JP3275943B2 - Plug-in type instrument mounting structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plug-in type instrument mounting structure, and more particularly to an improvement in a plug-in type instrument mounting type mounted on a control panel.

[0002]

2. Description of the Related Art As shown in FIG. 8, for example, a plug-in type instrument 1 of this kind has an internal unit 11 in which a circuit board 9 is supported on the back side of a front cover member 7 having a display unit 3 and an operation unit 5. And the circuit board 9 is attached to the front opening 1 of the instrument case 13.
5 to close the front opening 15 with the front cover member 7 and a flange 19 formed on the outer periphery of the instrument case 13.
The inner unit 11 is detachably fixed to the instrument case 13, and the external connection terminal 17 arranged at the bottom on the back side of the instrument case 13 extends to the inside of the instrument case 13, and the circuit board 9 is connected thereto. A known configuration is known. In the drawings of the present application, the plug-in type instrument 1 is simply referred to as an instrument, and the back side of the instrument case 13 is simplified for convenience except in FIG.

[0005] The plug-in type instrument 1 is shown in FIG.
As shown in (1), the flange 19 of the instrument case 13 is inserted into the mounting hole 23 of the control panel 21 from the front side, the flange 19 of the instrument case 13 is locked to the panel 21, and the fastening fitting 25 is pressed from the back side of the panel 21. As a result, the panel 21 is fixed to the flange 19 so as to be sandwiched between the flange 19 and the fastening fitting 25. That is, on the outer periphery of the instrument case 13, a long and thin fastening member 25 is housed in a concave groove 13 a extending in the front-rear direction. Raising part 25
The screw 27 is inserted through the contact b toward the contact piece 25a.

The screw 27 is screwed into a support fitting 29 fixed to the instrument case 13 so as to straddle the fastening fitting 25. When the screw 27 is tightened, the contact piece 25 a of the fastening fitting 25 is attached to the back surface of the panel 21. The instrument case 13 is fixed to the panel 21 by pressing against the side. These tightening fittings 25, support fittings 29, and screws 27 are arranged in a pair on the outer periphery of the instrument case 13 at diagonal positions when viewed from the front cover member 7, but in FIG. Although they appear below, they are not shown for convenience.

[0005]

However, since the plug-in type instrument 1 described above is configured so that the inner unit 11 can be freely attached to and detached from the instrument case 13, the inner unit 11
After the terminal is pulled out, a portion of the terminal extending from the external connection terminal 17 may be exposed inside the instrument case 13, and improvement may be required in terms of safety standards. However, in the above-described plug-in type instrument mounting structure, if the configuration of the conventional instrument case 13 or the internal unit 11 is changed to provide an internal unit removal preventing mechanism, the cost of the product is likely to increase. It has been desired to provide a configuration that prevents removal of the inner unit 11 without changing the shapes of the instrument case 13 and the inner unit 11.

SUMMARY OF THE INVENTION The present invention has been made under such circumstances, and a plug-in type instrument mounting that makes it difficult to remove the internal unit without changing the configuration of the instrument case or the internal unit or by making a slight change. Provides structure.

[0007]

SUMMARY OF THE INVENTION In order to solve such a problem, the present invention provides a panel having a mounting hole and a flange which is inserted from the front side of the panel and formed on the outer periphery of the panel. An instrument case fixed to the instrument case with the panel interposed, and an inner instrument inserted into the instrument case from the back side of the front lid member and closed so that the front cover member is overlaid on the front opening of the instrument case and fixed thereto The instrument case is provided between the flange or the front cover member and the panel, and protrudes toward the front side of the panel. In addition, the present invention includes a pair of frame members that are divided into two as the above-mentioned surrounding frame, and a structure in which the engaging portions provided on these frame members are engaged with each other to be integrated, or one portion is separated. A configuration is also possible that is formed so as to be able to expand together with the separation portion and is integrated with the separation portion.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view showing one embodiment of a plug-in type instrument mounting structure according to the present invention. Note that the same reference numerals are given to parts common to the conventional example. In FIG. 1, an instrument case 13 formed in a box shape has a conventionally known configuration, and is formed of a synthetic resin or a metal material.
That is, the instrument case 13 corresponds to the above-described FIGS.
As shown in FIG. 5, one end face side is a front opening portion 15 and a flange 19 is integrally provided on the outer periphery, and an external connection terminal 17 (not shown) is arranged at a bottom portion on the back side. I have.

On the outer periphery of the instrument case 13, a concave groove 13a extending in the front-rear direction is formed on the back side of the flange 19, and an elongated fastening fitting 25 whose both ends are raised and bent is accommodated therein. One rising portion of the fastening member 25 is a contact piece 25a with the back side of the metal panel 21, and a screw 27 is inserted through the other rising portion 25b toward the contact piece 25a. The fastening member 25 itself is slidable in the front and rear direction in the concave groove 13a.

At a position slightly closer to the contact piece 25a from the rising portion 25b of the fastening member 25, the fastening member 25 is located.
A support bracket 29 is detachably fixed to the instrument case 13 so as to straddle the bracket, and a screw 27 is penetrated so as to be screwed into the support bracket 29. However, the fastening fitting 25, the support fitting 29, and the screw 27 are arranged in the instrument case 13 after being inserted into the mounting hole 23 of the panel 21.

The inner unit 11 has a display unit 3 and an operation unit 5 (both not shown in FIG. 1) and a flange 19.
The circuit board 9 is formed on the back side of the front cover member 7 having substantially the same outer dimensions as the outer periphery of the instrument case 13 (see FIG. 8). The circuit board 9 is inserted from the front opening 15 of the instrument case 13. The front opening part 15 is closed by the front cover member 7 and overlapped on the flange 19, and is detachably fixed to the instrument case 13. Although not shown, the inner unit 11 is releasably locked and fixed to a locking portion protruding from the front opening 15 of the instrument case 13, or is fixed to the locking portion protruded from the inner case 11. It is general that the front opening 15 is releasably locked and detachably fixed.

The flange 19 of the instrument case 13 and the outer periphery of the inner unit 11 are covered with an enclosing frame 31 so as to abut, and the insertion side 31a of the enclosing frame 31 is inserted between the flange 19 and the panel 21 to be tightened. The panel 21 and the insertion side 31a are sandwiched between the contact piece 25a and the flange 19 by the pressure contact with the panel 21 by the pressure. The inside of the surrounding frame 31 has substantially the same shape as the outer peripheral shape of the flange 19 of the instrument case 13 and the front cover member 7 of the inner unit 11.
For example, as shown in FIG.
And a frame shape that is at least substantially the same as or slightly thicker than the thickness of the front cover member 7, and the insertion side 31a is integrally extended from four sides toward the inside on one end side, and the inside is narrow. It has become. However, the insertion side 31 a of the surrounding frame 31 has a projecting dimension such that the surrounding frame 31 fits on the outer periphery of the instrument case 13.

Next, the procedure for assembling the above-described plug-in type instrument mounting structure of the present invention will be described. First, the inner unit 11
The instrument frame 13 is fitted into the mounting hole 23 from the front side of the panel 21 by inserting the surrounding frame 31 from the back side of the instrument case 13 in which is fixed.
9. When the screw 27 is arranged, and the screw 27 is tightened and rotated to slide the fastener 25 toward the panel 21, the contact piece 25a of the fastener 25 strikes the panel 21 to displace the instrument case 13 rearward. The insertion side 31a of the panel 21 and the surrounding frame 31 between the contact piece 25a and the flange 19
Is pinched.

In this state, the instrument case 13 is
1, while the surrounding frame 31 is also supported.
Since the flange 19 of the instrument case 13 and the entire outer periphery of the front cover member 7 of the inner unit 11 are covered so as to abut on the surrounding frame 31, the front cover member 7 cannot be pinched and the inner unit 11 is extremely difficult to be removed from the instrument case 13. Become. Therefore, the enclosing frame 31 in the present invention is formed to have an inner size and a shape such that a finger or a jig cannot be inserted between the enclosing frame 31 and the front lid member 7, and to be formed with a thickness that is not significantly deformed by synthetic resin or metal. Is preferred.

Then, the instrument case 13 and the surrounding frame 31 can be removed from the panel 21 by loosening and rotating the screw 27 and sliding the fastening fitting 25 backward. As described above, the mounting structure of the plug-in type instrument according to the present invention includes the surrounding frame 31 supporting the insertion side 31 a between the flange 19 of the instrument case 13 and the panel 21 on the front side of the panel 21.
Since the entire outer periphery of the front cover member 7 of the inner unit 11 together with the flange 19 of the instrument case 13 is covered so as to be substantially in close contact with the entire outer periphery, the front cover member 7 can no longer be pinched and the inner unit 11 can be attached to the instrument case. 13 makes it extremely difficult to remove.

Moreover, there is no need to change the shapes of the panel 21, the instrument case 13, and the inner unit 11, and the like. It can be handled with a slight increase in cost. In the configuration shown in FIG. 1 described above, an example is shown in which the integrally formed surrounding frame 31 is used, but the present invention is not limited to this.

For example, as shown in FIG. 3, a pair of U-shaped frame members 33a, 33 divided into two parts from the middle of two opposing sides.
It is also possible to use a surrounding frame 33 formed by connecting b to form a square. The surrounding frame 33 shown in FIG. 3 is formed by forming engaging projections 33c which engage with each other at a connecting portion of the frame members 33a and 33b, and forming a U-shaped engaging recess 33d on the engaging projections 33c. Are the engaging projections, and the engaging recesses 33d and the engaging projections 3
3e are engaged with each other so as to fit each other.
3a and 33b are connected. Reference numeral 33f in FIG. 3 denotes an insertion side.

As shown in FIG. 4, the surrounding frame 33 loosens the screw 27 with respect to the instrument case 13 previously attached to the panel 21, rotates the tightening fitting 25 backward, and slides the panel 21 and the instrument. A gap is formed between the flanges 19 of the case 13, the insertion sides 33 f of the frame members 33 a, 33 b are inserted into the gap from above and below or right and left with respect to the instrument case 13, connected to each other to form the surrounding frame 31, and again. When the screw 27 is tightened and rotated, the panel 21 and the surrounding frame 33 are sandwiched between the contact piece 25 a and the flange 19. Moreover, the engagement recesses 33 of the frame members 33a, 33b
d and the engaging projection 33e are engaged with each other so as to be engaged with each other to form the surrounding frame 33. Since the frame members 33a and 33b are supported in a state where they are mechanically strongly connected, the instrument case 1
It is difficult for the surrounding frame 33 to come off from 3.

As described above, the frame members 33a, 3
In the configuration using the surrounding frame 33 made of 3b, in the mounting structure of the conventional plug-in type instrument already assembled,
Just loosen the screw 27, the instrument case 13
There is an advantage that the entire outer periphery of the flange 19 and the front cover member 7 of the inner unit 11 can be covered with the surrounding frame 33 without removing the flange 19, and the applicable range of the present invention is expanded. Further, as shown in FIG. 5, the surrounding frame formed by the two divided frame members
Both ends 35c, 35d, 35e, 35f of the frame members 35a, 35b divided into two in an L-shape at the corners of the places are formed thinly,
The present invention is also applicable to a case where the end portions 35c and 35e and the end portions 35d and 35f are overlapped with each other to form a rectangular enclosing frame 35.

The reference numeral 35g in FIG.
a and 35b are screw holes provided in the frame member 35h.
A screw 35i to be inserted into the screw hole 35g for fixing a and 35b, reference numeral 35i is an insertion side. Further, as shown in FIG. 6, for example, in addition to the enclosing frame composed of the two divided frame members, one portion of a rectangular enclosing frame 37 is cut and separated, and one side of the enclosing frame 37 is cut off.
7a is connected to the surrounding frame main body 37b by a hinge mechanism.
A configuration in which 7a is fixed to the surrounding frame main body 37b with screws 37c is also possible. Note that reference numeral 37d in FIG. 6 denotes an insertion side.

As described above, the surrounding frames 35 and 37 shown in FIGS. 5 and 6 can be used similarly to the surrounding frame 33 shown in FIG. In the present invention described above, the surrounding frames 33 to 3
7, the insertion sides 33f, 35i, and 37d are sandwiched between the flange 19 and the panel 21, but the front cover member 7 of the inner unit 11 is separated from the flange 19 of the instrument case 13 as shown in FIG. Is also large, the enclosing frames 33-3
The object of the present invention is achieved by inserting and supporting the insertion sides 33f, 35i, and 37d between the front cover member 7 of the inner unit 11 and the panel 21.

As described above, according to the present invention, the flange 19 of the instrument case 13 or the front cover member 7 of the inner unit 11 and the panel 21
The inner frames of the enclosing frames 33 to 37 and the outer peripheral surfaces of the instrument case 13 and the inner unit 11 projecting to the front side (operation surface side) of the panel 21 are inserted between the inner frames 33 to 37. What is necessary is just to enclose with the surrounding frames 33-3 so that it may contact. Most gaps are acceptable. By the way, in the configuration of the present invention described above, the fastening fitting 25, the support fitting 29, and the screw 27 are arranged on the instrument case 13, and the panel 21 is pressed from the rear side to fix the instrument case 13 to the panel 21. However, the present invention can be embodied in a configuration in which the instrument case 13 is fixed to be sandwiched between the panels 21 by another known configuration.

[0023]

As described above, according to the present invention, in a plug-in type instrument to be mounted on a panel, a surrounding frame is inserted and supported between the panel and the flange of the instrument case or the front cover member of the inner unit. Since the front cover member of the inner unit and the entire outer periphery of the instrument case are covered with the surrounding frame, the front cover member cannot be pinched and the inner unit is extremely difficult to be removed from the instrument case. In addition, since there is no need to change the panel, the instrument case, and the inner unit, and only by adding an enclosing frame having a simple structure, it is possible to cope with a slight increase in cost. Even if it is necessary to make a change to the system, it can be dealt with with only a slight change, so that the cost is not increased much. Therefore, it becomes difficult to remove the inner unit by a person other than a specialist, and after removing the inner unit, it is possible to prevent accidental contact with the terminal in the instrument case.
Safety is ensured. Furthermore, when the internal instruments of various function types can be inserted into the same instrument case as in the case of a so-called series product, erroneous mounting of the internal instruments by a person other than a specialist can be prevented. In addition, in the configuration using the enclosing frame composed of the pair of frame members divided into two or the enclosing frame formed so as to be separated and expandable at one place, in addition to the above-described effects, the instrument case already attached to the panel is provided. Since the surrounding frame can be arranged without removing the frame, the mounting efficiency of the surrounding frame is good.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view (partially shown in side view) showing one embodiment of a plug-in type instrument mounting structure according to the present invention.

FIG. 2 is a perspective view showing an example of an enclosure used for the mounting structure of FIG.

FIG. 3 is a perspective view showing another example of the surrounding frame in the present invention.

FIG. 4 is a cross-sectional view (partially shown in side view) for explaining a procedure for mounting the enclosure shown in FIG. 3 in the plug-in type instrument mounting structure of the present invention.

FIG. 5 is a perspective view showing another example of the surrounding frame in the present invention.

FIG. 6 is a perspective view showing another example of the surrounding frame in the present invention.

FIG. 7 is a schematic sectional view showing another embodiment of the plug-in type instrument mounting structure according to the present invention.

FIG. 8 is a perspective view showing a relationship between an instrument case and an inner unit in the plug-in type instrument.

FIG. 9 is a cross-sectional view (partially shown in side view) showing a mounting structure of a conventional plug-in type instrument.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Plug-in type | mold instrument (instrument) 3 Display part 5 Operation part 7 Front cover member 9 Circuit board 11 Inner device 13 Instrument case 13a Concave groove 15 Front open part 17 External connection terminal 19 Flange 21 Panel 23 Mounting hole 25 Tightening fitting 25a This Contact piece (rising part) 25b Standing part 27, 35h, 37c Screw 29 Support bracket 31, 33, 35, 37 Enclosure frame 31a, 33f, 35i, 37d Insertion side 33a, 33b, 35a, 35b Frame member 33c Engagement Projection piece 33d Engagement concave part 33e Engagement convex part 35c, 35d, 35e, 35f End part 35g Screw hole 37a One side 37b Surrounding frame main body

Claims (3)

(57) [Claims] 1. A panel having a mounting hole, an instrument case inserted from the front side of the panel and locking a flange formed on an outer periphery to the panel, and fixed to the panel with the panel interposed therebetween; Inserted into the instrument case from the back side of the member,
An inner unit closed and fixed to the front cover member so as to overlap the front open portion of the instrument case, and inserted and supported between the flange or the front cover member and the panel; And a surrounding frame that surrounds the outer periphery of the side of the instrument case and the inner case that protrudes. 2. The plug-in type instrument according to claim 1, wherein the surrounding frame is formed of a pair of frame members divided into two, and is integrated by engaging engagement portions provided on these frame members. Mounting structure. 3. The plug-in type instrument mounting structure according to claim 1, wherein said enclosing frame is formed so as to be separated at one place and expandable, and is integrated by engaging said separating portion.