CN203837608U - Gradian vernier disc protractor - Google Patents
Gradian vernier disc protractor Download PDFInfo
- Publication number
- CN203837608U CN203837608U CN201420197445.9U CN201420197445U CN203837608U CN 203837608 U CN203837608 U CN 203837608U CN 201420197445 U CN201420197445 U CN 201420197445U CN 203837608 U CN203837608 U CN 203837608U
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- CN
- China
- Prior art keywords
- disc
- protractor
- trip
- vernier
- dish
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- Expired - Fee Related
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- Length-Measuring Instruments Using Mechanical Means (AREA)
Abstract
The utility model relates to a gradian vernier disc protractor, specifically relates to a double-layer high-precision vernier protractor employing transparent polymethyl methacrylate or plastics, and belongs to measurement tools and school things. The gradian vernier disc protractor is mainly formed by a circular base disc and a circular vernier disc, the circumference of a disc surface of the base disc is engraved with equally-divided gradian scale marks and marked with degree values, the circumference of a disc surface of the vernier disc is engraved with equally-divided one hundred and one scale marks and marked with degree values, the vernier disc and the base disc are connected or combined in a concentric circle manner and can relatively rotate, the diameter of the vernier disc is smaller than the diameter of the base disc, and the scale marks on the vernier disc and the scale marks on the base disc are partly overlapped. The gradian vernier disc protractor is a double-disc type protractor, the structure is simple, the cost is low, the usage is convenient, the protractor is well compatible with the circumferential degree system and the circumferential radian system, and wide application values are provided for angle measurement and learning and researches.
Description
Technical field
The utility model relates to a kind of centigrade trip dish protractor, particularly adopts the double-layer high-precision vernier protractor of transparent organic glass or plastics, belongs to survey instrument and study article.
Background technology
The conventional unit of angle is shaped with three kinds of 360 calibration systems, 400 calibration systems, Circular measure.
Conventional protractor is semi-circular disks, adopts 360 calibration systems, is sexagesimal between unit, and half cycle 180 is spent scale mark, reading error approximately 0.2 degree, error rate 0.2/360 ≈ 0.0556% of full circle relatively.
But need in the scope at full circle, take measurement of an angle in some occasion.
And in other situation, precision is had to higher requirement, wish further to improve the precision measured, reduce error.
Also find one week 360 ° of simple, intuitive not enough simultaneously, angular unit °, ', " comparatively trouble of conversion is mutually difficult to judge fast round angle number that its value comprises and the quadrant at place, angle in the time of the angle aggregate-value that contains multiple round angles.
Summary of the invention
Technical problem to be solved in the utility model is:
1, the measurement of angle within the scope of full circle;
2, adopt the scale mark of simple angular unit system directly perceived and corresponding calibration;
3, improve the reading accuracy of measuring.
The utility model provides a kind of centigrade trip dish protractor, is double plate protractor.
Technical problem to be solved in the utility model is achieved through the following technical solutions.
A kind of centigrade trip dish protractor, adopts the transparent thin board that is carved with the number of degrees; Centigrade trip dish protractor is mainly made up of circular basal disc and circular trip dish; On the circumference of basal disc card, be carved with the centigrade system line of decile, and indicate number of degrees value, and 0 scale overlaps with 100 scales; The 101 scale division lines that are carved with decile on the circumference of trip dish card, also indicate number of degrees value, and its 0 scale overlaps with 101 scales; Trip dish and basal disc couple together at centre point by pin, and trip dish and basal disc overlap but can relatively rotate, or trip dish is realized concentric circles combination in relative rotation by embedding basal disc.
Trip dish is more smaller than basal disc diameter, on the scale mark region on scale mark and basal disc on trip dish, overlaps.
Centigrade trip dish protractor adopts centigrade system of units, that is: a round angle is divided into 100 units, unit symbol: (
p), read and do: " calibration ", the unit simple, intuitive of centesimal system.
Centigrade trip dish protractor is made up of the trip dish of the basal disc with centigrade system line and 101 scale division lines, one side of 0 of basal disc datum line alignment angle when use, and rotation trip dish makes the another side of 0 datum line alignment angle of trip dish.
The basal disc of protractor adopts the centigrade of full circle 100 deciles, and the reading on scale mark is 0～100, and it 0 overlaps with 100 positions.Scale value is the percentage value of full circle, as reading 36, represents 36
p, i.e. 36% of a round angle angle.When directly reading takes measurement of an angle from basal disc, can there is an estimated value, i.e. a place value after radix point, reading error approximately 0.1
p, the error rate of full circle is relatively: 0.1%.
The trip dish of protractor adopts 100 one divisions of 101 deciles, and the value on scale mark is 0～101, and it 0 overlaps with 101 positions.Because trip dish and basal disc full circle scale division value differ lattice, in one week of full circle, the scale mark of trip dish and the scale mark of basal disc only have a place to align, trip is coiled indicated angle value and is read on the trip dial scale line aliging with basal disc scale mark, and the angle-differentiated value of reading is 0.01
p, this least unit is as the error rate of its relative full circle of number of degrees error: 0.01%.
In the time adopting trip dish to improve angular readings precision, the read-only round values to scale mark of reading value on basal disc, disregard the estimated value between scale mark, the scale mark that the angle value between scale mark coils by trip is read, that is: the centigrade at angle value=basal disc scale reading+trip dial scale reading/100.Certainly, also the readout of the estimated value between basal disc scale mark and trip dish high scale line can be compared, confirmation mutually, reduces erroneous judgement.
Centigrade trip dish protractor is a kind of double plate protractor, has the features such as simple in structure, with low cost, easy to use, in measurement of angle and study are studied, has a wide range of applications.
Brief description of the drawings
The basal disc of Fig. 1 centigrade trip dish protractor.
The trip dish of Fig. 2 centigrade trip dish protractor.
The small angle measurement of Fig. 3 centigrade trip dish protractor.
The measurement of angle of Fig. 4 centigrade trip dish protractor.
Fig. 5 sells in the center of circle side-looking center section plan of fixed centigrade trip dish protractor.
The side-looking center section plan of the embedded centigrade trip of Fig. 6 concentric circles dish protractor.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in detail.
Embodiment
Centigrade trip dish protractor is made up of circular basal disc and circular trip dish, and basal disc and trip dish adopt the transparent organic glass thin plate that indicates the number of degrees and scale mark.
As shown in Figure 1, trip dish as shown in Figure 2 for basal disc.
The angular unit of centigrade trip dish protractor adopts centesimal system, simple, intuitive.
The basal disc of centigrade trip dish protractor adopts the centigrade of full circle 100 deciles, and the value on scale mark is 0～100, every scale division value of 5 graduated scale.Scale value is the scale division value at angle, as reading 36, represents 36
p, i.e. 36% of a round angle angle; Certainly can also there is an estimated value, as reading 36.2, represent 36.2
p, i.e. 36.2% of a round angle angle.
The trip dish of centigrade trip dish protractor adopts the scale mark of 101 deciles, and the value on scale mark is 0～101, every value of 5 case marker, conventionally directly identifies lattice numerical value.One on lattice on trip dish and basal disc differs approximately 0.01
pbecause trip dish and basal disc full circle scale division value differ lattice, in one week of full circle, the scale mark of trip dish and the scale mark of basal disc only have a place to align, and the angle value of trip dish is read on the trip dial scale line aliging with basal disc scale mark, and the every lattice of scale readout on trip dish are 0.01
p, therefore its reading is latter two of centigrade radix point.If the reading of the trip dish high scale line aliging with basal disc scale mark is 35, represent that this scale division value is 0.35
p.
Trip dish and basal disc couple together at centre point by pin, and trip dish and basal disc overlap but can relatively rotate.One side of 0 datum line alignment angle of basal disc when centigrade trip dish protractor uses, rotation trip dish makes the another side of 0 datum line alignment angle of trip dish, and the top of the horn is aimed in the center of circle.
Trip dish is more smaller than basal disc diameter, on the scale mark region on scale mark and basal disc on trip dish, overlaps, and contributes to clearly to judge overlapping the neatest of scale mark on which root scale mark and the basal disc on trip dish.
In the time adopting trip dish to improve angular readings precision, the read-only value to scale mark of reading value on basal disc, disregard the estimated value between scale mark, the scale mark that angle value between scale mark coils by trip is read, that is: weekly value=basal disc scale reading+trip dial scale reading/100 at angle, can not be simultaneously the readout of the estimated value between basal disc high scale line and trip dish high scale line be added, but both can compare, to reduce erroneous judgement.
Obviously, calibration is exactly the percentage value of full circle round angle.
Centesimal system:
Centesimal system, unit symbol: (
p), that is: " calibration ".A round angle is 100
p, 1
pit is 1/100th of a round angle.The scale adopting due to centesimal system is the decimal system, represents that the size of angle is simple, directly perceived with integer and decimal.
The conversion relation of centigrade and 360 calibration, 400 calibration, radian:
100
P＝360°＝400
G＝2π
R
Weekly system:
Weekly system (another name: circle degree system, degree of turning system), unit symbol: (
c), that is: " weekly ".A round angle is 1
c, 1
cbe the weekly of a round angle.The integral part of weekly value represents that angle contained round angle number, fraction part represent the position of corner on plane right-angle coordinate.
The conversion relation of weekly and centigrade, 360 calibration, 400 calibration, radian:
1
C＝100
P＝360°＝400
G＝2π
R
The weekly system of units at angle is weighed the size at angle with round angle, directly perceived simply again, and the contained round angle number in angle can directly be read, and place quadrant number also can very simply judge.
All Circular measures:
All Circular measures, unit symbol: (Π
r), that is: " all radians " wherein: Π=2 π is called full circle frequency, can be read work " week " in the time representing angular unit.A round angle is 1 Π
r, 1 Π
rbe all radian, all radians adopts weekly and full circle frequency product to represent the system of units of angle size.
Identical with weekly value, the integral part of all radian values represents that angle contained round angle number, fraction part represent the position of corner on plane right-angle coordinate.
For example: all radians at angle are 218.6 Π
r, that is: 218.6 round angles, 218.6 times of round angle, represent to contain 218 round angles radian of 0.6 week again, and this angle is at third quadrant.
The conversion relation of all Circular measures and other system of units:
1Π
R＝1
C＝100
P＝360°＝400
G＝2π
R (3.2)
All radians, the expression mode of a kind of angle size, adopts round angle radian (Π
r) as unit, in form identical with weekly system, but final unit is radian, therefore, all Circular measures are actually another form of Circular measure, are also the another kind of method for expressing of angular unit.
Visible, centesimal system and weekly system, all Circular measures have fabulous compatibility.
In the time that the scale division value of centesimal system is interpreted as percentage value, centesimal system extends to weekly system, all Circular measures, and centigrade trip dish protractor is weekly protractor or all radian protractors.
Centigrade trip dish protractor, also referred to as weekly trip dish protractor or all radian trip dish protractors, is a kind of being simple and easy to, protractor that system of units versatility is good.
Centigrade trip dish protractor is measured when low-angle as shown in Figure 3.
Centigrade trip dish protractor is measured when common angle as shown in Figure 4.
Centigrade trip dish protractor side-looking center section plan as shown in Figure 5, Figure 6.
Claims (2)
1. a centigrade trip dish protractor, adopts the transparent thin board that is carved with the number of degrees; It is characterized in that:
Centigrade trip dish protractor is mainly made up of circular basal disc and circular trip dish; On the circumference of basal disc card, be carved with the centigrade system line of decile, and indicate number of degrees value, and 0 scale overlaps with 100 scales; The 101 scale division lines that are carved with decile on the circumference of trip dish card, also indicate number of degrees value, and its 0 scale overlaps with 101 scales; Trip dish and basal disc couple together at centre point by pin, and trip dish and basal disc overlap but can relatively rotate, or trip dish is realized concentric circles combination in relative rotation by embedding basal disc.
2. by centigrade trip dish protractor claimed in claim 1, it is characterized in that:
Described trip dish is more smaller than basal disc diameter, on the scale mark region on scale mark and basal disc on trip dish, overlaps.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420197445.9U CN203837608U (en) | 2014-04-22 | 2014-04-22 | Gradian vernier disc protractor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420197445.9U CN203837608U (en) | 2014-04-22 | 2014-04-22 | Gradian vernier disc protractor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203837608U true CN203837608U (en) | 2014-09-17 |
Family
ID=51515433
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420197445.9U Expired - Fee Related CN203837608U (en) | 2014-04-22 | 2014-04-22 | Gradian vernier disc protractor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203837608U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105313551A (en) * | 2015-11-25 | 2016-02-10 | 国网山东省电力公司经济技术研究院 | Phase angle drawing device for power |
| CN105806171A (en) * | 2016-04-11 | 2016-07-27 | 黄友谊 | Measuring structure achieved by means of double concentric circles, method and application of the method |
-
2014
- 2014-04-22 CN CN201420197445.9U patent/CN203837608U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105313551A (en) * | 2015-11-25 | 2016-02-10 | 国网山东省电力公司经济技术研究院 | Phase angle drawing device for power |
| CN105313551B (en) * | 2015-11-25 | 2017-03-22 | 国网山东省电力公司经济技术研究院 | Phase angle drawing device for power |
| CN105806171A (en) * | 2016-04-11 | 2016-07-27 | 黄友谊 | Measuring structure achieved by means of double concentric circles, method and application of the method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140917 Termination date: 20150422 |
|
| EXPY | Termination of patent right or utility model |