Brushing – scrubbing – and general cleaning – Attachments – Optical-member-attachable cleaner
Reexamination Certificate
1999-09-09
2001-06-26
Graham, Gary K. (Department: 1744)
Brushing, scrubbing, and general cleaning
Attachments
Optical-member-attachable cleaner
C015S250351
Reexamination Certificate
active
06249929
ABSTRACT:
BACKGROUND OF THE INVENTION
PRIOR ART
The invention is directed to a windshield wiper arm for windshield wipers. Conventional windshield wiper arms substantially comprise a fastening part and a joint part. The fastening part is connected with the wiper shaft so as to be fixed with respect to rotation relative to it and has an articulation pin at which the joint part is articulated. Generally, a wiper blade is fastened to the end of the joint part opposite the pin, likewise so as to be articulated. Between the fastening part and the joint part, there is arranged a spring which, on the one hand, generates the necessary pressing pressure on the wiper blade for proper wiping and, on the other hand, forces the joint part into a stable position in a folded-away position, as it is called, which is necessary for changing the wiper blade. A disadvantage in these constructions consists in that a gap inevitably remains between the fastening part and the joint part, which gap can accumulate dirt and causes wind noises and also detracts from the visual appearance.
EP-OS O 770 526 discloses a wiper arm whose joint part extends over the fastening part and is articulated on the side opposite the wiper blade receptacle with respect to the holding of the wiper shaft at the fastening part. In order to take into account the function of the spring—namely, to generate contact pressing pressure on the one hand and to ensure a stable folded-away position on the other hand—an intermediate part is provided which is articulated in the area of the articulated position known from conventional wiper arms; the spring cooperates with this intermediate part. This intermediate piece transmits the contact pressing pressure generated by the spring to the joint part of the wiper arm via an additional pin and forces the joint part in the folded-away position into the stable position. While this construction eliminates a gap between the fastening part and joint part, its construction is uneconomical and requires more space.
SUMMARY OF THE INVENTION
The windshield wiper arm according to the invention with the features of the main claim has the advantage of a very simple construction with a joint and fastening part and a spring acting between these parts as in conventional wiper arms. However, because of the special arrangement of the joint pin and the contact points or points of application of the spring, a construction is achieved which is free of gaps. Further, it is possible to integrate the fastening part and spring inside the joint part of the wiper arm in a compact and space-saving manner.
The features according to the invention which are indicated in the subclaims make possible advantageous further developments of the windshield wiper arm according to the main claim. The arrangement of the contact point of the spring at the joint part on the side of the articulation pin makes possible a construction which is even more compact because this joint part can pivot very closely about the articulation pin. Therefore, the two end positions loaded by the spring, i.e., the folded-down position and folded-away position, can be achieved very simply.
Additional space is saved in that the application point of the spring at the joint part is located above the articulation pin and the application point of the spring at the fastening part is advantageously located below the articulation pin. The spring accordingly arrives in the area in which there is sufficient space without the need for the joint part to bulge out for this purpose.
Due to the advantageous construction of a stop shoulder and a counter-shoulder at the joint part and fastening part, respectively, a precise folded-away position can be achieved without the need for additional parts.
The pendulum motion during the wiping operation can be transmitted exactly to the longitudinally extending joint part due to guide means which are formed integral with the fastening part. The pin necessary for the folded-away movement is accordingly relieved of the transmission of torque for the pendulum movement.
It is especially advantageous that a tension spring can be used; this tension spring is very simple to produce and, unlike pressure springs, for example, has no need of supporting means. The available space is taken into account in that the spring is advantageously formed of two or more parts and, in particular, comprises a tension spring and a U-shaped spring. In the simplest case, the U-shaped spring is a wire part which tightly engages around the receptacle of the wiper shaft.
REFERENCES:
patent: 3548442 (1970-12-01), Stratton
patent: 4050832 (1977-09-01), Stratton et al.
patent: 4545088 (1985-10-01), Kohler et al.
patent: 227619 (1959-04-01), None
patent: 0 770 526 A1 (1997-05-01), None
patent: 2124714 (1972-09-01), None
patent: 636637 (1950-05-01), None
patent: 958555 (1964-05-01), None
Graham Gary K.
Robert & Bosch GmbH
Striker Michael J.
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