JPH09107603A - Pantograph - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a possibility that in the case of the folding operation of a pantograph, near the final stage thereof, the slid surface of its ceiling tube on its hook is damaged due to both its sliding friction and its long-term use, and its sliding friction is made so large that the folding operation becomes faulty, and to provide a pantograph wherein the stable engagement operation of its hook with its ceiling tube can be obtained over a long term. SOLUTION: A ball bearing 13 is provided in the engagement portion of a ceiling tube 5 with a hook 6. Also, at both the ends of the ball bearing 13, collars 14 are provided for them to be fastened to the ceiling tube 5. According to this configuration, since in the engagement portion of the ceiling tube 5 with the hook 6 the ball bearing 13 is used for the operation when the hook 6 is engaged with the ceiling tube 5 not to be performed by a sliding friction but to be performed by a rolling friction, the friction of the slid surface of the ceiling tube 5 on the hook 6 is so reduced that the stable engagement operation of the hook 6 with the ceiling tube 5 can be obtained over a long term.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pantograph for collecting electric power from an overhead line on an electric train in an electric railway.

[0002]

2. Description of the Related Art FIG. 3 is a side view showing a structure of a diamond-shaped frame of a general pantograph. In FIG. 3, a pantograph frame 4 has a current collecting boat 3 provided with a contact plate 2 which is in contact with an overhead line 11 and slides on the upper part thereof. The diamond-shaped framework 4 of the pantograph is composed of a lower frame 4A and an upper frame 4B.
The lower end of the lower frame 4A is fixed to a rotating shaft 4C attached to the underframe 10 via a bearing, and the center of rotation of the rotating shaft 4C is the underframe 1.
It is fixed to 0. The joint that connects the upper end of the lower frame 4A and the lower end of the upper frame 4B and the joint at the apex of the upper frame 4B are freely rotatable, and their positions are also freely movable.
Are provided concentrically with the joint at the apex of the upper frame 4B.

One end of the spring lever 16 is fixed to the rotary shaft 4C at a constant angle, and the main spring 1 is stretched over the other end of the spring lever 16. Due to the pulling force of the main spring 1, the lower frame 4A has a rotating shaft 4C.
A clockwise force is generated centering on the, and this force acts as an ascending force at the apex of the diamond-shaped framework to push up the framework 4, so that the sliding plate 2 comes into contact with the overhead wire 11 with an appropriate force. .

Further, high pressure air 1 is added to the pneumatic lowering cylinder 9.
By supplying 2, the framework 4 is lowered and folded. When the frame 4 descends, the ceiling pipe 5 near the final stage descends while sliding on the slope 6A on the upper surface of the hook 6, and finally engages with the lower surface of the hook 6 to hold it so that the frame 4 does not rise. There is. FIG. 2 is a structural diagram of a conventional example in which the ceiling pipe 5 is engaged with the lower surface of the hook 6.

The hook 6 is designed to rotate about a center 6B of its length as a fulcrum, and a return spring 8 urges the hook 6 in a direction to hook the hook 6 on the ceiling pipe 5. To remove the hook 6, high pressure air 12 is supplied to the hook cylinder 7, the piston of the hook cylinder 7 is pushed out, and the hook 6 is rotated clockwise.

[0006]

Since both the ceiling pipe 5 and the hook 6 are made of metal, the contact surfaces between the ceiling pipe 5 and the hook 6 will be damaged by sliding friction when used for a long period of time, and flash or burr will occur. , Or due to rust or the like caused by peeling of the plating, the ceiling pipe 5 and the hook 6 are caught on the sliding surface near the final stage of the folding operation of the framework 4 and the framework reaches the predetermined folding position. It may not descend. In order to prevent this, grease is applied to the sliding surface between the ceiling pipe 5 and the hook 6, but there is also a harmful effect such as dirt due to the adhesion of foreign matter, which requires regular maintenance work in a short period of time. is there.

Therefore, an object of the present invention is to provide a pantograph capable of obtaining a stable hooking operation for a long period of time.

[0008]

In order to achieve the above object, the present invention relates to a ceiling pipe provided at the top of a foldable rhomboidal frame and an engagement between the ceiling pipe at the folded position of the frame. In a pantograph having a hook that prevents the frame from rising, a rolling bearing is provided at a portion of the ceiling pipe that engages with the hook. Also, collars are provided at both ends of the rolling bearing, and this collar is fixed to the ceiling pipe.

According to the structure of the present invention, since the hooking portion of the ceiling pipe is a rolling bearing, the operation at the time of hooking is not sliding friction but rolling friction. Is smaller, and a stable hooking operation can be obtained.

[0010]

1 is a structural diagram showing an embodiment of the present invention. In FIG. 1, a rolling bearing 13 is provided in a portion of the ceiling pipe 5 that engages with the hook 6, and when the ceiling pipe 5 and the hook 6 engage with each other, the rolling bearing 13 rotates, so that in the conventional structure. Sliding friction is used as rolling friction to reduce the frictional resistance of the sliding surface between the ceiling pipe 5 and the hook 6.

The rolling bearing 13 is rotatably fitted on the outer periphery of the ceiling pipe 5, and the axial movement of the rolling bearing 13 is stopped by a collar 14. The collar 14 is fixed to the ceiling pipe 5 with a pin 15.

[0012]

According to the structure of the present invention, when the ceiling pipe and the hook are engaged with each other, the contact surface thereof causes rolling friction, so that the contact surface is rough, burr or burr, or the plating is peeled off. There is no risk of malfunction due to rust. Further, since it is not necessary to apply grease to the sliding surface between the ceiling pipe and the hook, the harmful effect caused by the adhesion of foreign matter is eliminated, and a stable hooking operation can be obtained for a long time.

[Brief description of the drawings]

FIG. 1 is a structural diagram showing an embodiment of the present invention.

FIG. 2 is a structural diagram of a conventional example in which a ceiling pipe is engaged with a lower surface of a hook.

FIG. 3 is a side view showing the configuration of a diamond-shaped framework of a general pantograph.

[Explanation of symbols] 5 Ceiling pipe 6 Hook 6A Sloping surface of hook 13 Rolling bearing 14 Color 15 pin

Claims (2)

[Claims] 1. A pantograph having a ceiling tube provided on a top portion of a foldable rhomboidal frame and a hook for engaging with the ceiling tube in a folded position of the frame to prevent the frame from rising. A pantograph comprising a rolling bearing at a portion engaging with a hook. 2. The pantograph according to claim 1, wherein collars are provided at both ends of the rolling bearing, and the collars are fixed to the ceiling pipe.