7) having an electric motor that supplies driving force to the rotary drive mechanism (3); a brake mechanism (4), which is embedded in the tensioner main body section (2) and engages the rotary drive mechanism (3); a second attachment section (8) provided on the tensioner main body section (2); a transmitter (9) for wirelessly controlling the electric motor of the drive source (7); a receiver (10) for receiving signals transmitted from the transmitter (9); and a battery (11) for supplying power to the drive source (7). The rotary drive mechanism (3) is rotationally driven primarily by the driving force of the electric motor of the drive source (7).

Description

SPECIFICATION

TITLE OF THE INVENTION: WIRE TENSIONER

Field of the Invention [0001]

The present invention relates to a wire tensioner, and in particular, to such a wire tensioner in which, for example, in wiring work or the like, by stretching a free end of an overhead wire or the like in the horizontal direction or lateral direction, the overhead wire or the like can be held on an electric pole.

Description of the Related Art [0002]

As a conventional wire stretcher, a wire stretcher described in Patent Document 1 has been known. As shown in FIG. 18, this wire stretcher 1001 is constituted by a wire stretcher main body 1002, a wire gripper attaching unit 1003 for use in attaching a wire gripper 1008, a wire 1004 for coupling the wire stretcher main body 1002 and the wire gripper attaching unit 1003 to each other, a ratchet handle 1005 and a base attaching unit 1006 that is attached to a supporting base of an electric pole C or the like.

[0003]

In the case when an overhead wire is stretched and installed between electric poles or the like by using the wire stretcher 1001, first, by fixing a butt wire 1009 attached to the base attaching unit 1006 to the electric pole C, the wire stretcher 1001 is supported on the electric pole C. Next, with the wire 1004 drawn from the wire stretcher main body 1002, a free end 1007a of an overhead wire 1007 is gripped by the wire gripper 1008 attached to the wire gripper attaching unit 1003. Moreover, the ratchet handle 1005 is manually operated so that the wire 1004 is wound up into the wire stretcher main body 1002; thus, the free end 1007a of the overhead wire 1007 is stretched toward the electric pole C side, and held thereon.

[0004]

Moreover, in a manner different from the wire stretcher 1 described in Patent Document 1, in some cases, the overhead wire is stretched and installed between electric poles, or the like, by using a winch or the like.

Prior Art Documents Patent Documents [0005]

Patent Document 1: JP-A No. 11-103513

SUMMARY OF THE INVENTION

PROBLEMS TO BE SOLVED BY THE INVENTION

[0006]

However, in the wire stretcher 1001 described in Patent Document 1, in order to wind up the wire 1004 into the wire stretcher main body 1002, the ratchet handle 1005 needs to be manually operated near the wire stretcher 1001. Consequently, if the gripping state between the overhead wire 1007 and the wire gripper 1008 falls off at the time of a winding process of the wire 1004, the wire gripper 1008 might come flying in an unexpected direction.

[0007]

In the case when the overhead wire is stretched and installed between electric poles or the like by using a winch or the like, it has been impossible to carry out a quick wiring work because of a heavy winch weight, a slow rotation speed, or the like.

[0008]

Moreover, in the wiring work of the overhead wire by the winch, since the overhead wire is subjected to a so-called "vertically hanging up operation", the safety rate is set in a high level. In the wiring work of the overhead wire by the wire stretcher 1001 described in Patent Document 1 in which the overhead wire is subjected to a so-called "laterally hanging up operation", the safety rate is set in a level lower than that in the case of the "vertically hanging up operation".

[0009]

Therefore, the object of the present, invention is to provide a wire tensioner that can carry out a wiring work of an overhead wire or the like safely and quickly.

MEANS TO SOLVE THE PROBLEMS

[0010]

In accordance with claim 1, the present invention relates to a wire tensioner comprising: a wire stretcher main body; a first attaching unit; a traction unit for coupling the wire stretcher main body and the first attaching unit to each other; a rotation driving mechanism that is integrally installed in the wire stretcher main body, and is operated so as to draw the first attaching unit toward the wire stretcher main body side by winding up the traction unit into the wire stretcher main body; a driving source which has an electric motor for applying a driving force to the rotation driving mechanism and whose rotation is controlled by a switch; a brake mechanism that is integrally installed near the rotation driving mechanism in the wire stretcher main body, and used for controlling movements of the rotation driving mechanism and/or the first attaching unit; and a second attaching unit installed in the wire stretcher main body, wherein the traction unit is a chain or a belt-shaped member having a predetermined length, and the rotation driving mechanism has a structure that is mainly driven to rotate by a driving force of the electric motor of the driving source through the brake mechanism.

In accordance with the present invention relates to claim 2 that is pendent on the invention relating to claim 1, a wire tensioner further comprising: a transmitter for radio controlling the electric motor of the driving source; and a receiver attached to the driving source so as to receive a signal transmitted from the transmitter.

In accordance with the present invention relates to claim 3 that is pendent on the invention relating to claim 1 or 2, wherein the rotation driving mechanism comprises a first rotary shaft, a first spur gear fixed to the first rotary shaft, a second rotary shaft 34, a second spur gear fixed to the second rotary shaft, and a load sheave coupled to the second spur gear, and the brake mechanism comprises a third rotary shaft, a third spur gear threadedly engaged with the third rotary shaft, a brake plate and a pinion gear, and wherein the first spur gear of the rotation driving mechanism and the third spur gear of the brake mechanism are engaged with each other and the second spur gear of the rotation driving mechanism and the pinion gear of the brake mechanism are engaged with each other.

In accordance with the present invention relates to claim 4 that is pendent on the invention relating to claim I or 2, wherein the wire stretcher main body has a casing that houses the rotation driving mechanism and the brake mechanism, and the casing comprises a rotation driving mechanism housing unit having a substantially longitudinally long rectangular cylindrical shape, which incorporates the rotation driving mechanism., a brake mechanism housing unit having a cylindrical shape, which incorporates the brake mechanism, and an electric rotary machine fixing member for use in fixing the electric rotary machine to the rotation driving mechanism housing unit, and wherein the rotation driving mechanism housing unit and the brake mechanism housing unit are installed side by side so as to be laterally adjacent to each other, the electric rotary machine fixing member having a rectangular shape when seen in a plan view is fixed to an upper surface of the rotation driving mechanism housing unit, and the electric rotary machine fixing member has an electric rotary machine insertion hole formed above the first rotary shaft, so that the electric rotary machine insertion hole allows the electric rotary machine on a chuck side to be inserted and held therein.

In accordance with the present invention relates to claim 5 that is pendent on the invention relating to any one of claims 1 to 4, wherein the first rotary shaft is disposed in the center of the electric rotary machine insertion hole of the electric rotary machine fixing member so as to make the rotary shaft direction is set to a direction that is orthogonal to or intersects with a lateral direction in which the first chain rotates, and the upper end portion thereof is chucked by a chuck of the electric rotary machine serving as the driving source, when the first rotary shaft is driven to rotate.

In accordance with the present invention relates to claim 6 that is pendent on the invention relating to any one of claims 1 to 5, wherein the rotation driving mechanism comprises a first rotary shaft, a first spur gear fixed to the first rotary shaft, a second rotary shaft 34, a second spur gear fixed to the second rotary shaft, and a load sheave coupled to the second spur gear, and the brake mechanism comprises a third rotary shaft, a third spur gear threadedly engaged with the third rotary shaft, a brake plate and a pinion gear, and wherein the first spur gear of the rotation driving mechanism and the third spur gear of the brake mechanism are engaged with each other and the second spur gear of the rotation driving mechanism and the pinion gear of the brake mechanism are engaged with each other so that in response to the rotation of the third spur gear, the disc, the first brake lining, the ratchet-type brake gear and the second brake lining are allowed to rotate the brake plate by a surface-contact frictional force so as to rotate the pinion gear.

In accordance with the present invention relates to claim 7 that is pendent on the invention relating to any one of claims 1 to 6, wherein the brake mechanism comprises a third rotary shaft, a third spur gear threadedly engaged with the third rotary shaft, a brake plate and a pinion gear, as well as a disc that is inserted to the third rotary shaft, a first brake lining, a ratchet-type brake gear, a second brake lining and a stop claw capable ot engaging with the ratchet-type brake gear to be locked, and wherein the third rotary shaft is controlled so as not to reversely rotate by the surface contact frictional force exerted among the disc of the brake mechanism, the first brake lining, the ratchet-type brake gear and the second brake lining, as well as by the stop claw that is engaged with the ratchet-type brake gear to be locked.

[0011]

In accordance with the present invention, since a traction unit is made by not a wire but a chain, the chain can be bent by 90 degrees or can be folded back by 180 degrees at a desired position; therefore, the degree of freedom in handling the traction unit becomes higher so that the resulting device is suitably used for a quick wiring work for an overhead wire or the like.

[0012]

Moreover, since a rotation driving mechanism has a structure to be driven to rotate mainly by a driving force of an electric motor serving as a driving source, the rotation driving mechanism is allowed to have a higher rotation speed. Therefore, an operation for drawing the first attaching unit toward the wire stretcher main body by winding up the traction unit into the wire stretcher main body can be carried out more quickly.

[0013]

In the present invention, the ON/OFF operation or the like of the electric motor can be controlled by radio waves, an operator can carry out a job for drawing the first attaching unit toward the wire stretcher main body by winding up the traction unit into the wire stretcher main body front a position far apart from the wire stretcher. Therefore, if the gripping between the overhead wire and the wire gripper should fall off, there is no fear that the wire gripper might come flying toward the operator to get hurt, or that the operator might touch the overhead wire to get an electric shock. Furthermore, since the wire gripper of the present invention is controlled by radio waves, no signal line is required, and the resulting device is suitably used for a quick wiring work for an overhead wire or the like.

[0014]

Moreover, in the present invention, in the case when a battery for supplying power to the driving source is attached to the driving source, since the battery is integrally installed together with the driving source, no power supply code is required so that the resulting device is suitably applied to a quick wiring work for an overhead wire or the like.

Furthermore, in the present invention, in the case when the driving source is prepared as an electric drill, since the driving source is compatibly used as the electric drill, it becomes not necessary to bring an electric drill separately.

In the present invention, since a brake mechanism is engaged with the rotation driving mechanism simply from the structural point of view, it is possible to miniaturize the wire stretcher,

Effects of the Invention [0015]

In accordance with the present invention, it becomes possible to provide a wire tensioner that can carry out a wiring work of an overhead wire or the like safely and quickly.

[0016]

These and other objects, features and advantages of the present invention will become apparent upon consideration of the preferred embodiments of the present invention taken in conjunction with the accompanying drawing.

BRIEF DESCRIPTION OF THE DRAWINGS

[0017] FIG. 1 is an exploded perspective view showing one embodiment of a wire tensioner in accordance with the present invention. FIG. 2 is an assembling perspective view of the wire tensioner shown in FIG. 1. FIG. 3 is a perspective view seen from the front side of a wire stretcher main body. FIG. 4 is a plan view of the wire stretcher main body. FIG. 5 is a perspective view seen from the right side of the wire stretcher main body. FIG. 6 is a perspective view seen from the rear side of the wire stretcher main body. FIG. 7 is a perspective view seen from the left side of the wire stretcher main body. FIG. 8 is a bottom view of the wire stretcher main body. FIG. 9 is a front cross-sectional view of the wire stretcher main body. FIG. 10A is a plan cross-sectional view of the wire stretcher main body. FIG. 10B is a bottom cross-sectional view of the wire stretcher main body. FIG. IOC is a view showing an illustration of a load sheave. FIG. 11(A) is a partial right side cross-sectional view of the wire stretcher main body, and FIG. 11(B) is a plan view showing an illustration of the wire stretcher main body. FIG. 12 is an exploded perspective view showing a rotation driving mechanism and a brake mechanism. FIG. 13 is a front view showing a driving source (electric rotary machine). FIG. 14AandFIG. 14B, which show a receiver, are an outsi^ perspective view and a bottom plan view respectively. FIG. 15 is a perspective view for explaining a usage procedure of the wire tensioner. FIG. 16 is a flow chart showing the usage procedure of th6 wire tensioner. FIG. 17A and FIG. 17B, which show a ratchet handle, are a front view and a plan view respectively. FIG. 18 is a front view showing a conventional wij~6 tensioner.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] (Configuration of Wire tensioner) FIG, 1 is an exploded perspective view showing one embodiment of a wire tensioner in accordance with the present invention, FIG. 2 is an assembling perspective view of the wire tensioner shown in FIG, 1. The wire tensioner 1 makes it possible to draw a free end of an overhead wire or the like toward an electric pole C side, and to be held thereon in a wiring work or the like.

The wire tensioner 1 is designed to stretch an overhead wire in a direction that is orthogonal to, or intersects with an electric pole C vertically placed on the ground, that is, in a direction in parallel with the ground or in a horizontal direction relative to the ground, so as to be installed, that is, so as to be subjected to a so-called "lateral· hanging process".

[0019]

The wire tensioner 1 is schematically constituted by a wire stretcher main body 2, a first attaching unit 5 for use in attaching a first wire gripper 900 (to be described later), a first chain 6 serving as a traction unit for use in coupling the wire stretcher main body 2 and the first attaching unit 5 with each other, an electric rotary machine 7 serving as a driving source provided with an electric motor, a second attaching unit 8 for holding a butt wire 830 (to be described later) for use in attaching the wire tensioner 1 to an electric pole C, a transmitter 9 for controlling the electric motor of the electric rotary machine 7 by radio waves, a receiver 10 for receiving a signal transmitted from the transmitter 9, a battery 11 for supplying power to the electric rotary machine 7 and a third attaching unit 12 for use in fixing the first chain 6.

[0020]

In the present embodiment, the wire tensioner 1 has a maximum use tension of 30 kN and a total weight of 16 kg. The wire stretcher main body 2 has 12 kg. The electric rotary machine 7 has 2.2 kg.

[0021] (Configuration of Wire stretcher Main Body) FIG. 3 is a front view showing a wire stretcher main body 2, FIG. 4 is a plan view thereof, and FIG. 5 is a right side view thereof. FIG. 6 is a perspective view showing the 'wire stretcher main body 2 viewed from the rear side. FIG. 7 is a left side view of the wire stretcher main body 2, and FIG, 8 is a bottom plan view thereof . The wire stretcher main body 2 is constituted by a casing 20, a rotation driving mechanism 3 and a brake mechanism 4 to be described later, which are integrally installed in the casing 20.

[0022]

The casing 20 is provided with a rotation driving mechanism housing unit 22 having a substantially longitudinally long rectangular cylindrical shape, which incorporates the rotation driving mechanism 3, a brake mechanism housing unit 24 having a substantially cylindrical shape, which incorporates the brake mechanism 4, and an electric rotary machine fixing member 26 for use in fixing the electric rotary machine 7 to the rotation driving mechanism housing unit 22.

[0023]

The rotation driving mechanism housing unit 22 and the brake mechanism housing unit 24 are laterally arranged side by side without a separation wall being formed in the vertical direction (length direction) . The rotation driving mechanism housing unit 22 is set so as to have a height higher (longer) than that of the brake mechanism housing unit 24. This structure is prepared so as to ensure a space by which the tip on a chuck 720 side of the electric rotary machine 7 serving as a driving source can be sufficiently housed inside the rotation driving mechanism housing unit 22 and firmly fixed to the casing 20.

[0024] (Configuration of Rotation Driving Mechanism Housing Unit)

As shown in FIG. 3, the rotation driving mechanism housing unit 22 is schematically provided with an upper surface 220 having a flat plate shape, a bottom surface 222 having a flat plate shape, a front face 224 having a flat plate shape, a first side face 225 having a flat plate shape, a back face 226 having a flat plate shape and a second side face 227 having a flat plate shape.

[0025]

On a lower portion of the front face 224 of the rotation driving mechanism housing unit 22, a bolt attaching mount portion 228 that extends in a horizontal direction is formed. On the bolt attaching mount portion 228, an attaching hole 230 having its axis in the vertical direction is formed.

[0026] Äs shown in FIG. 4, the upper surface 220 of the rotation driving mechanism housing unit 22 has a rectangular shape when seen in a plan view and forms an opening.

[0027]

As shown in FIG. 5, on the upper portion of the first side face 225 of the rotation driving mechanism housing unit 22, an electric rotary machine operating window 232 having a rectangular shape is formed. Through the electric rotary machine operating window 232, the chuck 720 of the electric rotary machine 7 is pivotally operated. On a lower portion of the first side face 225, a first expansion unit 234 is expanded outward.

[0028]

Below the first expansion unit 234, two chain inlet/outlet openings 236 and 238, which form an inlet and an outlet when the first chain 6 forming the traction unit is inserted/drawn into/from the inside of the wire stretcher main body 2, are formed side by side. Each of the chain inlet/outlet openings 236 and 238 is designed to have a cross-shape such that the first chain 6 is inserted/drawn into/from the wire stretcher main body 2 in its width direction, that is, in its lateral direction, without being entangled.

[0029]

As shown in FIG. 6 and FIG. 7, on an upper portion of the back face 226 of the rotation driving mechanism housing unit 22, an electric rotary machine operating window 239 having a rectangular shape is formed. Through the electric rotary machine operating window 239, the chuck 720 of the electric rotary machine 7 is pivotally operated. On a lower portion of the back, face 226, a fixing member 70 for use in fixing a second attaching unit 8 and a third attaching unit 12 to the wire stretcher main body 2 is placed along the back face 226.

As shown in FIG. 6, the fixing member 70 is constituted by a first horizontal unit 70a and a second horizontal unit 70b, as well as a first vertical unit 70c and a second vertical unit 70d.

[0030]

As shown in FIG. 6 and FIG. 10, to the first vertical unit 70c, a joint bolt 74 is tightened by a nut in a state where it is inserted, with the bolt axial direction being aligned with the vertical direction, and secured thereto.

[0031]

As shown in FIG. 6 and FIG. 7, to the second side face 227 of the rotation driving mechanism housing unit 22, the brake mechanism housing unit 24 is installed so as to be adjacent thereto, without any separation wall being formed therebetween.

[0032]

As shown in FIG. 5 and FIG. 8, onto the bottom surface 222 of the rotation driving mechanism housing unit 22, a lower side end portion 34b (to be described later) of a second rotation shaft 34 of the rotation driving mechanism 3 penetrates and protrudes outward, and is secured thereto by being fastened by a nut.

[0033] (Configuration of Brake Mechanism Housing Unit)

As shown in FIG. 3 and FIG. 4, the brake mechanism housing unit 24 is schematically provided with an upper surface 240, a bottom surface 242, a front face 244, a side face 245 and a back face 246. Additionally, the right side face of the brake mechanism housing unit 24 does not exist because the brake mechanism housing unit 24 is formed on the left side of the rotation driving mechanism housing unit 22 so as to be adjacent thereto.

[0034]

The front face 244 of the brake mechanism housing unit 24 has a circular arc shape (cross-sectional shape when cut in a horizontal direction) in its laterally cross-sectional shape, and is formed so as to be connected to the front face 224 of the rotation driving mechanism housing unit 22.

[0035]

As shown in FIG. 4, the upper surface 240 of the brake mechanism housing unit. 24 is closed, and formed so as to be connected to a second side face 227 of the rotation driving mechanism housing unit 22.

[0036]

As shown in FIG. 6 and FIG. 7, the back face 246 of the brake mechanism housing unit 24 is formed so as to be connected to the back face 226 of the rotation driving mechanism housing unit 22. In the center portion of the back face 246, a second expansion unit 248 is expanded outward. Onto the second expansion unit 248, a stop claw operating window 250 is formed. From the stop claw operating window 250, a lever portion 54a (to be described later) of a stop claw 54 is drawn out.

[0037]

On a lower side of the second expansion unit 248, a substantially half portion on the second vertical unit 7 0d side of the fixing member 70 is formed along the back face 246.

[0038]

As shown in FIG. 8, the bottom surface 242 of the brake mechanism housing unit 24 is formed so as to be connected with the bottom surface 222 of the rotation driving mechanism housing unit 22. Onto the bottom surface 242, a lower side end portion 40b of a third rotary shaft 40 of the brake mechanism 4 penetrates and protrudes outward, and is secured thereto by-being fastened by a nut.

[0039] (Configuration of Electric Rotary Machine Fixing Member)

As shown in FIG. 3 and FIG. 4, an electric rotary machine fixing member 26 having a rectangular shape when seen in a plan view is fixed onto the upper surface 220 of the rotation driving mechanism housing unit 22 by using three fixing bolts 272a, 272b, and 272c that are disposed on three corners of the four corners.

[0040]

The electric rotary ' machine fixing member 26 is constituted by a rectangular ceiling portion 260 having a sufficient thickness for holding the electric rotary machine 7, a front face portion 262, a first side face portion 263, a back face portion 264 and a second side face portion 265 that are disposed on four side edges of the ceiling portion 260, Therefore, the electric rotary machine fixing member 26 has no bottom plate. In the center of the ceiling portion 260, an electric rotary machine insertion hole 2 68 is formed. The diameter of the electric rotary machine insertion hole 268 is set to such a dimension as to allow the tip on the chuck 720 side of the electric rotary machine 7 to be inserted and held therein.

[0041]

The electric rotary machine insertion hole 268 has a slit 270 formed so as to be connected thereto. The slit 270 extends in a radial direction outward from the electric rotary machine insertion hole 268, and reaches the edge of the ceiling portion 260, The front face portion 262 is divided by the slit 270 into a first side face portion 263 and a second side face portion 265, and is provided with a first front face portion 262a on the first side face portion 263 side and a second front face portion 262b on the second side face portion 265 side of the divided front face portion 262. A tightening member 274 is provided with a fixing bolt 272c, and the fixing bolt 272c is passed from the first front face portion 262a over the second front face portion 262b.

The first front face portion 262a is allowed to come close to or depart from the second front face portion 262b fixed to a predetermined position by the fixing bolt 272c by the pivotal movements of the tightening member 274. In other words, the slit 270 is installed between the second front face portion 2 62b, with the fixing bolt 272c being disposed only on one side, and the first front face portion 262a. The electric rotary machine fixing member 26 has its tip portion on the chuck 720 side of the electric rotary machine 7 firmly fixed, with its diameter being narrowed by its elastic force.

[0042]

On the back side of the ceiling portion 260, a tightening member 274 having a substantially bolt structure is attached in parallel with the ceiling portion 2 60 in a manner so as to avoid the electric rotary machine insertion hole 268. That is, the tightening member 274 is disposed in a direction parallel to substantially the same direction (tangential direction of the electric rotary machine insertion hole 268} as a direction in which the interval width d of the slit 270 is narrowed when the electric rotary machine 7 is fixed to the electric rotary machine fixing member 26. An tightening side end portion 274a of the tightening member 274 is threadedly engaged with the front face portion 262 from, the first side face portion 263, and allowed to penetrate the first side face portion 263 to be joined to a handle 276. A fixing side end portion 274b of the tightening member 274 extends along the front face portion 262, gets over the position of the slit 270, and is fixed on the back side of the ceiling portion 260.

[0043]

The electric rotary machine insertion hole 268 is formed into a substantially round shape when seen in a plan view so as to insert a tip on the chuck 720 side of the electric rotary machine 7, which has a substantially round shape when seen in a bottom view.

Moreover, on an upper side of the chuck 720 of the electric rotary machine 7, the electric rotary machine insertion hole 268 is provided with an escape groove 278 formed as a concave portion for use in inserting a locking protrusion 722 that protrudes in a peripheral direction.

The escape groove 278 is formed by partially cutting off the electric rotary machine insertion hole 268, and prepared as two portions on the front side and the farther side. A first escape groove 278a on the front side is formed with right and left divided sections, with the slit 270 being sandwiched in between.

The first escape groove 278a on the front side and a second escape groove 278b on the farther side have substantially rotation symmetry.

The electric rotary machine insertion hole 268 is provided with a locking edge 280a and a locking edge 280b for use in locking the upper edge of the locking protrusion 722. of the electric rotary machine 7, on the bottom surface side of the electric rotary machine fixing member 26.

The locking edge 280a and the locking edge 280b are formed so as to be substantially orthogonal to the inner circumferential edge of the electric rotary machine insertion hole 268.

The locking protrusion 722 of the electric rotary machine 7 is formed as protruding bands made of right and left divided portions on the upper side of the chuck 720, with each of the upper edges thereof forming a horizontal surface or a tilted surface that is slightly lowered frontward.

Moreover, the chuck 720 side of the electric rotary machine 7 is inserted and fitted to the electric rotary machine insertion hole 268, that is, the locking protrusion 722 of the electric rotary machine 7 is inserted and fitted to the escape groove 278 of the electric rotary machine insertion hole 268. By rotating 1/36 or 1/24 of one rotation around the center axis of the chuck 720 of the electric rotary machine 7 (substantially 10 to 15 degrees in rotation angle) , the electric rotary machine 7 allows the locking protrusion 722 of the electric rotary machine 7 to be locked in the locking edge 280a and the locking edge 280b of the electric rotary machine insertion hole 268.

Thus, the locking protrusion 722 of the electric rotary machine 7, the locking edge 280a and the locking edge 280b have a coming-off preventing function for the electric rotary machine 7, thereby making it possible to prevent the electric rotary machine 7 from dropping down.

[0044]

In the case when the electric rotary machine 7 is attached to the wire stretcher main body 2, by manually carrying out rotating operations of the handle 27 6 of the tightening member 274 in a forward rotating direction,, the electric rotary machine fixing member 2 6 is tightened so that the interval width d of the slit 270 is narrowed non-stepwisely and diameter-reduced. Consequently, the diameter of the electric rotary machine insertion hole 268 becomes smaller so that the tip on the chuck 720 side of the electric rotary machine 7 is firmly fixed to the electric rotary machine fixing member 26.

[0045]

On the other hand, in the case when the electric rotary machine 7 is removed from the wire stretcher main body 2, the handle 276 of the tightening member 274 is manually rotation-operated in a reversed rotation direction so that the electric rotary machine fixing member 26 is loosened to make the interval width d of the slit 270 widened. Thus, the diameter of the electric rotary machine insertion hole 268 becomes larger so that the tip on the chuck 720 side of the electric rotary machine 7 can be removed from the electric rotary machine fixing member 26.

[0046] (Configuration of Rotation Driving Mechanism) FIG. 9 is a front-face cross-sectional view of the wire stretcher main body 2, and FIG. 10 is a plan cross-sectional view thereof. FIG. 11 is a partial right side-face cross-sectional view of the wire stretcher main body 2. FIG. 12 is an exploded perspective view showing the rotation driving mechanism 3 and the brake mechanism 4.

[0047]

The rotation driving mechanism 3 is operated such that by winding up the first chain 6 serving as the traction unit into the wire stretcher main body 2, the first attaching unit 5 is drawn toward the wire stretcher main body 2. That is, the rotation driving mechanism 3 has a function for inserting/drawing the first chain 6 serving as the traction unit into/from the wire stretcher main body 2. The rotation driving mechanism 3 has such a structure as to carry out a rotation driving operation mainly by a driving force of the electric motor of the electric rotary machine 7 serving as a driving source, [0048]

As shown in FIG. 9 to FIG. 12, the rotation driving mechanism 3 that is integrally built in the rotation driving mechanism housing unit 22 is schematically provided with a first rotary shaft (driving shaft) 30, a first spur gear 32 fixed to the first rotary shaft 30, a first rotary shaft holding member 310 for holding the first rotary shaft 30, a second rotary shaft (driven shaft) 34, second spur gears 36 that are fixed to the second rotary shaft 34 in succession from above downward and a load sheave 38.

[0049]

The first rotary shaft holding member 310 is fixed on an upper side of an intermediate base mounting unit 27 of the casing 20 located below the electric rotary machine insertion hole 268 of the electric rotary machine fixing member 26 by utilizing a plurality of fixing bolts 316. The first rotary shaft holding member 310 is provided with an upper plate 312, a lower plate 314 and a side plate (not shown).

[0050]

The first rotary shaft 30 is made of a steel rod having a substantially column shape.

The first rotary shaft 30 is disposed in the center of the electric rotary machine insertion hole 268 of the electric rotary machine fixing member 26 so as to have its rotation axial direction set in a vertical direction, that is, in a direction that is orthogonal to, or intersects with the lateral direction in which the first chain 6 rotates, and is freely rotatably supported by the first rotary shaft holding member 310.

An upper side end portion 30a of the first rotary shaft 30, which has a hexagonal pillar shape, penetrates the upper plate 312 of the driving rotary shaft holding member 310, and protrudes upward therefrom. When the first rotary shaft 30 is driven to rotate, the upper side end portion 30a is subjected to a chucking process by the chuck 720 of the electric rotary machine 7 serving as a driving source. A lower side end portion 30b of the first rotary shaft 30 is freely rotatably supported by the lower plate 314 of the driving rotary shaft holding member 310. When the first rotary shaft 30 is supported, no bearing is used because of a load applied thereto.

[0051]

The first spur gear 32 has a round shape, when seen in a plan view, and is provided with a hollow core portion 32a that is in parallel with teeth lines on its outer circumference, and installed in the center thereof.

The first spur gear 32 is disposed between the upper plate 312 and the lower plate 314 of the first rotary shaft holding member 310. The first spur gear 32 is fixed onto the first rotary shaft 30 so as to allow the core portion 32a serving as its rotary shaft to be coaxial with the first rotary shaft 30. The first spur gear 32 and a third spur gear 46 (to be described later) of the brake mechanism 4 are engaged with each other.

[0052] A second rotary shaft 34 is made of a steel rod having a substantially column shape.

The second rotary shaft 34 is disposed so as to have its rotation axial direction set in a vertical direction, that is, in a direction that is orthogonal to, or intersects with a direction in which the first chain 6 rotates. An upper side end portion 34a of the second rotary shaft 34 is freely rotatably supported on the intermediate base mounting unit 27 of the casing 20. A lower side end portion 34b of the second rotary shaft 34 penetrates a bottom portion 28 of the casing 20 (in other words, the bottom surface 222 of the rotation driving mechanism housing unit 22) and protrudes therefrom, and is fastened by a nut.

[0053] A second spur gear 36 has a round shape when seen in a plan view, and is provided with a hollow core portion 36a that is in parallel with teeth lines on its outer circumference, and installed in the center thereof.

The second spur gear 36 is disposed on a lower side from the intermediate base mounting unit 27 of the casing 20. The second spur gear 36 is fixed onto the second rotary shaft 34 so as to allow the core portion 36a serving as its rotary shaft to be coaxial with the second rotary shaft 34. The second spur gear 36 and a pinion gear 53 (to be described later) of the brake mechanism 4 are engaged with each other.

[0054]

The load sheave 38 is disposed below the second spur gear 36. The load sheave 38 is fixed to the second rotary shaft 34 so as to allow the rotary shaft of a wheel 38b to be coaxial with the second rotary shaft 34.

The load sheave 38 is provided with a pocket 38a that is formed so as to be engaged with the first chain 6 and the wheel 38b having teeth, and is designed to move the first chain 6 in a direction orthogonal to the second rotary shaft 34, that is, in a lateral direction.

The pocket 38a rounds around the second rotary shaft 34 in a horizontal direction, while the wheel 38b rotates in a horizontal direction so that the teeth of the wheel 38b are engaged with the first chain 6 so as to move the first chain 6 in a horizontal direction.

[0055]

To the load sheave 38, a wind-up side end portion 6b (to be described later) of the first chain 6 serving as the traction unit is fixed. When the second rotary shaft 34 rotates, the first chain 6 is wound up around the load sheave 36.

[0056] (Configuration of Brake Mechanism)

The brake mechanism 4 is engaged with the rotation driving mechanism 3 so as to be locked, and serves as a brake for controlling the movements of the first chain 6 such that even when the first chain 6 serving as the traction unit is loosened, the first chain 6 is prevented from being promptly drawn from the inside of the wire stretcher main body 2.

[0057]

As shown in FIG. 9, FIG. 10 and FIG. 12, the brake mechanism 4 that is integrally installed in the brake mechanism housing unit 24 is schematically provided with a third rotary shaft (driven shaft) 40, a knob 43, a third spur gear 46 fixed to the third rotary shaft 40, a brake plate 52 and a pinion gear 53, as well as a disc 47, a first brake lining 4 9, a ratchet-type brake gear 50 and a second brake lining 51, which are successively inserted to the third rotary shaft 40 from above downward, a stop claw 54 and a ratchet claw 55.

[0058]

The third rotary shaft 40 is disposed so as to have its .rotation axial direction set in a vertical direction, that is, in a direction that is orthogonal to, or intersects with the lateral direction in which the first chain 6 rotates. A center portion of the third rotary shaft 40 is freely rotatably supported by the intermediate base mounting unit 27 of the casing 20, with the brake plate 52 interposed therebetween. A lower portion of the third rotary shaft 40 is freely rotatably supported by the bottom portion 28 of the casing 20.

When the third rotary shaft 40 is supported, no bearing is used because of a load applied thereto.

[0059]

The third spur gear 46 is threadedly engaged with an upper side end portion 40a of the third rotary shaft 40. That is, on the third spur gear 46, a female screw hole core portion 46a is formed in the center thereof. The female screw hole core portion 4 6a is threadedly engaged with a male screw portion 40c of the upper side end portion 40a of the third rotary shaft 40 in such a manner that the third spur bear 46 is allowed to descend downward along the male screw portion 4 0c when the third spur gear 46 is rotated.

[0060]

The knob 43 is fixed to the third spur gear 46 by utilizing bolts with hexagonal hole 41a, 41b and spring washers 42a, 42b, with a split pin 44 and a check washer 45 being disposed in a gap relative to the third spur gear 46. The lower side end portion 4 0b of the third rotary shaft 40 penetrates the bottom portion 28 of the casing 20 (in other words, the bottom surface 242 of the brake mechanism housing unit 24) to protrude therefrom, and is tightened by a nut. The third spur gear 46 and the first spur gear 32 of the rotation driving mechanism 3 are engaged with each other.

[0061]

In order to prevent the third spur bear 4 6 from coming off from, the upper side end portion 40a, the split pin 44 is fixed, with legs 44a of the split pin 44 being inserted to a through hole 40d formed on an upper portion from the male screv; portion 40c of the upper side end portion 40a.

The check washer 45 has a core portion 45a formed in the center, with a locking protrusion portion 40b being formed on the outer periphery edge thereof. The check washer 45 is freely rotatably attached to the upper side end portion 40a of the locking protrusion portion 40 by the core portion 45a.

[0062]

The disc 47, which has a round plate shape, is provided with a hollow core portion 47a formed in the center.

The first brake lining 49, which is a flexible round plate made of a synthetic resin and a metal alloy, is provided with a hollow core portion 49a formed in the center thereof.

The ratchet-type brake gear 50, which is a round plate member, has teeth 50a formed in parallel with each other on the outer circumferential surface, with a hollow core portion 50b formed in the center thereof.

The second brake lining 51, which is a flexible round plate made of a synthetic resin and a metal alloy, is provided with a hollow core portion 51a formed in the center thereof.

The disc 47, the first brake lining 49, the ratchet-type brake gear 50 and the second brake lining 51 are freely rotatably attached to the center portion of the third rotary shaft 40, with the directions of their rotary shafts 40 being respectively aligned in the direction of the third rotary shaft 40, without being fixed to the third rotary shaft 40.

The disc 47 is inserted and fitted to the third rotary shaft 40 by the core portion 47a, the first brake lining 49 is fitted thereto by the core portion 49a, the ratchet-type brake gear 50 is fitted thereto by the core portion 50b, and the second brake lining 51 is fitted thereto by the core portion 51a, respectively.

Moreover, the disc 47, the first brake lining 49, the ratchet-type brake gear 50 and the second brake lining 51 are disposed between the third spur bear 46 and the brake plate 52 .

[0063]

The brake plate 52 is fixed to the third rotary shaft 40 so as to allow its rotary shaft to be coaxial with the third rotary shaft 40, while penetrating the intermediate base mounting unit 27 of the casing 20. That is, the brake plate 52 is designed to be integrally rotated together with the third rotary shaft 40.

[0064]

The pinion gear 53 is disposed on a lower side from the intermediate base mounting unit 27 of the casing 20. The pinion gear 53 is fixed to the third rotary shaft 40 so as to allow its rotary shaft to be coaxial with the third rotary shaft 40. That is, the pinion gear 53 is designed so as to be integrally rotated together with the third rotary shaft 40. The pinion gear 53 and the second spur gear 36 of the rotation driving mechanism 3 are engaged with each other.

[0065]

On the upper surface of the intermediate base mounting unit 27 of the casing 20, the stop claw 54 is attached to the fixing shaft 56 so as to freely swing thereon, in a state where it can. be engaged with the ratc.het~type brake gear 50 so as to be locked. The stop claw 54 has a lever portion 54a and a claw portion 54b so that by manually switching the lever portion 54a, the claw portion 54b is allowed to be engaged with the teeth of the ratchet-type brake gear 50 (locking) or disengaged from the teeth. The rotation direction of the ratchet-type brake gear 50 is regulated to a forward direction (clock-wise direction) with the stop claw 54 being engaged therewith, with the result that no reverse rotation (counter-clock-wise direction) is made, [0066]

Moreover, on the upper surface of the intermediate base mounting unit 27 of the casing 20, the ratchet claw 55 is attached to the fixing shaft 57 so as to freely swing thereon, while being pressed by an elastic member (spring member) 58. The ratchet claw 55 is engaged with teeth that are tilted in one direction of the ratchet-type brake gear 50 by the elastic force of the elastic member (spring member) 58. The ratchet claw 55 regulates the rotation in a reverse direction of the ratchet-type brake gear 50.

[0067] (Operations of Rotation Driving Mechanism and Brake Mechanism)

Next, the following description will explain operations of the rotation driving mechanism 3 and the brake mechanism 4.

[0068]

In a state where the first chain 6 serving as the traction unit is loosened, upper and lower surface contact frictional forces among the disc 47 of the rotation driving mechanism 3, the first brake lining 4 9, the ratchet-type brake gear 50, the second brake lining 51 and the brake plate 52 are weak, and the respective members are mutually independent (in a free state).

[0069]

Next, when the first rotary shaft 30 of the rotation driving mechanism 3 is driven to rotate by the electric rotary machine 7, the rotary force is transmitted to the third spur gear 46 of the brake mechanism 4 through the first spur gear 32 fixed to the first rotary shaft 30 so that the third spur gear 46 is allowed to rotate.

Since the third spur gear 4 6 is screwed with the male screw portion 40c. of the upper side end portion 4 0a of the third rotary shaft 40, it is lowered toward the brake plate 52 side as the third spur gear 46 rotates on the upper side end portion 40a of the third rotary shaft 40.

Thus, the interval between the third spur gear 46 and the brake plate 52 is narrowed.

[0070]

Since the disc 4 7 of the brake mechanism 4, the first brake lining 4 9, the ratchet-type brake gear 50 and the second brake lining 51 are not fixed to the third rotary shaft 40, the rotary force is not transmitted promptly. That is, even when the third rotary shaft 40 is rotated, the disc 47, the first brake lining 49, the ratchet-type brake gear 50 and the second brake lining 51 are not rotated promptly together with the third rotary shaft 40.

[0071]

However, the third spur gear 46, which is rotated as the first rotary shaft 30 and the first spur gear 32 rotate, is lowered in response to the rotation, on the upper side end portion 40a of the third rotary shaft 40. Accordingly, the disc 47 pressed by the third spur gear 46 and the brake plate 52 approach to each other, with the result that upper and lower surface contact frictional forces among the disc 47, the first brake lining 49, the ratchet-type brake gear 50, the second brake lining 51 and the brake plate 52 are gradually increased.

[0072]

When the surface contact frictional forces among the disc 47, the first brake lining 49, the ratchet-type brake gear 50, the second brake lining 51 and the brake plate 52 become stronger, the rotary force of the third spur gear 46 is gradually transmitted to the disc 47, the first brake lining 49, the ratchet.-type brake gear 50 and the second brake lining 51. That is, the disc 47, the first brake lining 49, the ratchet-type brake gear 50, the second brake lining 51 and the brake plate 52 are allowed to rotate.

[0073]

When the brake plate 52 rotates in accordance with the rotation of the third spur gear 46, the pinion gear 53 fixed to the third rotary shaft 40 rotates. Thus, the rotary force of the pinion gear 53 is transmitted to the second spur gear 36 of the rotation driving mechanism 3 engaged with the pinion gear 53 to be locked thereon.

Since the second spur gear 36 is fixed to the second rotary shaft 34, the rotary force thereof is transmitted to the second rotary shaft 34.

[0074]

When the second rotary shaft 34 rotates, the wheel 38b of the load sheave 38 fixed to the second rotary shaft 34 is rotated, with the result that the first chain 6 is engaged with the wheel 38b and rotates around the pocket 38a of the load sheave 36, and rhe first attaching unit 5 is drawn towatrd the wire stretcher main body 2 side.

[0075]

At this time, the stop claw 54 and the ratchet claw 55 are with, tne ratcnet-type brake gear 50 so as to allow only a rotation in the forward direction (clock-wise direction); thus, tne ratchet-type brake gear 50 is prevented from reversely rotating.

[0076]

Next, in the case when the first chain 6 serving as the traction unit is loosened, the stop claw 54 is removed from the ratchet-type brake gear 50, and the electric rotary machine 7 is reversely rotated so that it is loosened.

The ratchet claw 55 is engaged with the ratchet-type brake gear 50 so as to allow only a rotation in the forward direction (clock-wise direction).

At this time, since the disc 47, the first brake lining 49, the ratchet-type brake gear 50, the second brake lining 51 and the brake plate 52 are made in face-contact with one another by frictional forces, the first chain 6 is prevented from being promptly drawn from the inside of the wire stretcher main body 2. That is, the frictional force functions as a brake for controlling the movements of the first chain 6.

[0077]

Moreover, since the electric rotary machine 7 has a built-in brake mechanism as will be described later, upon stopping a rotation driving process, the rotation driving process is promptly stopped by its braking function.

Therefore, since double structural braking functions of the above-mentioned brake mechanism 4 and brake mechanism of the electric rotary machine 7 are prepared, the speed in which the first chain 6 is drawn from the inside of the wire stretcher main body 2 can be controlled.

[0078] (Configuration of First Attaching Unit)

The first attaching unit 5 is used for attaching a first wire gripper 900 (to be described later}.

[0079]

As shown in FIG. 1, FIG. 2 and FIG. 5, the first attaching unit 5 is provided with a hook portion 500 and a base portion 520. The hook portion 500 has a structure in which an opening/closing member 502 is disposed at the opening (between the base portion 500a and the tip portion 500b of the hook portion 500) of the hook portion 500 so as to open/close the front opening of the hook portion 500.

[0080]

The opening/closing member 502 has its base portion 502a attached to a fixing shaft 504 formed at the base portion 500a of the hook portion 500, and allowed to freely swing with the fixing shaft 504 serving as a support axis. To the opening/closing member 502, an elastic force is applied by a spring member (not shown) so as to make its tip portion 502b in press-contact with the tip portion 500b of the hook portion 500. By this structure, the first wire gripper 900 attached to the hook portion 500 is made to hardly come off.

[0081]

The base portion 520 is provided with a movable pulley housing unit 522 in which a movable pulley 526 is integrally housed, and a tip portion 524 that freely rotatably supports the hook portion 500 around a rotary shaft Q. The movable pulley 52 6 is freely rotatably supported by a fixing shaft 528 that is formed in the movable pulley housing unit 522. The first chain 6 serving as the traction unit is passed around the movable pulley 526.

[0082]

To the hook portion 500, an optimal first wire griper is preliminarily selected on the ground, and attached.

[0083] (Configuration of Traction Unit)

The first, chain 6 serving as the traction unit is used for coupling the wire stretcher main body 2 and the first attaching unit 5 to each other.

[0084]

As shown in FIG. 1, FIG. 2 and FIG. 5, the first chain 6 serving as the traction unit has its fixed-side end portion 6a fixed to a joint bolt 74 installed on the outside of the wire stretcher main body 2, and is wound around the movable pulley 526 of the first attaching unit 5 and folded back, with its wind-up side end portion 6b being wound around the load sheave 38 of the rotation driving mechanism 3 that is integrally installed in the wire stretcher main body 2.

[0085]

When the wheel 38b of the load sheave 38 attached to the second rotary shaft 34 is forwardly rotated, the first chain 6 on the side of the wind-up side end portion 6b is wound up onto the load sheave 38.

[0086] (Configuration of Second Attaching Unit)

The second attaching unit 8 is used for gripping a butt wire 830 (to be described later) for use in attaching the wire tensioner 1 to an electric pole C.

[0087]

As shown in F1C. 6, the second attaching unit 8 is attached to a second vertical portion 70d of the fixing member 70 of the wire stretcher main body 2 . The second attaching unit 8 is disposed on a side opposite to the side where the first attaching unit 5 and a third attaching unit 12 (to be described later) are installed,, with the wire stretcher main body 2 being located therebetween.

The second attaching unit 8 is attached to the wire stretcher main body 2 at substantially the same height position as that of the first attaching unit 5.

[0088]

The second attaching unit 8 is provided with a hook portion 800 and a base portion 820. The hook portion 800 protrudes from the base portion 820 in the width direction of the wire stretcher main body 2, that is, toward a lateral direction. The hook portion 800 has a structure in which an opening/closing member 802 is disposed at the front opening (between the base portion 800a and the tip portion 800b of the hook portion 800) of the hook portion 800 so as to open/close the front opening of the hook portion 800.

[0089]

The opening/closing member 802 has its base portion 802a attached to a fixing shaft 804 formed at the base portion 800a of the hook portion 800, and allowed to freely swing with the fixing shaft 804 serving as a support axis. To the opening/closing member 802, an elastic force is applied by a spring member (not shown) so as to make its tip portion 802b in press-contact with the tip portion 800b of the hook portion 800 . By this structure, the butt wire 830 attached to the hook portion 800 is made to hardly come off.

[0090]

The base portion 820 penetrates the second vertical portion 70d of the fixing member 70, and is disposed between a first horizontal portion 70a and a second horizontal portion 70b. The base portion 820 freely rotatably supports the hook portion 800 around a rotary shaft R (illustrated in FIG. 6).

[0091]

To the hook portion 800, an optimal butt wire 830 is preliminarily selected on the ground, and directly attached or attached with a hook or the like interposed therebetween.

[0092] (Configuration of Third Attaching Unit)

The third attaching unit 12 is used for attaching the wind-up side end portion 6b (to be described later) of the first chain 6, for example, to the bolt attaching mount portion 228.

[0093]

As shown in FIG. 2, FIG. 5 and FIG. 8, the third attaching unit 12 is provided with a joint bolt 124 that can be inserted to an attaching hole 230 of the bolt attaching mount portion 228, and a U-letter shape member 122 that supports the joint bolt 124, with its front opening being freely openable or closabie. The tip of the wind-up side end portion 6b of the first chain 6 is fixed to the ϋ-letter shape member 122 of the third attaching unit 12.

[0094]

As shown in FIG. 5 and FIG. 8, an fixed-side end portion 6a of the first chain 6 is attached to a joint bolt 74 disposed on a first vertical portion 70c of the fixing member 70 of the wire stretcher main body 2. The first chain 6 is wound around the first attaching unit 5, and the wind-up side end portion 6b thereof enters the load sheave 38 of the wire stretcher main body 2 through the chain inlet/outlet opening 238. Thus, the wind-up side end portion 6b of the first chain 6 passed around the pocket 38a of the load sheave 38 is fixed to the U-letter shape member 122 of the third attaching unit 12.

[0095] (Configuration of Driving Source)

The electric rotary machine 7 serving as the driving source is used for applying a rotary driving force to the rotation driving mechanism 3, and has an electric motor. As shown in FIG. 1, FIG. 2 and FIG, 13, the electric rotary machine 7 is a rotary machine for an electric drill, and the electric motor of the electric rotary machine 7 applies the rotary driving force to the rotation driving mechanism 3.

[0096]

The electric rotary machine 7 is schematically provided with an electric rotary machine main body 700, an electric motor and a brake mechanism (not shown) integrally installed in the electric rotary machine main body 700, a forward/reverse rotation switching switch (not shown) of the electric motor installed on the electric rotary machine main body 700, the chuck 720 that is attached to the tip of the electric rotary machine main body 700, a handle 740 that is installed in the center portion of the electric rotary machine main body 700, a receiver attaching unit 760 formed on a lower portion of the handle 740 and an attaching metal fitting 780 formed on the receiver attaching unit 760.

The chuck 720 is attached to the tip of the rotary shaft of the electric motor, and has a structure capable of grabbing a rod-shaped object. Additionally, the electric rotary machine 7 is a conventionally known commercial device so that the detailed description thereof will be omitted.

[0097]

Upon attaching the electric rotary machine 7 to the wire stretcher main body 2, the chuck 720 of the electric rotary machine main body 700 is inserted into an electric rotary machine insertion hole 268 of the electric rotary machine fixing member 26 that is fixed to an upper surface 220 of the rotation driving mechanism housing unit 22 of the wire stretcher main body 2.

[0098]

When the chuck 720 is set at such a position as to surround the upper side end portion 30a of the first rotary shaft 30 of the rotary driving mechanism 3 that is integrally installed in the rotation driving mechanism housing unit 22, the handle 27 6 of the tightening member 274 is operated to rotate in the forward rotation direction as shown in FIG. 7 so that the electric rotary machine fixing member 2 6 is tightened. Thus, the diameter of the electric rotary machine insertion hole 268 is narrowed so that the tip on the chuck 720 side of the electric rotary machine main body 700 is firmed fixed onto the electric rotary machine fixing member 26.

[0099]

Next, through the two electric rotary machine operation windows 232, 239 formed in the rotation driving mechanism housing unit 22, the chuck 720 is tightened. Thus, the chuck 720 chucks (grips) the upper side end portion 30a of the first rotary shaft 30, and the first rotary shaft 30 is driven to rotate together with the driving operation of the electric rotary machine 7.

[0100]

Upon removing the electric rotary machine 7 from the wire stretcher main body 2, the chuck 720 is loosened through the two electric rotary machine operation windows 232, 239 formed in the rotation driving mechanism housing unit 22. Thus, the chuck 720 is unchucked from the upper side end portion 30a of the first rotary shaft 30.

[0101]

Next, as shown in FIG. 7, the handle 27 6 of the tightening member 274 is operated to rotate in the reverse rotation direction so that the electric rotary machine fixing member 26 is loosened. Thus, the diameter of the electric rotary machine insertion hole 2 68 becomes larger so that the electric rotary machine main body 700 can be removed from the electric rotary machine fixing member 26. In this manner, the electric rotary machine 7 can be easily detachably attached to the wire stretcher main body 2.

[0102]

Moreover, the electric rotary machine 7 is constituted such that when the transmitter 9 {to be described later) is operated by the operator so that an ON/OFF control signal for the electric motor is transmitted from the transmitter 9 to the receiver 10 (to be described later) by radio waves, it receives the ON/OFF control signal from the receiver 10 through the receiver attaching unit 760 so as to execute an ON/OFF

Controlling process of the electric motor.

[0103]

Upon winding up the first chain 6 serving as the traction unit into the wire stretcher main body 2, the forward/reverse rotation switching switch (not shown) of the electric motor installed in the electric rotary machine 7 is manually switched to the "forward rotation" side by the operator. In accordance with this operation, the lever portion 54a of the stop claw 54 formed on the wire stretcher main body 2 is manually switched so that the claw portion 54b of the stop claw 54 is engaged with the ratchet-type brake gear 50 to be locked (see FIG. 10 and FIG. 12}.

[0104]

Thereafter, the transmitter 9 is operated by the operator so that an ON signal for the electric motor is transmitted from the transmitter 9 to the receiver 10 by radio waves. Upon receipt of the ON signal from the receiver 10, the electric rotary machine 7 has its electric motor forwardly rotated and the first rotary shaft 30 of the rotation driving mechanism 3 is driven to forwardly rotate. Thus, the first chain 6 serving as the traction unit has its wind-up side end portion 6b wound up into the wire stretcher main body 2 so that the first attaching unit 5 is drawn toward the wire stretcher main body 2.

[0105]

When the first chain 6 is wound up into the wire stretcher main body 2 by a desired length, the transmitter 9 is operated by the operator so that an OFF signal for the electric motor is transmitted from the transmitter 9 to the receiver 10 by radio waves. Upon receipt of the OFF signal from the receiver 10, the electric rotary machine 7 has its electric motor stopped so that the rotation of the first rotary shaft 30 of the rotation driving mechanism 3 is stopped, [0106]

On the other hand, in the case when the first chain 6 is drawn from the inside of the wire stretcher main body 2 to be loosened, the forward/reverse rotation switching switch (not shown) of the electric motor installed in the electric rotary machine main body 700 is switched to the "reverse rotation" side by the operator. In accordance with this operation, the lever portion 54a of the stop claw 54 formed on the wire stretcher main body 2 is manually switched so that the claw portion 54b of the stop claw 54 is released from the ratcbet-type brake gear 50, [0107]

Thereafter, the transmitter 9 is operated by the operator so that the ON signal for the electric motor is transmitted from the transmitter 9 to the receiver 10 by radio waves. Upon receipt of the ON signal from the receiver 10, the electric rotary machine 7 has its electric motor reversely rotated and the first, rotary shaft 30 of the rotation driving mechanism 3 is driven to reversely rotate. Thus, the first chain 6 serving as the traction unit has its wind-up side end portion 6b drawn from the wire stretcher main body 2.

[0108]

When the first chain 6 is drawn from the inside of the wire stretcher main body 2 by a desired length, the transmitter 9 is operated by the operator so that the OFF signal of the electric motor is transmitted from the transmitter 9 to the receiver 10 by radio waves. Upon receipt of the OFF signal from the receiver 10, the electric rotary machine 7 has its electric motor stopped so that the rotation of the first rotary shaft 30 of the rotation driving mechanism 3 is stopped.

[0109]

Moreover, the tension of the wire tensioner 1 is calculated by the following calculating formula: 63N. τα (torque of electric rotary machine 7) χ 2/1 (gear ratio) - 126N. m 126N. m x 23T/7T (reduction ratio of wire stretcher main body 2) = 414N. m 414N. m x 2/1 (movable pulley) = 828N. m == 8280 kg. cm 8280 kg. cm χ 1/2.575 (radius of load sheave 38) = 3010 kg [0110]

In the case when the electric rotary machine 7 is used for an electric rotary machine as a driving source, since the resulting structure is allowed to compatibly use the driving source and the electric rotary machine, it is not necessary to separately carry an electric rotary machine, and the resulting method is suitably used for a stretching work of an overhead wire or the like.

[0111] {Configuration of Transmitter)

The transmitter 9 is used for wireless-controlling the electric motor of the electric rotary machine 7. As shown in FIG. 1 and FIG. 2, the transmitter 9 is provided with a control box 90 having a substantially rectangular parallelepiped shape, an electronic part mounting circuit substrate (not shown) that is integrally installed in the control box 90, an ON switch 92 and an OFF switch 93 disposed on the upper surface of the control box 90 and a transmission-use infrared ray light-emitting diode 96 that is installed on one of side faces of the control box 90.

[0112]

When the ON switch 92 is pressed, a wireless signal (infrared ray) for use in activating the electric motor of the electric rotary machine 7 is transmitted toward the receiver 10 from the transmission-use infrared ray light-emitting diode 96. On the other hand, when the OFF switch 93 is pressed, a wireless signal (infrared ray) for use in stopping the electric motor of the electric rotary machine 7 is transmitted toward the receiver 10.

[0113]

Therefore, the operator can carry out the ON/OFF control of the electric motor of the electric rotary machine 7 by radio waves from a position apart from the wire tensioner 1.

[0114]

Additionally, the transmitter 9 of the present embodiment only carries out the ON/OFF control of the electric motor of the electric rotary machine 7; however, it may be configured so as to control the forward/reverse rotation or the like of the electric motor.

[0115] (Configuration of Receiver)

The receiver 10 is used for receiving a wireless signal transmitted from the transmitter 9. As shown in FIG. 1 and FIG. 2, the receiver 10 is attached to the transmitter attaching unit 760 of the electric rotary machine 7. FIG. 14 (A) and FIG. 14(B) are views showing a receiver; FIG. 14(A) is an outside perspective view, and FIG. 14(B) is a bottom view.

[0116]

As shown in FIG. 14, the receiver 10 is provided with a case 100 having a substantially rectangular parallelepiped shape, an electronic part mounting circuit substrate (not shown) integrally installed in the case 100 and three receiving photodiodes 108a, 108b and 108c.

[0117]

The case 100 is provided with a first side face 101 on the wire stretcher main body 2 and electric rotary machine 7 side, a second side face 102 on the battery 11 side, a back face 103, a plane surface 104, a front face 105 and a bottom surface 106. The rirst side face 101 is made in face-contact with the receiver attaching unit 760 of the electric rotary machine 7. Moreover, the receiver 10 and the electric rotary machine 7 are electrically connected to each other, with a pair of output terminals 107a, 107b formed on the first side face 101 interposed therebetween. The second side face 102 is made in face-contact with the battery 11. Furthermore, the receiver 10 and the battery 11 are electrically connected to each other, with a pair of male-type input terminals 109a, 109b formed on the second side face 102 interposed therebetween.

[0118]

The receiving photodiode 108a is disposed on the back face 103, the receiving photodiode 108b is disposed on the plane surface 104, and the receiving photodiode 108c is disposed on the front face 105.

Since when an overhead wire is stretched and installed between electric poles or the like by using the wire tensioner 1, the plane surface 104 faces downward, it forms a face that is opposed to the receiving photodiode 108b and the transmission-use infrared ray light-emitting diode 96 of the transmitter 9 possessed by the operator on the ground.

When an overhead wire is stretched and installed between electric poles C or the like by using the wire tensioner 1, the wire stretcher main body 2 and the electric rotary machine 7 are rotated with the result that the receiver 10 is sometimes made upside down. Therefore, the receiving photodiode 108a and the receiving photodiode 108c are installed so as to carry out the ON/OFF control of the electric motor of the electric rotary machine 7, at the time when the back face 103 or the front face 105 forms a face that is made face to face with the transmission-use infrared ray light-emitting diode 96 of the transmitter 9 possessed by the operator on the ground.

[0119]

Additionally, the receiver 10 of the present embodiment only carries out the ON/OFF control of the electric motor of the electric rotary machine 7; however, it may be configured so as to further control the forward/reverse rotation or the like of the electric motor.

[0120] (Configuration of Battery)

The battery 11 is used for supplying power to the electric rotary machine 7. As shown in FIG. 1 and FIG. 2, the battery 11 has a substantially rectangular parallelepiped shape, and its upper surface 110 is made in face-contact with the second side face 102 of the receiver 10. A pair of female-type output terminals 112a, 112b are formed on the upper surface 110 of the buttery 11. Since female-type terminals are used as the paired output terminals 112a, 112b, it is possible to prevent the occurrence of an unnecessary electric shock.

[0121]

To the paired female-type output terminals 112a, 112b, a pair of male-type input, terminals 109a, 109b of the receiver 10 are respectively inserted so that the receiver 10 and the battery 11 are electrically connected to each other. Additionally, the battery 11 is a known commercial product, and the detailed explanation thereof will be omitted.

[0122] (Usage Procedure of Wire tensioner)

The following description will discuss one example of a procedure in which by using the wire tensioner 1 having the above-mentioned configuration, a free-end side of an overhead wire or the like is stretched toward an electric pole so that the overhead wire is stretched and installed between electric poles or the like. FIG. 15 is a perspective view showing the usage procedure of the wire tensioner 1. FIG. 16 is a flow chart showing the usage procedure of the wire tensioner 1.

[0123]

In step SI, to the hook portion 500 of the first attaching unit 5 of the wire tensioner 1, the first wire gripper 900 is attached by utilizing the attaching hole 902 formed in the first wire gripper 900. To a hook, portion 800 of a second attaching unit 8, a wire stretcher side attaching end portion 830b of the butt wire 830 is attached by utilizing a hook 832.

[0124]

Next, in step S2, the wire tensioner 1 to which the butt wire 830, the first wire gripper 900 and the second wire gripper 920 are attached is brought to a working position at a high position of the electric pole C by the operator. Thereafter, after an electric pole side attaching end portion 830a of the butt wire 830 has been wound around the electric pole C, it is tightened by a tightening member 834 so that the wire tensioner 1 is attached to the electric pole C.

[0125]

Next, in step S3, the forward/reverse switching switch of the electric motor attached to the electric rotary machine main body 700 is switched to "reverse rotation" side by the operator, and the lever portion 54a of the stop claw 54 formed in the wire stretcher main body 2 is also operated to be switched so that the claw portion 54b of the stop claw 54 is removed from the ratchet-type brake gear 50.

[0126]

Thereafter, the transmitter 9 is operated by the operator, and an ON signal for the electric motor is transmitted from the transmitter 9 to the receiver 10. Upon receipt of the ON signal from the receiver 10, the electric motor is reversely rotated in the electric rotary machine 7 so that the first rotary shaft 30 of the rotation driving mechanism 3 is driven to rotate reversely. Thus, the wind-up side end portion 6b of the first chain 6 serving as the traction unit is drawn from the inside of the wire stretcher main body 2.

[0127]

When the first chain 6 has been drawn from the inside of the wire stretcher main body 2 by a desired length, the transmitter 9 is operated so that an OFF signal for the electric motor is transmitted from the transmitter 9 to the receiver 10 by radio waves. Upon receipt of the OFF signal from the receiver 10, the electric rotary machine 7 stops the electric motor so that the reverse rotation of the first rotary shaft 30 of the rotation driving mechanism 3 is stopped.

[0128]

In a state where the first chain 6 is drawn out, a free end 960a of an overhead wire 960 is gripped by the first wire gripper 900 attached to the wire tensioner 1.

[0129]

Next, in step S4, the forward/reverse rotation switching switch (not shown) of the electric motor installed in the electric rotary machine main body 700 is switched to the "forward rotation" side by the operator and the .lever portion 54a of the stop claw 54 formed on the wire stretcher main body 2 is also switched so that the claw portion 54b of the stop claw 54 is engaged with the ratchet-type brake gear 50 to be locked.

[0130]

Thereafter, the transmitter 9 is operated by the operator so that an ON signal for the electric motor is transmitted from the transmitter 9 to the receiver 10 by radio waves. Upon receipt of the ON signal from the receiver 10, the electric rotary machine 7 has its electric motor forwardly rotated and the first rotary shaft 30 of the rotation driving mechanism 3 is driven to forwardly rotate.

[0131]

Thus, the first chain 6 serving as the traction unit has its wind-up side end portion 6b wound up into the wire stretcher main body 2 so that the first attaching unit 5 is drawn toward the wire stretcher main body 2. As a result, the free end 960a of the overhead wire 960 is drawn toward the electric pole C side, while being raised upward together with the wire tensioner 1, and held thereon.

[0132]

At this time, the operator is allowed to carry out the winding-up operation of the first chain 6 by operating the transmitter 9 at a position apart from the wire tensioner 1. Therefore, even if the gripping between the overhead wire 960 and the first wire gripper 900 should fall off, there is no fear that the first wire gripper 900 might come flying toward the operator to get hurt or that the operator might touch the overhead wire 960 to get an electric shock.

[0133]

When the first chain 6 is wound up into the wire stretcher main body 2 by a desired length, the transmitter 9 is operated by the operator so that the OFF signal of the electric, motor is transmitted from the transmitter 9 to the receiver 10 by radio waves. Upon receipt of the OFF signal from the receiver 10, the electric rotary machine 7 has its electric motor stopped so that the forward rotation of the first rotary shaft. 30 of the rotation driving mechanism 3 is stopped, [0134]

Next, in step S5, determination is made as to whether or not the stretching and installing operation of the overhead wire 960 has been sufficiently carried out. Upon determination that the stretching and installing operation of the overhead wire 960 has been sufficiently executed, the operator on the electric pole C connects the overhead wire 960 with the electric pole C in step S6.

[0135]

On the other hand, upon determination that the stretching and installing operation of the overhead wire 960 has not been executed sufficiently in step S5, the free end 960a of the overhead wire 960 stretched toward the electric pole C side and held thereon is gripped by a second wire gripper 920 attached to the third attaching unit 12, [0136]

Next, the overhead wire 960 is removed from the first wire gripper 900, and the aforementioned step S3 is carried out.

[0137]

Next, after the free end 960a of the overhead wire 960 has been gripped by the first wire gripper 900, the overhead wire 960 is removed from the second wire gripper 920, and the aforementioned step S4 is carried out.

[0138]

Moreover, determination is again made as to whether or not the stretching and installing operation of the overhead wire 960 has been sufficiently carried out. If the determination that the stretching and installing operation of the overhead wire 960 has not been sufficiently executed is again made, operations of step S3 and step S4 are repeatedly carried out on demand.

[0139]

Additionally, in the case when the charge of the battery 11 is run out, by using a ratchet handle 140 shown in FIG. 17 is used in place of the electric rotary machine 7, a rotation driving force is manually applied to the rotation driving mechanism 3. FIG. 17A is a front view of the ratchet handle 140, and FIG. 17B is a plan view thereof.

[0140]

The ratchet handle 14 0 is provided with a ratchet main body-142, a socket portion 124 that is vertically attached to the ratchet main body 142 and a handle portion 148 that, is horizontally attached to the ratchet main body 142.

[0141]

The socket portion 144 is provided with a base portion 144a that is gripped by the ratchet main body 142 and a box wrench portion 144b that is erected the base portion 144a. The box wrench portion 144b has a cylindrical hexagonal pillar shape, and its length L is set to such a dimension as to be longer than a distance from the position of the electric rotary machine insertion hole 268 of the electric rotary machine fixing member 26 disposed on the upper surface 222 of the rotation driving mechanism housing unit 22 of the wire stretcher main body 2 to the upper side end portion 30a of the first rotary shaft 30 of the rotation driving mechanism 3. The shape of an inner peripheral surface 145 of a lateral cross section of the box wrench portion 144b is formed into a hexagonal shape so as to allow the upper side end portion 30a having the hexagonal pillar shape of the first rotary shaft 30 to be fitted thereto.

[0142]

The ratchet handle 140 is inserted from the electric rotary machine insertion hole 268 of the electric rotary machine fixing member 26, and the upper side end portion 30a of the first rotary shaft 30 is fitted to the tip of the box wrench portion 144b. Thus, the handle portion 148 is operated by the operator so as to be reciprocally swung in horizontal directions. Consequently, the box wrench portion 144b is driven to rotate, and the first rotary shaft 30 is also driven to rotate.

[0143]

The wire tensioner 1 having the above-mentioned configuration has its traction unit made of, not a belt-shaped member such as a wire, but a chain; therefore, the first chain 6 can be bent at 90 degrees or can be folded back by 180 degrees at a desired position; thus, the degree of freedom in handling the traction unit becomes higher so that the resulting device is suitably used for a quick stretching work for an overhead wire or the like.

[0144]

Moreover, since the rotation driving mechanism 3 mainly has a structure that is driven to rotate by a driving force of the electric motor of the electric rotary machine 7 serving as a driving source, the rotation speed of the rotation driving mechanism 3 becomes fast. Consequently, the operation for drawing the first attaching unit 5 toward the wire stretcher main body 2 side by winding up the first chain 6 serving as the traction unit into the wire stretcher main body 2 becomes fast. As a result, it is possible to quickly carry out a stretching work of an overhead wire or the like.

[0145]

Furthermore, the operator can execute the winding up operation of the first chain 6 by operating the transmitter 9 from a position apart from the wire tensioner 1. Therefore, even if the gripping between the overhead wire 960 and the first wire gripper 900 should fall off, there is no fear that the first wire gripper 900 might come flying toward the operator to get hurt or that the operator might touch the overhead wire 960 to get an electric shock. Consequently, it is possible to carry out a stretching work for an overhead wire or the like safely.

[0146]

Moreover, the weight of the wire tensioner 1 can be reduced in comparison with a conventional winch or the like, [0147]

Additionally, the present invention is not limited to the above embodiments, but may be modified and changed without departing from the scope of the gist thereof,

EXPLANATION OF REFERENCE NUMERALS

[0148] 1 wire tensioner 2 wire stretcher main body 3 rotation driving mechanism 4 brake mechanism 5 first attaching unit. 6 traction unit (first chain) 6a fixed-side end portion 6b wind-up side end portion 7 driving source (electric rotary machine) 8 second attaching unit 9 transmitter 10 receiver 11 battery 12 third attaching unit 20 casing 22 rotation driving mechanism housing unit 24 brake mechanism housing unit 26 electric rotary machine fixing member 27 intermediate base mounting unit 28 bottom portion 30 first, rotary shaft 30a upper side end portion 30b lower side end portion 32 first spur gear 32a, 36a, 45a, 47a, 49a, 50b, 51a core portion 34 second rotary shaft 34a upper side end portion 34b lower side end portion 36 second spur gear 38 load sheave 38a pocket 38b wheel 40 third rotary shaft 40a upper side end portion 40b lower side end portion 40c male screw portion 40d through hole 41a, 41b bolt with hexagonal hole 42a, 42b spring washer 43 knob 44 split pin 44a leg 45 check washer 46 third spur gear 46a female screw hole core portion 47 disc 49 first brake lining 50 ratchet-type brake gear 50a teeth 51 second brake lining 52 brake plate 53 pinion gear 54 stop claw 54a lever portion 54b claw portion 55 ratchet claw 70 fixing member 70a first horizontal unit 70b second horizontal unit 70c first vertical unit 70d second vertical unit 74 joint bolt ' 90 control box 92 ON switch 93 OFF switch 96 transmission-use infrared ray light-emitting diode 100 receiver main body 101 first side face 102 second side face 103 back face 104 plane surface 105 front face 106 bottom surface 107a, 107b output terminal 108a, 108b, 108c receiving photodiode 109a, 109b input terminal 110 upper surface 112a, 112b output terminal 122 U-letter shape member 124 joint bolt 128 second chain 128a fixing side end portion 128b wire gripper attaching side end portion 140 ratchet handle 142 ratchet main body 144 socket portion 144a base portion 144b box wrench portion 148 handle portion 220 upper surface 222 bottom surface 224 front face 225 first side face 226 back face 227 second side face 230 attaching hole 232, 239 electric rotary machine operation window 236, 238 chain inlet/ outlet opening 240 upper surface 242 bottom surface 244 front face 245 side face 246 back face 248 second expansion unit 250 stop claw operation window 260 ceiling portion 262 front face portion 262a first front face portion 262b second front face portion 263 first side face portion 264 back face portion 265 second side face portion 268 electric rotary machine insertion hole 270 slit 272a, 272b, 272c fixing bolt 274 tightening member 274a tightening side end portion 274b fixing side end portion 276 handle 278 escape groove 278a first escape groove 278b second escape groove 280a, 280b locking edge 310 first rotary shaft holding member 312 upper plate 314 lower plate 500 hook portion 500a base portion 500b tip portion 502 opening/closing member 502a base portion 502b tip p o r t i ο n 504 fixing shaft 520 base portion 522 movable pulley housing unit 526 movable pulley 528 fixing shaft 700 electric rotary machine main body 720 chuck 722 locking protrusion 740 handle 760 receiver attaching unit 780 attaching metal fitting 800 hook portion 800a base portion 800b tip portion 802 opening/closing member 802a base portion 802b tip portion 804 fixing shaft 820 base portion 830 butt wire 830a electric pole side attaching end portion 900 first wire gripper 902 attaching hole 920 second wire gripper 922 attaching hole 960 overhead wire 960a free end C electric pole

Claims (7)

1. CLAIMS What is claimed is:

   1. A wire tensioner comprising: a wire stretcher main body; a first attaching unit; a traction unit for coupling the wire stretcher main body and the first attaching unit to each other; a rotation driving mechanism that is integrally installed in the wire stretcher main body, and is operated so as to draw the first attaching unit toward the wire stretcher main body side by winding up the traction unit into the wire stretcher main body; a driving source which has an electric motor for applying a driving force to the rotation driving mechanism and whose rotation is controlled by a switch; a brake mechanism that is integrally installed near the rotation driving mechanism in the wire stretcher main body, and used for controlling movements of the rotation driving mechanism and/or the first attaching unit; and a second attaching unit installed in the wire stretcher main body, wherein the traction unit is a chain or a belt-shaped member having a predetermined length, and the rotation driving mechanism has a structure that is mainly driven to rotate by a driving force of the electric motor of the driving source through the brake mechanism.
2. 2. The wire tensioner according to claim 1 further comprising: a transmitter for radio controlling the electric motor of the driving source; and a receiver attached to the driving source so as to receive a signal transmitted from the transmitter.
3. 3. The wire tensioner according to claim 1 or 2, wherein the rotation driving mechanism comprises a first rotary shaft; a first spur gear fixed to the first rotary shaft, a second rotary shaft 34, a second spur gear fixed to the second rotary shaft, and a load sheave coupled to the second spur gear, and the brake mechanism comprises a third rotary shaft, a third spur gear threadedly engaged with the third rotary shaft, a brake plate and a pinion gear, and wherein the first spur gear of the rotation driving mechanism and the third spur gear of the brake mechanism are engaged with each other and the second spur gear of the rotat ion driving mechanism and the pinion gear of the brake mechanism are engaged with each other.
4. 4. The wire tensioner according to claim 1 or 2, wherein the wire stretcher main body has a casing that houses the rotation driving mechanism and the brake mechanism, and the casing comprises a rotation driving mechanism housing unit having a substantially longitudinally long rectangular cylindrical shape, which incorporates the rotation driving mechanism, a brake mechanism housing unit having a cylindrical shape, which incorporates the brake mechanism, and an electric rotary machine fixing member for use in fixing the electric rotary machine to the rotation driving mechanism housing unit, and wherein the rotation driving mechanism housing unit and the brake mechanism housing unit are installed side by side so as to be laterally adjacent to each other, the electric rotary machine fixing member having a rectangular shape when seen in a plan view is fixed to an upper surface of the rotation driving mechanism housing unit, and the electric rotary machine fixing member has an electric rotary machine insertion hole formed above the first rotary shaft, so that the electric rotary machine insertion hole allows the electric rotary machine on a chuck side to be inserted and held therein.
5. 5. The wire tensioner according to any one of claims 1 to 4, wherein the first rotary shaft is disposed in the center of the electric rotary machine insertion hole of the electric rotary machine fixing member so as to make the rotary shaft direction is set to a direction that is orthogonal to or intersects with a lateral direction in which the first chain rotates, and the upper end portion thereof is chucked by a chuck of the electric rotary machine serving as the driving source, when the first rotary shaft is driven to rotate.
6. 6. The wire tensioner according to any one of claims 1 to 5, wherein the rotation driving mechanism comprises a first rotary shaft, a first spur gear fixed to the first rotary shaft, a second rotary shaft 34, a second spur gear fixed to the second rotary shaft, and a load sheave coupled to the second spur gear, and the brake mechanism comprises a third rotary shaft, a third spur gear threadedly engaged with the third rotary shaft, a brake plate and a pinion gear, and wherein the first spur gear of the rotation driving mechanism and the third spur gear of the brake mechanism are engaged with each other and the second spur gear of the rotation driving mechanism and the pinion gear of the brake mechanism are engaged with each other so that in response to the rotation of the third spur gear, the disc, the first brake lining, the ratchet-type brake gear and the second brake lining are allowed to rotate the brake plate by a surface-contact frictional force so as to rotate the pinion gear.
7. 7, The wire tensioner according to any one of claims 1 to 6, wherein the brake mechanism comprises a third rotary shaft, a third spur gear threadedly engaged with the third rotary shaft, a brake plate and a pinion gear, as well as a disc that is inserted to the third rotary shaft, a first brake lining, a ratchet-type brake gear, a second brake lining and a stop claw capable of engaging with the ratchet-type brake gear to be locked, and wherein the third rotary shaft is controlled so as not to reversely rotate by the surface contact frictional force exerted among the disc of the brake mechanism, the first brake lining, the ratchet-type brake gear and the second brake lining, as well as by the stop claw that is engaged with the ratchet-type brake gear to be locked.