CN202428930U

CN202428930U - Compasses teaching aid

Info

Publication number: CN202428930U
Application number: CN2012200299062U
Authority: CN
Inventors: 石晓天
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-01-31
Filing date: 2012-01-31
Publication date: 2012-09-12
Anticipated expiration: 2022-01-31

Abstract

The utility model relates to a compasses teaching aid and belongs to teaching tools. The compasses teaching aid structurally comprises a handle, a support leg and a long rod, the lower end of the handle is connected to the upper end of the support leg, the lower end of the support leg is connected with a steel needle, one side of the support leg is perpendicularly connected to one end of the long rod, scale marks are disposed at the upper lateral edge of the long rod, a lateral groove and a bottom groove are respectively arranged along the axial direction of the long rod, a limiting screw is slidably connected into the lateral groove, the upper end of a chalk fixing sleeve is fixed to the lower end of the limiting screw, the lower end of the chalk fixing sleeve penetrates through the bottom groove, and a fastening screw is disposed on one side of the chalk fixing sleeve. The distance from the handle of the compasses teaching aid to the tip of the steel needle is quite short, the compasses teaching aid can be conveniently fixed onto a blackboard and cannot slide easily, when needing to draw a circle with standard size, a teacher can adjust a chalk according to a scale on the long rod to draw the circle without measuring by the aid of a ruler in advance, and the compasses teaching aid is operated more conveniently.

Description

A kind of teaching aid compasses

Technical field

The utility model relates to a kind of educational aid, specifically a kind of teaching aid compasses.

Background technology

When last mathematics class; Teacher will use the teaching aid compasses to draw circle, and two supporting legs of traditional teaching special compasses are very long, is a teacher with compasses when the blackboard upper drawing circle; Because the handle of compasses and blackboard are apart from too far away; And blackboard is the plane of erectting, and always on blackboard, slides as the needle point of fulcrum, uses very inconvenient.

The utility model content

The purpose of the utility model is to provide a kind of teaching aid compasses, and these compasses are easy to be fixed on the blackboard, is difficult for sliding, and can make teacher easily at the blackboard upper drawing circle.

The technical scheme that its technical problem of the utility model solution is taked is: a kind of teaching aid compasses, and its structure comprises handle, supporting leg and stock, described handle lower end connects the supporting leg upper end; The supporting leg lower end connects draw point; Described supporting leg one side vertically connects stock one end, and described stock upper side edge is provided with graduation mark, is respectively equipped with lateral groove and bottom surface groove along the stock axis direction; One limited screw is slidingly connected in the lateral groove; The lower end of limited screw is fixed in chalk fixed cover upper end, and the bottom surface groove is passed in the lower end, and described chalk fixed cover one side is provided with holding screw.

The beneficial effect of the utility model is: the handle of these teaching aid compasses is very short apart from the needle point distance of draw point, and is convenient fixing on blackboard, is difficult for sliding; Need the standard-sized bowlder of picture; Teacher can come picture according to the adjustment of the scale on stock chalk, need not to measure with ruler earlier to draw more convenient operation again.

Description of drawings

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

Among the figure: 1 handle, 2 supporting legs, 3 draw points, 4 limited screws, 5 chalk fixed covers, 6 bottom surface grooves, 7 lateral grooves, 8 stocks, 9 holding screws.

The specific embodiment

As shown in Figure 1.A kind of teaching aid compasses, its structure comprise handle 1, supporting leg 2 and stock 8, and described handle 1 lower end connects supporting leg 2 upper ends; Supporting leg 2 lower ends connect draw point 3; Described supporting leg 2 one sides vertically connect stock 8 one ends, and described stock 8 upper side edges are provided with graduation mark, are respectively equipped with lateral groove 7 and bottom surface groove 6 along stock 8 axis directions; One limited screw 4 is slidingly connected in the lateral groove 7; The lower end of limited screw 4 is fixed in chalk fixed cover 5 upper ends, and bottom surface groove 6 is passed in the lower end, and described chalk fixed cover 5 one sides are provided with holding screw 9.

When using these teaching aid compasses; Confirm earlier the distance of 2 of good chalk fixed covers 5 and supporting legs, hold handle 1, the needle point of draw point 3 is fixed on the blackboard through adjustment limited screw 4; Rotating handles 1 is drawn circle; Draw standard-sized bowlder if desired, teacher can come picture according to the adjustment of the scale on the stock 8 chalk, and is easy to operate.

Claims

1. teaching aid compasses comprise handle, supporting leg and stock, it is characterized in that; Described handle lower end connects the supporting leg upper end, and the supporting leg lower end connects draw point, and described supporting leg one side vertically connects stock one end; Described stock upper side edge is provided with graduation mark, is respectively equipped with lateral groove and bottom surface groove along the stock axis direction, and a limited screw is slidingly connected in the lateral groove; The lower end of limited screw is fixed in chalk fixed cover upper end, and the bottom surface groove is passed in the lower end, and described chalk fixed cover one side is provided with holding screw.