CN2035713U

CN2035713U - Compass for blackboard drawing

Info

Publication number: CN2035713U
Application number: CN 88213356
Authority: CN
Inventors: 曹爱军
Original assignee: Individual
Current assignee: Individual
Priority date: 1988-09-10
Filing date: 1988-09-10
Publication date: 1989-04-12

Abstract

The utility model relates to a novel teaching compass which is formed by improving six positions on the basis of an old type compass. The novel teaching compass is characterized in that a universal transparent suction cup replaces a traditional nail head. The novel teaching compass is suitable for drawing circle arcs on a glass blackboard, is multipurpose, and has convenient use.

Description

Compass for blackboard drawing

A kind of improvement of garden of the present invention rule genus educational aid is novel.

Blackboard for education originally is many to be manufactured by plank or cement, the garden rule that adapt with it, and its stiff end is a pointed end, can choose at random suitable position and be fixed the garden of doing of rotating on blackboard panel.And the glass-board surface of new development is crisp because of quality, the plate face is hard and smooth smooth, and sharp-pointed garden, top is advised inapplicable.Though sucked type garden rule occurred already, but sucker black non transparent rubber is often made, the operator is difficult for the heart position, garden in definite drawn garden, imparts knowledge to students for convenient in addition, and teacher wishes to collect ruler, protractor, garden rule function in the invention appearance of the new-type garden of thing rule.

Multifucntional blackboard of the present invention garden rule can be on Glass blackboard, and arbitrarily definite garden heart is done the garden, and has ruler and protractor function simultaneously.Overcome the deficiency of old-fashioned garden rule, made things convenient for use.

The structure of Multifucntional glass of the present invention garden rule is as shown in drawings:

This garden rule are combined and are formed the main structure body that advise in the garden with running through screw rod (2) by movable leg (4) and Convenient table (3), handle (1) three parts that can arbitrarily rotate.

Convenient table (3) one sides are carved with scale and can be used as ruler, the opposite side of Convenient table also is carved with the scale of certain rule, can with movable leg (4) on be carved with identical rule scale match, if at Convenient table (3), movable leg (4) outside setting-out the angle of giving the phase number of degrees of can drawing come.

For compasses are drawn in, the rectangle dead slot of accommodating movable leg (4) is left in Convenient table (3) inboard.

Convenient table (3) top plant one has universal shaft, the rule sucker top, garden that can arbitrarily rotate, this top is made by transparent panel (10), soft rubber skin (11), is fixed on the universal spindle nose (9), and rule sucker top, this garden can be absorbed and fixed on the glass-board surface easily.Can under the handle mating reaction of freely revolving axle, make the garden rule movable leg that has chalk folder (8) decide garden heart rotation around giving easily.This " universal small sucker " replaced nail head in the past, solved the sliding partially problem of garden rule.

The time spent is not placed in the rectangle dead slot of Convenient table (3) garden rule movable leg (4).Movable leg also has chute on (4), slide bar (7) can arbitrarily stretch in chute to adapt to the big garden of picture or to draw long arc, the iron sheet chalk folder (8) of the new transformation of the way in slide bar (7) top of movable leg (4) can solve the shortcoming that chalk is easily broken, change the chalk trouble.

For making garden rule rotation convenient, garden rule spy of the present invention is provided with handle (1) as shown in drawings, is to add a sleeve pipe at the top of old-fashioned garden rule, needs only the sleeve pipe of holding with a firm grip on the other hand, proficiency rotation garden rule during use just passable, overcome that to draw the garden movement range big in the past, the shortcoming that chalk is easily broken.

Claims

1, a kind of teaching is advised with the new type blackboard garden, the upper end that it is characterized in that garden rule movable leg (4) and Convenient table (3) is connected by the bolt-through of the handle that is easy to rotate (1), corresponding scale (5), (6) are carved with on the relevant position in two leg medial and lateral, Convenient table (3) down top is provided with the transparent sucker that is combined by transparent panel (10) and soft rubber (11) of band universal shaft (9), and movable leg (4) is made up of inserted link (7) and slot.Inserted link can be free to slide in slot, and the inserted link top is provided with iron chalk folder (8).

2, require 1 described new type blackboard garden rule as claim, it is characterized in that the Convenient table top forms transparent sucker by universal shaft (9), transparent panel (10) and soft rubber skin (11).

3, require 1 described new type blackboard garden rule as claim, it is characterized in that being carved with the ruler scale outside the Convenient table (3).

4, require 1 described new type blackboard garden rule as claim, it is characterized in that the garden advises the scale that two inboard legs are carved with the respective corners number of degrees respectively.

5, require 1 described new type blackboard garden rule as claim, it is characterized in that movable leg (4) on can the drawn garden of conversion radius cutting can in slot, slide, its chalk of transplanting a cutting the top presss from both sides (8) to be made by iron sheet.