JP2003332762A - Casing structure for outdoor installation - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric apparatus for outdoor installation constituting a casing that collars 13, 14 formed at joining parts of a pair of casing half- bodies 11, 12 made of a metal are fastened to each other to have watertightness, wherein an electrochemical corrosion is prevented. <P>SOLUTION: A casing structure is constituted by a through hole 15 opened in a collar 13 of a first case half-body 11, a tapered hole 17 which is formed in a collar 14 of a second case half-body 12 and reduces toward the through hole 15 of the first case half-body 11, a nut member 3 which is formed with the same metal as a case 1 and engages with the tapered hole 17 so as to disable a relative rotation, a resin coated layer 4 formed so as to coat an outer peripheral surface of the nut member 3, and a fastner 2 formed with a different metal from the case 1. The fastners 2 are inserted through the through hole 15 of the first case half-body 11 and the tapered hole 17 of the second case half-body 12, and a screw shaft 21 is screwed to an inner screw 33 of the nut member 3. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a housing in which electric parts are to be built in an electric device installed outdoors such as a base station of a mobile phone.

[0002]

2. Description of the Related Art In a PHS (Personal Handy Phone System), a plurality of base stations are placed outdoors at appropriate places, and the base stations perform telephone communication by wireless communication between a handset and a nearest base station. By relaying telephone communication with the line, a call can be realized between PHS slaves or with another telephone.

In a PHS base station, as shown in FIG. 4, a pair of aluminum alloy case halves (11) and (12) are joined together to form a liquid-tight case (1). By incorporating a plurality of electrical components inside the case (1),
A base station unit is configured. The base station unit
In general, since it is attached to a pillar standing upright outdoors, the case (1) of the base station unit is required to have high liquid tightness. Therefore, conventionally, a pair of case halves (11) and (12) forming the case (1) are provided with flange portions (13) and (14) so as to project from both flange portions (13) and (14).
Are fastened to each other firmly by a plurality of fasteners (2).

5 (a) and 5 (b) show a fastening structure using the fastener (2). A through hole (15) having a circular cross section is formed in the collar portion (13) of the first case half body (11), and the through hole is formed in the collar portion (14) of the second case half body (12). An inner screw (16) is formed coaxially with (15). The fastener (2) comprises a head (22) and a screw shaft (21), the screw shaft (21) passing through the through hole (15) of the first case half (11) and the second case half (11). The case halves (11) and (12) are fastened by being screwed into the inner screw (16) of the body (12).

In the base station unit, an O-ring (not shown) is interposed between the joint surfaces of the collar portions (13) and (14) of both case halves (11) and (12) to ensure complete waterproofing. Has been planned.

[0006]

However, the above-mentioned O
Since the ring is installed on the inner side of the fastening portion by the fastener (2), rainwater and the like are exposed to wind and rain over a long period of time when the base station unit is exposed to wind and rain, and both case halves (11) (12). ) Collar part
(13) It penetrates between the joint surfaces of (14) and reaches the fastening part by the fastener (2). Here, both case halves (11) and (12) are made of aluminum alloy for weight reduction and measures against unwanted radiation, while the fastener (2) is made of stainless steel for increasing fastening force. Therefore, in the fastening portion, metals having different ionization tendencies, that is, aluminum alloy and stainless steel come into contact with each other, and the contact portion is exposed to water, so that iron is eluted from the fastener (2). , There was a problem causing corrosion.

Therefore, an object of the present invention is to provide a housing structure for outdoor installation which is free from the risk of electrochemical corrosion as described above.

[0008]

A housing structure for outdoor installation according to the present invention comprises a case (1) constructed by joining a pair of metal case halves (11) and (12), and Through hole (15) formed in the collar portion (13) of the case half body (11) of the second case half body (1)
In the collar portion (14) of 2), the through hole (15) of the first case half body (11).
And a taper hole (17) formed coaxially with the through hole (15) and having a tapered surface that shrinks toward the through hole (15), and the same material as the case (1) or a metal having an ionization tendency similar to that of the case (1). A nut having an outer peripheral surface including a taper surface to be slidably in contact with the taper surface of 17) and an inner screw (33) penetrating the central portion, and engaging with the taper hole (17) in a non-rotatable manner. Element
(3) and at least the second outer surface of the nut member (3)
The resin coating layer (4) formed so as to cover the contact surface of the case half body (12) with the collar portion (14) and the case (1) are made of a different material or a metal having a different ionization tendency. (22) and a screw shaft (21), which are inserted into the through hole (15) of the first case half body (11) and the taper hole (17) of the second case half body (12) to form the screw. The shaft (21) is attached to the inner screw (3
It is composed of a fastener (2) screwed to 3).

In the above-described outdoor installation casing structure of the present invention, by tightening the fastener (2), the fastener is
A pinching force is generated between the nut member (3) and the nut member (2), and the pinching force causes the collar portion (13) of the first case half body (11) and the collar portion of the second case half body (12). (14) are pressed against each other, and the outer peripheral surface of the nut member (3) is a tapered hole of the second case half body (12).
It is pressed against the inner peripheral surface of (17). Here, since the outer peripheral surface of the nut member (3) and the inner peripheral surface of the tapered hole (17) of the second case half body (12) are formed with tapered surfaces that are in sliding contact with each other,
With the tightening of the fastener (2), both tapered surfaces exert a wedge effect, and the fastening force increases.

Further, since the resin coating layer (4) is formed on at least the contact surface of the nut member (3) with the second case half body (12), the nut member (3) is not attached. The resin coating layer (4) is interposed between the forming metal and the metal forming the second case half body (12), and the two metals do not come into direct contact with each other. Therefore, even if there is a difference in the ionization tendency of both metals, electrochemical corrosion does not occur in the fastener (2).

Specifically, the case (1) is made of an aluminum alloy, and the nut member (3) and the fastener (2) are made of stainless steel. The resin coating layer (4) is made of fluororesin.

More specifically, the nut member (3) has a truncated cone-shaped main body (31) having a tapered outer peripheral surface, and a truncated cone-shaped main body (31).
The outer peripheral surface of the truncated cone-shaped body (31) of the nut member (3) should be in sliding contact with the tapered hole (17). A concave portion (18) to be engaged with the convex portion (32) is formed on the truncated cone-shaped tapered surface. In the concrete structure, the protrusions (32) (32) of the nut member (3)
Engages with the concave portion (18) of the tapered hole (17) to prevent relative rotation of the nut member (3) with respect to the tapered hole (17). Here, the opening angle of the tapered surface of the nut member (3) is set to the tapered hole.
By setting the opening angle of the taper surface of (17) to be slightly larger than that, it is possible to more securely tighten the first case half body (11) and the second case half body (12) by the fastener (2). You can do it.

[0013]

According to the housing structure for outdoor installation according to the present invention, the fastening portion of the first case half body (11) and the second case half body (12) is electrochemically attached to the fastening part (2). There is no risk of corrosion.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION The PHS shown in FIG.
The embodiment implemented in the base station unit will be specifically described with reference to the drawings. In the base station unit according to the present invention, as shown in FIG. 4, a pair of case half bodies (11) (12) made of aluminum alloy are joined to each other to form a case (1) having liquid tightness, A plurality of electric parts are built in the case (1). Both case halves (11) (12) have a collar (1
3) (14) is projected, and both collars (13) (14) have multiple fasteners.
They are firmly fastened to each other by (2).

1 to 3 show a fastening structure of both case halves (11) and (12) by a fastener (2). As shown in FIG. 1, the flange portion (13) of the first case half body (11) is provided with a through hole (15) having a circular cross section, and the flange portion of the second case half body (12) is formed.
A conical trapezoidal tapered hole (17) is formed in the (14) coaxially with the through hole (15) and has a diameter reduced toward the through hole (15) side. A pair of recesses (18) (18) are formed on the surface.

Tapered hole in the collar portion (14) of the second case half body (12)
The nut member (3) shown in FIG. 3 is engaged with (17). The nut member (3) is made of stainless steel and has the tapered hole.
The outer peripheral surface of the truncated cone-shaped body (31) engageable with (17) is formed with a pair of protrusions (32) (32) engageable with the pair of recesses (18) (18). An inner screw (33) is formed in the central hole of the truncated cone body (31). Also, the collar (1) of the nut member (3)
A resin coating layer (4) is formed on the contact surface with 4) by baking and coating a fluororesin.

The nut member (3) is a fastener shown in FIG.
In the tightened state of (2), the upper surface of the convex part (32) (32) is the flange part (14).
Frustum-shaped body so that it does not touch the ceiling surface of the recesses (18) (18) of
The dimensions of (31) are designed. The opening angle of the truncated cone-shaped body (31) of the nut member (3) is set to be slightly larger than the opening angle of the tapered hole (17) of the second case half body (12).

The fastener (2) is made of stainless steel and has a head (22) and a screw shaft (21) as shown in FIGS.
The screw shaft (21) penetrates the through hole (15) of the first case half body (11), and the nut member (3) housed in the taper hole (17) of the second case half body (12). The first case half body (11) and the second case half body (12) are fastened to each other by being screwed into the inner screw (33).

In the fastening work, the second case half body (12)
With the nut member (3) housed in the tapered hole (17) of the above, the screw shaft (21) of the fastener (2) is screwed onto the inner screw (33) of the nut member (3), and the fastener (2) ) Tighten. by this,
A clamping force is generated between the fastener (2) and the nut member (3), and the clamping force causes the first case half body (11) and the second case half body (1).
2) and are pressed against each other. In this process, the nut member (3)
The convex portions (32) (32) of the flange portion (14) are received by the side walls of the concave portion (18) of the collar portion (14), and the rotation of the nut member (3) is prevented.

The outer peripheral surface of the truncated cone-shaped main body (31) of the nut member (3) is pressed against the inner peripheral surface of the taper hole (17) of the second case half body (12) so that the taper surfaces of the two taper surfaces are tapered. The wedge effect of the sliding contact increases the fastening force. Although the taper hole (17) of the collar portion (14) is slightly elastically deformed in the expanding direction as the fastener (2) is tightened, as described above, the truncated cone-shaped body (31) of the nut member (3). The opening angle of) is the taper hole (1
Since it is set slightly larger than the opening angle of 7),
In the completed tightening state, the truncated cone-shaped body of the nut member (3)
The outer peripheral surface of the (31) and the inner peripheral surface of the tapered hole (17) of the second case half body (12) are in close contact with each other, thereby ensuring reliable fastening.

In this manner, with the first case half body (11) and the second case half body (12) fastened to each other by tightening the fastener (2), the nut member (3 )
Outer peripheral surface and the taper hole of the aluminum alloy collar (14)
The resin coating layer (4) is interposed between the inner peripheral surface of (17) and the different metals do not come into direct contact with each other. Therefore, there is no possibility that electrochemical corrosion will occur due to the contact between different metals.

As described above, the base station unit according to the present invention has a case (1) made of an aluminum alloy and a fastener (2) made of stainless steel even if it is exposed to wind and rain outdoors for a long period of time. Since no electrochemical corrosion occurs in the contact area between them, the case (1) maintains high liquid tightness. Also fasteners
Since there is no risk of the (2) sticking to the case (1) due to corrosion, there is no problem in loosening the fastener (2) when inspecting the base station unit, and the case (1) can be easily disassembled.

The configuration of each part of the present invention is not limited to the above embodiment, and various modifications can be made within the technical scope described in the claims. Further, the present invention is not limited to the base station unit of PHS, and can be implemented in various electric equipment for outdoor installation.

[Brief description of drawings]

FIG. 1 is an exploded cross-sectional view of a fastening structure according to the present invention.

FIG. 2 is a sectional view of the fastening structure in an assembled state.

FIG. 3 is an exploded perspective view showing an engagement relationship between a taper hole of a collar portion and a nut member.

FIG. 4 is a perspective view of a base station unit.

FIG. 5 is a cross-sectional view showing a conventional fastening structure.

[Explanation of symbols]

(1) Case (11) First case half (12) Second case half (13) Tsuba (14) Tsuba (15) Through hole (17) Taper hole (18) Recess (2) Fastener (21) Screw shaft (22) Head (3) Nut member (31) frustoconical body (32) Convex part (33) Internal screw (4) Resin coating layer

Continued front page    F term (reference) 4D075 CA33 DA11 DA23 DA33 DB04                       DC19 EB16                 4E360 AB02 AB12 AB31 AB64 BC05                       BD03 EA12 ED02 ED17 ED27                       EE13 FA02 GA29 GA30 GB91                       GC03 GC04 GC16 GC17                 5K073 AA00 CC06 CC32 CC51 GG07

Claims (5)

[Claims] 1. A case (1) having liquid-tightness is formed by fastening flanges (13) (14) formed at a joint of a pair of metal case halves (11) (12) to each other. In an electric device for outdoor installation in which electric parts are built in the case (1), a through hole (1) formed in a collar portion (13) of the first case half body (11) is used.
5) is formed coaxially with the through hole (15) of the first case half body (11) in the flange portion (14) of the second case half body (12), and goes toward the through hole (15). A taper hole (17) having a taper surface that shrinks and a taper surface that is formed of the same material as the case (1) or a metal having an ionization tendency equivalent to that of the case (1) and should be slidably contacted with the taper surface of the taper hole (17). Inner screw that penetrates the outer peripheral surface and the central part
(33) and a nut member (3) engaged with the tapered hole (17) in a non-rotatable manner relative to the tapered hole (17), and at least the second case half (12) among the outer peripheral surface of the nut member (3). ) Of the resin coating layer (4) formed to cover the contact surface with the collar portion (14) and a material different from the case (1) or a metal having a different ionization tendency, and the head (22) and the screw With an axis (21),
Through hole (15) of first case half (11) and second case half (12)
Outdoors, characterized in that the screw shaft (21) is inserted into the taper hole (17) of the above, and the fastener (2) is screwed to the inner screw (33) of the nut member (3). Installation housing structure. 2. The outdoor installation casing structure according to claim 1, wherein the case (1) is made of an aluminum alloy, and the nut member (3) and the fastener (2) are made of stainless steel. 3. The housing structure for outdoor installation according to claim 1, wherein the resin coating layer (4) is made of a fluororesin. 4. The nut member (3) has a circular truncated cone-shaped main body (31) having an outer peripheral surface and one or a plurality of convex portions (32) protruding from the outer peripheral surface of the circular truncated cone main body (31). ) And taper holes (17)
The recessed portion (18) with which the convex portion (32) should be engaged is formed on the truncated conical tapered surface with which the outer peripheral surface of the truncated conical main body (31) of the nut member (3) should be in sliding contact. Claim 1 to Claim 3
The housing structure for outdoor installation according to any one of 1. 5. The outdoor installation casing structure according to claim 4, wherein the opening angle of the tapered surface of the nut member (3) is set to be slightly larger than the opening angle of the tapered surface of the tapered hole (17). .