Appeal No. 98-2005
Application No. 08/571,156
without any remarkable jerk, because this
does not only lead to annoying noises but
in the long run also to detrimental
influences on the driving mechanism as a
whole.
Thus, Buhl seeks to provide an apparatus wherein a smooth
or cushioned inversion of motion is achieved in either
direction of movement of the wiper spindle. As noted in
column 1, lines 39-67, Buhl attains this objective by
developing an apparatus for limiting the wiper angle of the
windshield wiper unit, that apparatus including a spring
element that
is fixed to a housing, preferably to the
cover of the gearing and is thus retained
unrotatingly and unslidingly. An angled-
off free end of a springy arm of the spring
element borders each side of a gap between
two teeth of a part-pinion which defines a
toothless section. A springy arm involved
at a particular moment :is elastically
deflected when a first or last tooth of the
part-pinion comes to strike against the
angled-off free end of the respective
springy arm. The spring element is
associated with the pinion gap in such a
way that the striking of the tooth against
the angled-off free end or stop member of
the springy arm takes place shortly before
an inversion of motion. Since an
increasing bend of the springy arm brings
about an increased rotational resistance,
the final phase of the rotational movement
of the part-pinion and wiper spindle will
progressively be braked in both end
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