JP5133754B2 - Panel instrument - Google Patents

Description

  The present invention relates to a panel instrument that is attached to a panel such as a control panel and controls a process amount such as temperature, and more particularly to a panel instrument that can easily draw out and store internal devices in the instrument as needed.

  Conventionally, panel instruments such as sequencers and temperature controllers have an operation unit for setting predetermined parameters such as temperature, pressure, and flow rate, and a display unit for displaying measurement results and device status on the front cover. It is provided and used on a panel such as a control panel. In this type of panel instrument, it is necessary to easily replace parts of internal units such as circuit boards housed inside the casing of the equipment and rewrite the CPU according to specification changes. While it is necessary to pull out from the front surface of the panel and casing and use them for maintenance work, it is necessary to ensure the waterproof and dustproof properties of the casing panel and the front cover against the casing when the panel is installed. is there.

  The above issues are contradictory, and in the design with the ease of separation of the front cover in mind, the waterproof and dustproof properties are second only, and in the design that increases the coupling strength between the front cover and the casing with the waterproof and dustproof properties in mind. The front cover is difficult to remove.

In this regard, as shown in Patent Document 1 below, there is known one provided with a sheet that is adhered and adhered to the front edge of the instrument casing over the entire circumference to seal the front opening of the instrument casing. .
Japanese Patent Application Laid-Open No. 2004-255798

  However, in the device structure in Patent Document 1, the concave portion provided in an annular shape on the front side of the flange and the surface sheet attached to the bezel mask are peeled off from the front surface, and the bezel mask holding the circuit board is removed from the circuit board. Since the sheet must be pulled out to the front, it is necessary to attach and detach the surface sheet at the time of maintenance. Therefore, the maintenance work is complicated, and it is necessary to prepare a replacement member for the adhesive member and the sheet.

  Accordingly, the present invention has been made to solve the above-described problem, and when connecting the casing and the front cover, the waterproof and dustproof properties are ensured, and the front cover can be pulled out together with the inner unit by a simple operation. It is intended to provide such a panel instrument.

In order to achieve the above object, a panel instrument according to claim 1 has a flange integrated with a peripheral edge of a front surface, and a casing inserted and attached to an opening formed in a predetermined panel;
A front cover having a display unit and an operation unit, and integrally connecting internal devices including a circuit board housed in the casing;
A pair of upper and lower insertion pieces to be inserted into the upper inner side and the inner bottom surface of the casing is provided at the rear part of the front cover, and an upper surface of the upper side insertion piece has an opening opened on the upper surface of the front part of the casing. A locking claw to be engaged with the stop hole is projected, and the lower side insertion piece is provided with a predetermined gap between the front inner bottom surface of the casing so that the front cover is loosely fitted,
By tilting the front cover upward and dropping it downward, and further pulling the front cover forward, the lower insertion piece comes into surface contact with the inner bottom surface of the front cover so that the locking claw is It is characterized by being completely detached from the locking hole.

  The panel instrument according to claim 2 is sandwiched between the flange of the casing and the front peripheral edge of the panel and between the front end of the casing and the rear surface of the front cover, respectively. The seal member which seals the periphery of this is provided.

  The panel instrument according to claim 3 is the panel instrument according to claim 1 or 2, wherein the insertion is provided in the vicinity of the upper and lower corners inside the rear end of the casing at both sides of the rear part of the front cover when the front cover is fitted. A guide groove for guiding the circuit board inserted and connected to the slot is formed.

The panel instrument according to claim 4 is the panel instrument according to any one of claims 1 to 3, and further communicates with a mounting hole formed in an inner part of a recess formed below the front side of the front cover. And a convex portion formed with an inclined portion having a predetermined angle at the lower end portion, and provided through the rear end side of the front cover.
A screw hole portion provided on an inner bottom surface of the casing so as to extend from the rear end side to the opening side, and having a screw hole communicating with the insertion hole of the convex portion when the front cover is fitted to the casing; ,
In order to bring the end surface of the convex portion and the end surface of the screw hole portion into surface contact so that the insertion hole of the convex portion and the screw hole of the screw hole portion communicate with each other. A position guide piece formed with an inclined part having a predetermined angle for guiding the convex part to the screw hole part when the front cover is fitted to the casing;
When the front cover is fitted to the casing, the bottom surface of the convex portion comes into surface contact with the inner bottom surface of the casing, and further, an operation of pushing the front cover is added, whereby the inclined portion of the convex portion is moved to the position guide. The front surface in a state where the end surface of the convex portion comes into surface contact with the end surface of the screw hole portion while contacting the inclined portion of the piece and the bottom surface of the convex portion is placed on the position guide piece. The cover is fitted to the casing.

  According to the panel instrument of the present invention, when the inner instrument is pulled out from the casing, the front cover is inclined upward, and the front cover is further pulled to the front side, so that the interior of the front cover and the circuit board connected to the front cover can be obtained. The device can be easily pulled out of the casing. Further, since the gap between the predetermined panel and the casing and the casing and the front cover are firmly bonded via the seal member, sufficient waterproof and dustproof properties can be secured.

  In addition, the front cover can be pulled out by tilting the front cover upward and pulling the front cover forward, so that it cannot be pulled out only by removing the screws used as a fixing means for the front cover. It has the effect of preventing accidents such as dropping due to unintentional withdrawal.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. 1, 3 and 4 are perspective views showing a panel instrument according to the present invention, FIG. 2 is a sectional view showing a state in which the panel instrument is fixed to the panel, and FIGS. 5A to 5C are front views of the panel instrument. FIGS. 6A to 6E are cross-sectional explanatory views for explaining an operation procedure when the front cover in the panel instrument is removed from the casing.

  First, the structure of the panel instrument of this example is demonstrated, referring FIGS. In each figure, the panel instrument 1 includes a rectangular parallelepiped casing 2 having a front opening and a front cover 3 attached to the front opening of the casing 2, and a flange 2 a and a front cover 3 integrated with the front peripheral edge of the casing 2. The rear periphery is fitted and fixed to a rectangular opening 4a formed in a panel 4 such as a control panel via a seal member 5.

  The sealing member 5 is a rectangular frame-shaped molded body made of rubber and synthetic resin material having excellent waterproof properties, ensuring waterproof / dustproof properties between the casing 2 and the panel 4, and the front cover 3 and the casing 2. As shown in an enlarged view of the portion A in FIG. 2, it is a concave cross section fitted to the flange 2a, and its rear surface is the opening 4a of the panel 4. The front surface is narrowly attached to the peripheral edge between the front end of the casing 2 and the back surface of the front cover 3 to seal and seal each peripheral edge.

  A large number of heat radiation holes 2 b are opened in the outer peripheral portion of the casing 2. In addition, a connection board is provided on the inner side of the rear end of the casing 2, and a screw terminal portion (all not shown) is provided on the rear surface for connecting to various external sensors and lead wires of external devices to be controlled. It has been. Further, as shown in the drawing, a guide groove 2c is formed in the vicinity of the upper and lower corners inside the rear end of the casing 2 to guide a circuit board 15 to be described later attached to the front cover 3 when the front cover 3 is fitted. Yes.

  An almost central portion of the front cover 3 is opened, and a thin display portion 6 such as an LCD is fitted and fixed to the back surface of the opening 3a through a protective sheet 6a. Further, a horizontally long recess 3b is formed below the display unit 6 in the front cover 3, and a horizontally long rectangular switch box 7 constituting an operation unit is formed at the lower edge of the front cover 3 in the recess 3b. It is fitted so as to be able to tilt forward through the hinge 7a.

As shown in FIG. 1, cursor keys 8 and various operation keys 9 are arranged on the front surface of the switch box 7, and an operation knob 10 is projected from the upper center of the switch box 7. As shown in FIGS. 3 and 4, the switch box 7 is configured such that by pulling the operation knob 10 toward the front side, the switch box 7 can rotate downward from the hinge 7 a and look into the recess 3 b.
In addition, the code | symbol 11 is a flexible flat cable which connects the switch box 7 and the circuit board 15 mentioned later.

  As shown in FIGS. 3 and 4, a pair of left and right mounting holes 3 c communicating with screw hole portions 2 e (see FIG. 5) formed on the front inner bottom side of the casing 2 are formed in the inner back portion of the recess 3 b. The front cover 3 is firmly fixed to the front surface of the casing 2 by screwing screws B as fixing means through the mounting holes 3c, and the front cover 3 is removed by removing the screws B as shown in FIG. It can be pulled out of the casing.

  On the rear end side of the front cover 3, as shown in FIG. 5, a protruding portion 3 e is formed by extending an insertion hole 3 d communicating with an attachment hole 3 c into which the screw B is screwed, formed at a substantially central portion. . That is, when the front cover 3 is fitted, the end surface of the convex portion 3e and the end surface of the screw hole portion 2e are in surface contact, so that the insertion hole 3d of the convex portion 3e and the screw hole 2f of the screw hole portion 2e are formed. The front cover is fixed to the casing 2 by screwing the screw B into the screw hole 2f. In addition, an inclined part 3f for smoothly fitting the front cover 3 in contact with an inclined part 2h of the position guide piece 2g described later has a predetermined angle at the lower end of the convex part 3e. Is formed.

  In front of the end face of the screw hole portion 2e, the bottom surface of the convex portion 3e is placed when the front cover 3 is fitted, and the center of the screw hole 2f of the screw hole portion 2e and the insertion hole 3d of the convex portion 3e. A position guide piece 2g for matching the center is formed to extend to the front opening side. In front of the position guide piece 2g, there is an inclined portion 2h that is in contact with the inclined portion 3f of the convex portion 3e when the front cover 3 is fitted and guides the fitting thereof at a predetermined angle (substantially equivalent to the inclined portion 3f). Angle).

  When the front cover 3 is fitted, first, the front cover 3 is fitted to the casing 2 so that the bottom surface of the convex portion 3e is in surface contact with the inner bottom surface of the casing 2, as shown in FIG. As shown in FIG. 5B, the inclined portion 3f of the convex portion 3e and the inclined portion 2h of the screw hole portion 2e are brought into contact with each other by being pushed a little while keeping the state where the front cover 3 is inclined upward. Then, as shown in FIG. 5C, by further pushing the front cover 3, the inclined portion 3f of the convex portion 3e slides while contacting the inclined portion 2h of the position guide piece 2f, and the convex portion 3e The bottom surface is placed on the position guide piece 2g.

  Insertion pieces 12 and 13 inserted through the upper and lower surfaces of the casing 2 are integrally extended on the upper and lower sides of the rear portion of the front cover 3, and the insertion pieces are connected to the insertion pieces 12 and 13 on both sides. The shared side slot 14 is integrally provided, and the front ends of a plurality of circuit boards 15 constituting the internal unit are inserted inside each slot 14. Then, the circuit board 15 inserted into the front cover 3 is electrically connected to the display unit 6, the cursor key 8, and the operation key 9 on the front cover 3 using connection parts such as a flexible flat cable 11. . In addition, an engagement groove 12a for loosely fitting the engagement piece 15a of the circuit board 15 when the circuit board 15 is attached to the insertion piece 12 is formed at predetermined positions on both ends of the upper insertion piece 12. ing. Since the circuit board 15 is loosely fitted in the engaging groove 12a, the circuit board 15 can be slid when the front cover 3 is removed, so that the removal operation can be performed smoothly.

  A pair of left and right locking claws 16 protrude from the upper surface of the upper side insertion piece 12. Correspondingly, a pair of left and right locking holes 2d are opened on the upper surface of the front portion of the casing 2, and when the front cover 3 is attached, the locking claws 16 are engaged as shown in FIG. The circuit board 15 is engaged with the stop hole 2d and kept closed, and each circuit board 15 is electrically connected to the display unit 6 and the switch box 7 on the front side. Further, the lower insertion piece 13 is arranged in front of the casing 2 so that the front cover 3 is loosely fitted to the casing 2 when the front cover 3 is pulled out by removing the locking claws 16 from the locking holes 2d. It is formed with a predetermined gap 13a between the inner bottom surface.

  Next, an operation procedure for removing the front cover 3 from the casing 2 in the panel instrument configured as described above will be described with reference to FIGS.

  First, in (a), the front cover 3 is fixed to the panel 4 together with the casing 2 in a state where the front cover 3 is located on the front surface of the panel 4 as in FIG. From this state, as shown in (b), when the switch box 7 is tilted toward the front side and the screw B is pulled out by a screwdriver or the like, the front cover 3 can be pulled out together with the circuit board 15. Since 16 remains locked in the locking hole 2d, it is held in a posture where it cannot be pulled out.

  Therefore, as shown in (c), by slightly lifting the front cover 3 while pulling it forward by hand (in the direction of arrow a in the figure), the front cover 3 is inclined upward, and then the front cover 3 is lowered (in the figure). After being lowered in the direction of arrow (b) and pulled slightly forward (in the direction of arrow c in the figure), as shown in (d), the lower insertion piece 13 is in surface contact with the inner bottom surface of the casing 2 so that the gap 13a is eliminated. Since the installation height with respect to the inner bottom surface of the casing 2 is reduced, the locking claw 16 is completely removed from the locking hole 2d and can be completely pulled out. Thereafter, as shown in FIG. 4E and FIG. 4, the circuit board 15 can be pulled out as it is.

  In other words, after the screw B is pulled out, the internal device cannot be pulled out unless the locking claw 16 is removed from the locking hole 2d by an artificial operation. Even when the instrument 1 is attached, since there is no natural extraction operation after the screw B is removed, a fall accident or the like is prevented in advance.

  After that, after replacing the circuit board 15 or rewriting the CPU mounted on the circuit board 15, if the front cover 3 is attached together with the circuit board 15 in the reverse procedure, the maintenance work of the internal unit is performed. finish.

Thus, the panel instrument 1 described above is provided with a pair of upper and lower insertion pieces to be inserted into the upper inner side and the inner bottom surface of the casing 2 at the rear part of the front cover 3, and the upper surface of the upper side insertion piece 12 has A locking claw 16 engaged with a locking hole 2d opened on the upper surface of the front portion of the casing 2 is projected, and the lower insertion piece 13 is connected to the inner bottom surface of the front portion of the casing 2 so that the front cover 3 is loosely fitted. Is provided with a predetermined gap 13a between them, and the front cover 3 is inclined upward, and the front cover 3 is further pulled toward the front side, so that the lower insertion piece 13 is connected to the inner bottom surface of the front cover 3. The engaging claw 16 is completely separated from the engaging hole 2d by surface contact.
Thereby, at the time of maintenance of an internal unit, the internal units such as the front cover 3 and the circuit board 15 connected thereto can be easily pulled out from the casing.

  Further, since the front cover 3 can be pulled out by tilting the front cover 3 upward and further pulling the front cover 3 toward the front side, it is only necessary to remove the screws B used as fixing means for the front cover 3. The impossible state is maintained, and it is possible to prevent accidents such as dropping due to unintentional withdrawal.

  By the way, although the description about the fixing method of the casing 2 with respect to the panel 4 was abbreviate | omitted in the form mentioned above, the latching claw etc. are protrudingly provided immediately after the flange 2a, for example, the casing 2 is the opening part of the panel 4 In addition to being able to tightly attach the panel 4 to the flange 2a with this locking claw in a state of being fitted to the bracket, it can also be fixed by various dedicated mounting brackets.

  The front cover 3 has been described as being configured to be screwed to the casing 2 using screws B as fixing means. However, after the instrument is installed on the panel 4, the front cover 3 is mounted in a state of being fixed to the casing 2. If it is a structure, a fixing means will not be specifically limited.

It is a perspective view which shows the state which attached the front cover to the casing of the panel instrument which concerns on this invention. It is sectional drawing of rear part abbreviation containing the partially expanded part which shows the state which fixed the instrument to the panel. It is a perspective view which shows the state which removed the screw for fixing a front cover to the casing. It is a perspective view which shows the state which pulled out the front cover with the circuit board from the casing. (A)-(c) It is explanatory drawing at the time of fitting of the front cover in the panel instrument. (A)-(e) It is sectional explanatory drawing for demonstrating the operation procedure at the time of removing the front cover in the panel instrument from a casing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Panel instrument 2 Casing 2a Flange 2b Radiation hole 2c Guide groove 2d Locking hole 2e Screw hole part 2f Screw hole 2g Position guide piece 2h Inclination part 3 Front cover 3a Opening part 3b Concave part 3c Mounting hole 3d Insertion hole 3e Convex part 3f Inclination Part 4 Panel 4a Opening 5 Sealing member 6 Display part 6a Protection sheet 7 Switch box (operation part)
7a Hinge part 8 Cursor key 9 Operation key 10 Operation knob 11 Flexible flat cable 12 Upper insertion piece 13 Lower insertion piece 14 Side slot 15 Circuit board 15a Engagement piece 16 Locking claw

Claims (4)

A casing having a flange integrated with the front peripheral edge, and inserted and attached to an opening formed in a predetermined panel;
A front cover having a display unit and an operation unit, and integrally connecting internal devices including a circuit board housed in the casing;
A pair of upper and lower insertion pieces to be inserted into the upper inner side and the inner bottom surface of the casing is provided at the rear part of the front cover, and an upper surface of the upper side insertion piece has an opening opened on the upper surface of the front part of the casing. A locking claw to be engaged with the stop hole is projected, and the lower side insertion piece is provided with a predetermined gap between the front inner bottom surface of the casing so that the front cover is loosely fitted,
By tilting the front cover upward and dropping it downward, and further pulling the front cover forward, the lower insertion piece comes into surface contact with the inner bottom surface of the front cover so that the locking claw is A panel instrument characterized by being completely removed from the locking hole. 2. A sealing member that is sandwiched between a flange of the casing and a front peripheral edge of the panel and between a front end of the casing and a rear surface of the front cover and seals each peripheral edge. Panel instrument as described. Guide grooves are formed in the vicinity of the upper and lower corners inside the rear end of the casing to guide the circuit board inserted and connected to insertion slots provided on both sides of the rear portion of the front cover when the front cover is fitted. The panel instrument according to claim 1 or 2. Further, the front cover has an insertion hole that communicates with an attachment hole formed in an inner part of a recess formed below the front side of the front cover, and is provided to extend from the rear end side of the front cover, and has a lower end. A convex part formed with an inclined part having a predetermined angle in the part;
A screw hole portion provided on an inner bottom surface of the casing so as to extend from the rear end side to the opening side, and having a screw hole communicating with the insertion hole of the convex portion when the front cover is fitted to the casing; ,
In order to bring the end surface of the convex portion and the end surface of the screw hole portion into surface contact so that the insertion hole of the convex portion and the screw hole of the screw hole portion communicate with each other. A position guide piece formed with an inclined part having a predetermined angle for guiding the convex part to the screw hole part when the front cover is fitted to the casing;
When the front cover is fitted to the casing, the bottom surface of the convex portion comes into surface contact with the inner bottom surface of the casing, and further, an operation of pushing the front cover is added, whereby the inclined portion of the convex portion is moved to the position guide. The front surface in a state where the end surface of the convex portion comes into surface contact with the end surface of the screw hole portion while contacting the inclined portion of the piece and the bottom surface of the convex portion is placed on the position guide piece. The panel instrument according to claim 1, wherein a cover is fitted to the casing.

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