Machine element or mechanism – Mechanical movements – Reciprocating or oscillating to or from alternating rotary
Patent
1995-07-12
1998-03-10
Marmor, Charles A.
Machine element or mechanism
Mechanical movements
Reciprocating or oscillating to or from alternating rotary
1525029, 475331, F16H 2702, B60S 126
Patent
active
057248559
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to transmission gear for use with systems for cleaning windscreens, window-panes or optical instruments and more particularly relates to the transmission gears used in manipulating wiper devices used in such systems.
BACKGROUND OF THE INVENTION
The problem involved with transmission gears of the afore-mentioned type as described, for example, by DE-PS 29 19 240 resides in that the required transmission ratio is achievable only with high technical efforts requiring the provision of parts exposed to wear as the gear is subjected to substantial forces.
Based on the afore-going state of art it is the object of the invention to so improve the transmission gear of the afore-described type with the aid of simple means that the desired transmission ratio is readily attained.
The principle underlying the invention resides in that known per se and proven toothed gears are provided between the driving part and the driven part of the transmission gear, with the driven part formed as the housing being readily connectable to the tensile and/or thrust member. By correspondingly selecting the outer diameter of the housing and the toothed gears, the desired transmission ratio of the gear can be selected accordingly.
According to a particularly advantageous embodiment, the part is in the form of a casing accommodating the toothed gears, it being particularly advantageous for the part to be of a pot-type design. The pot-shaped part, hence, fulfills two functions: on the one hand, it accommodates all parts of the transmission gear, protecting it against damage and, on the other hand, it forms, at the same time, the part which, directly or indirectly, exerts forces on the carriage.
According to another advantageous embodiment three toothed gears are provided that are in engagement with the outer gear of the hub and the gear of the shaft. In this respect, it is feasible for the axes of the toothed gears to be in a spaced relationship from and about the shaft axis, thereby insuring a uniform load and distribution of forces within the housing. Moreover, according to a particularly advantageous embodiment, the cylinder pins are rigidly connected to a mounting frame of the system. The mounting frame forms a supporting part to which all essential parts of the system, including the transmission gear, are detachably connected.
Finally, according to a particularly advantageous embodiment, the radial outer side of the housing is provided with thread-type grooves in communication with the tensile element formed as a cable or belt. In order to be able to properly clamp the cable exposed to substantial forces provision is made according to another advantageous measure of the invention that the housing formed as a cast or injection-moulded element includes a clamping means for the cable.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows a linear wiper system with a transmission gear;
FIG. 2 shows the linear wiper system of FIG. 1 in the direction of flash II of FIG. 1;
FIG. 3 shows the part designated by III in FIG. 1 on an enlarged scale; and
FIG. 4 is a sectional view along the line IV--IV of FIG. 3.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
FIGS. 1 and 2 in connection with FIGS. 3 and 4 show a means 10 and parts thereof, respectively, for cleaning windscreens, window-panes, or optical instruments. The means 10 operating as a linear wiper system comprises a wiper arm 14 supported by a carriage 12 performing reciprocating movements, as well as a gear 18 cooperating with a driving system 16 and actuating the carriage 12. Gear 18 is intended to transform rotary movements into oscillating movements and is connected to, on the driven side, shaft 20 performing oscillating movements.
The shaft 20 is the driving part of a transmission gear 22 for oscillating movements. Part 24 of the gear 22 performing movements on the driven side actuates the carriage 12 through a tensile and/or thrust element 26.
As especially conveyed by FIG. 4, the part 24 performing movements on the driven side is a
REFERENCES:
patent: 3428996 (1969-02-01), Carpenter
patent: 3774477 (1973-11-01), Murphy
patent: 5373605 (1994-12-01), Austin
International Search Report for Application PCT/EP93/02544 filed 20 Sep. 1993.
English Translation for the International Preliminary Examination Report for Appln PCT/EP93/02544.
Mayer Gunter
Scholl Wolfgang
Fenstermacher David M.
ITT Automotive Europe GmbH
Lewis J. Gordon
Marmor Charles A.
Twomey Thomas N.
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