CN212082215U

CN212082215U - Circumference measuring device for primary school mathematics

Info

Publication number: CN212082215U
Application number: CN202021336628.6U
Authority: CN
Inventors: 何艳霞
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-07-09
Filing date: 2020-07-09
Publication date: 2020-12-04
Anticipated expiration: 2030-07-09

Abstract

The utility model discloses a circumference measuring device for primary school mathematics, which comprises a measuring box shell, wherein an inner groove with a downward opening is arranged inside the measuring box shell, a sliding block is movably arranged inside the inner groove, and an accommodating mechanism is arranged inside the measuring box shell and is assembled to drive the sliding block to move along the vertical direction of the measuring box shell; the bottom of slider is provided with the scale, the activity is provided with the locating piece on the scale, the inside of locating piece is provided with positioning mechanism, positioning mechanism is assembled into and is worked as when the locating piece moves along the scale horizontal direction, makes its locking in arbitrary position. This circumference measuring device for primary school's mathematics can use circumference measuring device to measure the circumference and finish the back at the student, accomodates the slider to measuring box shell in to prevent that the student from being stabbed by the compasses point on the slider when taking circumference measuring device again and measuring the circumference.

Description

Circumference measuring device for primary school mathematics

Technical Field

The utility model relates to a teaching aid technical field specifically is a circumference measuring device is used to primary school's mathematics.

Background

When a pupil learns a figure such as a circle in mathematics, the pupil needs to use a circumference measuring device for drawing the figure, and when the existing circumference measuring device is used, the distance between two feet of the compasses is measured by a ruler to be used as a radius, then one end with a needle is fixed at one place to be used as a circle center, and finally one end with a pencil is rotated for one circle, so that the needed figure can be obtained.

However, the existing circumference measuring device for primary school mathematics finds that a student can be directly placed in a schoolbag sometimes after using stationery, when the student directly picks up the stationery from the schoolbag, a needle used for positioning the circle center on the surface of the circumference measuring device easily pricks the hand of the student to cause injury, and one end of the existing circumference measuring device with a pencil is easy to move when drawing, so that the circumference measuring effect is influenced.

In order to solve the problems, innovative design is urgently needed on the basis of the original circumference measuring device for primary mathematics.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a circumference measuring device is used to primary school's mathematics to the needle that provides current circumference measuring device for primary school's mathematics surface in solving above-mentioned background art and be used for fixing a position the centre of a circle stabs student's hand easily and causes the injury, and current circumference measuring device has the easy activity of one end of pencil when drawing, influences the problem of measuring the circumference effect.

Technical scheme

In order to achieve the above object, the utility model provides a following technical scheme: a circumference measuring device for primary mathematics comprises a measuring box shell, wherein an inner groove with a downward opening is formed in the measuring box shell, a sliding block is movably arranged in the inner groove, and a containing mechanism is arranged in the measuring box shell and is assembled to drive the sliding block to move along the vertical direction of the measuring box shell; the bottom of slider is provided with the scale, the activity is provided with the locating piece on the scale, the inside of locating piece is provided with positioning mechanism, positioning mechanism is assembled into and is worked as when the locating piece moves along the scale horizontal direction, makes its locking in arbitrary position.

Preferably, the inner walls of two opposite sides of the measuring box shell are provided with sliding chutes communicated with the inner groove, the top of each sliding chute is provided with an inner cavity communicated with the sliding chute, one adjacent side of each inner cavity is communicated with the adjacent side of the corresponding inner cavity, and the outer side of one inner cavity is provided with a groove communicated with the outer wall of the measuring box shell.

Preferably, the accommodating mechanism comprises a knob, a driving shaft and a driving gear, the knob is arranged in a groove formed in the outer wall of the measuring box shell, one end of the driving shaft is connected to the inner wall of the inner cavity of the groove, the other end of the driving shaft penetrates through the two inner cavities and is fixedly installed on the inner side of the knob, and the driving gear is fixedly installed on the outer wall of the driving shaft in the inner cavity respectively.

Preferably, the receiving mechanism further comprises a driven screw rod and a driven gear, one end of the driven screw rod is coupled to the bottom side of the sliding groove, and the driven gear is fixedly mounted at the other end of the driven screw rod and connected with the driving gear.

Preferably, the positioning mechanism comprises a positioning screw rod, the positioning block is adjacent to one side of the scale dial gauge, and a positioning groove is formed in one side of the scale dial gauge, and the positioning screw rod is movably arranged at the top of the positioning block.

Preferably, the bottom of the sliding block is provided with a compass tip, and the bottom of the positioning block is provided with a compass pen body which is positioned on the same vertical plane with the compass tip.

Compared with the prior art, the beneficial effects of the utility model are that:

1. this circumference measuring device is used to primary school's mathematics, when the student need use circumference measuring device to measure the circumference, at first will measure the knob anticlockwise rotation on the box shell outer wall, can pass through driving shaft drive driving gear anticlockwise rotation when the knob anticlockwise rotation, and through driven gear drive driven lead screw clockwise rotation, driven lead screw can drive the slider and move down along measuring the box shell this moment, after the slider removes to predetermined position, can be through the positioning lead screw anticlockwise rotation with on the locating piece, so that the locking state on the scale is relieved to the locating piece, then remove the locating piece and observe the scale on the scale with the radius of confirming the figure through the constant head tank, after the position of locating piece is confirmed, can clockwise rotation positioning lead screw, in order to fix the locating piece on the scale, can begin to carry out the figure drawing this moment.

2. This circumference measuring device for primary school mathematics, after the student used circumference measuring device to measure the circumference and finishes, will measure the knob clockwise rotation on the box shell outer wall, can pass through driving shaft drive driving gear clockwise rotation when the knob clockwise rotation to through driven gear drive driven lead screw counter-clockwise turning, driven lead screw can drive the slider along measuring box shell rebound this moment, after the slider removed to the inside groove, can accomodate measuring box shell to the schoolbag in.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

This document provides an overview of various implementations or examples of the technology described in this disclosure, and is not a comprehensive disclosure of the full scope or all features of the disclosed technology.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic front sectional view of the present invention;

FIG. 3 is a schematic view of the overall structure of the positioning block of the present invention;

FIG. 4 is a schematic view of the point A of FIG. 2 according to the present invention;

fig. 5 is a schematic structural diagram of point B in fig. 2 according to the present invention.

In the figure: 1. a measurement box housing; 2. an inner tank; 3. a chute; 4. an inner cavity; 5. a knob; 6. a drive shaft; 7. a driving gear; 8. a driven screw rod; 9. a driven gear; 10. a slider; 11. a compass tip; 12. a scale; 13. positioning blocks; 14. positioning a groove; 15. positioning a screw rod; 16. a compasses pen body; 17. a storage mechanism; 18. a positioning mechanism.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The use of the word "comprising" or "comprises", and the like, in this disclosure is intended to mean that the elements or items listed before that word, include the elements or items listed after that word, and their equivalents, without excluding other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may also include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.

To maintain the following description of the embodiments of the present disclosure clear and concise, a detailed description of known functions and known components have been omitted from the present disclosure.

Referring to fig. 1-5, the present invention provides a technical solution: a circumference measuring device for primary mathematics comprises a measuring box shell 1, an inner groove 2 with a downward opening is formed in the measuring box shell 1, a sliding block 10 is movably arranged in the inner groove 2, a containing mechanism 17 is arranged in the measuring box shell 1, and the containing mechanism 17 is assembled to drive the sliding block 10 to move along the vertical direction of the measuring box shell 1; the bottom of the slide block 10 is provided with a scale 12, a positioning block 13 is movably arranged on the scale 12, a positioning mechanism 18 is arranged inside the positioning block 13, the positioning mechanism 18 is assembled to enable the positioning block 13 to be locked at any position when moving along the horizontal direction of the scale 12, when students need to use a circumference measuring device to measure circumferences, firstly, the knob 5 on the outer wall of the measuring box shell 1 rotates anticlockwise, when the knob 5 rotates anticlockwise, the driving gear 7 can be driven by the driving shaft 6 to rotate anticlockwise, and the driven screw rod 8 can be driven by the driven gear 9 to rotate clockwise, at the moment, the driven screw rod 8 can drive the slide block 10 to move downwards along the measuring box shell 1, when the slide block 10 moves to a preset position, the positioning screw rod 15 on the positioning block 13 can be rotated anticlockwise, so that the positioning block 13 is unlocked on the scale 12, then the positioning block 13 is moved, and the scale on the scale 12 is observed through the positioning groove, after the position of locating piece 13 is determined, can clockwise rotation positioning screw 15, in order to fix locating piece 13 on scale 12, can begin to carry out the figure drawing this moment, simultaneously after measuring the circumference and finishing, will measure 5 clockwise rotations of knob on the box shell 1 outer wall, can drive driving gear 7 clockwise rotations through driving shaft 6 when 5 clockwise rotations of knob, and drive driven screw 8 counter-clockwise turning through driven gear 9, driven screw 8 can drive slider 10 along measuring box shell 1 rebound this moment, after slider 10 removed to inside groove 2, can accomodate to the schoolbag measuring box shell 1 in.

As shown in fig. 2, 4 and 5, the inner walls of two opposite sides of the measuring box shell 1 are provided with sliding grooves 3 communicated with the inner groove 2, the top of each sliding groove 3 is provided with an inner cavity 4 communicated with the sliding groove 3, one side of each of the two adjacent inner cavities 4 is communicated with the corresponding inner cavity, the outer side of one inner cavity 4 is provided with a groove communicated with the outer wall of the measuring box shell 1, and the structural design facilitates students to adjust the position of the sliding block 10 through the accommodating mechanism 17.

As shown in fig. 1, fig. 2, fig. 4 and fig. 5, receiving mechanism 17 includes knob 5, driving shaft 6 and driving gear 7, knob 5 sets up in the recess seted up on the outer wall of measurement box shell 1, the one end coupling of driving shaft 6 is on the inner wall of inner chamber 4 of relative recess wherein, the other end of driving shaft 6 runs through two inner chambers 4 and fixed mounting in the inboard of knob 5, driving gear 7 is fixed mounting respectively on the outer wall that driving shaft 6 is located inner chamber 4, foretell structural design can be when the student needs to use circumference measuring device to measure the circumference, through the counter clockwise turning of knob 5 on measuring box shell 1 outer wall, and through driving shaft 6 drive driving gear 7 counter clockwise turning during the counter clockwise turning of knob 5.

Wherein, receiving mechanism 17 still includes driven screw 8 and driven gear 9, and driven screw 8's one end coupling is in the bottom side of spout 3, and driven gear 9 fixed mounting is in driven screw 8's the other end to be connected with driving gear 7, foretell structural design can be when driving gear 7 anticlockwise rotation, and through driven gear 9 drive driven screw 8 clockwise rotation, driven screw 8 can drive slider 10 and follow and measure box shell 1 downstream this moment.

As shown in fig. 1-3, the positioning mechanism 18 includes a positioning screw 15, a positioning groove 14 is formed in one side of the positioning block 13 adjacent to the scale 12, the positioning screw 15 is movably disposed on the top of the positioning block 13, and the positioning screw 15 is designed to facilitate students to adjust the position of the positioning block 13 by observing the positioning groove 14, so as to measure the circumference.

The compasses pen body 16 is arranged on the bottom of the positioning block 13 and is positioned on the same vertical plane with the compasses tip 11, and the students can draw figures conveniently due to the structural design.

The working principle is as follows: when the device is used, as shown in fig. 1-5, when a student needs to use the circumference measuring device to measure the circumference, firstly, the knob 5 on the outer wall of the measuring box shell 1 is rotated anticlockwise, when the knob 5 is rotated anticlockwise, the driving gear 7 is driven to rotate anticlockwise through the driving shaft 6, and the driven screw 8 is driven to rotate clockwise through the driven gear 9, at this time, the driven screw 8 can drive the slider 10 to move downwards along the measuring box shell 1, when the slider 10 is moved to a preset position, the positioning screw 15 on the positioning block 13 can be rotated anticlockwise to release the locking state of the positioning block 13 on the scale 12, then the positioning block 13 is moved and the scale on the scale 12 is observed through the positioning groove 14 to measure the radius of the circle and calculate the circumference, when the circle needs to be drawn, after the position of the positioning block 13 is determined, the positioning screw rod 15 is rotated clockwise to fix the positioning block 13 on the scale 12, at this time, the compass tip 11 can be pushed against the paper, and the graph drawing is performed through the compass pen body 16 by rotating the measuring box shell 1.

After the student used circumference measuring device to measure the circumference and finishes, will measure 5 clockwise rotations of knob on the 1 outer wall of box shell, can drive driving gear 7 clockwise rotations through driving shaft 6 when 5 clockwise rotations of knob to through driven gear 9 drive driven screw 8 counter-clockwise rotations, driven screw 8 can drive slider 10 along measuring box shell 1 rebound this moment, after slider 10 removed to inside groove 2, can accomodate measuring box shell 1 to the schoolbag in.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a circumference measuring device is used to primary school's mathematics, includes and measures box shell (1), its characterized in that:

an inner groove (2) with a downward opening is formed in the measuring box shell (1), a sliding block (10) is movably arranged in the inner groove (2), a containing mechanism (17) is arranged in the measuring box shell (1), and the containing mechanism (17) is assembled to drive the sliding block (10) to move along the vertical direction of the measuring box shell (1);

the bottom of slider (10) is provided with scale (12), the activity is provided with locating piece (13) on scale (12), the inside of locating piece (13) is provided with positioning mechanism (18), positioning mechanism (18) are assembled and are worked as when locating piece (13) are followed scale (12) horizontal direction removes, make its locking in arbitrary position.

2. A circumference measuring device for primary school mathematics according to claim 1, wherein: the inner walls of two opposite sides of the measuring box shell (1) are provided with sliding grooves (3) communicated with the inner groove (2), the top of each sliding groove (3) is provided with an inner cavity (4) communicated with the sliding groove, one adjacent side of each inner cavity (4) is communicated with the adjacent side of the corresponding inner cavity, and the outer side of one inner cavity (4) is provided with a groove communicated with the outer wall of the measuring box shell (1).

3. A circumference measuring device for primary school mathematics according to claim 1, wherein: receiving mechanism (17) include knob (5), driving shaft (6) and driving gear (7), knob (5) set up in the recess of seting up on the outer wall of measurement box shell (1), the one end coupling of driving shaft (6) is in wherein on the inner wall of inner chamber (4) of relative recess, the other end of driving shaft (6) runs through two inner chambers (4) and fixed mounting in the inboard of knob (5), driving gear (7) respectively fixed mounting in driving shaft (6) are located on the outer wall in inner chamber (4).

4. A circumference measuring device for primary school mathematics according to claim 3, wherein: the receiving mechanism (17) further comprises a driven screw rod (8) and a driven gear (9), one end of the driven screw rod (8) is connected to the bottom side of the sliding groove (3) in a shaft mode, and the driven gear (9) is fixedly installed at the other end of the driven screw rod (8) and connected with the driving gear (7).

5. A circumference measuring device for primary school mathematics according to claim 1, wherein: positioning mechanism (18) are including positioning screw (15), locating piece (13) are adjacent constant head tank (14) have been seted up to one side of scale (12) graduation apparatus, positioning screw (15) activity set up in the top of locating piece (13).

6. A circumference measuring device for primary school mathematics according to claim 1, wherein: the compasses pen is characterized in that a compass tip (11) is arranged at the bottom of the sliding block (10), and a compass pen body (16) which is located on the same vertical plane with the compass tip (11) is arranged at the bottom of the positioning block (13).