CN209813548U - Drawing device for mathematics teaching - Google Patents
Drawing device for mathematics teaching Download PDFInfo
- Publication number
- CN209813548U CN209813548U CN201920457864.4U CN201920457864U CN209813548U CN 209813548 U CN209813548 U CN 209813548U CN 201920457864 U CN201920457864 U CN 201920457864U CN 209813548 U CN209813548 U CN 209813548U
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- motor
- rotating shaft
- drawing rule
- fastening rod
- chalk
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Abstract
The utility model discloses a mathematical education plotter, which comprises a motor, a rotating shaft coaxial with the shaft of the motor, a sucker connected with the front end of the rotating shaft, a handle fixedly connected with the rear end of the motor, a switch device used for controlling the motor, a battery connected with the motor and the switch device, and a plotting ruler with gear teeth I arranged on the side surface; the sucker can freely rotate relative to the rotating shaft; one end of the drawing rule is provided with a chalk clamp device used for fixing chalk, and the drawing rule and the rotating shaft are arranged in a separable mode. The technical problems that in the prior art, teachers need to manually draw circles and straight lines on a blackboard in primary and secondary school mathematical teaching, and workload of the teachers is increased are solved.
Description
Technical Field
The utility model relates to a plotter especially relates to a mathematical education plotter.
Background
In the process of primary school mathematics teaching, drawing is often needed in a classroom. Drawing for a primary school classroom usually draws figures on a smooth blackboard, and generally needs to draw straight lines, circles, rectangles, squares, diamonds and corners. At present, the workload of teachers is large, and the workload of teachers can be increased when the teachers draw pictures in class; in addition, teachers need to carry various drawing devices such as rulers, compasses, set squares and the like in the drawing process, and carrying is very inconvenient; some teachers who are just engaged are not skilled in using drawing instruments such as rulers and compasses for drawing on the blackboard, so that the drawing speed is slow, and drawn figures are not standard. If a portable automatic drawing tool which is convenient to operate is adopted, the workload of teachers is greatly reduced, and the teachers can be used for drawing conveniently.
Therefore, there is a need for improvement of the prior art to solve the above technical problems.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model aims at providing a mathematical education plotter solves the technical problem that needs the artifical hand drawing of teacher when primary and secondary school's mathematical education draws circle, straight line on the blackboard in prior art. The method is realized by the following technical scheme:
the designed drawing instrument for mathematical teaching comprises a motor, a rotating shaft coaxial with a shaft of the motor, a sucker connected with the front end of the rotating shaft, a handle rigidly connected with the rear end of the motor, a switching device used for controlling the motor, a battery connected with the motor and the switching device, and a drawing ruler with gear teeth I arranged on the side surface, wherein the central axis of the rotating shaft is superposed with the central axis of the shaft of the motor, and the rotating shaft is driven to synchronously rotate along with the shaft of the motor when the motor works; the sucker can freely rotate relative to the rotating shaft, the blackboard is generally provided with a smooth board surface, when the motor works to drive the rotating shaft to rotate, the sucker positioned at the front end of the rotating shaft can be adsorbed on the blackboard, at the moment, a handle at the rear end of the motor can be held by hands, and the motor and the sucker can be kept static when the rotating shaft rotates; the drawing rule is arranged separately from the motor, the rotating shaft, the handle, the sucker and the like, and can be arranged into a rod with a cuboid main body and a chalk clamp device arranged at one end; the rotary shaft comprises a groove penetrating through the side surface of the rotary shaft, a fastening device and a fixing device, the rotary shaft can be arranged into a cylinder, one bottom surface of the cylinder is connected with the sucker, the other bottom surface of the cylinder is connected with the shaft of the motor, the side surface of the rotary shaft is provided with the groove, the size of the groove can enable the drawing ruler to penetrate through, and a gap still exists between the drawing ruler and the upper surface of the groove after the drawing ruler penetrates through the groove; the side surface of the rotating shaft is provided with a gear tooth II which can be arranged closer to the sucking disc than the groove and surrounds the side surface of the cylindrical rotating shaft for a circle; the fastening device is used for fixing the relative position of the drawing rule and the groove when the drawing rule penetrates through the rotating shaft through the groove, the fastening device can fix the drawing rule penetrating through the groove, at the moment, if the rotating shaft rotates, the chalk clamp device at the front end of the drawing rule can make circumferential rotation by taking the intersection point of a plane perpendicular to the central axis of the rotating shaft and the central axis of the rotating shaft as a central point, and the fixing device is used for controlling the linear motion of the drawing rule when the gear teeth I and the gear teeth II of the drawing rule are meshed and the rotating shaft rotates; the chalk clamp device is used for controlling the chalk to draw a circle on the blackboard when the fastening device fixes the relative position of the drawing ruler and the rotating shaft rotates, or controlling the chalk to draw a straight line on the blackboard when the gear teeth I are meshed with the gear teeth II and the rotating shaft rotates.
Furthermore, the fastening device comprises a hole which is arranged on the side surface of the rotating shaft and communicated with the groove, a fastening rod capable of moving up and down in the hole, a spring connected with the fastening rod, a fixing frame connected with the spring and a pawl, wherein the center line of the hole can be vertically arranged with the center line of the groove and the central axis of the rotating shaft, the fastening rod can pass through the hole, and the lower end of the fastening rod is positioned in the groove; the fastening rod is used for enabling the drawing rule to freely move in the groove along the direction perpendicular to the central axis of the rotating shaft when the drawing rule penetrates through the groove and the fastening rod is positioned at the uppermost part, and when the fastening rod is positioned at the lowermost part and the drawing rule penetrates through the rotating shaft through the groove, the lowermost end of the fastening rod applies downward force to the upper surface of the drawing rule to fix the relative position of the drawing rule and the rotating shaft so that the front end of the drawing rule is driven to do circular motion when the rotating shaft rotates; the spring is used for applying upward force to the fastening rod when the fastening rod is positioned at the lowest part; the pawl is used for controlling the tighrening rod to move downwards when the pawl contacts with the tighrening rod, the tighrening rod can move upwards along the central line direction of the hole when the pawl separates from the tighrening rod, the pawl can be hinged with the fixing frame by one end, the other end is connected with the tighrening rod under the normal condition, the side surface of the tighrening rod can be provided with a gear tooth III, the pawl can contact with the gear tooth III, the control tighrening rod can only move downwards, the pawl can be manually lifted, the tighrening rod is separated from the tighrening rod, if the tighrening rod is at the bottom at the moment, the tighrening rod can move upwards under the action of.
Furthermore, the fixing device comprises a positioning frame, a turnover cover and a roller connected with the turnover cover, the positioning frame can be connected with the motor, and when the rotating shaft rotates, the positioning frame is static relative to the motor; when flip closure and the teeth of a cogwheel I and teeth of a cogwheel II mesh, the last surface contact of running roller and drawing rule, the teeth of a cogwheel I of drawing rule and the teeth of a cogwheel II meshing of rotation axis and rotation axis rotation this moment, the front end of drawing rule is linear motion under fixing device's control, and the running roller can reduce the resistance that fixing device produced the drawing rule at this motion in-process.
Furthermore, the drawing device for mathematical education further comprises a transparent 360-degree angle dial which is connected with the motor and takes the shaft of the motor as the center, after one straight line of the chalk is controlled by the chalk clamp, the other straight line of the chalk is controlled by rotating the angle of the motor and the fixing frame, and the included angle of the two straight lines can be controlled by the transparent dial.
Furthermore, the switch device comprises a power switch for controlling the opening and closing of the motor and a speed switch for controlling the rotating speed of the motor, the rotating shaft is generally thin, one circle can be drawn by rotating the rotating shaft for one circle, but the rotating shaft can draw a straight line on the blackboard only by rotating for multiple circles, and the rotating shaft can rotate at a low speed when the chalk clip device controls the chalk to draw the circle and rotate at a high speed when the straight line is drawn by controlling the speed switch.
Further, switching device sets up on the handle, adsorbs on the blackboard and when handheld handle fixed motor at the sucking disc, whether the axle of more convenient control motor is rotatory and the speed of rotation.
Furthermore, the chalk clamp device comprises a fixing ring and a fastening screw which is arranged on the fixing ring and used for fixing the chalk, and the force of the chalk clamp device for fixing the chalk can be controlled, so that the chalk clamp device is not easy to fall off in the chalk drawing control process.
Further, the gear teeth I are arranged on the lower surface of the drawing ruler, the length scales are arranged on the upper surface of the drawing ruler, the length from the chalk to the rotating shaft can be known by observing the scales on the drawing ruler, the length of the straight line can be controlled when the device draws a straight line, if a rectangle needs to be drawn, the straight line with the length of l can be drawn by controlling the scale on the drawing rule, then the motor and the fixing device are rotated, by observing the 360-degree angle dial, drawing a straight line with the length of L, which is vertical to the straight line with the length of L, then moving the sucker, fixing the motor at the other end of the straight line with the length of L, drawing a straight line which is vertical to the straight line with the length of L and is on the same side with the straight line with the length of L, finally moving the sucker, drawing a straight line to connect the graphs into a rectangle, if a small gap exists between the two straight lines due to the sucking disc, the chalk can be held by a hand to connect the gap; in a similar way, by controlling the length and the included angle of the straight line, the device can draw various patterns such as squares, rhombuses and the like.
The utility model discloses an actively profitable technological effect includes:
(1) when primary school classroom teaching needs to be drawn on a blackboard again, a teacher does not need to manually draw a picture, and the drawing can be completed only by controlling a motor, so that the teaching working intensity of the teacher is reduced;
(2) various figures such as circles, straight lines, included angles, rectangles, squares, diamonds and the like can be drawn, and the drawing requirements of primary school teaching are basically met;
(3) the drawing ruler can be used as a pointer when drawing is not needed, and the pointer does not need to be carried;
(4) the device has simple structure, convenient operation and convenient maintenance and replacement;
other advantageous effects of the present invention will be further described with reference to the following embodiments.
Drawings
The invention will be further described with reference to the following figures and examples:
fig. 1 is a perspective view of the fixing device of the present invention when fixing a drawing rule;
fig. 2 is a perspective view of the fastening device of the present invention when fixing the drawing rule;
fig. 3 shows the fastening device of the present invention 1: 8, enlarged perspective view;
fig. 4 shows the fixing device of the present invention 1: 4, enlarged perspective view;
in the figure, 1, a motor; 2. a suction cup; 3. a handle; 4. a switching device; 5. gear teeth I; 6. a drawing rule; 7. A chalk clamp device; 8. a groove; 9. gear teeth II; 10. an aperture; 11. a fastening rod; 12. a spring; 13. a fixed mount; 14. a pawl; 15. gear teeth III; 16. a positioning frame; 17. a cover is turned; 18. a roller; 19. a 360 degree angle dial; 20. a rotating shaft.
Detailed Description
Example (b): a kind of mathematics teaching plotter, as shown in fig. 1-4, including the electrical machinery 1, the rotating shaft 20 coaxial with axle of the electrical machinery 1, the sucking disc 2 connected with front end of the rotating shaft 20, the hand grip 3 rigidly connected with rear end of the electrical machinery 1, the switching device 4 used for controlling the electrical machinery 1, the battery and side that connect with electrical machinery 1 and switching device 4 have drawing rule 6 of the teeth of a cogwheel I5, in the figure, one end that the electrical machinery 1, rotating shaft 20 close to the sucking disc 2 is the front end, one end far away from the sucking disc 2 is the rear end, the battery can be set up inside the hand grip 3, the central axis of the rotating shaft 20 coincides with central axis of the axle of the electrical machinery 1, when the electrical machinery 1 works, drive the rotating shaft 20 to rotate with; the sucker 2 can freely rotate relative to the rotating shaft 20, the blackboard usually has a smooth board surface, when the motor 1 works to drive the rotating shaft 20 to rotate, the sucker 2 positioned at the front end of the rotating shaft 20 can be sucked on the blackboard, at the moment, the handle 3 at the rear end of the motor 1 can be held by hand, and the motor 1 and the sucker 2 can be kept static when the rotating shaft 20 rotates; the drawing rule 6 is arranged separately from the motor 1, the rotating shaft 20, the handle 3, the sucker 2 and the like, and the drawing rule 6 can be arranged into a rod with a cuboid main body and a chalk clamp device 7 arranged at one end; the rotary shaft 20 is provided with a groove 8 penetrating through the side surface of the rotary shaft 20, the rotary shaft 20 further comprises a fastening device and a fixing device, the rotary shaft 20 can be arranged to be a cylinder, one bottom surface of the cylinder is connected with the sucker 2, the other bottom surface of the cylinder is connected with the shaft of the motor 1, the side surface of the cylinder is provided with the groove 8, the size of the groove 8 can enable the drawing rule 6 to penetrate through, and a gap still exists between the drawing rule 6 and the upper surface of the groove 8 after the drawing rule 6; the side surface of the rotating shaft 20 is provided with a gear tooth II9, the gear tooth II9 can be arranged closer to the suction cup 2 than the groove 8, and circles around the side surface of the cylindrical rotating shaft 20; the fastening device is used for fixing the relative position of the drawing rule 6 and the groove 8 when the drawing rule 6 penetrates through the rotating shaft 20 through the groove 8, when the fastening device is used for fixing the drawing rule 6 penetrating through the groove 8, if the rotating shaft 20 rotates, the chalk clamp device 7 at the front end of the drawing rule 6 can rotate circularly by taking the intersection point of a plane perpendicular to the central axis of the rotating shaft 20 and the central axis of the rotating shaft 20 as a circle center, and the fastening device is used for controlling the drawing rule 6 and the chalk clamp device 7 to move linearly when the gear teeth I5 of the drawing rule 6 are meshed with the gear teeth II9 and the rotating shaft 20 rotates; the chalk holder device 7 is used for controlling the chalk to draw a circle on the blackboard when the fastening device fixes the relative position of the drawing rule 6 and the rotating shaft 20 rotates, or controlling the chalk to draw a straight line on the blackboard when the gear tooth I5 is engaged with the gear tooth II9 and the rotating shaft 20 rotates.
In this embodiment, the fastening device includes a hole 10 disposed on the side of the rotating shaft 20 and communicated with the slot 8, a fastening rod 11 capable of moving up and down in the hole 10, a spring 12 connected with the fastening rod 11, a fixing frame 13 connected with the spring 12, and a pawl 14, the center line of the hole 10 may be disposed perpendicular to the center line of the slot 8 and the central axis of the rotating shaft 20, the fastening rod 11 may pass through the hole 10, and the lower end is located in the slot 8; the fastening rod 11 is used for controlling the drawing rule 6 to freely move in the direction perpendicular to the central axis of the rotating shaft 20 in the groove 8, namely, in the direction of the central line of the groove 8 when the drawing rule 6 passes through the groove 8 and the fastening rod 11 is positioned at the top, and when the fastening rod 11 is positioned at the bottom and the drawing rule 6 passes through the groove 8 and passes through the rotating shaft 20, the lowest end of the fastening rod 11 applies downward force to the upper surface of the drawing rule 6 to fix the relative position of the drawing rule 6 and the rotating shaft 20, so that when the rotating shaft 20 rotates, the front end of the drawing rule 6 is driven to do circular motion, and further, the chalk fixed on the chalk clamp device 7 is driven to draw a circle; the spring 12 is used for applying an upward force to the fastening rod 11 when the fastening rod 11 is located at the lowest position; the pawl 14 is used for controlling the fastening rod 11 to move downwards when the pawl 14 is in contact with the fastening rod 11, the fastening rod 11 can move upwards along the central line direction of the hole 10 when the pawl 14 is separated from the fastening rod 11, one end of the pawl 14 can be hinged with the fixed frame 13, the other end of the pawl 14 can be in contact with the fastening rod 11 under normal conditions, the side surface of the fastening rod 11 can be provided with a gear tooth III15, the pawl 14 can be in contact with the gear tooth III15, the fastening rod 11 can be controlled to move downwards, the pawl 14 can be lifted manually, the pawl 14 is separated from the fastening rod 11, if the fastening rod 11 is at the lowest position at the moment, the fastening rod 11 can move upwards under the action of the spring 12, and the fastening rod 11 returns to the uppermost position.
In this embodiment, the fixing device includes a positioning frame 16, a flip cover 17 and a roller 18 connected with the flip cover 17, the positioning frame 16 can be connected with the motor 1, and when the rotating shaft 20 rotates, the positioning frame 16 is stationary relative to the motor 1; when flip 17 is closed and the teeth of a cogwheel I5 and the meshing of teeth II9, running roller 18 and drawing rule 6's upper surface contact, the teeth of a cogwheel I5 of drawing rule 6 and the teeth of a cogwheel II9 meshing of rotation axis 20 and rotation axis 20 rotate this moment, drawing rule 6 also rotates, drive running roller 18 simultaneously and rotate, linear motion is made under fixing device's control to the front end of drawing rule 6, running roller 18 can reduce the resistance that fixing device produced drawing rule 6 in this motion process.
In this embodiment, the drawing instrument for mathematical education further includes a transparent 360-degree angle scale 19 connected to the motor 1 and having the shaft of the motor 1 as the center axis, and after the chalk clip controls one straight line of the chalk, the drawing rule 6 and the other straight line of the chalk are controlled by rotating the angle of the motor 1 and the fixing frame 13, and the included angle between the two straight lines can be controlled by the transparent scale.
In this embodiment, the switch device 4 includes a power switch for controlling the on and off of the motor 1 and a speed switch for controlling the rotation speed of the motor 1, and generally, the rotation shaft 20 is thin, and the rotation shaft 20 can draw a circle after rotating for one circle, but the rotation shaft 20 needs to rotate for multiple circles to draw a straight line on the blackboard, and the speed switch can be controlled to enable the chalk clip device 7 to control the rotation shaft 20 to rotate slowly when the chalk circles are drawn, and to rotate quickly when the chalk circles are drawn.
In this embodiment, switching device 4 sets up on handle 3, adsorbs on the blackboard and when handheld handle 3 fixed motor 1 at sucking disc 2, whether the axle of more convenient control motor 1 is rotatory and the speed of rotation.
In this embodiment, the chalk clip device 7 includes a fixing ring and a fastening screw arranged on the fixing ring and used for fixing chalk, and the force for fixing chalk by the chalk clip device 7 can be controlled, so that the chalk clip device 7 is not easy to fall off in the process of controlling chalk drawing.
In this embodiment, the gear teeth I are disposed on the lower surface of the drawing rule 6, the length scale is disposed on the upper surface of the drawing rule 6, the length from the chalk to the rotation axis 20 can be known by observing the scale on the drawing rule 6, the length of the straight line can be controlled when the device draws the straight line, if a rectangle needs to be drawn, a straight line with length L can be drawn through the scale on the drawing rule 6, the motor 1 and the fixing device are rotated, the 360 ° angle dial 19 is observed, a straight line with length L perpendicular to the straight line with length L is drawn, the suction cup 2 is moved, the motor 1 is fixed at the other end of the straight line with length L, a straight line perpendicular to the straight line with length L and on the same side as the straight line with length L is drawn, the suction cup 2 is moved finally, a straight line is drawn to connect the figure into a rectangle, if a small gap exists between the two straight lines due, the chalk can be held by hands to connect the gaps; in a similar way, by controlling the length and the included angle of the straight line, the device can draw various patterns such as squares, rhombuses and the like.
The implementation process comprises the following steps: in the teaching process of primary mathematics classroom, if needing to draw a circle on a blackboard, a fastening device can be used for fixing a drawing rule 6 in a groove 8, a chalk clamp device 7 can be used for fixing chalk, one end of the chalk is in contact with the blackboard, the distance from the chalk in the chalk clamp device 7 to the central shaft of a motor 1 can be controlled through the scales on the drawing rule 6, the radius of the drawn circle is also controlled, a rotating shaft 20 is controlled to rotate, and the chalk draws a circle on the blackboard; if a straight line is drawn on the blackboard again, the fixing device can be used for fixing the drawing rule 6, the gear tooth I5 is meshed with the gear tooth II9, the chalk clamp device 7 is used for fixing the chalk, one end of the chalk is in contact with the blackboard, the length of the drawn straight line can be controlled through the scales on the drawing rule 6, the rotating shaft rotates, and the chalk draws a straight line on the blackboard; if an angle needs to be drawn on the blackboard, after the device is used for controlling the chalk to draw a straight line on the blackboard, the motor 1 is rotated by taking the central axis of the rotating shaft 20 as a central axis, then a straight line is drawn, and the included angle between the two straight lines is controlled by observing the transparent 360-degree angle dial 19; if a cuboid needs to be drawn, a straight line with the length of L can be drawn through the scale control on the drawing rule 6, the motor 1 and the fixing device are rotated, the 360-degree angle dial 19 is observed, a straight line with the length of L and perpendicular to the straight line with the length of L is drawn, then the sucker 2 is moved, the motor 1 is fixed at the other end of the straight line with the length of L, a straight line which is perpendicular to the straight line with the length of L and on the same side with the straight line with the length of L is drawn, finally the sucker 2 is moved, a straight line is drawn to connect the figure into a rectangle, and if a small gap exists between the two straight lines due to the sucker 2, a chalk can be held by a; in a similar way, by controlling the length and the included angle of the straight line, the device can draw various patterns such as squares, rhombuses and the like.
Finally, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the present invention can be modified or replaced by other means without departing from the spirit and scope of the present invention, which should be construed as limited only by the appended claims.
Claims (8)
1. A plotter for mathematical education, characterized in that: the device comprises a motor, a rotating shaft coaxial with a shaft of the motor, a sucker connected with the front end of the rotating shaft, a handle fixedly connected with the rear end of the motor, a switch device used for controlling the motor, a battery connected with the motor and the switch device, and a drawing ruler with gear teeth I arranged on the side surface; the sucker can freely rotate relative to the rotating shaft; one end of the drawing rule is provided with a chalk clamp device for fixing chalk, and the drawing rule and the rotating shaft are arranged in a separable way;
the rotating shaft comprises a groove penetrating through the side surface of the rotating shaft, a fastening device and a fixing device; the rotation axis side is provided with teeth of a cogwheel II, fastener is used for fixing the relative position of drawing rule and rotation axis when the drawing rule runs through the rotation axis through the groove, fixing device is used for controlling drawing rule rectilinear motion when the teeth of a cogwheel I and the meshing of teeth of a cogwheel II and rotation axis of drawing rule are rotatory.
2. A mathematical education plotter as claimed in claim 1, wherein: the fastening device comprises a hole which is arranged on the side surface of the rotating shaft and communicated with the groove, a fastening rod which can move up and down in the hole, a spring connected with the fastening rod, a fixed frame connected with the spring and a pawl; the fastening rod is used for controlling the drawing rule to freely move in the groove along the direction vertical to the central shaft of the rotating shaft when the fastening rod is positioned at the uppermost part, and applying downward force to the upper surface of the drawing rule when the fastening rod is positioned at the lowermost part and the drawing rule passes through the rotating shaft through the groove; the spring is used for applying upward force to the fastening rod when the fastening rod is positioned at the lowest part; the side surface of the fastening rod is provided with a gear tooth III, the pawl is used for controlling the fastening rod to move downwards when the pawl is in contact with the gear tooth III, and the fastening rod can move upwards when the pawl is separated from the fastening rod.
3. A mathematical education plotter as claimed in claim 2, wherein: fixing device includes the locating rack be connected with the motor, with locating rack articulated flip and the running roller be connected with flip for when flip is closed and the teeth of a cogwheel I with teeth of a cogwheel II meshing the upper surface contact of running roller and drawing rule.
4. A mathematical education plotter as claimed in claim 3, wherein: the device also comprises a transparent 360-degree angle dial which is connected with the motor and takes the shaft of the motor as a central shaft.
5. A mathematical education plotter as claimed in claim 4, characterized by: the switching device includes a power switch for controlling the motor to be turned on and off and a speed switch for controlling the shaft rotation speed of the motor.
6. A mathematical education plotter as claimed in claim 5, wherein: the switch device is arranged on the handle.
7. A mathematical education plotter as claimed in claim 6, wherein: the chalk clamp device comprises a fixing ring and a fastening screw which is arranged on the fixing ring and used for fixing chalk.
8. A mathematical education plotter as claimed in claim 7, wherein: teeth of a cogwheel I sets up the lower surface at the drawing rule, and the drawing rule upper surface is provided with the length scale.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920457864.4U CN209813548U (en) | 2019-04-04 | 2019-04-04 | Drawing device for mathematics teaching |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920457864.4U CN209813548U (en) | 2019-04-04 | 2019-04-04 | Drawing device for mathematics teaching |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209813548U true CN209813548U (en) | 2019-12-20 |
Family
ID=68878791
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920457864.4U Expired - Fee Related CN209813548U (en) | 2019-04-04 | 2019-04-04 | Drawing device for mathematics teaching |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209813548U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112172387A (en) * | 2020-09-27 | 2021-01-05 | 安徽理工大学 | Mathematical modeling teaching aid |
| CN112428726A (en) * | 2020-11-27 | 2021-03-02 | 绥化学院 | Plotter for applied mathematics teaching |
-
2019
- 2019-04-04 CN CN201920457864.4U patent/CN209813548U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112172387A (en) * | 2020-09-27 | 2021-01-05 | 安徽理工大学 | Mathematical modeling teaching aid |
| CN112428726A (en) * | 2020-11-27 | 2021-03-02 | 绥化学院 | Plotter for applied mathematics teaching |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20191220 Termination date: 20210404 |
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| CF01 | Termination of patent right due to non-payment of annual fee |