JPH0380957B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a safety device for electric vehicles, and particularly to a safety device for electric vehicles suitable for ensuring safety during maintenance and inspection work of high voltage equipment, etc. It is related to.

[Prior art]

Generally, electric vehicles use many high-voltage devices of 600 [V] or more, and when performing maintenance and inspection on these devices, for safety reasons, be sure to ground the circuit from the pantograph. must be in state. As shown in Fig. 1, safety devices for achieving this condition include a mechanism that disconnects the circuit from the pantograph 1 by operating the grounding switch 2 and also grounds the high-voltage equipment inside the vehicle. Some structures are known. Further, a master key 3 is attached to this ground switch 2. This master key 3
is interlocked with the operation of the grounding switch 2, and the grounding switch 2 is provided with a mechanism that allows the master key 3 to be removed only when the grounding switch 2 is set to the grounding position. Therefore, the interlock locks 8 of the high-voltage equipment frame doors 6 and 7 can be opened in a safe manner using the master key 3. However, in addition to the above-mentioned functions, the safety device also needs to have a function that prevents the grounding switch 2 from being operated unless all the high-voltage equipment frame doors 6 and 7 are closed. An interlock lock box 5 is provided to provide such a function. This interlock lock box has a sub key 4 for opening and closing the high voltage equipment frame doors 6 and 7.
The master key 3 is constructed with a mechanism such that the master key 3 cannot be removed unless all keys are stored in the interlock lock box 5. Therefore, the grounding switch 2 cannot be operated and power cannot be supplied from the pantograph 1.

Details of the above-mentioned interlock lock box 5 will be explained with reference to FIGS. 2 to 5.

In the figure, reference numeral 5 denotes an interlock lock box, and this lock box 5 has a handle 9 that is rotatable as shown by an arrow 100 and is attached to a shaft 10. This lock box 5 is provided with a master key hole 30 and a plurality of sub key holes 40 as shown in the figure. Further, the shaft 10 of the lock box 5 has a groove 10D into which the rotary seat 11 that rotates when the master key 3 is inserted through the master key hole 30 and rotated from A to B as shown by the arrow 101 is engaged. and subkey 4
A groove 10E is provided in which the rotating seat 12, which rotates when the key is inserted through the sub-key hole 40 and rotated from E to F as shown by arrow 102, is engaged.

The operation of this structure will be explained below.

First, when all the sub keys 4 are inserted into the interlock lock box 5 and the master key 3 is not inserted, the handle 9 cannot be rotated. Furthermore, since the sub-key 4 cannot be removed, the interlock locks 8 attached to the high-voltage equipment frame doors 6 and 7 cannot be opened, and therefore maintenance and inspection work on the high-voltage equipment cannot be performed.

Next, the ground switch 2 is grounded and the master key 3 is removed. Then, the master key 3 is inserted into the master key hole 30 of the interlock lock box 5 and rotated from A to B as shown by the arrow 101 in the figure.
As a result, the rotary seat 11 also rotates at the same time, and the rotary seat 11 is removed from the groove 10D of the shaft 10, allowing the shaft 10 to rotate and making it impossible to remove the master key 3 from the interlock lock box 5. Furthermore, the handle 9 is rotated from C to D as shown by arrow 100. This allows the subkey 4 to rotate. That is, this is because the rotary seat 12 engages in the groove 10E of the shaft 10. Therefore, by rotating the subkey 4 from E to F as shown by arrow 102, all of the plurality of subkeys 4 can be removed. As a result, the high voltage equipment frame doors 6 and 7 can be opened and maintenance and inspection work can be carried out safely. In addition, when removing the master key 3, the above-mentioned operation is performed in reverse.

As described above, the interlock lock box 5 requires many operations such as inserting and rotating the master key 3, rotating the handle 9, and rotating and removing the sub key 4, and also requires confirmation of each movement. This is because the state in which the shaft 10 is stopped mid-rotation cannot be visually observed, so if the key is operated without checking, the groove 10
D and 10E, and the rotating seats 11 and 12 will be damaged. In addition, the personal interlock lock box 5 has a handle 9 on the top, which increases the size of the interlock lock box 5 and requires space to operate the handle 9, which limits the installation direction. It was hot.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a safety device for an electric vehicle that eliminates the drawbacks of the prior art described above and facilitates the operability of the interlock device without compromising safety.

[Summary of the invention]

In order to achieve the above object, the present invention provides a plurality of high voltage devices connected to a pantograph via a grounding switch, a high voltage device door that partitions these high voltage devices, and a high voltage device door that separates the high voltage devices from the pantograph. A master key that can be removed from the grounding switch only when the high voltage equipment is disconnected and each of the high voltage equipment is grounded, a subkey that locks and unlocks each of the high voltage equipment doors, and all of these subkeys. A safety device for an electric vehicle, comprising an interlock device that allows rotation and removal of the master key when inserted and allows removal of the sub-key when the master key is inserted and rotated,
The lock operated by the master key and the sub-key of the interlock device is a cylinder lock, and the rotating part of the cylinder lock corresponding to each sub-key and the rotating part of the cylinder lock corresponding to the master key are They were connected by a connecting member.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described based on FIGS. 6 to 9.

FIG. 6 is a front view showing an embodiment of the interlock lock box according to the present invention, in which the master key can be removed. FIG. 7 is a sectional view of FIG. 6. FIG. 8 is a sectional view taken along the - line in FIG. 7. Further, FIG. 9 is a front view showing an embodiment of the present invention in which the master key cannot be removed.

In these figures, the interlock lockbox is constructed as follows.

That is, the master key passive mechanism section includes a master key cylinder lock 16, a lever 18 that is attached to the back side of the cylinder lock and rotates at the same time as the master key 14, and a pin 19 that is attached to the lever 18.
It is composed of. Further, the plurality of sub-key passive mechanisms are composed of a sub-key cylinder lock 17, a lever 21 attached to the back surface of the sub-key cylinder lock 17 and rotating in the same manner as the sub-key 15, and a pin 22 attached to the lever 21. The pin 19
The pins 22 are respectively engaged in grooves 20A and 20B bored in the slide plate 20 as a connecting member, and the slide plate 20 inserts the pins 23 implanted in the box 13 into the plate. It engages in a groove 20C drilled in 20 and is fixed so as to be movable up and down as shown in the figure. The above mechanism is housed in the box 13 except for the heads of the master key cylinder lock 16 and subkey cylinder lock 17, that is, the portions into which the master key 14 and subkey 15 are inserted.

The operation of the interlock lockbox constructed in this way will be explained.

In the interlock lock box with the sub key 15 not removed (FIG. 6), the master key 14 is inserted into the master key cylinder lock 16 and rotated from G to H as shown by arrow 200. As a result, when the lever 18 rotates as shown by the arrow 201, the pin 19 slides within the groove 20A of the slide plate 20, and the slide plate 20 moves into the pin 20A.
3 and the groove 20C as shown in the arrow 20.
It will move from L to M as in 2. Simultaneously with the above operation, the pin 22 engaged in the groove 20B of the slide plate 20 slides in the groove 20B and rotates from J to K as shown by arrow 203 in the figure. As a result, the lever 21 and the plurality of subkeys 15 also move in the same way. After the above operations are completed, the interlock lock box will look like the one shown in FIG. 9.

As described above, the master key 14 cannot be removed, but all the subkeys 15 can be removed instead.

According to this embodiment, the master key 14 and the subkey 15 are linked, and the subkey 15 can be removed only by operating the master key 14. In this way, the interlock mechanism is constructed by one operation, and the movement can be visually observed, so that the operation can be performed reliably. Also, according to this example,
Interlock lockboxes can be small,
It also has the advantage of requiring less installation space. Further, the conventional interlock lock box has a handle on the top, and therefore it is necessary to take some space to operate the handle, but according to this embodiment, it can be operated only from the front, and no space is required at the top. Therefore, it has the advantage that it can be installed in a push-in manner and does not obstruct passage in a passageway or the like.

〔Effect of the invention〕

As described above, the present invention has the advantage that safety is not compromised, interlock operation is a single operation step, and movement can be visually observed. Further, according to the present invention, there is an effect that the interlock lock box can be made smaller.

[Brief explanation of drawings]

Fig. 1 is a system diagram showing an overview of the safety device, Fig. 2 is a plan view of the conventional example, Fig. 3 is a front view of the conventional example, and Fig. 4 shows the conventional example, with the master key removed. Figure 5 is a cross-sectional view showing a conventional example where the master key cannot be removed and the sub-key is removable. A front view showing an embodiment of the invention in which the master key is removable and the sub-key is not removable, FIG. 7 is a sectional view of FIG. 6, and FIG. 8 is a sectional view taken along the line of FIG. 7. FIG. 9 is a front view showing an embodiment of the present invention in which the master key cannot be removed and the sub-keys can be removed. 1... Pantograph, 2... Ground switch, 3
... Master key, 4 ... Subkey, 5 ... Interlock lock box, 6, 7 ... High voltage equipment frame door, 9
... Handle, 13 ... Box, 14 ... Master key, 15 ... Sub key, 16 ... Cylinder lock for master key, 17 ... Cylinder lock for sub key, 18, 21 ... Lever, 19, 22, 23 ...
...Pin, 20...Slide plate body (connection member).

Claims (1)

[Claims] 1 A plurality of high voltage devices connected to the pantograph via a grounding switch, a high voltage device door that partitions these high voltage devices, and a connection between the pantograph and each of the high voltage devices is disconnected and each of the high voltage devices is grounded. a master key that can be removed from the grounding switch only when and an interlock device that allows the sub-key to be removed when the master key is inserted and rotated, the lock operated by the master key and the sub-key of the interlock device is What is claimed is: 1. A safety device for an electric vehicle, characterized in that the rotating portion of the cylinder lock corresponding to each of the sub-keys and the rotating portion of the cylinder lock corresponding to the master key are connected by a connecting member.