CN2260008Y - Multi-function ruler for drafting - Google Patents

Abstract

The utility model relates to a multifunctional drawing ruler which is composed of a rectangular board with scales, a protractor in the rectangular board, a winding small wheel arranged on one side of the protractor, a compass which is installed in the rectangular board, etc. The utility model has the characteristics of simple structure, easy production, low cost, many functions, wide market prospect, etc., and is suitable for wide teachers, students and scientific and technical personnel to use.

Description

Multifunctional drawing ruler

The utility model belongs to a kind of drawing instrument.

Existing drawing ruler function is all more single, the drawing ruler that is integrated in one of the multiple mapping function of handlebar seldom, use the drawing ruler of this simple function, cumbersome during mapping, draw a width of cloth figure and often will frequently change multiple drawing tool, various drawing tools such as compasses, ruler, protractor, curve ruler have been occupied on the desk, very inconvenient, bring and change, both wasted the time, disperseed energy again, the operating efficiency of mapping is not high.

The purpose of this utility model is the defective at above-mentioned drawing tool function singleness, a kind of multifunctional drawing ruler that integrates multiple mapping function of design.

The method that the utility model is finished is the rectangular slab middle part that a periphery is had master scale, make hollow protractor, be carved with master scale around the protractor, rotatable small wheels is installed in protractor straight flange one side, small wheels and inelastic fine rule adapted, there is the compass of master scale to be installed in place, the arbitrary angle of rectangular slab, the drawing ruler of like this finishing, except that function with common ruler, also have and be used for straight line, circle, the ellipse that becomes any angle with known straight line, and can be used to measure the size at angle, replace the effect of protractor.Utilize the direction of the compass indication on this drawing ruler constant all the time, the scale of the angle of multifunctional drawing ruler rotation and the pointer indication of compass is this relation one to one, just can make straight line at any angle with this drawing ruler.Become 30 angles of spending with known straight line A such as finishing straight line B, as long as it is overlapping certain limit of this drawing ruler and known straight line A, and write down the scale of compass indication, then clockwise or be rotated counterclockwise this drawing ruler, absolute value up to the new scale of the pointed of compass and the difference of the scale of writing down originally is 30 degree, the straight line that draws on this limit of this drawing ruler then, this line is the straight line B that is asked.Draw if utilize this drawing ruler, earlier bifocal C1 and C2 are moved on to center of circle O, suitably the little line of rotation is taken turns again, and making the line length between bifocal C1 and the C2 is drawn diameter of a circle, be the center of circle then with O, with half of C1 and C2 line length is that radius is drawn semicircle, and this semicircle is the round semicircle of asking, again multifunctional drawing ruler Rotate 180 degree, with identical circle is the center of circle, with identical radius is radius, and another the round semicircle of asking that can draw, this circle are institute and ask.If it is oval to utilize this drawing ruler to draw, earlier according to the oval known conditions of ask, obtain this long axis of ellipse a and focal length c, be the center of drawn ellipse then with this drawing ruler O, bifocal C1 of this drawing ruler and C2 are moved on to the oval focus place that asks, rotate little line wheel then, making the line length between bifocal C1 and the C2 is the twice of the long axis of ellipse of asking, be 2a, then with the pen with the line of bifocal stretching be principle, oval half asked of can drawing again this drawing ruler Rotate 180 degree, can be made institute with identical method and be asked second half of ellipse.

The utility model has the advantages that: simple in structure, to make easily, product cost is low; Function is many, except that function with common ruler, also has multiple mapping function, can be used for straight line, circle, ellipse at any angle, also have the effect of protractor, suitable teachers and students big, special secondary school impart knowledge to students to chart and use, also be suitable for the numerous engineers and technicians use of drawing, widely applicable, market prospects are wide, can produce good economic benefit and social benefit.

Accompanying drawing is an agent structure schematic diagram of the present utility model.

Most preferred embodiment of the present utility model is: protractor (9) has been done at the middle part at the rectangular slab (8) that is carved with master scale (1), (3), the periphery of protractor has master scale (2), (7), rotatable small wheels (5) is installed in protractor straight flange one side, be wound with the nonelastic fine rule (6) of mapping usefulness above, compass (4) is installed in the rectangular slab, and O is the center of circle of protractor.

Claims (1)

1, a kind of multifunctional drawing ruler, comprise the protractor compass, protractor (9) has been done at the middle part of the rectangular slab (8) of (1) (3) that it is characterized in that master scale is arranged, and is installed in protractor straight flange one side with the small wheels (5) of fine rule (6) adapted, and compass (4) is installed in the rectangular slab.