Electricity: circuit makers and breakers – Periodic – Cam operated
Reexamination Certificate
1998-09-11
2001-07-03
Friedhofer, Michael (Department: 2832)
Electricity: circuit makers and breakers
Periodic
Cam operated
C200S013000
Reexamination Certificate
active
06255605
ABSTRACT:
BACKGROUND OF THE INVENTION
Field of the Invention
The present invention is concerned with a driving mechanism for windscreen wipers having a park position switch.
A driving mechanism of the afore-mentioned type has been described in EP 398630 A2. The contact bridge is shown to be an element displaceable within the lid of the gear box, which, by means of cams provided on the worm-wheel, can be reciprocated between two positions. To that effect, the contact bridge comprises a web guided in a corresponding slot. In the prior art arrangement, it is difficult to lock the contact bridge against dropping. Also, problems are encountered in generating a corresponding bias to place the contact bridge in adequate contact with the counter-contacts.
SUMMARY OF THE INVENTION
It is, therefore, suggested by the invention that the contact bridge be tiltably arranged on a pin within the case. In such an arrangement, the contact bridge can be locked on the pin by means of a simple locking ring. Moreover, an adequate bias can be generated by providing a spring between the contact bridge and the locking ring. Preferably, the contact bridge is made of a plate from which two contact tags are so bent that the closing edges of the tags slide on corresponding contact banks within the casing. The two contact banks, preferably, are arranged diametrically opposite the swivel axis and, preferably, are at an equal distance from the swivel axis.
In order to enable the contact bridge to be swiveled, two switch flaps are bent from the plate, the bending edges of which are approximately disposed on lines extending through the pivot. The switching flaps cooperate with cams on the driving rear wheel of the wiper gear. The switch flaps, preferably, are arranged on both sides of an imaginary line between the contact legs.
It is of advantage, especially with gear boxes made of plastic material, to locate the switch in or on the box bottom, with the contact banks to be contacted being guided in the bottom of the case and closing flush with the inner side of the case bottom. The contact banks, on one end, are guided through the motor flange into the motor and, on the other end, are guided in a plug housing arranged on the gear box. The pivot pin is integrally formed with the plastic box.
This arrangement involves the advantages that the contact bridge is easy to assemble and that the distances covered by the contacts during the operating life of a driving mechanism are reduced over those of conventional switches so that additional contact rivets can be eliminated.
REFERENCES:
patent: 4259624 (1981-03-01), Seibicke
patent: 4609794 (1986-09-01), Porter
patent: 4700026 (1987-10-01), Kamiyama et al.
patent: 5068500 (1991-11-01), Kitada
patent: 5147989 (1992-09-01), Ito
patent: 5422449 (1995-06-01), Kano et al.
patent: 1061641 (1956-11-01), None
patent: 7145933 (1971-12-01), None
patent: 2026548 (1971-12-01), None
patent: 2621370 (1977-12-01), None
patent: 3440764 (1986-05-01), None
German Search Report dated Aug. 29, 1996.
PCT International Search Report dated Jun. 27, 1997.
Leiter Heinz
Losch Dieter
Friedhofer Michael
ITT Manufacturing Enterprises Inc.
Lewis J. Gordon
LandOfFree
Windscreen wiper drive device with a park position switch does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Windscreen wiper drive device with a park position switch, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Windscreen wiper drive device with a park position switch will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2537645