Brushing – scrubbing – and general cleaning – Attachments – Optical-member-attachable cleaner
Patent
1997-07-10
1998-09-08
Graham, Gary K.
Brushing, scrubbing, and general cleaning
Attachments
Optical-member-attachable cleaner
B60S 138
Patent
active
058026630
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention is based on a known wiper blade (DE 4319139 A1), wherein for distributing the contact pressure a single spring rail is arranged as spring element in the head strip.
However, if it is necessary, for example, to provide a soft material mixture for the wiping strip, this can result in an impermissibly large twisting of the head strip in respect to the other strip areas during the wiping operation, in particular while wiping a not sufficiently moistened windshield surface, so that the sweeping strip touches the windshield surface. Because of the increase in friction between the windshield and the wiping strip caused by this, it is possible for the head strip to be levered out of the support frame, so that the wiper device no longer can do its job. Widening the spring rail cannot remove this shortcoming without disadvantages, since the increase in the stiffness of the spring rail connected with this could hamper the conformation of the wiping strip to the continuously changing windshield contour. A simultaneous decrease in the thickness of the spring rail would make the easy assembly capacity of the spring rail questionable.
SUMMARY OF THE INVENTION
In contrast to this, the spring means of the wiper blade in accordance with the invention are constituted by several--at least two--rod-like spring elements which are arranged in a plane, which is at least approximately parallel with the wiping plane, and parallel with each other. Because of this it is possible to place each one of these rod-like elements separately into the longitudinal edge areas of the head strip, which are gripped by the support frame. The danger of the wiping strip being levered out of the support frame is prevented because of the reinforcement connected with this. The total width of the two spring elements which is effective in the stiffening of the head strip can be easily adapted to the--regarding the conformation of the wiping strip to the windshield contour--important requirements.
To this end it has been shown to be practical that the spring elements are designed to be rectangular in cross section. Thus, extended leaf springs result which can be manufactured particularly simply, for example from spring band steel.
A particularly simple, possibly even automatic assembly of the spring elements results if, in a further development of the invention, the elements are placed in longitudinal channels which are closed on all sides and are provided in the head strip and terminate at the two front faces of the head strip.
It is possible to achieve the simple securing against a longitudinal displacement of the spring elements in the head strip, if furthermore the rod-like, elongated spring elements are provided with at least one lateral recess, which is associated with one of the holding claws of the support frame, which embrace the head strip.
In order to simultaneously obtain security against longitudinal displacement of the wiping strip in respect to the support frame, in a further embodiment of the invention the holding claw of the support frame pushes the area of the head strip constituting the wall of the longitudinal channel, which is embraced by it, into the lateral recess of the elongated field means.
Further advantageous embodiments and improvements of the invention can be drawn from the following description of an exemplary embodiment of the invention, which is represented in the associated drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
For a detailed explanation of the invention,
FIG. 1 shows a partial side view of a wiper blade,
FIG. 2 a section through the wiper blade in FIG. 1 along the line II--II in an enlarged representation,
FIG. 3 a section through the arrangement in FIG. 2 along the line III--III, not shown to scale, and
FIG. 4 the representation, not to scale, of a spring element which is part of the wiper blade.
DESCRIPTION OF THE PREFERRED EMBODIMENT
A wiper blade 10, partially represented in FIG. 1, has in a manner known per se a multi-section elongated support frame 12. In th
REFERENCES:
patent: 2792585 (1957-05-01), Scinta
patent: 3094734 (1963-06-01), Hoyler
patent: 4658463 (1987-04-01), Sugita et al.
patent: 5231730 (1993-08-01), Schmid et al.
patent: 5412834 (1995-05-01), Burkaid et al.
patent: 5661871 (1997-09-01), Scorsiroli
Graham Gary K.
Robert & Bosch GmbH
Striker Michael J.
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