JPH09140018A - Drawing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To draw a cable, etc., efficiently in a narrow place such as a handhole, etc. SOLUTION: When an operating lever 36 is rotated, a swing lever 32 rotates on a block 34 and along with it a main lever 30 rotates making the upper end part a rotation fulcrum, and the tip of a crank lever 28 rotates. By the rotation of the crank fever 28, the main lever 30 and the swing lever 32 are pulled upwards, and the swing lever 32 moves upwards sliding with the block 34. Besides, the fitted axis-point of the lower end of the main lever 30 to which a grasping mechanism 40 is axis-fitted moves horizontally along a straight line 44 shown by a two-dot line, and a cable 46 is drawn linearly in the horizontal direction. At this time, the rod of one of ballance cylinders 54, 56 extends, and the other shrinks to keep a grasping mechanism 50 horizontal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for pulling a cable or a wire, and more particularly to a device suitable for pulling a cable or the like in a narrow space such as a handhole.

[0002]

2. Description of the Related Art When laying a cable in an underground pipe or removing a cable laid in an underground pipe,
Cable tractor is used. The cable traction machine includes a hydraulic type using a hydraulic cylinder and an electric type using an electric motor. A hydraulic cable traction machine has a traction machine that has a gripping member that grips the cable and a cylinder that pulls the gripping member in the axial direction of the cable installed in a cradle in a manhole, and operates from a hydraulic unit installed on the ground. Oil is supplied to the towing machine to pull the cable. In addition, an electric cable traction machine is a control unit that includes a power supply installed on the ground by installing a traction machine in which a traction machine body that holds a cable and a motor that drives the traction machine body are installed in a cradle in a manhole. The power is supplied to the motor from and the cable is pulled.

[0003]

However, although each of the above-described cable towing machines is large and can be installed in a manhole which can secure a relatively large work space, it is installed in a narrow handhole. It is difficult. Therefore,
When laying and removing cables in a narrow handhole, the worker enters the handhole and pulls it by hand, or the operator pulls the hand into the handhole from the ground and pulls it, so work safety is not sufficient. Not only that, it took a lot of time to work. Therefore, it has been desired to develop a device capable of efficiently pulling a cable in a narrow handhole.

The present invention has been made in view of the above demands, and provides a towing device capable of efficiently towing a cable or the like in a narrow place such as a handhole and without damaging the cable or the like. The purpose is to do.

[0005]

In order to achieve the above-mentioned object, a traction device according to the present invention is provided with a frame passed over an opening of a hole and attached to the frame, and a lower end portion of which is linearly moved in a horizontal direction. A link mechanism that is capable of swinging, an operating lever that projects above the frame and is swingable, and that operates the link mechanism; and a gripping mechanism that is attached to the lower end of the link mechanism and that grips a towed object. , And a balance mechanism that connects the gripping mechanism and the link mechanism and prevents the gripping mechanism from tilting.

As a link mechanism for linearly moving the lower end portion in the horizontal direction, a Posrier mechanism or a Scott Russell mechanism may be used. The balance mechanism is to prevent the towed object from being damaged by a bending force, and is composed of a pair of cylinders that interlock so that when one rod extends, the other rod contracts. be able to.

The gripping mechanism can be configured to have a gripping member for gripping the towed object and a gripping cylinder for opening and closing the gripping member. Then, the gripping cylinder may be provided with a return spring that moves the piston in a direction in which the gripping member releases the gripping of the towed object when the pressure of the working fluid ceases to act. On the other hand, the operation lever may be provided with a manual drive unit that supplies a working fluid to the gripping cylinder to operate the gripping cylinder.

The drive unit supplies the working fluid to the gripping cylinder via the pilot type check valve to operate the gripping member, and temporarily holds the towed object so that the gripping member and the towed object can move relatively. A pump cylinder, a main pump cylinder that supplies a working fluid to the gripping cylinder to operate the gripping member, and causes the gripping member to grip the temporarily held towed object, and a gripping lever that drives the main pump cylinder. , The pilot type check valve is applied with pilot pressure to open the check valve, and the main pump cylinder and the sub pump cylinder are communicated with each other to release the grip of the towed object by the gripping member A release lever that drives the sub pump cylinder when moved, and drives the pilot pump cylinder when rotated to the other side. It can be formed. The drive unit is provided between the main pump cylinder and the sub pump cylinder, and operates when the pressure of the working fluid supplied to the gripping cylinder by the main pump cylinder becomes equal to or higher than a set pressure. It is preferable to provide a relief valve that communicates with the sub-pump cylinder and that holds the cable gripping force of the gripping member at a constant level.

Further, the link mechanism has a crank lever having a base end pivotally attached to a frame, and a lever body having an upper end pivotally attached to a tip end of the crank lever and a gripping member pivotally attached to a lower end. And an arm portion orthogonal to the lever body, formed into a substantially T shape, and when the crank lever is tilted, the upper and lower ends of the lever body with respect to the base pivot point of the crank lever. The main levers, which are located on the opposite side in the left-right direction, and the lower end are pivotally attached below the arms of the lever body, and the middle part is vertically movable to the frame below the base pivotal attachment of the crank lever. The swing lever is pivotally attached, and the base end portion is pivotally attached to the frame on the side opposite to the arm portion side of the lever body, and the support lever is pivotally attached to the tip end portion of the arm portion. It is possible. Further, the frame is provided with a frame supporting portion that is vertically movable relative to the frame body and that engages with the opening of the hole to support the frame body. Further, the frame is formed to be expandable and contractible in the lateral direction.

[0010]

In the present invention constructed as described above, when the link mechanism is operated via the operation lever, the gripping mechanism attached to the lower end of the link mechanism moves horizontally, so that the gripping mechanism is not covered by cables or the like. By holding the towed object, the towed object can be towed straight in the horizontal direction. Moreover, since the horizontal balance mechanism is arranged between the link mechanism and the gripping mechanism to prevent the gripping mechanism from tilting, when the gripping mechanism moves, the gripping mechanism tilts to impart a bending force to the towed object, thereby towing It will not damage things.

Further, if the operating lever is provided with a manual drive unit and the holding cylinder of the holding mechanism for holding the towed object can be operated via this drive unit, the towed object can be held and released by a handhole. It can be easily performed outside the hole such as. And in the gripping cylinder,
A return spring is provided to move the piston in the direction to release the grip of the hauling object by the grip member when the pressure of the working fluid ceases to operate, and the drive unit is connected to the grip cylinder via the pilot check valve. A working fluid is supplied to actuate the gripping member to temporarily hold the towed object so that the gripping member and the towed object can move relative to each other, and a working fluid is supplied to the gripping cylinder to actuate the gripping member. Then, the main pump cylinder that causes the gripping member to grip the temporarily held towed object in a fixed manner, the grip lever that drives this main pump cylinder, and the pilot check valve to apply pilot pressure to open the check valve. , A pilot pump cylinder that connects the main pump cylinder and the sub pump cylinder to each other to release the grip of the attracted object by the grip member, and to the pressurizing side When configured to have a release lever that drives the sub pump cylinder when it is moved and drives the pilot pump cylinder when it is rotated to the other side, the grip lever is operated when the towed object is towed. When the towed object is fixedly gripped by the gripping member and the gripping mechanism is returned to the towing start position, the towed object is released by returning the gripping lever to the temporary gripping state. Without this, the gripping mechanism can be moved relative to the towed object, continuous pulling can be performed without re-gripping, and the pulling efficiency can be improved. Further, the drive unit is provided between the main pump cylinder and the sub pump cylinder, and operates when the pressure of the working fluid supplied to the gripping cylinder of the main pump cylinder becomes equal to or higher than a set pressure. If a relief valve that holds the gripping force of the gripping member in constant communication with the cylinder is provided, for example, when the towed object is a cable, an excessive gripping force acts on the cable to crush the cable, It can be prevented from being damaged.

Further, by providing a frame support portion which can move relative to the frame main body in the vertical direction, the vertical position of the frame main body can be adjusted, and the vertical position of the lower end of the link mechanism is grasped and pulled by a cable or the like. It can be in a position suitable for operation. Furthermore, by making the frame expandable and contractible in the lateral direction, it is possible to accommodate various sizes of holes.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of a traction device according to the present invention will be described in detail with reference to the accompanying drawings. FIG.
[Fig. 3] is a front view showing a main part of the traction device according to the embodiment of the present invention.

In FIG. 1, the traction device 10 has a rectangular frame body 12. This frame body 12
The upper and lower lateral members 14, 16 are formed by square pipes as shown in FIG. And the lateral members 14, 16
Has both ends fixed to the upper and lower gasps of the connecting pipe 18.
Further, at both ends of the lateral members 14, 16, each lateral member 14,
The plate-shaped vertical members 20 and 22 passed between 16 are fixed. Furthermore, in the longitudinal central portions of the lateral members 14 and 16,
A support member 24 is attached by connecting the upper and lower lateral members 14 and 16. The support member 24 supports the link mechanism 26 and also serves as a fixed link of the link mechanism 26.

The link mechanism 26 has a crank lever 28 whose base end is pivotally attached to the upper end of the support member 24 via a pin A.
A main lever 30 whose upper end is pivotally attached to the tip of the crank lever 28 by a pin B and extends below the frame body 12, and a swing lever 32 whose lower end is pivotally attached to the main lever 30. doing. The main lever 30 is arranged so as to intersect with the support member 24 when the crank lever 28 is inclined with respect to the support member 24, and the upper end and the lower end thereof are located at the base end pivotal attachment portion A of the crank lever 28. In contrast, they are located on opposite sides of each other in the left-right direction. The lower end of the swing lever 32 is located at the pin C at a position slightly lower than the center of the main lever 30 in the vertical direction.
It is pivoted through. The swing lever 32 penetrates a block 34 attached to the support member 24 via a pin D and is movable in the vertical direction. Then, an operation lever 36 for operating the link mechanism 26 by swinging the swing lever 32 according to the principle of locking is fixed to the upper end portion of the swing lever 32.

The block 34 serves as a swing center of the swing lever 32, and when the swing lever 32 swings, the swing lever 32 slides on the block 34 and moves in the vertical direction. The swing center (pivotally attached portion) D of the swing lever 32 is positioned vertically below the base end pivotally attached portion A of the crank lever 28. Then, the block 34 uses the operation lever 36 to move the swing lever 3
When 2 is swung as indicated by arrow 38, the reaction force accompanying the swing of the main lever 30 is received, and the reaction force is transmitted to the support member 24. That is, when the swing lever 32 is swung as shown by the arrow 38, the tip pivot portion B of the crank lever 28 swings along the locus 40 indicated by a chain double-dashed line via the main lever 30.
The lower end pivot point C of 2 moves like a locus 42 indicated by a chain double-dashed line, and the support member 24 moves up and down while slidingly contacting the block 34.

As shown in FIG. 3, the main lever 30 has a lever body 43 whose upper end is pivotally attached to the tip of the crank lever 28, and an arm portion 47 which is provided orthogonal to one side of the lever body 43. It has a T-shape. A base end portion of a support lever 45 is pivotally attached via a pin E to the vertical member 22 located on the side of the lever body 43 opposite to the side where the arm portion 47 is provided. The tip end of the arm 47 of the main lever 30 is pivotally attached to the tip pivot part G of the support lever 45. Then, the link mechanism 26
When the swing lever 32 is swung, each lever is moved so that the lower end pivot portion F of the main lever 30 pivotally attaching the gripping member 50 moves on a straight line 44 parallel to the lateral member 16 of the frame body 12. The dimensions of are set.

On the lower end pivot portion F of the main lever 30, there is pivotally attached a gripping structure 50 for gripping the cable 46, which will be described in detail later. Further, brackets 52 are fixed to both sides in the width direction of the lower end of the main lever 30, and balance cylinders 54 and 56, which constitute a horizontal balance mechanism, are mounted between the bracket 52 and the gripping mechanism 50. Yes (see FIG. 4). These balance cylinders 5
As shown in FIG. 4, when the main lever 30 is vertical, the rods 4 and 56 are adjusted so that the extension amounts of the rods are the same, and one of them is connected to one of the two via a conduit (not shown). The door side chamber communicates with the other mouth side chamber, so that when one rod extends, the other rod contracts, preventing the gripping mechanism 50 from tilting. .

The lateral member 1 constituting the frame body 12
As shown in FIG. 3, stoppers 58 and 60 for restricting the swing amount of the crank lever 28 are provided on the upper surfaces of both ends of the crankshaft 4. Further, on both sides of the lateral members 14, 16, a telescopic support unit 62, 64 is detachably mounted, which constitutes a frame together with the frame main body 12 and is used to install the traction device 10 at an upper opening of a hole such as a handhole. It is supposed to be done. These telescopic support units 62 and 64 have the same structure and have upper and lower telescopic rods 66 and 68 inserted into the respective lateral members 14 and 16, and these upper and lower telescopic rods 66 and 68 are They are connected by a connecting plate 70. Each of the expandable rods 66, 68 has a prismatic shape, and a plurality of screw holes 72 are formed in the longitudinal direction of one side surface at appropriate intervals, and the vertical members 20, 22 are inserted through the screw holes 72. A bolt 74 screwed with a nut (not shown) fixed to the horizontal member is screwed to the lateral members 14 and 16, and the expansion / contraction amount is adjusted according to the size of the hand hole (hole) 94 in which the traction device 10 is installed. You can do it.

Sprockets 78, 80 are rotatably provided at the upper and lower ends of each connecting plate 70 via mounting brackets 76, 77. These sprockets 78, 8 are rotatable.
A chain 82 is wound around 0. A bracket 84 is provided near the upper mounting bracket 76 on the side of the connecting plate 70 of the telescopic support units 62, 64 facing the chain 82, and between the bracket 84 and the lower mounting bracket 77. A pair of guide rods 88 penetrating the moving block 86 are provided in pairs. The moving block 86 can be screwed to the guide rod 88, and a sprocket 90 meshing with the chain 82 is rotatably attached to the tip side of the moving block 86. Further, the sprocket 90 is screwed into a screw shaft screwed into the moving block 86 and is rotated by the chain 82, whereby the screw shaft moving block 8 is rotated.
The amount of protrusion (expansion and contraction) from 6 can be changed, and the upper reaction force receiver 9 attached to the tip of the screw shaft 9
Change the horizontal position of 2.

The upper reaction force receiver 92 is formed in an inverted L shape, and its horizontal portion is a frame supporting portion which is hung on the upper opening portion 96 of the handhole 94 to support the traction device 10. The vertical portion comes into contact with the wall surface of the handhole 94. A support rod 98 is inserted into the moving block 86 in a direction orthogonal to the paper surface of FIG. The lower end of the support rod 98 is located at the same position as the lower surface of the horizontal portion of the upper reaction force receiver 92, and the support rod 98 is passed over the upper portion of the hand hole 94 to support the traction device 10. That is, the upper reaction force receiver 92 and the support rod 98 are engaged with the upper reaction force receiver 92 at the upper opening 96 of the handhole 94, and when the support rod 98 is passed over the upper portion of the handhole 94, the guide rod 88 is provided. The load of the traction device 10 acting via the moving block 86 and the moving block 86 is supported.

The sprocket 80 rotatably mounted on the lower mounting bracket 77 is
It is screwed into the screw shaft that is screwed into. In addition, this screw shaft is provided with a lower reaction force receiver 10 that contacts the side surface of the hand hole 94.
0 is attached to the tip, and the amount of protrusion (expansion and contraction) from the mounting bracket 77 due to the rotation of the sprocket 80
Changes and changes the horizontal position of the lower reaction force receiver 100. Then, the handle 101 can be attached to and detached from the upper sprocket 78 as shown by the broken line. By rotating the handle 101, the sprocket 90 and the sprocket 80 are simultaneously rotated,
The screw shafts screwed into these sprockets 90 and 80 are expanded and contracted to receive reaction force 92 and 10 above and below the frame.
It is possible to move 0 back and forth in synchronization.

The lower end portion of the main lever 30 is shown in FIG.
As shown in (1), the mounting hole 102 is formed, and the bush 104 penetrates the mounting hole 102. A support bracket 108 having a U-shaped cross section is swingably attached to the main lever 30 via a pin 106 penetrating the bush 104. The support bracket 108 supports the gripping cylinder 110 that constitutes the gripping mechanism 50 at the lower end, and
A rectangular grip case 116 accommodating the upper and lower grip members 112 and 114 is attached. These gripping members 11
2, 114 are made of hard rubber, so-called iron rubber, so as not to damage the grasped cable 46.

The lower holding member 114 is the holding case 11
It is fixed to the bottom of 6 and its upper surface is an arcuate surface 118 for disposing the cable 46. On the other hand, the upper gripping member 112 has an arcuate portion 120 for receiving the cable 46 formed on the lower surface facing the lower gripping member 114.
The upper gripping member 112 is attached to the gripping cylinder 110 and moves up and down by the gripping cylinder 110 to cooperate with the lower gripping member 114 to connect the cable 4 to the cable 4.
6 is grasped and released. In the grip cylinder 110, the upper part of the cylinder body 122 is inserted into the support bracket 108, and the tip opening at the lower end is located in the grip case 116.

The piston member 124 that slides in the cylinder body 122 is formed in a cylindrical shape, and a flange that abuts the tip end opening of the cylinder body 122 is provided at the lower end opening in the figure, and a partition wall. The inside is partitioned by 126 into a head side chamber 128 and a tip side chamber 130.
A female screw portion is formed on the inner peripheral surface of the tip side chamber 130, and the plug body 132 is screwed into the female screw portion to seal the tip side chamber 130. Furthermore, the plug 13
A fixing plate 1 having an upper grip member 112 fixed to the lower end of the fixing plate 1.
34 is screwed on. In addition, on the upper part of the fixed plate 134,
The lower end of a stud bolt 210 for pulling up the upper grip member 112 is screwed (see FIG. 4).

The stud bolt 210 is used for the cylinder body 1.
22 are arranged on both sides of the grip 22, and the upper end is the grip case 11.
6 is located in the support bracket 108.
A pair of nuts 212 (so-called double nuts) are screwed onto the upper portion of the stud bolt 210, and a ring-shaped upper spring stopper 2 is provided below the nuts 212.
14 are arranged. Further, on the upper surface of the grip case 108, a lower spring stopper 2 having a stud bolt 210 penetrating therethrough is provided.
16 is arranged, and the return spring 218 is compression interposed between the lower spring stop 216 and the upper spring stop 214. The return spring 218 urges the upper gripping member 112 upward via the fixing plate 134, and when the gripping cylinder 110 is operated and the stud bolt 210 is lowered together with the piston member 124, the return spring 218 is compressed by the upper spring stopper 214. As described later, when the pressure does not act on the head side chamber 128, the piston member 124 is moved to the position shown in FIG.
The cable 46 is returned to the position (1) and the gripping of the cable 46 by the upper and lower gripping members 112 and 124 is released.
Then, as shown in FIG. 4, the side plate 1 for guiding the upper grip member 112 in the vertical direction is provided on the side of the grip case 116.
36 is provided.

As shown in FIG. 5 (2), when gripping the cable 137 having a small diameter, the upper gripping member 139 having a small arc portion 120 is used. The upper gripping member 139 is formed thicker in the vertical direction than the upper gripping member 122 that grips the large-diameter cable 46, and the stroke amount of the gripping cylinder 110 does not change depending on the thickness of the cable when gripping the cable. Is done.

As shown in FIG. 6, a gripping mechanism 50 is provided above the operation lever 36 for swinging the swing lever 32.
The drive unit 140 described later in detail for operating
Is fixed. A shaft hole 141 is formed in the operation lever 36 above the drive unit 140, and a rotary shaft 144 having a gripping lever 142 fixed thereto penetrates the shaft hole 141 rotatably. A spacer 146, through which the rotating shaft 144 penetrates, is arranged between the grip lever 142 and the operation lever 36, and an appropriate gap is formed between the grip lever 142 and the operation lever 36. is there.

The rotating shaft 144 has threaded portions formed at both ends, a grip lever 142 is fixed to one side of the operating lever 36, and a cam 148 is fixed to the other side. The grip lever 142 is fixed to the rotary shaft 144 by a key (not shown), a washer 150 and a nut 152 fitted on the rotary shaft 144, and is rotatable with respect to the operation lever 36. The grip lever 142 is gripped together with the operation lever 36, so that the grip mechanism 50 will be described later.
Is designed to grip the cable 46, and when the gripping mechanism 50 releases the cable 46, it is arranged with an appropriate opening angle with the operation lever 36.

Between the operating lever 36 and the cam 148,
The gripping main pump cylinder 151 (see FIG. 7) is provided with a spacer 150 arranged around the rotary shaft 144, and the position of the cam 148 constitutes the drive unit 140.
It corresponds to the position of the plunger 152.
The cam 148 is fixed to the rotary shaft 144 by a key 154 and a nut 156, and is rotated integrally with the rotary shaft 144. The cam 148 is in contact with the roller 158 provided on the plunger 152, holds the grip lever 142 together with the operation lever 36, and rotates the rotation shaft 144.
Is rotated, the plunger 14 is moved through the roller 158.
8 is pushed down to drive the main pump cylinder 151,
The upper gripping member 112 of the gripping mechanism 50 is lowered.

The drive unit 140 has a structure as shown in FIG. 7, and has a main body 160 for holding the cable 46 in a fixed manner so that the gripping mechanism 50 and the cable 46 cannot move relative to each other. A pump cylinder 151, a sub-pump cylinder 162 for temporarily holding the cable 46 so that the gripping of the cable 46 by the gripping mechanism 50 can be moved relative to each other, and a pilot pump cylinder 164 for releasing the gripping. It is integrally formed and incorporates a pilot check valve 182 and a relief valve 190, the operation of which will be described later.
The hydraulic circuit of the drive unit 140 is as shown in FIG. 8, and the drive unit 140 and the gripping mechanism 50 are connected by a hydraulic hose 196.

Flow path 18 on the main pump cylinder 151 side
4 and the flow path 186 on the sub pump cylinder 162 side are connected by bypass via a normally closed pilot check valve 182, and hydraulic oil flows from the main pump cylinder 151 side to the sub pump cylinder 162 side. Is being blocked. However, when the release lever 172 rotates counterclockwise in FIG. 7 to drive the sub-pump cylinder 162, the pilot type check valve 182 causes the passage 1 to flow.
The valve spring 192 is compressed and opened by the pressure generated in 86, and the working oil (working fluid) flows from the flow path 186 side to the flow path 184 side. Further, in the pilot type check valve 182, when the release lever 172 rotates clockwise in FIG. 7 to push down the rod 180 and pilot pressure is generated in the pilot pump cylinder 164, the spool 188 moves leftward in FIG. 7. It is opened by moving and compressing the valve spring 192 so that the flow passage 184 and the flow passage 186 are communicated with each other so that the hydraulic oil on the main pump cylinder 151 side flows to the sub pump cylinder 162 side.

The flow path 18 on the main pump cylinder 151 side
4 is connected to the head side chamber 128 of the gripping cylinder 110 via a port 198. The flow path 186 on the sub-pump cylinder 162 side is connected to the flow path 184 on the main pump cylinder 151 side via the relief valve 190, and the head side chamber 128 of the gripping cylinder 110 is connected via this flow path 184. Is in communication with. This relief valve 19
0 opens when the valve spring 194 is compressed by the pilot pressure generated in the flow path 184 on the main pump cylinder 151 side, and the hydraulic oil discharged from the main pump cylinder 151 flows into the sub pump cylinder 162. However, as described later, the gripping members 112, 114
The gripping force of the cable 46 due to is maintained at a constant value. The cable gripping force of the gripping members 112 and 114 can be adjusted by changing the insertion amount of the pressure adjusting pin 195 screwed to the main body 160 and changing the spring force of the valve spring 194. The port 200 of the flow path 186 on the sub pump cylinder 162 side is closed by a blind plug 199.

Plunger 1 of sub-bomb cylinder 162
A roller 168 is attached to the upper end of 66. The roller 168 is in contact with a cam portion 174 formed on a release lever 172 fixed to the rotating shaft 170, and is pushed down by the cam portion 174 when the release lever 172 is fully rotated counterclockwise in FIG. , The plunger 166 is pushed downward to increase the pressure in the flow path 186, and the pilot check valve 182 is opened. Also, the rotating shaft 1
The armature 70 is rotatably attached to the arm 201 provided on the operation lever 63, and the cam 176 is fixed as shown in FIG. 6B. The cam 176 is in contact with the upper end of the rod 180 provided on the plunger 178 of the pilot pump cylinder 164, and the release lever 1
When 72 is rotated clockwise in FIG.
Is pushed down to generate the pilot pressure of the normally closed pilot type check valve 182 to open the check valve 182.

The operation of the embodiment constructed as described above is as follows. First, at the work site, as shown in FIG. 3, the telescopic support units 6 are provided on both sides of the frame body 12.
Wear 2, 64. At this time, the insertion amount of the telescopic rods 66 and 68 inserted into the lateral members 14 and 16 of the frame body 12 is adjusted according to the size of the opening of the handhole 94.
Then, the moving block 86 is moved along the guide rod 88 according to the depth of the hand hole 94, that is, the position of the cable 46 to be pulled, and the moving block 86 is fixed to the guide rod 88. After that, the lower reaction force receiving 100 side is inserted into the handhole 94 through the moving block 86 through the supporting rod 98, and the traction device 10 is supported by the supporting rod 98. When the cable is pulled from the right side to the left side in FIG. 1, for example, when the main lever 30 is tilted to the limit as shown in FIG. 46
It is the depth corresponding to the opening of the pipe through which

Next, the handle 101 is attached to the upper sprocket 78, the sprocket 78 is rotated by the handle 101 to rotate the chain 82, and the sprockets 90 and 80 meshing with the chain 82 are rotated to be attached to the moving block 86. The screw shaft screwed into the bracket 77 is extended so that the reaction force receivers 92 and 100 engage with the handhole 94. Further, the operation lever 36 to which the drive unit 140 is attached is connected and fixed to the upper portion of the swing lever 32.

At the time of starting the drive unit 140, that is, before gripping the cable, the release lever 172 is inclined to the right in FIG. 7, the rod 180 is pushed down, and the pressure generated in the plunger chamber of the pilot pump cylinder 164 causes the release lever 172 to tilt. The spool 188 has moved to the left in FIG. 7 to release the pilot check valve 182. Then, the cable 46 is attached to the lower grip member 114 of the grip mechanism 50.
The release lever 1 of the drive unit 140 in this state.
72 is rotated counterclockwise in FIG. As a result, the cam portion 174 of the release lever 172 pushes down the plunger 166 via the roller 168, and the sub pump cylinder 16
2 is driven to increase the pressure in the flow path 186. Therefore, the spool 188 moves rightward and pushes up the plunger 178 of the pilot pump cylinder 164. Further, the hydraulic oil discharged from the sub pump cylinder 162 flows into the head side chamber 128 of the gripping cylinder 110 via the bypass provided with the check valve 182 and the flow path 184, and lowers the piston member 124. The sub pump cylinder 162 has a lock mechanism and is locked when the upper gripping member 112 contacts the lower gripping member 114,
The upper gripping member 112 and the lower gripping member 114 temporarily hold the cable 46, that is, with a force that allows the gripping members 112, 114 and the cable 46 to relatively move in the axial direction.

After that, the grip lever 142 and the operating lever 3
6 is gripped together, and the grip lever 142 is rotated clockwise in FIG. 7, that is, toward the operation lever 36 side. As the grip lever 142 rotates, the cam 148 moves the rotation shaft 14
4 and the plunger 1 via the roller 158.
52 is pushed down to drive the main pump cylinder 151. Therefore, the flow path 184 side becomes high pressure and the check valve 1
The valve spring 192 moves to the right in FIG. 7 to close the bypass, so that the hydraulic oil in the plunger chamber of the main pump cylinder 151 passes through the flow passage 184 and the grip cylinder 11 moves.
0 into the head side chamber 128, and the piston member 1
24 is lowered, the upper gripping member 112 and the lower gripping member 1
The cable 46 is fixedly held by 14 so as not to move relative to each other. Then, when the gripping lever 142 further rotates toward the manipulating lever 36 and the stroke of the gripping cylinder 110 reaches a predetermined value, the pressure in the flow path 184 further increases and becomes equal to or higher than the pressure set by the valve spring 194. , The relief valve 190 compresses the valve spring 194 and moves to the right in FIG. 7 to connect the flow path 184 and the flow path 186,
The hydraulic oil on the flow path 184 side is caused to flow into the flow path 186 side. As a result, the gripping force of the cable 46 by the upper and lower gripping members 112 and 114 is held at a constant value set by the valve spring 194, and it is possible to avoid the disadvantage that the cable 46 is dipped.

In the state where the cable 46 is fixed and gripped by the gripping mechanism 50, the swing lever 32 is
When the operation lever 36 fixed to the upper end of the is rotated clockwise in FIG. 1, the swing lever 32 rotates clockwise using the block 34 as a pivot (rotational fulcrum), and the main lever 30 moves the upper end. It rotates clockwise as a rotation fulcrum, and the tip of the crank lever 28 rotates clockwise. By the rotation of the crank lever 28, the main lever 30 and the swing lever 82 are pulled upward, the swing lever 32 moves upward while sliding with the block 34, and the lower end of the main lever 30 pivotally attached to the gripping mechanism 40. 1 along a straight line 44 whose pivot point is shown by a chain double-dashed line.
Horizontally from the right side to the left side, and pulls the cable 46 in a straight line in the horizontal direction. At this time, the rod of the balance cylinder 54, which constitutes the horizontal balance mechanism, extends as the main lever 30 rotates clockwise, and the rod of the balance cylinder 56 is pushed into the cylinder body, so that the cable 46 is removed. Cable 4 by towing
Holding the gripping mechanism 50 vertically against the reaction force from 6 and keeping the cable 46 horizontal as shown,
Prevents damage caused by bending force acting on.

When the main lever 30 is rotated to the position shown by the chain double-dashed line in FIG. 1, the grip lever 142 is returned to its original state. As a result, the pressure acting on the head side chamber 128 of the grip cylinder 110 is reduced, and the grip member 11
The gripping of the cable 46 by the wires 2 and 114 is in a temporary gripping state, and the gripping members 112 and 114 and the cable 46 are relatively movable. I'm sorry. Further, when the crusher rotates counterclockwise, the gripping mechanism 50 causes the cable 46 to move.
The main lever 30 can be returned to the pulling initial position shown in FIG. Then, if the operation lever 36 and the grip lever 142 are gripped together in the same manner as described above, the cable 4 is again gripped by the grip members 112 and 114.
6 can be held fixed, the cable 46 can be towed in the same manner as described above, and the cable 46 can be towed continuously without releasing.

When the pulling of the cable 46 is completed, the grip lever 142 is returned to the initial position and the release lever 172 is rotated clockwise in FIG. As a result, the rotating shaft 170 rotates clockwise, and the cam 176 moves to the rod 1.
The plunger 178 is pushed down via 80 to drive the pilot pump cylinder 164. Then, high pressure is generated in the plunger chamber of the pilot pump cylinder 164,
This high pressure moves the spool 188 to the left in FIG.
The pilot type check valve 182 is pushed to the left in FIG. 7 to release the bypass, and the flow passages 184 and 186 are connected to make the pressures of these flow passages the same. Therefore, the pressure of the head side chamber 128 of the gripping cylinder 110 is reduced, and the tension of the return spring 218 causes the piston member 12 to move.
4 rises, and the cable 4 by the gripping members 112 and 114
The grip of 6 is released. As a result, the cable 46 can be removed from the gripping mechanism 50.

As described above, in the embodiment, the cable 46 can be pulled by rotating the operation lever 36 located above the frame main body 12 installed in the handhole 94, and the operator can handle the narrow handhole 94. The cable 46 can be safely towed without having to go inside. The operation of the hydraulic gripping mechanism 50 for gripping and releasing the cable 46 can be performed by operating the lever of the drive unit 140 on the ground, which facilitates the gripping and releasing operation of the cable 46 and improves work efficiency. Can be greatly improved. Moreover, the gripping mechanism 50
Since it moves linearly in the horizontal direction, it is possible to prevent the towed cable 46 from being rubbed and damaged by hitting the outlet portion of the conduit. In addition, in the embodiment, the cable 46 is
Since the gripping mechanism 50 that grips the cable is prevented from inclining, the cable 46 is not bent and damaged when the cable 46 is pulled.

Further, since the cable 46 can be tentatively gripped so as to be movable relative to the gripping mechanism 50, it is not necessary to detach the cable 46 from the gripping mechanism 50 to return the main lever 30 to the pulling closing start position, and the cable 46 can be quickly moved. It is possible to perform towing. Then, when the force with which the gripping members 112 and 114 grip the cable 46 reaches a set value, the relief valve 194 provided in the drive unit 140 is opened to keep the gripping force constant. There is no danger of being crushed or damaged. Further, in the embodiment, the frame body 12 and the telescopic support units 62, 6 are provided.
4 can be easily assembled and disassembled, and the operation lever 36 to which the drive unit 140 for operating the gripping mechanism 50 is attached is detachable from the swing lever 32 attached to the frame body 12. By disassembling, the traction device 10 can be easily transported and stored.

Further, in the embodiment, the telescopic rod 6
The width of the frame can be changed by adjusting the amount of expansion and contraction of 6 and 68, and it is possible to easily cope with the large size of the handhole 94. Moreover, in the embodiment, the upper reaction force receiver 92 that is hooked on the opening 96 of the handhole 94 and the handhole 9 are provided.
By rotating the chain 82 with the lower reaction force receiver 100 that contacts the wall surface of 4, the horizontal position can be adjusted,
The traction device 10 can be easily installed in the handhole 94. Then, by moving the moving block 86 along the guide rod 88 and changing the insertion depth of the frame into the handhole 94, the gripping mechanism 50 can be easily arranged at a position suitable for pulling the cable 46. Further, the drive unit 140 can operate the gripping mechanism 50 without supplying hydraulic oil from the outside, does not need to carry a hydraulic pressure supply source such as a hydraulic pump, and can be easily installed at any work site. You can

Incidentally, FIG. 9 shows an example of the dimensional ratio of each lever of the link mechanism 26 according to the embodiment. The length of the crank lever 28 is 200 mm, the length of the main lever 30 is 1230 mm, and the length of the arm portion 47 of the main lever 30 is 1
50 mm, the length of the support lever 45 is 350 mm, and the vertical distance between the base end pivot point A of the crank lever 28 and the base end pivot point E of the support lever 45 is 250 m.
If the distance is m, the distance between the lower end pivot point C of the swing lever 32 and the pivot point D of the block 34 is equal to the swing lever 3
When 2 moves up and down, it changes within 510-420 mm.

In the above embodiments, the pulling of the cable has been described, but the present invention can be applied to pulling a rope, a wire or a pipe. Further, the case where the link mechanism 26 is composed of the crank lever 28, the main lever 30, the swing lever 32 and the like has been described. However, it is possible to use an accurate linear movement mechanism such as a Boslier mechanism or a Scott Russell mechanism, or a grasshopper mechanism. An approximate linear motion mechanism or the like may be used.

[0047]

As described above, according to the present invention, when the link mechanism is operated via the operating lever, the grip mechanism attached to the lower end of the link mechanism moves in the horizontal direction. By holding the towed object such as a cable in the horizontal direction, the towed object can be pulled straight in the horizontal direction. Moreover, since the horizontal balance mechanism is arranged between the link mechanism and the gripping mechanism to prevent the gripping mechanism from tilting, when the gripping mechanism moves, it tilts and the bending force acts on the towed object. It is possible to prevent inconvenience such as damage to the towed object.

Further, a manual drive unit is provided on the operation lever, and the holding cylinder of the holding mechanism for holding the towed object can be operated via the drive unit.
The towed object can be easily grasped and released outside a hole such as a handhole. Then, when the pressure of the working fluid stops acting on the gripping cylinder, a return spring that moves the piston in the direction to release the gripping of the towed object by the gripping member is provided, and the drive unit is
A sub-pump cylinder for temporarily holding the towed object so that the gripping member and the towed object can be relatively moved by supplying the working fluid to the gripping cylinder via the pilot check valve to operate the gripping member. To the gripping member to actuate the gripping member by supplying the working fluid to the gripping member, to grip the gripping member with the temporarily held object, a gripping lever that drives the main pump cylinder, and a pilot check valve. Pilot pressure is applied to open the check valve to connect the main pump cylinder and the sub pump cylinder to release the grip of the towed object by the grip member, and the sub pump when the pressurizing side is turned. By having a structure that has a release lever that drives the cylinder and drives the pilot pump cylinder when rotating to the other side, When pulling a pulling object, the gripping lever is operated to firmly grip the towed object by the gripping member.When returning the gripping mechanism to the towing start position, the gripping lever is returned to the temporary gripping state. By doing so, the gripping mechanism can be moved relative to the towed object without releasing the towed object, continuous towing is possible without re-gripping, and the tow efficiency is improved. You can Further, the drive unit is provided between the main pump cylinder and the sub pump cylinder, and operates when the pressure of the working fluid supplied from the main pump cylinder to the gripping cylinder is equal to or higher than a set pressure, and the main pump cylinder and the sub pump cylinder are operated. Since a relief valve that communicates with the pump cylinder and holds the gripping force of the gripping member constant is provided, when the towed object is a cable, for example, an excessive gripping force acts on the cable to dip the cable. It is possible to prevent it from being scratched or damaged.

Further, by providing a frame supporting portion which can move relative to the frame body in the vertical direction, the vertical position of the frame body can be adjusted, and the vertical position of the lower end portion of the link mechanism is grasped and pulled by a cable or the like. It can be in a position suitable for operation. Furthermore, by making the frame expandable and contractible in the lateral direction, it is possible to accommodate various hole sizes.

[Brief description of the drawings]

FIG. 1 is a front view of a main part of a traction device according to an embodiment of the present invention.

FIG. 2 is a side view of the link mechanism portion according to the embodiment.

FIG. 3 is a rear view showing a state in which the frame according to the exemplary embodiment is handed over to the handhole.

FIG. 4 is a front view showing details of the horizontal balance mechanism according to the embodiment.

FIG. 5 is a sectional view of the gripping mechanism according to the embodiment.

6A and 6B are a cross-sectional view and a side view showing an operation portion of a drive unit that operates the gripping mechanism according to the embodiment.

FIG. 7 is a sectional view of a drive unit according to the embodiment.

FIG. 8 is a diagram showing a hydraulic circuit of the drive unit according to the embodiment.

FIG. 9 is a diagram showing an example of lever dimensional ratios of the link mechanism according to the embodiment.

[Explanation of symbols]

10 traction device 12 frame body 24 support member 26 link mechanism 28 crank lever 30 main lever 32 swing lever 36 operation lever 43 lever body 46 cable 45 support lever 47 arm 50 gripping mechanism 54, 56 horizontal balance mechanism (balance cylinder) 62, 64 telescopic support mechanism 66, 68 telescopic rod 82 chain 92 frame support (upper reaction force receiver) 100 lower reaction force receiver 110 gripping cylinder 140 drive unit 142 gripping lever 148, 176 cam 151 main pump cylinder 162 sub-pump cylinder 164 pilot pop Cylinder 172 Release lever 174 Cam part 182 Pilot type check valve 190 Relief valve

Claims (7)

[Claims] 1. A frame which is passed to an opening of a hole, a link mechanism which is attached to the frame and has a lower end portion which is linearly movable in a horizontal direction, and which is provided so as to project above the frame and be swingable. An operating lever that operates the link mechanism, a gripping mechanism that is attached to a lower end portion of the link mechanism and grips a towed object, and a balance that connects the gripping mechanism and the link mechanism and prevents the gripping mechanism from tilting. A traction device having a mechanism. 2. The gripping mechanism includes a gripping member that grips the towed object, and a gripping cylinder that opens and closes the gripping member, and the operating lever manually operates to supply the working fluid to the gripping cylinder. The traction device according to claim 1, further comprising a drive unit. 3. The gripping cylinder includes a return spring that moves a piston in a direction to release gripping of the towed object by the gripping member when the pressure of the working fluid stops acting. The drive unit supplies a working fluid to the gripping cylinder via a pilot type check valve to operate the gripping member, and temporarily grips the towed object so that the gripping member and the towed object can move relative to each other. A pump cylinder, a main pump cylinder that supplies a working fluid to the gripping cylinder to operate the gripping member, and fixedly grips the temporarily held towed object by the gripping member, and drives the main pump cylinder. Pilot pressure is applied to the gripping lever and the pilot check valve to open the check valve to connect the main pump cylinder and the sub pump cylinder. A pilot pump cylinder for releasing the holding of the towed object by the holding member, and a release for driving the sub pump cylinder when turning to the pressurizing side and driving the pilot pump cylinder when turning to the other side. The traction device according to claim 2, further comprising: a lever. 4. The drive unit is provided between the main pump cylinder and the sub pump cylinder,
It operates when the pressure of the working fluid supplied to the gripping cylinder by the main pump cylinder becomes equal to or higher than a set pressure, and connects the main pump cylinder and the sub-pump cylinder to make the cable gripping force of the gripping member constant. It has a relief valve to hold | maintain, 2 or 3 characterized by the above-mentioned.
The traction device according to. 5. The crank mechanism includes a crank lever having a base end portion pivotally attached to the frame, an upper end portion pivotally attached to a tip end portion of the crank lever, and the gripping member pivotally attached to a lower end portion. The lever main body and the arm portion provided orthogonal to the lever main body are formed in a substantially T shape, and when the crank lever is tilted, the upper end and the lower end of the lever main body have a base end pivot of the crank lever. The main lever is located on the opposite side in the left-right direction with respect to the landing point, and the lower end portion is pivoted below the arm portion of the lever body, and the middle portion is below the base end pivotal attachment portion of the crank lever. A swing lever pivotally attached to the frame so as to be vertically movable, a base end portion of which is pivotally attached to the frame on the side opposite to the arm portion side of the lever main body, and a tip end portion of the arm portion. Traction device according to any one of claims 1 to 4, wherein the support lever pivotally mounted, in that it consists of a. 6. The frame has a frame supporting portion that is provided so as to be movable in the vertical direction relative to the frame main body and that engages with an opening of the hole to support the frame main body. Any one of claims 1 to 5
The traction device according to. 7. The traction device according to claim 1, wherein the frame is formed so as to be capable of expanding and contracting in a lateral direction.