发明名称 Card index
摘要 A card index comprises a housing containing a drawer which holds a stack of punched cards. All the cards have punched holes in which a row of dogs in the bottom of the drawer engage and the cards also have punched selection holes in which selection stop cams can engage. Each card has selection holes in register with all of the stop cams except one. To select a card, a button corresponding to the card is pressed and this rocks a key lever to move the corresponding stop cam downwards. The cam passes through the selection holes in all the cards until it reaches the selected card which has no hole in register with that cam. Accordingly, the selected card and the cards, if any, below are pressed downwards and are held on the dogs. The drawer is released by depression of the button and is opened by a spring. As it opens, the drawer moves the cards which are pressed down on the dogs out of the housing with the selected card on top, but the cards above the selected card are retained in the housing by the stop cam. The arrangement has the great advantage over existing card indexes that it is not necessary to arrange the cards in any particular sequence in the stack in order for them to be correctly selected.
申请公布号 US4254567(A) 申请公布日期 1981.03.10
申请号 US19790093043 申请日期 1979.11.13
申请人 KOLLER, WALTER 发明人 KOLLER, WALTER
分类号 B42F17/34;(IPC1-7):B42F17/18 主分类号 B42F17/34
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