Machine element or mechanism – Mechanical movements – Rotary to or from reciprocating or oscillating
Patent
1995-03-23
1996-10-22
Marmor, Charles A.
Machine element or mechanism
Mechanical movements
Rotary to or from reciprocating or oscillating
1525013, 1525030, 74600, B60S 124, F16H 2152
Patent
active
055665772
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a driving mechanism of a windshield wiper for an automotive vehicle, comprising a motor-driven wheel, in particular, a toothed gear, to which is eccentrically hinged one end of a toggle lever-type crank drive while the other end thereof is connected to the wiper shaft in a non-rotating way.
A wide variety of designs of windshield wiper systems for automotive vehicles provided with a driving mechanism of this type are well known in the art. Typical wiper systems include a wheel that is a toothed gear or, more precisely, a worm gear actuated by a worm which, in turn, is rotated by the electromotor. The rotating movement of this wheel or toothed gear is transformed with the aid of the toggle lever-type crank drive into a reciprocating or oscillating movement of the wiper shaft, with the two parts of the toggle lever-type crank drive being, in turn, also capable to be coupled to one another via toothed segments. It can be readily seen that in response to the eccentric hinge of the crank drive, with otherwise identical dimensions of the drive in general.sub.s varying wiping angles and also varying parking positions of the wiper shaft and, hence, of the wiper blade(s) vis-a-vis the windshield of the automotive vehicle are attainable. However, automotive manufacturers, in view of different configurations of the windshield to be wiped, desire different wiping angles and, in the event of windshield wipers having predetermined parking positions different parking positions. The toothed wheel, hitherto, has been specifically designed under consideration of the individual customer's requirement. This latter requirement in the first place refers to hinging the toggle lever-type crank drive on the toothed gear side, and in particular, it refers to the radial distance of the geometric axis of the toothed gear.
The fact that windshield wipers of this type, as a rule, are not produced by the automotive manufacturer but rather by an accessories manufacturer requires a special construction to be designed and manufactured for each windshield wiper, at least as far as the toothed gear is concerned. Conversely, windshield wiper system drives, virtually, are series-fabricated products in which even minor savings, below the line, may result in substantial cost reductions.
Accordingly, the problem addressed by this invention resides in so improving a driving mechanism of a windshield wiper for an automotive vehicle in order to permit more universal use with drives having at least varying wiping angles, but preferably also a predetermined parking position to be observed.
SUMMARY OF THE INVENTION
To solve this problem it is suggested, in the practice of the invention, to design the driving mechanism with an actuated wheel that was at least two selectively used hinge points for the crank drive where the crank drive has its other end connected to the wiper shaft in a non-rotating manner. Alternatively, at least one hinge point is over the axis of rotation in the radial direction of the wheel. As opposed to the prior known drives in which the toggle lever-type crank drive can be connected to the wheel or toothed gear in a specific predetermined way only, at least two different ways of connection have now been provided so that the driving mechanism of the invention can be used for at least two different driving mechanisms. For the sake of ease, reference will simply be made hereinafter to a "toothed gear" which is not intended to imply any restricted meaning.
The two selectively used hinge points can be provided on the toothed gear in a manner staggered with respect to one another either in the radial direction or both in the radial and in the circumferential direction. In case of a driving mechanism for a windshield wiper system with no specific parking position, the latter does not involve any problems. However, if a very special parking position is to be maintained provision will have to be made for enabling orientation in the rotating direction. Assuming that the toothe
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English Translation of International Preliminary Examination Report for Application PCT/EP93/01423 filed Jun. 4, 1993.
Grabow Troy
ITT Automotive Europe GmbH
Lewis J. Gordon
Marmor Charles A.
Twomey Thomas N.
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