CN2186664Y

CN2186664Y - Rectangle pencil lead specially for drawing

Info

Publication number: CN2186664Y
Application number: CN 94210523
Authority: CN
Inventors: 刘自鸣
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-04-29
Filing date: 1994-04-29
Publication date: 1995-01-04
Anticipated expiration: 2004-04-29

Abstract

The utility model relates to a rectangular pencil lead core specially for drawing, which is composed of length, width, thickness and the radian of the rounded corner of the edge of the lead core. The utility model has the advantages of novel design, simple structure, strong practicability, material saving, convenient operation, etc. The utility model increases drawing efficiency obviously. The utility model is an ideal drawing tool for drawing pencil drafts in mechanical engineering at present.

Description

Rectangle pencil lead specially for drawing

The utility model belongs to the drawing pencil pen core, belongs to the special-purpose rectangle pencil pen core of drawing more precisely.

At present, draw engineering drawing and generally all be to use circular pencil pen core, engineers and technicians are before drawing, must be whittled into rectangle to circular pencil pen core, pen core after cutting is actual to be to be rectangular wedge shape, wearing and tearing meeting with its cross section in drawing course is drawn thicker and thicker, thereby causes the graph line thickness of drawing inconsistent, does not reach standardizing standardization.If guarantee the requirement that its drawing line weight is consistent all the time, also must in drawing, the constant pencil pen core is repaiied cut, this not only increases the waste of non-cutting time and pen material for drawing because of repairing the pen core that sharpens a pencil, and brings many inconvenience to drawing work again.

The purpose of this utility model is for overcoming the problem of above-mentioned existence, having designed the special-purpose rectangle pencil of a kind of novel drawing pen core.Changing traditional cylindrical drawing pencil pen core is rectangle, has overcome the problem of above-mentioned existence preferably.

Design considerations of the present utility model and its shape and structure according to State Standard of the People's Republic of China GB4457.4-84 " mechanical drawing figure line " requirement, have designed the special-purpose rectangle pencil of a kind of novel drawing pen core.Can be made into by its purposes: various pencil-leads such as B, 2B, 3B, 4B, 5B, 6B, HB, H, 2H, 3H, 4H, 5H, 6H.Its processing length is not limit, and joint length is 175mm, and the width b on long limit is 3mm, and the thickness a of minor face is 0.7-2.1mm, and the radius of the radian R at its edge is 1.5mm.During use, can swathe pencil-lead with wooden penholder or paper as required; And also can the improvement garden shape and the use of its coupling of rule pencil pin geometrical clamp mouth.This rectangle pen core can be used for picture heavy line, fine line, dotted line, thick chain-dotted line, thin dashed line, double dot dash line.

The utlity model has good social and economic benefit.This rectangle pencil pen core has modern design, simple in structure, practical, labor and material saving, easy to use, significantly improve characteristics such as drawing operating efficiency.

The utility model embodiment provides in conjunction with the accompanying drawings:

Fig. 1 is the special-purpose rectangle pencil pen core shape and structure schematic diagram of drawing.

Among the figure: 1 length, 2 width, 3 thickness, 4 radians.

Fig. 2 is the special-purpose rectangle pencil pen core view of drawing.

Among the figure: L is that length, a are that thickness, b are that width, R are radian.

Among the figure length L of rectangle pen core (1) add do not limit joint length L(1 man-hour) should be 175mm, its broadside width (2) is 3mm, short thickness a(3) be 0.7～2.1mm, the garden radian R(4 of two minor face thickness sides) radius is 1.5mm.Swathe pen core with wooden penholder or paper; Improvement garden rule pencil pin geometrical clamp degree of lip-rounding shape and its coupling are used.

Claims

The special-purpose rectangle pencil of a kind of novel drawing pen core, it is according to State Standard of the People's Republic of China GB4457.4-84 " mechanical drawing figure line " requirement, employing is made up of length and width, thick and angle, garden radian, rectangle pencil pen cores such as B, 2B, 3B, 4B, 5B, 6B, HB, H, 2H, 3H, 4H, 5H, 6H, it is characterized in that its processing length do not limit, single length should be 175mm, width is 3mm, thickness is 0.7～2.1mm, garden, two thickness edges arc radius is 1.5mm, swathes with wooden penholder or paper and uses and change the use that is complementary of garden rule pencil pin geometrical clamp degree of lip-rounding shape.