JPH01314923A - Contact constitution of using amount supervising and controlling apparatus - Google Patents

Abstract

PURPOSE:To realize positive contact by providing a contact portion connected to a minus potential side inside a substrate and, forming a chevron-shaped protrusion at a confronting position to a fixed contact of a metallic casing and on a contact plate of a conductive leaf spring which is pressed when said substrate is inserted. CONSTITUTION:A hole 8c as well as a bracket is formed at a middle portion of a contact plate 8 made of phosphor bronze plate. The contact plate 8 is mounted in a gas meter casing through the hole 8c. A contact portion 8a at an upper end of the contact plate 8 has a chevron-shaped protruding contact point 8e. An end of the contact point 8e is depressed against a contact point 6 of a substrate 9 by the contact portion 8a because the contact portion 8a is deflected when the substrate 9 is inserted into the bracket assembled with the contact plate 8, and accordingly the contact plate 8 can be in positive contact with the substrate whether the surface of the contact portion 8a is attached with dusts or covered with an oxide film.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a usage amount monitoring and control device for gas, etc., and particularly to a contact configuration thereof.

(Prior art) A gas usage monitoring and control device (hereinafter referred to as the device) monitors the amount used by a consumer, and issues an alarm when there is an abnormality, or sometimes cuts off the gas supply. .

However, this device may malfunction due to external radio waves or electrical noise from external signal lines, so as a countermeasure, the negative voltage of the electronic circuit section 3 connected to the battery 4 was taken as shown in Figure 4. A method is used in which the potential side is grounded from the contact portion 6 of the device w2 to the case 1 of the aluminum device via a capacitor 5.

FIG. 5 shows the configuration of the device surrounding the contact part 6. On the bottom surface of the right end corner of the board 9 on which the electronic circuit part 3 is printed,
A board side contact portion 6 made of solder is formed to be connected to the negative potential side of the electronic circuit portion 3, and rectangular mounting holes 9a are formed on both sides of the board 9.

A resin bracket 1o is attached to the case 1 on the lower side of the board 9, and the second floor of this bracket 10 has an L-shaped mounting part 10c and a mounting hole 10b, and the upper side has a pair of holes protruding upward. There is an arrow-shaped board fixing claw 10a. A movable side contact plate 7 made of a phosphor bronze plate shown in FIG. 7 is attached to the attachment part 10c at a bent part 7b.

6 is a diagram in which the board 9 shown in FIG. 5 is inserted into the bracket 10. The board 9 is fixed by the board fixing claw 10a of the bracket IO, and the contact portions 7a of the contact plate 7 shown in FIG. It is pressed against the contact part 6 by its own spring force as shown in FIG. 8, which shows the details.

(Problem to be Solved by the Invention) However, in such a contact configuration, since the voltage and current between the contacts is very small, dust on the surface of the contact plate 7 or an oxide film on the contact plate 7 may cause the contact portion 6 to Due to insufficient contact with the contact plate 7, it was not grounded, and the device sometimes malfunctioned due to external noise.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to obtain a contact configuration for a usage monitoring and control device that can reliably ground noise from the outside.

[Structure of the invention]

(Means and effects for solving the problem) The present invention cuts into the contact portion of the movable side contact plate for grounding of the usage monitoring and control device to form a mountain-shaped protrusion bent upward. This is a contact configuration of a usage monitoring and control device that increases the reliability of contact with the contacts and reliably grounds external noise.

(Embodiment) Hereinafter, one embodiment of the contact structure of the usage monitoring and control device of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view of the contact plate 8 of the contact configuration of the usage monitoring and control device of the present invention.The contact plate 8, which is bent after press punching from a phosphor bronze plate, has a bracket 10 and a gas meter casing 1 attached to the middle part of the contact plate 8. A 68c for mounting is provided,
On one side of this lower part is a lower fixing claw 8 bent horizontally in a U-shape.
d, an upper fixing claw 8b bent downward in a U-shape is formed on one side of the upper end, and a contact portion 8a on the casing side is formed on the other side, and at the middle part of the tip of this contact portion 8a, Contact part 8a
A part of the phosphor bronze plate is bent upward as shown in FIG. 2 to form a chevron-shaped protruding contact 8e.

In the contact configuration of the usage monitoring and control device configured as described above, the tip of the protruding contact 8e is connected to the third contact portion 8a which is bent due to the insertion of the board 9 into the bracket 10 in which the contact plate 8 is assembled.
As shown in the figure, since it is pressed against the contact 6 on the substrate side and bites into it, reliable contact can be made regardless of dust or oxide film on the surface of the contact portion 8a.

〔Effect of the invention〕

As described above, according to the contact structure of the usage monitoring and control device of the present invention, the contact part connected to the negative potential side of the electronic circuit part housed inside via the capacitor is connected to the board on which the electronic circuit part is printed. The conductive spring plate on the conductive side of the case side of the device is provided with a chevron-shaped protruding contact, and the contact is made by the deflection of the spring plate when the board is inserted, so there is no chance of dust getting into the device due to the installation environment or handling. It is possible to obtain a contact configuration of a usage monitoring and control device that can reliably make contact with the user and reliably ground radio waves from the outside and electrical noise from external signal lines.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of essential parts showing an embodiment of the contact structure of the usage monitoring and control device of the present invention, FIG. 2 is a detailed view of a portion of FIG. 1,
FIG. 3 is a diagram showing the operation of the contact configuration of the usage monitoring and control device of the present invention, FIG. 4 is a connection diagram of the contact configuration of the conventional usage monitoring and control device, and FIG. 5 is a diagram of the conventional usage monitoring and control device. Fig. 6 is a partial detailed view of Fig. 5, Fig. 7 is a perspective view showing the contact configuration.
8 are detailed views of the main parts of FIG. 5. 1...Metal case 2...Usage monitoring control device 3...Electronic circuit portion 6...Contact part 8...Contact plate 8e...Protrusion contact 9...Board agent Patent attorney Rules Yudo Chika Ken Daishimaru Figure 1 Figure 3

Claims (1)

[Claims] A usage amount monitoring and control device for combustion gas, etc., in which a board on which an electronic circuit is printed is housed in a metal case, and a negative potential side of the board is grounded to the metal case when the board is inserted into the metal case, A contact portion connected to the negative potential side is provided inside the substrate, and a contact portion of a conductive spring plate that is pressed when the substrate is inserted is provided on the opposite portion of the fixed contact on the metal case side. A contact structure of a usage monitoring and control device characterized by providing a mountain-shaped protrusion that presses a contact part.