CN204496785U - A kind of sliding chord length apparatus for demonstrating - Google Patents
A kind of sliding chord length apparatus for demonstrating Download PDFInfo
- Publication number
- CN204496785U CN204496785U CN201520200698.1U CN201520200698U CN204496785U CN 204496785 U CN204496785 U CN 204496785U CN 201520200698 U CN201520200698 U CN 201520200698U CN 204496785 U CN204496785 U CN 204496785U
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- locating piece
- threaded hole
- pedestal
- slipping block
- bolt
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Abstract
The utility model discloses a kind of sliding chord length apparatus for demonstrating, belong to mathematics circle instructional device field, mainly solve in current mathematical education and the teaching of this part of string of circle is difficult to inherently understand the definition of string and the problem of character, pedestal is center of circle plate structure, pedestal edge placement is provided with circular T-slot, slide gauge one end is provided with locating piece, described locating piece top and slide gauge are integral type structural design, locating piece shaft section is identical with the T-slot shaft section of pedestal edge placement, locating piece shaft core position is provided with threaded hole, slipping block is cylindrical structural, slipping block shaft core position is provided with threaded hole, slippage bolt coordinates with the threaded hole on slipping block, slipping block axial section shape is identical with the T-slot shaft section base section of pedestal edge placement.The utility model can realize any variation of chord length with fixing, immediately can demonstrate the change procedure of chord length simultaneously, better meet the explanation for the properties of chord length in teaching process in displaying process.
Description
Technical field
The utility model relates to a kind of sliding chord length apparatus for demonstrating, belongs to mathematical teaching apparatus field.
Background technology
Circle is a kind of geometric figure.When a line segment planar rotates a circle around its end points, the track of its another end points is called circle.According to definition, usually carry out picture circle with compasses.Radius length with circle inner circle is forever identical, and circle is with or without several radiuses with without several diameters.Circle is rotational symmetry, centrosymmetric image.Axis of symmetry is the straight line at diameter place.Meanwhile, circle is again " just unlimited polygon ", and " infinitely " just concept.When polygonal limit number is more, its shape, girth, area are just all got over close to circle (this is also why the so-called circle of people is regular polygon).So do not have real circle in the world, circle is conceptual figure in fact just.Circle is found by Ancient Greek Mathematics man Pythagoras.The line segment connecting the upper any two points of circle is called string, and the string through the center of circle is called diameter, and diameter is string the longest in a circle.
In current mathematical education, normally traditional instruction is adopted for the teaching process of this part of string of circle, namely on blackboard, simple drafting is shown, but although simple the having no idea of this process allows student understand the differentiation of string in change procedure, be difficult to definition and the character of inherently understanding string.
Utility model content
The utility model normally adopts traditional instruction in current mathematical education for the teaching process of this part of string of circle, namely on blackboard, simple drafting is shown, although but simple the having no idea of this process allows student understand the differentiation of string in change procedure, be difficult to inherently understand the definition of string and the problem of character, devise a kind of sliding chord length apparatus for demonstrating.
The technical scheme in the invention for solving the technical problem is:
This a kind of sliding chord length apparatus for demonstrating, its structure comprises: pedestal, slide gauge, locating piece, slippage bolt, slipping block, bolt, pedestal is center of circle plate structure, pedestal upper surface is uniformly distributed scale along axis annular, pedestal edge placement is provided with circular T-slot, slide gauge is elongate configuration, slide gauge is provided with elongate slots along its length, slide gauge one end is provided with locating piece, described locating piece top and slide gauge are integral type structural design, the right cylinder that locating piece is not waited by two sections of external diameters is formed, locating piece shaft section is identical with the T-slot shaft section of pedestal edge placement, locating piece shaft core position is provided with threaded hole, bolt coordinates with the threaded hole on locating piece, slipping block is cylindrical structural, slipping block shaft core position is provided with threaded hole, slippage bolt coordinates with the threaded hole on slipping block, slipping block axial section shape is identical with the T-slot shaft section base section of pedestal edge placement.
Described bolt is identical with the threaded hole screw thread specification on locating piece, and the reach of bolt is greater than the hole depth of the threaded hole on locating piece.
The groove width of described slide gauge elongate slots is along its length greater than the nominal diameter of slippage bolt, is less than the nut width of slippage bolt.
Described pedestal upper surface annular is provided with scale, and described scale is cloudy quarter, is provided with scale along slide gauge upper surface length direction, and described scale is cloudy quarter.
Described slippage bolt is identical with the threaded hole screw thread specification on slipping block, and the reach of slippage bolt is greater than the hole depth of the threaded hole on slipping block.
Compared with prior art, the beneficial effects of the utility model are:
1. the utility model is novel unique, design ingenious, any variation of chord length can be realized with fixing, meet the requirement to the definition of string in teaching process, immediately can demonstrate the change procedure of chord length simultaneously in displaying process, better meet the explanation for the properties of chord length in teaching process.
2. the utility model structure is simple, and easy to make, material is cheap, and cost of manufacture is low, and application is wide, can be applied in classroom teaching, utilize location structure can realize the instant location of slide gauge.
Accompanying drawing explanation
Fig. 1 is the utility model one-piece construction figure.
Fig. 2 is the utility model rank vertical views.
Fig. 3 is the utility model cut-open view.
In figure: 1 pedestal, 2 slide gauges, 21 locating pieces, 3 slippage bolts, 31 slipping blocks, 4 bolts.
Embodiment
As shown in Figure 1, 2, 3: a kind of sliding chord length apparatus for demonstrating, its structure comprises: pedestal 1, slide gauge 2, locating piece 21, slippage bolt 3, slipping block 31, bolt 4, pedestal 1 is center of circle plate structure, pedestal 1 upper surface is uniformly distributed scale along axis annular, pedestal 1 edge placement is provided with circular T-slot, slide gauge 2 is elongate configuration, slide gauge 2 is provided with elongate slots along its length, slide gauge 2 one end is provided with locating piece 21, described locating piece 21 top and slide gauge 2 are integral type structural design, the right cylinder that locating piece 21 is not waited by two sections of external diameters is formed, locating piece 21 shaft section is identical with the T-slot shaft section of pedestal 1 edge placement, locating piece 21 shaft core position is provided with threaded hole, bolt 4 coordinates with the threaded hole on locating piece 21, slipping block 31 is cylindrical structural, slipping block 31 shaft core position is provided with threaded hole, slippage bolt 3 coordinates with the threaded hole on slipping block 31, slipping block 31 axial section shape is identical with the T-slot shaft section base section of pedestal 1 edge placement, described bolt 4 is identical with the threaded hole screw thread specification on locating piece 21, and the reach of bolt 4 is greater than the hole depth of the threaded hole on locating piece 21, the groove width of described slide gauge 2 elongate slots is along its length greater than the nominal diameter of slippage bolt 3, is less than the nut width of slippage bolt 3, described pedestal 1 upper surface annular is provided with scale, and described scale is cloudy quarter, is provided with scale along slide gauge 2 upper surface length direction, and described scale is cloudy quarter, described slippage bolt 3 is identical with the threaded hole screw thread specification on slipping block 31, and the reach of slippage bolt 3 is greater than the hole depth of the threaded hole on slipping block 31.
The sliding chord length apparatus for demonstrating of one described by the present embodiment, during use, pedestal 1 is placed and desktop position, then bolt 4 is rotated, after bolt 4 screws out locating piece 21, bolt 4 end contacts with the bottom land of the T-slot of pedestal 1 edge placement, continue to rotate the locking that bolt 4 realizes slide gauge 2 end, now rotation-sliding bolt 3 after rotation slide gauge 2 other end to correct position, slippage bolt 3 end contacts with the bottom land of the T-slot of pedestal 1 edge placement, continuing rotation-sliding bolt 3 utilizes coordinating between slipping block 31 with pedestal 1 to realize the locking of slide gauge 2 other end, now namely can read chord length value by the scale on pedestal 1 and slide gauge 2, slippage bolt 3 and bolt 4 is once unscrewed after use terminates, the utility model is novel unique, design ingenious, any variation of chord length can be realized with fixing, meet the requirement to the definition of string in teaching process, immediately can demonstrate the change procedure of chord length in displaying process simultaneously, better meet the explanation for the properties of chord length in teaching process, the utility model structure is simple, easy to make, material is cheap, cost of manufacture is low, application is wide, classroom teaching can be applied in, utilize location structure can realize the instant location of slide gauge 2.
The above, be only embodiment of the present utility model, and those of ordinary skill in the art are in the scope that the utility model discloses, and the change that can expect easily, within the protection domain that all should be encompassed in utility model.
Claims (5)
1. a sliding chord length apparatus for demonstrating, its structure comprises: pedestal (1), slide gauge (2), locating piece (21), slippage bolt (3), slipping block (31), bolt (4), it is characterized in that: pedestal (1) is center of circle plate structure, pedestal (1) upper surface is uniformly distributed scale along axis annular, pedestal (1) edge placement is provided with circular T-slot, slide gauge (2) is elongate configuration, slide gauge (2) is provided with elongate slots along its length, slide gauge (2) one end is provided with locating piece (21), described locating piece (21) top and slide gauge (2) are integral type structural design, the right cylinder that locating piece (21) is not waited by two sections of external diameters is formed, locating piece (21) shaft section is identical with the T-slot shaft section of pedestal (1) edge placement, locating piece (21) shaft core position is provided with threaded hole, bolt (4) coordinates with the threaded hole on locating piece (21), slipping block (31) is cylindrical structural, slipping block (31) shaft core position is provided with threaded hole, slippage bolt (3) coordinates with the threaded hole on slipping block (31), slipping block (31) axial section shape is identical with the T-slot shaft section base section of pedestal (1) edge placement.
2. the sliding chord length apparatus for demonstrating of one according to claim 1, it is characterized in that: described bolt (4) is identical with the threaded hole screw thread specification on locating piece (21), the reach of bolt (4) is greater than the hole depth of the threaded hole on locating piece (21).
3. the sliding chord length apparatus for demonstrating of one according to claim 1, is characterized in that: the groove width of described slide gauge (2) elongate slots is along its length greater than the nominal diameter of slippage bolt (3), is less than the nut width of slippage bolt (3).
4. the sliding chord length apparatus for demonstrating of one according to claim 1, is characterized in that: described pedestal (1) upper surface annular is provided with scale, and described scale is cloudy quarter, is provided with scale along slide gauge (2) upper surface length direction, and described scale is cloudy quarter.
5. the sliding chord length apparatus for demonstrating of one according to claim 1, it is characterized in that: described slippage bolt (3) is identical with the threaded hole screw thread specification on slipping block (31), the reach of slippage bolt (3) is greater than the hole depth of the threaded hole on slipping block (31).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520200698.1U CN204496785U (en) | 2015-04-05 | 2015-04-05 | A kind of sliding chord length apparatus for demonstrating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520200698.1U CN204496785U (en) | 2015-04-05 | 2015-04-05 | A kind of sliding chord length apparatus for demonstrating |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204496785U true CN204496785U (en) | 2015-07-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520200698.1U Expired - Fee Related CN204496785U (en) | 2015-04-05 | 2015-04-05 | A kind of sliding chord length apparatus for demonstrating |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204496785U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106205296A (en) * | 2016-07-21 | 2016-12-07 | 安徽省宿州市第二中学 | A kind of for verifying the instruments of inspection that oval latus rectum is the shortest |
| CN106373462A (en) * | 2016-12-07 | 2017-02-01 | 泸县奇峰镇学校 | Circle teaching aid for mathematics teaching |
| CN107038935A (en) * | 2017-04-11 | 2017-08-11 | 冯晟 | A kind of mathematical education parabola apparatus for demonstrating |
-
2015
- 2015-04-05 CN CN201520200698.1U patent/CN204496785U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106205296A (en) * | 2016-07-21 | 2016-12-07 | 安徽省宿州市第二中学 | A kind of for verifying the instruments of inspection that oval latus rectum is the shortest |
| CN106373462A (en) * | 2016-12-07 | 2017-02-01 | 泸县奇峰镇学校 | Circle teaching aid for mathematics teaching |
| CN107038935A (en) * | 2017-04-11 | 2017-08-11 | 冯晟 | A kind of mathematical education parabola apparatus for demonstrating |
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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: 20150722 Termination date: 20160405 |