CN2074246U

CN2074246U - Multi-functional drawing ruler

Info

Publication number: CN2074246U
Application number: CN 90200685
Authority: CN
Inventors: 李作强; 郭春丹; 于兴国; 解耀琛
Original assignee: 李作强
Priority date: 1990-01-22
Filing date: 1990-01-22
Publication date: 1991-04-03

Abstract

The utility model discloses a drawing ruler, composed of a ruler body provided with graduations and a plurality of orifices and a positioning shaft and a graduation disc which are concentrically matched with the ruler body. Overcoming the defect that the ordinary ruler can not draw circles, arcs and ellipses, the utility model has the advantages of simple structure, low cost, small size, extrusion resistance, convenient carrying and multiple functions.

Description

Multi-functional drawing ruler

The utility model is a kind of drawing rule, belongs to measuring instrument, and it comprises blade (1), dial (2) and locating shaft (3).

General ruler or set square can only be drawn the oblique line of straight line and certain angle, as draw also other instruments such as requirement hornwork, compasses of a drawing.A kind of Bekaa isograph is disclosed in CN88218419, its formation be under the blade that has length and angle index, be equipped with one with the long parallel rotating shaft in limit of blade, it can draw horizontal line, vertical line, parallel lines, circle, circular curve and ellipse etc., weak point is a complex structure, volume is bigger, and cost is higher, is afraid of to squeeze not to be stowed under heavy cargo, and the radius of a circle length that can draw series changes less, and inconvenience is carried.

The purpose of this utility model be to avoid above-mentioned weak point of the prior art and provide a kind of simple in structure, volume is less, cost is low, be easy to carry, can draw the more drawing rule of radius of a circle length variations.

The purpose of this utility model can reach by following measure: have a rotation circular hole on the transparent blade (1), make it and locating shaft (3), dial (2) concentric fit, blade (1) is positioned between locating shaft (3) and the dial (2); The cooperation of dial (2) and locating shaft (3) is an interference fit, is matched in clearance between blade (1) and the locating shaft (3), makes blade (1) can do any rotation around locating shaft (3) with respect to dial (2); All there is scale at (1) four limit of blade and middle part at lower surface, and mid portion has an elongated slot upward following parallel with blade (1), and the bottom of groove has scale; A series of diameters are arranged at the bottom of blade (1) is the aperture of φ 2, in order to insert nib draw circles and ellipse, these aperture centers of circle point-blank, the extended line of this straight line is by the center of circle of blade (1) rotation circular hole, and the distance between two adjacent apertures can not be equidistant entirely; The hole that can also bore some φ 2 again around some φ 2 aperture makes that the distance between some φ 2 hole does not wait on these holes and the straight line.The center of circle point-blank between φ 2 holes optimal design of distance be: distance is for 4mm between the AB, being 6mm between the CD, is 7mm between the EF, is 8mm between the GH, all the other adjacent aperture pitch are 5mm, and the distance of OA deducts between 5mm and the BC, distance equates between the DE, between the FG, between the HI.Wherein O is the center of circle of rotation circular hole, and A is the center of circle in first hole, and I is the center of circle of metapore, and B, C, D, E, F, G, H and I respectively are the middle aperture center of circle.Go up the circular hole that can't draw with above-mentioned a series of apertures in addition at blade (1),, make the series of the circle that can draw more continuous as the circle of φ 3, φ 4, φ 5, φ 6, φ 7 and φ 9.Be carved with 0～360 ° angle index on dial (2), it cooperates with the last a certain graduation mark of blade (1), is used for drawing or taking measurement of an angle.Be carved with sign such as point, the cross hairs etc. of its home position of expression at locating shaft (3) lower surface.

If the place makes a circular groove (or half slot) at blade rotation circular hole, and put on angle index and circular groove center of circle sign, can refill high scale dish and locating shaft, its effect and aforesaid drawing rule are similar.

The drawing of accompanying drawing is described as follows:

Fig. 1 is the front elevation of drawing rule.

Fig. 2 is the profile of A1-A1.

Fig. 3 is the profile of B1-B1.

The representative of label among the figure: 1. blade, 2. dial, 3. locating shaft, O, A, B, C, D, E, F, G, H and I represent the point on the blade.

The utility model has the advantages that:

1. can draw horizontal line, parallel lines, vertical line, oblique line, circular arc, circle and ellipse etc.

2. because locating shaft can be done almost thickly with blade, so its volume is little, be not afraid of extruding, easy to carry.

3. simple in structure, cost is low.

Claims

1, a kind of by blade (1), the drawing rule that dial (2) and locating shaft (3) are formed, it is characterized in that: locating shaft (3), rotation circular hole concentric fit on dial (2) and the blade (1), blade (1) is positioned between locating shaft (3) and the dial (2), the cooperation of dial (2) and locating shaft (3) is an interference fit, between blade (1) and the locating shaft (3) is matched in clearance, and a series of φ 2 apertures are arranged at blade (1) bottom, the aperture center of circle point-blank, the extended line of this straight line is by the rotational circle hole circle heart O of blade (1), upper surface at dial (2) is carved with angle index, is carved with the sign such as the cross hairs of expression home position at locating shaft (3) lower surface, the point.

2, drawing rule according to claim 1 is characterized in that on four limits of blade (1) graduation mark being arranged all, and there is an elongated slot upward following parallel with blade (1) at blade (1) middle part.

3, drawing rule according to claim 1 is characterized in that also can boring around some φ 2 hole the aperture of some φ 2.

4, drawing rule according to claim 1 is characterized in that distance can not be equidistant entirely between adjacent φ 2 apertures.

5, drawing rule according to claim 1 and 2 is characterized in that elongated slot bottom has scale.

6,, it is characterized in that to be drilled with on the blade (1) hole of different-diameter according to claim 1 or 3 described drawing rules.

7, drawing rule according to claim 1 is characterized in that the material of blade (1) is transparent.

8, according to claim 1 or 4 described drawing rules, it is characterized in that the center of circle point-blank between φ 2 holes optimal design of distance be: distance is for 4mm between the AB, between the CD 6mm, between the EF 7mm, between the GH 8mm, all the other adjacent aperture pitch are 5mm, and the distance of OA deducts between 5mm and the BC, between the DE, between the FG, distance equates between the HI, wherein O is the center of circle of rotation circular hole, A is the center of circle in first hole, and I is the center of circle of metapore, and B, C, D, E, F, G, H and I respectively are the middle aperture center of circle.