Brushing – scrubbing – and general cleaning – Attachments – Optical-member-attachable cleaner
Patent
1988-01-29
1989-02-28
Feldman, Peter
Brushing, scrubbing, and general cleaning
Attachments
Optical-member-attachable cleaner
1525025, B60S 124, B60S 126
Patent
active
048073253
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a windscreen wiper. A windscreen wiper of this kind is already known (German Pat. No. 22 15 307), in which the gear wheel is supported on the pendulum lever and meshes directly with the teeth. The crank which is part of the thrust crank mechanism is also firmly connected to this gear wheel. These two constructional criteria result in an invariable distance between the axis of rotation of the crank and of the pendulum axis, so that for each area of the windscreen to be wiped, a completely new wiper step-up gear must be designed.
It is also known to support the gear wheel fixedly in the chassis in the pendulum axis (Examined German patent application DE-AS No. 10 66 890) and to move a convexly curved rack that meshes with the gear wheel past the gear wheel. However, this windscreen wiper does not differ in terms of the principle of its construction from the known wiper device described above, and so the above-mentioned disadvantages are present here as well.
SUMMARY OF THE INVENTION
It is an object of this invention to provide a windscreen wiper which has the advantage over the prior art that the gear wheel supported on the pendulum lever has merely an intermediate wheel function, so that the transmission takes place between the second gear wheel supported on the guide element and the teeth concentric with the pendulum axis. By means of the toothed belt, the length of which is adaptable for specific customer requirements, rigid construction criteria can be relaxed, and so changes in the transmission ratio can be attained by matching the number of teeth of the second gear wheel to a corresponding adaptation in length of the toothed belt. The arrangement of the toothed belt also results in quiet, smooth operation of the wiper transmission gear.
It is particularly advantageous to dispose the teeth on the side wall of a cup-shaped housing connected to the chassis, the bottom of the housing being penetrated by a shaft driven in pendulum fashion and having the pendulum axis, because this provision produces a particularly economical gear.
The novel features which are considered as characteristic for the invention are set forth in particular in the appended claims. The invention itself, however, both as to its construction and its method of operation, together with additional objects and advantages thereof, will be best understood from the following description of specific embodiments when read is connection with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWING
FIG. 1 is a plan view on an automobile windscreen, with a wiper associated with it;
FIG. 2 is schematic view illustrating the principle of the wiper of FIG. 1, in which the wiper arm is shown in one return-point position, that shown in FIG. 1;
FIG. 3 shows the wiper of FIG. 2, in which the wiper arm is in another operating position;
FIG. 4 shows the wiper of FIG. 2 in which the wiper arm is in still another operating position;
FIG. 5, a plan view on a step-up gear of the wiper, drawn realistically;
FIG. 6 is a section taken through the gear along line VI--VI of FIG. 5; and
FIG. 7 is a fragmentary view of a toothed belt of the gear of FIGS. 5 and 6 .
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
A wiper 12 is associated with a windscreen 10 shown in FIG. 1. The wiper has a step-up gear 14, which drives a wiper arm 16 back and forth. The wiper arm, along with a wiper blade 18 secured to its free end, moves back and forth about a pendulum axis 20, which belongs to the step-up gear 14, between two return-point positions as indicated by a double arrow 22 in FIG. 1. One return-point position is represented by a solid line in FIG. 1, while the other return-point position is shown in dashed lines and marked 18'. During the back-and-forth movement, a sliding motion extending radially to the pendulum axis 20 is imparted to the wiper blade 18 resting on its wiping side 10, so that the wiping area 24 swept by the wiper blade 18 has a shape that deviates from a circular segment. Wipers operating
REFERENCES:
patent: 2516808 (1950-07-01), Seger
patent: 2827653 (1958-03-01), Dyer et al.
patent: 3831220 (1974-08-01), Gmeiner et al.
Feldman Peter
Robert & Bosch GmbH
Striker Michael J.
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