CN215096651U

CN215096651U - Multifunctional ellipse teaching aid

Info

Publication number: CN215096651U
Application number: CN202120721833.2U
Authority: CN
Inventors: 胡嘉伦
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-04-09
Filing date: 2021-04-09
Publication date: 2021-12-10
Anticipated expiration: 2031-04-09

Abstract

The utility model relates to a multi-functional oval teaching aid, it is including the main scale that has the scale, fix the stiff end at the main scale head and slide the end of moving on the main scale, at stiff end below fixedly connected with left casing, end below fixedly connected with right casing moves about, be equipped with left pilot pin in the bottom of left casing, be equipped with right pilot pin in the bottom of right casing, left pilot pin corresponds the originated scale on the main scale, right side location is to the scale that should move about and hold the correspondence, be equipped with receipts rope device in the left casing, receive and release the rope device and go up and be connected with two piece at least soft ropes that lie in the upper and lower interval parallel on the coplanar, soft rope passes and corresponds to be connected on the right casing behind the pen-holder through-hole of drawing pen and makes drawing pen freely slide on soft rope, the nib and the left pilot pin and the right pilot pin of drawing pen are in the coplanar. Therefore, the multifunctional teaching aid is convenient to use, simple in structure, accurate in ellipse drawing and capable of measuring.

Description

Multifunctional ellipse teaching aid

Technical Field

The utility model relates to the technical field of mathematics and measuring instruments, in particular to a multifunctional ellipse teaching aid capable of accurately drawing an ellipse and having a measuring function.

Background

The drawing of the ellipse in high school mathematics comprises a plurality of steps, after the length of a long broken shaft is known, drawing needs to be carried out for a plurality of times through a ruler and a compass to determine the circle center, so that the standard ellipse can be drawn, and the conventional teaching aid cannot be directly and accurately used for drawing the ellipse at one time; moreover, the existing teaching aid has a single function, generally only has the function of drawing a single figure, and is weak in universality; therefore, how to design a brand-new teaching aid and accurately form and draw a standard ellipse at one time by using the mathematical characteristics of the ellipse and the multifunctional teaching aid with the universal measurement function becomes a technical problem to be solved.

Disclosure of Invention

The utility model aims at providing a multifunctional ellipse teaching aid which can accurately draw an ellipse and has a measuring function aiming at the defects of the situations.

In order to achieve the purpose, the novel technical scheme is as follows: the utility model provides a multi-functional oval teaching aid, including the main scale that has the scale, fix the stiff end at the main scale head and slide the end of moving on the main scale, at stiff end below fixedly connected with left casing, at the end below fixedly connected with right casing that moves about, be equipped with left pilot pin in the bottom of left casing, be equipped with right pilot pin in the bottom of right casing, left pilot pin corresponds the originated scale on the main scale, right side location is to the scale that should move about and hold the correspondence, be equipped with receipts rope device in the left casing, receive and be connected with two piece at least soft ropes that the upper and lower interval is parallel that lie in the coplanar on the rope device, soft rope corresponds after passing the pen-holder through-hole of drawing pen and connects on the right casing and makes the drawing pen freely slide on soft rope, the nib and the left pilot pin and the right pilot pin of drawing pen are in the coplanar.

The rope winding and unwinding device comprises: the rotary shaft is vertically arranged in the left shell, the upper end of the rotary shaft is sleeved in the upper bearing fixed on the top surface of the left shell, and the lower end of the rotary shaft is sleeved in the lower bearing fixed on the bottom surface of the left shell; the horizontal bevel gear is sleeved on the rotating shaft and is linked with the rotating shaft, the lateral bevel gear is meshed and linked with the horizontal bevel gear, the outer end of the gear knob is exposed at the outer side of the left shell, and the inner end of the gear knob is inserted into a central hole of the lateral bevel gear and is linked; the left end of the soft rope is wound on the rotating shaft and the right end of the soft rope is led out of the left shell.

The rope winding and unwinding device further comprises: the brake knob comprises a brake knob and an internal thread sleeve, the internal thread sleeve is fixed on the lateral inner wall of the left shell, the external knob end of the brake knob is exposed out of the left shell, an internal screw of the brake knob is in threaded connection with the internal thread sleeve, and after assembly, the end part of the internal screw of the brake knob corresponds to the rod body of the rotating shaft so as to realize thread extrusion braking.

The top of the movable end is provided with a positioning screw, and the positioning screw enables the movable end and the main scale to realize thread positioning.

The bottom plate of the left shell is a movable insertion plate, and the lower bearing, the rotating shaft, the horizontal bevel gear and the movable insertion plate are mounted together to form a detachable assembly at the bottom of the left shell.

The right end of the soft rope is connected with an elastic rubber ball, and after assembly, the elastic rubber ball penetrates through the through hole in the side wall of the right shell and then is clamped on the inner wall of the right shell.

And a special winding groove part is concavely arranged on the shaft body of the rotating shaft.

And a friction grain area convenient for braking is arranged on the shaft body of the rotating shaft corresponding to the braking knob.

After the structure is adopted, the novel drawing pen and the penetrating structure of the soft rope determine the semi-circumference of the ellipse by accurately paying off the length of the soft rope, and then determine the long axis by the accurate length between the left positioning needle and the right positioning needle, so that the ellipse with the required size is drawn by sliding the drawing pen on the soft rope at one time, and the drawing pen is of a detachable structure and can be used as a measuring teaching aid after being detached, thereby having multiple functions; therefore, the multifunctional teaching aid is convenient to use, simple in structure, accurate in ellipse drawing and capable of measuring.

Drawings

FIG. 1 is a schematic view of an assembly structure of the present novel embodiment;

FIG. 2 is a schematic structural view of a rope retracting device according to the present invention;

fig. 3 is a schematic structural diagram of a ranging function according to the present invention.

Detailed Description

The following description of the present invention will be made in further detail with reference to the accompanying fig. 1-3.

As shown in fig. 1-3, the multifunctional ellipse teaching aid comprises a main scale 10 with scales, a fixed end 20 fixed on the head of the main scale 10, and a movable end 30 slidably disposed on the main scale 10, a left casing 21 is fixedly connected below the fixed end 20, a right casing 31 is fixedly connected below the movable end 30, a left positioning pin 22 is disposed at the bottom of the left casing 21, a right positioning pin 32 is disposed at the bottom of the right casing 30, the left positioning pin 22 corresponds to the initial scale on the main scale 10, the right positioning pin 32 corresponds to the scale corresponding to the movable end 30, a rope retracting device 40 is disposed in the left casing 21, the rope retracting device 40 is connected with at least two flexible ropes 50 which are parallel to each other at intervals on the same plane, the flexible ropes 50 are correspondingly connected to the right casing 31 after passing through the pen holder through holes of the drawing pen 60, so that the drawing pen 60 can freely slide on the flexible ropes 50, the tip 61 of the drawing pen 60 is located on the same plane as the left stylus 22 and the right stylus 32.

The rope retracting device 40 comprises: the device comprises a rotating shaft 41, an upper bearing 42, a lower bearing 43, a horizontal bevel gear 44, a lateral bevel gear 45 and a gear knob 46, wherein the rotating shaft 41 is vertically installed in the left shell 21, the upper end rotating shaft of the rotating shaft 41 is sleeved in the upper bearing 42 fixed on the top surface of the left shell 21, and the lower end rotating shaft of the rotating shaft 41 is sleeved in the lower bearing 43 fixed on the bottom surface of the left shell 21; the horizontal bevel gear 44 is sleeved on the rotating shaft 41 and is linked with the rotating shaft 41, the lateral bevel gear 45 is meshed and linked with the horizontal bevel gear 44, the outer end of the gear knob 46 is exposed at the outer side of the left shell 21, and the inner end of the gear knob 46 is inserted in the central hole of the lateral bevel gear 45 and is linked; the left end of the flexible rope 50 is wound on the rotating shaft 41 and the right end of the flexible rope 50 is led out of the left shell 21.

The rope retracting device 40 further comprises: the brake knob 47 and the internal thread sleeve 48, the internal thread sleeve 48 is fixed on the lateral inner wall of the left shell 21, the external knob end of the brake knob 47 is exposed outside the left shell 21, the internal screw thread of the brake knob 47 is connected in the internal thread sleeve 48, and after assembly, the end part of the internal screw of the brake knob 47 corresponds to the shaft body of the rotating shaft 41 to realize thread extrusion braking.

The top of the movable end 30 is provided with a set screw 33, and the set screw 33 enables the movable end to be in threaded positioning with the main scale 10.

The bottom plate of the left shell 21 is a movable plug board 211, and the lower bearing 43, the rotating shaft 41, the horizontal bevel gear 44 and the movable plug board 211 are installed together to form a detachable assembly at the bottom of the left shell 21.

The right end of the soft rope 50 is connected with an elastic rubber ball 51, and after assembly, the elastic rubber ball 51 penetrates through the through hole on the side wall of the right shell 31 and then is clamped on the inner wall of the right shell 31.

A special winding groove portion 411 is concavely arranged on the shaft body of the rotating shaft 41.

The shaft body of the rotating shaft 41 corresponding to the braking knob 47 is provided with a friction grain area 412 for facilitating braking.

When drawing an ellipse, the method comprises the following steps:

the first step is as follows: calculating the ellipse perimeter by an ellipse perimeter formula according to the sizes of the long axis and the short axis of the ellipse;

the second step is that: sliding the movable end 30 rightwards on the main ruler 10, and driving the lateral conical gear 46, the horizontal conical gear 44 and the rotating shaft 41 to be linked through twisting the gear knob 45, so that the flexible rope 50 is paid off until the movable end 30 reaches the scale of the half ellipse perimeter size, and the paying off length is synchronously set to the half ellipse perimeter size;

the third step: the braking knob 47 is twisted so that the braking knob 47 is pressed against the shaft body of the rotating shaft 41 to realize thread extrusion braking;

the fourth step: sliding the free end 30 to the left on the main scale so that the precise length between the left locator pin 22 and the right locator pin 32 is twice the dimension of the major axis of the ellipse;

the fifth step: after the left positioning pin 22 and the right positioning pin 32 are positioned on the drawing sheet, the drawing pen 60 slides on the flexible rope 50 to draw an ellipse with a required size at one time.

As shown in fig. 3, when a distance measurement is needed, the elastic rubber ball 51 on the flexible rope 50 is taken out from the right housing 31, and the distance measurement can be performed through the movable end 30 and the fixed end 20 after the drawing pen 60 is removed.

The bottom plate of this left casing 21 in novel is movable plugboard 211, lower bearing 43, pivot 41, horizontal bevel gear 44 and movable plugboard 211 install together and can dismantle the subassembly for left casing bottom, be convenient for like this installation and dismantlement maintenance.

Therefore, the multifunctional teaching aid is convenient to use, simple in structure, accurate in ellipse drawing and capable of measuring.

Naturally, the present invention can be embodied in many other forms without departing from the spirit or essential attributes thereof, and it should be understood that various changes and modifications can be made by one skilled in the art without departing from the spirit or essential attributes thereof, and it is intended that all such changes and modifications be considered as within the scope of the appended claims.

Claims

1. The utility model provides a multi-functional oval teaching aid, including the main scale that has the scale, fix the stiff end at the main scale head and slide the trip of establishing on the main scale and move the end, its characterized in that: the drawing pen comprises a fixed end, a movable end, a left shell, a right shell, a left positioning needle, a right positioning needle, a starting scale, a winding and unwinding device, at least two flexible ropes, wherein the flexible ropes are parallel to each other at an upper interval and a lower interval and are connected to the winding and unwinding device, the flexible ropes are correspondingly connected to the right shell after penetrating through a pen holder through hole of the drawing pen, the drawing pen can freely slide on the flexible ropes, and a pen point of the drawing pen, the left positioning needle and the right positioning needle are located on the same plane.

2. The multifunctional ellipse teaching aid of claim 1, wherein: the rope winding and unwinding device comprises: the rotary shaft is vertically arranged in the left shell, the upper end of the rotary shaft is sleeved in the upper bearing fixed on the top surface of the left shell, and the lower end of the rotary shaft is sleeved in the lower bearing fixed on the bottom surface of the left shell; the horizontal bevel gear is sleeved on the rotating shaft and is linked with the rotating shaft, the lateral bevel gear is meshed and linked with the horizontal bevel gear, the outer end of the gear knob is exposed at the outer side of the left shell, and the inner end of the gear knob is inserted into a central hole of the lateral bevel gear and is linked; the left end of the soft rope is wound on the rotating shaft and the right end of the soft rope is led out of the left shell.

3. A multi-functional ellipse teaching aid of claim 2, wherein: the rope winding and unwinding device further comprises: the brake knob comprises a brake knob and an internal thread sleeve, the internal thread sleeve is fixed on the lateral inner wall of the left shell, the external knob end of the brake knob is exposed out of the left shell, an internal screw of the brake knob is in threaded connection with the internal thread sleeve, and after assembly, the end part of the internal screw of the brake knob corresponds to the rod body of the rotating shaft so as to realize thread extrusion braking.

4. A multi-functional ellipse teaching aid of claim 3, which is characterized in that: the top of the movable end is provided with a positioning screw, and the positioning screw enables the movable end and the main scale to realize thread positioning.

5. The multifunctional ellipse teaching aid of claim 4, wherein: the bottom plate of the left shell is a movable insertion plate, and the lower bearing, the rotating shaft, the horizontal bevel gear and the movable insertion plate are mounted together to form a detachable assembly at the bottom of the left shell.

6. The multifunctional ellipse teaching aid of claim 5, wherein: the right end of the soft rope is connected with an elastic rubber ball, and after assembly, the elastic rubber ball penetrates through the through hole in the side wall of the right shell and then is clamped on the inner wall of the right shell.

7. The multifunctional ellipse teaching aid of claim 6, wherein: and a special winding groove part is concavely arranged on the shaft body of the rotating shaft.

8. The multifunctional ellipse teaching aid of claim 7, wherein: and a friction grain area convenient for braking is arranged on the shaft body of the rotating shaft corresponding to the braking knob.