JPH0623966Y2 - Circuit meter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a circuit meter for measuring the continuity, resistance, current, voltage, etc. of an electric circuit or other object to be measured.

[Prior Art] A circuit meter is usually formed in a box shape, and accommodates an instrument, a printed circuit board, a battery, a range changeover switch, and the like, and has a scale plate or a digital display unit, a dial scale, and a changeover switch knob on the surface. There are two terminal holes for inserting the power switch and the lead wire of the test rod, etc., and the range for the measurement is set by turning the changeover switch with the knob, and the lead of the test rod separately prepared. The wires are inserted into the terminal holes, the test pins are brought into contact with both ends of the measured portion, and the pointers or the numbers on the digital display are read.

[Problems to be solved by the invention] In the above-mentioned circuit meter, the test rod to which the lead wire is connected is prepared separately from the circuit meter, and it is stored in the bag or bag before use. This is not only inconvenient, but it is often forgotten or lost because the user has to carry it with the circuit meter. In addition, in each measurement, the lead wire must be checked for positive and negative polarities and inserted into the terminals of the circuit meter, which is troublesome.

The present invention has been made to solve the above problems,
By integrating a test rod to which a lead wire is connected and a circuit meter, it is an object to obtain a circuit meter that eliminates the inconvenience of storage, carrying, and use.

[Means for Solving the Problems] A circuit meter according to the present invention includes a flat case in which a printed circuit board, a panel, a range selector switch, etc. are accommodated and one end of a lead wire is connected to the printed circuit board, a top plate and legs. And a flat cover, which is fixed to the inner wall of the lead reel and has a flat cover provided with two sets of protrusions on the side of the lead reel, is opened and closed, and is orthogonal to the length direction. A flat pair having an engaging hole that engages with a protruding portion of the cover, and inserting the lead wire into a through hole provided in the longitudinal direction and connecting the other end to a test pin fixed to the end. So that the lead wire can be wound around a lead reel so that the engagement hole provided in the test rod is engaged with the protrusion provided in the cover to hold the test rod in the cover. It is configured in.

[Operation] The lead wire is wound around the lead reel by hand, and the engagement hole provided on the test rod is engaged with and held by the protrusion provided on the cover. When the cover is closed, everything including the lead wire is in the housing. The circuit meter is compact and has a flat surface.

[Embodiment] FIG. 1 is a perspective view of an embodiment of the housing according to the present invention, FIG. 2 is a plan view of the embodiment of the present invention showing a state in which the cover of the housing is opened, and FIG. 3 is an exploded perspective view thereof. In this embodiment, an example in which the present invention is applied to a digital circuit meter is shown.

In the figure, 1 is a housing, 11 is its case, 12 is case 11
Is a cover integrally connected via a thin portion, and projections 13, 17 to 18a are provided on the inner surface. 2 is a wiring pattern, a large number of electronic parts, a conductive pattern 21 of a changeover switch,
It is a printed circuit board having a digital display unit 24 and the like. Reference numeral 3 denotes a panel, which is a mounting portion for a solar cell 39 for charging a built-in battery
31, a mounting portion 32 for the dial 4 of the changeover switch and the like are provided. 5 is a display window 51 of the digital display 24, a solar cell 39
2 is a front surface panel provided with a window 52, an arcuate cutout 53 aligned with a part of the outer circumference of the dial 4 of the changeover switch, and the like. 6 is a lead reel coupled to the protrusion 13 of the cover 12 of the housing 1;
The other end is a lead wire connected to each of the test pins 71, 71a.

In the circuit meter configured as described above, the present invention has a feature of the structure for storing the test rod and the lead wire in the circuit meter. Therefore, this will be described below.

FIG. 4 is a plan view showing a state in which the cover 12 is opened, and FIG. 5 is an AA enlarged sectional view thereof. In this embodiment, the protrusion 13 is composed of six protrusions protruding from the cover 12, and the protrusions 15, 14,
15a and 14a, 15b, 14b are arranged side by side with a slight gap, and the protrusions 14, 14a, 14b respectively have locking portions protruding outward.
16 is provided and is formed higher than the other protrusions 15, 15a and 15b.

FIG. 6 shows an embodiment of the lead reel 6, which is a top plate 61.
And a fitting portion 62 provided on the back surface, and is formed in a T-shape in cross section. The top surface of the top plate 61 is provided with a symbol (arrow) indicating the winding direction of the lead wires 72, 72a. . The fitting portion 62 is formed in the shape of a box that opens downward, and the inner width W ₂ thereof is the width W ₁ of the protrusion 13 of the cover 12, and the inner length L ₂ thereof is the length L _{1 of the} protrusion 13. The side wall has an engaging hole with which the engaging portion 16 of the high protrusion 14, 14a, 14b of the cover 12 engages.
64 are provided. Note that the drawings do not show engagement holes with which the projections 14a and 14b are engaged.

FIG. 7 shows an embodiment of the test rods 7 and 7a. 73
Is a flat support member having a substantially rectangular cross section, a through hole 74 through which the lead wire 72 is inserted is provided in the longitudinal direction, and a mounting portion 75 for the test pin 71 is provided at the tip end portion. 76,7
Reference numeral 6a is an engagement hole that engages with the protrusions 17, 17a, 18, 18a provided on the cover 12 of the housing 1.

Referring again to FIGS. 1 to 3, an example of the assembling order of the circuit meter according to the present invention will be described. First, the solar cell 39 on the panel 3,
Printed circuit board 2 by incorporating dial 4 etc. of changeover switch
And the front panel 5 are mounted thereon.
On the other hand, the fitting portion 62 of the lead reel 6 is fitted to the projection 13 provided on the cover 12, and the locking portions 16 of the projections 14 to 14b are engaged with the locking holes 64 to integrally couple the two. Next, one end is connected to the terminals 25, 25a of the printed board 2 or the lead wires 72, 72a are taken out from the cutouts 33, 33a provided in the panel 3, and fitted from between the top plate 61 of the lead reel 6 and the cover 12. Manually wrap it around the joint 62 and insert the engaging holes 76, 76a of the test rod 7, 7a into the protrusion of the cover 12.
Test rod 7, 17a and 18, 18a, respectively
The 7a and the lead wires 72, 72a are stored in the cover 12, and the state shown in FIG. 2 is obtained.

To measure the electrical characteristics of the DUT, turn the dial 4 and set it to the desired rage, and cover the test rods 7 and 7a.
12 protrusions 17, 17a and 18, 18a and lead wires 72, 7
2a is manually rewound from the lead reel 6 and the test pins 71, 71a
Is brought into contact with the object to be measured and measured. When the measurement is completed, turn off the power circuit, manually wind the lead wires 72, 72a around the lead reel 6, and engage the engagement holes 76, 76a of the test rods 7, 7a with the protrusions 17-18a of the cover 12. When the cover 12 is closed, all the test rods 7 and 7a and the lead wires 72 and 72a are accommodated in the housing 1, and the circuit meter becomes a compact box with no uneven surface.

In the above description, the present invention is applied to a digital circuit meter, but it can also be applied to an analog circuit meter. Further, when the lead reel is attached, the case where the protrusion is formed on the cover of the housing and the fitting portion for fitting to the lead reel is provided is shown, but the combination of the two is not limited to this. Alternatively, various modifications can be made, for example, by omitting the protrusion of the cover and providing legs on the lead reel and adhering to the cover with an adhesive. Further, the storage means for the test rod is not limited to the above embodiment, but can be changed as appropriate.

Further, although the case and the cover are integrally connected via the thin portion, the both may be separately formed and may be detachably connected.

[Effects of the Invention] As is apparent from the above description, according to the present invention, the test rod including the lead wire is housed in the housing when not in use, and one end of the lead wire is connected to the printed circuit board during use. Since the test rod can be taken out from the housing, it is not only extremely easy to operate, but there is absolutely no risk of forgetting or powdering the test rod, and it is also convenient to carry and is extremely effective in practical use. Is.

[Brief description of drawings]

FIG. 1 is a perspective view showing the appearance of a circuit meter according to the present invention, and FIG.
FIG. 4 is a plan view showing the state in which the cover is opened, FIG. 3 is an exploded perspective view of the embodiment of the present invention, FIG. 4 is a plan view in the embodiment of the housing showing the state in which the cover is open, and FIG. FIG. 6 is an enlarged sectional view taken along the line AA, showing an embodiment of the lead reel.
(a) is a plan view, (b) is its BB sectional view, (c) is a rear view,
FIG. 7 shows an embodiment of the test rod. (A) is a plan view, (b) is a side view, (c) is a bottom view, (d) is a cross-sectional view of the tip portion, and (e) is ( a) It is CC sectional drawing of a figure. 1: housing, 11: case, 12: cover, 13, 17-18a: protrusion, 2: printed circuit board, 3: panel, 4: dial,
5: front panel, 6: lead reel, 62: fitting part, 7,
7a: test rod, 71, 71a: test pin, 72, 72a: lead wire.

Claims (1)

[Scope of utility model registration request] 1. A flat case in which a printed circuit board, a panel, a range selector switch, etc. are accommodated and one end of a lead wire is connected to the printed circuit board, and a leg portion of a lead reel composed of a top plate and a leg portion is fixed to an inner wall. 2 on the side of the lead reel
A case in which a flat cover provided with a pair of protrusions is openably and closably coupled, and an engagement hole that is orthogonal to the length direction and engages with the protrusions of the cover, and extends in the length direction. A pair of flat test rods, each of which is formed by inserting the lead wire into the through hole provided and connecting the other end to a test pin fixed to the end, and winding the lead wire around a lead reel to form a test rod. A circuit meter characterized in that an engaging hole provided is engaged with a protrusion provided on the cover so that the test rod can be held in the cover.