DE873802C - Windshield wipers, in particular for motor vehicles - Google Patents

Description

Windshield wipers, particularly for motor vehicles The invention relates to a windshield wiper, especially for motor vehicles, whose by a crankshaft, driven wiper arm after switching off the main switch regardless of the time of the main switch by moving one of the push rods located pivot, through which the conversion of the motor rotation into the Pivoting movement of the wiper arm serving push rod on the revolving crank arm or is articulated on the lever arm actuating the wiper arm, automatically in a lateral rest position is pivoted outside of the field of view. Upon reaching this rest position is directly or indirectly a parallel to the main switch Horizontal auxiliary switch open.

It is a disadvantage of ordinary windshield wipers that the driver does When switching off the wiper motor, the wiper arm can only be adjusted by carefully adjusting the correct switch-off time if possible outside the field of view in one of his brings lateral limit positions to a standstill.

A windshield cleaner is already known, both of which Wiper arm regardless of when it was switched off by opening an auxiliary switch with a sliding contact following the movement of the wiper in one of its lateral sides End positions comes to rest. It's also a windshield wiper known, in which the wiper arm in a lateral limit position outside of the field of view can be swiveled. In this known windshield wiper, however, there is a special motor with forward and reverse rotation required -: the one for pivoting the wiper arm in the lateral limit position outside the field of view set to reverse must be, then a special curved path for the purpose of changing the distance between the crank pin and its pivot point is operated.

Finally, a device of the same type is known at which, however, in order to achieve the limit position by means of a manually operated, Handle the desired lateral position of the wiper arm outside, the. Visual field is achieved, in addition, the engine must be switched off.

On the other hand, the subject matter of the invention is a common one Sliding wiper motor can be used, and it @ is with the simplest structural design just operate a single switch. According to the invention: this thereby achieved that the removal of at least one of the tenons on which the conversion the rotary movement in the pivoting movement serving push rod is mounted from: the The fulcrum or pivot point of the arm carrying it is variable.

All details emerge from the following description in connection with the drawing, in which an embodiment is shown schematically; in which the cam track acting on the sliding pushrod pin is designed as a slotted cam disk which is usually taken along by the crank arm used to drive the pushrod and only comes into effect when it is activated electromagnetically as soon as the main switch is in its off position, by one of them. activated electromagnet is held, whose current as well as the motor current is automatically switched off by the crank arm itself or the pin carriage sitting on it as soon as the wiper arm has reached the desired lateral limit position. FIG. 1 shows a representation of a wiper with the main switch switched on, FIG. 2 the switching elements after the main switch is turned to - .the switch-off position when the engine is still running, and FIG Has come to a standstill.

In the circuit of the wiper motor i, the main switch i8 and the auxiliary switch 2.o. are located in the parallel lines 30 and 31 branching off at point i9. If the switching lever 32 of the main switch is in position I (Mg. I), the motor circuit is closed via the line 30. By moving the switch lever 32 of the main switch 18 into position II, the line 30 is interrupted without, however, the motor circuit being interrupted; because. the motor circuit remains temporarily closed by the auxiliary switch 2o located in the line 31 until this auxiliary switch is also opened by sliding the insulating piece 17 sideways to the left. Only then is the motor circuit finally interrupted.

When the shift lever 32, the main switch 18 is in the for the Main circuit; position II, which is valid as the switch-off position (Fig. 2 and 3), it becomes the electromagnet circuit branching off at junction point 22 io closed. In this circuit there is the auxiliary switch 2.5, which is through Glass common insulating piece 17 together with the auxiliary switch 2o are opened can, whereupon the electromagnet io is de-energized.

The wiper motor i drives the gear train (not shown) Axis 23, which is firmly connected to the crank arm, 2: is. The crank arm 2 has a Running in its longitudinal direction, for example -schwalbengchwa = shaped sled track 3, in which the den; Push rod pin 6 carrying carriage 5 can slide, whose the front end has a nose 4.

By sitting on the pin 6 connecting rod 14 is in, in itself known way the rotating motor movement via the toothed segment 32 provided Transfer lever 2 ¢ and the gear 15 into the pivoting movement of the wiper arm 16.

During operation, the wiper arm 16 sweeps the angular field of approximately 12o Abis 15o °, which is limited by points A and B on the windshield 33, as long as the slide carrying the crank pin 6 is; 5 is in the normal position shown in Fig. I. On the axis 23, the disk 7 is .lose mounted, which has a hook-shaped detent 9 formed by a recess on its edge. In the disk 7 is the curved obliquely outwardly extending slot 8, in which the rear end of the push rod pin 6 sitting on the carriage 5 engages: The cam slotted disk 7 is usually supported by the crank arm 2 by means of the one on it, on the other hand, the helical spring 26 attached to the crank arm 2 is entrained in the direction of the arrow 34.

Next to the disc 7 is the one provided with a hook-shaped finger, pawl iz pivotable about axis 27. arranged, usually by the helical spring 13 is held in the position shown in FIGS. On her is on the handlebar 28, the movable armature ii in the electromagnet iö hinged, which, as soon as the electromagnet winding io is energized, the pawl 12 against the outer edge of the pane? pulls so that the pawl 12 when the Disc ? has reached the position shown in FIG. 2, engages in the nose 9 and thereby the disc 7 in the in Big. 2 shown, holds position while the crank arm 2 at the same time Tension the helical spring 26 continues (Fig. 2). Here, the carriage 5 is pushed into the cam slot 8 engaging rear end of the push rod pin 6 pushed outwards, whereby as a result of the resulting extension of the crank arm, the levers: 24 is pivoted to the left beyond its normal position and the wiper arm 16 the hatched angular field between points B and C in FIG.

As soon as the crank arm 2 starts rotating in the direction of the arrow has come to the position shown in FIG. 3, the protrudes from the carriage 5 attached nose 4 so far beyond the circumference of the disc 7 that the Switches, 2o, and 2: 5 attached insulating piece 17 pushed to the left. becomes what the auxiliary switches 20 and 25 are opened. This will both the motor circuit as well as the circuit of the electromagnet io interrupted, so that the motor i and the crank arm driven by it: 2 stop and the, pawl- 12 from the tensioned helical spring 13 in the position shown in Fig. 3 out of engagement is withdrawn with the disc 7.

If the switch lever 32 of the main switch 18 is now moved to the on position I to switch on the wiper motor i, the motor circuit is closed via the line 30 , whereupon the crank arm 2 moves in the direction of the arrow 34 from the position shown in FIG. 3 in the direction of the Arrow 34 is put into circulation.

The spiral spring 26 pulls the loose cam slotted disk 7 back into the position shown in Fig .points A and B moved.

Claims (6)

PATENT CLAIMS: i. Windshield wipers, especially for motor vehicles, whose wiper arm driven by a crankshaft after switching off the Main switch regardless of when the off switch is actuated Displacement of one of the pivot pins on the push rod through which which serves to convert the motor rotation movement into the pivoting movement of the wiper arm Push rod on the revolving crank arm or on the one that actuates the wiper arm Lever arm is articulated, automatically in a lateral rest position outside of the Field of view is pivoted and when this rest position is reached indirectly or directly parallel to the main switch. Auxiliary switch opens, thereby characterized in that the removal of at least one of the pins (6) from the rotary or pivot point (z. B. 23) of the arm carrying it (z. B. 2) is variable. 2. Windshield wiper according to claim i, characterized in that the movable push rod pin (6) is arranged on a carriage (5) and along the arm (2) carrying it is moved. 3. Windshield wiper according to Claims i and 2, characterized in that that the push rod pin (6) carrying carriage (5) through one of the desired. Shift corresponding, with the push rod pin (6) cooperating cam slot (8) is displaced in a disc rotatable on the crankshaft shaft (23), which usually carried along by the crank arm (2) and after opening a main motor switch (18) is held so .that the push rod pin by the inevitable guide in the curve slot as you turn the crank arm that supports it is pushed outside until a catch (4) connected to the crank arm, nose or the like. The auxiliary switch or switches (2o,: 25) is opened and the motor is thereby switched off will. 4. Windshield wiper according to Claim 3, characterized in that the main switch is d.aß (18) in, the switch-off position (II) closes the circuit of an auxiliary relay (io), through the central be brought into their operative position. 5. Windshield wiper according to the claims. i to 4, characterized in that the crank arm (2) is held in its position corresponding to the normal wiper arm pivoting (AB) by a helical spring (26) or the like arranged between it and the slotted cam disk (7). 6. Windshield wiper according to the claims. i to 5, characterized in that the slotted cam disc (7) is held in place by a detent (9) attached to it, into which a pawl (12) operated by the auxiliary relay (io) engages. Cited publications: German Patent Specifications No. 415 996, 599 776; French Patent No. 856 588; British Patent No. 46,1255.