JPH0227590Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a housing structure of an electronic device such as a programmable controller.

[Conventional technology]

For example, a programmable controller typically has a base made of a metal plate, and a large number of electrical (children)
one or more printed circuit boards with components;
A device with a power supply, display, terminal block, etc. attached and covered with a synthetic resin case is used.

[Problem that the invention attempts to solve]

In such programmable controllers, the printed circuit board must be installed separated from the base by a predetermined distance, and the I/O terminal block must be installed on the side edge of the housing, making positioning and installation troublesome. In particular, the entire case is made of relatively thin synthetic resin, so
There was a problem in that heat deformation occurred due to heat generated by internal electronic elements and electrical components, causing the side plate to separate from the base.

[Means for solving problems]

The present invention was made to solve the above problems, and consists of a support that has a groove and a through hole in the center for holding a printed circuit board on which a desired electronic circuit is wired, and a support that is erected on the side edge. a support member made of a support piece, etc., and a case having a fitting part on the inside of a side plate into which a support piece provided on the support member is fitted; The printed circuit board, the support member, and the base are integrated by fitting the grooves of the case and attaching it to the base, and screwing the screws into the through holes of the support from the back side of the base, and also attaching the fitting part of the case to the support. The present invention provides a casing for an electronic device configured to fit into a support piece of a member.

[Effect]

Fit the printed circuit board into the groove provided in the pillar of the support member, and screw the screw into the pillar from the back of the base.
The base, printed circuit board, and support member are integrated, and a fitting portion provided on the case is fitted into a support piece of the support member.

〔Example〕

Fig. 1 is a front view of the embodiment of the present invention, partially shown in cross section, and Fig. 2 is A of Fig. 1, partially omitted.
-A sectional view. In both figures, 1 is a base made of a metal plate, 2 is a support member made of synthetic resin, 3 is a printed circuit board, 4 is a terminal block, 5 is a case, and 2 is a support member made of synthetic resin.
Although a portion is omitted in the figure, the casing of the present invention is symmetrically constructed with a predetermined distance apart from the top of the figure, and is approximately rectangular in plan view.

As shown in FIG. 3, the base 1 is constructed by bending both long edges of a substantially rectangular metal plate upward and forming side walls 11,1.
1a, and mounting portions 12 to 12c for attaching to a panel or the like are formed on both sides of the short sides, respectively. In addition, 13-13c and 14-14c are through holes,
Each has a countersink hole formed on the back.

As shown in FIG. 4, a plurality of supporting members 2 (three in the figure) project slightly outward from the front side edge 21.
Support pieces 23 to 23b (shown individually) stand upright and are reinforced by ribs 24 to 24b. 25, 25a are pillars erected on both sides, and through holes 26, 26a are provided in the center.
Also, on the back side, there is a groove 2 whose bottom surface is at the same height as the flat part 22.
7, 27a are provided. 28 and 28a are protrusions provided on the flat portion 22 for positioning the printed circuit board 3. In the present invention, two supporting members 2 having the same structure are used.

As shown in FIG. 5, the printed circuit board 3 is formed into a substantially rectangular shape, and has convex projections on both long sides thereof at positions corresponding to the support pieces 23 to 23b and the ribs 24 to 24b of the support member 2, respectively. Notches 31 to 31b are provided, and rectangular notches 32 and 32a are provided at positions corresponding to the pillars 25 and 25a of the support pieces 23 to 23b, respectively. 33,
33a is a through hole provided close to the cutout portions 32, 32a, and 34, 34a are protrusions 28, 2 of the support member 2.
A positioning hole provided at a position aligned with 8a, 3
5 and 35a are holes that align with the screw holes of the mounting part of the terminal block 4, which will be described later, and 36 to 36n are holes through which the fixed legs of each terminal provided on the terminal block 4 are inserted (the middle part is omitted). .

As shown in FIG. 1, the terminal block 4 has mounting legs 41, 41a with screw holes on both sides of the lower surface, and a large number of terminals 42 to 42n (the middle part is omitted) on the upper surface.
are provided, and fixed legs 43 to 42 of each terminal 42 to 42n are provided.
43n are respectively inserted into the holes 36 to 36n of the printed circuit board 3 and soldered.

As shown in FIG. 6, the case 5 is made of synthetic resin and is molded into a convex shape, and the top plate 51 has a display window 5.
2. Windows 53 and the like are provided for connecting the connectors, and windows 54 and 54a from which the terminals 42 to 42n of the terminal block 4 project are formed on both shoulders of the long sides. 56 to 56b are long side plates 5
5, 55a, the support pieces 23 to 2 of the support member 2
A fitting part such as a groove is provided at a position corresponding to 23b, 57 to 57c are mounting parts to the base 1 having screw holes, and 58 to 58c are mounting parts to a panel or the like. Note that 59 is a ventilation hole provided in the side plate.

Next, an example of the assembly order of the casing consisting of the above-mentioned parts will be explained.

(1) Terminal blocks 4 are installed on both sides of the top surface of the long side of the printed circuit board 3.
The mounting legs 41, 41a are brought into contact with the through holes 35, 35a, respectively, and fixed with screws from the back side, and the fixing legs 43 of each terminal 42 to 42n are
~43n respectively to hole 36~ of printed circuit board 3
36n and solder it.

(2) Notches 32, 3 provided on both sides of the printed circuit board 3
2a into the grooves 27, 27a provided in the pillar 2 of the support member 2, respectively, and the positioning holes 34, 34a are fitted into the protrusions 28, 28 of the support member 2.
Fits into a. As a result, the printed circuit board 3 is correctly positioned on the support members 2, 2 on both sides,
Each of the notches 31 to 31b of the printed circuit board 3 faces the support pieces 23, 23a of the support member 2, and the holes 33, 33a of the printed circuit board 3 are aligned with the holes 26, 26a of the support member 2 and the columns 25, 25a. .

(3) The printed circuit board 3 with supporting members 2, 2 attached on both sides is fitted between the side walls 11, 11a of the base 1. At this time, the support column 2 of the support member 2
The holes 26, 26a of the base 1 are aligned with the holes 13, 13a of the base 1.

(4) From the back of the base 1 to the support column 25 of the support member 2,
The screws 29 are inserted into the holes 26, 26a of the printed circuit board 3 through the holes 33, 33a of the printed circuit board 3, and tightened. As a result, the support member 2 is fixed to the base 1, and the grooves 2 of the columns 25, 25a
7 and 27a are narrowed and clamp the printed circuit board 3, so that the printed circuit board 3 is firmly fixed.

(5) Finally, cover the case 5 from above, and
Fitting parts 56 to 56b provided inside 5, 55a
are fitted into the support pieces 23 to 23b of the support member 2, respectively, and inserted into the through holes 14 to 14 from the back side of the base 1.
Screws are inserted into the mounting parts 57 to 57c of the case 5 through the screws 57c to fix them together.

In the above description, the case where one printed circuit board 3 is attached has been explained, but it goes without saying that two or more printed circuit boards may be attached, and a power supply, a display section, etc. may also be attached. In addition, through holes 26, 26a are provided in the columns 25, 25a of the support member 2.
Although the case where the screw 29 is screwed into this through hole is shown, a female screw may be inserted into this hole and integrally molded. Note that the shapes, dimensions, etc. of the support member, case, etc. are not limited to the above embodiments, and can be changed as appropriate without departing from the gist of the present invention.

[Effect of idea]

The present invention fits a printed circuit board to a support member,
The printed circuit board is easily positioned and fixed because it has a column with a groove for positioning and clamping and a plurality of support pieces, and also has a fitting part on the case that fits into the support piece of the support member. In addition, it is possible to prevent the lower edge of the case from separating from the base due to thermal deformation. Furthermore, as shown in the example, if a positioning protrusion is provided on the flat part of the support member, the positioning of the printed circuit board can be further improved. It is highly effective in practical use, as it makes it easier to use.

[Brief explanation of the drawing]

Fig. 1 is a front view of the embodiment of the present invention, Fig. 2 is a sectional view taken along the line A-A with some parts omitted, Fig. 3 a is a plan view of the embodiment of the base, and b is a side view thereof. Fourth
Figure a is a front view of an embodiment of the support member, b is a plan view,
c is a rear view, d is an enlarged sectional view taken along B-B in figure B, e is an enlarged sectional view taken along C-C in figure B, Fig. 5 is a plan view of an embodiment of the printed circuit board, and Fig. 6 a is an implementation of the case. The bottom view of the example, b is the DD sectional view of figure a, and c is E of figure a.
-E sectional view. 1: base, 11, 11a: side wall, 2: support member, 23-23b: support piece, 25, 25a: support column, 26, 26a: through hole, 27, 27a: groove,
28, 28a: protrusion, 3: printed circuit board, 31~
31b, 32, 32a: Notch, 34, 34a: Positioning hole, 35, 35a: Hole, 4: Terminal block,
41, 41a: Mounting leg, 42 to 42n: Terminal,
5: Case, 54, 54a: Terminal protrusion window, 56
~56b: Fitting portion.

Claims (1)

[Claims for Utility Model Registration] (1) A post having a groove for holding a printed circuit board on which a desired electronic circuit is wired and a through hole in the center;
A support member consisting of a support piece or the like installed upright on a side edge, and a case provided with a fitting part on the inside of the side plate into which the support piece provided on the support member is fitted, and on both sides of the printed circuit board. The supporting member is attached to the base by fitting into the groove provided in the pillar, and a screw is inserted into the through hole of the pillar from the back side of the base to integrate the printed circuit board, the supporting member, and the base, and the case is fitted. A casing structure for an electronic device, wherein a mating portion is configured to fit into a support piece of the support member. (2) The electronic device casing according to claim 1, which is a utility model registered claim, wherein a protrusion is provided between the support pieces of the support member, and a positioning hole that fits with the protrusion is provided in the printed circuit board. structure. (3) The housing structure for an electronic device according to claim 1, wherein a female thread is provided in the center of the support column of the support member.