JP7586772B2 - Locking mechanism for inspection cover of control unit box for railway vehicles - Google Patents

Description

The present invention relates to a locking mechanism for an inspection cover of a control device box for railway vehicles, in which an inspection cover is attached to close an opening formed on one side of the control device box for railway vehicles that stores electronic components and is suspended under the floor of the railway vehicle.

Conventionally, in the case of a railway vehicle control device box as exemplified in Patent Document 1, an inspection cover is generally attached so that it is removed from an opening on one side when inspecting the stored electronic components, and that the opening is normally closed. That is, a hook receiver is provided in the upper part of the opening on the side, and a locking portion is provided in the lower part of the opening on the side. The inspection cover is also provided with a hook at its upper end that is hooked onto the hook receiver, and a claw piece is provided at its lower end that is rotated by an operating lever and locks onto the locking portion except when the electronic components are being inspected.

The inspection cover is attached to one side of the railroad vehicle control device box so as to close the opening by hanging the hook of the inspection cover on the hook of the railroad vehicle control device box, and then rotating the claw piece with the operating lever to engage the claw piece with the engaging portion of the railroad vehicle control device box.

The inspection cover is attached to the railway vehicle control box so that it does not fall off while the railway vehicle is in motion. However, if an electronic component (such as a capacitor) stored in the railway vehicle control box were to burst or explode for some reason, the internal pressure of the railway vehicle control box would increase, and there is a risk that the inspection cover would fall off unexpectedly.

Japanese Patent Application Publication No. 10-278784

In view of the above, the present invention aims to provide a locking mechanism for an inspection cover of a railway vehicle control device box that can prevent an inspection cover attached to close an opening formed on one side of the railway vehicle control device box from falling off the railway vehicle control device box even if the internal pressure of the railway vehicle control device box increases due to the rupture or explosion of electronic components stored in the railway vehicle control device box.

In order to solve the above problem, the present invention provides a locking mechanism for an inspection cover of a railway vehicle control device box, in which an inspection cover is attached so as to close an opening formed on one side of a railway vehicle control device box that stores electronic components and is suspended under the floor of a railway vehicle, and in which the normal direction of the one side is defined as the X-axis direction, and within the X-axis direction, the direction from the one side toward the inside of the railway vehicle control device box is defined as the X-axis minus direction, and the direction from the one side toward the outside of the railway vehicle control device box is defined as the X-axis plus direction. The railway vehicle control device box has a hook attached to the upper part of the opening on the one side. A hook receiver is provided, and a locking portion is provided at the lower part of the opening on the one side, and the inspection cover has a hook at the upper end that is hooked onto the hook receiver, and a claw piece is provided at the lower end that is rotated by an operating lever and locks into the locking portion except when inspecting electronic components, and a lock key that protrudes in the negative X-axis direction is provided on the claw piece, and a lock key receiver is provided on the bottom wall inside the railway vehicle control device box, and when the claw piece is locked into the locking portion, the lock key can engage with the lock key receiver from the negative X-axis direction.

According to the present invention, when the claw is engaged with the engagement portion, even if electronic components stored in the railway vehicle control device box burst or explode, causing the internal pressure of the railway vehicle control device box to increase, the lock key engages with the lock receiver from the negative X-axis direction, preventing the inspection cover from falling off the railway vehicle control device box.

In the present invention, the lock key includes a first bar extending from the claw in the negative X-axis direction and a second bar that is bent at the tip of the first bar located opposite the claw, and the lock key receiver is located in the vicinity of the opening of the bottom wall of the control device box for railway vehicles and includes a vertical bar erected on the bottom wall and a horizontal bar that is bent at the upper end of the vertical bar and extends in a direction perpendicular to the X-axis direction. When the claw is rotated to a position where it is engaged with the engagement part, it is desirable that the first bar of the lock key is inserted below the horizontal bar from the tip side of the horizontal bar located opposite the vertical bar of the lock key receiver, and the second bar of the lock key is positioned in the negative X-axis direction and faces upward from the horizontal bar of the lock key receiver, so that the lock key can engage with the lock key receiver with the claw engaged with the engagement part. This not only simplifies the structure of the lock key and the lock key receiver, but also allows the lock key to be easily moved to a position where it can engage with the lock receiver by rotating the claw with the operating lever. In addition, the lock key can be easily disengaged from the lock key receiver by using the operating lever to rotate the claw in the direction opposite to the direction in which the lock key can engage with the lock key receiver.

1 is a side view illustrating a railway vehicle control device equipped with a locking mechanism for an inspection cover of a railway vehicle control device box according to the present invention; 1 is a side view of a main portion showing an embodiment of a locking mechanism for an inspection cover of a control device box for a railway vehicle according to the present invention; FIG. 3 is an enlarged side view of an elliptical portion B shown in FIG. 2 . 3A is a side view specifically showing a part of the locking mechanism of the inspection cover of the railway vehicle control device box shown in FIG. 2 with the claw piece engaged with the engagement portion, (b) is a view seen from the C direction of (a), and (c) is a view showing (a) from the X-axis negative direction to the X-axis positive direction. 3 is a side view of a main part of the locking mechanism of the inspection cover of the railway vehicle control device box shown in FIG. 2 when an electronic device stored in the railway vehicle control device box ruptures or explodes, causing the internal pressure to increase.

Referring to FIG. 1, the railroad vehicle control device A, which is suspended under the floor of the railroad vehicle, has two railroad vehicle control device boxes CB equipped with a locking mechanism for the inspection cover, which will be described later.

Referring to Figures 2 and 3, an opening 2 is formed on one side 1 of the railroad vehicle control device box CB (for example, the side located on the outside in the car width direction when the railroad vehicle control device A is suspended under the floor of the railroad vehicle in the car length direction). The opening 2 is provided so that an operator can inspect the electronic components stored in the railroad vehicle control device box CB through this opening.

In the following, this embodiment will be described assuming that the normal direction of one side surface 1 is the X-axis direction, the direction from one side surface 1 toward the inside of the railway vehicle control device box CB is the X-axis negative direction, and the direction from one side surface 1 toward the outside of the railway vehicle control device box CB is the X-axis positive direction.

An inspection cover 3 is attached to the railroad vehicle control device box CB so as to close the opening 2. For this purpose, the railroad vehicle control device box CB is provided with a hook receiver 4 at the upper part of the opening 2 and a locking portion 5 at the lower part of the opening 2. The hook receiver 4 has a circular shape when viewed from the side. The locking portion 5 is composed of a protrusion 51 that extends in the positive direction of the X-axis from the lower edge of the opening 2, and an angle 52 that rises from a portion of the bottom wall 6 located immediately adjacent to the opening 2 of the railroad vehicle control device box CB, bends in the positive direction of the X-axis, and extends to the portion of the protrusion 51 on the positive side of the X-axis, and is fixed by welding or the like.

The inspection cover 3 is provided with a hook 7 at its upper end to be hooked onto the hook receiver 4, and a claw 9 that is rotated by the operating lever 8 shown in FIG. 1 and is engaged with the engagement portion 5 except when inspecting electronic components. The hook 7 extends in a direction perpendicular to the X-axis direction, bends in the X-axis positive direction halfway from the lower end to the upper end, and has an arc-shaped upper end so as to be engaged with the hook receiver 4. As shown in FIG. 3, the upper end of the claw 9 is fastened by a nut 12 via a spring washer 11 to the end of the rotating shaft 10 on the X-axis negative side to which one end of the operating lever 8 is connected. Therefore, the claw 9 rotates in the same direction as the rotating direction of the operating lever 8. The rotating shaft 10 penetrates the lower end of the inspection cover 3 in the X-axis direction, and is supported rotatably by being fitted into a bearing 13 fixed to the lower end of the inspection cover 3. The hook 7 and the claw 9 are provided at each of the two ends of the inspection cover 3 perpendicular to the X-axis direction.

The inspection cover 3 also has handles 14 between each hook 7 and each pivot shaft 10 that extend in a direction perpendicular to the X-axis direction and that can be grasped by an inspector when installing and removing the inspection cover 3.

Next, the locking mechanism of the inspection cover 3 of this embodiment will be described in more detail with reference to Figures 4(a), (b), and (c). When the claw 9 is engaged with the engagement portion 5 shown in Figures 2 and 3, the operating lever 8 faces in a direction perpendicular to the X-axis direction. A circular arc-shaped notch 91 equivalent to a quarter circumference is formed in the upper end of the claw 9 on the side opposite the operating lever 8. In addition, the bearing 13 is provided with a rod-shaped stopper 15 that protrudes in the negative X-axis direction on the side opposite the operating lever 8.

Two ends 92 at the bottom of the claw 9, perpendicular to the X-axis direction, are bent in the negative X-axis direction, and the bottom of the claw 9 is tapered by the ends 92. The presence of the ends 92 allows the bottom of the claw 92 to smoothly contact the angle 52 of the locking part 5 when the operating lever 8 is rotated. The bottom of the claw 9 that comes into contact with the angle 52 receives the biasing force of the spring washer 11 and abuts against the angle 52, locking it to the locking part 5. The ends 92 also contribute to smoothly releasing the bottom of the claw 9 from the locking part 5.

When the rotation shaft 10 is rotated 90° in a direction perpendicular to the X-axis direction from the state where the hook 9 is engaged by the engaging portion 5 as shown in Figures 4(a), (b), and (c), the surface located on the notch 91 side of the upper end of the hook 9 abuts the upper surface of the stopper 15, and the operating lever 8 faces upward as shown in Figure 1. At this time, the hook 9 faces a direction perpendicular to the X-axis direction, and the engagement by the engaging portion 5 is released. In this state where the hook 9 is released from the engagement, the worker can grasp the handle 14 and rotate the inspection cover 3 in the positive direction of the X-axis direction around the hook receiver 4 to open the opening 2. In some cases, the hook 7 can be removed from the hook receiver 4, and the inspection cover 3 can be removed from the railroad vehicle control device box CB. In this way, the worker can inspect the electronic devices stored in the railroad vehicle control device box CB.

As shown in Figures 2 and 3, a packing 16 can be provided on the outer peripheral end of the inspection cover 3 to improve watertightness when the opening 2 of the railroad vehicle control device box CB is closed by the inspection cover 3. Similarly, a packing 17 can be provided on the outer peripheral end of the opening 2 of the railroad vehicle control device box CB. For example, the outer peripheral end of the inspection cover 3 presses against the packing 17, and at the same time, the protrusion 51 of the railroad vehicle control device box CB presses against the packing 16, so that the inspection cover 3 is in close contact with one side 1 of the railroad vehicle control device box CB. In this way, the watertightness of the opening 2 of the railroad vehicle control device box CB is improved when the inspection cover 3 is closed by the inspection cover 3.

In this embodiment, as shown in Figures 2, 3, and 4, the claw 9 is provided with a lock key 18 that protrudes in the negative X-axis direction, and a lock key receiver 19 is provided on the bottom wall 6 inside the railroad vehicle control device box CB. Specifically, the lock key 18 includes a first bar 181 that extends from the claw 9 in the negative X-axis direction, and a second bar 182 that extends after bending 90 degrees at the tip of the first bar 181 located on the opposite side to the claw 9. The lock key receiver 19 is located near the opening 2 of the bottom wall 6 inside the railroad vehicle control device box CB, and includes a vertical bar 191 that stands on the bottom wall 6, and a horizontal bar 192 that is bent 90 degrees at the upper end of the vertical bar 191 and extends in a direction perpendicular to the X-axis direction.

In the locking mechanism of the inspection cover 3 equipped with such a lock key 18 and lock key receiver 19, when the operating lever 8 is operated to rotate the claw 9 to a position where it is locked to the locking portion 5, the first bar 181 of the lock key 18 is inserted from the tip side of the horizontal bar 192 located opposite the vertical bar 191 of the lock key receiver 19 to the bottom of the horizontal bar 192. At the same time, the second bar 182 of the lock key 18 is positioned in the negative X-axis direction from the horizontal bar 192 of the lock key receiver 19 and faces upward. Therefore, when the claw 9 is locked to the locking portion 5, the lock key 18 can engage with the lock key receiver 19. In other words, if an electronic component such as a capacitor stored in the railroad vehicle control device box CB bursts or explodes for some reason and the internal pressure of the railroad vehicle control device box CB increases, the inspection cover 3 is subjected to a force that pushes it in the positive X-axis direction. At this time, the second bar 182 of the lock key 18 engages with the horizontal bar 192 of the lock key receiver 19, and this engagement prevents the inspection cover 3 from being pushed out in the positive direction of the X-axis. Therefore, even if the hook 7 or the inspection cover 3 itself is deformed, the lock key 18 engages with the lock key receiver 19 from the negative direction of the X-axis, preventing the inspection cover 3 from falling off the railway vehicle control device box CB.

In addition, in this embodiment, not only is the structure of the lock key 18 and the lock key receiver 19 simple, but the lock key 18 can be easily moved to a position where it can engage with the lock receiver 20 by rotating the claw piece 9 with the operating lever 8. In addition, by using the operating lever 8 to rotate the claw piece 9 in the direction opposite to the direction in which the lock key 18 can engage with the lock key receiver 19, the lock key 18 can be easily disengaged from the lock key receiver 19.

Although the embodiment of the present invention has been described above with reference to the drawings, the present invention is not limited thereto. For example, the locking mechanism of the inspection cover 3 of the control device box CB for railway vehicles is not limited to the control device A for railway vehicles suspended under the floor of the railway vehicle, but can be applied to all devices equipped with a control device box CB for railway vehicles that stores electronic components. In addition, various configurations and structures are possible for the hook receiver 4, hook 7, claw piece 9, and locking portion 5. For example, each end 92 of the lower end of the claw piece 9 can be arranged on the same plane as other parts without being bent in the negative X-axis direction. Furthermore, the configurations and structures of the lock key 18 and the lock key receiver 19 are not particularly limited to the embodiment, and any configuration and structure that allows the lock key 18 to engage with the lock key receiver 19 from the negative X-axis direction can be adopted.

CB...railroad vehicle control device box, 1...one side, 2...opening, 3...inspection cover, 4...hook receiver, 5...latching portion, 6...bottom wall, 7...hook, 8...operating lever, 9...claw piece, 18...lock key, 181...first bar, 182...second bar, 19...lock key receiver, 191...vertical bar, 192...horizontal bar.

Claims (2)

A locking mechanism for an inspection cover of a control device box for a railway vehicle, the control device box storing electronic components and hung under a floor of a railway vehicle, the inspection cover being attached so as to close an opening formed on one side of the control device box, the locking mechanism comprising:
A normal direction of the one side surface is defined as an X-axis direction, and within the X-axis direction, a direction from the one side surface toward the inside of the railroad vehicle control device box is defined as an X-axis minus direction, and a direction from the one side surface toward the outside of the railroad vehicle control device box is defined as an X-axis plus direction.
The railroad vehicle control device box is provided with a hook receiver at an upper portion of the opening on the one side surface, and a locking portion at a lower portion of the opening on the one side surface,
The inspection cover has a hook at an upper end portion thereof for engaging with the hook receiver, and has a claw at a lower end portion thereof which is rotated by an operating lever and is engaged with the engaging portion except when inspecting electronic components,
A locking mechanism for an inspection cover of a railway vehicle control device box, characterized in that a lock key protruding in the negative direction of the X-axis is provided on the claw, a lock key receiver is provided on the bottom wall of the railway vehicle control device box, and when the claw is engaged with the engagement portion, the lock key can engage with the lock key receiver from the negative direction of the X-axis. The lock key includes a first bar extending from the claw in the negative direction of the X-axis, and a second bar extending from a tip end of the first bar located on the opposite side to the claw, the second bar being bent and extending from the tip end of the first bar.
the lock key receiver is located in the vicinity of the opening of the bottom wall of the control device box for railway vehicles, and includes a vertical bar erected on the bottom wall, and a horizontal bar bent at an upper end of the vertical bar and extending in a direction perpendicular to the X-axis direction,
2. The locking mechanism for an inspection cover of a railway vehicle control device as described in claim 1, characterized in that, when the claw piece is rotated to a position where it is engaged with the engaging portion, a first bar of the lock key is inserted under the horizontal bar located opposite the vertical bar of the lock key receiver from the tip side of the horizontal bar, and a second bar of the lock key is positioned in the negative direction of the X-axis further than the horizontal bar of the lock key receiver and faces upward, so that the lock key can engage with the lock key receiver with the claw piece engaged with the engaging portion.

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