CN204382966U - A kind of blackboard cotton rope ruler compass - Google Patents
A kind of blackboard cotton rope ruler compass Download PDFInfo
- Publication number
- CN204382966U CN204382966U CN201520000850.1U CN201520000850U CN204382966U CN 204382966 U CN204382966 U CN 204382966U CN 201520000850 U CN201520000850 U CN 201520000850U CN 204382966 U CN204382966 U CN 204382966U
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- CN
- China
- Prior art keywords
- bobbin
- spring axis
- cotton rope
- ruler
- enwinding spring
- 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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Abstract
The utility model discloses a kind of blackboard cotton rope ruler compass, provide a kind of method not only can drawn circle but also straight line can be drawn on blackboard, it comprises ruler, magnet, lid, wind spring, bobbin, enwinding spring axis, locking plate, cotton rope and chalk composition, ruler one end is with circular hole, circular magnet is placed with in circular hole, enwinding spring axis one end is fixed on lid, the other end is connected with locking plate, enwinding spring axis is wound with wind spring, wind spring one end is fixed on enwinding spring axis, the other end is connected with bobbin, bobbin is a thin walled cylinder body, be arranged on enwinding spring axis, and leave gap between bobbin and enwinding spring axis, object is to reduce the friction of bobbin when enwinding spring axis rotates.Cotton rope one end is fixed on bobbin, and the other end is equipped with rope sling, for fixing chalk.Cotton rope long enough, does not draw bowlder and is just wound on bobbin.Locking plate is arranged on the other end of enwinding spring axis, for the stop to wind spring.The utility model is can at blackboard upper drawing circle and straight line, and structure is simple, easy to use, cheap.
Description
Technical field
The utility model relates to teaching equipment field, is specifically related to a kind of new type blackboard cotton rope ruler compass.
Background technology
At present, well-known compasses have two pin, and a tape has needle point, and another tape has chalk, also have a handle being used for rotating.Draw circle time, finger to hold handle and firmly pin band needle point a pin inactive, a pin of rotating band chalk, just can draw a circle.In the process, firmly a little bit smaller a little, will slide and cause the center of circle to change the circle can not drawing a standard in a pin of band needle point and the center of circle, if firmly excessive, needle point will damage blackboard, and therefore traditional bipod compasses exist a lot of drawback at blackboard upper drawing circle.For this reason, through thinking deeply for a long time and groping, traditional compasses comprehensively studied and innovates, and making compasses and ruler be combined into a kind of novel Multifunctional teaching aid.
Summary of the invention
The inconvenience of bowlder is drawn in order to overcome existing bipod compasses, the utility model provides a kind of cotton rope ruler compass, this cotton rope ruler compass can not only facilitate and quickly and accurately at blackboard upper drawing circle, and can also draw straight line, and its structure is simple, compact, easy to operate, cheap.
For reaching above-mentioned purpose, a kind of blackboard cotton rope of the utility model ruler compass, comprise ruler, described ruler is the round-meshed rule in one end, circular magnet is placed with in described circular hole, magnet cap is provided with above described circular magnet, described magnet cap is provided with enwinding spring axis, described enwinding spring axis is the slender axles that there is blind screw hole one end, solid one end of described enwinding spring axis is fixed in described magnet cap, the solid-section external cylindrical surface of enwinding spring axis is wound with wind spring, wind spring inner edge is fixed on described enwinding spring axis, outside and the inwall being connected to a bobbin, described bobbin is a thin walled cylinder body, one section of described excircle of sleeve cylinder is the flank of tooth, another section is smooth, cylindrical peripheral surface, the smooth, cylindrical peripheral surface of described bobbin is provided with cotton rope, described cotton rope end is provided with rope sling, for fixing chalk, stop lid is provided with above described bobbin, the end face of described stop lid has a hole, inwall one end circumference geared surface, be contained in the described stop lid inwall circumference flank of tooth and described bobbin flank engagement on described enwinding spring axis thus stop described bobbin to rotate, described stop lid runs through a screw by the hole of its end face and is anchored in described enwinding spring axis blind screw hole, prevent excessive the moving axially of described stop lid.
Wherein said magnet cap is fixed on the top of described ruler circular hole.
The axial line of wherein said enwinding spring axis is by the center of circle of described circular magnet.
The utility model blackboard cotton rope ruler compass difference from prior art is that the utility model achieves following technique effect:
1, the utility model blackboard cotton rope ruler compass ruler and compasses unite two into one, and do not draw bowlder, and cotton rope is just received in the box of stop lid, are equivalent to a common ruler, and structure is simple, is easy to carry;
2, the utility model blackboard cotton rope ruler compass circular magnet relies on magnetic-adsorption on blackboard, the center of drawing bowlder circular magnet as the center of circle, to blackboard without any damage;
3, the utility model blackboard cotton rope ruler compass is using cotton rope length as radius of a circle, cotton rope is cheap, goes bad also conveniently replaced, cheap, uses economy;
4, the utility model blackboard cotton rope ruler compass stop lid stop bobbin rotates, thus just accurately decides as the length of the cotton rope of radius of circle, and in picture circle process, length remains unchanged, and is conducive to the accuracy of picture circle;
5, the utility model blackboard cotton rope ruler compass is after the center of circle and radius are decided, and grasps chalk in the rope sling of cotton rope one end and rotates, just can at blackboard upper drawing circle, easy to operate.
Below in conjunction with accompanying drawing, the utility model is described in further detail.
Accompanying drawing explanation
Fig. 1 the utility model blackboard cotton rope ruler compass profile.
Fig. 2 the utility model blackboard cotton rope ruler compass STRUCTURE DECOMPOSITION figure.
Description of reference numerals: 1. ruler, 2. circular magnet, 3. magnet cap, 4. enwinding spring axis, 5. wind spring, 6. bobbin, 7. stop lid, 8. screw, 9. cotton rope, 10. chalk.
Detailed description of the invention
Below in conjunction with drawings and Examples, to above-mentioned being described in more detail with other technical characteristic and advantage of the utility model.
As shown in Figure 1 and Figure 2, a kind of blackboard cotton rope of the utility model ruler compass, comprises ruler 1, circular magnet 2, magnet cap 3, enwinding spring axis 4, wind spring 5, bobbin 6, stop lid 7, screw 8, cotton rope 9, chalk 10.Ruler 1 is a round-meshed rule in one end, scale is in order to measure radius of a circle, circular magnet 2 is placed with in circular hole, circular magnet 2 is adsorbed on blackboard as the center of circle for drawing bowlder, magnet cap 3 is fixed on above ruler circular hole, for the sealing to circular magnet 2, enwinding spring axis 4 is slender axles that there is blind screw hole one end, solid one end of enwinding spring axis 4 is fixed in magnet cap 3, and the axial line of enwinding spring axis 4 is by the center of circle of circular magnet 2, the solid-section external cylindrical surface of enwinding spring axis 4 is wound with wind spring 5, wind spring 5 is while be fixed on enwinding spring axis 4, another side is connected with bobbin 6 inwall, bobbin 6 is a thin walled cylinder body, one section of excircle of sleeve cylinder is the flank of tooth, another section is smooth, cylindrical peripheral surface and external diameter is smaller, one end of cotton rope 9 is fixed on the smooth, cylindrical peripheral surface of bobbin 6, the other end is equipped with rope sling, for fixing chalk 10, the end face of stop lid 7 has a hole, inwall one end circumference geared surface, to be contained on enwinding spring axis 4 and to be positioned at above bobbin 6, the stop lid 7 inwall circumference flank of tooth can with bobbin 6 flank engagement thus stop bobbin 6 rotate, screw 8 is fastened in the blind screw hole of enwinding spring axis 4, prevent excessive the moving axially of stop lid 7.
The utility model blackboard cotton rope ruler compass is at picture bowlder, and the first step relies on the magnetic force of circular magnet 2 to be adsorbed on blackboard by ruler 1, and the center of circular magnet 2 is as drawing the round center of circle; Second step fastens chalk 10 on the rope sling of cotton rope 9, pull-out cotton rope 9, and length is measured to drawn radius of a circle on the scale of ruler 1, and now press stop lid 7 and stop bobbin 6 to rotate, such radius of a circle is just fixed up; 3rd step is with circular magnet 2 center for the center of circle, and with cotton rope 9 length for radius, holding chalk 10 just can at blackboard upper drawing circle; 4th step is drawn round complete, and move up stop lid 7, removes the stopping effect to bobbin 6, and bobbin 6 shrinks with wind spring 5 and does return motion, thus cotton rope 9 is just wound on bobbin 6.When cotton rope 9 is on bobbin 6, ruler now, as other common rulers, can draw straight line easily on blackboard; The utility model can at blackboard upper drawing circle and straight line, and easy to use, structure is simple, and cost is low.
Above-described embodiment is only be described preferred embodiment of the present utility model; not scope of the present utility model is limited; under the prerequisite not departing from the utility model design spirit; the various distortion that those of ordinary skill in the art make the technical solution of the utility model and improvement, all should fall in protection domain that the utility model claims determine.
Claims (3)
1. a blackboard cotton rope ruler compass, it is characterized in that: comprise ruler, described ruler is the round-meshed rule in one end, circular magnet is placed with in described circular hole, magnet cap is provided with above described circular magnet, described magnet cap is provided with enwinding spring axis, described enwinding spring axis is the slender axles that there is blind screw hole one end, solid one end of described enwinding spring axis is fixed in described magnet cap, the solid-section external cylindrical surface of enwinding spring axis is wound with wind spring, wind spring inner edge is fixed on described enwinding spring axis, outside and the inwall being connected to a bobbin, described bobbin is a thin walled cylinder body, one section of described excircle of sleeve cylinder is the flank of tooth, another section is smooth, cylindrical peripheral surface, the smooth, cylindrical peripheral surface of described bobbin is provided with cotton rope, described cotton rope end is provided with rope sling, for fixing chalk, stop lid is provided with above described bobbin, the end face of described stop lid has a hole, inwall one end circumference geared surface, be contained in the described stop lid inwall circumference flank of tooth and described bobbin flank engagement on described enwinding spring axis thus stop described bobbin to rotate, described stop lid runs through a screw by the hole of its end face and is anchored in described enwinding spring axis blind screw hole, prevent excessive the moving axially of described stop lid.
2. blackboard cotton rope ruler compass according to claim 1, is characterized in that: described magnet cap is fixed on the top of described ruler circular hole.
3. blackboard cotton rope ruler compass according to claim 1, is characterized in that: the axial line of described enwinding spring axis is by the center of circle of described circular magnet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520000850.1U CN204382966U (en) | 2015-01-04 | 2015-01-04 | A kind of blackboard cotton rope ruler compass |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520000850.1U CN204382966U (en) | 2015-01-04 | 2015-01-04 | A kind of blackboard cotton rope ruler compass |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204382966U true CN204382966U (en) | 2015-06-10 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520000850.1U Expired - Fee Related CN204382966U (en) | 2015-01-04 | 2015-01-04 | A kind of blackboard cotton rope ruler compass |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204382966U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105015229A (en) * | 2015-07-28 | 2015-11-04 | 杨柳青 | Circle drawing tool set |
| CN111688384A (en) * | 2020-06-24 | 2020-09-22 | 贵州电网有限责任公司 | Mobile field work pen clip and using method thereof |
-
2015
- 2015-01-04 CN CN201520000850.1U patent/CN204382966U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105015229A (en) * | 2015-07-28 | 2015-11-04 | 杨柳青 | Circle drawing tool set |
| CN111688384A (en) * | 2020-06-24 | 2020-09-22 | 贵州电网有限责任公司 | Mobile field work pen clip and using method thereof |
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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: 20150610 Termination date: 20180104 |