Setting mechanism for secondary clocks |
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| 申请号 | US3739568D | 申请日 | 1972-02-14 | 公开(公告)号 | US3739568A | 公开(公告)日 | 1973-06-19 |
| 申请人 | BULOVA WATCH CO INC; | 发明人 | VAN HAAFTEN E; | ||||
| 摘要 | A master-secondary clock system in which a master clock having a high order of accuracy, acts to regulate the operation of a plurality of remotely disposed secondary clocks. This is accomplished by means of a direct-current control pulse which is transmitted to the secondary clocks from the master clock, and is received at each secondary clock by an electromagnetic setting mechanism adapted to reset the seconds hand of the secondary clock to bring it into registration with the seconds hand of the master clock. The setting mechanism is also adapted to shift the hour hand of the secondary clock one hour ahead or back, depending on whether a transfer is to be made from Standard to Daylight Savings time or vice versa, this action being effected concurrently with the resetting of the seconds hand, but only when the control pulse is transmitted during a predetermined interval in the course of the day, the direction of shift depending on the polarity of the control pulse. | ||||||
| 权利要求 | 1. A master-secondary clock system provided with a master-clock disposed at a central control station and a plurality of secondary clocks at various remote points, each secondary clock having a seconds hand arbor and an hour hand shaft, a. means at the master station to generate a D-C control pulse and to transmit said pulse to each of said secondary clocks in one polarity or in the reverse polarity; and b. a pulse-responsive setting mechanism associated with each secondary clock, said mechanism being provided with a D-C motor actuating a drive wheel that is caused to turn in a direction determined by the polarity of the incoming pulse which is applied to said motor, said wheel when turning, operating both a seconds hand assembly and an hour hand assembly, said seconds hand assembly including a first lever which, when the wheel is turned in either direction, so engages a first cam mounted on said arbor, as to set the seconds hand to the ''''60'''' position, said hour hand assembly including a second lever which when the wheel is turned in one direction so engages a second cam mounted on said shaft as to advance the hour hand a 1-hour increment and when the wheel is turned in the reverse direction so engages the second cam as to move the hour hand back a 1hour increment, said second cam being so profiled that the second lever is capable of effecting engagement therewith only when the control pulse is transmitted during a predetermined interval in the course of the day. 2. A system as set forth in claim 1, wherein said master clock is a battery-operated tuning-fork movement whose operating frequency is synchronized by pulses derived from a crystal-controlled frequency standard. 3. A system as set forth in claim 1, wherein said secondary clocks are all of the battery-operated tuning-fork type. 4. A system as set forth in claim 3, wherein each of said secondary clocks include a slip clutch interposed between the seconds hand arbor and the tuning-fork timing motor. 5. A system as set forth in claim 1, wherein said D-C motor has a pinion on its shaft engaging the teeth of said drive wheel. 6. A system as set forth in claim 1, wherein said first cam is heart-shaped, and said first lever includes a foot which moves into engagement with said cam when a D-C pulse is transmitted. 7. A system as set forth in claim 6, wherein said first lever is provided with a rectangular extension engaged by one pin on said wheel and a triangular extension engaged by another pin thereon. 8. A system as set forth in claim 1, wherein said second lever is V-shaped to define legs which cooperate with a pair of spaced notches in said second cam, said legs and notches being symmetrically arranged only at one point in time. |
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