Wiper arrangement with a rotatable wiper arm in addition to the

Details Wiper arrangement with a rotatable wiper arm in addition to the Wiper arrangement with a rotatable wiper arm in addition to the

1995-09-26

1997-07-15

Graham, Gary K.

Brushing, scrubbing, and general cleaning

Attachments

Optical-member-attachable cleaner

1525034, 1525031, 74570, 74 96, B60S 134

Patent

active

056470851

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

The present invention relates to wiper arrangements, and more particularly to wiper arms in which the position of the wiper blade is adjustable in accordance with the curvature of the windscreen to be cleaned.


BACKGROUND OF THE INVENTION

The requirement of an angular adjustability of the wiper blade is increasingly imposed in view of the fact that windscreens more frequently are designed curved to minimize the air resistance coefficient of automotive vehicles. To adjust the angular position of the wiper blade, a multiplicity of solutions has been offered in which, on the one hand, the wiper blade itself is adjusted with respect to the wiper arm while, on the other hand, one end section of the wiper arm is rotated with respect to the remainder of the mounting section.
DE-OS 3 900 525 teaches to provide a means for fixing the wiper arm to the wiper spindle which is pivoted along with the wiper spindle, thereby also causing a reciprocating movement of the remainder of the wiper arm. In addition, the remainder of the wiper arm is rotatably arranged within the mounting means, with the remainder of the wiper arm during its oscillating movement being rotated by a corresponding crank control. The disadvantage of this arrangement is that the section of the wiper arm associated to the wiper spindle is divided into two oppositely movable parts requiring enhanced mechanical efforts. Moreover, the prior known construction regarding the rotating movement of the wiper arm permits only relatively short force levers.
FR 2 625 715 discloses a wiper arrangement in which the reciprocating pivotal movement of the wiper arm about the axis of the wiper spindle is superimposed by an additional reciprocating rotary movement of the wiper arm about the longitudinal axis thereof. The wiper arm is fixed to a control part, which by means of another component secured to the wiper spindle, is pivoted about the axis of the wiper spindle and at the same time is pivotally rotated by moving a control curve about the longitudinal axis of the wiper arm. The disadvantage of this solution resides in the bearing points of the control part which are exposed to very high loads because all forces transferred to the wiper arm travel exclusively through the bearing points (the bearing points are required to accommodate all counter-forces of the wiper arm).


SUMMARY OF THE INVENTION

The object of the invention is to provide a simpler wiper arrangement of this type and to reduce the number of required components.
This object is fulfilled in that the section of the wiper arm is not divided into one part only pivotable and another part pivotable and rotatable but rather in that the entire wiper arm is not only pivotable but also rotatable in a direction vertical to the reciprocating movement.
In view of the fact that a spherical ring is secured to the wiper spindle, the spherical outer face of which is embraced by a control sleeve, a relatively large, common bearing surface is formed which is able to withstand relatively high loads. Moreover, the geometry of this spherical bearings face ensures a reliable control of the wiper arm connected to the control sleeve.
Once the wiper arm is connected to the spherical ring by means of two journals arranged on the longitudinal axis of the wiper arm and radially extending through the control sleeve, a very safe connection is established between the wiper spindle and the wiper arms so that relatively high torques can be initiated in the pivoting plane of the wiper arm. If one end of a journal is provided in an axial recess of the wiper arm while the other end is arranged in a radial recess of the spherical ring, a relatively easy assembly of the individual components is permitted.
To increase the leverage for applying the force required for the rotating movement about the longitudinal axis of the wiper arm, it is preferred that the control disk is formed with a control curve by radially projecting the circumferential edge of the control disk onto the bearing sleeve for the wiper spindle. The co

REFERENCES:
patent: 2412319 (1946-12-01), Carey
patent: 2533963 (1950-12-01), Sacchini
patent: 2878506 (1959-03-01), Krohm
patent: 4546518 (1985-10-01), Harbison et al.
patent: 5033157 (1991-07-01), Von Meltzing et al.

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