JPH0743905Y2 - Wiper switch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Field of the Invention The present invention includes three changeover switches corresponding to switching positions of intermittent drive, low speed drive, and high speed drive, and a variable resistor that changes a drive interval of a wiper motor during intermittent drive, The present invention relates to a wiper switch having a washer switch that selectively ejects a washer liquid.

2. Description of the Related Art First, the operation of the wiper motor drive circuit W will be described with reference to FIG. This FIG. 3 shows a state in which the wiper switch is turned off. Now, when the wiper switch is switched to the intermittent drive (hereinafter referred to as INT) position, the changeover switch SW ₁ is turned on, the relay switch SW ₄ is changed over to the contact a side, and the voltage from the power supply 30 is changed over to the relay switch SW ₁ and the relay. It is supplied to the wiper motor 31 via the contact a of the switch SW ₄ and the relay switch SW ₅ . As a result, when the wiper blade (not shown) is operated, the auto stop switch SW ₆ built in the wiper motor 31 is switched to the contact a side. As a result, the voltage of the power supply 30 passes through the contact a of the auto stop switch SW ₆ and the variable resistor Re, and the
Applied to the base of r ₁ , transistor Tr ₁ turns on,
Since the base voltage of transistor Tr ₂ drops, it turns off,
Along with this, the relay switch SW ₄ returns to the contact b side. That is, the voltage of the power supply 30 is the auto stop switch.
Is applied to the wiper motor 31 via the contact a of the contact b and the relay switch SW ₆ of the contacts a and the relay switch SW ₄ of SW _6. When the wiper blade reciprocates once, the auto stop switch SW ₆ returns to the contact b side, so that the power supply to the wiper motor 31 is cut off, and the voltage stored in the capacitor C is gradually discharged by the time constant circuit including the variable resistance Re. Then, the transistor Tr ₁ turns off because the base voltage drops, and on the other hand, the transistor Tr ₂ turns on because the base voltage rises, and the relay switch SW ₄
Switches to the contact a side. This series of operations is repeated until the changeover switch SW ₁ is turned off. The frequency at which the wiper motor 31 is intermittently driven can be selected by changing the resistance value of the variable resistor Re.

When the wiper switch is switched to the low speed drive (hereinafter referred to as LO) position, the changeover switches SW ₁ and SW ₂ are turned on, the relay switch SW ₄ is changed over to the contact a side, and the voltage of the power supply 30 is changed over to the changeover switch SW ₁ Via the contact a of the relay switch SW _{4 and} the contact a of the relay switch SW ₅
Continuously, the wiper motor 31 rotates at a low speed.

When the wiper switch is switched to the high-speed drive (hereinafter referred to as HI) position, the changeover switches SW ₁ , SW ₂ , and SW ₃ are turned on, the relay switch SW ₄ is switched to the contact a side, and the relay switch SW ₅ is contacted. Switching to the b side, the voltage of the power supply 30 is continuously supplied to the wiper motor 31 via the contact a of the changeover switch SW ₁ , the relay switch SW _{4 and} the contact b of the relay switch SW ₅ , and the wiper motor 31 rotates at high speed. To do.

Next, the structure of the wiper switch is shown in FIG. In the figure, reference numeral 32 denotes a case, and an operation shaft 35 having a knob 33 at one end is urged toward the knob 33 side and fitted in the case 32 so as to be slidable and rotatable in the axial direction. Further, the case 32 is provided with a terminal base 36 and a rotor 38 having a contact plate 37. The terminal base 36 and the rotor 38 form changeover switches SW ₁ , SW ₂ , SW ₃ (see FIG. 3) for selecting the switching position of INT, LO, HI of the operating shaft 35. In addition, a board 39 which holds a large number of electronic circuit elements (not shown) and constitutes a control unit is provided at the end of the case 32, and the board 39 is provided at the tip of the operation shaft 35 in the axial direction. A variable resistor 40 having a shaft 34 which is slidably fitted and prevented from rotating in the rotation direction is fitted, and contact plates 42 and 43 connected to a washer drive circuit (not shown) are provided. ing. Furthermore, the operating shaft 35 has contact plates 42, 43.
A conducting portion 41 that contacts the. Variable resistance
40 functions in the same way as shown by Re in FIG.

Therefore, when the knob 33 is rotated in the rotation direction, the rotor 38
Rotate integrally, and you can select each position of INT, LO, HI. Further, in the rotation range of INT, the resistance value of the variable resistor 40 changes due to the rotation of the shaft 34. Further, when the knob 33 is pressed and the operation shaft 35 is slid in the axial direction, the contact plates 42 and 43 are connected by the conducting portion 41, whereby the washer drive circuit is driven and the washer liquid is ejected.

Problems to be solved by the invention A washer switch including a variable resistor 40 that changes the resistance value to select the drive frequency of the wiper motor at the INT position, contact plates 42 and 43 for opening and closing the washer drive circuit, and a conducting portion 41. Is provided on the substrate 39 separate from the changeover switch for selecting each of INT, LO, and HI positions, so that the depth dimension of the case 32 becomes long and the number of parts increases.

Means for Solving the Problem An operation shaft having a knob at one end is slidably held in an axial direction and is rotatably held in each of an OFF position, an intermittent drive position, a low speed drive position, and a high speed drive position. A case is provided, the rotor is fixed to the operation shaft in the rotation direction and is slidably fitted in the axial direction, and a first terminal base facing the rotor is fixedly provided inside the case,
A movable body biased to the knob side is provided in the case so as to be movable along the axis of the operation shaft, and a second terminal base facing the movable body at a predetermined interval is provided inside the case. Fixed to the rotor, four contact plates are arranged on one surface of the rotor, are connected to a wiper motor drive circuit, and each of the three contact sets forms a changeover switch together with the contact plate of the rotor, and three variable contacts. A set of resistance films forming a resistance is arranged on one surface of the first terminal base on the rotor side, and a contact plate is provided on one surface of the movable body, and is connected to a washer drive circuit and connected to the movable body. A pair of contacts forming a washer switch together with the contact plate is arranged on one surface of the second terminal base, and a pressing portion facing the one surface of the movable body is provided on the operation shaft.

The contact plate held by the rotor that rotates with the operating shaft and the contacts of the first terminal base form three changeover switches that select the switching position between INT, LO, and HI, and the rotor contact plate A variable resistance can be formed by the resistance film of the first terminal base and the contact plate of the second terminal base and the contact plate held by the movable body pressed by the pressing portion of the operation shaft. A washer switch that opens and closes the washer drive circuit can be formed, and a contact for forming a washer switch by forming a contact for a changeover switch and a resistance film for a variable resistance on the same plane of the first terminal base. Is formed on the flat surface of the second terminal base, and the movable body for holding the contact plate is formed in a plate shape, thereby making it possible to reduce the thickness of the case. Structure of a variable resistor and a washer switch can be extremely simplified.

Embodiment An embodiment of the present invention will be described with reference to FIGS. The operation of the wiper motor drive circuit W is the same as that described above, so the same reference numerals are used and description thereof is omitted. Reference numeral 1 denotes a case. An operation shaft 3 having a knob 2 fixed to the tip thereof is fitted to the case 1 so as to be slidable and rotatable in the axial direction by being urged in the direction of the knob 2 by a spring 4. Further, the rotor 5, the first terminal base 6, the plate-shaped movable body 7, and the second terminal base 8 are housed in the case 1. Further, on the outer side of the case 1, locking holes 11 and 12 for engaging with locking claws 9 and 10 formed on the peripheral edges of the first and second terminal bases 6 and 8 are formed.

Next, a conductive switching pattern 13 and resistance films 14 and 15 are formed on the first terminal base 6. The switching pattern 13 includes a plurality of arc-shaped contacts 16, 17, 18, 19, located on different radii from the center of the first terminal base 6.
Composed of 20. Although not shown, the rotor 5 includes a contact plate that contacts the contacts 16 and 17, a contact plate that contacts the contacts 18 and 19, and a contact plate that contacts the contact plates 16 and 20.
A contact plate that contacts the resistance films 14 and 15 is provided. Referring to FIG. 3, the changeover switch SW ₁ has contacts 16 and 17.
And a contact plate of the rotor, one contact 16 is connected to the power source 30, and the other contact 17 is connected to the transistor Tr ₂ via the coil of the relay switch SW ₄ . The changeover switch SW ₂ is formed by the contacts 18 and 19 and the contact plate of the rotor 5, and these contacts 18 and 19 are connected to the collector and the emitter of the transistor Tr ₂ . Further, the changeover switch SW ₃ is formed by the contacts 16 and 20 and the contact plate of the rotor 5, one contact 16 is connected to the power source 30, and the other contact 20 is connected to the coil of the relay switch SW ₅ . . Further, the second terminal base 8 is formed with annular contacts 21 and 22 connected to a washer drive circuit (not shown), and the back surface of the movable body 7 contacts these contacts 21 and 22. A contact plate (not shown) is held. The contact plate and the contacts 21 and 22 form a washer switch SW ₇ , and these contacts 21 and 22 are connected to the washer drive circuit. A wire harness is used to connect the changeover switches SW ₁ , SW ₂ , SW ₃ and the washer switch SW ₇ to the wiper motor drive circuit W or the washer drive circuit. The movable body 7 is biased by a spring 23 in a direction away from the second terminal base 8. Further, the movable body 7 is applied to the operation shaft 3 against the urging force of the spring 23.
Deformed shaft portion 25 having a pressing portion 24 at one end for pressing in the axial direction
Are formed. A deformed hole 26 slidably fitted in the deformed shaft portion 25 is formed at the center of the rotor 5, and the deformed shaft portion is formed at the center of the first terminal base 6.
An opening 27 for loosely fitting 25 is formed, and circular holes 28, 29 loosely fitted to the tip of the operation shaft 3 are formed at the centers of the movable body 7 and the second terminal base 8.

In such a structure, when the knob 2 is rotated, the operation shaft 3 is rotated together with the rotor 5. In the INT rotation position,
The contact plate of the rotor 5 connects the contacts 16 and 17, and the changeover switch S
W ₁ is turned on, and the other contact plates come into contact with the resistance films 14 and 15. I
The rotation range of NT is approximately 90 °, and as the rotation angle increases, the lengths of the resistance films 14 and 15 to be connected become longer and the resistance value of the variable resistance Re increases. Furthermore, when knob 2 is turned to the LO position,
The contact plate is removed from the resistance films 14 and 15, the contacts 16 and 17 are kept connected by the contact plate, the contacts 18 and 19 are connected by the contact plate, and the changeover switches SW ₁ and SW ₂ are kept ON. It
Further, when the knob 2 is rotated to the HI position, the contact plate newly contacts the contacts 16 and 20, and the changeover switch SW ₃ is turned on. As described above, the wiper motor 31 is intermittently driven at the INT position, continuously driven at the low position at the LO position, and continuously driven at the high speed at the HI position, as described above. Also,
Regardless of the position of the knob 2, when the knob 2 is pushed, the operation shaft 3 moves in the axial direction, and the pushing portion 24 pushes the movable body 7. As a result, the contact plate held by the movable body 7 becomes
1,2 are connected and the washer drive circuit is driven. When the knob 2 is released, the movable body 7 is separated from the contacts 21 and 22 together with the contact plate by the urging force of the spring 23, and the washer drive circuit is stopped.

As described above, the contacts 16 for the changeover switches SW ₁ , SW ₂ , and SW ₃ ,
17, 18, 19, 20 and the resistance films 14, 15 for the variable resistance Re are formed on the same plane of the first terminal base 6, and the contacts 21, 22 of the washer switch SW ₇ are formed on the second terminal base 8. Since the movable body 7 for holding the contact plate is formed into a flat surface, the case 1 can be made thin, and the structure of the variable resistor Re and the washer switch SW ₇ is extremely simplified. be able to.

Effect of the Invention As described above, the present invention holds the operation shaft having the knob at one end slidably in the axial direction and rotates to the OFF position, the intermittent drive position, the low speed drive position, and the high speed drive position. A case that holds freely is provided, and the rotor is fixed to the operation shaft so that it does not rotate in the rotation direction and is slidable in the axial direction, and the first terminal base facing the rotor is fixed inside the case. And a second terminal base facing the movable body with a predetermined space provided between the movable body and the movable body urged toward the knob so as to be movable along the axis of the operation shaft. It is fixedly provided inside the case, and four contact plates are arranged and arranged on one surface of the rotor, are connected to a wiper motor drive circuit, and form a changeover switch together with the contact plates of the rotor. Three sets of contacts In addition, a set of resistance films forming a variable resistance is arranged on one surface of the first terminal base on the rotor side, and a contact plate is provided on one surface of the movable body, and is connected to a washer drive circuit and is movable. By arranging a pair of contacts forming a washer switch together with the contact plate of the body on one surface of the second terminal base and providing a pressing portion facing the one surface of the movable body on the operation shaft, an operation is performed. INT, LO, and H are provided by the contact plate held by the rotor that rotates with the shaft and the contact of the first terminal base.
A variable resistance can be formed by the contact plate of the rotor and the resistance film of the first terminal base while forming three changeover switches for selecting the switching position with I, and the contact point of the second terminal base. A washer switch that opens and closes the washer drive circuit can be formed by the contact plate held by the movable body that is pressed by the pressing portion of the operation shaft, and further, the contact for the changeover switch and the resistance film for the variable resistance. And are formed on the same plane of the first terminal base, the contacts forming the washer switch are formed on the flat surface of the second terminal base, and the movable body holding the contact plate is formed in a plate shape. The case can be made thinner, which allows more flexibility in the layout of the mounting parts on the vehicle's instrument panel. This has the effect that the structure of the variable resistor and the washer switch can be extremely simplified.

[Brief description of drawings]

1 to 3 show an embodiment of the present invention.
1 is an exploded perspective view, FIG. 2 is a plan view of a first terminal base, FIG. 3 is a wiper motor drive circuit diagram, and FIG. 4 is a vertical sectional side view of a conventional wiper switch. 1 ... Case, 2 ... Knob, 3 ... Operation axis, 5 ... Rotor, 6 ...
The first terminal base, 7 ... movable body, 8 ... second terminal base, 14, 15 ... resistance film, 16 to 22 ... contact, 24 ... pressing _{portion, SW 1, SW 2, SW} 3 ... changeover switch, SW ₇ ... Washer switch, Re ... Variable resistance, W ... Wiper motor drive circuit

Claims (1)

[Scope of utility model registration request] 1. A case for holding an operating shaft having a knob at one end slidably in the axial direction and rotatably holding each of an OFF position, an intermittent drive position, a low speed drive position and a high speed drive position. A rotor that is fixed to the operation shaft in a rotational direction but is slidably fitted in the axial direction; and a first terminal base fixed to the inside of the case so as to face the rotor; A plate-shaped movable body that is urged toward the knob side and movably held along the axis of the operation shaft, and is fixed inside the case so as to face the movable body with a predetermined gap therebetween. A second terminal base, four contact plates arranged on one surface of the rotor, and a rotor connected to a wiper motor drive circuit and arranged on one surface of the first terminal base on the rotor side. With the contact plate of And a pair of resistance films forming a variable resistance, a contact plate provided on one surface of the movable body, and a second terminal connected to a washer driving circuit. A pair of contacts arranged on one surface of the base to form a washer switch together with the contact plate of the movable body, and a pressing portion provided on the operation shaft and facing the one surface of the movable body. And wiper switch.