JP2004063872A - Box - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce costs and to shorten the delivery date of a product by reducing working processes of a box body. <P>SOLUTION: In an in-pole box provided with a box body 1 of a container-like member, whose front side is opened for installing electric equipment and a terminal stand and an upper lid 2 for closing the front opening of the box body 1, the box body 1 is a resin-molded good and when molding the box body 1, wire passing holes 11 and 12 are molded simultaneously, to eliminate post-working (boring work). In addition, the box body 1 is provided with an air hole, such that even if a change in ambient temperature or the like occurs, the inside of the box does not become negative pressure. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a box housed in a pole such as a lighting pole installed on a road or a park.
[0002]
[Prior art]
In a lighting pole installed on a road or a park, a window is provided at a position of about 50 to 100 cm from the ground, and a connection box is stored in the pole.
[0003]
The box installed in the pole includes a box main body having an open front side and an upper lid for closing the front opening of the box main body, and electric equipment such as a breaker and a terminal block are housed inside the box. The box is provided with a communication hole, and has a structure in which a power supply line, an output line, a control line, and the like and each device are connected in the box.
[0004]
The box installed in the pole is of a closed structure, and functions to protect the internal devices and connection parts from external force, humidity, and the like.
[0005]
[Problems to be solved by the invention]
By the way, in the conventional box, the through-hole is not formed when the box body is manufactured, and the through-hole having a diameter and a number of holes is provided as required by post-processing. However, in drilling by post-processing, it takes time and effort to process through-holes, which is not rational and has problems in cost and product delivery.
[0006]
Further, in the box housed in the pole, negative pressure may be generated inside the box due to severe conditions such as a rapid and large change in the ambient temperature. Depending on the degree of the negative pressure, the state of deterioration of the packing, and the like, the waterproofness may be impaired.
[0007]
Furthermore, in the conventional box, since the upper lid is fixed to the box main body by the metal fittings provided above and below the box, the upper lid must be aligned with the box main body, and the lid stopper must be handled while being held. In particular, the lower bracket is difficult to work, and the workability is poor.
[0008]
The present invention has been made in view of such circumstances, and has as its object to provide a box capable of reducing the number of processing steps of a box main body, reducing costs and shortening a product delivery time, and improving workability. And
[0009]
Another object of the present invention is to provide a box that can more reliably prevent water from entering the box. Still another object of the present invention is to provide a box in which an upper cover can be easily attached.
[0010]
[Means for Solving the Problems]
The box of the present invention is a box installed in a pole such as a lighting pole, which is a container-like member having an open front side, and a box body in which electric devices such as a breaker and a terminal block are installed. It is characterized by having an upper lid for closing the front opening of the box main body, the box main body being a resin molded product, and the through-holes being formed at the same time when the box main body is formed.
[0011]
According to the box of the present invention, since the through holes are formed at the same time when the box body is formed, it is not necessary to form a through hole in the box body (post-processing), and the number of processing steps can be reduced. it can. In addition, since the through hole is a female screw hole, a cable connector or the like can be attached to the box body without using a lock nut.
[0012]
In the box of the present invention, it is preferable to provide a ventilation hole (breathing hole) in the box body. By providing the ventilation holes, even if a sudden change in the ambient temperature occurs, the inside of the box does not become negative pressure, and water can be more reliably prevented from entering the inside of the box from around the sealed portion. .
[0013]
As a more specific configuration of the box of the present invention, a locking piece is provided at the lower portion of the upper lid, and a locking hole (or locking groove) into which the locking piece can be inserted is provided at the lower portion of the box body. A structure in which a lid stopper for fixing the upper part of the upper lid is provided on the upper part of the box body can be cited.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0015]
FIG. 1 is an external perspective view of an embodiment of the present invention. FIG. 2 is a front view (A) and a side view (B) of the embodiment of the present invention. 3 and 4 are a plan view and a bottom view, respectively, of the embodiment of the present invention. FIG. 5 is a sectional view taken along line XX of FIG. FIGS. 6A and 6B are a sectional view of the box body 1 and a sectional view of the upper lid 2, respectively. The illustration of the internal mechanism is omitted in FIG.
[0016]
The box of this example is a box of a waterproof / dustproof structure installed in a lighting pole, and includes a box body 1 having an open front side and an upper lid 2 for closing a front opening 10 of the box body 1. ing.
[0017]
The upper lid 2 is a molded product of a transparent resin such as an AS resin or a methacrylic resin. As shown in FIGS. 5 and 6, two locking pieces 21 and 21 are integrally formed on the upper and lower portions, respectively. A groove 22 is formed on the entire periphery of the upper lid 2, and the sealing packing 6 (for example, EPT rubber) is fitted into the groove 22. The upper lid 2 has a vertically symmetric structure.
[0018]
As shown in FIG. 7, a breaker 7 and a terminal block 8 are mounted on the box body 1.
[0019]
The box body 1 is a resin molded product such as an ABS resin or a phenol resin. Two through holes 11 (power supply side) are provided at two lower portions of the box body 1. In addition, through holes 12 (lamp side) are provided at three places on the upper part of the box body 1. These through holes 11 and 12 are formed at the same time when the box body 1 is formed.
[0020]
The through hole 11 on the power supply side is a female screw hole having a female screw (parallel screw for pipe) 11a formed on the inner peripheral surface. The cable connectors 4 are screwed into the respective communication holes 11 on the power supply side. A rubber packing 9 is fitted into the mating surface between the cable connector 4 and the box body 1.
[0021]
A cylindrical boss 12a protruding outward is integrally formed around the periphery of the lamp side communication hole 12, and a locking projection 12b is formed over the entire periphery at the tip periphery of the boss 12a ( 5 and 6). A rubber sleeve 5 is provided in each of the through holes 12 on the lamp side.
[0022]
The diameters and the numbers of the power supply-side communication holes 11 and the lamp-side communication holes 12 are determined, for example, by analyzing past shipping data and designing from the most frequently shipped product pattern.
[0023]
A support piece 13 is formed integrally with a lower portion of the box body 1. The support pieces 13 are provided with locking holes (slit holes) 14 into which the locking pieces 21 of the upper lid 2 can be inserted, with a positional relationship corresponding to each locking piece 21. Note that a locking groove may be provided instead of the locking hole 14.
[0024]
On the upper part of the box main body 1, a lid stopper 3 is arranged. The lid stopper 3 is provided rotatably with respect to the box main body 1 about a horizontal direction (horizontal direction), and locks the lower locking pieces 21 and 21 of the upper lid 2 with the box main body 1. The upper cover 2 is inserted into the holes 14, 14, and the upper cover 2 is aligned with the box body 1, and the cover stopper 3 is rotated to engage with the locking pieces 21, 21 on the upper cover 2, thereby to put the upper cover 2 in the box. It can be fixed to the main body 1 and the tightness of the joint between the box main body 1 and the upper lid 2 can be ensured.
[0025]
A circular recess 15 is provided in the lower center of the box body 1, and a plurality of ventilation holes (breathing holes) 16 are provided in the recess 15. These ventilation holes 16 penetrate the wall of the box body 1.
[0026]
A mounting hole 17 is provided in a wall on the back side of the box main body 1, and the box main body 1 is mounted on a mounting plate S (FIG. 3) in the lighting pole P using the mounting hole 17. be able to.
[0027]
According to the embodiment of the structure described above, since the through holes 11 and 12 are formed at the same time when the box body 1 is formed, the boring (post processing) of the through holes 11 and 12 becomes unnecessary, and the processing is performed. The number of steps can be reduced.
[0028]
Further, since the ventilation hole 16 is provided in the lower portion of the box body 1, even if a sudden change in the ambient temperature occurs, the inside of the box does not become negative pressure, and the sealed portion (the box body 1 and the upper lid 2 are closed). It is possible to prevent water from entering from the periphery.
[0029]
Further, a lid stopper 3 for fixing the upper lid 2 to the box main body 1 is provided only at the upper portion, and the lower end of the upper lid 2 has a structure in which the locking piece 21 is inserted into the locking hole 14 of the box main body 1. Can be easily installed. In addition, since the lower end of the upper lid 2 is locked to the box body 1 via the locking piece 21 in a state where the upper lid 2 is attached, the lid stopper 3 does not easily come off even if vibrations or the like act on the box.
[0030]
Further, in the present embodiment, since the corners on both sides of the upper lid 2 and the corners on both sides on the back side of the box body 1 are chamfered, as shown in FIG. It can be stored in P. Further, since the upper lid 2 has a vertically symmetric structure, there is no need to consider the upper and lower sides of the upper lid 2 when attaching the upper lid 2 to the box body 1.
[0031]
Next, each configuration of the cable connector 4 and the rubber sleeve 5 will be described below.
[0032]
<Cable connector>
As shown in FIGS. 5 and 8, the cable connector 4 includes a connector main body 41, a contraction tube 42, and a spiral core 43.
[0033]
The connector main body 41 is a resin molded product such as a polypropylene resin, and is integrally formed with a screw portion 41a having a male screw (parallel tube screw), a hexagonal nut portion 41b, and a sleeve 41c.
[0034]
The shrink tube 42 is a molded product of EPDM (ethylene / propylene / rubber), and has a spiral core 43 made of plastic (for example, polypropylene resin) inserted therein as shown in FIG.
[0035]
The spiral core 43 has a structure in which the band-shaped member 43a is spirally wound. By pulling the end of the band-shaped member 43a along the axial direction of the shrinkable tube 42, the entire spiral core 43 is pulled out to the outside. The shrinkable tube 42 shrinks to have a structure in which the shrinkable tube 42 comes into close contact with the jacket of the cable C (FIG. 8B).
[0036]
When the cable connector 4 having the above structure is used, the following effects can be achieved.
[0037]
First, conventionally, as a cable connector, as shown in FIG. 11, a connector body 101, a conical tapered rubber sleeve 102 and a cap 103 are provided. In general, a structure is used in which a cable C is passed through a sleeve 102 and the rubber sleeve 102 is fastened to the connector main body 101 with a cap 103 so that the rubber sleeve 102 is brought into close contact with the jacket of the cable C.
[0038]
However, in such a cable connector, it is necessary to select a connector size and a rubber sleeve size according to a wire diameter to be used. In addition, since the operation of tightening the cap is required, there is a problem that the workability is poor in a narrow pole and that the tightening force of the rubber sleeve varies.
[0039]
Further, adverse conditions may overlap, and the cap may be loosened due to vibration, resulting in reduced waterproofness. In addition, since the cable jacket is locally tightened, if the cable jacket becomes thin and thin due to aging, the waterproofness may be reduced.
[0040]
On the other hand, the cable connector 4 used in the present embodiment has an advantage that the range of the connectable cable outer diameter is wide because the contraction range of the contraction tube 42 is large. In addition, the work of tightening the cap is not required at the time of construction, so that the workability is good and the variation in the tightening force of the cable is small.
[0041]
In addition, due to the combination of adverse conditions, the waterproof property does not decrease due to rare vibrations, and even if the cable jacket becomes thinner and thinner due to aging, the shrinkable tube 42 shrinks following the thinning. , Stable water resistance can be maintained for a long time.
[0042]
<Rubber sleeve>
As shown in FIGS. 9A and 9B, the rubber sleeve 5 is a molded article of rubber such as EPT or NBR, in which a sleeve main body 51 and a seal member 53 are integrally formed.
[0043]
The outer peripheral surface of the sleeve body 51 is processed into a conical taper shape. Since the outer diameter of the sleeve main body 51 is larger than the inner diameter of the boss 12a of the box main body 1, the outer peripheral surface (conical tapered surface) is brought into close contact with the inner surface of the boss 12a by pushing the sleeve main body 51 into the boss 12a and mounting it.
[0044]
Six sleeve layer through holes 52 extending in the axial direction are formed in the sleeve body 51. These electric wire layer through holes 52 are arranged rotationally symmetrically with respect to the central axis of the sleeve main body 51. In each of the electric wire layer through holes 52, a partition wall (knockout member) 52a that can be pierced by a tool such as an electric wire or a drill is provided.
[0045]
The seal member 53 is a skirt-shaped (cylindrical) member that extends with a uniform thickness from the periphery of the large-diameter end of the sleeve main body 51, and has flexibility that can be folded toward the small-diameter side of the sleeve main body 51. have.
[0046]
When the above rubber sleeve 5 is used, as shown in FIG. 10A, the electric wire layer through holes 52 of the sleeve main body 51 are opened in accordance with the number of lead wires (for example, wiring of a ballast) into the box. The electric wire W is passed through each electric wire layer through hole 52.
[0047]
Next, as shown in FIG. 10B, the sleeve main body 51 is pushed into the boss 12a of the box main body 1 and mounted. When the sleeve body 51 is pushed into the boss 12a, the sleeve body 51 is compressed on the inner surface of the boss 12a, and the inner surface of each wire layer through hole 52 comes into close contact with the jacket of the electric wire W.
[0048]
After the above mounting is completed, the seal member 53 of the rubber sleeve 5 is folded back toward the small diameter side of the sleeve main body 51 as shown in FIG. When the seal member 53 is folded back, the end of the boss 12a to which the sleeve body 51 is mounted is covered with the seal member 53, and that portion is sealed, so that the seal by the seal member 53 and the outer periphery of the sleeve body 51 Due to the double sealing effect of the seal due to the close contact between the surface (conical tapered surface) and the inner surface of the boss 12a, high waterproofness, dustproofness and oil resistance can be obtained.
[0049]
Moreover, since the folded seal member 53 is hooked on the locking projection 12b at the tip of the boss 12a (FIG. 10 (C)), even if an external force acts on the electric wire W, the sleeve main body 51 may move in the removal direction, There is no risk of problems such as falling off, and stable sealing performance can always be maintained.
[0050]
【The invention's effect】
As described above, according to the present invention, since the through-holes are formed at the same time when the box body, which is a resin molded product, is formed, post-processing of the through-holes is unnecessary and the number of processing steps can be reduced. . Thereby, cost reduction and product delivery time can be reduced.
[0051]
In addition, since a ventilation hole (breathing hole) is provided in the lower part of the box body, even if the ambient temperature changes suddenly, the inside of the box does not become a large negative pressure, and the inside of the box from the vicinity of the sealed part Water can be prevented from entering.
[0052]
Further, since the lid stopper for fixing the upper lid to the box body is provided only on the upper portion, the mounting operation of the upper lid can be easily performed. In addition, even if a rarely occurring vibration or the like acts on the box, the lid stopper is unlikely to come off.
[Brief description of the drawings]
FIG. 1 is an external perspective view of an embodiment of the present invention.
FIG. 2 is a front view (A) and a partially cutaway side view (B) of the embodiment of the present invention.
FIG. 3 is a plan view showing an embodiment of the present invention in use.
FIG. 4 is a bottom view of the embodiment of the present invention.
FIG. 5 is a sectional view taken along line XX of FIG. 2;
FIG. 6 is a diagram showing both a sectional view (A) of the box body and a sectional view (B) of the upper lid.
FIG. 7 is a front view showing the embodiment of the present invention with the upper lid removed.
FIG. 8 is a cross-sectional view showing a configuration and a use state of the cable connector used in the embodiment of the present invention.
FIG. 9 is a front view (A) and a central longitudinal sectional view (B) of a rubber sleeve used in the embodiment of the present invention.
FIG. 10 is an explanatory diagram of a mounting procedure of the rubber sleeve shown in FIG. 9;
FIG. 11 is a half sectional view showing an example of a conventional cable connector.
[Explanation of symbols]
1 Box body 10 Front opening 11 Communication hole (female screw hole)
12 communication hole 12a boss 12b locking projection 13 support piece 14 locking hole 15 recess 16 ventilation hole (breathing hole)
17 Mounting hole 2 Upper lid 21 Locking piece 3 Lid stopper 4 Cable connector 41 Connector body 42 Shrink tube 43 Spiral core 43a Band member 5 Rubber sleeve 51 Sleeve body 52 Electric wire insertion hole 52a Partition wall 53 Seal member 6 Sealing packing 7 Breaker 8 Terminal block 9 Rubber packing C Cable W Electric wire

Claims (4)

A box installed in a pole such as a lighting pole, which is a container-shaped member having an open front side, in which an electric device and a terminal block are installed, and an upper cover for closing a front opening of the box main body. And a box main body is a resin molded product, and a through hole is formed at the same time when the box main body is formed. The box according to claim 1, wherein the through hole is a female screw hole. The box according to claim 1, wherein a ventilation hole is provided in the box body. A locking piece is provided at a lower part of the upper lid, and a locking groove or a locking hole into which the locking piece can be inserted is provided at a lower part of the box main body, and at an upper part of the box main body, The box according to any one of claims 1 to 3, wherein a lid stopper for fixing an upper portion of the upper lid is provided.

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