JP2000283247A - Wire stretcher of synthetic resin coated wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply stretch and remove a wire to which a life line in a high lift work place is moored. SOLUTION: This wire stretcher includes a pair of side plates 1a, 1b, a fitting shaft 2 at the tips of the side plates 1a, 1b, to which a hook 30 is fitted, a drum 5 rotatably provided at the rear ends of the side plates 1a, 1b, in which a through hole 10 for passing a synthetic resin coated wire is bored, a ratchet wheel 15 fixed coaxially with the drum 5, a ratchet 20 meshing with the ratchet wheel 15 to regulate the rotation of the drum 5 only in the direction of taking up the synthetic resin coated wire, a spring for energizing the ratchet 20 in the direction of meshing with the ratchet wheel 15, and a releasing device 27 for holding the meshing in the release state. By this arrangement, the synthetic resin coated wire can be tensed and fixed only by inserting the wire in the through hole 10 and rotating the drum 5 in the take-up direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tensioning machine for tensioning a synthetic resin-coated rope provided for hanging a safety belt (lifeline) at a high place on a construction work site.

[0002]

2. Description of the Related Art In high places at construction work sites, in order to prevent danger such as falling down, a wire in which a synthetic resin such as vinyl chloride is coated from column to column (hereinafter referred to as a coated wire).
Is tensioned, and one end of a standardized safety belt (lifeline) is slidably hooked to this covered wire with a hook to ensure worker safety.

FIG. 5 shows the state of attachment of a conventional covering wire stretched for a safety belt at a high place. A covering wire 50 having a wire socket 51 attached to the tip of a mounting piece 53 of one of the pillars 52 is shown. Shackle 54
While connecting using, the frame type turnbuckle 55 is connected to the mounting piece 53a of the other pillar 52a using the shackle 54a, and the end of the coating wire 50 is inserted into the frame type turnbuckle 55 and turned back. After using a plurality of wire clips 56 to fasten the folded portion with a ratchet handle and fix it, the frame-type turnbuckle 55 is tightened to tension the covered wire.

[0004]

The conventional means for tensioning the coated wire 50 uses a shackle 54, a frame-type turnbuckle 55, and a wire clip 56, so that a large number of tools are required to tension the wire. The number of steps increases, and the work time is also increased. Accordingly, a large number of workers are required to stretch the covering wire 50, and the danger of the workers at high places is increased accordingly.

[0005] Further, the conventional tensioning means for the covering wire 50 requires a large space between the column 52 and the wire clip 56a, and the surplus portion 50a hanging down from the wire clip 56a of the folded covering wire 50 has a worker 5 '.
The surplus portion 50a was cut off because it took up the work space in which 7 acted and hindered the work.

[0006] Therefore, once used covering wire 50
Could not be diverted to a work place with a longer span than the previous work place, which was uneconomical.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to simplify the means for tensioning a covered wire, thereby speeding up the tensioning operation and making it economically advantageous.

[0008]

SUMMARY OF THE INVENTION The present invention comprises a pair of parallel side plates, a mounting shaft for attaching a hook fixed to a front end of the side plates, and a composite shaft rotatably provided at a rear end of the side plates. A drum having a through hole through which the resin-coated wire is inserted, a ratchet wheel coaxially fixed to the drum, and meshing with the ratchet wheel to rotate the drum only in a winding direction of the synthetic resin-coated wire A ratchet that regulates the ratchet, a spring that urges the ratchet in the direction of engagement with the ratchet wheel, and a release device that holds the engagement in a released state against the spring. By inserting the synthetic resin-coated wire into the through-hole and rotating the drum in the winding direction, the synthetic resin-coated wire can be tensioned and fixed. Only in tension to release the meshing of Chet it is released, stretched and removal of the synthetic resin-coated wire is to be easy.

Further, the center portion of the outer peripheral direction of the drum at the opening end of the through hole is formed as an edge, and the axial direction of the drum at the opening end is formed on an inclined surface along the peripheral edge. The loosening due to the slip is prevented by the edge and the fraying breakage due to the swing at the open end of the synthetic resin-coated wire is prevented.

Further, a nut into which a socket of a ratchet wrench is fitted coaxially is fixed to the outer surface of the ratchet wheel, and the synthetic resin-coated wire is wound by a winding tool. I tried not to be.

Further, a hook is mounted on the mounting shaft, so that the tensioning machine can be mounted on the pillar or the mounting piece of the pillar with one touch.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

FIGS. 1 to 4 show an embodiment of a synthetic resin-coated wire tensioner according to the present invention.
Are a pair of parallel elliptical side plates 1a and 1b,
a, a mounting shaft 2 for mounting a hook 30 provided at the front end of the side plate, and a synthetic resin covered wire 40 (hereinafter referred to as a covered wire) rotatably provided inside the rear end of the side plates 1a, 1b. , A ratchet wheel 15 provided on the outside of the side plate 1a coaxially with the drum 5, and a ratchet 20 juxtaposed to the ratchet wheel 15 as main members.

The mounting shaft 2 composed of bolts is composed of side plates 1a, 1
b, and two spacers 3a, 3b located between the side plates 1a, 1b, and the connecting portion 30a of the hook 30 sandwiched between the spacers 3a, 3b are inserted into the side plate 1
It is fixed by a nut 4 with a split pin on the outside of a and 1b. A large hook 30 is rotatably mounted on the mounting shaft 2.

The hook 30 is a well-known type that opens and closes by pushing an opening / closing arm 30b urged to a closed state by a spring, but is not limited to the illustrated one.

The cylindrical drum 5 has flanges 6 on both side edges, and has rotating shafts 7a and 7b provided with male threads at the end portions on both side surfaces, and integrally protrudes therefrom. 7a, 7b are rotatably mounted through bearing holes in the side plates 1a, 1b.

A nut 8 with a spring pin is fixed to the tip of one rotating shaft 7b, and the other rotating shaft 7a
, A ratchet wheel 15 is coaxially fixed, and a nut 9 with a spring pin is fixed to a tip end of a rotating shaft 7 a that penetrates the ratchet wheel 15 and protrudes to the outside. When the covering wire 40 is tensioned, the nut 9 is fitted with a ratchet-type wrench socket of a tensioning tool, and the drum 5 and the ratchet wheel 15 rotate cooperatively by operating the tool.

In the center of the drum 5, a through hole 10 for inserting the covering wire 40 is formed perpendicular to the axis of the drum 5, and the drum 5 at the opening end of the through hole 10 is formed.
Is formed at an acute edge 11 at the center in the outer peripheral direction, and the axial direction of the open end of the drum 5 is formed on an inclined surface 12 along the peripheral edge.

The ratchet wheel 15 is positioned coaxially with the drum 5 outside the drum 5 via the side plate 1a, and is mounted so that the inclined surfaces 17 of the teeth 16 are oriented in the direction in which the covering wire 40 is wound and rotated.

The ratchet 20 has a claw 21 and an arm 22 that opens at a predetermined angle, is rotatably mounted on a mounting shaft 23, is prevented from falling off by a nut 24 with a split pin, and is juxtaposed near the ratchet wheel 15. ing.

The ratchet mechanism composed of the ratchet 20 and the ratchet wheel 15 regulates the rotation of the drum 5 only in the winding direction of the coating wire 40 by engaging the claws 21 and the teeth 16 and projects the drum 5 outside the side plate 1a. The ratchet 20 is urged in the direction of engagement by a spring 26 having one end fixed to the fixed pin 25 provided and the other end attached to the arm 22 of the ratchet 20, whereby the drum 5 is inadvertently released by releasing the engagement. Prevents reversal.

Further, the ratchet 20 is provided with a releasing device 27 mainly composed of a hook capable of holding the engagement of the ratchet mechanism in a released state. By engaging the release device 27 with a locking pin 28 protruding outside the side plate 1a against the urging force of the spring 26, the engagement is maintained in a released state, and the rotation of the drum 5 can be maintained free. It has become.

When using the tensioning machine K of the present embodiment configured as described above, as shown in FIG. 3 and FIG. The large-sized hook 30 at the tip of the tensioning machine K is hung on the fixed attachment piece 32 and attached.

Then, the covering wire 40 is moved along the beam 33.
Mounting piece 32a for the other pillar 31a
To a connecting wire 40 having a wire socket 35 attached to the tip end thereof, using a shackle 34, and setting a rear end portion 40a of the coating wire 40 to a state in which a ratchet mechanism works, that is, a tensioning machine in which the ratchet 20 is set in an engaged state. A covering wire 40 is inserted between the columns 31 and 31a by passing through the through hole 10 of the K drum 5. Then, the socket is fitted to the nut 9 on the outer surface of the ratchet wheel 15 and the drum 5 is rotated in the winding direction using a ratchet type wrench (not shown), so that the coating wire 40 is
Operation to rewind.

When the drum 5 is wound up by about one rotation, the covering wire 40 is in a tension state, and is tensioned in a direction substantially perpendicular to the axis of the drum 5. Therefore, the edge 11 of the drum 5 bites into the coating layer of the coating wire 40 and is caught.

The covering wire 40 stretched between the columns 31 and 31a is fixed without slipping on the drum 5 and without loosening because the drum 5 is prevented from reversing by the ratchet mechanism.

Even if the fixed covering wire 40 is swung and rubs against the opening end of the through hole, stress concentration is reduced by the inclined surface of the opening end, and the opening of the covering wire due to the swing is reduced. Fraying at the edges is difficult to break.

When the work of fixing the covering wire 40 is completed, the winding tool such as a socket or a ratchet wrench is not detached from the tensioning machine K and is made slimmer. Tensile machine K is pillar 4
Because it is installed at 0 o'clock, it does not take up space in the workplace,
Does not hinder worker behavior.

Further, the surplus portion 40a of the covering wire 40 fixed to the tensioning machine K is also located near the pillar 40 and does not hinder the work, so that it may be wound around the tensioning machine K without being cut off.

When the installed covering wire 40 is to be removed, the release device 27 is hooked on the hooking pin 28 against the urging force of the spring 26. This allows the ratchet 20
Is released, the rotation of the drum 5 becomes free, and the covering wire 40 is immediately relaxed. The covering wire 40 may be pulled straight out of the through hole 10.

[0031]

The present invention is embodied in the form described above and has the following effects.

The tensioning machine of the present invention can be attached to the pillar with one touch by a hook attached to the tensioning machine, and a covering wire is inserted through a through hole of a drum of the tensioning machine.
The sheath wire can be tensioned and fixed by simply rotating the drum, and the ratchet can be released with a single touch by releasing the ratchet. I do.

[0033] Therefore, it is possible to reduce the number of workers for the covering wire stretching work and to shorten the dangerous work time at a high place.

Moreover, since the attached tensioning machine is small and installed on the pillar, it does not hinder the work, and the surplus portion of the covering wire fixed to the tensioning machine does not restrict the action of the worker. There is no need to cut out.

Therefore, the coated wire used once can be reused in a place where the working span is long, which is economically advantageous.

[Brief description of the drawings]

FIG. 1 is a front view showing a tensioner for a synthetic resin-coated wire according to the present invention.

FIG. 2 is a plan view of the tensioner of FIG. 1;

FIG. 3 is a perspective view showing a use state of the tensioning machine of FIG. 1;

FIG. 4 is an explanatory view showing a use state of the tensioning machine of FIG. 1;

FIG. 5 is an explanatory view showing a conventional example.

[Explanation of symbols]

1a, 1b side plate, 2 mounting shaft, 5 drum, 9 nut, 10 through hole, 11 edge, 12 inclined surface, 15
Ratchet wheel, 20 ratchet, 26 spring, 27 release device, 30 hook, 40 synthetic resin coated wire,

Claims (4)

[Claims] 1. A pair of parallel side plates, a mounting shaft for attaching a hook fixed to a front end of the side plate, and a through hole through which a synthetic resin-coated wire rotatably provided at a rear end of the side plate is inserted. And a ratchet wheel fixed coaxially with the drum, and a ratchet that meshes with the ratchet wheel to restrict the rotation of the drum only in the winding direction of the synthetic resin-coated wire.
A synthetic resin comprising: a spring that urges the ratchet in the direction of engagement with the ratchet wheel; and a release device that holds the engagement in a released state against the spring. Insulation wire tensioner. 2. The drum according to claim 1, wherein a central portion of the opening end of the through hole in the outer peripheral direction of the drum is formed as an edge, and an axial direction of the drum at the opening end is formed as an inclined surface along a peripheral edge. A tensioner for a synthetic resin-coated wire as described above. 3. The tensioner for a synthetic resin-coated wire according to claim 1, wherein a nut to which a socket of a ratchet wrench is fitted coaxially is fixed to an outer surface of the ratchet wheel. 4. A tensioner for a synthetic resin-coated wire according to claim 1, wherein a hook is attached to the attachment shaft.