CN201309340Y - Compasses with sucker - Google Patents

Abstract

The utility model belongs to a teaching appliance, in particular relates to compasses with sucker, comprising a main rod (7), accessory rods (3) and a pencil hoop (2), wherein the lower end of the main rod is provided with a universal joint (8) which is connected with a circular sucker (9). The compasses with sucker can be fixed on blackboards through the sucker without assistance of hand, and is convenient to draw circles.

Description

The compasses of band sucker

Technical field

The utility model belongs to realia, particularly a kind of compasses with sucker.

Background technology

At present, in middle school teaching, the teacher of last how much classes is with a great circle planning circle to use, because present blackboard adopts the glass face more, smooth surface is being drawn bowlder with compasses, have to one hand steered, the center of circle is difficult to fix.

Summary of the invention

The purpose of this utility model is to overcome above-mentioned technical deficiency, and the fixedly compasses of the band sucker in the center of circle of a kind of energy are provided.

The technical scheme that the utility model technical solution problem adopts is: a kind of mobile jib, secondary bar, pen hoop of comprising, be characterized in adorning a universal joint in the mobile jib lower end, and universal joint is fixedlyed connected with the dish type sucker.

The beneficial effects of the utility model are: these compasses are fixed with sucker and blackboard, need not be hand steered, and the convenient circle of drawing.

Description of drawings

Specify with embodiment below in conjunction with accompanying drawing.

Fig. 1 is the compasses front view of band sucker.

Among the figure, the 1-chalk; 2-pen hoop; The secondary bar of 3-; The 4-handle; The 5-bolt; The 6-wing nut; The 7-mobile jib; The 8-universal joint; The 9-sucker;

The specific embodiment

Embodiment, with reference to accompanying drawing, a kind of compasses with sucker comprise mobile jib 7, secondary bar 3, pen hoop 2, are characterized in adorning a universal joint 8 in the mobile jib lower end, universal joint 8 is fixedlyed connected with dish type sucker 9.Sucker 9 adopts the material of good springiness to make, and mobile jib 6 flexibly connects with bolt 5 with secondary bar 3 one ends, and bolt 5 is threaded with wing nut 6, after the angle between mobile jib 7 and the secondary bar 3 mixes up, tighten fixingly with wing nut 6, secondary bar 3 lower ends are provided with pen hoop 2, in the pen hoop 2 chalk 1 are housed; Mobile jib 7 upper ends are provided with handle 4, are convenient to the hand-held circle of drawing.

During use, earlier, transfer the angle between mobile jib 7 and the secondary bar 2, mix up the back and tighten fixingly with wing nut 6,, firmly click and can hold 4 strokes of circles of handle then with sucker 9 perpendicular alignmnet blackboard planes according to drawing round size, easy to use, effective.

Claims (1)

1, a kind of compasses with sucker comprise mobile jib (7), secondary bar (3), pen hoop (2), it is characterized in that adorning a universal joint (8) in the mobile jib lower end, and universal joint (8) is fixedlyed connected with dish type sucker (9).

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