CN102371823A

CN102371823A - Cursor-sucker teaching compasses

Info

Publication number: CN102371823A
Application number: CN2010102535084A
Authority: CN
Inventors: 陈沈洋
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-08-04
Filing date: 2010-08-04
Publication date: 2012-03-14

Abstract

The invention aims to provide cursor-sucker teaching compasses, which can be conveniently positioned and fixed on a blackboard made of hard materials, such as glass. The radius of a circle is drawn by utilizing a gear cursor to adjust a preset distance, thereby being accurate and being easy to operate. Besides, a cursor frame fixed arm and a cursor type moveable arm of the cursor-sucker teaching compasses are both graduated, and the cursor-sucker teaching compasses have a function of a ruler. The cursor-sucker teaching compasses have the advantages that a chalk can be used for drawing a circle on any hard and smooth surface, the radius of the drawn circle can be directly read from the graduations on the cursor type moveable arm, and the conception is novel, convenient and practical.

Description

Vernier sucker educational compasses

Affiliated technical field

The present invention relates to a kind of educational aid, be specially a kind of vernier sucker educational compasses.

Background technology

Existing educational compasses generally comprises two and can be each other movable decides bar and moving bar, but uses and inconvenient.The then bad operation of the sub-tension of two jibs is crossed pine and is then drawn the easy diameter that becomes in the round process.And it decides the pole pair blackboard generally is with the nail location, particularly modern new-type dais blackboard, as: after the blackboard of hard materials such as glass occurred, the conventional teaching compasses used just more difficult.

Summary of the invention

The purpose of this invention is to provide a kind of vernier sucker educational compasses; This vernier sucker educational compasses easily positioning and fixing on the blackboard of hard materials such as glass; And drawing radius of circle is to regulate setpoint distance through the gear vernier, accurate operation easily again.The present invention is achieved in that the cursor type swing arm 2 by the band tooth bar, rotary handle 3, band self-locking swing pinion 4; Movable chalk folder 5, the vernier frame of built-in slideway is decided arm 7, pin 8; Pull bar 9, transparent cross center graduation mark saddle 10, transparent elastic force sucker 12 grades are formed.During work by transparent cross center graduation mark saddle 10 find accurately the center of circle that will draw; Hold blackboard through transparent elastic force sucker 12 with vacuum mode; Relend and help rotary handle 3 rotating band self-locking swing pinions 4, control the accurate radius of gyration of the movable chalk folder 5 on far away, the nearly position of mounting hole, then at the uniform velocity around promoting cursor type swing arm 2; With transparent cross center graduation mark saddle 10 concentric pull bars 9 is the center, does accurate rotation and accomplishes the picture circle.Its special feature is: transparent elastic force sucker 12 is arranged at the bottom of transparent cross center graduation mark saddle 10, and the top of transparent cross center graduation mark saddle 10 has the vernier frame to decide arm 7, and the vernier frame decides to have in the slideway of arm 7 cursor type swing arm 2 and band self-locking swing pinion 4.In addition, the vernier frame of this vernier sucker educational compasses is decided arm 7 all has scale with cursor type swing arm 2, also has the function of scale ruler.Benefit of the present invention is can be round with drawing with coloured chalk on any hard smooth surface, and draws radius of circle and can from the scale of cursor type swing arm, directly read, and is novel, convenient and practical.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the present invention is further specified.

Accompanying drawing 1 is location status profile and the vertical view that the present invention draws the major diameter bowlder.

Accompanying drawing 2 is location status profiles that the present invention draws the minor diameter bowlder.

Accompanying drawing 3 is the present invention's location status profiles when not drawing work.

In the accompanying drawings: the 1st, installing hole far away is drawn the major diameter bowlder and is used; The 2nd, the cursor type swing arm, a side has scale, and opposite side has tooth bar; The 3rd, rotary handle; The 4th, band self-locking swing pinion; The 5th, movable chalk folder is furnished with the fixing usefulness of nut; The 6th, nearly installing hole is drawn the minor diameter bowlder and is used; The 7th, the vernier frame is decided arm, built-in slideway, and a side has scale and the cursor type swing arm 2 related radiuses of reading drawn circle; The 8th, pin supplies the vernier frame to decide 90 ° of rotations of arm and uses; The 9th, pull bar produces in order to spur transparent elastic force sucker that vacuum uses; The 10th, transparent cross center graduation mark saddle also has 360 evenly divideds, works to support the vernier frame and decides arm 7 and positioning tie bar 9; The 11st, the steam vent of transparent cross center graduation mark saddle 10; The 12nd, transparent elastic force sucker.

The specific embodiment

Estimation will be drawn round size dimension, movable chalk folder 5 is installed in advance among installing hole 1 far away or nearly installing hole 6.Transparent cross center graduation mark saddle 10 is aimed at the center of circle of wanting the picture circle; Reverse the vernier frame and decide 7 one-tenth 90 degree of arm; Since pin 9 and the distance of transparent cross center graduation mark saddle 10 work into 90 when spending than the duration of not working; Spur transparent elastic force sucker 12 away from blackboard, produce vacuum at once between then transparent elastic force sucker 12 and the blackboard.Gas between transparent elastic force sucker 12 and the transparent cross center graduation mark saddle 10 is drained from steam vent 11, makes transparent cross center graduation mark saddle 10 borrow transparent elastic force sucker 12 can hold the blackboard of hard materials such as glass tightly.Rotation adjusting rotary handle 3, the movable chalk that band self-locking swing pinion 4 is regulated on the cursor type swing arm 2 back and forth presss from both sides 5 to the requirement position, from the scale of cursor type swing arm 2, can directly read drawn radius of a circle.At the uniform velocity, borrowing pull bar 9 to do accurate rotation and accomplishing the picture circle around transparent cross center graduation mark saddle 10 central through holes around promoting cursor type swing arm 2.One step of the picture of so just will finding range circle accomplishes.

Want to draw again the concentric circles of a plurality of different radiis; Only need repeat rotation adjusting rotary handle 3 again; The movable chalk that band self-locking swing pinion 4 is regulated on the cursor type swing arm 2 back and forth presss from both sides 5 to the requirement position, from the scale of cursor type swing arm 2, can directly read drawn radius of a circle.

Claims

1. vernier sucker educational compasses, by cursor type swing arm (2), rotary handle (3); Band self-locking swing pinion (4), movable chalk folder (5), the vernier frame is decided arm (7); Pin (8), pull bar (9), transparent cross center graduation mark saddle (10); Transparent elastic force suckers (12) etc. are formed; It is characterized in that: transparent elastic force sucker (12) is arranged at the bottom of transparent cross center graduation mark saddle (10), and the top of transparent cross center graduation mark saddle (10) has the vernier frame to decide arm (7), and the vernier frame decides to have in the slideway of arm (7) cursor type swing arm (2) and band self-locking swing pinion (4).