CN202608352U

CN202608352U - Magnetic compasses

Info

Publication number: CN202608352U
Application number: CN 201120177801
Authority: CN
Inventors: 邹彩霞
Original assignee: ZOU YONGHE
Current assignee: ZOU YONGHE
Priority date: 2011-05-30
Filing date: 2011-05-30
Publication date: 2012-12-19
Anticipated expiration: 2021-05-30

Abstract

A magnetic compass is disclosed and the magnetic compass is characterized by simple structure, operation safety, convenience, low manufacture cost, and great practical applicability. The magnet compass is formed by connecting a large magnetic head, a small magnetic head and a straight ruler through a screw bolt, wherein the central part of the straight ruler is milled to form a rectangular shape while the two sides of the central part are zigzag-shaped, the central part can control the upward-and-downward sliding of a slide block, the straight ruler is provided with scales, the central part of the straight ruler is provided with a slide block having a spring, a thin aluminum sheet having a pen hole is sleeved with an end of the slide block, an empty cylinder for holding a chalk is bonded on the pen hole, and the size of the bottom face of the empty cylinder is the same as that of the pen hole. A nick is arranged at the middle of the edge of the pen hole, and the nick corresponds to the scales at the two sides of the straight ruler.

Description

The magnetic compasses

Affiliated technical field

The utlity model has the function of compasses, ruler, be specially adapted to teachers ' teaching and use.

Background technology

At present, the compasses that use in the teaching, no matter from profile, still from making things convenient for the use aspect all relatively backward, operation is very inconvenient, but also dangerous.

Summary of the invention: in order to overcome the defective of existing compasses in outward appearance and use; Also in order to adapt to the needs of modern teaching, the utility model provides a kind of magnetic compasses simultaneously, and these compasses can use on various blackboards; On magnet board, use more convenient; It can be drawn circle, picture arc on request, measure the length of object, and operation is very easy, and blackboard is not had any injury effect.

The utility model solves the technical scheme that its technical problem adopted: couple together size, different two circular magnetic heads and the rulers of thickness with screw; Little magnetic head is placed on the centre of big magnetic head; Size just is that two magnetic heads can fit together; And little magnetic head is thinner, with behind the upper cap nut with being of uniform thickness of big magnetic head.Magnetic head can be used as a pin of compasses, is fixed on the magnet board, and screw-socket is used as the center of circle, and an end of ruler is an arc; There is a screw-socket centre, begins to indicate scale from screw-socket, have on the ruler one have a spring slide block; Draw bowlder, slide block can be regulated the size of radius, and an end of slide block is with a thin type aluminium flake; There is a hole of a chalk head size centre of aluminium flake, is stained with a bottom surface and the identical hollow round column of its size on the hole, can adorn chalk and use.Draw the size that the bowlder slide block can be regulated radius, also there is an indentation centre at slide block edge, and when regulating radius, as long as let the indentation on the slide block overlap with a certain scale on the ruler, what circles the radius of oneself needs of just drawing are.

The beneficial effect of the utility model is: can change the existing operational inconvenience of compasses, and also safety, can directly draw circle as required, draw arc, can also measure the length of object, also can not damage magnet board simultaneously, be easy to carry.Through the utility model on probation in the teaching, from student to teacher, all give very high evaluation to this utility model, with in our teaching in the past the compasses of usefulness compare, the utility model is simple in structure, and is more convenient, safe, practical, and cheap.

Description of drawings:

Below in conjunction with accompanying drawing and embodiment the utility model is further specified.

Fig. 1: the overall structure figure that is the utility model

Fig. 2: the structure chart that is the utility model ruler

Fig. 3: first embodiment that is the utility model

Fig. 4: second embodiment that is the utility model

Fig. 5: the 3rd embodiment that is the utility model

Among Fig. 1: 1, little magnetic head; 2, big magnetic head; 3, screw; 4, screw-socket; 5, a hole; 6, scale; 7, sawtooth; 8, joint; 9, arc; 10, hollow; 11, slide block; 12, aluminium flake; 13, hollow round column; 14, ruler; 15, indentation.

The specific embodiment:

In Fig. 1, little magnetic head (1) is stuck in big magnetic head (2) lining, and there is a screw-socket (4) at the center of little magnetic head (1); One ruler (14) is arranged on the magnetic head, and it is arc (9) that ruler (14) leans on one of magnetic head, at the center of arc (9) aperture is arranged; Little magnetic head (1) and big magnetic head (2) and ruler (14) are exactly to couple together with a screw (3), and the center of ruler (14) is hollow (10) and the edge ruler core is sawtooth (7) shape, draw circle for ease on request; The both sides of ruler (14) indicate scale (6); Simultaneously this scale also can be measured the length of object, the hollow part of ruler (14) have one have a spring slide block (11), an end of slide block (11) is with the thin type aluminium flake in a band hole; And be stained with a hollow round column (13) on a hole (5), can adorn chalk and use.The other end of ruler (14) is into two right angles of 90 °, and can measure certain angle with it is the right angle, and an end of ruler has an indentation (15).So simple in structure, complete magnetic compasses have just been accomplished.

In the embodiment shown in fig. 3; The head portion of magnetic compasses is positioned on the magnet board; It and magnet board are because magnetic can be bonded on the blackboard firmly, and the length of the slide block (11) on the adjusting ruler (14) and the distance of little magnetic head (1) central small hole is placed on chalk in the hole (5) then; Along clockwise or be rotated counterclockwise 360 °, the circle what centimetres just can settle the radius that draws at one go be.

In the embodiment shown in fig. 4, measure certain angle is the right angle, only need see whether overlap fully, just can know whether this angle is the right angle that end at the ruler band right angle of magnetic compasses near this angle.

[0016] in the embodiment shown in fig. 5, this is the embodiment that measures the length of object, only need get final product the part of band scale on the magnetic compasses when ruler uses.

Claims

1. magnetic compasses; A circular magnetic head and a ruler couple together with screw, and it is characterized in that: this magnetic head is combined into by two different circular magnetic heads of big or small thickness, and little magnetic head is placed on the centre of big magnetic head; Size is that just two magnetic heads can fit together; And the thinner thickness of little magnetic head, behind upper cap nut, with being of uniform thickness of big magnetic head.

2. magnetic compasses according to claim 1 is characterized in that: an end of ruler is an arc, and the other end has two right angles, and the mid portion of ruler has been milled the sky rectangularity, and the edge indentation, and ruler is marked with scale.

3. magnetic compasses according to claim 1 is characterized in that: have on the ruler one have a spring slide block, an end of slide block is with a thin type aluminium flake, and a hole of chalk head size is arranged in the middle of the aluminium flake, other has a hollow round column and it to link together.