CN2449937Y

CN2449937Y - Teaching compasses

Info

Publication number: CN2449937Y
Application number: CN 00261191
Authority: CN
Inventors: 刘洁; 李贞竹; 贾兰轩; 李琳; 尹永泉
Original assignee: 刘洁
Priority date: 2000-11-02
Filing date: 2000-11-02
Publication date: 2001-09-26
Anticipated expiration: 2010-11-02

Abstract

The utility model discloses a pair of teaching compasses, which comprises support legs below an intersection point, wherein, the end of the support leg used for determining the center of a circle is connected with a sucking disc by a sucking disc sleeve, and the lower half part of the support leg is provided with a rotation fixed point of a moving rod. The lower half part of the other support leg which can be provided with a drawing pen at the end is also provided with a fixed pivot, and the position of the fixed pivot is just the position that a scale 1 of the other end of the moving rod is fixed to the fixed pivot. A right-angled triangle taking the fixed pivot as a right angle is formed by enclosing the two support legs and the moving rod, and scales are also carved on the two support legs. The center of a circle is easily determined on a blackboard by the teaching compasses, the circle is conveniently drawn, and the utility model can also be used as a set square or a straightedge.

Description

A kind of educational compasses

The utility model relates to a kind of teaching appliance, particularly a kind of compasses of the picture usefulness of imparting knowledge to students.

Existing compasses are two supporting legs, paintbrush is installed in the end of one of them supporting leg, the end of another supporting leg is a pointed draw point, be mainly used to the picture circle, this compasses are drawn circle on paper better, if but just not handy at the blackboard upper drawing circle in the teaching, its reason is that the pointed draw point on the supporting leg skids on blackboard easily, the center of circle is bad to be determined, and the purposes of this compasses is also more single.

The purpose of this utility model is exactly the problem that exists in teaching at existing compasses, and design is a kind of non-slip at the blackboard upper drawing circle, determines the center of circle and the more compasses of purposes easily.

The purpose of this utility model is to realize like this, this educational compasses comprises two supporting legs under the intersection point, one of them supporting leg is used for determining the center of circle, another supporting leg is used for installing paintbrush, describedly be used for determining that the end of the supporting leg in the center of circle is connecting a sucker by the sucker cover, Lower Half at this supporting leg is provided with motion bar rotation fixing point, fixing one on this fixing point, can to put with this be the motion bar that has scale that rotate in the axle center, the described Lower Half that another can install the supporting leg of paintbrush in the end also is provided with a fixed pivot, when the other end scale 1 place that motion bar just is being easy to act as in the position of this fulcrum is fixed on this fulcrum, it is the right angled triangle at right angle with this fulcrum that two supporting legs and motion bar surround one, also is carved with scale on two supporting legs.

Because employing said structure, this educational compasses not only are easy to determine the center of circle on blackboard, draw circle easily, but also can make set square or ruler usefulness.

Describe embodiment of the present utility model in detail below in conjunction with accompanying drawing

Fig. 1 is the schematic diagram of educational compasses

Among the figure: 1, intersection point 2, determine center of circle supporting leg 3, paintbrush supporting leg

4, motion bar 5, shaft of a writing brush cover 6, sucker cover 7, sucker 8, motion bar rotation fixing point 9, fixed pivot

Intersection point has two supporting legs for 1 time, the end of determining the supporting leg 2 in the center of circle is connecting a sucker 7 by sucker cover 6, Lower Half at supporting leg is provided with motion bar rotation fixing point 8, fixing one on this fixing point, can to put with this be the motion bar that has scale 4 that rotate in the axle center, also be provided with a fixed pivot 9 in another Lower Half that paintbrush supporting leg 3 of paintbrush can be installed in the end, on two supporting legs, also be carved with scale.When being used as the compasses use, motion bar 4 can be rotated up, supporting leg last and definite center of circle overlaps.When being used as the right angle triangle use, motion bar 4 is pulled down, away from the supporting leg 2 of determining the center of circle, when the end scale 1 of moving motion bar 4 downwards to just in time was on the fixed pivot 9 of paintbrush supporting leg 3, it was the right angled triangle at right angle with this fulcrum that two supporting legs and motion bar surround one.

Claims

1, a kind of educational compasses, this educational compasses comprises two supporting legs under the intersection point, one of them supporting leg is used for determining the center of circle, another supporting leg is used for installing paintbrush, it is characterized in that describedly being used for determining that the end of the supporting leg in the center of circle is connecting a sucker by the sucker cover, Lower Half at this supporting leg is provided with motion bar rotation fixing point, fixing one on this fixing point, can to put with this be the motion bar that has scale that rotate in the axle center, the described Lower Half that another can install the supporting leg of paintbrush in the end also is provided with a fixed pivot, when the other end scale 1 place that motion bar just is being easy to act as in the position of this fulcrum is fixed on this fulcrum, it is the right angled triangle at right angle with this fulcrum that two supporting legs and motion bar surround one, also is carved with scale on two supporting legs.