JPH0120775Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a short circuit method between a signal ground and a frame ground in office equipment, information processing equipment, etc.

In electronic equipment, signal ground (hereinafter referred to as
(hereinafter referred to as SG) and frame ground (hereinafter referred to as FG)
is shorted.

However, before assembling the equipment, turning on the power, and starting the test, it is important to check whether it is safe to turn on the power, and whether there is dangerous voltage on parts that the worker or operator will come into contact with due to leakage current, etc. In order to confirm safety, such as whether or not an occurrence has occurred, and to confirm the margin for safety, SG
Measure the insulation condition between and FG and perform a dielectric strength test.

In such a case, do not short-circuit between SG and FG.

For this reason, short-circuiting and
There is a demand for the emergence of something that can release short circuits.

[Conventional technology]

FIGS. 2 and 3 are perspective views showing a conventional short circuit method.

As shown in Figure 2, frame 1 and frame 1
Short-circuiting with the printed board 2 attached by fixing means (not shown) is performed by a short-circuiting piece 4 provided between terminals 3a and 3b attached to the frame 1.

That is, the terminals 3a and 3b are attached to the frame 1 through a base 6 made of an insulating material, centering on metal shafts 5a and 5b having screws cut thereon.

A knob 7 is screwed onto the shafts 5a and 5b that protrude outward from the frame 1, as shown by arrows A-B.
When it is rotated in a predetermined direction, the wire rod inserted between the stand 6 and the knob 7, or the shorting piece 4 as shown in the figure, is fixed.

The other ends of the shafts 5a and 5b protrude inside the frame 1, and one shaft 5a is connected to a terminal 8a provided in the frame 1 with a wire 9a,
The other shaft 5b is connected to a terminal 8b provided on the printed board 2 by a wire 9b.

In the above, terminal 3a on frame 1 side is FG
The terminal 3b on the printed board 2 side is the SG terminal.

In such a configuration, when short-circuiting the FG terminal 3a and the SG terminal 3b, a short-circuiting piece 4 as shown in the figure is generally used in addition to a normal wire.

The shorting piece 4 is made of a metal with low electrical resistance such as a copper plate or a brass plate, and has notches 4a at both ends, or a circular hole (not shown) at one end and a notch 4a at the other end.

Although Fig. 2 shows the state in which the short circuit has been released, in this example, the circular hole of the short circuit piece 4 is fitted to the shaft 5a of the FG terminal 3a, and the knob 7 is tightened to lock it. .

When short-circuiting under such conditions, FG
Loosen the knob 7 of the terminal 3a to make the shorting piece 4 rotatable, and rotate the shorting piece 4 in the direction of arrow C to open the notch 4a.
is engaged with the shaft 5b of the SG terminal 3b, and the knobs 7 of both terminals are tightened.

Next, referring to FIG. 3, the short circuit method in this example is to connect the terminal 8a provided on the frame 1'.
and the pattern 2a of the printed board 2' are soldered together using a wire 9c.

Therefore, in order to release the short circuit, one of the solders must be removed.

[Problem that the invention attempts to solve]

There are methods for shorting FG and SG as described above, but the method shown in Figure 2 requires terminals 3a and 3b, their installation, and wiring between the terminals, the frame, and the printed board, which is expensive. On the other hand, the method shown in Figure 3 is simple and inexpensive, but it requires a separate short-circuit and short-circuit release process in the manufacturing and testing processes, which has problems such as interfering with the work flow. .

[Means for solving problems]

The above-mentioned problem is that in a device consisting of a conductive frame and a printed board attached to the frame, a connecting means for connecting one end of a shorting piece to an end of the printed board near the frame. A short-circuiting member that is electrically connected to the signal ground line of the printed board is attached, and the connection means of the short-circuiting member is kept insulated from the frame and connected to the outside of the frame on the frame surface facing the short-circuiting member. A window that can be exposed to
This problem is solved by a short-circuiting mechanism configured such that it can be detachably attached to each of the above-mentioned connecting means at both ends of the frame via the frame.

[Effect]

That is, for example, a short-circuiting member provided with a screw hole is mounted on the end face of a printed board, and the printed board is fixed together with other mounted components by dip soldering, while a window is drilled in the frame through which the short-circuiting member is exposed. In the event of a short circuit, one end of the shorting piece is screwed to the shorting member through the window, and the other end is screwed to, for example, a screw hole provided in the frame to achieve the purpose.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG.

FIG. 1 is a perspective view of a short circuit mechanism according to the present invention. In the figure, 10 is a panel, 10a is a window, 1
1 is a printed board, 12 is a shorting member, 13 is a shorting piece, 13a is a circular hole, 14 is a screw, and 15 is a screw hole.

As shown in FIG. 1, panel 1 of printed board 11
A short-circuiting member 12 provided with a screw hole 15 is fixed to the end in contact with 0.

The short-circuit member 12 is mounted on the printed board 11 together with other components, and is simultaneously fixed to the printed board 11 by dip soldering.

On the other hand, the frame 10 is provided with a window 10a that exposes the shorting member 12 to the outside (left side in the figure) as shown in the figure.

The window 10a is provided sufficiently larger than the shorting member 12, so that the shorting member 12 does not come into contact with the edge of the window 10a.

Further, the frame 10 is provided with screw holes 15.

As shown in the figure, the shorting piece 13 is made of a metal with low electrical resistance, and circular holes 13a are provided at both ends thereof. Further, in order to provide flexibility, a bent portion 13b is provided in the central portion.

In a device having such a configuration, in order to short-circuit the short-circuit member 12 (SG) of the printed board 11 and the frame 10 (FG), the short-circuit piece 13 is brought into contact with both the short-circuit member 12 and the frame 10. The two screws 14 are screwed into the respective screw holes 15 through the circular holes 13a, and are tightened and fixed.

In this case, even if there is a slight difference in level between the fastening member 12 and the frame 10, or even if there is a slight error in the pitch of the screw holes 15, the bent portion 13 of the fastening piece 13
Since b absorbs these, there is no problem.

[Effect of idea]

As explained above, by applying the short-circuiting mechanism of the present invention to a device, the structure becomes simple and the cost can be reduced, and short-circuiting and short-circuiting can be easily performed. It has become possible to easily conduct insulation tests, voltage resistance tests, etc. anywhere.

[Brief explanation of the drawing]

Figure 1 is a perspective view of the short circuit mechanism according to the present invention, Figure 2 is a perspective view of the short circuit mechanism according to the present invention;
3 and 3 are perspective views showing a conventional short-circuiting method. In the figure, 10 is a panel, 10a is a window, 11
is a printed board, 12 is a shorting member, 13 is a shorting piece,
13a is a circular hole, 14 is a screw, and 15 is a screw hole.

Claims (1)

[Claims for Utility Model Registration] In a device comprising a conductive frame and a printed board attached to the frame, one end of a shorting piece is connected to an end of the printed board close to the frame. A shorting member is attached to the frame surface facing the shorting member, and the connecting means of the shorting member is connected to the frame while maintaining insulation from the frame. A window that can be exposed to the outside of the frame and a connecting means connected to the other end of the shorting piece are formed, and the shorting piece is configured to be detachable at both ends thereof via the frame by the respective connecting means. A short-circuit mechanism characterized by: