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    • 55. 发明授权
    • Drafting device
    • 起草装置
    • US5386640A
    • 1995-02-07
    • US252205
    • 1994-06-01
    • Chiang-Ming ChenKun-Mao Chen
    • Chiang-Ming ChenKun-Mao Chen
    • B43L1/04B43L13/04B43L13/02
    • B43L1/045B43L13/046
    • A drafting device includes a pair of magnetic boards securely mounted to upper and lower surfaces of a base frame respectively, a ruler movably engaged on the magnetic board, a pair of cavities defined in each of the four corners of the lower surface of the base frame, and a protrusion being formed between the pair of cavities. A guiding member is securely mounted to each of the four corners of the base frame and includes a locking block having a first wall member and a second wall member mounted on the upper and lower surfaces of the base frame respectively, a slot being defined in the second wall member through which the protrusion is received, a recess defined in an underside of the locking block between the first and second wall members and having a width equal to the distance between a bottom face of the cavity and the upper surface of the base frame. A guiding line loops around each of the guiding members and passes through two ends of the ruler.
    • 牵引装置包括一对牢固地安装在基架的上表面和下表面上的磁性板,可动地接合在磁性板上的标尺,一对限定在底架的下表面的四个角中的一个空腔 并且在所述一对空腔之间形成有突起。 引导构件被牢固地安装到基架的四个角中的每一个,并且包括锁定块,该锁定块具有分别安装在基架的上表面和下表面上的第一壁构件和第二壁构件, 第二壁构件,突出部被容纳在该第二壁构件中,限定在第一和第二壁构件之间的锁定块的下侧中的凹部,其宽度等于空腔的底面与基架的上表面之间的距离 。 引导线围绕每个引导构件环绕并且穿过尺子的两端。