CN2377251Y - 棱柱活动铅芯 - Google Patents

棱柱活动铅芯 Download PDF

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Publication number
CN2377251Y
CN2377251Y CN 97245273 CN97245273U CN2377251Y CN 2377251 Y CN2377251 Y CN 2377251Y CN 97245273 CN97245273 CN 97245273 CN 97245273 U CN97245273 U CN 97245273U CN 2377251 Y CN2377251 Y CN 2377251Y
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movable lead
writing
lead
prismatic
core
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CN 97245273
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贾云岫
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Individual
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Abstract

本实用新型一种棱柱形活动铅芯,将活动铅芯做成三棱柱形或四棱柱形,其特点是在书写过程中不变钝,书写清晰、不易折断。

Description

棱柱活动铅芯
本实用新型涉及一种棱柱活动铅芯。
现有活动铅芯多为细铅芯,书写不清晰,容易折断。有粗铅芯也是圆柱型的,需要磨锐,用钝后需再磨,既浪费又不方便。
本实用新型的目的是提供一种不易折断、书写清晰、不用磨削即可一直清晰书写的铅笔芯,以克服现有技术中的细铅芯书写不清晰、容易折断而圆柱型粗铅芯需要反复磨削的不足。
本实用新型技术方案为:活动铅芯的形状为三棱柱形或四棱柱形。
活动铅芯的形状可为正三棱柱形。
活动铅芯的形状可为正四棱柱形。
本实用新型的优点为不易折断、书写清晰、不用磨削即可一直清晰书写,直至铅芯用完。
附图1为实施例一的截面图。
附图2为实施例二的截面图。
实施例一,参照图1,活动铅芯的形状为正三棱柱形,其截面为等边三角形。
实施例二,参照图2,活动铅芯的形状为正四棱柱形,其截面为正方形。
使用过程中转动笔杆,轮流用铅芯的各个锐点做书写点,一点磨钝后,它的两个邻点变锐,这样在书写过程中永不变钝,直至用完。

Claims (3)

1.一种棱柱形活动铅芯,其特征在于活动铅芯形状为三棱柱形或四棱柱形。
2.根据权利要求1所述活动铅芯,其特征在于所说的活动铅芯为正三棱柱形,其截面为等边三角形。
3.根据权利要求1所述活动铅芯,其特征在于所说的活动铅芯为正四棱柱形,其截面为正方形。
CN 97245273 1997-09-16 1997-09-16 棱柱活动铅芯 Expired - Fee Related CN2377251Y (zh)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 97245273 CN2377251Y (zh) 1997-09-16 1997-09-16 棱柱活动铅芯

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 97245273 CN2377251Y (zh) 1997-09-16 1997-09-16 棱柱活动铅芯

Publications (1)

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CN2377251Y true CN2377251Y (zh) 2000-05-10

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Family Applications (1)

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CN 97245273 Expired - Fee Related CN2377251Y (zh) 1997-09-16 1997-09-16 棱柱活动铅芯

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CN (1) CN2377251Y (zh)

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