CN205344248U - Simple and easy blackboard compasses drawing instrument - Google Patents

Abstract

The utility model relates to a simple and easy blackboard compasses drawing instrument, the drawing instrument includes corrugated metal pipe (1), the upper and lower both ends of corrugated metal pipe (1) are connected with connecting rod (2) and lower connecting rod (3) respectively, connecting rod (3) bottom is connected with sucking disc (4) down, the vertical grafting in top of going up connecting rod (2) has a pivot (5), vertical a seted up draw -in groove (5.1) in pivot (5) top, planted in draw -in groove (5.1) a pen -holder (6), the head cross -under of pen -holder (6) has a round pin axle (5.2), and should (5.2) the cross -under of round pin axle between two cell walls of draw -in groove (5.1), the chalk is installed to the afterbody of pen -holder (6). The utility model relates to a simple and easy blackboard compasses drawing instrument, simple and easy blackboard compasses drawing instrument convenient and reliable and that application scope is wide draws.

Description

Simple blackboard compasses painter's paraphernalia

Technical field

This utility model relates to a kind of Simple blackboard compasses painter's paraphernalia.

Background technology

At present, math teacher it is frequently necessary to picture circle when carrying out writing on the blackboard, and conventional drawing tool is an instrument being similar to compasses, it is necessary to utilizes positioning needle to prick and positions on blackboard, so easily blackboard is caused damage；Further, since positioning needle is rotating in drawing course, therefore it occurs the situation of mobile skew unavoidably, causes that the circle drawn is not up to standard, affects quality of instruction；And two stand bar structure of compasses structure are fixed form, it is impossible to regulate, so that compasses cannot draw the circle under minor diameter and two extreme situations of major diameter smoothly, thus affecting teaching effect.

Summary of the invention

The purpose of this utility model is in that to overcome above-mentioned deficiency, it is provided that a kind of Simple blackboard compasses painter's paraphernalia drawing convenient and reliable and applied widely.

The purpose of this utility model is achieved in that

A kind of Simple blackboard compasses painter's paraphernalia, described painter's paraphernalia includes metal bellows, the two ends up and down of described metal bellows are connected to upper connecting rod and lower connecting rod, being connected to sucker bottom described lower connecting rod, the top of described upper connecting rod is vertically plugged with a rotating shaft, and described rotating shaft top vertically offers a draw-in groove, a penholder it is plugged with in described draw-in groove, the head cross-under of described penholder has a bearing pin, and this bearing pin is connected between two cell walls of draw-in groove, and the afterbody of described penholder is provided with chalk.

This utility model one Simple blackboard compasses painter's paraphernalia, described penholder is intubated the draw and insert-type adjustment structure constituted by more piece.

This utility model one Simple blackboard compasses painter's paraphernalia, described lower connecting rod is set with tape measure.

Compared with prior art, the beneficial effects of the utility model are:

This utility model adopts sucker suction on blackboard, blackboard will not be caused any damage, and metal bellows, upper connecting rod and lower connecting rod that sucker connects do not rotate in drawing course, will not produce mobile after causing sucker suction, it is ensured that the precision of drawing；It addition, its length as a supporting leg of drawing instrument can be regulated easily by metal bellows；And the penholder being intubated the draw and insert-type adjustment structure constituted by more piece has length adjustment function equally, thus this utility model can draw the circle of various different-diameter, applied widely, unaffected；Meanwhile, by the introducing of tape measure, can the circle of accurate Drawing different-diameter, it is simple to student understands.

Accompanying drawing explanation

Fig. 1 is the structural representation of a kind of Simple blackboard compasses painter's paraphernalia of this utility model.

Fig. 2 is the side view of Fig. 1 of a kind of Simple blackboard compasses painter's paraphernalia of this utility model.

Wherein:

Metal bellows 1, upper connecting rod 2, lower connecting rod 3, sucker 4, rotating shaft 5, penholder 6, tape measure 7；

Draw-in groove 5.1, bearing pin 5.2.

Detailed description of the invention

Referring to Fig. 1 and Fig. 2, a kind of Simple blackboard compasses painter's paraphernalia that this utility model relates to, described painter's paraphernalia includes metal bellows 1, the two ends up and down of described metal bellows 1 are connected to upper connecting rod 2 and lower connecting rod 3, it is connected to sucker 4 bottom described lower connecting rod 3, the top of described upper connecting rod 2 is vertically plugged with a rotating shaft 5, described rotating shaft 5 top vertically offers a draw-in groove 5.1, a penholder 6 it is plugged with in described draw-in groove 5.1, the head cross-under of described penholder 6 has a bearing pin 5.2, and this bearing pin 5.2 is connected between two cell walls of draw-in groove 5.1, the afterbody of described penholder 6 is provided with chalk；

Preferably, described penholder 6 is intubated the draw and insert-type adjustment structure constituted by more piece, consequently facilitating the length of penholder 6 is adjusted；

Preferably, described lower connecting rod 3 is set with tape measure 7, when diameter of a circle is carried out accurate Drawing by needs, tape measure 7 can be passed through and measure；

Additionally: it should be noted that above-mentioned detailed description of the invention is only a prioritization scheme of this patent, any change that those skilled in the art does according to above-mentioned design or improvement, all within the protection domain of this patent.

Claims (3)

1. a Simple blackboard compasses painter's paraphernalia, it is characterized in that: described painter's paraphernalia includes metal bellows (1), the two ends up and down of described metal bellows (1) are connected to upper connecting rod (2) and lower connecting rod (3), described lower connecting rod (3) bottom is connected to sucker (4), the top of described upper connecting rod (2) is vertically plugged with a rotating shaft (5), described rotating shaft (5) top vertically offers a draw-in groove (5.1), a penholder (6) it is plugged with in described draw-in groove (5.1), the head cross-under of described penholder (6) has a bearing pin (5.2), and this bearing pin (5.2) is connected between two cell walls of draw-in groove (5.1), the afterbody of described penholder (6) is provided with chalk.

2. a kind of Simple blackboard compasses painter's paraphernalia as claimed in claim 1, it is characterised in that: described penholder (6) for be intubated the draw and insert-type adjustment structure constituted by more piece.

3. a kind of Simple blackboard compasses painter's paraphernalia as claimed in claim 1, it is characterised in that: described lower connecting rod (3) is set with tape measure (7).