CN204757844U - Circular protractor - Google Patents

Circular protractor Download PDF

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Publication number
CN204757844U
CN204757844U CN201520477941.4U CN201520477941U CN204757844U CN 204757844 U CN204757844 U CN 204757844U CN 201520477941 U CN201520477941 U CN 201520477941U CN 204757844 U CN204757844 U CN 204757844U
Authority
CN
China
Prior art keywords
pointer
utility
model
circular protractor
circular
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
Application number
CN201520477941.4U
Other languages
Chinese (zh)
Inventor
马玉
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shandong Polytechnic College
Original Assignee
Shandong Polytechnic College
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Shandong Polytechnic College filed Critical Shandong Polytechnic College
Priority to CN201520477941.4U priority Critical patent/CN204757844U/en
Application granted granted Critical
Publication of CN204757844U publication Critical patent/CN204757844U/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Abstract

The utility model discloses a circular protractor, including the body, be provided with rectangular coordinate system on the body, be provided with 0 -360's angle scale on the body edge, the body comprises through the connection of folding paper two semi -circular bodies, swing joint has the pointer on the centre of a circle of body, is provided with ring shape spout on the body, is provided with the slider with chute match on the pointer. The utility model discloses a circular protractor makes things convenient for the teacher to do the demonstration for the student, and can easily demonstrate 0 jiao is how to 360 jiaos, can also solve the demonstration problem that is greater than 360 jiaos.

Description

A kind of circular protractor
Technical field
The utility model relates to a kind of circular protractor, belongs to teaching aid technical field.
Background technology
The protractor of current use, structure is generally all semicircle ruler, and ruler has scale on the surface.When this teaching aid uses, existing problems have: one is, inconvenient teacher demonstrates angle to student, and two are, can not demonstrate the relation between angle.
Utility model content
The utility model, in order to overcome the deficiency of above technology, provides a kind of circular protractor, facilitates teacher to demonstrate to student, and easily can demonstrate 0 ° of angle is how to 360 ° of angles, can also solve the demonstration problem being greater than 360 ° of angles.
the utility model overcomes the technical scheme that its technical matters adopts:
A kind of circular protractor, comprise body, body is provided with rectangular coordinate system, body edges is provided with the angle index of 0-360 °, described body is connected and composed by folding by two semicircular bodies; The center of circle of body is connected with pointer, body is provided with annular chute, pointer is provided with the slide block mated with chute.
Conveniently stir pointer, described pointer is also provided with shifting block.
the beneficial effects of the utility model are:
Circular protractor of the present utility model, first, facilitates teacher to demonstrate to student; Secondly, easily can demonstrate 0 ° of angle is how to 360 ° of angles; 3rd, the demonstration problem being greater than 360 ° of angles can also be solved.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
In figure, 1, body, 2, rectangular coordinate system, 3, angle index, 4, folding, 5, pointer, 6, chute, 7, slide block, 8, shifting block.
Embodiment
Better understand the utility model for the ease of those skilled in the art, be described in further details below in conjunction with the drawings and specific embodiments to the utility model, following is only exemplary do not limit protection domain of the present utility model.
As shown in Figure 1, circular protractor of the present utility model, comprise body 1, body is provided with rectangular coordinate system 2, the center of circle of circular protractor is the initial point of rectangular coordinate system, and described rectangular coordinate system 2 comprises x-axis and y-axis, with x-axis positive dirction be 0 ° (360 °), y-axis positive dirction is 90 °, x-axis negative direction is 180 °, and y-axis negative direction is 270 °; Body edges is provided with the angle index 3 of 0-360 °, described body is connected and composed by folding 4 by two semicircular bodies, can fold up, be convenient for carrying storage time no; The center of circle of body is connected with pointer 5, pointer can rotate around the body center of circle, body is provided with annular chute 6, pointer is provided with the slide block 7 mated with chute, and such pointer slides by slide block 7 and indicates institute's measuring angle size in chute 6; Stir pointer for convenience, described pointer 5 is also provided with shifting block 8.
Protractor in the past can not be demonstrated such as the relation at 20 ° of angles and 380 ° of angles, use circular protractor of the present utility model, can easily demonstrate, 380 ° of angles are around 20 ° of angles one week, can find out that whole limit is identical, thus illustrate that the trigonometric function value at these two angles is equal.
Above only describes ultimate principle of the present utility model and preferred implementation, those skilled in the art can make many changes and improvements according to foregoing description, and these changes and improvements should belong to protection domain of the present utility model.

Claims (2)

1. a circular protractor, is characterized in that: comprise body (1), body is provided with rectangular coordinate system (2), body edges is provided with the angle index (3) of 0-360 °, and described body is connected and composed by folding (4) by two semicircular bodies; The center of circle of body is connected with pointer (5), body is provided with annular chute (6), pointer is provided with the slide block (7) mated with chute.
2. circular protractor according to claim 1, is characterized in that: described pointer (5) is also provided with shifting block (8).
CN201520477941.4U 2015-07-06 2015-07-06 Circular protractor Expired - Fee Related CN204757844U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201520477941.4U CN204757844U (en) 2015-07-06 2015-07-06 Circular protractor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201520477941.4U CN204757844U (en) 2015-07-06 2015-07-06 Circular protractor

Publications (1)

Publication Number Publication Date
CN204757844U true CN204757844U (en) 2015-11-11

Family

ID=54472545

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201520477941.4U Expired - Fee Related CN204757844U (en) 2015-07-06 2015-07-06 Circular protractor

Country Status (1)

Country Link
CN (1) CN204757844U (en)

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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
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20151111

Termination date: 20160706