JPH10255888A - Lead connection structure onto connection terminal part of electric apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and completely connect a lead from at least an inner circuit to a connection terminal part formed at an apparatus body in an electric apparatus, for example, a circuit tester. SOLUTION: This electric apparatus 11 is formed so that the plug 22 formed at a lead 21 which is drawn from at least an inner side circuit 19 may be electrically-connected to the connection terminal part 13 formed on an apparatus body 12 freely. The connection terminal part 13 is provided with a terminal metal fitting 15 which is inserted in a tubular part 14 formed on an apparatus body 12 to be fixed, and a hole part 16 whose opening 16a is positioned at the end surface 15a of the terminal metal fitting 15 in order to introduce the inserting terminal 24 on plug 22 side, and by permitting relative pressure contact force with the inserting terminal 24 inserted in the hole part 16 to be generated freely, thus connecting the terminal metal fitting 15 and the lead 21 to each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric device such as a circuit meter, in which a lead drawn from at least an internal circuit is easily connected to a connection terminal portion provided in the device body.
Also, the present invention relates to a connection structure of a lead to a connection terminal portion of an electric device which can be securely connected.

[0002]

2. Description of the Related Art Electrical equipment such as a circuit meter is usually
A connection terminal portion is provided on the device main body, and the input / output lead connected to the external circuit and the input / output lead connected to the internal circuit are mutually connected through the connection terminal portion. It can be connected electrically.

FIG. 3 shows an example of a lead connection structure conventionally used in the above-mentioned electric equipment. In this case, the connection terminal portion 2 is directly connected to a lead 31 connected to an external circuit. A cylindrical portion 2a into which the plug 32 is introduced is provided in the main body 1, and a terminal fitting 2 is provided at the lower end of the cylindrical portion 2a.
It is formed by inserting and fixing b.

Further, a terminal plate 4a directly connected to the lead 4 of the internal circuit 3 is fastened to the female screw portion engraved on the side of the exposed end surface of the terminal fitting 2b using a screw 5. The lead 4 of the internal circuit 3 can be electrically connected to the connection terminal 2.

FIG. 4 shows another example of the lead connection structure. In this case, the connection terminal portion 7 has a plug directly connected to a lead 31 connected to an external circuit as in FIG. A cylindrical portion 7a into which the 32 is introduced is provided in the device main body 6, and a terminal fitting 7b is inserted and fixed to a lower end portion of the cylindrical portion 7a.

Further, the insulating material 1 is formed by a screw 9 which also has a function as a lead for a corresponding portion of the internal circuit 8 composed of a substrate with respect to the female screw portion engraved on the peripheral surface side of the terminal fitting 7b.
By fixing via the “0”, the corresponding portion of the internal circuit 8 can be electrically connected to the connection terminal portion 7.

[0007]

By the way, even in the connection structure shown in FIGS. 3 and 4 as a conventional example, the internal circuits 3 and 8 are connected to the equipment body 1 by tightening screws 5 and 9. , 6 can be electrically connected.

However, in the case of the conventional example shown in FIG. 3, since the screw 5 has to be fed in from the direction of the exposed end face of the terminal fitting 2b, the screw 5 is screwed by using a fastening tool such as a screwdriver in a narrow space. 5 had to be fixed, which was inconvenient to complicate the work.

In the case of the conventional example shown in FIG.
Since the corresponding portion of the internal circuit 8 is directly connected to the connection terminal portion 7, it is necessary to secure a so-called creepage distance sufficiently. The dead space is generated in the circuit 8 itself, and consequently, there is an inconvenience that a compact design is difficult to be made.

In addition, the connection structures shown in FIGS. 3 and 4 all use screws 5 and 9 to fasten and connect the internal circuits 3 and 8 to the connection terminals. There is a possibility that the screws 5 and 9 that have been stopped may become loose. If the screws 5 and 9 are loosened, the internal resistance increases accordingly, and the connection portion generates heat under a large current or a high voltage. If the connection terminals 2 and 7 are integrally formed of synthetic resin, There was a problem that this was melted.

The present invention has been made in view of the above-mentioned problems in the prior art, and ensures that at least a lead drawn out from an internal circuit is not screwed to a connection terminal portion provided in a device main body of an electric device such as a circuit meter. It is an object of the present invention to provide a connection structure of a lead to a connection terminal portion of an electric device which can be connected.

[0012]

Means for Solving the Problems The present invention has been made to achieve the above-mentioned object, and its structural feature is that at least a lead drawn out from an internal circuit is provided for a connection terminal portion provided in an apparatus main body. In an electric device which can be electrically connected to a plug, the connection terminal portion is used for introducing a terminal fitting inserted and fixed in a tubular portion provided in the device main body and an insertion terminal on the plug side. A hole in which an opening is located at an end face of the terminal fitting, and the terminal fitting and the lead are interconnected by freely generating a relative pressing force between the terminal fitting and the insertion terminal inserted into the hole. That is.

In this case, the insertion terminal of the plug can be freely expanded and contracted in the circumferential direction, and the diameter of the hole of the terminal fitting is smaller than that of the insertion terminal when the diameter is expanded, so that the distance between the hole and the insertion terminal can be reduced. It is possible to freely generate relative pressing force between
The hole of the terminal fitting is provided with a spring material on its inner peripheral surface that allows the insertion terminal of the plug to advance and retreat and press against it, and the insertion terminal has a diameter smaller than the diameter of the hole, so that the hole and the insertion terminal are , The relative pressing force can be freely generated.

[0014]

FIG. 1 is a sectional view of a main part showing a preferred example of a lead connection structure according to the present invention.
A lead 2 pulled out from at least an internal circuit 19 such as a circuit board with respect to a connection terminal portion 13 provided in the device main body 12.
1 can be freely connected to the plug 22 provided therein.

In this case, the connection terminal section 13 is
An opening 16a is located at an end face 15a located at the lower surface in the drawing of the terminal fitting 15 for inserting the insertion terminal 24 on the plug 22 side into the terminal fitting 15 inserted and fixed in the cylindrical portion 14 provided on the second part 2. And a hole 16 having a bottom.

This will be described more specifically with reference to the drawings. The connection terminal 13 provided in the device body 12 has an opening 14a into which a plug 32 of a lead 31 connected to an external circuit (not shown) is introduced. A cylindrical portion 14 having an exposed surface;
It is formed of a terminal fitting 15 having a contacted part 17 in the upper half part, which is fitted to the contact terminal 33 of the plug 32 and makes contact with each other, and which has the hole 16 in the lower half part.

The plug 22 of the lead 21 drawn out from the internal circuit 19 has a holding portion 23 for inserting and removing operation as shown in the drawing, and a base end connected to the lead 21 in the holding portion 23. An insertion terminal 24 with a cavity 25 fixedly protruded and integrally formed, or an appropriate structure formed to be freely expandable and contractible in the circumferential direction, such as a banana plug (not shown). Can be used.

In this case, since the diameter of the hole 16 of the terminal fitting 15 is smaller than the diameter of the insertion terminal 24 when the diameter is increased, the relative diameter between the hole 16 and the insertion terminal 24 is increased. The pressing force can be freely generated, and the two can be reliably brought into contact with each other.

In the present invention, a spring material (not shown) which allows the insertion terminal to advance and retreat on the inner peripheral surface of the hole 16 of the terminal fitting 15 and presses against the inner terminal, for example, a small-diameter ball is provided on the inner peripheral surface of the hole 16. And a spring material formed by attaching a leaf spring to which the pressure contact force is applied in the length direction of the hole 16 (the direction in which the insertion terminal 24 moves forward and backward), and the like.
By simply forming the insertion terminal having a rod shape with a diameter smaller than the diameter of the hole 16, it is possible to freely generate a relative pressing force between the hole 16 and the contact terminal. it can.

Further, in the lead connection structure according to the present invention, the connection relationship between the plug 22 provided in the lead 21 drawn out from the internal circuit 19 and the connection terminal portion 13 has been described. The plug 32 of the lead 31 connected to the side circuit is formed in the same structure as the plug 22, and a hole similar to the hole 16 is provided in the upper part of the terminal fitting 15 so that they can be connected to each other. May be used. Further, the electric device 11 includes not only a circuit meter such as a voltmeter but also all devices that need to electrically connect at least the connection terminal portion 13 and the internal circuit 19 via the lead 21.

Next, the operation of the present invention will be described with reference to FIG. 2. In the connection terminal portion 13 provided in the device main body 12, a plug 32 of a lead 31 connected to an external circuit (not shown) has an opening. The plug 3 is inserted into the contacted portion 17 of the terminal fitting 15 by being inserted into the cylindrical portion 14 from the
The two contact terminals 33 can be introduced and can be electrically connected in a state where they are fitted to each other.

On the other hand, the plug 22 provided in the lead 21 drawn out of the internal circuit 19 is inserted into the bottomed hole 16 provided in the lower half of the terminal fitting 15 while grasping the holding portion 23 with fingers. By pushing the terminals 24 through the openings 16a, they can be electrically connected to each other under a dustproof structure that does not communicate with the outside.

In this case, the insertion terminal 24 of the plug 22
For example, it is formed so as to be freely expandable and contractible in the circumferential direction by interposing a gap portion 25 or the like.
6 is formed to have a smaller diameter than the insertion terminal 24 when the diameter is increased.
Is pressed down while reducing the diameter, a relative pressure contact force is generated between the hole 16 and the insertion terminal 24 by the repulsive force held by the insertion terminal 24 itself, so that the mutual connection state is secure. Things.

Therefore, at least the lead 21 drawn out from the internal circuit 19 can be easily electrically connected to the connection terminal portion 13 without using a screw as in the prior art, so that the device body is narrow. 12, the lead connection operation can be performed efficiently.

Further, since the screws are wiped out from the connection portion between the connection terminal portion 13 and the lead 21, various inconveniences caused by the loosening of the screws, which has conventionally been a problem, can be surely solved.

[0026]

As described above, according to the present invention, the insertion terminal of the plug generates a relative press-contact force with respect to the hole having the opening positioned at the end face of the terminal fitting constituting the connection terminal portion. By inserting, at least the lead drawn out from the internal circuit can be securely connected to the connection terminal side without using screws, and can be electrically connected by eliminating the cause of the increase in the internal resistance. In addition, heat generation from the connection portion can be eliminated.

Moreover, the two can be easily brought into and out of contact with each other simply by inserting / removing the plug side from / to the hole of the terminal fitting in the connection terminal part. The lead connection operation can be performed.

[Brief description of the drawings]

FIG. 1 is an essential part cross-sectional view showing a preferred example of a lead connection structure according to the present invention.

FIG. 2 is an exploded explanatory view showing a mutual relationship corresponding to FIG. 1;

FIG. 3 is an essential part cross-sectional view showing an example of a conventional lead connection structure.

FIG. 4 is an essential part cross-sectional view showing another example of a conventional lead connection structure.

[Explanation of symbols]

 1,6 Device body 2,7 Connection terminal portion 2a, 7a Cylindrical portion 2b, 7b Terminal fitting 3,8 Internal circuit 4 Lead 4a Terminal plate 5,9 Screw 10 Insulation material 11 Electric device 12 Device body 13 Connection Terminal part 14 Cylindrical part 14a Opening part 15 Terminal fitting 15a End face 16 Hole part 16a Opening 17 Contacted part 19 Internal circuit 21, 31 Lead 22, 32 Plug 24 Insertion terminal 25 Void part 33 Contact terminal

Claims (3)

[Claims] 1. An electric device in which a connection terminal portion provided in the device main body can be electrically connected at least to a plug provided in a lead drawn from an internal circuit, wherein the connection terminal portion is provided in the device main body. A terminal fitting inserted and fixed in the cylindrical portion, and a hole having an opening positioned at an end face of the terminal fitting for introducing the plug-side insertion terminal; an insertion terminal inserted into the hole; Wherein the terminal fitting and the lead are connected to each other so that a relative pressing force can be freely generated between the terminal and the lead. 2. The insertion terminal of the plug can be freely expanded and contracted in the circumferential direction, and the diameter of the hole of the terminal fitting is smaller than that of the insertion terminal when the diameter is expanded, so that the distance between the hole and the contact terminal can be increased. 2. The structure for connecting a lead to a connection terminal of an electric device according to claim 1, wherein the relative pressure contact force can be freely generated by the method. 3. The hole of the terminal fitting is provided with a spring material on its inner peripheral surface to allow the insertion terminal of the plug to advance and retreat and press against the same. The diameter of the insertion terminal is made smaller than the diameter of the hole. 2. The structure for connecting a lead to a connection terminal portion of an electric device according to claim 1, wherein a relative pressure contact force can be freely generated between the portion and the insertion terminal.