CN203004798U - Teaching aid-compass - Google Patents

Abstract

The utility model relates to a compass teaching aid used in the teaching of university mathematics teachers. The compass teaching aid comprises a compass arm with a scale, one end of the compass arm is sleeved in a rotating shaft, the bottom of the rotating shaft is located in a suction cup, a chute is arranged on the compass arm, and a movable pen holder is arranged on the chute. The compass teaching aid is very convenient for centering and drawing, and the circle diameter is easy to adjust.

Description

Compasses Teaching Aids

technical field

The utility model relates to a teaching aid used by university mathematics teachers, in particular to a compass teaching aid for teaching.

Background technique

At present, in the mathematics teaching of universities, it is often necessary to draw circles on the blackboard, and most teachers use compasses to draw. However, the compass currently used in the classroom consists of two feet, one with a pointed foot and the other corner holding chalk. Such compasses can be used on wooden blackboards. But when drawing a circle on a glass blackboard, the iron point cannot be fixed, that is, the center of the circle cannot be fixed; in addition, the handle of this herringbone compass is a little far away from the blackboard, so the radius of the circle cannot be accurately controlled; when it is necessary to draw a curve with variable diameter or a large When the diameter is round, it is very inconvenient.

Utility model content:

Aiming at the problems existing in the existing compass teaching aids, the utility model provides a compass teaching aid. The compass teaching aid is very convenient for centering and drawing, and the circle diameter is easy to adjust.

The technical scheme of the utility model is: a compasses teaching aid, comprising a compass arm with a scale, one end of the compasses arm is set in the rotating shaft, the bottom of the rotating shaft is located in the suction cup, a chute is provided on the compass arm, the chute Equipped with a mobile clip.

Preferably, the above-mentioned rotating shaft end located in the suction cup is fitted with a spring and connected to the back cap.

Preferably, the compass arm is a telescopic arm with adjustable length.

Preferably, the lower end of the movable pen clip is provided with an elastic opening.

Locking screws are arranged between the upper end of the above-mentioned rotating shaft and the compass arm and between the moving pen holder and the chute.

The beneficial effects of the utility model are: after adopting the above-mentioned technical scheme, when drawing a circle in class, the center of the circle can be fixed only by absorbing the suction cup on the blackboard; It is easy to carry. When using it, you can stretch the compass arm or move the pen clip according to the size of the radius. Especially when drawing a curve according to the radius of curvature, you can move the pen clip while turning the compass arm, which is convenient and accurate, thereby increasing the compass. Feature.

Description of drawings

Fig. 1 is the structural representation of the utility model.

In the figure 1-compass arm, 2-scale, 3-rotation shaft, 4-locking screw, 5-suction cup, 7-back cap, 8-spring, 9-chute, 10-moving clip.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is further described:

As shown in Figure 1, the compass teaching aid comprises a compass arm 1, a rotating shaft 3, a suction cup inner 5 and a pen clip 10, the compass arm 1 has a scale 2 for adjusting the radius value, and one end of the above-mentioned compass arm 1 Set in the rotating shaft 3, the bottom of the rotating shaft 3 is located in the sucker 5, the compass arm 1 is provided with a chute 9 in the length direction, and the chute 9 is equipped with a movable pen holder 10.

As a preference, the above-mentioned shaft end of the rotating shaft 3 in the suction cup 5 is covered with a spring 8 and fixed by the back cap 7. When the chalk is slightly worn when marking the line, the upper end of the rotating shaft can be lightly pressed to make the chalk end contact the blackboard to avoid stopping. Scribing and adjusting chalk wastes time.

The compass arm 1 is a telescopic arm with adjustable length. When not in use, the compass arm is stacked so that the whole can be shortened and is easy to carry. When in use, the compass arm 1 can be stretched or the pen holder 10 can be moved according to the radius, especially according to the curvature. When the radius is found to draw a curve, the pen holder 10 is moved while the compass arm 1 is turned, which is convenient and accurate, thereby increasing the functionality of the compass.

The lower end of the movable pen holder 10 is provided with an elastic opening, which is convenient for chalk to be held.

In addition, locking screws 4 are arranged between the upper end of the rotating shaft 3 and the compass arm 1 and between the moving pen holder 10 and the chute 9 for fixing the components after adjusting the radius.

The above are only the best embodiments of the present utility model, but the scope of protection is not limited thereto. Anyone skilled in the art, within the technical scope disclosed in the utility model, can easily think of changes or replacements within the scope of the utility model. within the scope of protection.

Claims (5)

1. compass teaching aid, comprise the compasses arm (1) with scale (2), it is characterized in that: described compasses arm (1) one end is sleeved in rotating shaft (3), rotating shaft (3) bottom is positioned at sucker (5), compasses arm (1) is provided with chute (9), and mobile pen clip (10) is housed on chute (9).

2. compass teaching aid according to claim 1, is characterized in that: above-mentioned rotating shaft (3) end pocketed springs (8) and the connection back of the body cap (7) that is positioned at sucker (5).

3. compass teaching aid according to claim 1, it is characterized in that: described compasses arm (1) is the telescopic arm of adjustable-length.

4. compass teaching aid according to claim 1 is characterized in that: described mobile pen clip (10) lower end is provided with elastic opening.

5. compass teaching aid according to claim 1, is characterized in that: all be equipped with lock-screw (4) between the upper end of above-mentioned rotating shaft (3) and compasses arm (1) and between mobile pen clip (10) and chute (9).

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