JPH0441724Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a cable box opening/closing device.
The present invention particularly relates to a cable box opening/closing device suitable for opening and closing the lids of cable boxes installed on narrow roads.

[Conventional technology]

Recently, electric wires and cables have been housed and laid underground, and cable boxes are used for this purpose. This cable box is
It is buried under the road as an underground structure with a U-shaped cross section, and the upper opening is covered with a lid that is flush with the road surface.

The lid used for this cable box is opened and closed when new cables are installed or repaired, and for this opening and closing operation, the lid is provided with embedded female screws at its four corners. When opening and closing the lid, an eye bolt is screwed onto the female thread in advance, a wire is directly hooked onto the eye bolt, and the lid is lifted by a crane truck.

[The problem that the idea attempts to solve]

However, when opening and closing the cable box lid, as mentioned above, the crane must be moved to the opening/closing position, which is not a big problem if the cable box is installed on a wide road. When it is installed on a narrow road, it is difficult to bring in vehicles, making it difficult to work in places such as arcades, for example. Further, even if there is no problem in transporting the crane truck, the work method involves directly hooking wires to the eye bolts screwed onto the lid using an on-board crane, which results in a construction method that does not allow the eye bolts to be suspended vertically. As a result, a diagonal tensile force acts on the eyebolt, crushing the threads, and making it impossible to attach or detach the eyebolt. In particular, since the female screw on the lid is embedded, the lid itself would eventually have to be replaced, which was a serious problem.

The present invention focuses on the above-mentioned conventional problems, and makes it easy to open and close the lid of a cable box, even in a narrow space, and without damaging the female threads of the lid, making it very easy to open and close the lid. The object of the present invention is to provide a cable box opening/closing device that can perform the following operations.

[Means for Solving the Problems] In order to achieve the above object, the cable box opening/closing device according to the present invention includes a trolley that is provided with a frame extending above the lid of the cable box and is movable across the cable box. and at least a pair of horizontal rods suspended from the frame via a lifting means, and bolts that can be screwed onto female screws provided at the four corners of the lid are provided on the horizontal rods in correspondence with the intervals of the female screws. The structure includes a lifting means.

[Effect]

According to the above configuration, the horizontal rod that can be raised and lowered and suspended from the frame extending above the lid of the cable box is provided with a lifting means corresponding to the interval between the female threads of the lid, so that the raising and lowering means By this operation, the eye bolt screwed onto the lid side can be pulled up vertically via the horizontal rod. As a result, a diagonal tensile force is not applied to the eye bolt screwed onto the lid, thereby preventing the internal thread embedded in the lid from being crushed. The trolley with the horizontal pole is designed to move across the cable box, and even in cases where the cable box is laid on a narrow road, the trolley's width must be increased in addition to the width of the cable box. If the wheels are wide enough, the cart can be moved sufficiently. The cable box can be opened by lifting and moving the lid and repositioning it above the adjacent lid. Therefore, there is no need for a crane truck, no space is required for carrying a vehicle, and it is possible to easily open and close the lid of the cable box on narrow roads.

〔Example〕

Hereinafter, specific embodiments of the cable box opening/closing device according to the present invention will be described in detail with reference to the drawings.

FIG. 1 is a perspective view showing the structure of a cable box opening/closing device according to an embodiment.

The cable box opening/closing device according to the embodiment is as follows:
Cable box 10 that accommodates communication cables, etc.
This is for opening and closing the lid 12 of the. The lid 12 is a rectangular slab body and is laid so as to be flush with the road surface. Such a lid 12 is provided with embedded female screws 14 at its four corners, and is configured to open and close using the embedded female screws 14. That is, the eye bolt 16 is attached to the embedded female thread 14.
This eye bolt 16 is used as a lifting means.

The cable box opening/closing device for lifting the lid 12 has a cart 20 that can move across the cable box 10 in the direction in which it is laid. This truck 20 is a rectangular frame type truck with a width slightly wider than the width of the lid 12 and a length approximately corresponding to the length of the lid 12, and has a U-shaped front truck 20A and a rear truck 20B. Connecting arm 20
The length of the trolley can be adjusted by connecting it with C. A frame 21 extending above the lid 12 of the cable box 10 is provided on the upper part of the trolley 20. That is, gate-shaped frames 22A, 22B are erected on each of the front bogie 20A and the rear bogie 20B, and the front and rear gate-shaped frames 22A, 22B are connected to each other by a connecting frame 24 extending through the center of the beam. are integrated to form a frame 21. The connecting frame 24 that connects the gate-shaped frames 22A, 22B is fitted into fitting protrusions 26A, 26B formed at the center of the beams of the gate-shaped frames 22A, 22B. , 22B can be adjusted in accordance with the length adjustment of the trolley 20.

In the frame 21, the gate-shaped frame 22
A hanging support bracket 28 is provided on the lower surface of the fitting protrusions 26A and 26B of A and 22B, and a chain block 30 as a lifting means is attached to this bracket. And chain block 3
Horizontal rods 36 are suspended from each of the hooks 32 of 0 via wires 34 of a certain length. The horizontal rod 36 is formed from a square pipe whose length is slightly shorter than the beam length of the gate-shaped frames 22A, 22B, and a pair of eye bolts 38 for connecting wires are fixed to the upper surface. Therefore, each horizontal rod 36 is connected to each eye bolt 3.
The chain block 30 is operated by two wires 34 hooked to the chain 8 so that it can be raised and lowered while maintaining a horizontal state. Further, a lifting means 40 is provided on the lower surface of the horizontal rod 36 and is connected to the lid 12 to raise and lower it. This lifting means 40 includes an eye bolt 16 screwed into the embedded female thread 14 of the lid 12, and the eye bolt 1
A holding eye bolt 42 is fixed to the horizontal rod 36 so that the mounting position of the eye bolt 6 is adapted to the interval between the female threads 14 embedded in the lid 12. A connecting fitting 44 is used to connect the holding eye bolt 42 and the lid eye bolt 16.
4, attach and detach the lid eye bolt 16 and remove the lid 12.
After the eye bolts 16 and 42 are screwed into the embedded female screw 14 of the eye bolts 16 and 42, the eye bolts 16 and 42 are connected.

The mounting position of the holding eye bolt 42 corresponds to the spacing between the embedded female threads 14 of the lid 12, but the position can be adjusted, and the mounting position of the embedded female threads 14 may vary depending on the type of cable box 10. It is now possible to deal with cases where the intervals are different.
If the size of the lid 12 is specified by a standard, the holding eye bolt 42 should be adjusted to correspond to the size of the lid 12.
All you have to do is decide the position of the screw hole for the horizontal rod 36, and if you want to apply it to different sizes, for example, provide a slide block inside the horizontal rod 36, fix the holding eye bolt 42 to this, and fix the slide block itself. It may be possible to fix the position using a tightening bolt through an elongated hole opened in the horizontal rod 36.

Further, the trolley 20 is equipped with wheels 46 on the lower surface of its corner portion, and can move along the laying direction of the cable box 10 by means of the wheels 46. Cross section U along both side edges of box 10
A letter-shaped rail 48 is temporarily laid.
This facilitates the positional movement of the cart 20, and enables accurate positioning of the embedded female screw 14 of the lid 12 and the lifting means 40. Furthermore, one of the wheels 46 has a caster structure, and the other is a fixed wheel equipped with a brake. This makes it possible to lift the fixed wheels and connect it to a vehicle and move it to the site, or it is also possible to move it over short distances without loading it onto a vehicle. Note that the swivel casters may be fixed with pins or the like for straight-line running.

The operation of the cable box lid opening device constructed as described above is as follows. In advance, a rail 48 is laid on the side of the cable box 10, and the wheels 46 of the assembled truck 20 are installed so as to fit on the rail 48. Then, a lid eye bolt 16 is screwed onto each embedded female screw 14 of the lid 12 to be lifted, and the chain block 30 is operated to lower the horizontal rod 36. The lid eye bolt 16 and the holding eye bolt 42 on the horizontal pole 36 side are connected at all four locations by a connecting fitting 44,
A horizontal rod 36 is raised by a chain block 30. As a result, as shown in FIG.
By moving the cable box 10 at a desired position, the cable box 10 is opened. When the lid 12 is moved by the cart 20, it swings back and forth, but the horizontal rod 3
6 and the cross members of the front truck 20A and rear truck 20B interfere with each other and act as a stopper, so that an effect of preventing shaking is obtained and the risk of damage to the lid 12 can be avoided. In addition, when the lid 12 is to be returned to its original position, the operation described above may be performed in reverse.

According to this embodiment, the cable box 10
The heavy lid 12 can be opened and closed without using a crane truck. Since the trolley 20 is configured to straddle the cable box 10, it can be used even when the space on the side of the cable box 10 is not large, and is especially useful for cable box lids installed in arcades and alleys with narrow roads. Great for opening and closing. In order to lift the eye bolt 16 which is screwed onto the embedded female thread 14 of the lid 12, the eye bolt 16 is lifted up via the lifting means 40 corresponding to the spacing between the embedded female threads 14. Only a tensile force acts, and no diagonal tensile force that would crush the threads occurs. Therefore, there is no risk of damage to the threads of the embedded female screw 14 due to the operation of opening and closing the lid 12, so the work can be performed with high safety, and the rate of replacement of the lid 12 due to damage can be significantly reduced. be able to.

Here, in the above embodiment, the front and rear gate type frames 2
Although each of 2A and 22B is equipped with a chain block 30 to lift the lid 12, a chain block 30 may be installed in the center of the connecting frame 24 and the lid 12 can be lifted by one chain block. In this case, horizontal rod 3
This can be realized by connecting the 6 pieces together and simultaneously hanging the wires hooked to the hook connecting eye bolts 38 at four locations to the hooks of the central chain block. Even in this case, the embedded female thread 14 of the lid 12 will not be damaged.

Also, in the frame 21 on the trolley 20,
It is not limited to the gate-shaped frames 22A, 22B, but any suitable structure may be used, as long as the cable box lid can be raised and lowered using the space above it.

Furthermore, for short-distance movement, as shown by the imaginary line in FIG. 4, a cart lifting caster is attached to the front edge of the front cart 20A so as to be able to rotate up and down, making it possible to move the cart without loading it into the vehicle. If you do not want to move it, just turn it around and store it above.

[Effect of idea]

As explained above, according to the present invention, the space above the lid is used to lift the lid of a cable box installed on a narrow road, so it is easy to open and close the lid of a cable box installed on a narrow road. It is possible to open and close the lid, and it also has the effect of preventing the situation where the screw thread of the female screw embedded in the lid is crushed and the lid itself has to be replaced.

[Brief explanation of the drawing]

Fig. 1 is an explanatory perspective view of the structure of the cable box opening/closing device and the cable box lid according to the embodiment, Fig. 2 is a front view of the cable box opening/closing device in use, and Fig. 3 omits the chain block. FIG. 4 is a side view of the same. 10...cable box, 12...lid, 14
...Embedded female thread, 16...Eye bolt, 20...
Dolly, 21...frame, 30...chain block (lifting means), 36...horizontal rod, 49...lifting means.

Claims (1)

[Scope of utility model registration request] A cart having a frame extending above the lid of the cable box and capable of moving across the cable box, at least a pair of horizontal rods suspended from the frame via lifting means, and horizontal rods provided at four corners of the lid. A cable box opening/closing device comprising a lifting means provided on the horizontal rod with bolts that can be screwed into female screws arranged in a manner corresponding to the spacing of the female screws.