发明名称 Teaching aid for reading an horological clock
摘要 A first shaft is rotatably supported centrally of a clock face having horological divisions placed in sequential arcuate relation thereon. A second shaft concentric with said first shaft is rotatably supported independently of said first shaft and has attached thereto a minute hand. A first disc is in rotatably driven relation to the first shaft and is positioned nextly adjacent the back side of the clock face. The first disc carries a first set of digital numerals corresponding to the hourly horological division. The clock face has a window formed thereon and the digital numerals are registrable with the window and viewable therethrough. A second disc having a diameter an increment larger than the diameter of the first disc is rotatably driven by the second shaft and carries a second set of digital numbers corresponding to the horological minute division. The second set of numbers is registrable with the clock face window and viewable therethrough.
申请公布号 US4102060(A) 申请公布日期 1978.07.25
申请号 US19760752434 申请日期 1976.12.20
申请人 BERRY, RONALD G. 发明人 BERRY, RONALD G.
分类号 G09B19/12;(IPC1-7):G09B19/12 主分类号 G09B19/12
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