CN2083119U - 护芯卷笔刀 - Google Patents

护芯卷笔刀 Download PDF

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Publication number
CN2083119U
CN2083119U CN 90226029 CN90226029U CN2083119U CN 2083119 U CN2083119 U CN 2083119U CN 90226029 CN90226029 CN 90226029 CN 90226029 U CN90226029 U CN 90226029U CN 2083119 U CN2083119 U CN 2083119U
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pencil sharpener
lead
pencil
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CN 90226029
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曾辉
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Abstract

一种护芯卷笔刀,主要利用橡胶或软塑料具备的 一定承受能力和合适的容让性,将橡胶或软塑料护芯 垫粘贴地安装在普通卷笔刀笔尖出口的凹处,护芯垫 的锥形槽面与卷笔刀笔芯切削处表面平滑连接。锥 形槽的后端部直径与卷笔刀小孔直径相同。本实用 新型能解决目前市场上出售的卷笔刀极易断笔芯的 缺点,同时能为国家节省大量因铅笔削时断芯而浪费 的木材。

Description

一种护芯卷笔刀,本实用新型属于文化用品。
铅笔卷笔刀是学前班、小学一、二年级学生的必备品,由于现在市场上出售的卷笔刀极易断芯,特别是笔杆木材质量稍次的铅笔很难卷削好。原因是卷笔刀在卷削铅笔时,当卷削到笔芯位置时,笔芯右边受刀刃的切削扭力,而左边呈悬臂状态,铅笔笔芯实际是由石墨制成,具有脆性,因而易断。
针对上述缺点,一方面为了减轻学生在这方面的负担,另一方面为了能使国家节省大量因铅笔卷削时断芯而浪费的优质木材,特作出本实用新型。
本设计主要利用橡胶或软塑料具备的一定承受能力和合适的容让性,将橡胶或软塑料护芯垫粘贴地安装在普通卷笔刀笔尖出口的凹处,护芯垫的锥形槽面与卷笔刀笔芯切削处表面平滑连接,锥形槽的后端部直径与卷笔刀小孔直径相同。
下面结合附图对本实用新型作具体说明:
图1、护芯垫正视图
图2、护芯垫侧视图
图3、护芯卷笔刀的安装图
橡胶或软塑料护芯垫1的锥形槽后端部2的直径与卷笔刀小孔直径相同,以保证安装时锥形槽面与卷笔刀笔芯切削处表面平滑连接,便于笔芯部分前进。锥形槽底部母线与护芯垫上平面夹角α为25°,但锥形槽的锥度β应在25°~30°之间。锥高H略小于铅笔笔芯卷削后笔芯的锥高,以保证卷削时铅笔芯与橡胶之间无缝隙,形成橡胶对 笔芯的弹性反力与笔芯右边切削刃的平衡。护芯垫前半部开有宽度为0.5毫米的狭缝3,在卷削时使橡胶产生足够的容让性,保证笔芯不被碰断。
厂家可按上述结构制造护芯卷笔刀,或制造护芯垫与普通卷笔刀配套使用。

Claims (2)

1、一种护芯卷笔刀,其特征在于将橡胶或软塑料护芯垫1粘贴地安装在普通卷笔刀4的笔尖出口的凹处,护芯垫1的锥形槽面与卷笔刀4笔芯切削处表面平滑连接,锥形槽后端部2的直径与卷笔刀4小孔直径相同。
2、根据权利要求1所述的护芯卷笔刀,其特征在于护芯垫1锥形槽的锥度β为25°~30°,护芯垫1的前半部开有宽度为0.5毫米的狭缝3。
CN 90226029 1990-12-14 1990-12-14 护芯卷笔刀 Withdrawn CN2083119U (zh)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 90226029 CN2083119U (zh) 1990-12-14 1990-12-14 护芯卷笔刀

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 90226029 CN2083119U (zh) 1990-12-14 1990-12-14 护芯卷笔刀

Publications (1)

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CN2083119U true CN2083119U (zh) 1991-08-21

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CN 90226029 Withdrawn CN2083119U (zh) 1990-12-14 1990-12-14 护芯卷笔刀

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CN (1) CN2083119U (zh)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108819564A (zh) * 2018-09-17 2018-11-16 彭子涵 一种铅笔加长笔筒

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108819564A (zh) * 2018-09-17 2018-11-16 彭子涵 一种铅笔加长笔筒
CN108819564B (zh) * 2018-09-17 2019-08-20 彭子涵 一种铅笔加长笔筒

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