CN107301808A - A kind of adjustable mathematics rectangle change demonstration teaching aid - Google Patents
A kind of adjustable mathematics rectangle change demonstration teaching aid Download PDFInfo
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- CN107301808A CN107301808A CN201710698069.XA CN201710698069A CN107301808A CN 107301808 A CN107301808 A CN 107301808A CN 201710698069 A CN201710698069 A CN 201710698069A CN 107301808 A CN107301808 A CN 107301808A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- G09B23/00—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes
- G09B23/02—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for mathematics
- G09B23/04—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for mathematics for geometry, trigonometry, projection or perspective
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Abstract
The present invention relates to a kind of mathematics teaching aid, in particular it is a kind of adjustable mathematics rectangle change demonstration teaching aid, including fixed holder assembly, change control assembly, width change component and rotating bar, device can form the length rectangle that Trapezoidal is not continually changing, or form the rectangle that length, width are continually changing, be easy to student deeper into this knowledge point of understanding rectangle.Described change control assembly is fixedly connected on fixed holder assembly, and width change component is fixedly connected in change control assembly, is slidably matched between width change component and fixed holder assembly, rotating bar is movably connected in the upper end of width change component.Right base ring is identical with left base ring size, and right base ring is structure as a whole with left base ring, and the upper end of right base ring and left base ring is welded with two arc bumps.
Description
Technical field
In particular it is a kind of adjustable mathematics rectangle change demonstration teaching aid the present invention relates to a kind of mathematics teaching aid.
Background technology
A kind of Patent No. CN201420135297.8 edge of a knife rectangle chi with grid type straight flute basal plane, this practicality is new
Type discloses a kind of edge of a knife rectangle chi with grid type straight flute basal plane, and general structure is more flat cuboid, and its feature exists
In, including：Edge of a knife measuring surface, grid type straight flute basal plane and thermal insulation board respectively have two, compared with existing edge of a knife rectangle chi, in base
Crisscross grid type straight flute is machined with the smooth rectangle plane in face, the basal plane of existing edge of a knife rectangle chi is not being reduced
In the case of length, the effective area of basal plane can be significantly decreased, before formal measurement, only cleaning need to be slightly carried out,
Then the edge of a knife rectangle chi that several lower the utility model that gently rub are provided, it is possible to viscous chip, dust, oil on the contact surface
The pollutants such as stain are expressed in grid type straight flute, finally just can directly carry out follow-up measurement process.After so improving,
The cleaning intensity before measurement is not only reduced, and improves measurement effect and measurement accuracy.This ruler can only be showed
The rectangle of fixed size.
The content of the invention
The present invention provides a kind of adjustable mathematics rectangle change demonstration teaching aid, and its advantage is that device can form length
The rectangle that Trapezoidal is not continually changing, or form the rectangle that length, width are continually changing, be easy to student deeper into understanding square
This knowledge point of shape.
In particular it is a kind of adjustable mathematics rectangle change demonstration teaching aid the present invention relates to a kind of mathematics teaching aid, bag
Fixed holder assembly, change control assembly, width change component and rotating bar are included, device can form length, and Trapezoidal does not become constantly
The rectangle of change, or form the rectangle that length, width are continually changing, be easy to student deeper into this knowledge point of understanding rectangle.
Described change control assembly is fixedly connected on fixed holder assembly, and width change component is fixedly connected on change control
On component processed, it is slidably matched between width change component and fixed holder assembly, rotating bar is movably connected in width change component
Upper end.
Described fixation holder assembly is left by channel bar, rectangular channel, right base ring, arc bump, the right groove of channel bar, left base ring, channel bar
Groove, right apical ring, labeled slots, annulus, contiguous block, left apical ring, right annular groove and left annular groove composition, right base ring and left base ring structure and knot
Structure is identical with size, and right base ring is structure as a whole with left base ring, and it is convex that the upper end of right base ring and left base ring is welded with two arcs
Formed between block, two arc bumps of right-hand member and the left groove of channel bar, channel bar are formed between the right groove of channel bar, two arc bumps of left end
Right groove is symmetrical arranged with the left groove of channel bar, and rectangular channel is provided with channel bar, and the left end of channel bar is fixed in the left groove of channel bar, the right side of channel bar
End is fixed in the right groove of channel bar, and right apical ring is identical with structure snd size with the structure of left apical ring, and right apical ring and left apical ring are integrated
Two labeled slots are symmetrically arranged with structure, right apical ring and left apical ring, annulus there are two, and two annulus are distinguished by contiguous block
It is connected on right apical ring and left apical ring, right annular groove is formed between right apical ring and annulus, left annular groove is formed between annulus and left apical ring,
Right apical ring is fixedly connected on two arc bumps of right-hand member, and left apical ring is fixedly connected on two arc bumps of left end.
Described change control assembly is by long slide bar, right sliding shoe, auris dextra plate, rack slide bar, left sliding shoe, gear, a left side
Otic placode, locating dowel, positioning post holes, rack, long slide bar connecting rod and rack I compositions, right sliding shoe and the left sliding shoe company of slip
It is connected on long slide bar, is fixedly connected with right sliding shoe on auris dextra plate, auris dextra plate and is fixedly connected with rack slide bar, one end of rack
It is inserted on rack slide bar, rack is provided with trip bolt, left sliding shoe in rack slide bar position and is fixedly connected with left otic placode, it is left
Locating dowel is fixedly connected with otic placode, the centre position of long slide bar is connected with gear, and gear can be rotated about the axis thereof, tooth
Bar I is fixedly connected on left sliding shoe, wheel and rack I engagements, and the positioning post holes of correspondence locating dowel is provided with rack, long to slide
The two ends of bar are fixedly connected with long slide bar connecting rod, and two long slide bar connecting rod is fixedly connected on the two ends of channel bar.
Described width change component is made up of cylinder, double flute block, square connecting rod and perpendicular round and smooth post, and the upper end of cylinder is fixed
Double flute block is connected with, the upper and lower ends of double flute block are provided with the groove of counterparty's connecting rod, and two square connecting rods are inserted in double flute block
Upper and lower ends, be respectively connected with the perpendicular round and smooth post vertical with square connecting rod in two square connecting rods, two are erected round and smooth posts positioned at justifying
The both sides of post, width change component has two, and two width change components are respectively welded at right sliding shoe, left slip by cylinder
The upper end of block, two perpendicular round and smooth posts of right-hand member are inserted in right annular groove, and two perpendicular round and smooth posts of left end are inserted in left annular groove.
Slip is provided with described rotating bar ties up seat, special fastening screw I, rubber band and tie up post I, special fastening screw
II, rubber band tie up post II and a chute is tied up in slip, and slip, which ties up seat and is inserted in slip, is tied up on a chute, and the upper end that rubber band ties up post I is set
Special fastening screw I is equipped with, special fastening screw I is threadedly attached in slip and tied up on seat, and one end of rotating bar passes through screw thread
Special fastening screw II is connected with, special fastening screw II upper end is provided with rubber band and ties up post II, and rotating bar has four, turned
Lever is connected to four upper ends for erecting round and smooth post by special fastening screw II.
The distance between described right base ring and the left base ring center of circle, equal to when locating dowel insertion positioning post holes when, right slip
The distance between block and left sliding shoe vertical direction center line.
Described four erect the upper surface of round and smooth post at grade.
A kind of of the invention adjustable mathematics rectangle change demonstration teaching aid has the beneficial effect that：
A kind of adjustable mathematics rectangle change demonstration teaching aid of the present invention, device can form length, and Trapezoidal is not continually changing
Rectangle, or form the rectangle that length, width are continually changing, be easy to student deeper into this knowledge point of understanding rectangle.
Brief description of the drawings
The present invention will be further described in detail with specific implementation method below in conjunction with the accompanying drawings.
Fig. 1 is a kind of structural representation of adjustable mathematics rectangle change demonstration teaching aid of the present invention；
Fig. 2 is the structural representation one of fixed holder assembly；
Fig. 3 is the structural representation two of fixed holder assembly；
Fig. 4 is the structural representation three of fixed holder assembly；
Fig. 5 is the structural representation of change control assembly；
Fig. 6 is the structural representation of width change component；
Fig. 7 is the structural representation of rotating bar.
In figure：Fixed holder assembly 1；Channel bar 1-1；Rectangular channel 1-2；Right base ring 1-3；Arc bump 1-4；The right groove 1-5 of channel bar；
Left base ring 1-6；The left groove 1-7 of channel bar；Right apical ring 1-8；Labeled slots 1-9；Annulus 1-10；Contiguous block 1-11；Left apical ring 1-12；Right ring
Groove 1-13；Left annular groove 1-14；Change control assembly 2；Long slide bar 2-1；Right sliding shoe 2-2；Auris dextra plate 2-3；Rack slide bar 2-4；
Left sliding shoe 2-5；Gear 2-6；Left otic placode 2-7；Locating dowel 2-8；Position post holes 2-9；Rack 2-10；Long slide bar connecting rod 2-
11；Rack I2-12；Width change component 3；Cylinder 3-1；Double flute block 3-2；Square connecting rod 3-3；Erect round and smooth post 3-4；Rotating bar 4；
A 4-1 is tied up in slip；Special fastening screw I4-2；Rubber band ties up post I4-3；Special fastening screw II4-4；Rubber band ties up post II4-
5；A chute 4-6 is tied up in slip.
Embodiment
Embodiment one：
Illustrate present embodiment with reference to Fig. 1-7, be in particular that one kind can the present invention relates to a kind of mathematics teaching aid
Adjust mathematics rectangle change demonstration teaching aid, including fixed holder assembly 1, change control assembly 2, width change component 3 and rotating bar
4, device can form the length rectangle that Trapezoidal is not continually changing, or the rectangle that formation length, width are continually changing, and be easy to
Student deeper into this knowledge point of understanding rectangle.
Described change control assembly 2 is fixedly connected on fixed holder assembly 1, and width change component 3 is fixedly connected on change
Change in control assembly 2, be slidably matched between width change component 3 and fixed holder assembly 1, rotating bar 4 is movably connected in width change
Change the upper end of component 3.
Described fixation holder assembly 1 is by channel bar 1-1, rectangular channel 1-2, right base ring 1-3, arc bump 1-4, the right groove 1- of channel bar
5th, the left groove 1-7 of left base ring 1-6, channel bar, right apical ring 1-8, labeled slots 1-9, annulus 1-10, contiguous block 1-11, left apical ring 1-12, the right side
Annular groove 1-13 and left annular groove 1-14 compositions, right base ring 1-3 is identical with left base ring 1-6 structure snd size, right base ring 1-3 and left base ring
It is structure as a whole, right base ring 1-3 and left base ring 1-6 upper end are welded with two arc bump 1-4, and two arcs of right-hand member are convex
Formed between block 1-4 and the left groove 1-7 of channel bar, the right groove 1-5 of channel bar are formed between the right groove 1-5 of channel bar, two arc bump 1-4 of left end
It is symmetrical arranged with the left groove 1-7 of channel bar, rectangular channel 1-2 is provided with channel bar 1-1, channel bar 1-1 left end is bonded in the left groove 1-7 of channel bar
Interior, channel bar 1-1 right-hand member is fixed in the right groove 1-5 of channel bar, and right apical ring 1-8 is identical with left apical ring 1-12 structure snd size, right
Apical ring 1-8 and left apical ring 1-12 are structure as a whole, and two labeled slots 1- are symmetrically arranged with right apical ring 1-8 and left apical ring 1-12
9, labeled slots 1-9 serve the effect of mark position, and annulus 1-10 has two, and two annulus 1-10 are distinguished by contiguous block 1-11
It is welded to connect on right apical ring 1-8 and left apical ring 1-12, right annular groove 1-13, annulus is formed between right apical ring 1-8 and annulus 1-10
Left annular groove 1-14, two arc bump 1-4s of the right apical ring 1-8 bonding connections in right-hand member are formed between 1-10 and left apical ring 1-12
On, left apical ring 1-12 bonding connections are on two arc bump 1-4 of left end.
Described change control assembly 2 is by long slide bar 2-1, right sliding shoe 2-2, auris dextra plate 2-3, rack slide bar 2-4, left cunning
Motion block 2-5, gear 2-6, left otic placode 2-7, locating dowel 2-8, positioning post holes 2-9, rack 2-10, long slide bar connecting rod 2-11 and tooth
Bar I2-12 is constituted, and right sliding shoe 2-2 and left sliding shoe 2-5 are slidably connected on long slide bar 2-1, fixed on right sliding shoe 2-2
It is connected with and rack slide bar 2-4, rack 2-10 one end is fixedly connected with auris dextra plate 2-3, auris dextra plate 2-3 is inserted in rack slide bar 2-
On 4, rack 2-10 is provided with trip bolt, left sliding shoe 2-5 in rack slide bar 2-4 positions and is fixedly connected with left otic placode 2-7,
The centre position that locating dowel 2-8, long slide bar 2-1 are fixedly connected with left otic placode 2-7 is connected with gear 2-6, and gear 2-6 can
To rotate about the axis thereof, rack I2-12 is fixedly connected on left sliding shoe 2-5, and gear 2-6 is engaged with rack I2-12, rack 2-
The two ends that correspondence locating dowel 2-8 positioning post holes 2-9, long slide bar 2-1 are provided with 10 are fixedly connected with long slide bar connecting rod 2-
11, slide bar connecting rod 2-11 two long is fixedly connected on channel bar 1-1 two ends.
Described width change component 3 is made up of cylinder 3-1, double flute block 3-2, side connecting rod 3-3 and perpendicular round and smooth post 3-4,
Cylinder 3-1 upper end bonding connection has double flute block 3-2, and double flute block 3-2 upper and lower ends are provided with the logical of counterparty's connecting rod 3-3
Groove, two side connecting rod 3-3 are inserted on double flute block 3-2 upper and lower ends, two square connecting rod 3-3 and are respectively connected with and square connecting rod
The perpendicular round and smooth post 3-4 of 3-3 vertically, two are erected the both sides that round and smooth post 3-4 is located at cylinder 3-1, and width change component 3 has two, two
Individual width change component 3 is respectively welded at right sliding shoe 2-2, left sliding shoe 2-5 upper end, two of right-hand member by cylinder 3-1
Erect round and smooth post 3-4 to be inserted in right annular groove 1-13, two perpendicular round and smooth post 3-4 of left end are inserted in left annular groove 1-14.
Be provided with described rotating bar 4 slip tie up a 4-1, special fastening screw I4-2, rubber band tie up post I4-3, it is special
Fastening screw II4-4, rubber band tie up post II4-5 and a chute 4-6 is tied up in slip, and slip, which ties up a 4-1 and is inserted in slip, ties up a chute 4-6
On, the upper end that rubber band ties up post I4-3 is welded with special fastening screw I4-2, and special fastening screw I4-2 is threadedly attached in
Slip is tied up on a 4-1, and slip can be tied up a 4-1 and fixed by special fastening screw I4-2, and one end of rotating bar 4 is connected through a screw thread
There are special fastening screw II4-4, special fastening screw II4-4 that rotating bar 4 can be fixed on to perpendicular round and smooth post 3-4 upper end, it is special
Different fastening screw II4-4 upper end is welded with rubber band and ties up post II4-5, and rotating bar 4 has four, and rotating bar 4 passes through special tight
Gu screw I I4-4 is connected to four upper ends for erecting round and smooth post 3-4, rubber band ties up post I4-3 and rubber band ties up post II4-5 and is used for tying up
Rubber band, rubber band can form rectangle and supply student viewing.
The distance between described right base ring 1-3 and the left base ring 1-6 centers of circle, equal to when locating dowel 2-8 insertion positioning post holes
During 2-9, rubber band can so be formed square by the distance between right sliding shoe 2-2 and left sliding shoe 2-5 vertical direction center lines
The length of shape is fixed.
Described four erect round and smooth post 3-4 upper surface at grade, and four points in one plane, are easy to be formed
Rectangle.
A kind of operation principle of adjustable mathematics rectangle change demonstration teaching aid of the present invention：When use device is demonstrated, by four
Erect round and smooth post 3-4 to align with four labeled slots 1-9 respectively, at this moment promote rack 2-10 that locating dowel 2-8 is inserted in into positioning post holes 2-9
It is interior, any one cylinder 3-1 is at this moment moved, the cylinder 3-1 on the left side drives two, the left side to erect round and smooth post 3-4 on left annular groove 1-14
Slide, the cylinder 3-1 on the right drives two, the right to erect round and smooth post 3-4 and slided on right annular groove 1-13, post is tied up in four rubber bands
Tied up on II4-5 into rubber band, form rectangle, at this moment the length of rectangle is constant, and width is continually changing with slip；It is perpendicular round and smooth by four
Post 3-4 aligns with four labeled slots 1-9 respectively, promotes rack 2-10 to be engaged with gear 2-6, at this moment moves right sliding shoe 2-2, right
Sliding shoe 2-2 band carry-over bar 2-10 movements, because rack 2-10 is engaged with gear 2-6, gear 2-6 is engaged with rack I2-12, institute
When being moved with right sliding shoe 2-2, left sliding shoe 2-5 can sliding shoe 2-2 moving directions to the right reverse movement, the cylinder 3- on the left side
1 two, the drive left side is erected round and smooth post 3-4 and slided on left annular groove 1-14, and the cylinder 3-1 on the right drives two, the right to erect round and smooth post
3-4 is slided on right annular groove 1-13, is tied up in four rubber bands and the length that rectangle, at this moment rectangle are formed into rubber band is tied up on post II4-5
Degree and width are all as slip is continually changing；Rotating bar 4 can be rotated on round and smooth post 3-4 is erected, and a 4-1 is tied up in slip can be perpendicular
Slidable adjustment position on round and smooth post 3-4, ties up a 4-1 slip by slip and turns to diverse location, in special fastening screw I4-2
On tie up into rubber band formation rectangle, more various sizes of rectangles can be formed.
Certainly, described above not limitation of the present invention, the present invention is also not limited to the example above, the art
The variations, modifications, additions or substitutions that those of ordinary skill is made in the essential scope of the present invention, fall within the guarantor of the present invention
Protect scope.
Claims (7)
1. a kind of adjustable mathematics rectangle change demonstration teaching aid, including fixed holder assembly (1), change control assembly (2), width change
Change component (3) and rotating bar (4), it is characterised in that：Described change control assembly (2) is fixedly connected on fixed holder assembly (1)
On, width change component (3) is fixedly connected in change control assembly (2), width change component (3) and fixed holder assembly (1)
Between be slidably matched, rotating bar (4) is movably connected in the upper end of width change component (3).
2. a kind of adjustable mathematics rectangle change demonstration teaching aid according to claim 1, it is characterised in that：Described fixation
Holder assembly (1) is by channel bar (1-1), rectangular channel (1-2), right base ring (1-3), arc bump (1-4), the right groove of channel bar (1-5), left bottom
Ring (1-6), the left groove of channel bar (1-7), right apical ring (1-8), labeled slots (1-9), annulus (1-10), contiguous block (1-11), left apical ring
(1-12), right annular groove (1-13) and left annular groove (1-14) composition, right base ring (1-3) are identical with left base ring (1-6) structure snd size,
Right base ring (1-3) is structure as a whole with left base ring (1-6), and the upper end of right base ring (1-3) and left base ring (1-6) is welded with two
The right groove of channel bar (1-5), two arc bumps of left end are formed between arc bump (1-4), two arc bumps (1-4) of right-hand member
The left groove of channel bar (1-7) is formed between (1-4), the right groove of channel bar (1-5) is symmetrical arranged with the left groove of channel bar (1-7), set on channel bar (1-1)
Rectangular channel (1-2) is equipped with, the left end of channel bar (1-1) is fixed in the left groove of channel bar (1-7), and the right-hand member of channel bar (1-1) is fixed on groove
In the right groove of bar (1-5), right apical ring (1-8) is identical with the structure snd size of left apical ring (1-12), right apical ring (1-8) and left apical ring
(1-12) is structure as a whole, and two labeled slots (1-9), annulus are symmetrically arranged with right apical ring (1-8) and left apical ring (1-12)
(1-10) has two, and two annulus (1-10) are connected to right apical ring (1-8) and left apical ring (1- by contiguous block (1-11)
12) on, form right annular groove (1-13) between right apical ring (1-8) and annulus (1-10), annulus (1-10) and left apical ring (1-12) it
Between form left annular groove (1-14), right apical ring (1-8) is fixedly connected on two arc bumps (1-4) of right-hand member, left apical ring (1-
12) it is fixedly connected on two arc bumps (1-4) of left end.
3. a kind of adjustable mathematics rectangle change demonstration teaching aid according to claim 2, it is characterised in that：Described change
Control assembly (2) is by long slide bar (2-1), right sliding shoe (2-2), auris dextra plate (2-3), rack slide bar (2-4), left sliding shoe (2-
5), gear (2-6), left otic placode (2-7), locating dowel (2-8), positioning post holes (2-9), rack (2-10), long slide bar connecting rod (2-
11) constituted with rack I (2-12), right sliding shoe (2-2) and left sliding shoe (2-5) are slidably connected on long slide bar (2-1), it is right
It is fixedly connected with sliding shoe (2-2) on auris dextra plate (2-3), auris dextra plate (2-3) and is fixedly connected with rack slide bar (2-4), rack
The one end of (2-10) is inserted on rack slide bar (2-4), and rack (2-10) is provided with trip bolt in rack slide bar (2-4) position,
It is fixedly connected with left sliding shoe (2-5) on left otic placode (2-7), left otic placode (2-7) and is fixedly connected with locating dowel (2-8), it is long to slide
The centre position of bar (2-1) is connected with gear (2-6), and gear (2-6) can be rotated about the axis thereof, and rack I (2-12) is solid
Surely it is connected on left sliding shoe (2-5), gear (2-6) is engaged with rack I (2-12), correspondence positioning is provided with rack (2-10)
The positioning post holes (2-9) of post (2-8), the two ends of long slide bar (2-1) are fixedly connected with long slide bar connecting rod (2-11), two long cunnings
Bar connecting rod (2-11) is fixedly connected on channel bar (1-1) two ends.
4. a kind of adjustable mathematics rectangle change demonstration teaching aid according to claim 3, it is characterised in that：Described width
Change component (3) is made up of cylinder (3-1), double flute block (3-2), square connecting rod (3-3) and perpendicular round and smooth post (3-4), cylinder (3-1)
Upper end be fixedly connected with double flute block (3-2), the upper and lower ends of double flute block (3-2) are provided with the logical of counterparty's connecting rod (3-3)
Groove, two square connecting rods (3-3) are inserted on double flute block (3-2) upper and lower ends, two square connecting rods (3-3) and are respectively connected with and side
The vertical perpendicular round and smooth post (3-4) of connecting rod (3-3), two are erected the both sides that round and smooth post (3-4) is located at cylinder (3-1), width change
Component (3) has two, and two width change components (3) are respectively welded at right sliding shoe (2-2), left slip by cylinder (3-1)
The upper end of block (2-5), two perpendicular round and smooth posts (3-4) of right-hand member are inserted in right annular groove (1-13), and two of left end erect round and smooth post (3-
4) it is inserted in left annular groove (1-14).
5. a kind of adjustable mathematics rectangle change demonstration teaching aid according to claim 4, it is characterised in that：Described rotation
Slip is provided with bar (4) ties up seat (4-1), special fastening screw I (4-2), rubber band and tie up post I (4-3), special fastening screw II
(4-4), rubber band tie up post II (4-5) and a chute (4-6) is tied up in slip, and slip, which ties up seat (4-1) and is inserted in slip, ties up a chute (4-6)
On, the upper end that rubber band ties up post I (4-3) is provided with special fastening screw I (4-2), and special fastening screw I (4-2) passes through screw thread
It is connected to slip to tie up on seat (4-1), one end of rotating bar (4) has been connected through a screw thread special fastening screw II (4-4), special tight
Gu screw I I (4-4) upper end is provided with rubber band and ties up post II (4-5), rotating bar (4) has four, and rotating bar (4) passes through spy
Different fastening screw II (4-4) is connected to four upper ends for erecting round and smooth post (3-4).
6. a kind of adjustable mathematics rectangle change demonstration teaching aid according to claim 3, it is characterised in that：Described right bottom
The distance between ring (1-3) and left base ring (1-6) center of circle, equal to when locating dowel (2-8) insertion positioning post holes (2-9) when, right cunning
The distance between motion block (2-2) and left sliding shoe (2-5) vertical direction center line.
7. a kind of adjustable mathematics rectangle change demonstration teaching aid according to claim 4, it is characterised in that：Described four
Erect the upper surface of round and smooth post (3-4) at grade.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710698069.XA CN107301808B (en) | 2017-08-15 | 2017-08-15 | A kind of adjustable mathematics rectangle change demonstration teaching aid |
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|---|---|---|---|
| CN201710698069.XA CN107301808B (en) | 2017-08-15 | 2017-08-15 | A kind of adjustable mathematics rectangle change demonstration teaching aid |
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| CN107301808A true CN107301808A (en) | 2017-10-27 |
| CN107301808B CN107301808B (en) | 2019-04-26 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109360486A (en) * | 2018-11-14 | 2019-02-19 | 沈书怡 | A kind of economic statistics study statistical data diagrammatic representation platform |
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| US4890839A (en) * | 1988-10-03 | 1990-01-02 | Erik Ayotte | Adjustable frame for puzzles |
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| CN205247715U (en) * | 2015-12-29 | 2016-05-18 | 吉林工程技术师范学院 | Angle relation demonstration teaching aid |
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| CN109360486A (en) * | 2018-11-14 | 2019-02-19 | 沈书怡 | A kind of economic statistics study statistical data diagrammatic representation platform |
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| CN107301808B (en) | 2019-04-26 |
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