JP2008196118A - Rope tensioning device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that there are many restrictions such that the number of times of winding of a rope around a winding drum is determined so that the length of the rope can be freely adjusted after a tensioning force is exerted by a rope tensioner for use in a covering wire rope, particularly, a winding drum system, on ground that there is a problem about the magnitude of the rope tensioning force in a conventional cam-lock type rope tensioning device. <P>SOLUTION: This rope tensioning device comprises: a rope restraining sheave mechanism which is composed of an input shaft for applying the tensioning force to the rope, and a pair of rope restraining plates moving in the direction of being separated from/brought into contact with each other depending on the direction of the rotation of the input shaft, and which makes the rope-to-be-tensioned inserted between the pair of rope restraining plates; a rotating shaft for locking; an inner lock which is fixed to the rotating shaft for locking, and which has an outer peripheral surface eccentric to the rotating shaft; and an outer lock which has an inner peripheral surface approximately concentric with the outer peripheral surface. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a rope tensioning device, and more particularly to a rope tensioning device used for safety in a construction site or the like.

  When working at a high place, the rope for hanging the hook of the safety belt for preventing the fall, which is effective when the worker falls, must be tensioned with appropriate tension. In addition, fences are installed in the open areas of high places so that people do not fall, but in building construction, ropes are often used to substitute for fences. Even in this case, in order to exert the effect, the rope must be stretched with an appropriate tension. In addition, since the interval of installing the rope is not constant, the length of the rope must be adjustable. When using a fiber rope, a rope tensioner of a cam lock type, and when using a covered wire rope, a rope tensioner of a winding cylinder type that wraps a rope around a winding drum or tensions a truck, or a tensioner that tightens a truck load. The vessel is known. However, there is a problem with the magnitude of the rope tension in the cam lock type rope tensioner, and the rope tensioner used for the covered wire rope, especially the winding drum type, exerts the tension, and the rope length can be adjusted freely. There are many restrictions, such as the number of times the rope is wound around the winding drum, and there is a problem that it takes time for the facility. It is easy, and there is a problem when the rope is deformed and reused.

Moreover, there exists a thing shown by patent document 1 as an apparatus which tensions the master rope by rotation of a lever.
JP 2002-317559 A

  The present invention eliminates the above-mentioned drawbacks.

  In view of the above problems, an object of the present invention is to provide a rope tensioning device that can shorten the rope facility time and that is less likely to damage the coating with little deformation of the rope.

The rope tensioning device of the present invention comprises an input shaft that applies tension to the rope, and a pair of rope restraining plates that move in a direction in which they are separated from and in contact with each other according to the rotation direction of the input shaft. A rope restraining sheave mechanism that allows a rope to be tensioned to pass through, a locking rotary shaft, an inner lock that is fixed to the locking rotary shaft and has an outer peripheral surface that is eccentric to the shaft, and the outer peripheral surface substantially A rotating wedge type rope comprising an outer lock having a concentric inner peripheral surface and passing a rope fed from the rope restraint sheave mechanism through a gap between the outer peripheral surface of the inner lock and the inner peripheral surface of the outer lock And a locking mechanism.
,

  The rope tensioning device of the present invention includes an input shaft that applies tension to the rope, and a pair of rope restraining plates that move in directions away from and in contact with each other according to the rotation direction of the input shaft. A rope restraint sheave mechanism that allows a rope to be tensioned to be inserted between the plates, and a rope restraint that is brought into contact with the outer periphery of the rope restraint plate in order to prevent the rope restraint plate from rotating in a direction opposite to the rope entrainment direction. And a plate rotation stopping mechanism.

  According to the rope tensioning device of the present invention, the facility time of the tension rope can be shortened and the tension rope can be reliably held. In addition, the tension rope is not particularly susceptible to damage to the coating, and the tension rope is less deformed, which is advantageous for reuse and reinstitution of the tension rope.

  Embodiments of the present invention will be described below with reference to the drawings.

  In the figure, 1a is a frame, 1b is a frame, 2 is an input shaft, 3a is a small gear, 3b is a small gear, 4a is a large gear, 4b is a large gear, 5 is a screw shaft, 6a is a rope restraining disk, 6b is Rope restraint disk, 7 is guide roller, 8a is cam, 8b is cam, 9a is spring, 9b is spring, 10 is outer lock, 11 is inner lock, 12 is lock shaft, 13 is upper shaft, 14 is connecting pin , 15 is a tension rope.

  1 to 4, the rope tensioning device of the present invention connects a connecting pin 14 to a facility partner such as a pillar (not shown) using a shackle (not shown), and one of the tension ropes 15 is not shown. The other end of the tension rope 15 is suspended on the rope restraining disks 6a and 6b as shown in FIGS. 5 and 6.

  At this time, the axial interval between the rope restraining disks 6a and 6b is expanded in advance to the outside, and at the same time, the inner lock 11 is rotated clockwise by the lock shaft 12 so that the rotating wedge type locking function does not work. The tension rope 15 is allowed to freely pass through the rotary wedge type rope lock mechanism.

  The opposite inner surfaces of the rope restraining discs 6a and 6b are angles such that the rope 15 does not slide down when the tension rope 15 is passed, and does not slip outward even when the tension rope 15 is sandwiched and tightened. In this case, the inclined surface is such that the facing distance decreases toward the inner periphery.

  If the input shaft 2 incorporated in the shaft holes of the frames 1a and 1b is rotated clockwise by a ratchet wrench (not shown), the small gears 3a and 3b integrally fixed to the input shaft 2 with a key or the like are rotated. Thereby, the large gears 4a and 4b meshed with the small gears 3a and 3b are rotated counterclockwise.

  Further, the screw shaft 5 is integrally fixed to the center of the large gears 4a, 4b with a key or the like. Both ends of the screw shaft 5 are fitted in the shaft holes of the frames 1a and 1b, the left screw provided at the center of the rope restraining disk 6a on the both sides of the center part, and the right provided at the center of the rope restraining disk 6b. A pair of left and right screws that are screwed to the screws are provided. Therefore, when the screw shaft 5 rotates, the rope restraining disks 6 a and 6 b try to rotate together with the screw shaft 5.

  In this case, the rope restraining discs 6a and 6b rotate together with the screw shaft 5 because the rope restraining discs 6a and 6b do not have resistance to prevent the rotation when the tension rope 15 is not passed.

  However, when the tension rope 15 is passed, if the resistance such as the pulling force of the tension rope 15 is greater than the screwing resistance of the screw shaft 5 and the rope restraining disks 6a and 6b, the rope restraining disks 6a and 6b are It cannot rotate with the screw shaft 5.

  Accordingly, when the screw shaft 5 is rotated in this state, the rope restraining discs 6a and 6b are screwed with the screws of the screw shaft 5, so that depending on the direction of rotation of the screw shaft 5, they are moved toward each other and are tensioned ropes. 15 is tightened from both sides.

  When the screw shaft 5 is further rotated, the tightening force of the rope restraining disks 6a and 6b is increased, and the frictional resistance force between the tension rope 15 and the rope restraining disks 6a and 6b is increased in proportion thereto.

  If the rotational force of the input shaft 2 is further increased in a state where the pulling force of the tension rope 15 is larger than the frictional resistance force of the tension rope 15 and the rope restraining disks 6 a and 6 b, the tension rope 15 finally becomes larger than the pulling force of the tension rope 15. And the rope restraining disks 6a and 6b increase in friction resistance, and the rope restraining disks 6a and 6b rotate together with the screw shaft 5.

  When the following formula is established, the tension rope 15 is wound while being tensioned together with the rope restraining disks 6a and 6b by the rotational force input to the input shaft 2.

  1) Pulling force of the tension rope 15 ≦ Friction resistance force between the tension rope 15 and the rope restraining disks 6a and 6b.

  2) Tightening force of the rope restraining discs 6a and 6b for generating the frictional resistance force between the tension rope 15 and the rope restraining discs 6a and 6b satisfying the expression 1) above, the screw obtained from the rotational force of the input shaft 2 Tightening force of the rope restraining disks 6a and 6b from the shaft 5.

  3) Torque of the screw shaft 5 that generates the tightening force of the rope restraining disks 6a and 6b from the screw shaft 5 obtained from the rotational force of the input shaft 2 that satisfies the above expression 2) ≦ Screw by the pulling force of the tension rope 15 Shaft 5 torque.

  4) Torque of the screw shaft 5 due to the pulling force of the tension rope 15 ≦ Torque of the screw shaft 5 generated by the rotational force input to the input shaft 2.

  In order to satisfy the above formulas 1) to 4) and to efficiently exhibit the function of the rope tensioning device, the inclination angle of the opposing inner surfaces of the rope restraining discs 6a and 6b, the restraining discs 6a and 6b and the screw shaft 5 Determine the left and right screw leads to be provided.

  A guide roller 7 of a rope feed mechanism is provided, which is rotatably incorporated in the input shaft 2 and is sandwiched inside the rope restraining disks 6a and 6b and obtains its own rotational force by contacting the rope restraining disks 6a and 6b. Thus, the tension rope 15 wound by the rope restraint sheave mechanism is sent out from the rope restraint sheave mechanism between the outer lock 10 and the inner lock 11 of the rotary wedge type rope lock mechanism.

  The guide roller 7 rotates in contact with the outside of the tension rope 15 wound between the rope restraining disks 6a and 6b, and sends out the tension rope 15 at a higher speed than the tension rope 15 entrainment speed. It plays a role in preventing loosening in the mechanism. The guide roller 7 has a width that does not contact the rope restraining disks 6a and 6b when the rope restraining disks 6a and 6b are spread outward.

  Also, as a rope restraining disk rotation restraining mechanism, the input shaft 2 is given counterclockwise rotational force by the springs 9a, 9b to rotate the cams 8a, 8b always in contact with the outer circumferences of the restraining disks 6a, 6b. Incorporate as much as possible. An inclination (general cam lock) that acts to widen the mutual center interval when the rope restraining disks 6a, 6b are to rotate clockwise (counter-winding direction) at the outer peripheral contact portions of the cams 8a, 8b. Shape), the rotation of the rope restraining discs 6a and 6b in the anti-winding direction is restrained, and conversely, when the rope restraining discs 6a and 6b are going to rotate counterclockwise (winding direction), the mutual center The inclination does not have the function of increasing the interval so that the rotation of the rope restraining disks 6a and 6b in the winding direction is not hindered.

  A general ratchet type reverse rotation stopping mechanism or the like can also be used.

  A lock shaft 12 in which a rotary wedge-type rope lock mechanism is incorporated in the shaft holes of the frames 1a and 1b, an inner lock 11 fixed to the lock shaft 12 with a key or the like, and a lock shaft 12 are rotatable. The outer lock 10 and the tension rope 15 incorporated in the outer lock 10 and the frames 1a and 1b are integrated to prevent the rotation of the rope lock mechanism when the rope lock mechanism is rotated in the anti-winding direction. The upper shaft 13 penetrates the 10 shaft holes and is incorporated in the shaft holes of the frames 1a and 1b.

  The outer peripheral surface of the inner lock 11 and the inner peripheral surface of the outer lock 10 are arc-shaped surfaces that are eccentric to the lock shaft 12, and the two arc-shaped surfaces are substantially concentric with each other, and a gap through which the rope 15 is passed is formed therebetween. The outer peripheral surface of the inner lock 11 and the inner peripheral surface of the outer lock 10 are uniformly spaced so that the tension rope 15 is tightened and locked when the inner lock 11 is turned counterclockwise (lock direction). The shape is small.

  Further, when the inner lock 11 of the rope lock mechanism of the rotating wedge type is rotated clockwise, the cams 8a and 8b on the side that comes into contact with the surface of the inner lock 11 are provided with semi-arc-shaped protruding portions, thereby the cams 8a and 8b. Is rotated clockwise so that the restraining function of the cams 8a, 8b can be released. By rotating the inner lock 11 clockwise, the rope restraining disk restraining function of the cams 8a, 8b is released and the rope restraining disk 6a is released. , 6b can rotate freely and the tensioning rope 15 can be removed from the rope tensioning device.

  The tension rope 15 delivered from the rope delivery mechanism is a rotary wedge type rope lock mechanism in which the lock function is not activated by rotating the inner lock 11 clockwise beforehand in order to pass the tension rope 15 through the rope tensioning device. It passes through the outer lock 10 and is sent to the outside of the rope tensioning device.

  When the tension rope 15 is tensioned and the lock shaft 12 is rotated counterclockwise, that is, in the locking direction, the tension rope 15 is locked by the rotary wedge type rope lock mechanism, and the tension rope 15 can be kept in a tension state.

  As described above, the rope tensioning device of the present invention passes through the tension rope 15 in a substantially U shape as shown in FIG. 6 and applies a rotational force in the winding direction to the input shaft 2 by a ratchet wrench (not shown). The tension rope 15 can be wound with a tension force corresponding to the rotational force given by the work, and the tension rope 15 can be sent out of the tensioner in a non-tensioned state by the function of the rope feed mechanism and the rope restraining disk rotation stop mechanism. Because there is no restriction such as the number of times the rope is wound around the winding drum as in the case of a winding drum rope tensioner, the facility time can be shortened, and the tension rope 15 can be bent gently. Since the upper ropes do not contact or overlap each other, the tension rope 15 is not particularly susceptible to damage to the covering, and the tension rope 15 is not deformed. Re-use of without tension rope 15, it is suitable for the re-establishment.

  In the rope tensioning device of the present invention, when the rope restraining disk of the rope restraining sheave mechanism cannot rotate due to the resistance from the rope due to the rotational force from the input shaft, the screw restraint disk is rotated because the screw shaft is rotating. A pair of left and right screws facing each other on the screw shafts that are fitted to each other are moved inwardly to pinch the rope and rotate. If it still does not rotate, the rope restraining disk will further pinch the rope and finally begin to rotate. The wound rope is sent to the rope lock mechanism while being kept in tension by the function of the rope feed mechanism, and then locked by the rotary wedge type rope lock mechanism.

  In addition, the rope lock mechanism can reliably lock the rope even in the event of a sudden rise in rope tension due to a fall accident or the like. Even in the case of rope removal, the rope can be taken out simply by releasing the function of the rope lock mechanism, and the working time can be shortened. Moreover, since the rope is bent gently, there is little deformation of the rope.

It is a top view of the Example of the rope tensioning apparatus of this invention. It is a front view of the Example of the rope tensioning apparatus of this invention. The front view of the rope restraint sheave mechanism part of the rope tension apparatus shown in FIG. The side view except the frame 1a of the rope restraint sheave mechanism part shown in FIG. The top view of a rope tensioner which shows the path | route of a tension rope. The internal structure figure of a rope tensioner which shows the arrangement | sequence of a tension rope path | route, a rope restraint sheave mechanism, a rope restraint disk rotation stop, a rope sending mechanism, and a rotary wedge type rope lock mechanism.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1a Frame 1b Frame 2 Input shaft 3a Small gear 3b Small gear 4a Large gear 4b Large gear 5 Screw shaft 6a Rope restraint disk 6b Rope restraint disk 7 Guide roller 8a Cam 8b Cam 9a Spring 9b Spring 10 Outer lock 11 Inner lock 12 Lock shaft 13 Upper shaft 14 Connecting pin 15 Tension rope

Claims (2)

The rope is composed of an input shaft that applies tension to the rope and a pair of rope restraining plates that move away from and in contact with each other according to the rotation direction of the input shaft. The rope to be tensioned is inserted between the pair of rope restraining plates. A rope-restraint sheave mechanism,
A rotary shaft for locking, an inner lock fixed to the rotary shaft for locking and having an outer peripheral surface eccentric to the shaft, and an outer lock having an inner peripheral surface substantially concentric with the outer peripheral surface. A rope lock mechanism of a rotating wedge method in which the rope fed from the rope restraint sheave mechanism is passed through the gap between the outer peripheral surface and the inner peripheral surface of the outer lock;
A rope tensioning device characterized by comprising: The rope is composed of an input shaft that applies tension to the rope and a pair of rope restraining plates that move away from and in contact with each other according to the rotation direction of the input shaft. The rope to be tensioned is inserted between the pair of rope restraining plates. A rope-restraint sheave mechanism,
A rope restraint plate rotation restraining mechanism that is brought into contact with the outer periphery of the rope restraint plate in order to restrain the rotation of the rope restraint plate in the direction opposite to the rope winding direction;
A rope tensioning device characterized by comprising:

Images