CN201089305Y

CN201089305Y - Teaching calipers

Info

Publication number: CN201089305Y
Application number: CNU2007200263816U
Authority: CN
Inventors: 王绍卓
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-08-24
Filing date: 2007-08-24
Publication date: 2008-07-23
Anticipated expiration: 2017-08-24

Abstract

The utility model provides teaching compasses, comprising a positioning arm, a rotating arm, a positioning needle and a chalk jacket assembly. The utility model is characterized in that: the upper ends of the positioning arm and the rotating arm are connected through a screw; a butterfly bolt is arranged on the screw; the lower end of the positioning arm is provided with the positioning needle; the needlepoint of the positioning needle is provided with an antiskid rubber head; the lower end of the rotating arm is provided with the chalk jacket assembly; the chalk jacket assembly comprises a fastening sleeve pipe and a chalk clamping pipe; the fastening sleeve pipe and the chalk clamping pipe are in threaded connection; one end of the chalk clamping pipe is provided with two chalk clamping sheets; the inner surface of each chalk clamping sheet is provided with an antiskid gasket. When the teaching compasses are in use, the positioning needle is difficult to deviate; chalks are convenient to replace, good in fixation effect and difficult to break away or break off. The utility model is convenient to use and has very good popularizing and use value.

Description

Educational compasses

1, technical field

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

2, background technology

The educational compasses that common teacher uses, pilot pin is the peg of usefulness, chalk is that the clip of usefulness is fixing.Such compasses are in the process of using, and peg has to draw to blackboard and decreases, and when locate in the center of circle, the tip of peg friction on blackboard is easy to slide for a short time, cause departing from of the picture bowlder center of circle to cause the circular curve can not closure; This chalk clamping is decided the mode of chalk, though the clamping of chalk and change all is easy to, is drawing bowlder, often makes chalk disengaging clip because of overexerting even fractures.These factors all can be brought unusual inconvenience to teachers ' teaching, thereby influence quality of instruction.

3, summary of the invention

The purpose of this utility model is to overcome above-mentioned defective and deficiency, and a kind of educational compasses is provided.

The technical solution of the utility model realizes in the following manner, this educational compasses, comprise registration arm, cursor, pilot pin, chalk chuck assembly, the upper end that it is characterized in that registration arm and cursor is connected with screw, screw is provided with butterfly bolt, the registration arm lower end is provided with pilot pin, pilot pin pin end is provided with the anti-slip rubber head, the cursor lower end is provided with chalk chuck assembly, chalk chuck assembly comprises fastening sleeve pipe and chalk clamp, with being threaded, chalk clamp one end is offered two chalk intermediate plates between fastening sleeve pipe and the chalk clamp, and chalk intermediate plate inner surface is provided with Improved mat.

The utility model has the advantages that: the pilot pin of educational compasses is provided with the anti-slip rubber head, draws the bowlder pilot pin and is difficult for skew; Chalk is placed in the chalk clamp, selects suitable chalk protruded length, screw again fastening sleeve pipe make the chalk clamp tightly clamp chalk, the chalk good fixing effect is difficult for breaking away from and fractureing like this.

4, description of drawings

Accompanying drawing 1 is the structural representation of this educational compasses;

Accompanying drawing 2 is chalk chuck assembly structure schematic diagrames of this educational compasses;

Mark in the accompanying drawing is represented respectively;

Registration arm 1, cursor 2, pilot pin 3, chalk chuck assembly 4, screw 5, butterfly bolt 6, anti-slip rubber head 7, chalk 8, fastening sleeve pipe 9, chalk clamp 10, chalk intermediate plate 11, Improved mat 12.

5, the specific embodiment

Do following detailed description the in detail below in conjunction with 1,2 pairs of educational compasses of the present utility model of accompanying drawing.

As accompanying drawing 1, shown in 2, educational compasses of the present utility model, comprise registration arm 1, cursor 2, pilot pin 3, chalk chuck assembly 4, the upper end that it is characterized in that registration arm 1 and cursor 2 is connected with screw 5, screw 5 is provided with butterfly bolt 6, the registration arm lower end is provided with pilot pin 3, pilot pin 3 pin ends are provided with anti-slip rubber head 7, cursor 2 lower ends are provided with chalk chuck assembly 4, chalk chuck assembly 4 comprises fastening sleeve pipe 9 and chalk clamp 10, with being threaded, chalk clamp 10 1 ends are offered two chalk intermediate plates 11 between fastening sleeve pipe 9 and the chalk clamp 10, and chalk intermediate plate 11 inner surfaces are provided with Improved mat 12.

The tip of the pilot pin 3 of this educational compasses is provided with anti-slip rubber head 7, draws the bowlder pilot pin and is difficult for skew; In use, thin end with chalk extend in the chalk clamp earlier, the chalk butt end exposes, selection regulates suitable chalk protruded length, screw fastening sleeve pipe 9 again, along with the propelling of screw thread, two chalk intermediate plates 11 that make chalk clamp 10 tightly clamp chalk, the Improved mat 12 of chalk intermediate plate inner surface can prevent that chalk is subjected to external force to rotate or pass in and out, and also plays the effect of stressed buffering inside.

This educational compasses is reasonable in design, and is simple in structure, easy to use, and drawing bowlder has very comfortable feel, and the good fixing effect of chalk, changes easily, is difficult for during use breaking away from and fractureing, thereby has good value for applications.

Claims

1. educational compasses, comprise registration arm, cursor, pilot pin, chalk chuck assembly, the upper end that it is characterized in that registration arm and cursor is connected with screw, screw is provided with butterfly bolt, the registration arm lower end is provided with pilot pin, pilot pin pin end is provided with the anti-slip rubber head, the cursor lower end is provided with chalk chuck assembly, chalk chuck assembly comprises fastening sleeve pipe and chalk clamp, between fastening sleeve pipe and the chalk clamp with being threaded, chalk clamp one end is offered two chalk intermediate plates, and chalk intermediate plate inner surface is provided with Improved mat.