CN105620126B - A kind of quick and precisely multipurpose plotter - Google Patents
A kind of quick and precisely multipurpose plotter Download PDFInfo
- Publication number
- CN105620126B CN105620126B CN201610094272.1A CN201610094272A CN105620126B CN 105620126 B CN105620126 B CN 105620126B CN 201610094272 A CN201610094272 A CN 201610094272A CN 105620126 B CN105620126 B CN 105620126B
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- China
- Prior art keywords
- circular arc
- drive gear
- fixed ruler
- tuning drive
- vertical line
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
- B43L—ARTICLES FOR WRITING OR DRAWING UPON; WRITING OR DRAWING AIDS; ACCESSORIES FOR WRITING OR DRAWING
- B43L13/00—Drawing instruments, or writing or drawing appliances or accessories not otherwise provided for
- B43L13/001—Mathematical drawing instruments
Abstract
A kind of quick and precisely multipurpose plotter, including fixed ruler and protractor, it is characterized in that：It is additionally provided with parallel lines quadric chain, vertical line mechanism and circular arc slide block mechanism and the tuning drive gear being connected as a single entity with fixed ruler, protractor, tuning drive gear is connected with fixed ruler center, and 360 degree of rotations are done centered on the tie point, circular arc slide block mechanism is arranged on the vertical line mechanism back side, parallel lines quadric chain is connected with vertical line mechanism, circular arc slide block mechanism bottom, and with vertical line mechanism, circular arc slide block mechanism is folding is connected as a single entity.The beneficial effects of the invention are as follows：By by ruler, protractor, set square, T-square, compasses and newly-designed three kinds of mechanisms permeate entirety, not only it is convenient for carrying, and is combined by function, additionally it is possible to parallel lines, vertical line, circular arc, bisector etc. is quick and precisely drawn according to intended size；The different instruments conversion in drawing is reduced, drawing efficiency is improved.
Description
Technical field
It is specifically a kind of quick and precisely multipurpose plotter the present invention relates to drawing instrument.
Background technology
With the popularization of computer drawing software, someone, which is mistakenly considered computer-assisted mapping, can substitute manual draw.
And with the development of multimedia teaching facility, many courses all use multimedia teaching, drastically increase some courses
Teaching efficiency, but from the point of view of application result feedback of these teaching means in the courses such as geometry, descriptive geometry, mechanical drawing,
With not having a stroke of the teacher in classroom teaching demonstration, therefore learn the courses such as geometry, drawing, industrial design in people
In, lack the exercise of manual draw, the understanding and Grasping level to drafting knowledge concepts is not just high.So these courses in recent years
Teaching increasingly pay attention to classroom manual draw teaching.Student's manual draw operation is also the necessary content of such course.I.e.
Make in the engineer applied of society, field surveys, engineering technology exchange, the process such as cartographical sketching in innovative design also be unable to do without
Manual draw.And the instrument that manual draw is generally required is exactly ruler except pen.Existing common ruler is painted with some component inventions
Figure instrument, draws drawing most common parallel segment, vertical segment, circle and circular arc, there is that accuracy is not high, and efficiency is low to ask
Topic.The problem of existing drawing instrument is in use is specifically described as follows：
Existing instrument is generally multiple instruments such as two set squares, compasses, also there is some combined instruments.Use
These instruments draw vertical line, parallel lines, circle and circular arc and have that accuracy is not high, and drawing step is cumbersome, the low problem of efficiency.Under
The deficiency existed in face of existing instrument is described as follows respectively：
Draw vertical line when operating procedure be：
Conventional tool：1st, both hands by a set square while concordant with an existing straight line；2nd, on the other hand（Usually left hand,
Referred to below as left hand）Pin triangle concordant with straight line motionless, solution releases another hand（Usually the right hand, referred to below as right
Hand）, pick up an other set square；3rd, the right hand is concordant with existing straight line by a right-angle side of another set square, and with it is preceding
One set square is close to, and is moved at intersection point；4th, left hand pins two set squares simultaneously, and keeps two set squares immovable
It can not rotate；5th, the right hand takes up one's pen, and set square draws vertical line always after；If 6 parallel lines drawn are logical lines, will also be again
Secondary set square of picking up is concordant with having drawn vertical line, then extends.Note, in drawing process, the right hand can not exert oneself very much, prevent from touching energetically
Set square is touched, moves it or misplaces.So draw vertical line process cumbersome, operation requires high, both hands are slightly uneven or quiver
It is dynamic, it will result in operating mistake or relatively large deviation.Therefore vertical line complex steps are drawn using existing instrument, efficiency is low, vertically
Degree it cannot be guaranteed that.
Patent No. CN101269600B combined mapper, T-square, ruler and drawing board are combined can
Realize, vertical line is conveniently drawn out on the drawing board of combination, cannot the side of realization by the drawing board of guide rail but have left combination
Just vertical line is drawn out.Such as in free desktop, blackboard surface, the occasion without combination drawing board such as building-site cannot be realized soon
Speed accurately draws out vertical line.
Draw parallel lines when operating procedure be：1st, both hands by a set square while concordant with an existing straight line；2、
On the other hand（Usually left hand, referred to below as left hand）Pin triangle concordant with straight line motionless, solution releases another hand（Usually
The right hand, the referred to below as right hand）, pick up an other set square；3rd, the right hand is straight with having by a right-angle side of another set square
Line is concordant, and is close to previous set square, moves at intersection point；4th, left hand pins two set squares simultaneously, and is kept for two
Set square is immovable to be rotated；5th, the right hand takes up one's pen, the set square scale always after, has found out parallel lines distance
There is the distance of straight line, and use black dots mark；6th, the right hand puts down pen, and it is motionless that left hand pins first set square；7th, the right hand will be another
One change of a line and previous set square of set square is concordant to be close to；8th, the right hand motionless, left hand of pinning second set square
Translate at first set square to the stain above marked, stop and pinned with left hand motionless；9th, the right hand unclamps second triangle
Plate, takes up one's pen, along first set square by marking stain place side to draw parallel lines.Parallel lines are so drawn than vertical line mistake
Journey is more cumbersome, and operation requires higher.Therefore parallel lines are drawn using existing instrument and equally exists complex steps, efficiency is low, parallel
Degree it cannot be guaranteed that the problem of.
Drafting etc. divides operating procedure during line segment to be：1st, boost line, and decile are first drawn with set square；2nd, with as parallel
The method of line, draws many places parallel lines；3rd, interlude boost line and numerous parallel lines；Produced problem is similar with parallel lines are drawn.
Drawing circle or operating procedure during circular arc is：1st, take out graduated scale, lie in face of；2 both hands hold the two of compasses
Compass leg tip is alignd for 0 point with graduated scale where bar leg, the center of circle, breaks the calibration points of another compass leg and required diameter into two with one's hands
Alignment；3rd, compasses head handheld terminal is picked up on the other hand, and compasses are fixed into tip on the other hand and alignd with the center of circle；4th, paper rotation drafting is pinned
Circular arc.It should be noted that since it is desired that the certain pressure changed vertically downward of application, prevents compasses center of circle tip in drawing process
Depart from paper or blackboard surface centre point, and pressure can not be too big, because the two legs of pressure direction and compasses are non-orthogonal,
Easily cause the diameter in rotary course gradually to increase, the circle finally drawn can not be closed, but a helix.Therefore so
Draw circular curve and equally exist difficulty greatly, efficiency is low, the problem of degree of accuracy is unable to strict guarantee.
In summary, how by improving drawing instrument, the accuracy and efficiency of manual draw is improved, to classroom instruction, work
The effect of efficiency and accuracy is all improved in terms of journey exchange of technology, innovative design.
The content of the invention
For the existing drawing instrument of solution in use, drafting parallel lines, vertical line, circle and circular arc accuracy be not high, operating procedure
It is cumbersome, the low problem of efficiency, the invention provides a kind of quick and precisely multipurpose plotter, the plotter can be according to scale
The drafting of very little rapidly and accurately various bargraphs, reduces the different operating conversion in drawing, improves drawing efficiency.
Realizing the technical scheme of the object of the invention is：
A kind of quick and precisely multipurpose plotter, including fixed ruler and protractor, unlike the prior art：Also set
It is equipped with parallel lines quadric chain, vertical line mechanism and circular arc slide block mechanism and the scale being connected as a single entity with fixed ruler, protractor
Pointer, tuning drive gear is connected with fixed ruler center, and 360 degree of rotations are done centered on the tie point, and circular arc slide block mechanism is set
At the vertical line mechanism back side, parallel lines quadric chain is connected with vertical line mechanism, circular arc slide block mechanism bottom, and with vertical line mechanism,
Circular arc slide block mechanism is folding to be connected as a single entity.
The parallel lines quadric chain includes fixed ruler and the swing arm being arranged on fixed ruler, rocking bar, scale refer to
Pin and slide rail locking button, swing arm upper end are connected with fixed ruler both sides Vertical movements respectively, and lower end is flexibly connected with rocking bar, shape
Into quadric chain, tuning drive gear is vertically set on fixed ruler, and can be rotated along fixed ruler 1, pointer top and slide rail
Button is connected.Using quadric chain, realize the principle of parallelogram, it is ensured that the graduated scale of ruler while with above and below parallel-plate
Side is parallel all the time, and can rotate through to determine the vertical range between two parallel lines with graduated pointer.
Tuning drive gear and the parallel lines respective outer side edges, bisector can be quickly drawn without making boost line.
The tuning drive gear with it is fixed ruler is vertical is connected, be combined into T-square structure.
The vertical line mechanism includes fixed ruler and the protractor being arranged on fixed ruler and the graduated scale with pointer,
Graduated scale lower end with it is fixed ruler is vertical is connected, upper end is connected with protractor, and protractor bottom is connected with fixation ruler.
Vertically gap is left on the graduated scale with pointer.
The circular arc slide block mechanism include fixed ruler and the compasses pin being arranged on fixed ruler, compasses sucker, pointer,
Slide rail locking button, mobile channels and pencil neck, compasses pin, compasses sucker are arranged on pointer by tightening nut, pointer
Lower end with it is fixed ruler is vertical is connected, upper end, which is provided with slide rail locking button and pencil neck, pointer, is vertically provided with mobile channels,
By mobile channels shifting sledge locking button, and pencil neck is locked, so draw circular arc, button is slid in dial
Radius is obtained, without being compared by graduated scale；Impact direction is all at compasses prong and at pencil and the downward pressure of the right hand, at three
It is vertically to make drawing, without cross influence；There is button locked at pencil, radial direction change will not be produced；It ensure that circular arc
Radian；So efficiency and accuracy are obtained for raising.
The parallel lines quadric chain is folded by hinge and is connected as a single entity with vertical line mechanism, circular arc slide block mechanism.
The hinge combines for foldable 90 ° of metal or plastic hinged and magnetic attraction block.
The pencil neck can also be chalk neck.
The beneficial effects of the invention are as follows：By by ruler, protractor, set square, T-square, compasses and newly-designed three
Kind of mechanism permeates an entirety, is not only convenient for carrying, and combined by function, additionally it is possible to according to intended size quick and precisely
Draw parallel lines, vertical line, circular arc, bisector etc.；The different instruments conversion in drawing is reduced, drawing efficiency is improved.
Brief description of the drawings
Fig. 1 is the overall structure diagram of plotter of the present invention；
Fig. 2 is the structural representation of parallel lines quadric chain；
Fig. 3 is the structural representation of vertical line mechanism；
Fig. 4 is the structural representation of circular arc slide block mechanism；
Fig. 5 is the enlarged diagram at A in Fig. 4；
Fig. 6 is the schematic diagram that is drawn parallel lines with existing drawing tools in application example；
Fig. 7 is the schematic diagram that is drawn parallel lines with multipurpose plotter of the present invention in application example.
In figure:1. the angulation of 6. tightening nut of ruler 2. pointer, 3. hinge, 4. compasses pin, 5. compasses sucker 7.
The pencil of 8. pointer groove of device, 9. slide rail locking button 10. or the rocking bar of 11. swing arm of chalk neck 12..
Embodiment
Embodiment：
Reference picture 1, a kind of quick and precisely multipurpose plotter of the present invention, by ruler 1, protractor 7 and with ruler 1, angulation
Parallel lines quadric chain, vertical line mechanism and circular arc slide block mechanism that device 2 is connected as a single entity, circular arc slide block mechanism are arranged on vertical line machine
The structure back side, is provided with a tuning drive gear 2, the pointer 2 does 360 degree centered on fixing the tie point of ruler 1 in the fixed center of ruler 1
Rotation, parallel lines quadric chain is connected with vertical line mechanism, circular arc slide block mechanism bottom, and with vertical line mechanism, circular arc sliding block machine
Structure is connected as a single entity by the way that hinge 3 is folding.
Reference picture 2, the parallel lines quadric chain include fixed ruler 1 and the swing arm 11 being arranged on fixed ruler 1,
Rocking bar 12, tuning drive gear 2 and slide rail locking button 9, the upper end of swing arm 11 are connected with the fixed both sides Vertical movements of ruler 1 respectively, under
End is flexibly connected with rocking bar 12, forms quadric chain, and tuning drive gear 2 is vertically set on fixed ruler 1, and can be straight along fixing
Chi 1 is rotated, and the top of pointer 2 is connected with slide rail locking button 9.Using quadric chain, the principle of parallelogram is realized, it is ensured that
The graduated scale of ruler can rotate through to determine that two is parallel while following parallel all the time with parallel-plate with graduated pointer
Vertical range between line.
Realizing the operating procedure of accurate Fast Drawing parallel lines is：A, left hand hold quadric chain, make to fix the side of ruler 1
It is concordant with existing straight line, pointer 2 is stirred, makes it vertical with ruler 1；B, the right hand stir swing arm 11, make the outer side edges of rocking bar 12 with
Scale alignment needed on tuning drive gear 2；C, left hand pin quadric chain, and the right hand takes outer side edges setting-out of the pen along rocking bar 12,
As required parallel lines.Thus by 8 steps required for original drafting parallel lines, it is changed into 3 present steps.And because double leval jib
Mechanism is parallelogram, as long as the precision of the mechanism is guaranteed, and the depth of parallelism of corresponding parallel lines is with regard to that can be guaranteed.This
Sample efficiency and accuracy are obtained for raising.
Tuning drive gear and the parallel lines respective outer side edges, bisector can be quickly drawn without making boost line.Realize accurate
True Fast Drawing etc. divides the operating procedure of line segment to be：A, left hand hold quadric chain, make to fix the side of ruler 1 with needing decile straight
Line is concordant, stirs pointer 2, makes it vertical with ruler 1（Inclination can also）；B, the right hand stir swing arm 11, make on its tuning drive gear 2
Required scale（Such as 1cm graduation marks）Alignment；C, left hand pin quadric chain, and the right hand takes a side of the pen along rocking bar 12 to draw
Line, is to wait first parallel lines of point straight line；Rocking bar 12 is stirred to next scale（Such as 2cm graduation marks）, then it is same in rocking bar 12
Draw Article 2 parallel lines in side；Rocking bar 12 is stirred to next scale（Such as 3cm graduation marks）, then in the same side of rocking bar 12 draw the
Three parallel lines, the like can the existing straightway of decile.
The tuning drive gear 2 with it is fixed ruler 1 is vertical is connected, be combined into T-square structure.
Reference picture 3, the protractor 7 and scale that the vertical line mechanism includes fixed ruler 1 and is arranged on fixed ruler 1 refers to
Vertical on pin 2, tuning drive gear 2 to leave gap, ruler 1 is vertical is connected for the lower end of tuning drive gear 2 and fixation, and upper end connects with protractor 7
Connect, the bottom of protractor 7 is connected with fixed ruler 1.
Realizing the operating procedure of accurate Fast Drawing vertical line and other each angle lines is：A, the right hand stir pointer 2, make finger
The interior joint measurement gap upper end of pin 2 shows 0 ° of angle；B, left hand hold vertical line mechanism, make to show existing straight line in gap, and with one
Side is concordant, and vertical line and the center of circle of protractor 7 are aligned（It can find out from joint measurement gap lower end in pointer 2）；C, left hand are pinned whole
Body mechanism, the right hand takes base setting-out of the pen along ruler 1, vertical line needed for being.Needed for thus drawing parallel lines originally
5 steps wanted, are changed into 3 present steps.And because pointer always points to the angle needed, as long as the precision of the mechanism is protected
Card, the depth of parallelism of corresponding parallel lines is with regard to that can be guaranteed.So efficiency and accuracy are obtained for raising.
Reference picture 4-5, the circular arc slide block mechanism include fixed ruler 1 and the compasses pin 4 being arranged on fixed ruler 1,
Compasses sucker 5, pointer 2, slide rail locking button 9, mobile channels 8 and pencil or chalk neck 10, compasses pin 4, compasses sucker 5 lead to
Cross tightening nut 6 and be arranged on the end of pointer 2, the lower end of pointer 2 with it is fixed ruler 1 is vertical is connected, upper end is provided with slide rail locking button 9
With pencil or chalk neck 10, mobile channels 8 are vertically provided with pointer 2, by the shifting sledge locking button 9 of mobile channels 8, and
Pencil or chalk neck 10 are locked, circular arc is so drawn, is that can obtain radius in dial sliding button, without by graduated scale ratio
It is right；At compasses prong and at pencil and the downward pressure of the right hand, Impact direction is all vertically to make drawing at three, does not intersect shadow
Ring；There is button locked at pencil, radial direction change will not be produced；It ensure that the radian of circular arc；So efficiency and accuracy is all
It is improved.
Realizing the operating procedure of accurate Fast Drawing circular arc or circle is：A, preparation：Select circular arc sucker 5 or circular arc needle
4, and adjusting elasticity nut 6；Pencil or chalk are adjusted at neck 10, and moves along mobile channels 8 cunning of certain counterweight
At rail button 9 to radius scale.B, left hand hold parallel line mechanism and the ruler 1 of lower section, and the right hand holds the upper end of protractor 7, to
After rotate so that 90 ° of 3 back rotation of hinge（Design can only be rotated by 90 °）.C, left hand are by circular arc needle 4 or circular arc sucker 5 to director circle
The arc center of circle, loose left hand, the right hand holds the rotation of the upper end of protractor 7, circular arc needed for both obtaining.
Application example
As shown in Figure 6：A-b. both hands by a set square while, proficiency concordant with an existing straight line（Usually left hand,
Referred to below as left hand）Pin triangle concordant with straight line motionless；C, solution release another hand（Usually the right hand, referred to below as right
Hand）, pick up an other set square, the right hand is concordant with existing straight line by a right-angle side of another set square, and with it is previous
Set square is close to, and is moved at intersection point；C-d, left hand pin two set squares simultaneously, and keep two set squares immovable
It can not rotate；D, the right hand take up one's pen, the set square scale always after, find out the distance of the existing straight line of parallel lines distance,
And use black dots mark, the right hand puts down pen, and it is motionless that left hand pins first set square, the right hand by a line of another set square with
Previous set square a line is concordantly close to;It is motionless that d-f, the right hand pin second set square, and left hand translates first set square
To the stain above marked, stop and pinned with left hand motionless；The right hand unclamps second set square, takes up one's pen, along first
Draw parallel lines in individual set square side where by marking stain.
As shown in fig. 7, a. left hands hold quadric chain, make fixed edge concordant with existing straight line, stir pointer, make its with
Ruler is vertical；The right hand stirs swing arm, the outer side edges of rocking bar is alignd with required scale on tuning drive gear；
B. left hand pins quadric chain, and the right hand takes outer side edges setting-out of the pen along rocking bar, parallel lines needed for being.
Compared with prior art, the application：
1. newly-designed double leval jib drawing mechanism, can realize according to given apart from size, quickly and accurately draw parallel
Line and decile line segment；
2. the arc drafting structure newly designed, can realize and quick and precisely draw circle and circle according to given radius size
Locking device in arc, structure anti-can draw the variation of diameter during circular arc；
3. the improvement T-square structure that optimization design goes out, can realize the vertical line for passing through existing straight line, a step is drawn；
4. mechanism and the instruments such as quadric chain, chute slide block mechanism, ruler, protractor are merged, with different mechanisms
And mode, more accurately and efficiently realize compasses, set square, protractor, T-square and CN10126900, CN103818161
Deng the function of combination tool, carrying is facilitated.
Claims (2)
1. a kind of quick and precisely multipurpose plotter, including fixed ruler and protractor, it is characterized in that：It is additionally provided with parallel lines four
Linkage, vertical line mechanism and circular arc slide block mechanism and tuning drive gear, tuning drive gear are connected with fixed ruler center, and with scale
360 degree of rotations are done centered on the tie point that pointer is connected with fixed ruler center, circular arc slide block mechanism is arranged on the vertical line mechanism back of the body
Face, parallel lines quadric chain is connected with vertical line mechanism, circular arc slide block mechanism bottom, and with vertical line mechanism, circular arc slide block mechanism
It is folding to be connected as a single entity；
The parallel lines quadric chain is included in swing arm, rocking bar and the slide rail locking button being arranged on fixed ruler, swing arm
End is connected with fixed ruler both sides Vertical movements respectively, and lower end is flexibly connected with rocking bar, forms quadric chain, tuning drive gear top
End is connected with slide rail locking button；
Tuning drive gear and the parallel lines quadric chain coordinates, and bisector can be quickly drawn without making boost line；
The tuning drive gear with it is fixed ruler is vertical is connected, be combined into T-square structure；
The vertical line mechanism includes the protractor and tuning drive gear being arranged on fixed ruler, tuning drive gear lower end and fixed ruler
Vertical connection, upper end is contacted with protractor, and protractor bottom is connected with fixed ruler；
The circular arc slide block mechanism include being arranged on compasses pin on fixed ruler, compasses sucker, tuning drive gear, slide rail locking by
Key, mobile channels and pencil neck, compasses pin, compasses sucker are arranged on tuning drive gear by tightening nut, under tuning drive gear
End with it is fixed ruler is vertical is connected, upper end is vertically led on tuning drive gear provided with activity provided with slide rail locking button and pencil neck
Groove, by mobile channels shifting sledge locking button, and locks pencil neck, draws circular arc, slide rail is slid on tuning drive gear
Locking button is that can obtain radius；At compasses prong and at pencil and the downward pressure of the right hand, Impact direction is all vertical at three
Directly make drawing, without cross influence；There is button locked at pencil, radial direction change will not be produced；Ensure the radian of circular arc.
2. multipurpose plotter according to claim 1, it is characterized in that：The pencil neck can also be chalk neck.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610094272.1A CN105620126B (en) | 2016-02-22 | 2016-02-22 | A kind of quick and precisely multipurpose plotter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610094272.1A CN105620126B (en) | 2016-02-22 | 2016-02-22 | A kind of quick and precisely multipurpose plotter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105620126A CN105620126A (en) | 2016-06-01 |
| CN105620126B true CN105620126B (en) | 2017-10-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610094272.1A Expired - Fee Related CN105620126B (en) | 2016-02-22 | 2016-02-22 | A kind of quick and precisely multipurpose plotter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105620126B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106379084A (en) * | 2016-09-14 | 2017-02-08 | 中国地质大学（武汉） | Multifunctional integrated ruler |
| CN111089520A (en) * | 2019-12-09 | 2020-05-01 | 陈雪 | Protractor capable of measuring different angles |
| CN112406374B (en) * | 2020-11-30 | 2022-06-03 | 南宁学院 | Mechanical drawing instrument |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH516788A (en) * | 1969-03-13 | 1971-12-15 | Barros Fernando De | Navigation trapeze |
| CN2032553U (en) * | 1988-04-09 | 1989-02-15 | 熊明德 | Multipurpose geometry gauge |
| CN202106756U (en) * | 2011-07-03 | 2012-01-11 | 毕德亭 | Ruler for drawing parallelograms |
| CN203805585U (en) * | 2014-05-04 | 2014-09-03 | 翟登凯 | Combined type mathematics teaching aid |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100981765B1 (en) * | 2008-09-26 | 2010-09-15 | 정현호 | Protractor having angle indicating ruler |
-
2016
- 2016-02-22 CN CN201610094272.1A patent/CN105620126B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH516788A (en) * | 1969-03-13 | 1971-12-15 | Barros Fernando De | Navigation trapeze |
| CN2032553U (en) * | 1988-04-09 | 1989-02-15 | 熊明德 | Multipurpose geometry gauge |
| CN202106756U (en) * | 2011-07-03 | 2012-01-11 | 毕德亭 | Ruler for drawing parallelograms |
| CN203805585U (en) * | 2014-05-04 | 2014-09-03 | 翟登凯 | Combined type mathematics teaching aid |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105620126A (en) | 2016-06-01 |
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Granted publication date: 20171031 Termination date: 20180222 |