JPH0239744Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention is a pipe connection method that enables pipe connections to be made from the ground outside an excavated trench in the installation work of underground communication cable pipes. The present invention relates to a device for opening and closing a tube gripper of the device.

[Technical background of the invention and its problems]

Conventionally, a tube gripper (Utility Application No. 128319/1983) as shown in FIGS. 7 to 9 has been proposed as a tube connecting device of this type.

That is, FIG. 7 is a schematic diagram of the pipe connection device, FIGS. 8a, b, and c are plan views, front views, and side views showing the gripping portion of one tube gripper 21b, and FIG. 9 is a diagram showing the gripping portion of the other tube gripper 21b. It is a plan view showing the grip part of the container 21a, 30 is a long rod, 31 is a tube abutment provided at the lower end of the rod 30, and 32 is a diamond-shaped set of four sets of upper and lower double strips 35. It is an extensible body made by crossing two sets of strips 35 in a pantograph shape, and the intersections of the two sets of strips 35 are joined by a rod 30 and extended to the other side, and each of the two sets of strips 35 is extended to the other side. An arm 34 to which a side gripper 33 is attached is articulated and supported. As shown in FIG. 8b, the lower end of the side gripper 33 is bent into an arc shape so as to expand outward so that it can be easily fitted into a tube. The other three intersections of the strip 35 are articulated with pins 36, 37, 38. Further, another short strip 39 is connected to the pin 36, and this short strip 39 is provided with a roller 40 that can roll on the tube surface in order to smoothly exert the tube clamping force by the gripper. In the gripper 21a, the base end of the hydraulic jack 24 is connected to the mounting piece 45 with a pin 25 as shown in FIG. A hook 27 is provided as a hydraulic jack mounting piece into which the ring portion 26 is fitted. 41 is pin 3
It is a spring that is stretched between 7 and 38 and always tries to contract, and acts to reduce the distance between the side grippers 33 and 33 on both sides. Reference numeral 42 denotes a stopper for maintaining an appropriate distance between the side grippers 33 on both sides by the force of the spring 41 so that the distance between them does not become too narrow when the tube is not gripped.

That is, holding the grippers 21a, 21b and their rods 30, insert the pipe 4 from the ground between the side grippers 33, 33.
3 and 44 and push it, the side gripper 3
3, 33 are pipes 43, 44 from the widening part at the bottom.
The space between the side grippers 33, 33 on both sides widens slightly against the force of the spring 41, and the tube 4
Fits in 3,44. Once fitted, the force of the spring 41 will lightly grip the tube. Next, the hydraulic jack 24 is held on the ground by a holder (not shown) in which the L-shaped bent portion at the tip of the operating rod 28 is provided on the gripper 21a.
Fit the ring part 29 at the tip of the gripper 21b, remove it from the holder, fold it down, and place the ring part 26 at the tip of the gripper 21b.
Fit and lock the hook 27. Next, the power source 23 installed on the ground is operated to retract the hydraulic jack 24. Due to the force of the hydraulic jack 24 at that time, the extensible body 32 tries to extend in the machine axis direction, and the side grippers 33, 33 on both sides of both grippers 21a, 21b
In an attempt to reduce the distance between the tubes 43 and 44, the tubes 43 and 44 are grasped with strong force, and at the same time, the tube 44 is drawn toward the tube 43, and the two tubes are connected. If the pipe to be connected requires a large insertion force, such as a steel pipe, firmly grip the pipe with a large force corresponding to the insertion force required. In addition, in the case of a weak material such as a resin pipe that requires a small insertion force, the pipe is gripped with a corresponding force that is not very strong, and the pipe of low strength is not crushed.

Note that in the embodiment described above, the gripper 21a
Although the hydraulic jack 24 was connected and supported, the hydraulic jack 24 was separated from the gripper 21a, and
This hydraulic jack 24 is attached to the lower end of the long rod, and the gripper 21a side is provided with a hook similar to the gripper 21b, and the base end side of the hydraulic jack 24 is also provided with a ring portion that fits into the hook. 24 may be attached to both grippers from the ground using rods. Further, the remote-controlled pipe puller is not limited to a hydraulic jack, but may be one that operates electrically.

As described above, the gripper does not have a mechanism for opening and closing the side grippers, and in a normal state, the side grippers are closed because the spring is working to obtain the initial gripping force. For this reason, when installing it in a connecting pipe, it had to be pushed in against this spring, and when it was removed, it had to be pulled out, making it extremely difficult to handle.

As mentioned above, grippers have poor handling properties, so in order to improve these points, it is desirable to have a tube gripper that is even lighter and has a gripper opening/closing device attached. do not have.

[Purpose of invention]

The present invention was developed in view of the above points, and by adding a mechanism for opening and closing the side gripper to the tube gripper and suspending it using a rope, etc., it is possible to reduce the weight of the tube and make it easier to handle. The object of the present invention is to provide a gripper opening/closing device.

[Example of idea]

Figure 1 and Figures 2a, b, and c are examples of the present invention, and the same parts as in Figures 7, 8, a, b, and c, and Figure 9 are denoted by the same reference numerals and explained. omitted.

In FIGS. 1 and 2a, b, and c, 51 is a rope that is fixed to a pin 30' corresponding to the rod 30 of the gripper so as to hang the grippers 21a and 21b. 52 is a tubular outer wire;
The end is fixed to pin 30'. 53 is the outer wire 5
An inner wire is provided in the inner wire so as to be freely movable in the axial direction, and one end thereof is fixed to a protruding pin 36' extending upwardly from the articulation pin 36. The outer wire 52 and the inner wire 53 are led out to the ground along a rope 51 and connected to a grip 54.

As shown in FIGS. 3a and 3b, this grip 54 is constructed by having one end of a rotating member 56 pivotally attached to a fixed member 55, and a holding member 57 provided on the fixed member 55. The other end of the outer wire 52 is fixed to the fixing member 57, and the inner wire 53 is fixed to the fixing member 56.
The other end is fixed.

That is, the grip 54 is normally in a state in which the fixed member 55 and the rotating member 56 are opened, as shown in FIG. 33, 33 is in a state where the interval has shrunk.

When the fixed member 55 and rotating member 56 of the grip 54 are closed as shown in FIG. 3b, the grip 54 and the inner wire 53 are connected by a hinge structure, and the inner wire 53 is pulled against the outer wire 52. As a result, the extensible body 32 tries to contract in the tube axis direction, opening the space between the side grippers 33, 33 of both grippers 21a, 21b, and hooking the holding member 57 to keep the grip 54 closed. As a result, the side grippers 33, 33 remain open, and in this state they are carried into the groove and set onto the tubes 43, 44.

Next, when the holding member 57 is removed and the fixed member 55 and the rotating member 56 are opened, the inner wire 53 returns to the outer wire 52 due to the force of the spring 41, and the extensible body 32 is extended in the tube axis direction. The grippers 33, 33 close and grip the tubes 43, 44.

Next, when the hydraulic jack 24 is pulled by the power source 23 on the ground, due to the pantograph-like structure, a gripping force and a pulling force for the tubes are simultaneously exerted to connect the mutual tubes.

After completing the connection, close the fixed member 55 and rotating member 56 of 54 (the state shown in FIG. 3a) and remove the side gripper 3.
3, 33 are opened, the holding member 57 is hung, and the next connection is made.

Note that this example is an example in which the outer wire is attached to the intersection of strips to which side grippers are attached, and the inner wire is attached to the intersection of strips to which side grippers are not attached. The attachment positions of the wire and inner wire may be reversed.

Further, in this embodiment, the connecting device is suspended and lifted using a rope that is lightweight and easy to handle, but a handle or the like may also be used.

4 to 6 show other embodiments of the present invention,
Functional parts that are the same as those in FIGS. 1 to 3 are given the same reference numerals, and their explanations will be omitted. 4 to 6, one end of the inner wire 53 is attached to a mounting member 58, into which a pin 36' is inserted and locked. The mounting member 58 is provided with a guide groove into which a pin 30' is loosely inserted, and the pin 30' slides in the tube axis direction. Further, the strip piece 35 is formed to have a wide width, and the side gripper 33 is formed to have a thick wall.
Only the contact portions with the tubes 43 and 44 are formed into a curved concave shape. Further, the fixed member 55 and the movable member 56 of the grip 54 are formed into a bent shape. Further, the outer wire 52 is attached to the tip of the fixed member 55, and the inner wire 53 is attached to the rotating member 56 through the inside of the tip of the fixed member 55. Reference numeral 59 denotes a mounting portion to the hydraulic jack 24.

[Effect of idea]

As explained above, the present invention is easy to handle because it can be installed and removed with the side gripper open, and when the handle is replaced with a rope, it is lighter and easier to handle. Improved.

[Brief explanation of the drawing]

1 to 3 show an embodiment of the present invention, FIG. 1 is a schematic side view, FIG. 2a is a plan view of the grip,
Figure 2b is the same front view, Figure 2c is the same side view, and Figure 2c is the same side view.
The figure shows a side view of the grip, a is in the open position,
b shows the closed state, Figs. 4 to 6 show other embodiments of the invention, Fig. 4 is a schematic side view, Fig. 5a is a plan view of the grip, and Fig. 5b is the same front view. Fig. 5c
6 shows a side view of the grip, and FIG. 6 shows a side view of the grip.
a is closed state, b is open state, Figures 7 to 9
The figures show an example of a conventional pipe connection device, with FIG. 7 being a schematic side view, FIG. Side view,
FIG. 9 is a plan view of the other gripping section. 54...Grip, 52...Outer wire, 53...
... Inner wire, 24 ... Hydraulic jack, 51 ... Rope, 32 ... Expandable body, 33 ... Side gripper,
34...Arm, 41...Spring, 55...
Fixed member, 56... Rotating member, 57... Holding member.

Claims (1)

[Scope of utility model registration request] A stretchable body is provided in which strips are combined in a pandagraph shape in which the strips are crossed in a rhombus shape, and each intersection is connected with a pin, and each intersection corresponds to a predetermined joint pin of the stretchable body. The strips connected to each other at the joint part are extended to jointly support arms each having a side gripper attached thereto, so that the arms are always compressed between the joint pins on both sides adjacent to the predetermined joint pin. In a tube gripper equipped with a working spring, one end of an outer wire and an inner wire are attached to the above-mentioned predetermined articulation pin and an articulation pin opposite to this articulation pin, respectively, and the ends of the outer wire and the inner wire are A tube gripper opening/closing device characterized in that the other end is attached to a grip to move the inner wire in the axial direction with respect to the outer wire.