CN202319546U

CN202319546U - Teaching compasses

Info

Publication number: CN202319546U
Application number: CN2011204718588U
Authority: CN
Inventors: 乔静
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-11-15
Filing date: 2011-11-15
Publication date: 2012-07-11
Anticipated expiration: 2021-11-15

Abstract

The utility model discloses teaching compasses. The tops of a fixed rod and a rotary rod are hinged to a fixing base by a pin shaft, a pen sleeve is arranged at the lower end of the rotary rod, the fixed rod is formed by connecting an upper fixed rod and a lower fixed rod in an inserting mode, a central hole is formed at the lower end of the upper fixed rod, and an annular groove is formed on the side wall of the central hole along the circumferential direction; and an annular chute fitted with the groove is formed on the outer wall of the lower fixed rod, which is close to the upper end, along the circumferential direction, the chute of the lower fixed rod is positioned in the groove of the upper fixed rod, and a suction disk is arranged at the bottom of the lower fixed rod. According to the teaching compasses, the conventional sharp end foot is replaced by the suction disk, so that holes or scratches on a blackboard are avoided, the service life of the blackboard is prolonged, a teacher uses and operates the teaching compasses conveniently, and the working difficulty of the teacher is reduced.

Description

Educational compasses

Technical field:

The utility model belongs to teaching aid, is specifically related to a kind of educational compasses.

Background technology:

Compasses are teaching aids that the mathematics teacher uses always, and existing compasses are many to be made up of fixed bar and swingle, and both tops are hinged; The bottom of fixed bar is provided with sharp-pointed end pin; In order to the fixing center of circle, sharp-pointed end pin makes blackboard eye and cut occur during use, influences the service life of blackboard.

Summary of the invention:

The purpose of the utility model provides a kind of educational compasses, its reasonable in design, and the novelty that is skillfully constructed, convenient to use, safe and reliable, avoid scratching blackboard.

The purpose of the utility model realizes as follows: this educational compasses comprises fixed bar, swingle and the pen cap; The top of fixed bar and swingle is articulated on the holder through bearing pin; The pen cap is located at the lower end of swingle; Fixed bar is pegged graft with following fixed bar by last fixed bar and is constituted, and the lower end of last fixed bar offers centre bore, along the circumferential direction is provided with the conduit of annular on the sidewall of centre bore; Following fixed bar is near along the circumferential direction being provided with the annular slide track that matches with conduit on the outer wall of upper end, the slideway of following fixed bar is in the conduit of fixed bar, and the bottom of following fixed bar is provided with sucker.

The utility model replaces original sharp-pointed end pin with sucker, avoids making blackboard eye to occur or causes cut, prolongs the service life of blackboard, also is convenient to the teacher simultaneously and uses operation, has reduced teacher's work difficulty.

Description of drawings:

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

Fig. 2 is the fixed bar partial structurtes figure of the utility model.

The specific embodiment:

With reference to Fig. 1, Fig. 2; This educational compasses comprises fixed bar 1, swingle 2 and the pen cap 9; Fixed bar 1 is articulated on the holder 7 through bearing pin 8 with the top of swingle 2, and the pen cap 9 is located at the lower end of swingle 2, and fixed bar 1 is pegged graft with following fixed bar 12 by last fixed bar 11 and constituted; The lower end of last fixed bar 11 offers centre bore 4, along the circumferential direction is provided with the conduit 5 of annular on the sidewall of centre bore 4; Following fixed bar 12 is near along the circumferential direction being provided with the annular slide track 6 that matches with conduit 5 on the outer wall of upper end, the slideway 6 of following fixed bar 12 is in the conduit 5 of fixed bar 11, and the bottom of following fixed bar 12 is provided with sucker 3.During use; Through sucker 3 fixed bar 1 is absorbed and fixed on the blackboard; Swingle 2 separately makes it get final product draw circles along fixed bar 1 rotation then, and the slideway 6 of going up conduit 5 and following fixed bar 12 upper ends of fixed bar 11 through its lower end in this process is realized the rotation of self; And then make fixed bar 11 along with swingle rotates, so that draw circles.

Claims

1. educational compasses; Comprise fixed bar (1), swingle (2) and the pen cap (9); Fixed bar (1) is articulated on the holder (7) through bearing pin (8) with the top of swingle (2), and the pen cap (9) is located at the lower end of swingle (2), it is characterized in that: fixed bar (1) is pegged graft by last fixed bar (11) and following fixed bar (12) and is constituted; The lower end of last fixed bar (11) offers centre bore (4), along the circumferential direction is provided with the conduit (5) of annular on the sidewall of centre bore (4); Following fixed bar (12) is near along the circumferential direction being provided with the annular slide track (6) that matches with conduit (5) on the outer wall of upper end, the slideway (6) of following fixed bar (12) is in the conduit (5) of fixed bar (11), and the bottom of following fixed bar (12) is provided with sucker (3).