JP2875979B2 - Panel instrument - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a panel instrument having a structure in which a front cover can be detached from a case and attached to a panel, and more particularly to a panel instrument which does not require packing and can reliably perform waterproofing and dustproofing. is there.

[0002]

2. Description of the Related Art A panel instrument has a structure in which a front cover, on which a switch and a display unit are incorporated, is attached from the front into a cylindrical opening or the like having a front opening, and a cover is provided. is there. Such panel instruments are generally mounted on control panels, etc., but there is a risk of water adhering to these panels during use or during cleaning.Therefore, packing is provided between the case opening and the front cover. To achieve a waterproof and dustproof structure. In addition, packing and the like are provided between the panel instrument and the control panel to provide waterproofing and dustproofing. Such devices are:
For example, Japanese Utility Model Publication No. 7-16975, Japanese Utility Model Publication No. 7-43
612 and the like.

FIG. 6 shows the configuration of such a conventional panel instrument.
Shown in In the figure, 1 is a panel, 2 is a panel instrument case, formed in a cylindrical shape, and a circuit board is housed inside,
It has a terminal block on the rear surface and is attached to panel 1. Reference numeral 3 denotes a rubber packing, which is formed in a substantially ring shape, is wound around the case 2, and is interposed between the panel 1 and the case 2 to perform waterproof and dustproof. Reference numeral 4 denotes a front cover, which has a switch and a display unit, and is attached to an opening of the case 2. Reference numeral 5 denotes a rubber packing, which is formed in a substantially ring shape, is wound around the outer periphery of the front cover 4, and is interposed between the case 2 and the front cover 4 to perform waterproofing and dustproofing.

[0004]

In the case of such a structure, two types of rubber packings 3 and 5 have to be attached, and the assembling work takes time. Further, since the rubber packing is easily detached, there is a problem that waterproof and dustproof cannot be reliably performed.

It is an object of the present invention to provide a panel instrument which does not require the installation of a packing and can reliably perform waterproofing and dustproofing.

[0006]

SUMMARY OF THE INVENTION The present invention has a structure in which a front cover is detachable from a case. In a panel instrument mounted on a panel, the front cover is pushed from the case by a latch mechanism so that the front cover is detached from the case. The case has a knob portion to be removed, and the case is formed integrally with the case body by two-color molding with the case body,
A first packing portion provided at a connection portion between the panel and the case body; and a first packing portion formed integrally with the case body by two-color molding and provided at a connection portion between the front cover and the case body.
And cover the knob, and together with the front cover,
A groove is formed in which the knob is inserted.
Switch unit that presses the
A second packing portion having a deformable spring portion ;
The driver is inserted into the groove, and the driver
Press the switch to rotate the driver.
And separating the front cover and the case .

[0007]

According to the present invention, since the first and second packing portions are formed integrally with the case main body, there is no need for an operation of mounting the packing. Also, since the packing does not come off, waterproof and dustproof can be reliably performed. In addition, the front cover and the case are separated by inserting the driver into the groove, pushing and rotating the driver.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. 1 and 2 are configuration diagrams showing an embodiment of the present invention. 1 is an overall view, and FIG. 2 is an enlarged view of a main part. In the figure, reference numeral 10 denotes a panel instrument case, which is formed in a cylindrical shape, accommodates a circuit board therein, has a terminal block to which a crimp terminal is attached on the rear surface, and is attached to the panel 20. Reference numeral 30 denotes a front cover, which has a switch and a display unit, is attached to the opening of the case 10, and has a latch unit 31.
And a knob portion 32 that moves the latch portion 31 when pressed.

In the case 10, a case body 11 is made of plastic and has a collar portion 12 provided on the outer periphery and a latch hole 13 into which a latch portion 31 is inserted. Reference numeral 14 denotes a first packing portion, which is made of an elastomer, is integrally formed with the case main body 11 by two-color molding, and is provided between the collar portion 12 and the panel 20.
15 is a second packing part, which is made of an elastomer,
It is integrally formed with the case main body 11 by two-color molding, is provided between the front cover 30 and the case main body 11, and
The knob cover 16 covers the knob 32. Second
The packing 15 is connected to the first packing 14 at the knob cover 16.

As shown in FIG. 3, the knob cover 16 has a switch 16a and a spring 16b. Here, in the drawings, (a) is a top view, (b) is a front view, and (c) is a bottom view. The switch portion 16a is provided in the groove portion 16 into which the driver 40 is inserted together with the front cover 30.
Form c and push the knob 32. The spring part 16b is connected to the switch part 16a, and the first packing part 14
When the switch portion 16a is pressed, it is elastically deformed.

The operation of such a device will be described below.
4 and 5 are views for explaining the operation of removing the case 10 and the front cover 30. The driver 40 is inserted into the groove 16c, and the switch 16a is pressed. As the spring part 16b is deformed, the knob part 32 is pushed, and the latch 31 comes off the latch hole 13 (FIG. 4). Then, when the driver 40 is rotated, the front cover 30 is detached from the case main body 11 (FIG. 5).

When the front cover 30 is attached to the case main body 11, the latch 31 moves when the front cover 30 is fitted into the case main body 11. Further, when fitted, the latch 31 is fitted into the latch hole 13 and the front cover 30 is fixed to the case body 11. To attach the case 10 to the panel 20, the case 10 is inserted into the mounting hole from the front of the panel 20. Further, waterproofing and dustproofing of the case 10 and the panel 20 can be achieved by the first packing portion 14.

As described above, the first and second packing portions 1
Since the members 4 and 15 are formed integrally with the case main body 11 by two-color molding, there is no need for an operation of attaching packing. In addition, since it is integrally molded, the packing does not come off, so that waterproofing and dustproofing can be reliably performed. Further, the above embodiment has the following effects. Conventionally, finger guards are provided for the terminals of the case according to safety standards. Such a configuration is described in Japanese Utility Model Laid-Open No. 3-124482. In recent years, panel instruments have been able to reduce the size of large panel instruments with technological advances.
The finger guard limits the mounting area and limits miniaturization.

Therefore, it is necessary to eliminate the finger guard. In this case, it is necessary to prevent the front cover from being removed by hand in accordance with safety standards, and it is necessary to reduce the size of the knob cover. However, if you make the knob cover smaller,
Since the rubber packing does not deform, the knob cannot be pushed, and the front panel cannot be removed from the case. Also, if the knob cover is forcibly pressed, the rubber packing will be broken. Due to this break, waterproofing and dustproofing cannot be performed reliably. On the other hand, in the present embodiment, the switch 16a, the spring 16b, the groove 1
6c allows the driver 40 to separate the case 10 and the front cover 30 while maintaining waterproofness and dustproofness.

[0016]

According to the present invention, since the first and second packing portions are formed integrally with the case body by two-color molding, there is no need to attach the packing. In addition, since it is integrally molded, the packing does not come off, so that waterproofing and dustproofing can be reliably performed. Also, the switch, spring, and groove
The knob cover is small while maintaining waterproof and dustproof
To prevent the front cover from being removed by hand.
Eliminates the need to provide a finger card at the terminal of the source,
Even if panel instruments are miniaturized in compliance with safety standards,
The case and the front cover can be easily separated by the rivet .

[Brief description of the drawings]

FIG. 1 is an overall side view showing an embodiment of the present invention.

FIG. 2 is an enlarged view of a main part showing an embodiment of the present invention.

FIG. 3 is a diagram showing an enlarged configuration diagram of a knob cover section 16;

FIG. 4 is a diagram illustrating an operation of removing the case 10 and the front cover 30.

FIG. 5 is a diagram illustrating an operation of removing the case 10 and the front cover 30.

FIG. 6 is a diagram showing a configuration of a conventional panel instrument.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Case 11 Case main body 14 1st packing part 15 2nd packing part 16 Knob cover part 16a Switch part 16b Spring part 16c Groove part 20 Panel 30 Front cover 31 Latch 32 Knob part 40 Driver

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor ▲ Hama ▼ Takayuki Tada 2-9-132 Nakamachi, Musashino-shi, Tokyo Inside Yokogawa Electric Corporation (56) References Japanese Utility Model Showa 50-133153 (JP, U ) Actually open sho 59-134017 (JP, U) Actually open sho 61-34419 (JP, U) Actually open sho 62-40521 (JP, U) Actually open 7-16975 (JP, Y2) (58) Field (Int.Cl. ⁶ , DB name) G01D 11/24 G01D 11/30

Claims (1)

(57) [Claims] 1. A panel instrument having a structure in which a front cover can be detached from a case and attached to a panel, wherein the front cover has a knob for removing the front cover from the case by a latch mechanism when pressed. A case is formed integrally with the case body by two-color molding , a first packing portion provided at a joint between the panel and the case body, and integrally formed by the two-color molding with the case body. And provided at a joint between the front cover and the case body,
Groove that covers the drive unit and where the driver is inserted together with the front cover.
Switch that presses the knob by being pressed.
And a spring portion that is elastically deformed by being coupled to the switch portion.
It provided a second packing unit with bets, the driver
Insert into the groove and press the switch with a screwdriver.
Then, rotate the screwdriver to cover the front cover.
And a case separated from the case .