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    • 1. 发明授权
    • Compass
    • 罗盘
    • US4662076A
    • 1987-05-05
    • US734329
    • 1985-05-15
    • Mohammad M. Saadat
    • Mohammad M. Saadat
    • B43L9/02B43L9/18B43L9/00
    • B43L9/025B43L9/18
    • A compass, comprising a sliding rod with a handle at an upper end, and a drawing portion. A slider is slidably mounted on the sliding rod. Two links are pivotally connected to the slider and to the drawing portion at respective first pivot points forming at least approximately a parallelogram. A crank is operatively pivotally connected to the sliding rod and to a center of one of the links at respective pivot points, the crank having a length between its pivot points equal to half the length of the link to which the crank is connected between the first pivot points of the one link.
    • 指南针,包括在上端具有手柄的滑动杆和拉伸部分。 滑块可滑动地安装在滑动杆上。 两个连杆在形成至少大致平行四边形的相应的第一枢转点处枢转地连接到滑块和绘图部分。 曲柄可操作地枢转地连接到滑动杆并且在相应的枢转点处连接到一个连杆的中心,曲柄在其枢转点之间的长度等于连杆的长度的一半,曲柄连接在第一 一个链接的枢轴点。