CN205661213U - Mathematics compasses chi of teaching usefulness - Google Patents

Abstract

The utility model relates to a mathematical compass ruler for teaching, which belongs to the field of teaching aids. The utility model relates to a mathematical compass ruler for teaching, which can draw a complete circle at one time and is convenient for teaching. Both sides of the front of the ruler body are engraved with scale lines, the middle part of the ruler body is provided with a long strip hole, the middle part of the lower side wall of the ruler body is fixedly connected with a positioning rod, and the transmission device is arranged on the strip. Shaped hole one, and the center of the transmission device is correspondingly arranged on the center line of the ruler body, the transmission device and the elongated hole one of the ruler body are connected by connecting rods, and the two ends of the transmission device are fixedly connected with the mobile pen cover one, so The two moving pen covers are all vertically arranged, and the distances between the two moving pen covers are equal to the center line of the ruler body. The utility model is provided with two moving pen caps at both ends of the positioning handle, which can ensure that a complete circle can be drawn at one time, and the transmission device can ensure that the two moving pen caps have the same moving distance, so that the teacher can be more accurate in the drawing process.

Description

A mathematical compass ruler for teaching

technical field

The utility model belongs to the field of teaching aids, in particular to a compass ruler.

Background technique

The compass ruler is an indispensable teaching aid for teachers in mathematics teaching. However, in the process of teachers using the compass ruler, one movement can only draw half a circle, and the whole circle cannot be drawn at one time. inconvenient.

Contents of the invention

In view of the above problems, the utility model provides a mathematical compass ruler for teaching, which can draw a complete circle at one time and is convenient for teaching.

The technical scheme adopted by the utility model is: a mathematical compass ruler for teaching, including a ruler body, the two sides of the front of the ruler body are engraved with scale lines, and the mathematical compass ruler for teaching also includes a transmission device, a positioning rod, a connecting rod and two moving pen covers; the middle part of the ruler body is provided with a strip-shaped hole one, and the middle part of the lower side wall of the ruler body is fixedly connected with a positioning rod; In the hole one, and the center of the transmission device is correspondingly arranged on the center line of the ruler body, the transmission device and the elongated hole one of the ruler body are connected by a connecting rod, and the two ends of the transmission device are fixedly connected with the mobile pen cover one, and the The two movable pen covers are vertically arranged, and the distances between the two movable pen covers are equal to the center line of the ruler body.

The beneficial effects of the utility model are:

The utility model is provided with two moving pen caps at both ends of the positioning handle, which can ensure that a complete circle can be drawn at one time, and the transmission device can ensure that the two moving pen caps have the same moving distance, so that the teacher can be more accurate in the drawing process.

Description of drawings

Fig. 1: Schematic diagram of the first embodiment of the utility model;

Figure 2: Schematic diagram of the second embodiment of the utility model;

Figure 3: Front view of the utility model fixed pulley;

Among them: 1- ruler body; 2- positioning rod; 3- transmission device; 3-1- threaded pipe sleeve; 3-2- threaded rod; 3-3- mobile pen holder 2; 3-4- fixed pulley; 3-5 -handle; 3-6-wire rope; 3-7-spring; 3-8-protrusion; 4-moving pen cover one; 5-connecting rod; 6-long strip hole one; 7-gasket.

detailed description

A kind of mathematical compass ruler for teaching, comprising a ruler body 1, the two sides of the front of the ruler body 1 are all engraved with scale lines, and the mathematical compass ruler for teaching also includes a transmission device 3, a positioning rod 2, a connection Rod 5 and two mobile pen holders 14; the middle part of the ruler body 1 is provided with a strip-shaped hole 16, the middle part of the lower side wall of the ruler body 1 is fixedly connected with a positioning rod 2, and the transmission device 3 is arranged on the strip In the shaped hole one 6, and the center of the transmission device 3 is correspondingly arranged on the center line of the ruler body 1, the transmission device 3 is connected with the elongated hole one 6 of the ruler body 1 through the connecting rod 5, and the two ends of the transmission device 3 are Fixedly connected with a mobile pen cover one 4, the two mobile pen cover one 4 are all vertically arranged, and the distance between the two mobile pen cover one 4 is equal to the center line of the ruler body 1 .

As shown in Figure 1, in embodiment one, the transmission device 3 includes a threaded pipe sleeve 3-1, two threaded rods 3-2 and two moving pen holders 2 3-3, and the threaded pipe sleeve 3-1 is arranged horizontally In the elongated hole 6 of the ruler body 1, the threaded pipe sleeve 3-1 is rotationally connected with the ruler body 1 through the connecting rod 5, the two ends of the threaded pipe sleeve 3-1 are provided with positive and negative threads, and the lower end of the threaded pipe sleeve 3-1 Along its length direction, there are two strip-shaped holes, one end of two threaded rods 3-2 is threadedly connected with the two ends of threaded pipe sleeve 3-1 respectively, and one end of two threaded rods 3-2 is fixedly connected with a vertically arranged mobile Pen cover two 3-3, the two moving pen cover two 3-3 all pass through the elongated hole two, the other ends of the two threaded rods 3-2 are fixedly connected with a vertically arranged mobile pen cover one 4 .

How to use: When the diameter of the circle to be drawn is greater than the length of the threaded pipe sleeve 3-1, put the paintbrush into the two moving pen sleeves 14, and rotate the threaded pipe sleeve 3-1 to make the two threaded rods 3-2 horizontal Move, adjust and move the pen cover 14 to the corresponding position, use the positioning rod 2 for center positioning, and rotate the ruler body 1;

When the diameter of the circle to be drawn is less than the length of the threaded pipe sleeve 3-1, the paintbrush is put into two moving pen sleeves 2 3-3, and the threaded pipe sleeve 3-1 is rotated to make the two threaded rods 3-2 move horizontally , adjust and move the pen cover 2 3-3 to the corresponding position, use the positioning rod 2 for center positioning, and rotate the ruler body 1

As shown in Fig. 2 and Fig. 3, in embodiment two, the transmission device 3 includes a fixed pulley 3-4, a handle 3-5, two wire ropes 3-6 and two springs 3-7, and the fixed pulley 3 -4 is arranged in the elongated hole 6 of the ruler body 1, the fixed pulley 3-4 is connected with the ruler body 1 through the connecting rod 5 in rotation, and the outer peripheral surface of the fixed pulley 3-4 is provided with two annular grooves, the two One end of one of the wire ropes 3-6 of the wire ropes 3-6 is forwardly wound in one of the annular grooves, and one end of the other wire rope 3-6 of the two wire ropes 3-6 is reversely wound in the In another annular groove, the other ends of the two wire ropes 3-6 are fixedly connected with a vertically arranged mobile pen cover-4, the two mobile pen covers-4 and the two sides of the elongated hole-6 of the ruler body 1. Springs 3-7 are connected between the ends, the front of the ruler body 1 is provided with a circular pit, one end of the handle 3-5 is detachably connected to the axle of the fixed pulley 3-4, and the other end of the handle 3-5 Protrusions 3-8 are provided, and the protrusions 3-8 are set in cooperation with the circular pits.

How to use: Turn the handle 3-5 to drive the fixed pulley 3-4 to rotate, and drive the mobile pen cover 14 to move to the corresponding position through the two cords 3-6 wound forward and reverse, and then raise the handle 3-5 Put 3-8 in the circular pit, use the positioning rod 2 to locate the center, and rotate the ruler body 1 to get final product.

The lower end of the positioning rod 2 is provided with a gasket 7 . Its function is: to prevent scratching the blackboard and so on.

Claims (4)

1. A mathematical compass ruler for teaching, comprising a ruler body (1), both sides of the front of the ruler body (1) are engraved with graduation marks, it is characterized in that: the mathematical compass ruler for teaching, also It includes a transmission device (3), a positioning rod (2), a connecting rod (5) and two moving pen covers one (4); the middle part of the ruler body (1) is provided with a strip-shaped hole one (6), and the ruler The middle part of the lower side wall of the body (1) is fixedly connected with a positioning rod (2), the transmission device (3) is arranged in the elongated hole one (6), and the center of the transmission device (3) is correspondingly arranged on the ruler body ( 1) On the center line, the transmission device (3) is connected with the elongated hole one (6) of the ruler body (1) through the connecting rod (5), and the two ends of the transmission device (3) are fixedly connected with the mobile pen holder one (4), the two moving pen sets one (4) are vertically arranged, and the distance between the two moving pen sets one (4) relative to the center line of the ruler body (1) is equal. 2. A mathematical compass ruler for teaching according to claim 1, characterized in that: the transmission device (3) includes a threaded sleeve (3-1), two threaded rods (3-2) and two Two mobile pen covers (3-3), the threaded pipe cover (3-1) is horizontally arranged in the elongated hole (6) of the ruler body (1), the threaded pipe cover (3-1) and the ruler body ( 1) Rotate and connect through the connecting rod (5), the two ends of the threaded sleeve (3-1) are provided with positive and negative threads, and the lower end of the threaded sleeve (3-1) is provided with two long holes along its length direction. One end of the threaded rod (3-2) is threadedly connected with both ends of the threaded pipe sleeve (3-1) respectively, and one end of the two threaded rods (3-2) is fixedly connected with a vertically arranged mobile pen holder 2 (3-3), The two moving pen covers two (3-3) both pass through the elongated hole two, and the other ends of the two threaded rods (3-2) are fixedly connected with the vertically arranged mobile pen cover one (4) . 3. A mathematical compass ruler for teaching according to claim 1, characterized in that: the transmission device (3) includes a fixed pulley (3-4), a handle (3-5), two wire ropes ( 3-6) and two springs (3-7), the fixed pulley (3-4) is arranged in the elongated hole (6) of the ruler body (1), the fixed pulley (3-4) and the ruler body (1) Connected through the rotation of the connecting rod (5), two annular grooves are provided on the outer peripheral surface of the fixed pulley (3-4), and one of the two wire ropes (3-6) (3-6) 6) One end of the two wires (3-6) is wound forward in one of the annular grooves, and one end of the other wire (3-6) of the two wires (3-6) is wound in the other ring groove in reverse, and the two wires (3-6) The other ends of the cords (3-6) are fixedly connected with a vertically arranged mobile pen case one (4), and the two mobile pen case one (4) are connected with the elongated hole one (6) of the ruler body (1). A spring (3-7) is connected between the two ends, a circular pit is provided on the front of the ruler body (1), and one end of the handle (3-5) can be connected to the axle of the fixed pulley (3-4). The connection is disassembled, and the other end of the handle (3-5) is provided with a protrusion (3-8), and the protrusion (3-8) is set in cooperation with the circular pit. 4. A mathematical compass ruler for teaching according to claim 1, 2 or 3, characterized in that a gasket (7) is provided at the lower end of the positioning rod (2).