Brushing – scrubbing – and general cleaning – Attachments – Optical-member-attachable cleaner
Patent
1990-02-09
1991-05-07
Hornsby, Harvey C.
Brushing, scrubbing, and general cleaning
Attachments
Optical-member-attachable cleaner
1525013, 74600, B60S 122
Patent
active
050125257
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention is relates to a wiper device comprising an electric motor and a crank for translating rotational movement of the motor shaft into oscillating movement of a rocker shaft connected with a wiper arm. The crank is supported in an eccentric bush movable between two positions with respect to the device housing in one of which the wiper blade is in a rest position thereof. A wiper device is already known (DE-OS 18 12 307) in which the drive device is provided with a construction comprising magnet and locking means which is costly and susceptible to failure and which enables the rotating movement of the eccentric bush when the wiper device is to be stopped. However, this rotating movement can only be initiated and carried out after the last pendulum stroke is concluded. Also when starting the wiper device, the pendulum movement can only be effected after the rotational restoring movement of the eccentric bush has been concluded, so that valuable time is lost in certain traffic situations before the necessary wiping pendulum movement of the wiper blade can be carried out. In addition, the noises occurring during locking are annoying.
It is also known (DE-OS 32 18 373) to arrange an adjusting mechanism on a rocker belonging to the pendulum gear unit and to adjust the point of articulation between a connecting rod and the rocker with this adjusting mechanism, so that there is an additional swiveling movement of the wiper blade into the rest or parked position located outside of the wiping field.
However, this solution requires additional space which is not available in the area of the rocker. Moreover, it is a disadvantage in this solution that the supply cable of the adjusting mechanism must compensate for the pendulum movement of the rocker occurring during the wiping operation of the wiper device and the adjusting mechanism increases the mass to be moved.
SUMMARY OF THE INVENTION
The object of the invention is a wiper device, in which the adjusting mechanism of the eccentric bush can be integrated in the drive device, which is arranged so as to be stationary with respect to a frame, so that a compact drive unit results which also solves the other problems of the known wiper devices.
The present invention both as to its construction so to its mode of operation, together with additional objects and advantages thereof, will be best understood from the following detailed description of the preferred embodiments when read with reference to the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows a schematic view of an oscillating wiper device in which the wiper blade is placed in a rest or parked position located outside the wiping field;
FIG. 2 shows a cross-sectional enlarged view of a gear unit belonging to a drive unit of the wiper device according to the invention;
FIG. 3 shows a partial cross-sectional view of the gear unit along line III-III in FIG. 2;
FIG. 4 shows a cross-sectional view of the arrangement according to FIG. 3 along line IV-IV;
FIG. 5 shows a partial cross-sectional view similar to FIG. 2 of another embodiment of a gear unit
FIG. 6 shows a sectional view similar to FIG. 4 of the corresponding arrangement of the gear unit construction shown in FIG. 5;
FIG. 7 shows a schematic view of the crank movement during the wiping operation and the crank position when the wiping blade is parked;
and FIG. 8 shows a sectional view similar to FIG. 2 of another embodiment of a gear unit according to the invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
A wiping device 10 shown in FIG. 1 comprises a drive device 12 which drives a crank 14 for rotating the same in the direction of arrow 16. One end of a connecting rod 18 is articulated at the crank 14, the other end being pivotable connected with the free end of a rocker 20. The other end of the rocker is fastened to a rocker shaft 22 which is supported so as to be stationary with respect to a frame, one end of a wiper arm 24 being arranged at the rocker shaft 22. A wiper blade 26, which contac
REFERENCES:
patent: 3091128 (1963-05-01), DeRees et al.
patent: 3242520 (1966-03-01), Carroll et al.
patent: 3353425 (1967-11-01), Abel, Jr.
patent: 3616702 (1971-11-01), Kolb
patent: 3808629 (1974-05-01), Druseikis
patent: 4791698 (1988-12-01), Murata
patent: 4794818 (1989-01-01), Eustache
Graham Gary K.
Hornsby Harvey C.
Robert & Bosch GmbH
Striker Michael J.
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