CN2411463Y

CN2411463Y - Multipurpose drawing board

Info

Publication number: CN2411463Y
Application number: CN 99212992
Authority: CN
Inventors: 李庆祥
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-06-10
Filing date: 1999-06-10
Publication date: 2000-12-20
Anticipated expiration: 2009-06-10

Abstract

The utility model belongs to a drawing board, which is especially suitable for students and office workers. The drawing board is that a protractor, a pair of compasses and a parallel ruler are arranged on a triangular plate made of organic glass, scale marks of 0 DEG and 180 DEG of the protractor are arranged on the bottom edge of the protractor, and a ruler is carved. The compasses and the parallel ruler are formed by drilling on the triangular plate, a hard nib is penetrated through a selected compass hole to drive the triangular plate to turn around the center of a circle for a circle, and then the needed circle with definite radius is obtained. The hard nib is penetrated through a parallel hole to drive the triangular plate to slide along a straight-sided member, a straight line totally can be drawn, the straight lines are mutually parallel, and intervals between the straight lines can be freely selected.

Description

A kind of multipurpose drawing board

The utility model relates to a kind of plotting sheet, especially collects right angle triangle, and protractor, compasses, parallel rule are in the plotting sheet of one, and the most suitable student of this plotting sheet, clerk and industrial art person use.

Protractor, compasses, parallel rule are arranged on set square or other plotting sheets, also have before this, but these protractors, compasses (being picture circle template in fact), parallel rule all also have weak point, such as on 0 °, the 180 ° reticules of protractor or do not have ruler, even ruler is arranged, the length of its ruler also only limits to the semicircle scope of protractor.Normally used compasses all are two legs, and this compasses must be measured radius by other ruler, and this compasses cause drawn circle nonstandard in use if undue force can make the bipod distortion.Being arranged on the picture circle template on the plotting sheet, is some circular holes that differ in size, and a circular hole decision can only be drawn a circle, and on a template such circular hole to be set be limited.Present existing a kind of parallel rule that draws parallel lines, be two places on a limit of ruler or other plotting sheets, be carved with the ruler of equal length unit respectively inwards, measuring line-spacing with these two rulers draws parallel lines, draw parallel lines with this parallel rule, remain line of picture with regard to mobile ruler once, mobile ruler once will be measured line-spacing once, not only use inconvenience, and make mistakes easily.

The purpose of this utility model is to provide a kind of simple structure, cheap, easy to use, the drawing instrument accurately of mapping for the user.

Below in conjunction with accompanying drawing to the utility model elaborate (figure one is a vertical view of the present utility model, and figure two is each purposes part exploded view of the present utility model, and figure three is circle center piece longitudinal sections).

The utility model is the drawing board that integrates right angle triangle (1), protractor (2), compasses (3), parallel chi (4), This drawing board is made by transparent organic glass. Right angle triangle (1) is the common of protractor (2), compasses (3), parallel chi (4) Carrier, namely protractor (2), compasses (3), parallel chi (4), all be on it by groove, carve numeral, hole and establish Put that parts form.

Protractor (2) is near the hypotenuse of right angle triangle (1), and does the base of protractor (2) with this hypotenuse.0 °, 180 ° reticules of protractor (2) overlap with the base of protractor (2), and the angle point of estimating one's own ability is carved with two rulers of equal length unit respectively to 0 °, 180 ° directions, the semicircle scope of the length plussage hornwork of these two rulers is directed reach the two ends of right angle triangle (1) hypotenuse.These two rulers are the length that is used for measuring setting-out when mapping, with a centimetre chi optimum.

Compasses (3) are made up of circle center piece (5), radius chi (6) and several compasses holes that is similar to compasses hole (7).Circle center piece (5) is made up of rubber cap (11), steel pricker (12), circle center hole (13).Circle center hole (13) is that the disposable profile of casting of moulding is when moulding casting right angle triangle (1)

Aperture, its pore size is twitched up and down with proper enough steel pricker (12) and is advisable.During the assembling circle center piece, the neck with steel pricker (12) packs into the suitable for reading of rubber cap (11) earlier, steel pricker (12) is inserted in the circle center hole (13) again, and the back is cemented on the right angle triangle (1) with the Xia Pingkou of powerful viscose glue with rubber cap.During use, a finger is pressed steel pricker (12), the awl point just nail below paper or other objects on and become the center of circle.Holding hard-tipped pen penetrates selected compasses hole with nib on the other hand, driving whole plotting sheet rotates more than the week around the center of circle, the track of hard-tipped pen point promptly is the circle that will draw, after painting, unclamp the finger of pinning steel pricker (12), steel pricker (12) because of the elastic force of rubber cap (11) by pop into position, avoid hanging the paper of hindering below it.The radius of a circle that draws by each compasses hole is indicated by radius chi (6) and this precedence of compasses hole below the radius chi.For example, the radius of a circle that draws by compasses hole (7) is 3.7 centimetres.The setting in compasses hole be play the center of circle from distance center of circle certain distance (I is little of 0.5 centimetre) unit length of the every increase of distance (as required, this unit length can be little of 0.05 centimetre) hole is set, the size in hole can penetrate with general hard-tipped pen point and be advisable, and want wide up and down, middle narrow, be Type.For ease of making, two adjacent holes are drawn back on camber line, and its two compasses distance between borehole is reached more than 0.5 centimetre, and these compasses holes are when moulding casting right angle triangle (1), once to mould and cast type.

Parallel rule (4) is made up of parallel lines carpenters square (8), parallel baseline (9) and several parallel lines holes of being similar to parallel lines hole (10).Parallel baseline (9) is parallel to the base (one side vertical with the parallel lines carpenters square) of plotting sheet.The setting in parallel lines hole is from parallel baseline (9), and unit length of the every increase of distance vertically downward (as required, this unit length can be little of 0.05 centimetre) is provided with a hole.The size in hole can penetrate with general hard-tipped pen point and be advisable.And want wide up and down, middle narrow, be

Type.For ease of making, two adjacent holes are drawn back on parallel lines, and its two distance between borehole is reached more than 0.5 centimetre.These parallel lines holes are when moulding casting right angle triangle (1), once mould and cast type.Earlier plotting sheet just is being placed on the paper or other objects that will map during use, use the base of a ruler again near plotting sheet, hold hard-tipped pen on the other hand, nib is penetrated selected parallel lines hole, draw whole plotting sheet to slide along ruler, the track of nib is exactly article one straight line that will draw, when drawing the second parallel lines, plotting sheet is returned the original place along ruler, find the parallel lines hole of required second parallel lines, operation above repeating, the second parallel lines have just come out.Carry out so repeatedly, can draw some parallel lines,, need the sample different in size of each bar parallel lines, then the ruler below the parallel lines hole and determined the starting point of each bar line and terminal point just near the ruler of this ruler if resemble tabulation lattice and so on.If the parallel lines of drawing are more, in the time of need controlling the position of ruler again, first mobile plotting sheet makes that parallel lines baseline (9) overlaps with the last item parallel lines that just painted on the plotting sheet, by tight plotting sheet, again with ruler near the base of plotting sheet by tightly just having continued the parallel lines below the picture.With the parallel lines that this parallel rule draws, the distance between its adjacent two parallel lines is read to calculate in the precedence on parallel lines carpenters square (8) the right by parallel lines carpenters square (8) and this two parallel lines holes.For example: by the parallel lines that draw in parallel lines hole (10) and parallel lines hole (14), its distance between centers of tracks is: 4.8 centimetres-3.3 centimetres=1.5 centimetres.

According to above-described the utility model---multipurpose drawing board, be to existing protractor, compasses, parallel rule, all improved after, again they are arranged on the right angle triangle, not only use conveniently, accurately than existing protractor, compasses, parallel rule, and purchase cost reduces greatly, only need to produce four drawing instruments, reach the purpose of this utility model a little more than the manufacturing cost of equal big or small set square.

Claims

1. a kind of transparent organic glass plotting sheet, it is characterized in that the right angle triangle (1) with this plotting sheet is a carrier, on right angle triangle (1), there is one near the set square hypotenuse, the protractor (2) that two rulers are arranged above, with by circle center piece (5), radius chi (6), be similar to the compasses (3) that several compasses holes in compasses hole (7) are formed, and by parallel lines carpenters square (8), parallel baseline (9), be similar to the parallel rule (4) that several parallel lines holes in parallel lines hole (10) are formed.

2. the plotting sheet of 1. stipulating by claim, 0 °, 180 ° reticules that it is characterized in that protractor (2) overlap with the base of protractor, and the angle point of estimating one's own ability is carved with the semicircle scope of two plussage hornworks (2), the ruler that directes reach right angle triangle (1) hypotenuse two ends respectively to 0 °, 180 ° directions.

3. the plotting sheet of 1. stipulating by claim is characterized in that circle center piece (5) is made up of rubber cap (11), steel pricker (12) and circle center hole (13).

4. the plotting sheet of 3. stipulating by claim is characterized in that the neck that flexibly tightly is enclosed within steel pricker (12) suitable for reading of rubber cap (11), and end opening is cemented on the right angle triangle (1) with powerful viscose glue.

5. the plotting sheet of 3. stipulating by claim is characterized in that circle center hole (13) is when moulding casting right angle triangle (1), once moulds and casts type, and its size just enough steel pricker (12) is twitched up and down.

6. the plotting sheet of 1. stipulating by claim, the setting that it is characterized in that the compasses hole are from the distance center of circle minimum 0.5 centimetre, establish a hole to unit length of the every increase of the distance in the center of circle, and these holes are to mould when casting right angle triangle (1), once moulding and cast type.

7. the plotting sheet of 6. stipulating by claim, it is characterized in that said to distance of center circle from unit length of every increase, the I of this unit length is little of 0.05 centimetre.

8. the plotting sheet of 1. stipulating by claim is characterized in that parallel baseline (9) is parallel to the base of plotting sheet.

9. the plotting sheet of 1. stipulating by claim, the setting that it is characterized in that the parallel lines hole is from parallel baseline (9), and unit length of the every increase of distance is vertically downward established a hole, and these holes are when moulding casting right angle triangle (1), once mould and cast type.

10. the plotting sheet of 9. stipulating by claim, it is characterized in that said from parallel baseline 9., unit length of the every increase of distance vertically downward, this unit length can be little of 0.05 centimetre.