CN201544648U - Compass - Google Patents
Compass Download PDFInfo
- Publication number
- CN201544648U CN201544648U CN200920220781XU CN200920220781U CN201544648U CN 201544648 U CN201544648 U CN 201544648U CN 200920220781X U CN200920220781X U CN 200920220781XU CN 200920220781 U CN200920220781 U CN 200920220781U CN 201544648 U CN201544648 U CN 201544648U
- Authority
- CN
- China
- Prior art keywords
- screw rod
- compasses
- support feet
- compass
- left branch
- 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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Landscapes
- Drawing Aids And Blackboards (AREA)
- Length-Measuring Instruments Using Mechanical Means (AREA)
Abstract
The utility model discloses a compass, comprising a knob, a left and a right support feet hinged on a shaft, wherein a lower end of the left support foot is screwed with a compass tip, while a lower end of the right support foot is screwed with a pen core device; the shaft is fixed with a circular protractor; two bulges are respectively molded at two-thirds position of the left and right support feet; a screw rod crossing the left and right support feet is screwed in the two bulges. The distance between the two support feet can be controlled through adjusting the screw rod, and once selected, due the friction function between the screws, the two support feet do not generate relative displacement whiling drawing, nor influence drawing accuracy and aesthetic property. Adopting the protractor enables the compass to measure degrees of arcs except drawing. A symmetric measure scale surface is formed on the screw of the screw rod and used as an indicator scale, thereby solving the problems that traditional compass needs a special indicator scale to measure radius when drawing, and reducing previous errors caused by two operations.
Description
Technical field:
The utility model relates to office drawing field, more specifically to a kind of compasses that can read the radius of circle of painting.
Background technology:
Compasses are used for the instrument of picture circle and circular arc in mathematics and drawing, existing compasses comprise knob, two supporting legs, the upper end is hinged, can rotate around hinged axle, is bolted with the compasses point on the leg, be bolted with pen-cartridge device on the another leg, be used for placing the pen core of picture usefulness.But it also has weak point: 1) because compasses itself are not with rule, so need just can paint with the good drawn radius of a circle of scale dipstick metering earlier before drawing circle, many procedures have also strengthened the error of drawing; 2) effect is more single, can only do picture usefulness, can not take measurement of an angle; 3),, influence the accuracy and the aesthetic property of institute's drawing paper so occur the situation that supporting leg is run easily when drawing because two supporting legs are hinged.
The utility model content:
The purpose of this utility model is to overcome the deficiencies in the prior art, and a kind of compasses are provided, and has solved the problem that existing compasses can not directly be read the radius of a circle of doing.
Technology solution of the present utility model is as follows:
A kind of compasses comprise knob, and left branch leg and right supporting leg are hinged on the axle, and described left branch leg lower end snail is connected to the compasses point; Described right supporting leg lower end snail is connected to pen-cartridge device, is fixed with circular protractor on the described axle; Described left branch leg 2/3rds places form boss; Right supporting leg 2/3rds places form boss; Screw rod passes left branch leg, right supporting leg is screwed onto in two boss.
Described a kind of compasses form symmetrical scale face on the described screw flight.
Described a kind of compasses, described screw rod external part is fixed with cylinder-shaped shaft.
Described a kind of compasses, described cylinder-shaped shaft surface has the annular knurl line.
Described a kind of compasses, described circular protractor are provided with the FR scale indication of 0 ~ 360 degree.
The beneficial effects of the utility model are:
1, compasses comprise knob, and left branch leg and right supporting leg are hinged on the axle, and described left branch leg lower end snail is connected to the compasses point; Described right supporting leg lower end snail is connected to pen-cartridge device, is fixed with circular protractor on the described axle; Described left branch leg 2/3rds places form boss; Right supporting leg 2/3rds places form boss; Screw rod passes left branch leg, right supporting leg is screwed onto in two boss.Adjusting screw(rod) can be controlled two distances between the supporting leg when using like this, and after selected, because the rubbing action between the screw thread, two supporting legs can not produce relative displacement, precision and aesthetic property that influence is drawn when drawing.The employing of protractor makes compasses can also measure the angle of circular arc except drawing, and has embodied one-object-many-purposes.
2, form symmetrical scale face on the screw flight, make it to play the effect of rule, solved the problem that needs to measure radius before compasses are drawn in the past, reduced in the past because the error of twice operation with special rule.
3, be fixed with cylinder-shaped shaft at the screw rod external part, and the surface has annular knurl, thus rotation get up than being easier to, time saving and energy saving.
4. described circular protractor is provided with the FR scale indication of 0 ~ 360 degree, makes that like this measurement category is big, not only can measure acute angle, can also measure the obtuse angle easily.
Description of drawings:
Fig. 1 is a front view of the present utility model;
Fig. 2 is this screw rod and rotating shaft schematic diagram;
Fig. 3 is the cross-sectional schematic of bolt.
The right supporting leg 41-of the circular protractor 3-of 1-knob 2-left branch leg 31-boss 4-boss 5-rotating shaft 6-scale face 7-compasses point 8-pen-cartridge device 9-axle 10-screw rod
The specific embodiment:
Embodiment sees Fig. 1 ~ 3, and a kind of compasses comprise knob 1, and left branch leg 3 and right supporting leg 4 are hinged on the axle 9, and described left branch leg 3 lower end snails are connected to compasses point 7; Described right supporting leg 4 lower end snails are connected to pen-cartridge device 8, are fixed with circular protractor 2 on the described axle 9; Described left branch leg 2/3rds three places form boss 31; Right supporting leg 2/4ths three places form boss 41; Screw rod 10 passes left branch leg 3, right supporting leg 4 is screwed onto in two boss 31,41.
Form symmetrical scale face 6 on the screw thread of described screw rod 10.
Described screw rod 10 external parts are fixed with cylinder-shaped shaft 5.
Described cylinder-shaped shaft 5 surfaces have the annular knurl line.
Described circular protractor 2 is provided with the FR scale indication of 0 ~ 360 degree.
Operation principle, when in use, be the center of circle with the compasses point 7 of left branch leg 3, rotating shaft 5 is regulated and is driven screw rods 10 and rotate in two boss 31,41, and scale face 6 has the indication of displacement scale, makes and can calculate the leg openings displacement in rotating shaft 5.Left branch leg 3 and right supporting leg 4 open, when left branch leg 3 and right supporting leg 4 open distances reach institute and paint radius of a circle, the rotating shaft 5 of stopping the rotation, beginning is the center of circle with the compasses point 7 of left branch leg 3, pen core with device in the pen-cartridge device 8 is drawn, because the rubbing action of screw rod 10 and two boss 31,41 internal threads, so in the process of drawing, can not make because of undue force between two supporting legs and produce displacement, and change original radius of a circle.The angle that can measure circular arc of circular protractor 2, the FR scale indication of 0 ~ 360 degree makes that the measurement category of circular protractor 2 is very wide.
Claims (5)
1. compasses comprise knob (1), and left branch leg (3) and right supporting leg (4) are hinged on the axle (9), and described left branch leg (3) lower end snail is connected to compasses point (7); Described right supporting leg (4) lower end snail is connected to pen-cartridge device (8), it is characterized in that: be fixed with circular protractor (2) on the described axle (9); Described left branch leg (3) 2/3rds places form boss (31); Right supporting leg (4) 2/3rds places form boss (41); Screw rod (10) passes left branch leg (3), right supporting leg (4) is screwed onto in two boss (31,41).
2. a kind of compasses according to claim 1 is characterized in that: form symmetrical scale face (6) on the screw thread of described screw rod (10).
3. a kind of compasses according to claim 1 is characterized in that: described screw rod (10) external part is fixed with cylinder-shaped shaft (5).
4. a kind of compasses according to claim 3 is characterized in that: described cylinder-shaped shaft (5) surface has the annular knurl line.
5. a kind of compasses according to claim 1 is characterized in that: described circular protractor (2) is provided with the FR scale indication of 0 ~ 360 degree.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920220781XU CN201544648U (en) | 2009-11-03 | 2009-11-03 | Compass |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920220781XU CN201544648U (en) | 2009-11-03 | 2009-11-03 | Compass |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201544648U true CN201544648U (en) | 2010-08-11 |
Family
ID=42599809
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200920220781XU Expired - Fee Related CN201544648U (en) | 2009-11-03 | 2009-11-03 | Compass |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201544648U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110901265A (en) * | 2018-09-14 | 2020-03-24 | 靳宇阳 | Screw rod scale compasses |
| CN111890823A (en) * | 2020-08-14 | 2020-11-06 | 彭泽宸 | Angle-stable fine-adjustment type compasses |
-
2009
- 2009-11-03 CN CN200920220781XU patent/CN201544648U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110901265A (en) * | 2018-09-14 | 2020-03-24 | 靳宇阳 | Screw rod scale compasses |
| CN111890823A (en) * | 2020-08-14 | 2020-11-06 | 彭泽宸 | Angle-stable fine-adjustment type compasses |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100811 Termination date: 20101103 |