发明名称 |
Drafting device |
摘要 |
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.
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申请公布号 |
US5386640(A) |
申请公布日期 |
1995.02.07 |
申请号 |
US19940252205 |
申请日期 |
1994.06.01 |
申请人 |
CHEN, CHIANG-MING;CHEN, KUN-MAO |
发明人 |
CHEN, CHIANG-MING;CHEN, KUN-MAO |
分类号 |
B43L1/04;B43L13/04;(IPC1-7):B43L13/02 |
主分类号 |
B43L1/04 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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