CN211441736U

CN211441736U - Mathematics plotter

Info

Publication number: CN211441736U
Application number: CN202020079754.1U
Authority: CN
Inventors: 王开帅
Original assignee: Jiangsu Food and Pharmaceutical Science College
Current assignee: Jiangsu Food and Pharmaceutical Science College
Priority date: 2020-01-15
Filing date: 2020-01-15
Publication date: 2020-09-08
Anticipated expiration: 2030-01-15

Abstract

The utility model provides a mathematical plotter, which comprises a ruler body, wherein a bar-shaped hollow cavity and an arc-shaped hollow cavity are arranged inside the ruler body, a rack is arranged in the bar-shaped hollow cavity, a gear is arranged in the arc-shaped hollow cavity in a rotating way, and the gear is meshed with the rack; one end of the rack is fixedly connected with a positioning ring, a chalk sleeve is matched in the positioning ring, a groove for limiting the movement of the chalk sleeve along the length direction of the ruler body is formed in the ruler body, a rotating shaft is arranged on the gear, and a knob is arranged at the top of the rotating shaft; the ruler comprises a ruler body and is characterized in that a through hole is further formed in one end of the ruler body, and a positioning portion capable of rotating relative to the ruler body is matched in the through hole. Through the structural improvement on the ruler body, the functions of compasses and a ruler are integrated, and the distance between the chalk sleeve and the positioning part can be changed by using a rack and gear meshing mode, so that the radius is adjusted.

Description

Mathematics plotter

Technical Field

The utility model relates to a mathematics teaching instrument field, in particular to mathematics plotter.

Background

Compasses and rulers are often used for drawing in mathematical education, long history exists in drawing by using the compasses and the rulers, the problems of different and various plane geometry drawing can be solved by using common rulers, the existing drawing tool has single function, the drawing tools are various and complicated, the tool is inconvenient to carry, and when a circle or an arc is drawn, the radius is not accurately positioned.

SUMMERY OF THE UTILITY MODEL

Technical problem to be solved

The to-be-solved technical problem of the utility model is to provide a mathematics plotter, portable, convenient to use, the function of set compasses and ruler through adjusting, can be accurate change circular or curved radius size.

(II) technical scheme

In order to solve the problems, the utility model provides a mathematical plotter, which comprises a ruler body and is characterized in that a bar-shaped hollow cavity and an arc-shaped hollow cavity are arranged inside the ruler body, a rack is arranged in the bar-shaped hollow cavity, a gear is rotationally arranged in the arc-shaped hollow cavity, and the gear is meshed with the rack; one end of the rack is fixedly connected with a positioning ring, a chalk sleeve is matched in the positioning ring, a groove for limiting the rack to move along the length direction of the ruler body is formed in the ruler body, a rotating shaft is arranged on the gear, and a knob is arranged at the top of the rotating shaft; the ruler comprises a ruler body and is characterized in that a through hole is further formed in one end of the ruler body, and a positioning portion capable of rotating relative to the ruler body is matched in the through hole.

Furthermore, the upper side of the chalk sleeve is provided with a pointer and a corresponding scale bar is carved on the ruler body.

Furthermore, the side surface of the rotating shaft is provided with a pointer and corresponding arc scales are carved on the ruler body.

Further, the top of the positioning part is in a suction disc shape.

Further, the chalk sleeve is detachable.

Further, the chalk sleeve and the positioning ring are connected through threads.

(III) advantageous effects

Compared with the prior art, the utility model, following beneficial effect has:

the utility model provides a mathematics plotter through the institutional advancement on the chi body, has set the function of compasses and ruler, uses rack, gear engagement, can change the distance between chalk sleeve pipe and the location portion to adjust the radius size.

Drawings

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

Fig. 1 is a top view of a mathematical plotter of the present invention;

fig. 2 is a perspective view of a mathematical plotter according to the present invention;

fig. 3 is a cross-sectional view of a cross-section a of a mathematical plotter of the present invention;

fig. 4 is a first embodiment of a mathematical plotter according to the present invention;

FIG. 5 is a second embodiment of a mathematical plotter of the present invention;

1-ruler body; 2-groove; 3-strip-shaped hollow cavities; 4-arc hollow cavity; 5-a rack; 6-a positioning part; 7-chalk sleeve; 8-gear; 9-a rotating shaft; 10-knob; 11-a positioning ring; 12-through holes.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The improved mathematical plotter of the present invention is shown in fig. 1-3 of the present specification. The utility model comprises a ruler body 1, which is different from the prior art that a bar-shaped hollow cavity 3 and an arc-shaped hollow cavity 4 are arranged in the ruler body 1, a rack 5 is arranged in the bar-shaped hollow cavity 3, a gear 8 is rotationally arranged in the arc-shaped hollow cavity 4, and the gear 8 is meshed with the rack 5; one end of the rack 5 is fixedly connected with a positioning ring 11, a chalk sleeve 7 is matched in the positioning ring 11, and chalk can be replaced and installed on the chalk sleeve 7 according to requirements, so that blackboard writing is facilitated. As shown in fig. 3, which is a cross-sectional view of a section a, a groove 2 for limiting the movement of the rack 5 along the length direction of the ruler body 1 is formed in the ruler body 1, so that the degree of freedom of the chalk sleeve 7 in the vertical direction is limited, the width of the groove 2 is smaller than that of the strip-shaped hollow cavity 3, a rotating shaft 9 is arranged on the gear 8, a knob 10 is arranged at the top of the rotating shaft 9, the knob 10 is adjusted, and the gear 8 rotates along with the rotating shaft to drive the rack 5 to transmit. The ruler comprises a ruler body 1 and is characterized in that a through hole 12 is further formed in one end of the ruler body 1, a positioning portion 6 capable of rotating relative to the ruler body 1 is matched in the through hole 12, preferably, the positioning portion 11 is in a shape of an absorbing plate at the top and can be absorbed on the surface of a blackboard, the distance between a chalk sleeve 7 and the positioning portion 6 can be changed through the matching of a gear 8 and a rack 5, and therefore the radius is changed.

In order to more intuitively see the distance between the chalk sleeve 7 and the positioning part 6 and determine the radius, the inventor proposes the following two embodiments:

fig. 4 shows a first embodiment of the improved mathematical plotter of the present invention, wherein the upper side of the chalk sleeve 7 is provided with a pointer and a corresponding scale bar is marked on the side pointed by the pointer.

Fig. 5 shows a second embodiment of the improved mathematical plotter of the present invention, wherein the side of the rotating shaft 9 is provided with a pointer and the ruler body 1 is engraved with corresponding arc scales.

Furthermore, the chalk sleeve 7 can be detachably connected to the positioning ring 11 by means of a screw connection. The chalk sleeve 7 and the positioning part 6 can be taken down when no circle needs to be drawn, so that the convex part does not influence the use.

In the using process, the positioning part 6 is positioned on the surface of the blackboard, the knob 10 is adjusted, the pointer is observed at the position indicated by the dial, chalk is installed in the chalk sleeve 7, the chalk sleeve 7 is dragged, and a required circular arc line is drawn.

The above-described embodiments are merely illustrative of the preferred embodiments of the present invention and are not intended to limit the spirit and scope of the present invention. Without departing from the design concept of the present invention, various modifications and improvements made by the technical solution of the present invention by those skilled in the art should fall into the protection scope of the present invention, and the technical contents claimed by the present invention have been fully recorded in the claims.

Claims

1. The mathematics plotter comprises a ruler body (1) and is characterized in that a bar-shaped hollow cavity (3) and an arc-shaped hollow cavity (4) are formed in the ruler body (1), a rack (5) is arranged in the bar-shaped hollow cavity (3), a gear (8) is arranged in the arc-shaped hollow cavity (4) in a rotating mode, the gear (8) is meshed with the rack (5), one end of the rack (5) is fixedly connected with a positioning ring (11), a chalk sleeve (7) is matched in the positioning ring (11), a groove (2) for limiting the rack (5) to move along the length direction of the ruler body (1) is formed in the ruler body (1), a rotating shaft (9) is arranged on the gear (8), and a knob (10) is arranged at the top of the rotating shaft (9); the ruler is characterized in that one end of the ruler body (1) is further provided with a through hole (12), and a positioning part (6) capable of rotating relative to the ruler body (1) is matched in the through hole (12).

2. A mathematical plotter as claimed in claim 1, characterized in that: the upper side of the chalk sleeve (7) is provided with a pointer and a corresponding scale bar is carved on the ruler body (1).

3. A mathematical plotter as claimed in claim 1, characterized in that: the side surface of the rotating shaft (9) is provided with a pointer and corresponding arc scales are carved on the ruler body (1).

4. A mathematical plotter as claimed in claim 1, 2 or 3, characterized in that: the top of the positioning part (6) is in a sucking disc shape.

5. A mathematical plotter as claimed in claim 1, 2 or 3, characterized in that: the chalk sleeve (7) is detachable.

6. A mathematical plotter according to claim 5, characterized in that: the chalk sleeve (7) is connected with the positioning ring (11) through threads.