JPH0437641B2 - - Google Patents

Description

[Detailed description of the invention] [Technical field to which the invention pertains]

The present invention relates to a pantograph for a vehicle.

[Prior art and its problems]

It is desirable that the folding height of a vehicle pantograph be as low as possible in order to minimize the vehicle limit. As shown in Fig. 2, in the conventional pantograph, a frame body 6 supporting a boat body 5 is rotated vertically on parallel rotation shafts 4a and 4b supported by an underframe 3 fixed on the roof 1 of the vehicle via an insulator 2. is movably mounted and has axes 4a, 4
The shafts 4a and 4b are rotated in opposite directions as shown by the arrows by a lifting device consisting of a spring 8 stretched between the first levers 7a and 7b between the upper and lower ends of the shaft 6, and the frame 6 is pushed up to raise the boat body 5. As a lowering device, a piston rod 91 of a pneumatic cylinder 9 fixed to the underframe 3 is pin-coupled to one side 4a of the parallel rotating shaft via a second lever 10, and the cylinder frame 92 Air pipe 11 that sends compressed air to
are combined. 12 is a third lever that supports the pantograph so that it does not tilt in the direction of movement.
The shafts 4a and 4b are pin-coupled via pins 3a and 13b. When compressed air is sent into the cylinder 9 through the air pipe 11, the piston is pushed to the left and the shafts 4a and 4b rotate against the spring 8, causing the frame 6 to rotate.
The boat body 5 is lowered by folding. In the above structure, the pneumatic cylinder 9 combines the torques of the parallel rotation shafts 4a and 4b into one second lever 1.
Since the load is borne through 0, the piston stroke is short, the cylinder outer diameter is large, the underframe height _H2 is high, and the folded height H of the pantograph is therefore high.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned drawbacks and to provide a pantograph which has a small cylinder outer diameter and whose folded height can be reduced.

[Key points of the invention]

In the present invention, the lowering device is composed of the second lever fixedly disposed on each of the parallel rotation shafts, and a pneumatic cylinder disposed between the second levers, and one of the second levers and the piston rod of the pneumatic cylinder. The outer diameter of the cylinder is reduced by rotatably coupling the other end of the second lever and the frame of the pneumatic cylinder.

[Embodiments of the invention]

FIG. 1 shows a pantograph lowering device according to an embodiment of the present invention, and parts indicated by the same reference numerals as in FIG. 2 are the same parts. A second lever 15 is attached to each of the two parallel rotation shafts 4a and 4b that are pivotally supported on the underframe 3.
a, 15b are fixedly arranged, and the second levers 4a, 4
A pneumatic cylinder 14 is arranged in a horizontal position between the two sides. A piston rod 141 of the pneumatic cylinder 14 is rotatably connected to a pin at the tip of one second lever 15a. Pneumatic cylinder 14
The cylinder frame 142 is provided with a rod 16 extending to the opposite side of the piston rod 141, and the cylinder frame 142 is rotatably pin-coupled to the tip of the other second lever 15b via the rod 16. . Further, a flexible air pipe 17 that is extendable and retractable is coupled to the cylinder frame 142 . Although not shown, a guide rail may be provided on the underframe 3 to slidably guide the cylinder frame 142 in consideration of vibration impact and the like. In this configuration, when pressurized air is fed into the pneumatic cylinder 14 from the flexible air pipe 17, the piston rod 141 operates against the biasing force of the spring 8 (see FIG. 2), and the piston rod 141 moves to the left at the same time. The cylinder frame 142 moves to the right. Due to this movement, the piston rod 141 pushes the second lever 15a to rotate the parallel rotation shaft 4a clockwise, and at the same time, the cylinder frame 14 pushes the second lever 15b via the rod 16 to rotate the parallel rotation shaft 4b counterclockwise. rotate in the direction. Therefore, the frame 6 which was kept in the raised state by the spring 8 (see Fig. 2)
is folded up, and the hull 5 (see FIG. 2) is lowered. In this way, the torque of each of the two parallel rotating shafts is transmitted to the piston and cylinder frame of the pneumatic cylinder, so the torque applied to the cylinder piston is half of that of the conventional cylinder, and the stroke is doubled. If the cylinder torque is halved, the cylinder outer diameter will be 1/√
It can be made twice as small. Therefore, the height _H2 of the underframe and the folded height H of the pantograph can be reduced.

【Effect of the invention】

According to the present invention, the outer diameter of the pantograph lowering pneumatic cylinder can be made smaller, and the folded height of the pantograph can therefore be lowered, so that the economical effect of lowering the vehicle limit is great.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a schematic structure of a pantograph lowering device according to an embodiment of the present invention, and FIG. 2 is a sectional view showing a schematic structure of a pantograph having a conventional lowering device. 3: Underframe, 4a, 4b: Parallel rotation axis, 5: Hull, 6: Frame, 7a, 7b: First lever, 8: Spring, 10, 15a, 15b: Second lever, 9, 1
4: Pneumatic cylinder, 16: Rod, 17: Flexible air pipe, 141: Piston rod, 142: Cylinder frame.

Claims (1)

[Claims] 1. An underframe 3 provided on the roof of the vehicle, and two parallel rotation shafts 4a, 4 horizontally supported by the underframe 3.
b, a diamond-shaped foldable frame 6 whose lower ends are fixed to the parallel rotation shafts 4a and 4b, and the frame 6.
a current collecting hull 5 which is provided on the top of the frame body 6 and is pressed against the overhead wire as the frame body 6 expands; a lifting device which stretches the frame body 6 by the biasing force of a spring 8 and raises the hull 5; a lowering device that folds the frame 6 and lowers the hull 5 against the biasing force of a spring 8 of the raising device; The lowering device includes a second lever 10 fixed to the parallel rotation shafts 4a, 4b, and a second lever 10 fixed to the parallel rotation shafts 4a, 4b. 10, the second lever (15a, 15) has the lowering device fixed to each of the parallel rotation shafts 4a, 4b
b and the pneumatic cylinder 14 disposed between the second levers 15a, 15b, one of the second levers 15a, 15b and the piston rod 141 of the pneumatic cylinder 14 are rotatably coupled, Said second lever 1
5a, 15b and the frame 142 of the pneumatic cylinder 14 are rotatably connected to each other.