JP2011238676A - Electric apparatus storing box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric apparatus storing box which can prevent invasion of water, wire and the like into a box body from outside even if the box is used as an electric apparatus storing box whose thickness is close and which is equipped with a drain hole plug satisfying an IP specification being a protection class against invasion of water and invasion of external solid.SOLUTION: The electric apparatus storing box 1 is equipped with the drain hole plug 11 engaged to a drain hole 4 at a base of the box body 2 from a lower side. The drain hole plug 11 includes: a brim portion 13 abutting on the box body base, at least a pair of locking pieces 14 which are erected upward from an upper face of a drain hole plug body 12 and are locked to inside of the drain hole; drain grooves 15 formed above the brim toward an outer diameter direction of the plug body 12 between the locking pieces 14; and projections 16 arranged on inner sides of the locking pieces to block extension lines of the drain grooves 15.

Description

  The present invention relates to an electrical equipment storage box having a drain hole plug on the bottom surface of the box body.

  2. Description of the Related Art Conventionally, an electric device storage box for storing various electric devices is known in which a drain hole is provided on the bottom surface of a box body. Of the electrical equipment storage boxes, those installed outdoors have a dustproof / waterproof structure, but in the unlikely event that water enters the box body from the outside, a drain hole is formed in the box body. Yes.

  Such electric equipment storage boxes include a water draining device for preventing rainwater from entering the inside of the box body through a drain hole due to rainwater blowing back during a storm (Patent Document 1). ).

  However, although these drainage devices have a certain effect, they are complicated in structure and cannot be produced at low cost. Therefore, as shown in FIG. 8, a drain plug 21 that has a simple structure and can be manufactured at low cost is widely used.

  The drain hole plug 21 is a drain hole plug fitted from below into the drain hole on the bottom surface of the box body. As shown in FIG. A plurality of locking pieces 24 arranged in a circular shape as a whole on the upper surface of the drain hole plug main body 22 through the slit 26, and linearly from the slit 26 toward the outer diameter direction of the drain hole plug main body 22 A pair of drainage grooves 25 extended. As shown in FIG. 9, the drain hole plug 21 brings the hook 23 into contact with the bottom surface of the box body 2 when the locking piece 24 is locked inside the drain hole, so And intrusion of wire. Further, the drainage groove 25 has a function of discharging water from the inside of the box body in the event that water enters from the outside.

  Thus, the electrical equipment storage box satisfies the IP standard (IEC 60529), which is a protection class against intrusion of water and intrusion of foreign solid matter.

  However, since there are various thicknesses of electrical equipment storage boxes, there is no problem if a dedicated drain plug is made for each. Use a hole plug. Then, as shown in FIG. 10, when the thickness of the bottom plate of the box body 2 is thinner than the height H of the locking groove of the drain hole plug 21, it is used for drainage between the drainage groove 25 and the bottom surface of the box body. An unnecessarily large gap greater than the depth of the groove is generated, and a space into which water, wire, or the like enters from the outside is formed. Therefore, there is a problem that the IP standard cannot be satisfied.

JP 2005-302946 A

  The object of the present invention is to solve the above problems and to efficiently drain the water inside the box body. It is an object of the present invention to provide an electric equipment storage box provided with a drain hole plug that can prevent intrusion of water, wire or the like and can satisfy the IP standard.

  An electrical equipment storage box according to the present invention made to solve the above problems is an electrical equipment storage box including a drain hole plug fitted from below to a drain hole on the bottom surface of the box body, The drain hole plug includes a flange that contacts the bottom surface of the box body, at least a pair of locking pieces that are erected upward from the upper surface of the drain hole plug body, and are locked inside the drain hole, A drainage groove formed on the collar part from between the locking pieces toward the outer diameter direction of the plug body, and a protrusion arranged on the inner side of the locking piece so as to close the extension line of the drainage groove Part.

  In the present invention, it is preferable that the locking pieces are arranged in a circular shape as a whole and that the protruding portions are concentric with the locking pieces.

  Furthermore, in this invention, it is preferable that the said protrusion part has a notch for draining in the position remove | deviated from the extension line | wire of the said groove | channel for drainage.

  In the present invention, the drain hole plug is preferably made of a thermoplastic resin.

  The electrical equipment storage box according to the present invention includes a drain hole plug fitted from below to the drain hole on the bottom surface of the box body. Thereby, the water inside a box main body can be discharged | emitted efficiently. Further, the drain hole plug is provided with the protruding portion so as to close the extension line of the drainage groove. As a result, even if the drain hole plug is used in electrical equipment storage boxes with different plate thicknesses, water or wire etc. can be used for drainage from the gap between the drain groove of the drain hole plug and the bottom of the box body Intrusion into the box body through the groove can be prevented.

  Here, the locking piece of the drain hole plug may be arranged in a circular shape as a whole, and the protruding portion may be formed to be concentric with the locking piece. Thereby, it is easy to fit in the bottom face of the box body, and water does not collect at the four corners like a square.

  Further, the drain hole plug may be provided with a notch for draining at a position off the extended line of the drain groove on the protruding portion. Thereby, even if water gets over the said protrusion part, water can be discharged | emitted to the exterior of a box main body through the groove | channel for drainage from the notch for drainage provided in the said protrusion part.

  Furthermore, the material of the drain hole plug can be a thermoplastic resin. Thermoplastic resins are excellent in elasticity and waterproofness. Therefore, it is possible to provide a drain hole plug that can be easily fitted into the drain hole and is suitable for outdoor use.

It is a perspective view of the box for electrical equipment storage provided with the drain hole plug on the box body bottom face. It is an expansion perspective view of the said box main body bottom part in which the drain hole plug is located. It is a perspective view of the drain hole plug fitted in the drain hole of a box main body bottom face. It is a top view of the drain hole plug. It is a front view of the drain hole plug. It is a cross-sectional perspective view of the drain hole plug showing a state where a gap is generated between the bottom surface of the box body and the flange portion of the drain hole plug. It is a perspective view which shows other embodiment of the protrusion part provided in the said drain hole plug. It is a perspective view of the drain hole plug used conventionally. It is sectional drawing of the drain hole plug closely_contact | adhered with the said box main body bottom face. It is sectional drawing of the drain hole plug which shows the state which the gap more than necessary produced between the box main body bottom and the drainage groove | channel of the drain hole plug.

Preferred embodiments of the present invention are shown below.
FIG. 1 is a perspective view showing a state in which an opening / closing door 3 of an electric equipment storage box 1 having a drain hole plug 11 on the bottom surface of the box body is opened. FIG. 2 is an enlarged perspective view of the bottom surface of the box body where the drain hole plug is located. As shown in FIGS. 1 and 2, the bottom surface of the box body 2 is provided with drain holes 4 at any of the four corners, and drain hole plugs 11 for closing the drain holes 4 are attached. Yes. The drain hole plug 11 can discharge water from the inside of the box body in the unlikely event that water enters the outside of the box body while preventing water, wire, or the like from entering the inside of the box body. Hereinafter, the structure of the drain hole plug 11 will be described.

  FIG. 3 is a perspective view of the drain hole plug 11 fitted into the drain hole 4 on the bottom surface of the box body. As shown in FIG. 3, the drain hole plug 11 is erected upward from the flange 13 that contacts the bottom surface of the box body and the upper surface of the drain hole plug body 12, and is locked inside the drain hole. And at least a pair of locking pieces 14, a drainage groove 15 formed on the collar portion from between the locking pieces 14 toward the outer diameter direction of the drain hole plug body 12, and the drainage It consists of the protrusion 16 which is arrange | positioned inside the latching piece 14 so that the extension line | wire of the groove | channel 15 may be plugged up, and stood upwards from the upper surface of the drain hole plug main body 12. As shown in FIG.

  FIG. 4 is a top view of the drain hole plug 11, and FIG. 5 is a front view of the drain hole plug 11. As shown in FIGS. 4 and 5, the flange 13 has a circular thin plate shape, and its outer extension is thinned upward.

  As shown in FIGS. 3 and 4, the locking piece 14 is arranged at a position about half the inner diameter of the drain hole plug body 12, and the locking piece 14 is located above the drain hole plug 11. When viewed from above, it has a substantially circular shape as a whole. Further, the locking piece 14 has a substantially isosceles triangle cross section, and is joined to the drain hole plug main body 12 in a state where the apex of the apex angle is erected outward. Further, a plurality of slits 17 (six in this embodiment) are provided between the locking pieces 14 at a predetermined interval.

  A pair of drainage grooves 15 are provided on the collar. The drainage groove 15 is linear from the slit 17 toward the outer diameter direction of the plug body 12. It should be noted that at least one drainage groove 15 may be provided. However, when two places are provided symmetrically as in the embodiment, water can be more easily removed, and foreign matter can be removed compared to the case where the number of grooves is large. This is most preferable because the risk of intrusion is reduced.

  A protrusion 16 is disposed further inside than the locking piece 14 so as to close the extension line of the drainage groove 15. Thereby, as shown in FIG. 6, the wire can be prevented from entering the inside of the box body through the drainage groove 15. In addition, even if water enters from the outside, the water is rebounded by the protruding portion 16 and discharged to the outside. In addition, the height of the protrusion part 16 is the height which can prevent the penetration | invasion, when a wire penetrate | invades diagonally upwards from the collar part 13 inside the said box main body. The protrusion 16 is provided so as to close at least the extended line of the drainage groove 15, but is desirably arranged so as to close the extended line of the slit 17.

Although this protrusion 16 is cylindrical, a pair of drainage cutouts 18 are provided at symmetrical positions thereof. Therefore, even when water accumulates inside the protrusion 16, the water can be discharged from the drain notch 18 to the outside of the box body through the drainage groove 15.
Further, the drain notch 18 is provided at a position off the extension line of the drainage groove 15 and the extension line of the slit 17. Therefore, foreign matter does not enter from the outside through the drainage grooves 15 and the slits 17.

  In this embodiment, polyethylene (PE) is used as the material of the drain hole plug 11. Polyethylene has excellent elasticity and waterproofness in addition to the advantage of being easy to mold. Therefore, it is easy to fit in the drain hole 4 and is suitable as a material for the drain hole plug 11 used in an outdoor installation type box body.

In the above, the present invention has been described with reference to the embodiment. However, the present invention is not limited to the above embodiment, and it is needless to say that the present invention can be appropriately modified and applied without departing from the gist thereof.
For example, as shown in FIG. 7, the protrusions 16 are formed as a plurality of arcuate walls facing outward so as not to contact the locking pieces 14, or the individual grooves corresponding to the drainage grooves 15 and the slits 17. A plurality of walls may be provided. Moreover, the material of the drain hole plug may be polypropylene having the same properties as polyethylene.

DESCRIPTION OF SYMBOLS 1 Electrical equipment storage box 2 Box main body 3 Opening / closing door 4 Drain hole 11 Drain hole plug 12 Drain hole plug main body 13 Gutter part 14 Locking piece 15 Drain groove 16 Projection part 17 Slit 18 Drain notch 21 Drain hole plug 22 Drain hole plug body 23 Gutter 24 Locking piece 25 Drain groove 26 Slit
H Height of locking groove

Claims (4)

  An electrical equipment storage box having a drain hole plug fitted from the lower side to a drain hole on the bottom surface of the box body, the drain hole plug having a flange portion that contacts the bottom surface of the box body, and a drain hole At least a pair of locking pieces that are erected upward from the top surface of the stopper main body and locked inside the drain hole, and on the flange portion, from between the locking pieces toward the outer diameter direction of the stopper main body. An electrical equipment storage box comprising: a drainage groove formed on the inner side of the locking piece; and a protrusion disposed inside the locking piece so as to close an extension line of the drainage groove.   The electric device storage box according to claim 1, wherein the locking piece is arranged in a circular shape as a whole, and the protruding portion is formed to be concentric with the locking piece.   The electrical equipment storage box main body according to claim 1, wherein the protruding portion has a drainage notch at a position off the extended line of the drainage groove.   The electric equipment storage box main body according to claim 1, wherein the drain hole plug is made of a thermoplastic resin.

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