Rotary stepping mechanism with cylinder lock arrangement |
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| 申请号 | US33841373 | 申请日 | 1973-03-05 | 公开(公告)号 | US3813952A | 公开(公告)日 | 1974-06-04 |
| 申请人 | KIENINGER & OBERGFELL; | 发明人 | FEHRENBACHER W; | ||||
| 摘要 | A toothed-wheel mechanism for clocks or like small-size precision devices (e.g., stepping mechanisms) comprises a first (driven) toothed wheel having a tooth periphery extending all around the same at least in one plane of the toothed wheel, thereby forming a gear thereof. In another plane thereof, the periphery is formed with gaps flanked by respective teeth, preferably with two or more foreshortened teeth being disposed between successive gaps. A second (driving) toothed wheel is provided with a cylinder segment receivable in the gaps and extending over only part of the periphery thereof of the second wheel while a tooth segment extends over another portion of the periphery of this second wheel for mating engagement with the intergap teeth of the first wheel and of the same intertooth spacing or pitch. The teeth flanking the gap receiving the cylinder segment lie tangent thereto so that the first wheel is immobilized while the cylinder segment of the second wheel is received in a gap of the teeth of the first. | ||||||
| 权利要求 | 1. A stepping mechanism with cylinder locking comprising a driving toothed wheel and a driven toothed wheel mesing therewith and adapted to be angularly stepped through a fraction of a complete revolution for each revolution of said driving wheel, said driving wheel being formed with a toothed segment lying at least in one plane perpendicular to the axis of rotation of the driving wheel and extending over a portion of the periphery thereof and with a cylinder segment lying in another plane perpendicular to said axis and extending substantially over the remainder of said periphery, said driven wheel being formed with a periphery array of gear teeth of substantially the same pitch as that of said toothed segment and constituting a gear from said driven wheel, said array being provided with angularly spaced gaps adapted to receive said cylinder segment and lock said driven wheel against rotation said gaps being defined between teeth of said array tangentially embracing said cylinder segment upon its reception in the respective gap. 2. The stepping mechanism defined in claim 1 wherein said gap-defining teeth are formed with gear-tooth flanks tangentially engaging said cylinder segment upon receipt of the cylinder segment in the respective gap. 3. The stepping mechanism defined in claim 2 wherein said gap-defining teeth extend transversely to said planes and bridge the latter. 4. The stepping mechanism defined in claim 3, further comprising n teeth on said driven wheel disposed between each pair of teeth defining a respective gap and clearing said cylinder segment upon receipt thereof in the latter gap, but engageable with a corresponding number n of teeth of said driving wheel beyond a common axial plane of said wheel upon entrainment by said driving wheel of said driven wheel. 5. The stepping mechanism defined in claim 4 wherein said cylinder segment is formed With end flanks constituting extensions of inner gear-tooth flanks of the outer teeth of said tooth segment. 6. The stepping mechanism defined in claim 1 wherein said wheels are unitarily injection molded from synthetic resin. 7. The stepping mechanism defined in claim 6 wherein said toothed wheels have a common axial plane, said driven wheel comprises a plurality of long gear teeth constituting said gap-defining teeth and disposed between the gaps along the periphery of said driven wheel, said long teeth extending substantially the full thickness of said driven wheel, a tooth of intermediate length disposed between the gap-defining teeth of each gap, and a tooth of short length disposed between the tooth of intermediate length and one of the gap-defining teeth of each gap, said driving wheel being formed with a short-length tooth within the arc subtended by said cylinder segment and axially offset therefrom and adapted to clear said short-length tooth of a respective gap upon relative rotation of said driving wheel and said driven wheel until the short-length tooth of said driving wheel engages the intermediate-length tooth of said driven wheel at a location beyond said common axial plane in the sense of rotation of said driving wheel. 8. The stepping mechanism defined in claim 7 wherein said tooth segment comprises four gear teeth bridging said plane axially and said short-length tooth, said driven wheel comprises 20 teeth subdivided into four groups and including one long tooth, one intermediate length tooth and one short-length tooth in addition to two further long teeth, the cylinder segment being receivable between a pair of long teeth receiving the intermediate-length and short-length teeth of the respective group between them. |
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