JPH0416764Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a pneumatic wiper device for a railway vehicle having an intermittent operation function.

[Conventional technology]

The conventional pneumatic wiper device for railway vehicles was
It is disclosed in Japanese Utility Model Publication No. 60-2030, Japanese Utility Model Publication No. 58-86955, and Japanese Utility Model Publication No. 58-37713. A conventional technique based on these is shown in FIG. 3 and will be explained below.

FIG. 3 shows a state in which the wiper arm 1 is at a stop position N. Further, pressurized air is supplied from the W port of the operating valve 2 set at the stop position to the A chamber of the drive cylinder 4 via the switching valve 3 set at the first position, and at the same time, the operating valve 2 It is also supplied from the P port to the stop piston chamber 6 of the lock cylinder 5 attached to the switching valve 3. Therefore, the switching valve 3 is locked at the first position shown, and the wiper arm 1 is stopped at the stop position N.

From this state, when the operating valve 2 is switched to the automatic position and the air in the stop piston chamber 6 is exhausted through the operating valve 2, the switching valve 3 is switched to the second position by the action of the first pilot passage 7. , pressurized air is supplied to chamber B of the drive cylinder 4. Accordingly, the first piston 8 and the second piston 9 of the drive cylinder 4 move rightward in the figure.

When the first piston 8 and the second piston 9 move to the right end, that is, when the wiper arm 1 comes to the reverse position M, the switching valve 3 is switched to the first position again by the action of the second pilot passage 10, and the pressure Air is supplied to chamber A of the drive cylinder 4. Thereafter, the same action is repeated, the first piston 8 and the second piston 9 of the drive cylinder 4 repeatedly perform a reversal operation to the left and right, and the wiper arm 1 swings left and right within the initially set angle range.

The operating speed or the number of operating times at this time is controlled by adjusting the throttle amount of a flow rate regulating valve 12 interposed in a passage 11 between the operation valve 2 and the switching valve 3.

Furthermore, when the operating valve 2 is switched to the manual position, both the drive cylinder 4 and the lock cylinder 5 are opened to the atmosphere. Therefore, by manually operating a handle (not shown) fixed to the drive shaft 20 of the wiper arm 1, the wiper arm 1 can be manually swung left and right.

In FIG. 3, 13 is an air source, 14 is a shutoff cock, 15 is a filter, 16 is an exhaust silencer, 17 is a rack connecting the first piston 8 and the second piston 9, and 18 is a drive shaft 20. The fixed pinion 19 is a wiper blade.

[Problem that the invention attempts to solve]

By the way, when the wiper device for a railway vehicle is activated, the wiper arm 1 and the wiper blade 19 cross the line of sight of the driver, and if this operation is repeated frequently, it becomes difficult to drive. Measures have been taken to reduce the number of swings of the blade 19. That is, by narrowing the internal passage of the flow rate regulating valve 12, the operating speed is slowed down.

However, as the flow rate adjustment valve 12 is narrowed down, the sliding resistance of each part to make the wiper arm 1 swing, the frictional resistance between the wiper blade 19 and the window glass, and the pressure air flow to the drive cylinder 4 are reduced. Since the balance with the supply amount deteriorates, the movement of the wiper blade 19 becomes jerky and difficult to move smoothly. Therefore, the operating speed cannot be reduced much, which has been an obstacle to improving the drivability of the driver.

This idea solves the above problems by stopping the operation for a certain period of time after the end of one stroke, while maintaining the operating speed that allows stable operating conditions, and then returning to stable operation. It is an object of the present invention to provide a pneumatic wiper device that can improve the drivability of a driver by performing intermittent operation of operating at an operating speed that provides a suitable condition.

[Means for solving problems]

The means taken by this invention to achieve the above object include, in addition to the basic configuration of the conventional pneumatic wiper device explained in FIG. 3, a solenoid valve is interposed between the operation valve and the lock cylinder. , this solenoid valve is a solenoid valve that supplies air to the lock cylinder when the coil is demagnetized and exhausts the lock cylinder when the coil is energized, and a detection switch that detects the reversed position of the wiper arm and turns it off, and an on-delay type. A first series circuit with a timer relay is provided, a delay time of the timer relay is set to be longer than a return movement time of the wiper arm, and a first series circuit is provided between the normally open timer contact of the timer relay and the coil of the solenoid valve. Two series circuits are connected in parallel to the first series circuit, and this parallel circuit is connected to a power source via an intermittent switch.

〔Example〕

FIG. 1 is a schematic diagram showing the pneumatic wiper device of this invention, and FIG. 2 is an explanatory diagram of the operation of the pneumatic wiper device of FIG. 1.

In FIG. 1, the drive cylinder 4 is connected to the rack 1.
The rack 17 has a built-in first piston 8 and a second piston 9 connected by a pin 7, and a pinion 18 fixed to a drive shaft 20, which is the center of swing of the wiper arm 1, is meshed with the rack 17. There is. The wiper blade 19 is attached to the tip of the wiper arm 1. The switching valve 3 is capable of switching between a first position and a second position, and also has a lock cylinder 5. And lock cylinder 5
When pressurized air is being supplied to the stop piston chamber 6, the switching valve 3 is set to the first position shown. The operating valve 2 can be switched to three positions: a stop position, an automatic position, and a manual position, and its W port is connected to the switching valve 3 through a passage 11, and its P port is connected to a lock cylinder 5 through a passage 22. The stop piston chamber 6 is connected to the stop piston chamber 6.

Passage 22 between operating valve 2 and lock cylinder 5
A solenoid valve 23 is interposed therein. This solenoid valve 2
3 is a two-position, three-port off-type solenoid valve,
When the coil 23a is in a demagnetized state, it is set to the air supply position shown in the figure, and when the coil 23a is in an excited state, it is set to the exhaust position.

24 is a first series circuit, and a detection switch 25 detects the reverse position M of the wiper arm 1 and turns it off.
A normally closed contact 25a and an on-delay type timer relay 26 are connected in series. As is clear from FIG. 2, the delay time t of the timer relay 26 is set longer than the return movement time S of the wiper arm 1.

27 is a second series circuit, which connects the normally open timer contact 26a of the timer relay 26 and the solenoid valve 23.
and the coil 23a are connected in series.

The first series circuit 24 and the second series circuit 27 are connected in parallel, and these circuits 24 and 27 are connected to a power source 29 via an intermittent switch 28.

Note that other constituent parts that are the same as those of the conventional example are given the same reference numerals as in FIG. 3, and the explanation thereof will be omitted.

Next, the operation will be explained with reference to FIGS. 1 and 2.

FIG. 1 shows the wiper arm 1 in a stop position N. At this time, the operating valve 2 is set at the stop position, and pressurized air is supplied from the P port of the operating valve 2 through the passage 22 and the electromagnetic valve 23 into the stop piston chamber 6 of the lock cylinder 5. At the same time, pressurized air flows from the W port of the operating valve 2 to the passage 1.
Air is supplied to the A chamber of the driving cylinder 4 through the switching valve 1 and the switching valve 3.

When the intermittent switch 28 is turned on from this state,
The timer relay 26 is activated, and the timer contact 26a is turned on after a set time (t seconds). As a result, the coil 23a is energized, the solenoid valve 23 is switched to the exhaust position, and the pressurized air in the stop piston chamber 6 is exhausted. In addition, in conjunction with this, the switching valve 3 is switched to the second position, pressurized air is supplied into the B chamber of the drive cylinder 4, and the pistons 8 and 9 move rightward. This movement is converted into a swinging motion of the wiper arm 1 by the rack 17 and pinion 18, and the wiper arm 1 swings to the left to the reverse position M.

When the wiper arm 1 reaches the reverse position M, the drive shaft 2
The detection switch 25 is operated by a detection lever (not shown) provided at 0, the normally closed contact 25a of the detection switch 25 is turned off, the timer contact 26a is turned off, and the coil 23a of the solenoid valve 23 is turned off.
is demagnetized. Therefore, the solenoid valve 23 is switched to the illustrated air supply position, and the switching valve 3 is also switched. Accordingly, the first piston 8 and the second piston 9 move to the left, and the wiper arm 1 swings to the right to come to the stop position N. Immediately after the return movement of the wiper arm 1 starts, the contact 25a of the detection switch 25 turns on, and the timer relay 26 starts counting again.
Repeat the above operation again after t seconds.

In this embodiment, the position of the wiper arm 1 is detected from the rotation angle of its drive shaft 20, and the timer relay 26 is activated based on the signal, so the wiper arm 1 stops after one cycle. This has the advantage that intermittent operation is reliably performed.

Note that when the operation valve 2 is switched to the manual position, both the drive cylinder 4 and the lock cylinder 5 are opened to the atmosphere, and the wiper arm 1 can be manually swung left and right by manually operating a handle (not shown). .

In addition, in the pneumatic wiper device shown in Fig. 1,
As shown by the imaginary line, when the operating valve 2 is set to the intermittent position, a switch 30 such as a limit switch detects this, and the intermittent switch 28 is activated by the detection signal.
may be configured so that it is turned on.

Furthermore, the lock cylinder 5 may be attached to the drive cylinder 4 instead of the switching valve 3 as shown in FIG. 2 of Japanese Utility Model Publication No. 58-37713.

Further, the drive cylinder 4 may be of a link mechanism rather than a rack and pinion type.

Further, the detection of the reversed position M of the wiper arm 1 may be performed by detecting the positions of the pistons 8 and 9 of the drive cylinder 4.

[Effect of idea]

As described above, according to the pneumatic wiper device of this invention, it is possible to reduce the number of operations while maintaining an operating speed that does not make the wiper arm jerky, thereby improving the operability of the driver. become.

By the way, in recent years, intermittent operation has become almost commonplace in electric wiper devices for automobiles.
In the case of a pneumatic wiper device such as the wiper device of this invention, there is no conventional wiper device capable of intermittent operation. Since a pneumatic wiper device can swing a larger wiper arm than an electric wiper device, it can be said that this invention, which enables intermittent operation of such a pneumatic wiper device, has a great practical effect. Further, this invention has the advantage that the configuration for performing intermittent operation is simple, such as the timer relay may be a single timer.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of a pneumatic wiper device according to an embodiment of this invention, FIG. 2 is an explanatory diagram of the operation of the wiper device of FIG. 1, and FIG. 3 is a schematic diagram of a conventional wiper device. DESCRIPTION OF SYMBOLS 1... Wiper arm, 2... Operation valve, 3... Switching valve, 4... Drive cylinder, 5... Lock cylinder, 23... Solenoid valve, 23a... Coil, 24...
...First series circuit, 25...Detection switch, 26...
...Timer relay, 26a...Timer contact, 27...
...Second series circuit, 28...Intermittent switch, 29...
...Power supply, N...Stop position, M...Reverse position.

Claims (1)

[Claims for Utility Model Registration] A drive cylinder that reciprocates a wiper arm between a stop position and a reverse position by supplying and discharging pressurized air; A switching valve that automatically switches supply and exhaust, a lock cylinder that holds the wiper arm at a stop position when pressurized air is supplied, and an operation valve that supplies pressurized air to the lock cylinder and the switching valve. In the pneumatic wiper device for a railway vehicle, a solenoid valve is interposed between the operation valve and the lock cylinder, the solenoid valve supplies air to the lock cylinder when the coil is demagnetized, and supplies air to the lock cylinder when the coil is energized. a solenoid valve for exhausting the wiper arm, a first series circuit consisting of a detection switch that detects the reverse position of the wiper arm and turns it off, and an on-delay type timer relay, and the delay time of the timer relay is used as the return movement of the wiper arm. A second series circuit consisting of the normally open timer contact of the timer relay and the coil of the solenoid valve is connected in parallel to the first series circuit, and this parallel circuit is connected to the power supply via an intermittent switch. A pneumatic wiper device for a railway vehicle, characterized in that the wiper device is connected to a pneumatic wiper device.