Device, especially reciprocating stroke wiper system for motor v

Details Device, especially reciprocating stroke wiper system for motor v Device, especially reciprocating stroke wiper system for motor v

1988-06-30

1989-11-14

Feldman, Peter

Brushing, scrubbing, and general cleaning

Attachments

Optical-member-attachable cleaner

1525023, B60S 126

Patent

active

048797839

DESCRIPTION:

BRIEF SUMMARY
This invention relates to a device, especially a reciprocating stroke wiper system for motor vehicles, according to the features of the generic part of claim 1.
In many applications of a device of this kind the piston has to be guided in such a way that it cannot turn around its longitudinal axis during its motion. This also applies to so-called reciprocating stroke wiper systems in which during the pendulum-motion the windscreen wiper fixed on the piston is retracted and extended in radial direction, so that the corner areas of a windscreen can also be reached by the wiper blade of the windscreen wiper.
A reciprocating wiper system is known from the German specification OS 3,409,256 in which a projecting arm is fixed on the piston in a manner protected against twisting which projecting arm includes guide grooves in its diametrically opposite end areas in which guiding elements fixed on the housing in the shape of flat rails engage. The depth of said grooves in the guiding projecting arm is larger than the portion of the guiding rails fittingly protecting into said grooves. If in the plane they define the guiding rails are not aligned in accurately parallel direction to each other and parallelly to the direction of motion of the piston, this does not affect the smooth running of the piston because the guiding rails can more or less dip into the grooves on the guiding slide. However, if the guiding rails were arranged in a skew-whiff manner, it could not be excluded that the piston is hard going in case of a rigid connection between projecting arm and piston. In order to avoid this disadvantage the projecting arm of this known construction is movably held on the piston in one direction so that these detrimental tolerances with regard to the position of the guiding rails can be compensated. For this purpose the piston is formed as a pivot with cheeks at its end, which is put into a somewhat larger recess of the slide. Thus in these constructions tolerances of shape and position of the guiding elements and of the projecting arm unavoidable in practice are compensated so that the piston can be smoothly moved. It also has a favourable effect on the lifetime of a device like that. However, as to the production of a protection against twisting for the piston considerable difficulties and costs are involved. The guiding elements have indeed to be worked in a special way in order to provide for the necessary smooth surface. This is very costly in case of flat guiding elements with the shape of rails. Because of the piston end formed as a pivot with cheeks it is also linked with considerable costs to produce a connection with play between piston and slide. The projecting arm has a relatively complicated form of space and it is therefore not inexpensive to produce it. Furthermore additional elements are necessary to fix the projecting arm in the direction of the motion.
Thus the object of the present invention is to simplify a device of the initially mentioned kind with regard to a protection against twisting for the piston and improving it with regard to its guiding qualities. Of course, in comparison with the known construction, the running qualities and the lifetime must not be lowered even in case of mistakes as to tolerances of shape or position of the guiding elements and of the slide.
This problem is solved according to the invention by the characterizing features of claim 1.
Thereby the invention is mainly based on the idea that the possible guiding area on the guiding element can be reduced in comparison with the possible guiding area on the guiding fork without lowering the lifetime of the guide, if it is taken care that during the motion the distance between the effective guiding areas and the direction of motion or direction of the axis of the piston changes. For by continuously changing the effective guiding areas crosswise to the direction of motion during the motion the area used is, so to speak, enlarged so that no play can be reckoned upon for a longer period of time. According to an especially prefe

REFERENCES:
patent: 4625359 (1986-12-01), Egner-Walter et al.
patent: 4648148 (1987-03-01), Egner-Walter et al.

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