JP2011080513A - Wire rope tensing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve problems of a hooking structure by inserting a wire to a through-hole provided in a drum as in a conventional tensioner, in which the wire tends to be ruptured due to a rather sharp edge of the through-hole, and since a surplus portion of the wire inserted to the through-hole is also rotated within a body and tends to be caught by a guide roller or the like of a tensing device during winding, a guide roller or the like cannot be provided around the drum, resulting in direct action of the tension of the wire on the drum. <P>SOLUTION: In the tensing device for stretching a wire rope on which a hook of fall prevention safety band of a worker in high-place work, a body hook to be locked to a structure is provided on one end side of a body, and a wire rope winding drive unit and a drum for winding the wire rope, which is rotationally driven by the winding drive unit and is provided with a reverse rotation prevention device, are provided on a side surface of the body. In the drum, an opening for protruding an end portion of the wire rope from the circumferential surface to the side surface of the body through the inside is provided on a rotary shaft. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

The present invention relates to an improvement of a tensioning device that tensions a wire rope for hooking a safety belt for fall prevention when working at a high place on a construction site.

  In high-altitude work at a construction site, workers are required to wear a safety belt for preventing fall. In order to improve the workability of the worker wearing the safety belt for preventing the fall, it is generally performed that a wire rope is stretched between the columns and the hook of the safety belt for the fall prevention is hooked on the wire rope.

  Since the wire rope stretched between the columns needs to be tensioned, the wire rope is stretched through a tensioning device. There are various tensioning devices such as the one shown in Patent Document 1. The tension machine shown in Patent Document 1 is intended to tension a synthetic resin-coated wire, and is tensioned by winding the wire around a drum. The drum is provided with a ratchet wheel to prevent rewinding.

JP 2000-283247 A

  The synthetic resin-coated wire has advantages such as improving the weather resistance against rust and the like and improving the slipping of the hook of the safety belt by coating a metal wire with the synthetic resin. However, when the synthetic resin-coated wire is tensioned with a tensioning device, the synthetic resin coating is liable to break. This is thought to be caused mainly by the fact that the covering member is hooked and tightened at the sharp part of the tensioning device. It was a factor that led to a decline.

In particular, in a structure in which a wire is inserted and hooked into a through-hole provided in a drum like the tension machine shown in Patent Document 1, the edge of the through-hole becomes considerably sharp, and the wire inserted into the through-hole at the time of winding Since the surplus portion of the rotating portion also rotates, the surplus portion is easily caught on the guide roller or the like of the tensioning device. For this reason, a guide roller or the like cannot be provided around the drum, and the rigidity of the tensioning device main body is reduced.

  Therefore, as a result of intensive studies in view of the above problems, the present inventor has achieved the present invention, which is characterized by engaging a hook of a safety belt for preventing an operator from falling at work in high places. In a tensioning device for tensioning a wire rope, a main body hook that is engaged with a structure is provided on one side of the main body, a wire rope winding drive unit is provided on a side surface of the main body, and is rotated by the winding drive unit. A drum that winds up a wire rope provided with a reverse rotation prevention device, and the drum has an opening that projects the end of the wire rope from the peripheral surface through the inside to the side surface of the main body as a rotating shaft. It is in providing.

  The term “main body” as used in the present specification refers to a body having a body hook that is directly or indirectly hooked to a structure such as a support and having a drum for winding a wire rope inside. The drum rotates a winding drive unit provided on the side surface of the main body with a ratchet wrench or the like. A reverse rotation prevention device such as a ratchet gear or a one-way clutch is provided so that the drum does not return when the wire rope is wound and tensioned.

  In the present invention, as a drum structure, an opening for projecting the end of the wire rope from the peripheral surface through the inside to the side surface of the main body is provided on the rotating shaft. This is to prevent the end portion of the wire rope from being present inside the main body, and to prevent the portion of the wire rope inserted through the drum from moving inside the main body as the drum rotates when winding the wire rope. .

  The rotation of the drum may be directly rotated by a winding drive unit provided on the side of the main body. However, it is preferable to reduce the torque of the winding drive unit via a gear or the like to improve workability. Further, the insertion portion of the drum peripheral surface through which the end portion of the wire rope is inserted is made as smooth as possible so that the wire rope is not damaged. In particular, in the present invention, since the wire rope is inserted from the peripheral surface of the drum in the axial direction thereof, the insertion can be facilitated by forming an insertion portion having a width in the axial direction on the peripheral surface. For example, a slit is provided in the axial direction of a cylinder constituting the peripheral surface of the drum, or the peripheral surface is configured by a peripheral surface constituent member such as a plurality of pipes or bars. By providing a plurality of slits through which the peripheral surface of the drum is configured or inserted through the peripheral surface constituent member, there is no need to adjust the through-hole through which the end portion of the wire rope is inserted at a predetermined position as in the prior art.

In order to adopt a structure in which the end portion of the wire rope protrudes from the side surface of the main body, in the present invention, the drum rotation shaft is formed in a cylindrical shape so as to protrude from the opening portion of the end portion. For this reason, the end part side of an opening part can be made into the cone shape which made the diameter large, and the end part of a wire rope can be made easy to pass. Moreover, you may provide the guide for letting the edge part of a wire rope pass inside the drum.

The wire rope tensioning device according to the present invention has a structure in which the end portion of the wire rope passes through the opening of the rotating shaft end portion from the peripheral surface of the drum and comes out from the side surface of the main body. Since there is no end portion, the wire rope can be easily wound up. This is also effective when removing the tensioned wire rope. Moreover, since the guide roller of the wire rope can be provided in the vicinity of the drum, the winding of the wire rope can be stabilized by the guide roller. In addition, the wire rope can be more reliably tensioned depending on the position of the guide roller with respect to the drum.

(A) is a top view which shows one Example of the wire rope tensioning apparatus which concerns on this invention, (b) is a side view of (a). Example 1 It is a perspective view which shows the state which penetrates a wire rope end part to the drum of the wire rope tensioning apparatus which concerns on this invention. It is a side view which shows the state which winds up a wire rope with the wire rope tensioning apparatus which concerns on this invention. It is a side view which shows an example of the use condition of the wire rope tensioning apparatus which concerns on this invention.

The wire rope tensioning apparatus according to the present invention solves the above-described problems by adopting a structure in which an end portion of a wire rope to be engaged with the drum at the time of winding is projected from the side surface of the main body.

  1A and 1B show an embodiment of a wire rope tensioning device 1 according to the present invention, in which a drum 3 for winding a wire rope W around a main body 2 and a winding drive for rotating the drum 3 are shown. The structure 4 is provided with a ratchet gear 5 and a ratchet pawl 51 for preventing reverse rotation of the drum 3, and a body hook 6 is provided on one side of the body 2. In this example, the driven gear 31 is provided in the drum 3 and meshed with the drive gear 41 provided in the winding drive unit 4 to lighten the winding of the wire rope W. A guide roller 7 for the wire rope W is provided on the other side of the main body 2.

  When the wire rope tensioning apparatus 1 according to the present invention tensions the wire rope W, the wire rope end WE is passed from the peripheral surface of the drum 3 to the opening 33 at the end of the rotating shaft as shown in FIG. It is characterized by protruding from the two sides. For this reason, the peripheral surface of the drum 3 is constituted by a peripheral surface constituting member 32 made of six bars, and the wire rope end portion WE is inserted through these gaps.

  Thus, when the wire rope W is attached to the main body 2 and the drum 3 is rotated, the portion inserted through the drum 3 can be caught by the bar 32 of the drum 3 and wound up. As shown in FIG. 3, the wire rope W is wound up so that the wire rope end WE is out of the side surface of the main body 2, so that the wire rope W can be smoothly wound and tensioned without interfering with the guide roller 7 or the like. Can do. Moreover, since the guide roller 7 can be provided in the vicinity of the drum 3, even when the wire rope W is wound up by the drum 3 when the wire rope W is tensioned, the winding of the wire rope W by the drum 3 is not achieved. The ratio can be increased to make it difficult to come off. Furthermore, it is possible to avoid the tension of the wire rope W from directly affecting the drum 3.

  As shown in FIG. 4, when the wire rope W is tensioned between the struts P, the main body hook 6 is first locked to one strut P. Next, the free end WE of the wire rope W fixed to the other support P is passed through the opening 33 of the rotary shaft from the gap of the peripheral surface constituting member 32 forming the peripheral surface of the drum 3 and protrudes from the side surface of the main body 2. . At this stage, the wire rope end WE is pulled by hand to make it stretched to some extent. Then, as shown in the figure, the take-up drive unit 4 is rotated by the ratchet wrench R to be surely tensioned.

In order to remove the tensioned wire rope W from the tension device 1, the ratchet pawl 51 is removed from the ratchet gear 5 to freely rotate the drum 3. Even when the wire rope W is pulled and removed from the drum 3, the wire rope end WE is on the side of the main body 2, so that it can be smoothly rewound and the workability becomes extremely high.

DESCRIPTION OF SYMBOLS 1 Wire rope tensioning device 2 Main body 3 Drum 31 Driven gear 32 Circumferential surface component 33 Opening part 4 Winding drive part 41 Drive gear 5 Ratchet gear 51 Ratchet claw 6 Main body hook 7 Guide roller W Wire rope WE Wire rope end P Post R ratchet wrench

Claims (2)

  In a tensioning device for tensioning a wire rope that engages a safety belt hook for preventing a worker from falling when working at a high altitude, a main body hook for locking to a structure is provided on one side of the main body, and a wire rope is provided on a side surface of the main body. And a drum that winds a wire rope that is rotationally driven by the winding drive unit and includes a reverse rotation prevention device. The drum has an end portion of the wire rope. A wire rope tensioning device having an opening on a rotating shaft that protrudes from a peripheral surface to the side of a main body through the inside.   The wire rope tensioning device according to claim 1, wherein the drum has a circumferential surface constituted by a plurality of circumferential surface constituting members.

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