JP2003069249A - Case assembly structure - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To securely mount a case body with a simple structure and prevent the case body from moving or falling off. SOLUTION: A pair of mounting legs 7 each composed of a leg piece 8 inclined inward and a locking part 9 which is bent outward and formed integrally at the tip thereof are opposed to and separated from each other. And the case body 2 erected integrally on the bottom surface, the first mounting hole 12 into which the leg piece 8 is fitted, and the second into which the locking portion 9 is fitted.
A pair of substantially L-shaped mounting holes 11 comprising the mounting holes 13 of FIG.
Mounting substrate 3 formed corresponding to each mounting leg 8,
And a base body 4 having a pair of locking projections 14 formed corresponding to the mounting holes 11. Second mounting hole 1
The leg pieces 8 crimped and folded by 3 are regulated, and the locking portions 9 orthogonal to the mounting board 3 are locked by the locking projections 14.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of mounting a case body by fitting an integrally formed mounting leg into a mounting hole formed in a mounting board and crimping the case. The present invention relates to an assembly structure of a case body assembled on a substrate. 2. Description of the Related Art In an electronic tuner device, for example, a circuit section such as a transmitting / receiving circuit section (not shown) is formed of a thin metal plate as shown in FIGS. 5 to 7 in order to prevent the influence of electromagnetic noise. It is stored in a box-shaped shield case 100. In the electronic tuner device, after the shield case 100 is mounted on a main surface of a mounting board 101 such as a wiring board or a mounting board, the mounting board 101 is
2 to be attached to the mounting portion. [0003] A pair of plate-like leg pieces 103 (103a, 103b) are integrally formed on the bottom surface of the shield case 100. Each leg piece 103 is erected at the center of both ends in the longitudinal direction of the bottom surface so as to face each other and is spaced apart from each other.
4b) is integrally protruded. Each caulking convex portion 104
Each leg piece 1 has a thickness substantially equal to or slightly smaller than the thickness of the mounting board 101 from the bottom surface of the shield case 100.
03 and is gradually inclined toward the tip. The mounting substrate 101 has a shield case 10
A pair of mounting holes 106 (106a, 106b) are formed in the mounting portion 105 on which the “0” is mounted, corresponding to the leg pieces 103. Each of the mounting holes 106 has a slit-like through hole having an opening width substantially equal to the thickness of the leg portion 103 and a length substantially equal to the length of the caulking convex portion 104. Although not shown, the mounting substrate 101 is provided with a plurality of mounting holes, and is mounted on the housing 102 by mounting screws screwed into these mounting holes. [0005] In the shield case 100, as shown in FIG. 6, each leg portion 103 is fitted into a corresponding mounting hole 106 and is combined with a mounting portion 105. In this state, each leg 103 has the crimped convex portion 104 penetrating through the bottom surface of the mounting board 101 in this state. Each of the caulking convex portions 104 is twisted from the mounting hole 106 to the bottom surface side of the mounting substrate 101 as shown by an arrow in FIG. 7 by performing a twisting process using an appropriate jig. Therefore, as shown by a chain line in FIG. 6, the shield case 100 is crimped so that the mounting substrate 101 is sandwiched between the bottom surface 100a and each of the caulking convex portions 104, and the shield case 100 is mounted on the mounting substrate 101. Can be The mounting board 101 is mounted on the housing 102 with the shield case 100 mounted. [0007] The shield case 100
As described above, the bottom surface 100a and the caulking convex portions 104
6, the fixing strength between the shield case 100 and the mounting substrate 101 is weak when the torsion angle of the caulking convex portion 104 is insufficient. In some cases, rattling occurred. Therefore, the present invention provides an assembling structure of a simple case body which can be firmly mounted even when a load is applied to a case body mounted by being caulked to a mounting board. It is intended to do so. According to the present invention, there is provided an assembly structure of a case body for achieving the above-mentioned object, comprising a case body, a mounting board on which the case body is mounted, a case body and a mounting board. And a base body to be assembled. The case body has at least mounting legs comprising a leg portion and a locking portion integrally formed by being bent outward and protruding laterally at a tip portion of the leg portion. It is integrally erected on the bottom surface so as to face and separate from each other. The mounting board includes a first mounting hole in which a leg piece is fitted and a second mounting hole in which a locking portion is fitted, corresponding to each mounting leg.
At least a pair of mounting holes having a letter shape are formed in a mounting portion for mounting the case body. The base body has at least a pair of locking projections integrally formed on the mounting portion of the mounting board so as to correspond to the second mounting hole. According to the assembly structure of the case body according to the present invention configured as described above, the case body has the first mounting holes of the mounting holes facing the leg portions of the mounting legs and the locking portions. By fitting into the hole and the second mounting hole and bending the leg piece, it is combined with the mounting board. In the assembling structure of the case body, the mounting protrusion is combined with the mounting hole by combining the mounting board with the base body. In the assembling structure of the case body, each of the locking portions, which become substantially upright on the bottom surface side of the mounting board by bending each of the mounting legs, is assembled by locking the inner surface thereof by each of the locking protrusions. . Therefore, in the case body assembling structure, each of the mounting legs which are relatively engaged with the mounting holes and crimped are held at the respective portions by the locking projections, so that even when a load is applied to the case body, Withdrawal of the mounting leg is reliably prevented, and the assembly is performed firmly without moving. Embodiments of the present invention shown in the drawings will be described below in detail. The electronic tuner device 1 shown as the embodiment is also similar to the above-described embodiment,
In order to prevent the influence of the electromagnetic wave noise, a circuit board and the like constituting a transmitting / receiving circuit unit, a control circuit unit, and the like (not shown) are housed in the shield case 2. In the electronic tuner device 1, the shield case 2 is connected to the mother wiring board 3, for example.
After being mounted together with other mounting parts and the like (not shown) on the main surface, an assembly of the shield case 2 and the mother wiring board 3 is assembled to a mounting portion formed on the base plate 4 of the housing. The shield case 2 comprises a case body 5 and a lid 6 each formed of a thin metal plate.
The case main body 5 has a horizontally long rectangular box shape with an open ceiling, and although not described in detail, a plurality of fitting recesses are formed on an opening edge, and an engagement projection is formed on an outer peripheral surface by stamping. Have been. The lid 6 is formed with an outer shape sufficient to close the ceiling of the case body 5, and an upright wall is formed integrally with the outer peripheral edge over the entire circumference. The lid 6 has a plurality of fitting projections formed integrally with the upright wall corresponding to the fitting recesses, and an engagement groove corresponding to the engagement projections. The shield case 2 is positioned and engaged with the case body 5 in which the circuit board is housed by the fitting of the fitting projection to the fitting recess. The projection is prevented from coming off by the relative engagement with the engagement groove, so that the ceiling is closed. The shield case 2 electromagnetically shields each circuit portion of the circuit board housed by the case body 5 and the lid 6. In the case main body 5, mounting legs 7 (7a, 7b) are integrally formed on both side edges in the longitudinal direction of the bottom surface 5a and located at substantially the center in the width direction. Each mounting leg 7
Are formed on the bottom surface 5a so as to face each other with the both side edges as base ends, and to form left-right symmetrical substantially L-shaped edging grooves. The L-shaped pieces left uncut by these edging grooves are formed at the base end. From the bottom so as to be orthogonal to the bottom surface 5a. Each mounting leg 7 includes a substantially vertical leg portion 8 (8a, 8b) and a locking portion 9 integrally formed at the tip of the leg portion 8. Each leg piece 8 has a strip shape having a width d, and is bent so as to be gradually inclined inward from the base end as shown in FIG. Each leg piece 8
As will be described later in detail, it functions as a caulking part for the mother wiring board 3 and also serves as a movement restriction part in the width direction of the shield case 2. Each locking part 9 (9
a, 9b) are composed of wide portions having a width e protruding from one side edge of each leg piece 8 as shown in FIG. Each locking portion 9 is formed to be bent outward at a bending angle of approximately 90 ° with respect to each leg piece portion 8. Each locking part 9 also
As will be described later in detail, it serves as a portion for caulking the mother wiring board 3 and also serves as a portion for restricting movement of the shield case 2 in the longitudinal direction. The mother wiring board 3 has a pair of mounting holes 11 which are opposed to and separated from each other in the longitudinal direction corresponding to the mounting legs 7 in the mounting portion 10 on which the shield case 2 is mounted.
(11a, 11b) are formed. Each mounting hole 11
Are the first mounting holes 12 (12a, 12b), respectively.
And the second mounting holes 13 (13a, 13b), which are connected to one end of the first mounting holes 12 in an orthogonal state, and have a substantially L-shape facing each other. Each of the first mounting holes 12 has an opening width larger than the thickness of the leg piece 8 of each mounting leg 7, and is formed of slit-shaped opening grooves parallel to each other. Each of the first mounting holes 12 has an opening length substantially equal to the length e of the locking portion 9 of each mounting leg 7. The second mounting holes 13 each have an opening width substantially equal to the width d of the leg portion 8 and have a length slightly larger than the thickness of the leg portion 8. Although not shown, a stud having a plurality of mounting holes is integrally formed on the main surface 4a of the base plate 4, and is mounted on the studs by mounting screws screwed into these mounting holes from the bottom side. Mother wiring board 3
Is positioned and fixed. A pair of locking projections 14 (14a, 14b) are integrally formed on the main surface 4a of the base plate 4 corresponding to the mounting holes 11 of the mother wiring board 3. As shown in FIG. 1, each of the locking projections 14 is formed so as to be located slightly inside the first mounting hole 12 of each of the mounting holes 11, and has a rectangular shape larger than each of the mounting holes 11. Consists of convex portions. When the mother wiring board 3 is fixed on the base plate 4, each of the locking projections 14
It has an outer shape sufficient to close a part of the first mounting hole 12 and almost the entire second mounting hole 13. As shown in FIGS. 2 and 3, each locking projection 14 has an outer side surface 15 (15a, 15b) with a thickness of the leg piece 8 with respect to the outer wall of the first mounting hole 12. It is located at a slightly larger interval than. Further, each of the locking projections 14 has an inner side surface 16 (16a) with respect to the locking portion 9 orthogonal to the bottom surface side of the mother wiring board 3 by crimping and folding the leg pieces 8 as described later. , 16b) are in contact with each other. The upper surface of each locking projection 14 contacts the bottom surface of the mother wiring board 3 at the position of the mounting hole 11, and the mounting hole 11 is closed from the back side of the mother wiring board 3. In the electronic tuner device 1 configured as described above, the shield case 2 containing the circuit board and the like is mounted on the mother wiring board 3 as in the conventional electronic tuner device. It is positioned and fixed on the base plate 4. In the electronic tuner device 1, as shown in FIG. 2, the leg piece 8 of the mounting leg 7 is bent along the bottom surface of the mother wiring board 3 at the tip end penetrating the mounting hole 11, and the case The shield case 2 is mounted on the mother wiring board 3 while sandwiching the mother wiring board 3 between the bottom surface 5a of the base member 5 and the bent leg piece 8. A method of attaching the shield case 2 to the mother wiring board 3 will be described with reference to FIG. Each mounting leg 7 of the shield case 2 is fitted into the mounting hole 11 from above the mother wiring board 3 as shown by an arrow in FIG. When the mounting leg 7 is fitted in the mounting hole 11, the locking portion 9 is positioned corresponding to the first mounting hole 12, and the leg piece 8 is positioned corresponding to the second mounting hole 13. I have. The shield case 2 has the mounting legs 7 formed in the mounting holes 1.
In the state of fitting into the inside 1, the distal ends of the leg pieces 8 are bent inward as indicated by arrows in FIG. A part of the leg piece 8 fits into the second mounting hole 13 as it is bent. Shield case 2
In this state, as shown in the drawing, the locking portion 9 is orthogonal to the bottom surface of the mother wiring board 3. As described above, the shield case 2 has the leg pieces 8 formed by the mother wiring board 3 and the bottom surface of the case body 5.
By holding the mounting portion 10 of the mother wiring board 3.
Is held. The mounting state of the shield case 2 is maintained by the crimped mounting legs 7 being prevented from being removed from the mounting holes 11 by the mother wiring board 3. The shield case 2 is prevented from moving in the width direction by the leg pieces 8 being restricted in the width direction in the second mounting holes 13. When the motherboard 3 is fixed to the base plate 4, the mounting holes 11 of the shield case 2 are secured from the bottom side of the motherboard 3 to the base plate 4 as shown in FIGS. The upper surface of the locking projection 14 comes into contact with and is closed. Therefore, in the shield case 2, the mounting leg 7 is in a state of being removed from the mounting hole 11. Since the width d of the leg piece 8 is formed substantially equal to the groove width of the second mounting hole 13 as described above, the shield case 2 has a groove formed in the second mounting hole 13. The position is regulated in the width direction by the wall. In addition, the shield case 2 includes a pair of locking portions 9 separated in the longitudinal direction.
inner surface 1 of locking projection 14a, 14b with which a, 9b faces
By abutting on 5a and 15b, the position is regulated in the longitudinal direction. Therefore, even when a large external force is applied to the shield case 2, the mounting leg 7 is reliably prevented from being pulled out or moved from the mounting hole 11 and is firmly mounted on the mother wiring board 3. In the electronic tuner device 1 shown in the above-described embodiment, a pair of left and right mounting legs 7 are formed on the case main body 5 of the shield case 2 and a mother wiring board corresponding to the mounting legs 7 is provided. 3, a pair of left and right mounting holes 11 and a pair of left and right locking projections 14 are formed in the base plate 4, but it is a matter of course that the present invention is not limited to such a structure. When the shield case 2 is relatively large or heavy, the electronic tuner device 1 forms a plurality of mounting legs 7 on the left and right sides of the case main body 5 and also includes the mother wiring board 3 and the base plate 4. May be formed with a plurality of mounting holes 11 and locking projections 14, respectively. Further, the present invention is not limited to the electronic tuner device 1 and the shield case body 2, but it is needless to say that the present invention is applied to a case body mounting structure in various electronic devices and the like. As described in detail above, according to the case assembling structure of the present invention, each leg is bent by fitting each leg into the corresponding mounting hole and then bending each leg. In the case where a load is applied to the case body, since the one side portion is restricted by the second mounting hole portion and the locking portion that is orthogonal to the mounting board is restricted by the locking convex portion. In this case, the extraction of each mounting leg is reliably prevented, and the assembling is performed firmly without moving.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view of a main part of an electronic tuner device shown as an embodiment of the present invention. FIG. 2 is a longitudinal sectional view of a main part of the electronic tuner device. FIG. 3 is a plan view of a main portion of the electronic tuner device with a part cut away. FIG. 4 is an explanatory diagram of a step of attaching a shield case in the electronic tuner device. FIG. 5 is an exploded perspective view of a main part of a conventional electronic tuner device. FIG. 6 is a longitudinal sectional view of a main part of the electronic tuner device. FIG. 7 is a plan view of a main portion of the electronic tuner device with a part cut away. [Description of Signs] 1 Electronic tuner device 2 Shield case 3 Mother wiring board 4 Base board 5 Case main body 6 Cover 7 Mounting leg 8 Leg piece 9 Locking section 10 Mounting section 11 Mounting hole 12 First mounting hole section 13 Second mounting hole 14 Locking projection 15 Outer side 16 Inner side

Claims (1)

Claims: 1. A leg portion, and a locking portion integrally formed by being bent outward at a tip portion of the leg portion and protruding laterally. A case body in which at least the mounting legs are opposed to and separated from each other and are integrally erected, a first mounting hole in which the leg pieces are fitted, and a second mounting in which the locking portion is fitted A mounting board having at least a pair of mounting holes each having a substantially L-shape formed of a hole and being formed in a mounting portion of the case body corresponding to each of the mounting legs; A base body formed by integrally projecting at least a pair of locking projections corresponding to the holes, wherein the case body faces the leg piece of each of the mounting legs and the locking portion. After fitting the first mounting hole and the second mounting hole of the mounting hole and bending the leg piece, the mounting substrate is The mounting holes and the locking projections are combined by being combined with each other, and each of the locking portions, which is substantially upright on the bottom side of the mounting board, is formed by each of the locking projections. A case assembling structure characterized in that the sides are locked and assembled.