CN2350721Y - Compasses capable of automatic determining radius with semicircle and ruler - Google Patents
Compasses capable of automatic determining radius with semicircle and ruler Download PDFInfo
- Publication number
- CN2350721Y CN2350721Y CN 98246257 CN98246257U CN2350721Y CN 2350721 Y CN2350721 Y CN 2350721Y CN 98246257 CN98246257 CN 98246257 CN 98246257 U CN98246257 U CN 98246257U CN 2350721 Y CN2350721 Y CN 2350721Y
- Authority
- CN
- China
- Prior art keywords
- ruler
- chi
- compasses
- carved
- protractor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Drawing Aids And Blackboards (AREA)
Abstract
The utility model relates to a compass capable of automatically determining a radius with a protractor and rulers. Two legs of the compass are fixed with the rules. The left ruler is carved with the scales of the protractor in sheathing. The right ruler is carved with a scale disc in sheathing. A rotating shaft is fixed with a pointer. When the two legs of the compass are separated and form a certain angle, the radius thereof can be directly determined by the angle of the scale disc, which is indicated by the pointer. When the two legs of the compass is separated and form 180 DEG, the right ruler and the left ruler are united into one ruler. The utility model has the advantages of convenient operation and easy fabrication and is particularly favorable by students.
Description
The utility model relates to a kind of compasses, specifically, is a kind ofly can determine radius automatically, has the compasses of protractor and ruler.
The existing compasses round usefulness of can only drawing a picture, and when the bowlder that needs a certain radius of picture, must have ruler to cooperate could determine, not too convenient during use.
The purpose of this utility model is a kind of novel bow compass of design, makes these compasses can determine radius automatically, and has protractor and ruler, gives the user, brings convenience when particularly the student uses.
The utility model is to realize purpose of design like this.On left and right two legs of compasses, be fixed with left chi and right chi respectively, the left side edge of left side chi and the right side edge of right chi are carved and are carved with the ruler scale respectively, also overlap on the chi of a left side and be carved with the protractor scale, the upper left corner that cover is carved with right chi on the right chi is the index dial of 90 ° of covering of the fans of one-tenth at center, is fixed with pointer in the rotating shaft of compasses.
During use, when compasses two legs separated at an angle, pointer was then pointed out certain angle value on index dial.According to index dial upper angle number,, can extrapolate radius value according to the ratio of pointer length and compass leg length; When compasses two legs separately, when angle reached 180 °, left chi and right chi were merged into long ruler, then can be used as the use of dish chi.In addition, left chi and right chi also can be made ruler respectively separately and use, but left chi double as protractor uses.Therefore, very convenient during use.
Accompanying drawing is the utility model synoptic diagram.
Among the figure: 1, compasses, 2, rotating shaft, 3, pointer, 4, index dial, 5, right chi, 6, left chi, 7, protractor.
Below, in conjunction with the accompanying drawings, a non-limiting examples is illustrated.On left and right two legs of compasses 1, fix left chi 6 and right chi 5 respectively, carve the ruler scale in left chi 6 left side edge, alignment protractor scale again, right side edge at right chi 5 is carved the ruler scale, and the upper left corner with right chi 5 is the center again, and cover is carved into 90 ° of fan-shaped index dials 4, when 1 liang of leg of compasses was separated into 180 °, left chi 6 just was merged into a ruler with right chi 5.Fixed pointers 3 in rotating shaft 2, and when the two legs merging of compasses 1, when leg point distance was zero, the needle point of pointer 3 pointed to " 0 " of index dial 4 and locates.
The utility model is made easily, and is easy to use.
Claims (1)
1, can determine radius automatically, have the compasses of protractor and ruler, form, it is characterized in that by compasses:
1., on left and right two legs of compasses (1), be fixed with left chi (6) and right chi (5) respectively;
2., the left side edge of left chi (6) is carved with the ruler scale, cover is carved with protractor (7) scale;
3., the right side edge of right chi (5) is carved with the ruler scale, and is the center with the upper left corner, cover is carved with into index dial (4) scale of 90 ° of covering of the fans;
4., be fixed with pointer (3) in the rotating shaft (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98246257 CN2350721Y (en) | 1998-11-20 | 1998-11-20 | Compasses capable of automatic determining radius with semicircle and ruler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98246257 CN2350721Y (en) | 1998-11-20 | 1998-11-20 | Compasses capable of automatic determining radius with semicircle and ruler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2350721Y true CN2350721Y (en) | 1999-11-24 |
Family
ID=33991764
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98246257 Expired - Fee Related CN2350721Y (en) | 1998-11-20 | 1998-11-20 | Compasses capable of automatic determining radius with semicircle and ruler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2350721Y (en) |
-
1998
- 1998-11-20 CN CN 98246257 patent/CN2350721Y/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |