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  Reverser mechanism for uni-directional rotational driving of a wheel setUSPTO Application #: 20070237035Title: Reverser mechanism for uni-directional rotational driving of a wheel set Abstract: Application to automatic winding by an oscillating weight.
The mechanism includes, mounted to rotate freely on an arbour 6, a driving wheel (5) driven by an oscillating drive pinion (3) and a driven wheel (7) meshed with the first wheel set (1) of a kinematic chain and comprising a dome (11) for housing a coupling device (10) comprising at least one bent locking arm (12) one end (14) of which has a pivoting point (14a, 14b) on the driving wheel (5) and the other end (16) of which has a point of abutment (16a) against the inner wall (2) of the dome (11) of the driven wheel (7) via the action of a spring (20) integral with said arm (12). The pivoting point (14b) preferably moves along a cam (21). (end of abstract)
Agent: Griffin & Szipl, PC - Arlington, VA, US Inventors: Jean-Luc Helfer, Thierry Conus USPTO Applicaton #: 20070237035 - Class: 368147 (USPTO) The Patent Description & Claims data below is from USPTO Patent Application 20070237035. Brief Patent Description - Full Patent Description - Patent Application Claims
[0001]This application claims priority from European Patent Application No. 06007364.0. filed 7 Apr. 2006, the entire disclosure of which is incorporated herein by reference. FIELD OF THE INVENTION [0002]The present invention concerns a reverser mechanism that drives the first wheel set of a kinematic chain in a single direction, whatever the direction of rotation of the drive pinion. Such reverser mechanisms are used in particular for automatically winding the barrel spring of a mechanical watch, or for driving the generator of any small portable electronic apparatus, the drive pinion also being set in movement by an oscillating weight. STATE OF THE ART [0003]Numerous automatic winding devices using an oscillating weight and reverser mechanism have already been proposed. These devices rely on the principles of cam or lever-click mechanisms, gear change mechanisms on two meshed wheels, only one of which is a drive wheel, or roller mechanisms, as disclosed for example in CH Patent No. 305 463, or arms/clicks as disclosed for example in the Japanese Utility Model 18707/72. Such devices have the drawback of being relatively cumbersome and requiring the assembly of quite a large number of parts, and having high friction forces at high speeds when rotating in the authorized direction. SUMMARY OF THE INVENTION [0004]It is thus an object of the present invention to overcome the drawbacks of the aforecited prior art by providing a reverser mechanism comprising a smaller number of parts to be assembled and thus able to be produced at a lower cost, while having a higher or equal performance to that of the devices of the prior art. [0005]Thus the reverser mechanism, inserted between the first wheel of a kinematic chain that has to be driven in a single direction and the drive pinion that has an alternate motion, comprises a driving wheel mounted on an arbour of rotation above a driven wheel mounted on the same arbour and meshed, directly or indirectly, with the first wheel of the kinematic chain. The driven wheel comprises a dome open towards the driving wheel for housing a coupling device, made of a resilient material, for coupling/uncoupling the two wheels as a function of the direction of rotation of the drive pinion. The coupling device is characterized in that it comprises at least one bent locking arm, one end of which has a pivot point on the driving wheel and the other end of which has a point of abutment against the inner wall of the dome of the driven wheel under the action of a spring that is integral with said arm. [0006]According to a first embodiment, the arm pivots about a fixed arbour secured to the driving wheel, and according to a second embodiment, which will be explained in more detail hereinafter, the pivot point can move along a cam secured to the driving wheel. [0007]In this "single direction" mechanism, and particularly in the second embodiment, providing a guide extension on the locking arm giving a third positioning point of said locking arm, a balance extension for reducing, or removing the unbalance, and/or a security device limiting the travel of the pivot point along the cam in case of too violent clearances, can further improve the working of the mechanism. [0008]The reverser mechanism briefly described above is called a "single direction" mechanism because it only drives for one alternation of the drive pinion. It is however possible to have a "double direction" reverser mechanism by coupling two "single direction" reverser mechanisms having reverser coupling devices. In a preferred embodiment, the two reverser mechanisms are superposed and the two driven wheels form a single piece. BRIEF DESCRIPTION OF THE DRAWINGS [0009]Other features and advantages of the present invention will appear in the following description of various embodiments, given by way of non-limiting illustrative, with reference to the annexed drawings, in which: [0010]FIG. 1 is a perspective view of a first embodiment; [0011]FIG. 2 is a broken cross-section along line II-II of FIG. 1; [0012]FIG. 3 is a cross-section of a variant of the first embodiment; [0013]FIG. 4 is a perspective view of a second embodiment; [0014]FIG. 5 is a broken cross-section along line V-V of FIG. 4; [0015]FIG. 6 shows in perspective a first variant of the second embodiment; [0016]FIG. 7 shows in perspective a second variant of the second embodiment; [0017]FIG. 8 shows in perspective a third variant of the second embodiment; [0018]FIG. 9 shows in perspective a fourth variant of the second embodiment; [0019]FIG. 10 shows a simplified top view of the coupling device prior to assembly; [0020]FIG. 10A shows a construction detail of FIG. 10; Continue reading... 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