Clamping type direct adding and subtracting number-display abacus

Clamping type direct adding and subtracting number-display abacus

  • CN 101,369,169 A
  • Filed: 09/12/2008
  • Published: 02/18/2009
  • Est. Priority Date: 09/12/2008
  • Status: Active Application
First Claim
Patent Images

1. a cassette direct adding and subtracting number-display abacus comprises framework (1), lever (2), last pearl (3), following pearl (7) and crossbeam (4), it is characterized in that:

  • described lever (2) is 3~

    20, be arranged in the framework (1), be installed with pearl (3) on the lever above the crossbeam (4), lever (2) below the crossbeam (4) is provided with groove (9), there is the projection (10) with lever (2) upper groove (9) form fit following pearl (7) both sides, and the projection (10) of following pearl (7) both sides is stuck in the groove (9) of adjacent two levers (2);

    Crossbeam (4) is divided into bead the bead version of " last two times nine ", goes up pearls (3) for promptly top two, below nine following pearls (7);

    Following pearl (7) has two bottom surfaces, indicates " 1~

    9 " nine numerals on the bottom surface (8) of nine following pearls (7) of every grade successively.

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