JPH085079Y2 - Wiper switch automatic stop device - Google Patents

Description

TECHNICAL FIELD The present invention relates to an automatic stop device for a wiper switch.

2. Description of the Related Art Conventionally, as described in Japanese Utility Model Laid-Open No. 59-7521, the wiper motor is rotated at high speed or low speed by selectively pressing the first or second sliding operation body (push button). There is a push button switch device for motor operation that is adapted to do so.
This one requires a normally closed switch and a normally open switch for every two sliding operation bodies (first and second push buttons).

Such a device is designed to keep the sliding operation bodies alternately in the interlocked state by interlocking with the operation of one of the two sliding operation bodies for circuit switching which are selectively pushed, and to perform the sliding operation for resetting. A multiple linked switch operating mechanism that restores the sliding operating body for circuit switching by pushing the body is required. Hereinafter, FIGS. 2 and 3 show a conventional example of the structure of the multiple interlocking switch operating mechanism A and the wiper drive circuit 15. Two sliding operation bodies 2 and 3 for switching a circuit and a sliding operation body 1 for resetting are slidably provided by being biased in one direction by a spring 4. A knob 5, which is a pressing operation portion, is provided on the upper end surfaces of these sliding operation bodies 1, 2, and 3, and projections 6 and 7 are formed on the side surfaces so as to project. Further, the slider 8 facing the ends of the protrusions 6 and 7 on the opposite side of the knob 5 has the sliding operation body 1,
The spring 9 is biased by a spring 9 in one direction orthogonal to the sliding direction of the second and third sliding parts, and a stopper 10 limits the sliding range of the spring 9 so that the sliding is possible. The slider 8 is formed with locking edges 12 and 13 that engage with the side surfaces 11 of the protrusions 6 and 7, and are engaged when the sliding operation bodies 1, 2 and 3 are slid against the urging force thereof. An inclined portion 14 is formed on the side surface 11 of each of the protrusions 6 and 7 so as to incline in the direction in which a component force that presses the tongue 12 or 13 and presses the slider 8 against its biasing force is generated. The locking edge 12 is formed on one edge of the slider 8, while the other locking edge 13 is formed on one edge of the opening 8a formed in the intermediate portion of the slider 8. The above is the structure of the multiple interlocking switch operation mechanism A.

Next, FIG. 3 shows the wiper drive circuit 15. That is, the ignition switch 17 connected to the power supply 16 includes the fixed contact 18a of the low speed switch 18 and the high speed switch 1.
Nine fixed contacts 19a are connected in parallel, and low speed switch 18
The other fixed contact 18b is connected to the low speed field coil 21 of the wiper motor 20, and the other fixed contact 19b of the high speed switch 19 is connected to the high speed field coil 22 of the wiper motor 20. Further, the movable contact 18c of the low speed switch 18 is held by the sliding operation body 2, and the high speed switch 1
The movable contact 19c of 9 is held by the sliding operation piece 3.

The wiper motor 20 described above is for transmitting the rotational movement in one direction to a wiper blade (not shown) of an automobile by a link mechanism (not shown) to reciprocally rotate the wiper blade within a certain range. . Along with this, a series circuit 24 is formed by the power supply 16, the automatic stop switch 23, the switches 27 and 28, and the low-speed field coil 21 of the wiper motor 20. These switches 27 and 28 are fixed contacts 27a and 27b or fixed contacts 28a and 28b and movable contact 27, respectively.
Although it has c or 28c, the movable contact 27c is held by the sliding operation piece 2 and the movable contact 28c is held by the sliding operation piece 3. Further, the automatic stop switch 23 detects the position of the wiper blade described above and is always on when the wiper blade is in a position other than the predetermined starting position, and is turned off when the wiper blade reaches the starting position. belongs to. This is because even if the low speed or high speed switches 18 and 19 are cut off at any time during the driving of the wiper blade, the wiper blade is moved to the predetermined starting position without stopping in the middle of the rotation range and then stopped. This is to allow it.

Next, the operation will be described. First of all, sliding operation elements 1, 2,
The operation of 3 will be described. When the sliding operation body 2 or 3 is pressed, the slanted portion 14 of the projecting portion 7 and the locking edge 13 come into contact with each other, and the component force generated from this abutting force causes the slider 8 to slide to the right against the force of the spring 9. When the upper surface of the protrusion 7 moves under the locking edge 13, the slider 8 is returned to the left by the biasing force of the spring 9. Thereby, the locking edge of the slider 8
13 presses the upper surface of the protrusion 7 and maintains the sliding operation body 2 or 3 in the pressed state. Therefore, when the sliding operation bodies 2 and 3 are alternately pushed, when one is pushed, the other is repeatedly returned to the upper direction by the restoring force of the spring 4. Since only the protrusion 6 of the sliding operation piece 1 is long, its upper surface does not reach below the slider 8. That is, when the sliding operation bodies 2 and 3 for switching for opening and closing the wiper drive circuit 15 are all restored, the sliding operation body 1 for reset is pressed.

Next, the opening / closing operation of the wiper drive circuit 15 will be described. In the state shown by the solid line in FIGS. 2 and 3, the two sliding operation bodies 2 and 3 are in the returning state due to the pressing force of the spring 4,
The low speed and high speed switches 18 and 19 are kept off, and the switches 27 and 28 are kept on. However, because the automatic stop switch 23 is kept off, the wiper motor
20 is not driven. As described above, when the sliding operation piece 2 is pressed, the movable contact 18c, which was in contact only with the fixed contact 18b, also comes into contact with the fixed contact 18a, the low speed switch 18 is switched on, and the fixed contacts 27a, 27b are turned on. The movable contact 27c that was in contact with both is separated from the fixed contact 27b, and the swish 27 is switched off. Also, when the sliding operation piece 3 is pressed, the movable contact 19c, which was in contact with only the fixed contact 19b, changes to the fixed contact 19b.
The high speed switch 19 was switched on by contacting a as well, and the movable contact 27c that was in contact with both the fixed contacts 28a and 28b
Is separated from the fixed contact 27b and the switch 28 is turned off.

This operation will be described with reference to the circuit of FIG. 3. When the low speed switch 18 is turned on, the switch 27 is turned off and the power supply 16
The series circuit of the low speed switch 18 and the low speed field coil 21 is closed, and the wiper motor 20 is driven at a low speed. Also, when the high-speed switch 19 is turned on, the switch
28 is turned off, the series circuit of the power supply 16, the high speed switch 19 and the high speed field coil 22 is closed, and the wiper motor 20 is driven at high speed. When the sliding operation body 1 for resetting is operated and the low speed or high speed switches 18 and 19 are turned off, the switches 27 and 28 are switched on. At this time, when the wiper blade is not in the starting position, the automatic operation is performed. Since the stop switch 23 is in the ON state, the voltage from the power supply 16 is transmitted through the switches 28 and 27 to the low speed field coil 21.
Is applied to the wiper motor 20 to move the wiper blade, and when the wiper blade reaches the starting position, the automatic stop switch 23 is turned off and the wiper motor 20 and the power supply 16 are disconnected. .

Problems to be Solved by the Invention Thus, when the low speed or high speed switches 18 and 19 are turned off during driving of the wiper blade, the switches 27 and 27 connected in series between the power supply 16 and the wiper motor 20. 2
Need to turn on 8. However, the low-speed switch 18 or the high-speed switch 19 is attached to the sliding operation bodies 2 and 3 for switching the circuit.
The movable contact 18c or 19c for opening and closing the switch must be provided and the movable contact 27c or 28c for opening and closing the switch 27 or 28 must be incorporated. These moving contacts 18
Each of c, 19c, 27c and 28c needs to be elastically held by being urged to one side by a spring (not shown), which complicates the structure and complicates the assembling work. further,
There is a problem in that the sliding operation bodies 2 and 3 become large, and a margin for the entire arrangement space must be allowed. In addition, the power
Automatic stop switch in series circuit of 16 and wiper motor 20
In addition to 23, multiple switches 27 and 28 must be connected,
Therefore, if one of the plurality of switches 27, 28 fails, the wiper blade cannot be returned to the starting position, and there is a problem of lack of reliability. The one described in Japanese Utility Model Laid-Open No. 59-7521 has the same problem because of the large number of switches.

Means for Solving the Problem A low-speed field coil of a wiper motor is connected to a power source via a low-speed switch, and a high-speed field coil is connected to the power source via a high-speed switch,
An automatic stop switch, which detects the return operation of the wiper blade connected to the wiper motor to the starting position and closes at a position other than this starting position, is connected between the wiper motor and the power source and selectively pushed. The sliding operation bodies are alternately maintained in the interlocked state in conjunction with the operation of one of the two circuit switching swing operation bodies, and the circuit switching is performed in conjunction with the pushing operation of the reset sliding operation body. Is provided with a conductive interlocking switch operating mechanism for returning the interlocking operating body, and one opening and closing unit for opening and closing the low speed switch or the high speed switch is provided for each of the circuit switching slides. A switch made up of the slider and a fixed contact that comes into contact with the slider is connected in the series circuit of the wiper motor, the automatic stop switch, and the power supply provided on the moving operation body. It was.

Action When one of the sliding operation bodies for circuit switching is pressed, the two sliding operation bodies for circuit switching are maintained in the pushed state by the slider that interlocks with this pushing operation, and the low-speed or high-speed switch alternates. It is switched on and the wiper motor is driven at low speed or high speed. In addition, by pressing the sliding operation body for reset, the sliding operation body for circuit switching is restored, and the low speed switch and the high speed switch are switched off.
On the other hand, the conductive slider contacts the fixed contact except when the sliding operation body is pushed in. In this case, since the automatic stop switch is on when the wiper blade is not in the starting position, the power supply and the wiper motor are connected to drive the wiper blade, and when the wiper blade reaches the starting position, the automatic stop switch is automatically activated. A stop switch disconnects between the wiper motor and the power supply.

Embodiment An embodiment of the present invention will be described with reference to FIG. Second
The same parts as those described in FIGS. 3 and 4 are designated by the same reference numerals and the description thereof will be omitted. The sliding operation body 2 for switching one circuit holds only the movable contact 18c, which is one opening / closing portion that constantly elastically contacts the fixed contact 18b of the low speed switch 18, and the sliding operation body 2 for switching the other circuit. The sliding operation piece 3 holds only the movable contact 19c, which is one opening / closing portion that constantly elastically contacts the fixed contact 19b of the high-speed switch 19. Then, the power supply 16, the automatic stop switch 23, and the wiper motor
In a series circuit 24 connecting 20 low speed field coils 21 (or high speed field coils 22), a switch 26 including a part of the metal slider 8 and a fixed contact 25 that contacts the same is connected. . Further, when the sliding operation bodies 2 and 3 are pushed in, they are engaged with the locking edge 13 of the slider 8 and engage a part of the slider 8 on the upper portion of the projection 7 of the sliding operation bodies 2 and 3. A step portion 7a is formed to separate from the fixed contact 25.

In such a structure, as described above, the slider 8 moves to the right due to the contact between the protrusions 6 and 7 and the locking edges 12 and 13 no matter which of the sliding operation bodies 1, 2 and 3 is pressed. If the sliding operation body 2 or 3 for sliding the circuit is pushed before the sliding, the sliding operation body 2 or 3 is prompted to return when sliding to the right, and the spring 9 The sliding operation body 2 or 3 for circuit switching pressed by the return operation of the slider to the left based on the force is locked. As a result, by pressing any one of the circuit switching sliding operation bodies 2 or 3, the low speed or high speed switches 18 and 19 are alternately switched on. At this time, due to the contact between the stepped portion 7a of the sliding operation piece 2 or 3 and the locking edge 13, the return operation of the slider 8 is limited and a gap is formed between the fixed contact 25. That is, the switch 26 is kept off. This allows the wiper motor
20 is driven at low speed or high speed. Further, when the sliding operation body 1 for resetting is pressed, the sliding operation body 2 or 3 for circuit switching is restored and the low speed and high speed switches 18 or 19 are switched off. On the other hand, the sliding operation body The return operation of the second and third causes the engagement between the engagement edge 13 and the step portion 7a to be released, and the spring 9 returns to the position where the metal slider 8 comes into contact with the fixed contact 25. In this case, if the wiper blade is located at a position other than the starting position, the automatic stop switch 23 is on, the wiper motor 20 is rotated to drive the wiper blade, and the automatic stop switch 23 is activated when the wiper blade reaches the starting position. The power is turned off and the power supply 16 and the wiper motor 20 are disconnected.

As described above, the switch 26 connected in the series circuit 24 of the power supply 16, the automatic stop switch 23, and the wiper motor 20 is formed only by bringing the fixed contact 25 into contact with the existing slider 8. Movable contact 18a incorporating bodies 2, 3 or
It is possible to reduce the number of parts 19a to one, which can reduce the number of parts and simplify the assembling work.

Although the slider 8 is made of a metal material, it may be made of another conductive material. Further, at least a part of the slider 8 facing the fixed contact 25 may be made of a conductive material.

Since the present invention is configured as described above, a low speed or high speed switch is operated by operating the reset sliding operation member while the wiper motor is being driven to restore the circuit switching sliding operation member. When turning off, the switch that closes the series circuit of the power supply, automatic stop switch and wiper motor,
It can be formed by an existing slider and fixed contacts, and by doing so, it is possible to reduce the number of circuit switching parts incorporated in the sliding operation body for circuit switching and simplify the assembly work. The sliding operation body for circuit switching can be reduced in size to downsize the entire structure, and the reliability of operation control of the wiper motor can be improved.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention, a side view and a circuit diagram with a part in section, FIG. 2 is a side view showing a conventional example with a part in section, and FIG. 3 is a circuit diagram thereof. Is. A ... Multiple linked switch operating mechanism, 1 ... Sliding operating body for resetting, 2, 3 ... Sliding operating body for circuit switching, 8 ... Slider, 16 ... Power supply, 18 ... Low speed switch, 18a ... Opening / closing section , 19
… High-speed switch, 19a… Opening / closing part, 20… Wiper motor, 21… Low-speed field coil, 22… High-speed field coil, 23… Automatic stop switch, 24… Series circuit, 25…
Fixed contact, 26 ... Switch

Claims (1)

[Scope of utility model registration request] 1. A wiper blade connected to the wiper motor, wherein a low speed field coil of a wiper motor is connected to a power source via a low speed switch and a high speed field coil is connected to the power source via a high speed switch. Of the return operation to the starting position is detected, and an automatic stop switch that is closed at a position other than the starting position is connected between the wiper motor and the power source to selectively swing two circuit switching operations. These sliding operation bodies are alternately maintained in the pushed state in association with one movement of the body, and the sliding operation body for circuit switching is restored in conjunction with the pushing operation of the reset sliding operation body. A multiple interlocking switch operating mechanism including a conductive slider is provided, and one opening and closing unit for opening and closing the low speed switch or the high speed switch is provided. A wiper provided on a switching sliding operation body, and a switch comprising a slider and a fixed contact in contact with the slider is connected in a series circuit of the wiper motor, the automatic stop switch, and the power source. Switch automatic stop device.