CN2435245Y

CN2435245Y - Maths drawing ruler

Info

Publication number: CN2435245Y
Application number: CN 00223932
Authority: CN
Inventors: 李正雄
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-08-10
Filing date: 2000-08-10
Publication date: 2001-06-20
Anticipated expiration: 2010-08-10

Abstract

The utility model relates to a synthetic plotting sector of mathematics, which belongs to stationery. The utility model is a multifunctional plotting tool combining a ruler and a pair of compasses. The sector is provided with a gear and a rack bar which are engaged, the gear is fixed on a rotary sleeve and the rack bar is fixed on an upper slide ruler and connected with a clamping slide block of a lead cord. When the compasses are rotated for plotting, the lead cord simultaneously rotate and do a rectilinear motion, so that curved lines can be drawn. The slide rulers can be combined into various geometrical figures through varying the connection on a regulating tank. The utility model has the advantage of simple structure and portability, and can draw a plurality of mathematical fundamental figures.

Description

The mathematical synthesis drawing ruler and gauge

The utility model belongs to stationery, particularly has the ruler of multiple function and the combination drawing tool of compasses.

Conventional drawing instrument has ruler, set square, protractor, compasses etc., the function singleness of various apparatus, but that the student must get all the ready is stand-by.If will paint the figure of special angle, just must cooperate use by several instruments, mapping is trouble, and the time ratio of cost is more, and error is also bigger; If will draw ellipse, hyperbola, parabola, above-mentioned instrument is difficult to meet the demands; Many drawing instruments carry and manage inconvenience in addition, and average price is higher during purchase.The inventor had once declared background mathematics and had used chi, application number 97211701.6, solve the geometric figure of drawing the combination of multiple straight line and the problem of understanding part common mathematical formula, but can not be used for trace, the particularly common figures of middle school mathematics such as ellipse, hyperbola, parabola.

The purpose of this utility model provides a kind of multi-functional ruler, it is simple in structure, cost is low, use is easy, easy to carry, can paint multiple common geometric figure quickly, also can draw ellipse that common drawing tool is difficult to picture, hyperbola, parabola etc.

The realization the technical solution of the utility model is: with the slide rule group of the disclosed middle part of ZL97211701.6 band regulating tank, and the compasses that the conventional line arm of deciding arm and band lead for retractable pencil by band center of circle pin is formed are the basis, do following the improvement, 1. deciding arm is placed among the rotation set, be fixed with perpendicular telescopic arm on the rotation set, the other end of telescopic arm connects the line arm, and line arm lower end connects a hollow rails shell, is equipped with lead for retractable pencil card slide block in the rail shell; 2. the rotation set lower end is fixed with gear, is fixed on the slide rule with the tooth bar of this gears engaged, and tooth bar is connected with lead for retractable pencil card slide block, and compasses are decided the regulating tank of center of circle pin by the slide rule middle part on the arm.In the time will drawing the geometrical pattern that straight line is combined into, available slide rule spelling picks out the figure that needs, and fixes in the regulating tank intersection of slide rule again, just can draw; When desire is drawn circumference, directly just can draw with the compasses part; If will draw curves such as ellipse, hyperbola, parabola, the tooth bar that gear on the compasses rotation set and last slide rule is fixing meshes, and tooth bar is connected with lead for retractable pencil card slide block, and required pattern just can draw.

Below, the specific embodiment of the present utility model according to Figure of description provides is further described its detailed structure.

Fig. 1 is a structural representation of the present utility model;

Fig. 2 is rail shell of the present utility model and lead for retractable pencil card slide block structure schematic diagram;

Fig. 3 is the utility model gear, tooth bar mesh schematic representation.

Referring to each figure, the arm 1 of deciding of compasses is placed among the rotation set 4, the top of rotation set 4 is fixed with perpendicular telescopic arm 5, the other end of telescopic arm 5 connects line arm 2, and line arm 2 lower ends connect a hollow rails shell 6, are equipped with lead for retractable pencil card slide block 7 in rail shell 6, lead for retractable pencil card slide block 7 is the two halves of symmetry, lead for retractable pencil 3 is clamped at the seam crossing of two halves, and the side trough of belt 8 of lead for retractable pencil card slide block 7, with on the rail shell 6 with positioning strip 9 be entrenched togather (seeing Fig. 1,2 for details); Rotation set 4 lower ends are fixed with gear 10, when when drawing the user mode of curves such as ellipse, be fixed on the slide rule 12 with the tooth bar 11 of these gear 10 engagements, the end of tooth bar 11 is connected with lead for retractable pencil card slide block 7, the center of circle pin 14 that compasses decide to fix arm 1 lower end passes through the regulating tank at upper and

lower slide rule

12,13 middle parts, is inserted on the drawing paper and (sees Fig. 1,3).Going up slide rule 12 when guaranteeing curve such as picture ellipse does not have and rocks, simultaneously avoid again being pressed tension and influence slippage, compasses are decided arm 1 upper end spring 15 are housed, and are pressed on the rotation set 4, it is threaded and be furnished with nut 16 to decide the lower end of arm 1, and nut 16 links into an integrated entity compasses and upper and

lower slide rule

12,13.

In the time will drawing the figure of rectilinear(-al),, fix and get final product with screw, nut by regulating tank again as long as splice with the upper and

lower slide rule

12,13 of slide rule group; When drawing bowlder, use the compasses part separately, regulate telescopic arm 5 to appropriate length, locking gets final product again; If in the time of will drawing ellipse, insert the regulating tank at

slide rule

12,13 middle parts with deciding arm 1, fixing with nut 16, gear 10 and tooth bar 11 engagements, the end of tooth bar 11 connects lead for retractable pencil card slide block 7, when rotating rotation set 4 mappings, under gear, rack for transmission, lead for retractable pencil gradually changes apart from the distance in the center of circle, 1/4th the elliptic arc that at every turn can draw, and four times cocoa draws whole oval.

From technique scheme of the present utility model, it is simple in structure, cost is low, use is easy, easy to carry, can paint multiple common geometric figure quickly, also can draw ellipse that common drawing tool is difficult to picture, hyperbola, parabola etc.

Claims

1, a kind of mathematical synthesis drawing ruler and gauge is made up of the line arm of deciding arm and band lead for retractable pencil of band center of circle pin, it is characterized in that:

1. decide arm and be placed among the rotation set, be fixed with perpendicular telescopic arm on the rotation set, the other end of telescopic arm connects the line arm, and line arm lower end connects a hollow rails shell, is equipped with lead for retractable pencil card slide block in the rail shell;

2. the rotation set lower end is fixed with gear, is fixed on the slide rule with the tooth bar of this gears engaged, and tooth bar is connected with lead for retractable pencil card slide block, and compasses are decided the regulating tank of center of circle pin by the slide rule middle part on the arm.

2 by the described mathematical synthesis drawing ruler and gauge of claim 1, it is characterized in that on compasses decide arm spring being housed, and is pressed on the rotation set, and it is threaded and be furnished with nut to decide the arm lower end, and nut links into an integrated entity compasses and upper and lower slide rule during the trace state.