JPH077823A - Drum frame with brake - Google Patents

Abstract

PURPOSE:To simplify the structure of a drum frame and reduce the manufacturing cost of the frame and, at the same time, to easily mount a rotating drum on the frame and easily adjust the braking force by generating the braking force by utilizing a shaft supporting the rotating drum. CONSTITUTION:When a rotating drum 10 is mounted on a drum frame with brake, both end sections of a shaft 16 are put on a pair of frames 12 and 14 which support the shaft 16 after the shaft 16 is passed through the drum 10, brake plates 34 and 36, and rubber plates 76 and a shaft movement inhibiting member 154 is fitted to the protruded end section of the shaft 16. Consequently, the interval between the frames 12 and 14 and the pressing forces of the brake plates 34 and 36 against the rubber plates 76 are adjusted by means of the outer pipe 148 engaged with one end section of the shaft 16 by threads and the member 154 fitted to the other end of the shaft 16. Namely, when the pipe 148 is rotated, the adjustment of the interval between the frames 12 and 14 and the braking force can be performed through one action. Therefore, a drum frame with brake which has a simple structure and can be manufactured inexpensively and on which a rotating drum can be easily mounted and the braking force of which can be easily adjusted is obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drum stand with a cable-feeding brake which is used in a work for extending a communication cable, a suspension wire or the like.

[0002]

2. Description of the Related Art Conventionally, a drum stand with a brake for feeding a cable has been used in a work of extending a communication cable, a suspension wire or the like (hereinafter, these are collectively referred to as a cable).
The brake of this drum stand with a brake has a band wound around the outer peripheral surface of the rotary drum or the outer peripheral surface of the rotating body that rotates integrally with the rotary drum, and pulling on the band suppresses the rotation of the rotary drum and operates the handle. The rotation of the rotary drum is suppressed by pressing the brake plate against the outer peripheral surface of the rotary drum.

[0003]

However, all of these have a problem that the structure is complicated and therefore the manufacturing cost is high and the work of attaching the rotary drum is troublesome.

Further, since it is difficult to adjust the braking force, it is difficult to keep the tension of the cable constant, and the slack of the cable becomes large. In particular, since the communication cable is stretched at a relatively low position, when the cable is extended across a road in an urban area, slack in the cable may hinder traffic or the distance between the utility pole and the utility pole ( When the span is long, the slack of the cable becomes excessive, and there is a problem that it may come into contact with other cables. To solve these problems,
The hanging metal method was adopted and many loosening monitoring workers were assigned.

As shown in FIG. 5, the work by the hanging metal construction method means that the parent rope 310 is stretched before the wire drawing work, and the parent rope 310 has 4 to 5 spans in the span. It is a work in which a cable 314 is passed through the gold wheel 312, and the wire 312 is hung. According to this work, the cable 31
Since the slack of No. 4 only occurs between the adjacent gold wheels 312, the slack can be reduced as compared with the case where the parent rope and the gold wheel are not provided (shown by the one-dot chain line). However, if the parent rope 310 is stretched,
There is a problem in that the work is troublesome and the working time is long because it is necessary to hang the gold wheel 312 on.

On the other hand, if a large number of cable slack monitoring workers are arranged in the middle of the extended wire route, the worker on the cable feeding side can finely adjust the braking force based on the communication of the monitoring workers. Therefore, excessive slack of the cable can be avoided in advance. However, there is a problem that a large number of workers are required.

In view of the above circumstances, it is an object of the present invention to obtain a drum mount with a brake which has a simple structure, a low manufacturing cost, a rotary drum can be easily attached, and a braking force can be easily adjusted. It was made as.

[0008]

In order to solve this problem, a drum mount with a brake according to the present invention comprises: (a) a pair of frames arranged on both sides in the axial direction of a rotary drum around which a cable is wound; (B) a first brake plate that is provided on at least one of both ends of the rotary drum in the axial direction and has a friction surface perpendicular to the axial direction, and that rotates integrally with the rotary drum; A second brake plate fixed so as to face the first brake plate, and (d) a rotary drum, a first brake plate and a second brake plate, and both end portions of the first brake plate and the first brake plate. A shaft supported by a pair of frames to rotatably support the rotary drum and the first brake plate, and one end of which axially immovably engages with one of the pair of frames; Of the axis A brake force that is provided at the end and acts on the other of the pair of frames to reduce the distance between the pair of frames to press the first brake plate against the second brake plate and suppress the rotation of the rotary drum. And a frame spacing reduction device for generating.

[0009]

When the rotary drum is attached to the drum mount with brake of the present invention, the shaft is inserted through the rotary drum, the first brake plate and the second brake plate, and both ends are supported by the pair of frames. Further, one end of the shaft is immovably engaged with one of the frames in the axial direction, while the frame spacing reduction device acts on the other frame at the other end of the shaft. This allows the rotary drum to rotate about the axis, and when the frame interval reduction device is operated, the pair of frame intervals can be narrowed. If the frame interval is narrowed, the first brake plate that rotates integrally with the rotary drum and the second brake plate fixed to the frame are pressed against each other, and a braking force that suppresses the rotation of the rotary drum is generated.

Since this braking force can be accurately adjusted by the frame interval reducing device, it is possible to perform the wire-drawing work while maintaining the tension applied to the cable at an appropriate value.

[0011]

As described above, since the drum mount with brake of the present invention uses the shaft for supporting the rotary drum to generate the braking force, it has a simple structure and can be manufactured at low cost. At the same time, the work of attaching the rotary drum can be easily performed in a short time. Further, when the drum mount with brake of the present invention is used for the cable drawing work, proper tension can be applied to the cable and slack can be satisfactorily avoided. Therefore, it is not necessary to perform work by the hanging metal construction method, and it is not necessary to lay a parent rope or hang a gold wheel on the parent rope, which makes the work safe and easy, and saves work time. It can be shortened. Moreover, since the number of workers who monitor the degree of cable slack can be reduced, the number of personnel can be reduced.

[0012]

An embodiment of the present invention will be described in detail with reference to the drawings. In FIGS. 1 and 2, 10 is a rotating drum, 12 and 14 are frames, and 16 is a shaft. The frames 12 and 14 are arranged on both sides of the rotary drum 10 in the axial direction, and support the shaft 16 that rotatably supports the rotary drum 10. Also, both frames 12, 1
4 is connected by two connecting pipes 18.

The rotary drum 10 includes discs 20 and 22 and a cylinder 24.
And one end of the cylinder 24 is fitted into an annular groove formed in the disc 20 and is fixed by four bolts 26. Similarly, the other end of the cylinder 24 is fixed to the disc 22 by four bolts 28. Further, central holes 30 are formed at the centers of the circular plates 20 and 22 of the rotary drum 10, and brake plates 34 and 36 are attached to the central holes 30, respectively.

The brake plate 34 has a disc 38 having a hole for axial passage in the center thereof, a cylinder 40 having an inner peripheral surface coinciding with the hole and vertically welded to the disc 38, and a disc. 38 and four arms 42 that are vertically and radially welded to each other, and by fitting the tube 40 into the central hole 30,
Disc 20 of rotating drum 10 and disc 38 of brake plate 34
And are parallel. Further, while the rotary drum 10 is rotating, the arm 42 and the bolt 26 are engaged with each other so that the brake plate 34 and the rotary drum 10 rotate integrally. When the brake plate 34 is attached, no matter what the relative position between the bolt 26 and the arm 42, the rotation of the rotary drum 10 causes the bolt 26 to come into contact with the arm 42. become.

Similarly, the brake plate 36 includes a disc 44 and a cylinder 4.
6, arm 48, and the cylinder 46 is attached to the rotary drum 10 by being fitted in the central hole 30 of the disc 22. Disk 22 and disk 44 are parallel,
During rotation of the rotary drum 10, the arm 48 and the bolt 28
And are engaged.

The frames 12 and 14 are generally trapezoidal in shape. The frame 12 includes an outer frame 50, two columns 52 fixed to the outer frame 50, and a slide 54 slidably attached to the column 52.

The two pillars 52 are arranged at a distance from each other, and a plurality of pin holes 56 are formed at equal intervals in an example. The slide 54 is generally in the shape of a rectangular tube, and both side plates 58 are extended so as to sandwich the two columns 52 from both sides, while an upper plate 61 and a lower plate 62 are provided between the two columns 52. The vertical movement of the slide 54 is guided by the column 52 when the slide 54 is sandwiched between the columns. Further, two pin holes 63 are formed in each of the extended ears of the side plates 58 at the same intervals as the pin holes 56.

A jack 64 is provided on the lower plate 62 of the slide 54.
Ram 66 of the above is in contact. The jack 64 is a hydraulic type, and is provided with a sump, a manual pump, etc., which are not shown. The ram 66 is raised by supplying the hydraulic oil in the oil sump to the shuck 64 by the operation of the manual pump, and is lowered by returning the hydraulic oil to the oil sump. The slide 54 is pushed up while being guided by the pillar 52, and one of the pin holes 56 of the pillar 52 and the pin hole 6 of the slide 54 is pushed.
When 3 and 3 are matched, both pin holes 56, 63
Insert a pin (not shown) into the slide 54
Can be fixed to.

A shaft support cylinder 70 is welded to the slide 54, and the shaft support cylinder 70 has flanges 72 and 74 at both ends thereof.
Is equipped with. Two rubber plates 76 are attached to the inner flange 72 of the frame 12, with a hole 77 formed in the center of the rubber plate 76 and a hole of the shaft support cylinder 70 aligned. The rubber plate 76 is a commercially available product having a thickness of 6 mm, and since one plate lacks elastic deformability, two plates are stacked. Further, a countersunk bolt 78 is used to attach the rubber plate 76 so that the head of the bolt does not project due to wear of the rubber plate 76. The countersunk bolt 78 penetrates the rubber plate 76 and the flange 72, and is screwed into a nut 80 fixed to the flange 72.

A table 86 is provided at the center of the lower end of the outer frame 50, and the jack 64 is fixed to the table 86.
Further, pipe support cylinders 88 are fixed to both ends, through holes are formed in the upper portions of both pipe support cylinders 88, and nuts 90 are respectively welded. A handle 92 is attached to the upper end of the outer frame 50 to facilitate carrying the frame 12.

Similarly, the frame 14 includes outer frames 94, 2 and
A column 96 of a book and a slide 98 are provided, and a shaft support cylinder 100 is welded to the slide 98. Two pillars 9
6, a pin hole 102 is formed and a slide 98 is slidably attached. The slide 98 is moved up and down along the pillar 96 by the jack 110,
With the pin hole 106 of the slide 98 and the pin hole 102 of the pillar 96 aligned, a pin (not shown) is inserted and fixed to the pillar 96.

The shaft support cylinder 100 has flanges 11 at both ends thereof.
4, 116, and two rubber plates 118 are fixed to the flange 114 inside the frame 14. Pipe support cylinders 128 are fixed to both ends of the lower end of the outer frame 94. Nuts 130 are welded to the upper portions of the pipe support cylinders 128, respectively.

The two connecting pipes 18 are fitted into the pipe supporting cylinders 88 and 128 at both ends thereof, and the nut 90,
By bolting a bolt (not shown) to 130,
It is fixed to the frames 12 and 14. Frames 12, 14
Are connected by the connecting pipe 18, the stability of the drum mount is increased.

A thread 140 is formed at one end of the shaft 16 and a flange 142 is welded to the tip thereof. No thread is formed on the middle portion and the other end portion 144 of the shaft 16, and a plurality of pin holes 146 are formed in a row along the axial direction at equal intervals. An outer cylinder 148 having a thread groove on the inner peripheral surface is screwed into the thread 140. A handle 150 is attached to the tip of the outer cylinder 148 to facilitate rotation of the outer cylinder 148 together with the handle 152 fixed to the flange 142. Axis 16 is frame 1
The outer cylinder 148 is located outside the frame 12 and is supported by the flanges 2 and 14 so that the tip end thereof can come into contact with the flange 74.

A shaft movement blocking member 154 is attached to the other end 144 of the shaft 16. The shaft movement blocking member 154 is the cylinder 1.
56 and a flange 158, and a pin hole 166 is formed in the cylinder 156. The shaft movement prevention member 154 is fitted to the shaft 16, and the pin 168 is inserted in a state where any one of the pin holes 146 of the shaft 16 and the pin hole 166 of the shaft movement prevention member 154 are aligned, and the shaft movement prevention member 154 is It is fixed to the shaft 16.

At one end of the shaft 16, the end surface of the outer cylinder 148 abuts the flange 74 of the frame 12, and the other end 14
4, the flange 158 of the shaft movement preventing member 154 abuts the flange 116 of the frame 14. In this state, when the outer cylinder 148 is screwed to the right in FIG. 2, the end surface of the outer cylinder 148 pushes the flange 74, and the reaction force of the outer cylinder 148 causes the flange 158 of the shaft movement blocking member 154 to move the flange 1 to the flange 1.
Since the frame 16 is pushed, the gap between the frames 12 and 14 is narrowed, and the brake plate 34 and the rubber plate 76, and the brake plate 36 and the rubber plate 118 are pressed against each other.

Along with the rotation of the rotary drum 10, a frictional force corresponding to the pressing force is generated between the brake plates 34, 36 and the rubber plates 76, 118, and a friction torque is generated by the bolts 26, 36.
Is transmitted to the rotary drum 10 via 28, and the rotary drum 1
The rotation of 0 is suppressed. Therefore, the frames 12, 1
By narrowing the interval of 4 and increasing the pressing force, the rotary drum 1
The braking force that suppresses the rotation of 0 can be increased.

The radius of the contact portion between the flange 74 and the end surface of the outer cylinder 148 is smaller than the radius of the contact portion between the flange 116 and the flange 158. Therefore, the friction torque generated in the latter is the shaft 16 that accompanies the rotation of the rotary drum 10.
While the friction torque generated in the former is large enough to prevent the rotation of the outer cylinder 148, the rotation torque of the outer cylinder 148 is easily allowed by the operator.

As described above, in the drum mount with brake of this embodiment, the outer cylinder 14 screwed to one end of the shaft 16 is used.
8 and the axial movement blocking member 154 attached to the other end, the gap between the frames 12 and 14 and the brake plate 34,
Both 36 and the pressing force of the rubber plates 76, 118 are adjusted. Therefore, it is not necessary to provide a dedicated braking force adjusting device, and the structure can be simplified. Further, the braking force can be easily adjusted by rotating the outer cylinder 148. As described above, the first brake plate in the claims is composed of the brake plates 34 and 36, the second brake plate is composed of the rubber plates 76 and 118, and the frame interval reduction device is the outer cylinder 148 and the screw thread. 14
It is composed of 0 and.

The operation of mounting the rotary drum 10 on the drum mount with brake constructed as described above will be described. First, two rubber plates 76 and 118 are fixed to the flanges 72 and 114 of the frames 12 and 14 by countersunk bolts, and the frames 12 and 14 are arranged on both sides of the rotary drum 10.
The connection pipes 18 are inserted into the pipe support cylinders 88 and 128 of the frames 12 and 14, respectively. However, the nut 9
Do not tighten bolts to 0 and 130,
Keep 2 and 14 accessible. Next, the shaft 16 is passed. The outer cylinder 148 is moved in advance to the side closest to the flange 142. The shaft 16 is attached to the shaft support cylinder 7 from the outside of the frame 12.
0, rubber plate 76, brake plate 34, rotary drum 10, brake plate 36, rubber plate 118, and shaft support cylinder 100.
The axial movement blocking member 154 is fitted to the other end 144 protruding to the outside of the frame 14, and the pin 168 is inserted at a position where the pin hole 146 of the shaft 16 and the pin hole 166 of the axial movement blocking member 154 match. To do.

The outer cylinder 148 is screwed to the right in FIG. 2 to narrow the gap between the frames 12 and 14, and the rubber plate 76 and the brake plate 34, and the rubber plate 118 and the brake plate 36 are pressed by an appropriate pressing force. To adjust. Since the rubber plates 76 and 118 have an appropriate elastic deformation ability, the pressing force can be adjusted well. When the outer cylinder 148 is screwed, the operator may press the handle 152 with one hand and rotate the handle 150 of the outer cylinder 148 with the other hand.

Next, the rotary drum 10 is lifted by the jacks 64 and 110, the pin hole 56 of the frame 12 and the pin hole 63 of the slide 54 are aligned, and the pin hole 102 of the frame 14 and the pin hole 106 of the slide 98 are aligned. Insert a pin (not shown) at the matching position to slide the slide 54,
98 are fixed to the frames 12 and 14, respectively, and the height of the rotary drum 10 is determined. The bolts are tightened to the nuts 90 and 130 so that the frames 12 and 14 are connected. Further, oil leakage can be reduced by releasing the hydraulic pressure in the jacks 64 and 110 during the work.

When the rotary drum 10 is removed from the frames 12 and 14, the slides 5 are moved by jacks 64 and 110.
Push up 4,98 and slide 54,98 to frame 1
Remove the pins fixing to 2 and 14 and lower the rotating drum 10 until it touches the ground. The outer cylinder 148 is screwed back to release the pressing force between the brake plates 34, 36 and the rubber plates 76, 118, the pin 168 is removed, and the shaft 16 is pulled out. When performing the next work, a new rotary drum is attached in the same manner as described above, but if the rubber plates 76 and 118 are worn, they are replaced with new ones.

As described above, when the drum is attached to the drum mount with the brake of this embodiment, the shaft 16 is inserted,
The axial movement blocking member 154 is attached to the projecting end, and the outer cylinder 14
By rotating 8 the distance between the frames 12 and 14 and the braking force can be adjusted all at once, so that the mounting work can be carried out easily and quickly. This work can be done by two workers in about 10 minutes.

Next, the cable drawing work using the drum mount with brake of this embodiment will be described with reference to FIG. Install a drum stand with a brake on the feeding side. The drum mount with a brake supports the rotary drum 10 around which the cable suspension wire 210 is wound. Winding device 2 on the winding side
Install 12. The winding device 212 includes a winch (not shown), a tension meter 214, guide rollers 216, 2
It has 17 etc. Winches are designed to operate using the driving force of the car engine, and in general,
Put the gear in low and rotate at a nearly constant speed.
In addition, the tension meter 214 detects the tension applied to the cable suspension wire 210, and the guide roller 21
Reference numerals 6 and 217 serve as guides for a nylon wire rope 218 wound by a winch.

220, 222, 224 are utility poles on the way of the extended route, and No. 2 gold wheel 226, No. 4 gold wheel 228, 230 are attached to each electric pole, respectively. The No. 2 gold car is installed when there is no risk of damage to the stretched cable because the cable support height of the adjacent utility poles is almost the same and the cable extends almost linearly. It is attached when the stretched cable may be bent and damaged.

The cylindrical portion 24 of the rotary drum 10 has a length of 1000 m.
The cable suspension wire (messenger wire) 210 of is wound. The cable suspension line 210 used for the experiment is 3.2 mm.
It is a 7 × steel twisted wire, and the safety load was set to 300 kg. This value is for these cable suspension lines 210 and ropes 2.
It was determined based on the breaking load of 18 and the safety factor (for example, 6).

First, the rope 2 for wire extension along the wire extension route
18 is stretched. Next, one end of the wire-drawing rope 218 is connected to the cable suspension wire 210 via a twisted metal piece 232, and the other end is wound around a winch via guide rollers 216 and 217. The twisted metal piece 232 prevents the twist of the wire rope from being transmitted to the cable suspension wire 210. When the engine is driven and the wire-drawing rope 218 is wound into a winch, the cable suspension wire 210 is stretched in place of the wire-drawing rope 218. When winding the wire rope 218, the wire rope 218 and the cable suspension wire 2
So that the tension applied to 10 does not exceed 300 kg,
The tension meter 216 is constantly monitored, and when the tension is large, the outer cylinder 148 is screwed back to reduce the braking force, and when the tension is small, the outer cylinder 148 is screwed to increase the braking force.

[0039]

[Table 1]

Table 1 shows a wire drawing work performed using a conventional drum mount with a brake (hereinafter, abbreviated as conventional work).
The following shows the results of comparison between the wire drawing work (hereinafter, abbreviated as the work of the present invention) performed using the brake-equipped drum mount of the present embodiment. As is apparent from Table 1, in the work of the present invention, the cable suspension wire 210 is loosened during the work,
There was almost no jumping up. Therefore, when working in urban areas (on roads, etc.) or in long-spanning points, in the conventional work, the hanging wire method is used, and a lot of slack monitoring workers are placed. However, this is not necessary in the work of the present invention. Therefore, since the work is simplified, the work time can be shortened, and the slack monitoring workers can be reduced, so that the personnel can be reduced. Further, in the conventional work, the braking force had to be adjusted frequently, but in the work of the present invention, there was almost no need to adjust the braking force.

Originally, the tension F applied to the cable suspension wire 210 should increase as the winding diameter r decreases, if the braking force applied to the rotary drum 10 is constant. This is because the rotational torque T of the rotary drum 10 based on the tension F can be expressed as T = F · r. Therefore, in order to keep the tension F constant, the braking force should be reduced as the winding diameter r decreases. However, in the drum mount with brake of the present embodiment, the rubber plates 76 and 118 are worn as the rotary drum 10 rotates, and the braking force applied to the rotary drum 10 becomes smaller, so it is presumed that the increase in the tension F is suppressed. It Therefore, the tension can be kept constant even if the braking force is hardly adjusted during the wire drawing work. The replacement of the rubber plates 76 and 118 was performed after completing the work of extending the cable suspension wire 210 having a total length of 20 km.

As described above, in the work of the present invention, the tension of the cable suspension wire 210 and the wire-drawing rope 218 could be kept substantially constant.
There was almost no need to adjust the braking force while watching 4. However, if the tension detected by the tension meter 214 becomes abnormally large, it can be seen that there is an obstacle or the like in the middle of the wire extension route and excessive tension is applied to the cable suspension line 210 or the rope 218. Therefore, the tension meter 214 is also monitored in the work of the present invention.

In the above embodiment, the brake plates 34, 36 were attached to both axial ends of the drum 10, but either one may be attached, and the disc portions 20, 22 of the drum 10 may be further provided. A part of the brake plate may be used.

In the wire drawing work of the above experiment, a communication cable (3,2 mm × 7 steel twisted wire) was stretched.
S cable, cable with wrapping type suspension wire (for example,
0.9mm × 20PSSS), suspension line (for example, 3.2m)
The drum mount with brake of the present embodiment can be used for the wire drawing work when the m / 7 steel stranded wire, 55 mm ² ), the optical communication cable (for example, 70 mm ² OPGW), etc. are stretched. In that case, the safety load may be obtained from the breaking load, safety factor, etc. of each cable, and the braking force may be adjusted so that the tension above the safety load is not applied.

Further, another embodiment of the drum mount with brake according to the present invention will be described with reference to FIG. In the above embodiment, the rubber plates 76 and 118 were used as the second brake plates, but in this embodiment, the friction material 250 (only one is shown in the figure) formed by mixing the organic material with the inorganic material. ) Is used, and a disc spring 252 is used to supplement the elastic force.
Is provided.

Shaft support tube 256 welded to slide 54
Is equipped with a flange 258 at one end thereof.
The friction material 250 is fixed to the 58. Shaft support cylinder 256
A moving member 262 is fitted to the outer end of the frame 12. The moving member 262 has a bottomed cylindrical shape, and an elongated hole 264 that extends in the axial direction is formed in the cylindrical portion of the movable member 262. A bolt 266 passes through the elongated hole 264 and the shaft supporting cylinder 25.
6 is screwed together. In addition, the bottom portion 26 of the moving member 262
A hole for penetrating the shaft is formed at the center of 8. And
A disc spring 252 is arranged between the end surface 270 of the cylindrical portion and the side surface 58 of the slide 54 with a constant preload. When the outer cylinder 148 is screwed to the right while the shaft 16 is supported by the frames 12 and 14, the outer cylinder 14 is rotated.
The end face of 8 pushes the bottom portion 268, and the moving member 262 makes the long hole 2
64 to the right and the end face 270 is moved to the disc spring 2
The frame 12 is pressed via 52. Disc spring 252
Is compressed, and its elastic force acts so as to reduce the distance between the frames 12 and 14.

When the cable extension work is performed using the drum mount with brake of the present embodiment, the friction material 250 is less likely to be worn than the rubber plates 76 and 118. Can be reduced.

FIG. 6 shows a drum mount with a brake according to still another embodiment of the present invention. The drum mount of this embodiment is different from the drum mount of the above embodiment in the shape of the second brake plate and the structure of the frame interval reduction device.

Shaft support tube 350 welded to slide 54
Has a flange 352 at one end thereof, and the flange 3
A rubber plate 354 is fixed to 52. The rubber plate 354 is obtained by cutting a rubber crawler belt used in an agricultural vehicle or the like into an appropriate size. That is, the rubber crawler belt has one surface that is flat, but the other surface is provided with projections that are substantially parallel to each other with an appropriate interval, and the surface 358 where the projections 356 are provided is the rotary drum. It is a friction surface that comes into contact with a disc 38 serving as a first brake plate fixed to the.
The rubber plate 354 has a quadrangular shape in a plan view. The shape and size of the rubber plate 354 are not particularly limited as long as an appropriate frictional force can be obtained between the rubber plate 354 and the disc 38, and therefore need not be the same as that of the disc 38. Since it does not matter if it has a quadrangular shape, the cutting work becomes easy.

A sleeve 362 is fitted inside the shaft 360, and a shaft 364 is inserted inside the sleeve 362. A stepped flange 366 is fixed to an intermediate portion of the sleeve 362, and an annular ring 368 is fixed to the slide 54 corresponding thereto. Flange 366 and slide 5
4, a spring 370 is positioned and disposed by the step portion of the flange 366 and the ring 368.
An elongated hole 372 extending in the axial direction is formed in the middle portion of the sleeve 362, and a bolt 374 fixed to the shaft 360 is fitted into the elongated hole 372 to prevent rotation of the sleeve 362. The axial movement range of the sleeve 362 is restricted. The handle 376 is fixed to one end of the shaft 364, and the male screw part 37 is attached to the other end.
8 is formed. On the other hand, a nut 380 is fixed to the inner peripheral surface of the shaft 360, and a female screw portion 378 is screwed into the nut 380.

The operation of mounting the rotary drum 10 on the drum mount with brake constructed as described above will be described. However, since most of the work is the same as that of the above-described embodiment, the description of that part is omitted. The sleeve 362 and the shaft 364 with the handle 376 are attached to the shaft 360. At that time, the handle 3 is adjusted so that the amount of protrusion of the sleeve 362 from the shaft 360 is maximized.
Rotate 76. The shaft 360 is attached from the outside of the frame 12 to the spring 370 and the rotating drum 10 (not shown).
Through to the outside of the frame 14,
To prevent axial movement outside the.

Next, the handle 376 is rotated to reduce the distance between the frames 12 and 14. As the shaft 364 rotates, the sleeve 362 moves in the axial direction, that is, the direction approaching the frame 12, while being guided by the bolt 374. As a result, the distance between the frames 12 and 14 is reduced, and the rubber plate 354 and the disc 38 contact each other. Thereafter, when the handle is further rotated, the spring 370 is compressed and the pressing force between the rubber plate 354 and the disc 38 increases.

In this embodiment, since the plurality of protrusions 356 are provided on the friction surface 358 of the rubber plate 354 as the second brake plate, an appropriate amount of frictional force is obtained and its size is increased. It is easy to keep constant.

When the cable installation work is performed using the drum stand with the brake of this embodiment, an appropriate braking force is maintained for a long time, so that the interval between the frames 12 and 14 is hardly adjusted during the work. May be. In this embodiment, since the rubber crawler belt for the agricultural vehicle is used for the rubber plate 354, the friction surface 358 is provided with a plurality of protrusions 356 in parallel, but the protrusions are radial or concentric. A formed rubber plate may be used.

Further, in each of the above-mentioned embodiments, the frame interval reducing device uses the screw mechanism, but it may be equipped with a hydraulic cylinder. In this case, it is also possible to automatically adjust the braking force by automatically controlling the hydraulic pressure.

Although not specifically exemplified, the present invention can be carried out in various modified and improved modes without departing from the scope of the claims based on the knowledge of those skilled in the art.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a drum mount with a brake according to an embodiment of the present invention.

FIG. 2 is a front view (partially sectional view) of the above embodiment.

FIG. 3 is a schematic view of a case where a communication cable drawing work is performed by using the drum mount with brake of the above embodiment.

FIG. 4 is a cross-sectional view showing a main part of a drum mount with a brake which is another embodiment of the present invention.

FIG. 5 is a schematic diagram of a case where a communication cable drawing work is performed using a conventional drum mount with a brake.

FIG. 6 is a cross-sectional view showing a main part of a drum mount with a brake which is another embodiment of the present invention.

[Explanation of symbols]

 12, 14 Frame 16 Shaft 34, 36 Brake plate 72, 74, 114, 116 Flange 76, 118 Rubber plate 140 Screw thread 148 Outer cylinder part 154 Axial movement blocking member 150, 152 Handle 250 Friction material 252 Disc spring 354 Rubber plate 360 Axis 370 Spring 376 Handle 378 Male thread 380 Nut

Claims (1)

[Claims] 1. A pair of frames arranged on both sides in the axial direction of a rotary drum around which a cable is wound, and a friction surface which is provided on at least one of both ends of the rotary drum in the axial direction and is perpendicular to the axial direction. A first brake plate that rotates integrally with the rotary drum; and a second brake plate fixed to the one of the pair of frames facing the first brake plate in a state of facing the first brake plate. , The rotary drum, the first brake plate and the second brake plate are penetrated, both ends are supported by the pair of frames to rotatably support the rotary drum and the first brake plate, and one end is A shaft that axially immovably engages with one of the pair of frames, and is provided at the other end of the shaft and acts on the other of the pair of frames so that the space between the pair of frames is increased. The by reduction, the pressing of the first brake plate to the second brake plate, a drum frame with brake which comprises a said frame interval to generate a suppressing braking force rotation of the rotary drum reduction device.