SI9700143A - Device for the prevention of double or multiple attachment of electronic instrument - Google Patents

Abstract

The device for the prevention of a double or multiple attachment of electronic instruments features a damper (3) which is located under the frame (2) attached to the instrument chassis (1), while the terminal support is deepened and the upper frame (2) surface is practically on the same level as the chassis (1) surface. During normal use only one terminal field can be connected, the rest is covered by the damper (3). The option of a damper with window provides the access to one terminal area, while other fields (two or more) remain covered.

Description

DEVICE FOR PREVENTING DOUBLE OR MULTIPLE CONNECTORS OF ELECTRICAL INSTRUMENT

The field of technology

The invention falls within the field of technique for enclosures for electrical instruments. According to MPK, it belongs to class G 01R 1/04.

-2Technical problem

The invention solves the technical problem of constructing a device for preventing the double or multiple connection of an electrical instrument, which should be as simple and inexpensive as possible.

The state of the art

Multifunctional devices, in which there are several substantially different functions in a single casing, often have multiple terminal boxes, especially if the characteristics of the connectors are too inconsistent. In certain cases, the connection to these different fields must be realized in such a way that only one connection box is always accessible for safety or other reasons.

A typical example of the use of said device is a measuring instrument intended for measurements on a low-voltage electrical network, which also has a communication port for data transmission or has a special connector for measurements with mains voltage and another connector for measurements with an internal source. In both cases, the inside of the instrument is very likely to be at phase potential, which means that the simultaneous connection becomes dangerous due to the direct accessibility of the measured voltage and the possibility of a short circuit across the two terminals.

So far, the problem of preventing double tampering has been solved with an additional relay switching unit, which prevents simultaneous connection.

Description of the new solution

The essence of the new solution lies in the movable flap, located below the frame, which is attached to the instrument body.

The new solution will be described in more detail with the help of pictures showing:

Fig. 1 shows a cross-sectional view of a double-connector preventer; Fig. 2 shows a frame;

Figure 3 shows a recessed frame;

Figure 4 shows the hatch;

Fig. 5 shows a damper with a spring bulge;

Figure 6 shows an extension flap;

Fig. 7 shows a flap with pins;

Figure 8 shows connection boxes 9 and 10 (frame and flap removed);

Figure 9 shows connection boxes 14, 15, 16 and 17 (frame and flap removed);

Figure 10 shows a cross-sectional device without a frame;

11 shows a frame 23;

12 shows a flap 22;

-3Figure 13 shows connection boxes 11, 12 and 13 (frame and flap removed);

Figure 14 shows a device for preventing multiple cross-sectional connections.

The cross-section prevention device is shown in cross-section in Figure 1.

The flap 3 is located under the frame 2 and can be moved with the fingers sliding along the ribs 4 projecting from the box 1. The frame 2 is generally mounted in the box 1 of the device in such a way that the support of the connectors is deepened and the upper surface of the frame 2 is practically in the plane of the surface of the enclosure 1.

Flap 3 and frame 2 generally do not have mechanisms for holding flap 3 in the selected position. The terminal boxes 9 and 10 (Fig. 8) are so far apart that in normal use only one terminal box can be connected and no other can be connected at all.

The frame 2 itself is shown in detail in Figure 2 and the flap 3 in Figure 4. The frame 2 is attached to the housing 1 so that it cannot be removed without the use of tools. To reduce friction during movement, the flap 3 has projections 19. The flap 3 can be moved from one position to another with the finger and has fins 20 for better grip.

The flap 3 and the frame 2 can also be fitted with a restraint mechanism that holds the flap 3 in the selected position. This is done by a spring bulge 7 on the flap 3 (Figure 5) and a recess 6 on the frame 2 (Figure 3).

We can also go without the frame 2, it is only necessary to ensure that the flap 3 cannot be removed without the use of tools. Such a flap 3 is shown in Fig. 7. The flexible blades 8 (Fig. 7) prevent the flap 3 from falling out of the housing (Fig. 10) by locking it into the groove 24 but allowing the flap 3 to move.

For terminals 14, 15, 16 and 17 (Fig. 9), a flap 3 with extension 18 is provided (Fig. 6). In this case, flap 3 detects terminal boxes 14, 15 and 16, and conceals terminal box 17 and vice versa.

If three or more different positions of the flap are required, the embodiment shown in Figures 11 to 14 is used. The frame 23 has an opening that detects all connecting fields, and the flap 22 has an opening 21 that can detect a single connecting field 11, 12 or 13.

The flap 22 does not need ribs 8 because the edges of the opening 21 provide a gripping finger grip.

In an analogous manner, a device can be constructed that detects one terminal box and simultaneously covers more than two terminal fields.

The device according to the invention, in all its variants, allows the attachment of only one terminal box, all the other concealing, thereby preventing the connection to another field or fields, increasing the safety of the user and improving the protection of the device, as it physically disables the simultaneous unauthorized connection which could cause damage or damage. destruction of the device.

The device according to the invention is very efficient, but inexpensive.

Claims (7)

Claims: A device for preventing the double attachment of an electrical instrument, characterized in that the movable flap (3) is mounted below the frame (2), attached to the housing (1) of the instrument, the flap (3) being in a position which detects the connection box (1). 9) simultaneously covers the connection box (10) and vice versa. Apparatus according to claim 1, characterized in that the ribs (4) project from the housing (1) of the instrument. Apparatus according to claim 1 or 2, characterized in that the flap (3) has projections (19) and ribs (20). Device according to claim 1, 2 or 3, characterized in that the flap (3) has a spring protrusion (7) and the frame (2) has a recess (6). Device according to claim 1, 2, 3 or 4, characterized in that the flap (3) has an extension (18) and that the flap (3) is in a position that detects all three connecting fields (14), (15) and (16) simultaneously covers the connection box (17) and vice versa. Apparatus according to claim 1, 2, 3, 4 or 5, characterized in that it has no frame (2), the flap (3) has flexible blades (8) and the housing (1) of the instrument has a groove (24). Device for preventing multiple attachment of an electrical instrument, characterized in that it has a movable flap (22) mounted below the frame (23) attached to the housing (1) of the instrument, while being in the position of the flap (22) which is provided with an opening (21) detects one of the connecting boxes (11), (12) or (13) simultaneously covering the remaining two connecting boxes.