WO2023003007A1

WO2023003007A1 - Wire tensioner

Info

Publication number: WO2023003007A1
Application number: PCT/JP2022/028146
Authority: WO
Inventors: 航介岡本
Original assignee: 株式会社永木精機
Priority date: 2021-07-20
Filing date: 2022-07-20
Publication date: 2023-01-26
Also published as: KR20240033235A; TW202306271A; JPWO2023003007A1

Abstract

A wire tensioner (1) comprises: a drum (10); a wire (5); a locking mechanism (16); a handle (9); and a reverse-winding prevention member (14). The drum (10) is rotatable. The wire (5) is fixed to the drum (10), and is wound around the drum (10) as the drum (10) rotates in a direction A. The locking mechanism (16) is capable of preventing the drum (10) from rotating in a direction B which is a direction opposite to the direction A. The handle (9) is operated to rotate the drum (10) in the direction A or the direction B. By coming into contact with the wire (5), the reverse-winding prevention member (14) prevents the drum (10) from rotating, with the wire (5) completely unwound from the drum, in the direction B.

Description

wire tensioner

The present invention relates to a wire tensioner.

Conventionally, wire tensioners used for overhead line construction, for example, have been known. Patent Literature 1 discloses this type of wire tensioner.

The wire tensioner of Patent Document 1 has a drum for winding the wire. The wire tensioner has a ratchet handle capable of switching the rotational driving direction of the drum. This wire tensioner is provided with a brake gear for limiting the rotation direction of the drum.

JP-A-11-103513

In the wire drawing machine, when the wire is completely unwound from the drum, for some reason such as operator error, the wire may be wound by rotating the drum in the opposite direction. In this case, the brake gear does not substantially function to limit the rotational direction of the drum, so the wire tensioner may operate unintendedly.

The present invention has been made in view of the above circumstances, and its purpose is to prevent reverse winding that causes unintended operation of the wire tensioner.

Means and Effects for Solving Problems

The problem to be solved by the present invention is as described above. Next, the means for solving this problem and its effect will be explained.

According to the aspect of the present invention, a wire tensioner having the following configuration is provided. That is, this wire tensioning device includes a drum, a linear member, a reverse rotation prevention mechanism, a handle, and a reverse winding prevention member. The drum is rotatable. The linear member is fixed to the drum and wound around the drum as the drum rotates in the first direction. The anti-reverse mechanism can prevent the drum from rotating in a second direction opposite to the first direction. The handle is manipulated to rotate the drum in the first direction and the second direction. The reverse winding prevention member prevents the drum from rotating in the second direction in a state in which the linear member is completely unwound from the drum by coming into contact with the linear member or the drum. .

As a result, it is possible to prevent the linear member from being wound on the drum in a direction opposite to the normal direction. As a result, it is possible to prevent the wire tensioner from operating in a way that is not expected by the operator.

The above wire tensioner is preferably configured as follows. That is, the reverse winding prevention member is supported so as to be changeable between a braking posture for braking the linear member and an open posture for releasing the braking. When the drum rotates in the second direction with all the linear members unwound from the drum, the reverse winding prevention member is pushed by the linear member and rotates to assume the braking posture. .

As a result, it is possible to realize a simple configuration that prevents reverse winding.

The wire tensioner described above preferably has the following configuration. That is, the wire tensioning device includes a guide member that guides the linear member along the winding tangential direction when the drum rotates in the first direction. The reverse winding prevention member is attached to the guide member.

As a result, since the reverse winding prevention member is provided on the path along which the linear member is guided, the reverse winding prevention member reliably acts on the linear member to prevent reverse winding.

The wire tensioner described above preferably has the following configuration. That is, when the drum rotates in the second direction with all the linear members unwound from the drum, the reverse winding prevention member is positioned at a fixed position between the drum and the linear member, or Rotation of the drum is prevented by hooking on the drum. When the drum rotates in the first direction from a state in which the linear member is completely unwound from the drum, the diameter of the reverse winding prevention member increases as the linear member is wound around the drum. allow the drum to rotate by being pushed to the outer periphery in response to the

BRIEF DESCRIPTION OF THE DRAWINGS The perspective view which shows the whole structure of the wire tensioner which concerns on one Embodiment of this invention. FIG. 5 is a cross-sectional view for explaining the operation of the reverse winding prevention member when the drum rotates in direction A from the state in which the wire is completely unwound from the drum; FIG. 5 is a cross-sectional view for explaining the operation of the reverse winding prevention member when the drum rotates in the direction B from the state in which the wire is completely unwound from the drum; Sectional drawing explaining the structure of the wire tensioner of a modification. FIG. 12 is a cross-sectional view for explaining the operation of the reverse winding prevention member when the drum rotates in the direction A from the state in which the wire is completely unwound in the modified example; FIG. 11 is a cross-sectional view for explaining the operation of the reverse winding prevention member when the drum rotates in the direction B from the state in which the wire is completely unwound in the modified example;

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing the overall configuration of a wire tensioning device 1 according to one embodiment of the present invention. FIG. 2 is a cross-sectional view for explaining the operation of the reverse winding prevention member 14 when the drum 10 rotates in the direction A from the state in which the wire 5 is completely unwound from the drum 10 . FIG. 3 is a cross-sectional view for explaining the operation of the reverse winding prevention member 14 when the drum 10 rotates in the opposite B direction.

The wire tensioning device 1 of this embodiment shown in FIG. 1 can wind the wire (linear member) 5 around the drum 10 .

The wire tensioner 1 includes a frame 2, a handle 9, and a drum 10.

The frame 2 has two

base plates

3 and 4. Each

base plate

3, 4 is a plate-like member. The two

base plates

3 and 4 are arranged with an appropriate gap in the thickness direction. A connecting member 6 is supported at the end of the frame 2 . By attaching, for example, a hook to the connecting member 6, the wire tensioning device 1 can be fixed to another member.

The drum 10 is rotatably supported between the

base plates

3,4. An end of the wire 5 is fixed to the drum 10 .

The wire 5 has flexibility. Although the wire 5 may have any configuration, a metal wire is used in this embodiment. A known wire gripper (not shown) is attached to the wire 5 via, for example, a pulley. The wire gripper can grip and fix a member to be tensioned by the wire tensioner 1 .

By rotating the drum 10 with respect to the frame 2 in the direction of the arrow A, the wire 5 can be pulled and wound around the outer periphery of the drum 10. The wire 5 can be unwound from the drum 10 by rotating the drum 10 in the B direction opposite to the A direction. The A direction corresponds to the first direction and the B direction corresponds to the second direction.

Although not shown, the shaft of the drum 10 extends through the base plate 3. An input gear 11 and an input wheel 15 are fixed to this shaft. The input gear 11 and the input wheel 15 rotate together with the drum 10 .

The handle 9 is an elongated rod-shaped member. The handle 9 is rotatably supported around the rotation axis of the drum 10 . The handle 9 is rotatable relative to the input gear 11 . A base portion of the handle 9 is formed in a hollow shape, and an input gear 11 is arranged therein.

A ratchet member 12 is attached to the base of the handle 9 . The ratchet member 12 is arranged close to the outer periphery of the input gear 11 . The ratchet member 12 can mesh with teeth formed on the outer circumference of the input gear 11 .

The ratchet member 12 is rotatably supported relative to the handle 9. The ratchet member 12 is formed with a knob 12a. An operator can switch the operating position of the ratchet member 12 by operating the knob 12a. The ratchet member 12 has two pawls. One of the two pawls can be selectively meshed with the input gear 11 according to the operating position of the ratchet member 12 .

A spring (not shown) is built into the handle 9. The spring exerts a biasing force in a direction to bring one of the two pawls closer to the input gear 11 according to the operating position of the ratchet member 12 .

A regulating gear 7 and a locking member 8 are arranged near the base plate 3 .

The regulating gear 7 is arranged between the base plate 3 and the handle 9. The regulating gear 7 is rotatably supported with respect to the axis of the drum 10 .

A one-way clutch (not shown) is provided between the regulating gear 7 and the input gear 11 . This one-way clutch is connected when the input gear 11 rotates in the A direction with respect to the regulation gear 7 and transmits the rotation of the input gear 11 to the regulation gear 7 . When the input gear 11 rotates in the B direction with respect to the regulating gear 7 , the rotation is not transmitted to the regulating gear 7 because the one-way clutch is disengaged.

The locking member 8 is arranged close to the outer circumference of the regulating gear 7 . Lock member 8 is supported by base plate 3 so as to be rotatable. A lock claw is formed at the tip of the lock member 8 . The lock pawl can mesh with teeth formed on the outer circumference of the regulating gear 7 .

A spring (not shown) is attached to the lock member 8 . This spring applies a biasing force to the lock member 8 in a direction to bring the lock pawl closer to the regulating gear 7 .

A locking mechanism (reverse prevention mechanism) 16 is configured by the regulating gear 7 and the locking member 8 . This lock mechanism 16 allows the regulation gear 7 to rotate in the A direction with respect to the frame 2 and prevents it from rotating in the B direction. The locking mechanism 16 can hold the drum 10 so as not to rotate in the B direction even if the tension of the wire 5 is applied to the drum 10 .

A knob 8a is formed on the lock member 8. The knob 8 a is operated to unlock the lock mechanism 16 . By operating the knob 8a by the operator, the locking member 8 is forcibly rotated in a direction against the spring force, and the engagement between the locking claw and the regulating gear 7 can be released.

When one of the two pawls of the ratchet member 12 is meshed with the input gear 11, by rotating the handle 9 in the P direction, the operating force is transmitted to the drum 10 via the input gear 11, and the drum 10 can be rotated in the A direction. Since the one-way clutch is engaged, the regulating gear 7 rotates in the A direction together with the input gear 11, but this rotation is not blocked by the locking mechanism 16 composed of the locking member 8. When the handle 9 is rotated in the Q direction, the operating force of the handle 9 in that direction is not transmitted to the input gear 11 . Therefore, by alternately reciprocally rotating the handle 9 in the P direction and the Q direction with an appropriate angular stroke, the drum 10 can be gradually rotated in the A direction to wind the wire 5 .

When the claw on the opposite side of the two claws of the ratchet member 12 is meshed with the input gear 11, by rotating the handle 9 in the Q direction, the operating force is transferred to the drum 10 via the input gear 11. to rotate the drum 10 in the B direction. Since the one-way clutch is disengaged, the regulating gear 7 does not rotate in the B direction together with the input gear 11 . When the handle 9 is operated to rotate in the P direction, the operating force of the handle 9 in that direction is not transmitted to the input gear 11 . Therefore, by alternately reciprocatingly rotating the handle 9 in the Q direction and the P direction with an appropriate angular stroke, the drum 10 can be gradually rotated in the B direction to unwind the wire 5 .

The input wheel 15 rotates integrally with the drum 10 and the input gear 11. A plurality of concave portions are formed on the outer circumference of the input wheel 15 so that a person can easily rotate the input wheel 15 with a finger. When the wire 5 is not under tension, the wire 5 can be quickly wound onto the drum 10 by gripping the input wheel 15 with fingers and rotating it. Instead of recesses, handles may be provided, for example similar to wing bolts.

A guide member 13 is provided on the frame 2 . The guide member 13 is a member that is bent to form a U-shaped plate. The guide member 13 is fixed so as to connect the two

base plates

3 and 4 of the frame 2 to each other. The wire 5 passes inside the guide member 13 .

A reverse winding prevention member 14 is attached to the guide member 13 . The reverse winding prevention member 14 is a member that is bent into a U-shape. The reverse winding prevention member 14 is arranged inside the guide member 13 .

An appropriate space is formed between the guide member 13 and the reverse winding prevention member 14 . Hereinafter, the space between the guide member 13 and the reverse winding prevention member 14 may be referred to as wire passage space. The wire 5 pulled out from the drum 10 passes through the wire passing space.

The wire passage space is offset to one side with respect to a straight line passing through the rotation center of the drum 10 so as to guide the wire 5 along the winding tangential direction when the drum 10 rotates in the direction A. be. The reverse winding prevention member 14 is rotatably supported with respect to the guide member 13 via a support shaft. Therefore, the shape of the wire passage space changes according to the rotation of the reverse winding prevention member 14 . A portion of the wire passage space can be made narrower than the outer diameter of the wire 5 by rotating the reverse winding prevention member 14 .

Next, reverse winding of the wire 5 with respect to the drum 10 will be described.

In the wire drawing device 1 of the present embodiment, for example, the wire 5 is completely unwound from the drum 10 by grasping the wire 5 with the lock member 8 unlocked and pulling it to the limit in the N direction in FIG. state.

From this state, the wire 5 can be wound around the drum 10 by rotating the drum 10 again. In terms of design, the rotation direction of the drum 10 when winding the wire 5 is determined as the A direction. However, if the ratchet member 12 of the handle 9 is operated in the wrong position or the input wheel 15 is rotated in the wrong direction, the operator may wind the wire 5 by rotating the drum 10 in the B direction. In this specification, winding the wire 5 in the normal direction on the drum 10 is called normal winding, and winding the wire 5 in the opposite direction to the normal direction is sometimes called reverse winding.

Consider a case where the wire 5 is wound in the opposite direction due to the rotation of the drum 10 in the B direction, and the wire 5 is stretched with strong tension by operating the handle 9 . When the operator releases the handle 9, the tension of the wire 5 causes the drum 10 to rotate in the A direction. Since the input gear 11 rotates in the direction A along with this, the one-way clutch is engaged, and the regulating gear 7 also rotates integrally with the input gear 11 . However, when the regulating gear 7 rotates in the A direction, the locking of the locking mechanism 16 by the locking member 8 does not work.

After all, when the tension of the wire 5 causes the drum 10 to rotate in the B direction, the rotation is free. Therefore, the rotation of the drum 10 under the tension of the wire 5 is not prevented, and the handle 9 may rotate with a strong force in conjunction with the rotation of the drum 10 .

In this regard, the reverse winding prevention member 14 of the present embodiment is such that even if the wire 5 is wound around the drum 10 by the above reverse winding, the reverse winding prevention member 14 that is pushed by the wire 5 and rotates does not interfere with the guide member 13. A wire 5 is clamped between them and braking is performed. Therefore, the above reverse winding can be substantially prevented.

The case of normal winding in this embodiment is shown in FIG. 2, and the case of reverse winding is shown in FIG. From FIG. 2 onward, the state in which the angle of the handle 9 is different from that in FIG. 1 is drawn in order to clearly show the wire 5 in the vicinity of the reverse winding prevention member 14 .

In the normal winding of FIG. 2, the reverse winding prevention member 14 is substantially parallel to the guide member 13 along the wire 5, so the guide member 13 does not interfere with the winding of the wire 5. . In the reverse winding of FIG. 3, the wire 5 wound around the drum 10 pushes the reverse winding prevention member 14 to rotate and contact the wire 5 at the portion indicated by the symbol X. As shown in FIG. As a result, the wire 5 is frictionally braked between the guide member 13 and the reverse winding prevention member 14, so that reverse winding of the wire 5 is prevented.

The reverse winding prevention member 14 automatically changes its posture by being pushed by the wire 5 as the wire 5 route changes depending on whether the wire 5 is normally wound or reversely wound. Therefore, only reverse winding can be prevented while normal winding of the wire 5 on the drum 10 is permitted.

In this way, the wire tensioning device 1 of the present embodiment can prevent reverse winding due to operator error by means of the reverse winding prevention member 14, so convenience is greatly enhanced.

As shown in FIG. 3, in the reverse winding prevention member 14, the dimension L1 of the portion closer to the drum 10 than the support shaft is larger than the distance L2 between the support shaft and the braking portion (L1>L2). As a result, the wire 5 can be strongly braked by the reverse winding prevention member 14 using the principle of leverage.

As described above, the wire tensioning device 1 of this embodiment includes the drum 10, the wire 5, the lock mechanism 16, the handle 9, and the reverse winding prevention member 14. Drum 10 is rotatable. The wire 5 is fixed to a drum 10 and wound around the drum 10 as the drum 10 rotates in the A direction. The locking mechanism 16 can prevent the drum 10 from rotating in the B direction, which is the opposite direction to the A direction. A handle 9 is operated to rotate the drum 10 in the A and B directions. The reverse winding prevention member 14 contacts the wire 5 to prevent the drum 10 from rotating in the direction B when the wire 5 is completely unwound from the drum 10 .

Thereby, it is possible to prevent the wire 5 from being wound on the drum 10 in a direction opposite to the normal direction. As a result, it is possible to prevent the wire tensioner 1 from operating in a way that is not expected by the operator.

In the wire tensioning device 1 of the present embodiment, the reverse winding prevention member 14 can be changed between a braking posture in which the wire 5 is braked as shown in FIG. 3 and an open posture in which braking is released as shown in FIG. Supported. When the drum 10 rotates in the B direction with the wire 5 completely unwound from the drum 10, the reverse winding preventing member 14 is pushed by the wire 5 and rotates to take the braking posture shown in FIG.

The wire tensioning device 1 of this embodiment includes a guide member 13 that guides the wire 5 so as to generally follow the winding tangential direction (W direction in FIG. 2) when the drum 10 rotates in the A direction. The reverse winding prevention member 14 is attached to the guide member 13 .

As a result, since the reverse winding prevention member 14 is provided in the route along which the wire 5 is guided, the reverse winding prevention member 14 can reliably act on the wire 5 to prevent reverse winding.

Next, a modification of the above embodiment will be described. FIG. 4 is a cross-sectional view illustrating the configuration of a wire tensioning device 1x of a modification. In the description of this modified example, the same or similar members as those of the above-described embodiment are denoted by the same reference numerals in the drawings, and the description thereof may be omitted.

In the wire tensioner 1x of the modified example shown in FIG. 4, the end of a belt (linear member) 5x is attached to the drum 10 instead of the wire. The belt can be made of any material, but polyamide resin is used in this variant. A polyamide resin having electrical insulation properties is suitable for use in electric wire construction, for example. The outer peripheral surface of the cylindrical shaft portion of the drum 10 is ground flat, and the belt is fixed to this flat portion.

A reverse winding prevention member 14x is attached to the frame 2 of the wire tensioner 1x. The reverse winding prevention member 14x is arranged between the

base plates

3 and 4 of the frame 2. As shown in FIG. The reverse winding prevention member 14x is formed in a plate shape, and its ends are rotatably supported by the

base plates

3 and 4. As shown in FIG.

A spring (not shown) is attached to the reverse winding prevention member 14x. The spring biases the reverse winding prevention member 14x so that the tip of the reverse winding prevention member 14x approaches the shaft portion of the drum 10. As shown in FIG.

Consider a state in which the belt 5x is completely unwound from the drum 10 as shown in FIG. When the drum 10 is rotated in the direction A from the state shown in FIG. 4, the reverse winding prevention member 14x slides on the belt 5x spirally wound around the shaft and gradually retreats. FIG. 5 shows the state immediately before the reverse winding prevention member 14x contacts the outer circumference of the belt 5x. Therefore, when the drum 10 is rotated in the direction A to wind the belt 5x, the reverse winding prevention member 14x does not interfere with the rotation.

When the drum 10 is rotated in direction B from the state shown in FIG. 4, the connecting portion between the shaft portion of the drum 10 and the belt 5x is caught by the tip of the reverse winding prevention member 14x as shown in FIG. Therefore, reverse winding can be prevented by the reverse winding prevention member 14x.

As described above, in the wire tensioning device 1x of the present embodiment, the reverse winding prevention member 14x is arranged along the outer peripheral surface of the drum 10. When the drum 10 rotates in the B direction with the belt 5x completely unwound from the drum 10, the rotation of the drum 10 is prevented by the reverse winding prevention member 14x being caught at the fixing point between the drum 10 and the belt 5x. . When the drum 10 rotates in the A direction, the belt 5x is wound around the drum 10 and pushed to the outer periphery as the diameter increases, thereby allowing the drum 10 to rotate.

As a result, it is possible to realize a simple configuration that configures reverse winding.

Although the preferred embodiment and modification of the present invention have been described above, the above configuration can be modified as follows, for example. A single change may be made, or multiple changes may be made in any combination.

The reverse winding prevention member 14 shown in FIG. 1 can be changed to, for example, a block-shaped member instead of the U-shaped plate-shaped member. Also, the corners of the reverse winding prevention member 14 that contacts the wire 5 are rounded to prevent the wire 5 from being damaged during braking.

As shown in FIG. 6, the reverse winding prevention member 14x of the modified example contacts both the belt 5x and the shaft of the drum 10 to prevent the rotation of the drum 10 in the B direction. This reverse winding prevention member 14x can be modified so that it contacts only the shaft portion of the drum 10 to prevent rotation, as described below. For example, an appropriate concave portion is formed on the outer peripheral surface of the shaft portion of the drum 10 so that the tip of the reverse winding prevention member can be caught. When the drum 10 attempts to rotate in the direction B in the state of FIG. 4, the tip of the reverse winding prevention member enters the recess and is caught, thereby preventing the rotation. When the drum 10 rotates in direction A, the belt 5x closes the concave portion, so that the rotation of the drum 10 is not prevented by the reverse winding prevention member.

A belt 5x can be applied to the wire tensioner 1 of the embodiment shown in FIG. The wire 5 can be applied to the modified wire tensioner 1x shown in FIG.

The guide member 13 may be formed integrally with the

base plates

3 and 4.

It is possible to omit the input wheel 15 and change the configuration so that the drum 10 is driven only by the handle 9.

The

wire tensioners

1, 1x of the present embodiment can be used for tensioning linear members such as electric wires, communication cables, and various ropes. The

wire tensioners

1 and 1x can also be used for temporary fixing of welding, fastening of cargo, movement of heavy objects, and the like.

1, 1x wire tensioner 5 wire (linear member)
5x belt (linear member)
9 handle 10 drum 13

guide member

14, 14x reverse winding prevention member 16 lock mechanism (reverse rotation prevention mechanism)

Claims

a rotatable drum;
a linear member fixed to the drum and wound around the drum when the drum rotates in a first direction;
a reverse rotation prevention mechanism capable of preventing rotation of the drum in a second direction opposite to the first direction;
a handle operable to rotate the drum in the first direction and the second direction;
a reverse winding prevention member that prevents the drum from rotating in the second direction with the linear member completely unwound from the drum by coming into contact with the linear member or the drum;
A wire tensioner comprising:
The wire tensioner according to claim 1,
The reverse winding prevention member is supported so as to be changeable between a braking posture for braking the linear member and an open posture for releasing the braking,
When the drum rotates in the second direction with all the linear members unwound from the drum, the reverse winding prevention member is pushed by the linear member and rotates to assume the braking posture. A wire tensioner characterized by:
The wire tensioner according to claim 2,
a guide member that guides the linear member along a winding tangential direction when the drum rotates in the first direction;
A wire tensioner, wherein the reverse winding prevention member is attached to the guide member.
The wire tensioner according to claim 1,
When the drum rotates in the second direction from a state in which the linear member is completely unwound from the drum, the reverse winding prevention member is a fixed portion between the drum and the linear member, or a fixed portion of the drum. prevents rotation of the drum by being caught by
When the drum rotates in the first direction from a state in which the linear member is completely unwound from the drum, the diameter of the reverse winding prevention member increases as the linear member is wound around the drum. A wire tensioning device characterized in that it allows the rotation of the drum by being pushed to the outer periphery in response to the rotation of the drum.