JP5331296B2 - Microcomputer gas meter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a microcomputer gas meter that facilitates attachment and detachment of a terminal board cover and that can reduce the cost. <P>SOLUTION: The terminal board box 23 that has an opening 25 whose front surface opens and a printing board, a terminal board, or the like on its rear surface is disposed integrally in a controller case 21; a guide section 28 and engaging section 29 are disposed on both side parts of the upper edge of the terminal board box 23, and a single attachment screw hole 31 is disposed at the lower edge; a guide surface 36 guided to the guide section 28 of the terminal board box 23 and an engaging claw section 37, engaged with the engaging section 29 are disposed on both side parts of the upper edge of the terminal board cover 32; and a single attaching screw 40 to be screwed into the attaching screw hole 31 is disposed at the lower edge. In the engaged state of the engaging claw section 37 with the engaging section 29, while the guide surface 36 of the terminal board cover 32 is guided to the guide section 28 of the terminal board box 23, the attaching screw 40 is fastened to the attachment screw hole 31. <P>COPYRIGHT: (C)2008,JPO&amp;INPIT

Description

  The present invention relates to a microcomputer gas meter provided with a shut-off valve that shuts off gas flow in the event of abnormal use of gas, when an earthquake occurs, when gas pressure drops, or in other emergency situations.

  Built-in shut-off valve inside the gas meter case, seismic device for detecting earthquakes, pressure sensor and control circuit for detecting gas pressure drop, and shut-off valve in case of emergency such as abnormal use of gas, earthquake or gas pressure drop A microcomputer gas meter is known in which a bidirectional shutoff valve is operated to shut off the gas flow (see, for example, Patent Document 1).

  This microcomputer gas meter is configured, for example, as shown in FIGS. That is, the gas meter case 1 includes an upper case 2 and a lower case 3. The upper case 2 is provided with a gas inlet gold 4 and a gas outlet gold 5 connected to a gas pipe, and a shut-off valve (not shown) for shutting off the gas flow passage is provided inside the upper case 2. . The lower case 3 is provided with a controller case 6, and the controller case 6 is provided with a return panel 7 for the shut-off valve and a display panel 9 provided with a security display portion 8.

  A printed circuit board 10 having an electronic circuit for controlling the shutoff valve is provided inside the controller case 6, and the printed circuit board 10 is provided with a battery 10a, a reed switch 10b, and the like. The printed circuit board 10 extends to the inside of the terminal block box 12 that houses the terminal block 11 and the like. The terminal block box 12 has an opening 13 whose front surface is open, and metal fittings 14 are insert-molded on the left and right sides of the opening 13, and mounting screws 15 are provided in the metal fittings 14.

The opening 13 of the terminal block box 12 is covered with a terminal block cover 16, and the terminal block cover 16 is provided with mounting screws 17 corresponding to the mounting screw holes 15. Then, the opening 13 of the terminal block box 12 is covered with the terminal block cover 16, and the mounting screws 17 are tightened into the mounting screw holes 15 in a state where the two mounting screws 17 are positioned in the mounting screw holes 15. A cover 16 is attached to the controller case 6.
JP 2000-292237 A

However, since the conventional terminal block cover 16 is attached to the controller case 6 by the two mounting screws 17, it is necessary to position the two mounting screws 17 in the mounting screw holes 15 when the terminal block cover 16 is mounted. Yes, installation and removal is troublesome. Further, since the metal fitting 14 is insert-molded in the terminal block box 12 and the mounting screw hole 15 is provided in the metal fitting 14, the number of parts is increased, the molding becomes complicated, and the cost is increased.
The present invention has been made paying attention to the above circumstances, and an object of the present invention is to provide a microcomputer gas meter in which the mounting and removal of the terminal block cover is simple and the cost can be reduced. .

In order to achieve the above-described object, the present invention provides a gas meter case, a terminal block box provided in the gas meter case and having an opening, and a terminal block covering the opening of the terminal block box. and the cover, is formed at the edge at one side of the terminal cover, and a joint contact position to the terminal block box member, provided in the rear area section of the terminal cover located in the vicinity of the joint portion A plurality of engaging claws that protrude from the back side of the terminal block cover and have a middle portion bent so that a tip portion is directed toward the position of the joining portion, and the plurality of engaging claws are opposed to the engaging claws , respectively. A plurality of engaging portions which are provided at positions of the terminal block box and respectively engage the tip portions of the engaging claws, and a portion which positions and abuts the joint portion of the terminal block cover with the engaging portion interposed therebetween; the opposite side Positioned at the terminal block box with a gap between the engagement portion and the tip of the engagement claw portion inserted into the gap around the back of the engagement portion The engaging claw portion is guided to a position where the tip portion is engaged with the engaging portion, and an intermediate portion of the engaging claw portion is received at a position where the tip portion is engaged with the engaging portion. A microcomputer gas meter, comprising: a guide surface that supports the engaging claw portion .

According to a second aspect of the present invention, the joining portion of the terminal block cover is an upper edge portion of the terminal block cover, and one mounting screw hole is provided in the other edge portion of the terminal block cover, and is inserted through the mounting screw hole. 2. The microcomputer gas meter according to claim 1, wherein the terminal block cover is fastened to the terminal block box with a mounting screw.

A third aspect of the present invention is the microcomputer gas meter according to the first or second aspect, wherein the terminal block box is formed of a synthetic resin material, and the guide surface and the engaging portion are formed on the terminal block box with the terminal block box. It is provided integrally.

According to the present invention, it is easy to attach and remove the terminal block cover, reduce the number of parts of the microcomputer gas meter, and reduce the cost of the microcomputer gas meter .

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

1 to 4 show a first embodiment of a microcomputer gas meter, FIG. 1 is a front view of the microcomputer gas meter, FIG. 2 is a vertical side view of a controller case, and FIGS. 3 (a) and 3 (b) are attachments of terminal block covers. FIG. 4 is a perspective view of the engaging portion and the engaging claw portion, and the same components as those in the prior art are denoted by the same reference numerals and description thereof is omitted.
The controller case 21 is integrally formed of a synthetic resin material, and the controller case 21 is fixed to the front portion of the lower case 3 by a plurality of fixing screws 22. A terminal block box 23 is integrally provided at a lower portion of the controller case 21, and the terminal block box 23 includes a peripheral wall 24 and an opening 25 having an open front surface. A printed circuit board 10 is provided on the rear surface of the terminal block box 23 so as to extend from the controller case 21, and the terminal block 11 is fixed to the printed circuit board 10.

  Two projecting portions 26 and 27 projecting inward are provided symmetrically on the inner side surface of the peripheral wall 24 at the left and right side portions of the upper edge portion 23a of the terminal block box 23, respectively. One projecting portion 26 is formed with a guide portion 28 having an inclined surface of approximately 45 °, and the other projecting portion 27 is formed with an engaging portion 29 having an inclined surface so as to be substantially parallel to the guide portion 28. Yes. The guide portion 28 and the engaging portion 29 are spaced apart from each other, and a gap portion 30 into which an engaging claw portion 37 described later enters is provided between the guide portion 28 and the engaging portion 29. Furthermore, a single mounting screw hole 31 is provided outside the peripheral wall 24 at a substantially central portion of the lower edge portion 23 b of the terminal block box 23.

  The terminal block box 23 is provided with a terminal block cover 32 that closes the opening 25. The terminal block cover 32 is integrally formed of a synthetic resin material in the same manner as the controller case 21, and the terminal block cover 32 has a joint portion 33 joined to the upper edge portion 23 a of the terminal block box 23 and a peripheral wall 24 of the terminal block box 23. A peripheral wall 34 that fits outside is provided.

  Further, a pair of left and right substantially L-shaped projections 35 corresponding to the guide portion 28 and the engagement portion 29 of the terminal block box 23 are provided back to back on the inner surface portion of the terminal block cover 32 on the joint portion 33 side. ing. A guide surface 36 that is guided by the guide portion 28 of the terminal block box 23 is formed on the outer side of the projecting portion 35, and the inner surface, that is, the position facing the inner surface of the terminal block cover 32, An engagement claw portion 37 that is engaged with the engagement portion 29 is formed.

  The guide surface 36 and the engagement claw portion 37 are formed by inclined surfaces so as to be substantially parallel, the inclination angle thereof coincides with the guide portion 28 and the engagement portion 29, and the guide surface 36 slides on the guide portion 28 and is engaged. The pawl portion 37 is configured to enter the gap portion 30 and engage with the engaging portion 29.

Further, the peripheral wall 34 at the lower edge portion of the terminal block cover 32 is provided with a single concave portion 38 corresponding to the mounting screw hole 31, and a mounting hole 39 is formed in the bottom portion of the concave portion 38. An attachment screw 40 is inserted into the attachment hole 39 and is fastened to the attachment screw hole 31.
Next, a case where the terminal block cover 32 is attached to the terminal block box 23 with the opening 25 of the terminal block box 23 closed by the terminal block cover 32 will be described. First, as shown in FIG. 3A, when the terminal block cover 32 is inclined and the joint portion 33 is positioned on the upper edge portion 23 a of the terminal block box 23, the engaging claw portion 37 is located between the protruding portions 26 and 27. Opposite the gap 30.
When the terminal block cover 32 is pushed up in the arrow B direction shown in FIG. 3A in this state, the engaging claw portion 37 enters the gap portion 30 between the projecting portions 26 and 27 and the guide surface 36. Is joined to the guide portion 28. When the terminal block cover 32 is further pushed up in the arrow B direction, the engaging claw portion 37 engages with the engaging portion 29 while the guide surface 36 slides on the guide portion 28.

Next, when the lower edge portion of the terminal block cover 32 is rotated in the direction of arrow C as shown in FIG. 3B and pressed against the terminal block box 23, the terminal block cover 32 is fitted into the terminal block box 23. The engaging claw portion 37 engages with the engaging portion 29, and the guide surface 36 is joined to the guide portion 28. When the mounting screw 40 is tightened in the mounting screw hole 31 in this state, the terminal block cover 32 is mounted in a state in which the opening 25 of the terminal block box 23 is closed.
When removing the terminal block cover 32, the mounting screws 40 are loosened and removed from the mounting screw holes 31, and the lower edge portion 32b of the terminal block cover 32 is pulled up in the direction opposite to the arrow C direction. Then, the engaging claw portion 37 of the terminal block cover 32 escapes from the gap portion 30 between the projecting portions 26 and 27, the guide portion 28 slides on the guide surface 36, and the engaging claw portion 37 becomes the engaging portion. 29, the engagement between the engagement claw portion 37 and the engagement portion 29 is released. Therefore, the terminal block cover 32 can be removed from the terminal block box 23, and wiring work and maintenance inspection for the terminal block 11 can be easily performed.
As described above, the terminal block cover 32 can be attached to the terminal block box 23 at three points including two engagement portions and one tightening portion, and the attachment and removal of the terminal block cover 32 are easy. In addition, the mounting can be performed by one mounting screw 40, and it is not necessary to insert-mold the metal fitting as in the conventional case, and the cost can be reduced.
The present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Moreover, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, the constituent elements over different embodiments may be combined.

The front view of the microcomputer gas meter which shows 1st Embodiment of this invention. The longitudinal section side view of the controller case which shows the embodiment. The embodiment is shown, (a) (b) is an explanatory view of the operation of mounting the terminal block cover. The perspective view of an engaging part and an engaging claw part which shows the embodiment. The front view of the conventional microcomputer gas meter. The front view of the state which removed the terminal block cover of the conventional microcomputer gas meter. The conventional microcomputer gas meter is shown, and the vertical side view of a controller case.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Gas meter case, 2 ... Upper case, 3 ... Lower case, 4 ... Gas inlet gold, 5 ... Gas outlet gold, 21 ... Controller case, 23 ... Terminal block box, 28 ... Guide part, 29 ... Engagement part, 31 ... Mounting screw hole, 32 ... Terminal block cover, 36 ... Guide surface, 37 ... Engagement claw, 40 ... Mounting screw

Claims (4)

A gas meter case,
A terminal block box provided in the gas meter case and having an opening;
A terminal block cover covering the opening of the terminal block box;
Formed at an edge of one side of the terminal block cover, and a joint portion that is positioned and abutted on the terminal block box side member;
A plurality of engagement members are provided in a back region of the terminal block cover located in the vicinity of the joint, and project from the back side of the terminal block cover and bend an intermediate portion so that a tip portion is directed to the position of the joint. A claw portion,
A plurality of engaging portions that are provided at positions of the terminal block box so as to face the plurality of engaging claw portions, respectively, and respectively engage the tip portions of the engaging claw portions;
The terminal block box is provided on the terminal block box with a gap between the engaging portion and the portion located on the opposite side of the portion where the contact portion of the terminal block cover is positioned and abutted across the engaging portion. The engaging claw is guided to a position where the tip of the engaging claw inserted into the gap is turned to the back side of the engaging to engage the tip with the engaging. A guide surface that receives the intermediate portion of the engaging claw portion at a position where the portion is engaged with the engaging portion and supports the engaging claw portion;
A microcomputer gas meter characterized by comprising:   The joint part of the terminal block cover is the upper edge of the terminal block cover, and is provided with one mounting screw hole on the other edge of the terminal block cover, and the mounting screw inserted through the mounting screw hole. The microcomputer gas meter according to claim 1, wherein a terminal block cover is fastened to the terminal block box. The said terminal block box is shape | molded by the synthetic resin material, The said guide surface and the engaging part were integrally provided in the said terminal block box in the said terminal block box, The Claim 1 or Claim 2 characterized by the above-mentioned. Microcomputer gas meter.   The microcomputer gas meter according to claim 1, wherein the terminal block cover is formed of a synthetic resin material, and the engaging claw portion is provided integrally with the terminal block cover.

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