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Chuck members and mechanical pencils

A chuck and component technology, applied in mechanical pencils, printing, writing utensils, etc., can solve problems such as inability to use, and achieve high retention and damage resistance

Active Publication Date: 2017-08-08
MITSUBISHI PENCIL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the resin chuck with a large shape cannot be used for automatic refills with multi-color shafts or mechanical pencils with thin shafts.

Method used

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  • Chuck members and mechanical pencils
  • Chuck members and mechanical pencils
  • Chuck members and mechanical pencils

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0034] Hereinafter, the present invention will be described with reference to the drawings. In addition, the same code|symbol is attached|subjected to the same component in a drawing.

[0035] initial reference figure 1 and figure 2 A structure in which the lead 10 is drawn out in the mechanical pencil 1 will be briefly described.

[0036] figure 1 and figure 2 It is a side sectional view of the mechanical pencil 1 of the present invention. The mechanical pencil 1 has a structure capable of releasing the core 10 , and includes a push part 2 , a core case 3 , a fastener 11 , a chuck 21 , a spring 4 and a holding body 5 . The push part 2 is engaged with the core case 3 . The collet 21 has a fitting end portion 22 fitted to the core case 3 and a split end portion 23 capable of entering and withdrawing from the fastener 11 in the longitudinal direction. Such as Figure 4 As shown, the split end portion 23 of the collet 21 is configured to protrude from the fastener 11 ...

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PUM

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Abstract

The present invention provides a collet member (31), which comprises: a fastener (11), which is a hollow substantially cylindrical fastener (11), having a hole whose diameter is on the axis a tapered inner surface (13) that gradually changes in direction; and a collet (21), which is a collet (21) having a split end (23) split into two or three parts, the split end (23) Accessible relative to the fastener (11) and having a tapered outer surface (24) that contacts the tapered inner surface (13) of the fastener (11) upon entry into the fastener (11), wherein , when the split end (23) of the collet (21) is closed in the fastener (11) and holds the core (10), the tapered outer surface (24) of the collet (21) relative to the collet ( The angle of the central axis of 21) is approximately equal to the angle of the tapered inner surface (13) of the fastener (11) with respect to the central axis of the collet (21).

Description

technical field [0001] The present invention relates to a chuck member for feeding out and holding a lead of a mechanical pencil. Furthermore, the present invention relates to a mechanical pencil including the chuck member. Background technique [0002] In order to release and hold the lead of a mechanical pencil, a chuck member has conventionally been used. As shown in Japanese Patent Application Laid-Open No. 2002-321493, a chuck member includes a chuck and a fastener (fastening ring). The fastener has a hollow substantially cylindrical shape with an inner surface that is straight in the axial direction. The end portion of one side in the longitudinal direction of the chuck is divided. The split end of the collet is capable of entering and exiting relative to the fastener and has a tapered outer surface that contacts the interior surface of the fastener when entering the fastener. As shown in Japanese Patent Application Laid-Open No. 2012-158092, a typical material of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B43K21/22
CPCB43K21/22B43K21/16
Inventor 小泉裕介中山协
Owner MITSUBISHI PENCIL CO LTD
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