CN201211796Y

CN201211796Y - Teaching compasses

Info

Publication number: CN201211796Y
Application number: CNU2008200871248U
Authority: CN
Inventors: 叶青华
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-05-12
Filing date: 2008-05-12
Publication date: 2009-03-25
Anticipated expiration: 2018-05-12

Abstract

The utility model relates to a teaching compass which adopts a three-legged sucking disc for fixing and uses a cone-shaped bulge arranged at the center of the tree-legged sucking disc as a reference selecting circle center; the cone-shaped bulge structure can accurately align the circle center; and when the teaching compass is used for drawing a circle, the three-legged sucking disc is not easily deformed and flexed to change the semidiameter of the circle. The utility model has the advantages that the structure is reasonable and the use is convenient; the circle center is easily and accurately aligned; and because the volume of the three-legged sucking disc is small, when the teaching compass is used for drawing a circle, the three-legged sucking disk is not easily deformed and flexed to change the semidiameter of the circle.

Description

A kind of educational compasses

Technical field

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

Background technology

The pilot pin that tradition teaching aid compasses are provided with by its fixed arm lower end is located on the blackboard surface and is fixing, then rotate turning arm and draw circle, but, can't insert because of pilot pin and to be difficult to location, and easy damaged blackboard surface for case hardness big Glass blackboard or metal blackboard.In order to overcome this problem, people have proposed various new construction compasses, for example patent is called " compasses of band sucker " (patent No.: patent CN200620162118.5), it comprises fixed arm, turning arm, connecting axle, universal joint is equipped with in the lower end of fixed arm, and the universal joint other end is equipped with resilient suction cups.These compasses adopt sucker to replace pilot pin, can be fixed on hard blackboard surface conveniently and solidly, because sucker and fixed arm are asked universal joint are housed, and fixed arm can rotate easily, the circle of drawing or arc.The compasses that this utility model provides are simple in structure, use is also comparatively convenient.But have bigger defective: its sucker can provide the fixation of pilot pin, and the fixing point that is difficult to align more exactly is as round dot but its dish type is big, and the effect that can not provide the angle of pilot pin accurately to align round dot is provided; In addition, it adopts single sucker, and at the rotary picture bowlder, it is easy to, and stress deformation stretches and the change radius of a circle.

Summary of the invention

The utility model mainly is the difficult accurately alignment of a solution existing in prior technology round dot, technical problems such as change radius of a circle provide a kind of educational compasses to single sucker drawing easily deformable the stretching of bowlder.A kind of educational compasses of the utility model, it adopts the tripod sucker to fix, and serves as with reference to choosing round dot with the tapered protrusion of being located at tripod sucker center; The tapered protrusion structure round dot that can align exactly, the tripod sucker is in that to draw bowlder not yielding flexible and change radius of a circle; This rational in infrastructure, simple, easy to use.

Above-mentioned technical problem of the present utility model is mainly solved by following technical proposals: a kind of educational compasses of the utility model, it comprise can by the end be articulated and connected an opening and closing pivoted arm and draw arm, pivoted arm is connected with sucker by ball head universal, draw the clamping device that arm is provided with the clamping paintbrush, described sucker comprises the tripod suction cup carrier and is located at the circular magnetic chuck of its tripod end that tripod one side bottom of this suction cup carrier is provided with the taper positioning convex; Described ball head universal is to be made of the bulb of being located at the pivoted arm end and the adaptive with it turn trough of being located at the suction cup carrier head.Tapered protrusion is in the centre of tripod suction cup carrier, and its head is pointed, and the pointed head existing point on the blackboard that is easy to align makes compasses to choose the center of circle more exactly and justifies; The circular magnetic chuck of tripod sucker, the sucker body is fixed on the fixed head face to produce suction at the air of discharging under the pressure extrusion effect between itself and stationary plane, the mode of three-point fix is comparatively stable fixed form, draws bowlder tripod sucker at the picture arm and can provide stable location to pivoted arm; Each circular magnetic chuck volume of tripod sucker is less, is easy to discharge air and produces suction-operated, also is difficult for after the absorption being out of shape under the effect that the pivoted arm rotation produces, and therefore, can keep the uniformity of drawn radius of circle preferably.This structure is fixed by the tripod sucker after being easy to choose the center of circle by tapered protrusion again, selects round dot to be easy to alignment, and is rational in infrastructure, easy to use, be easy to make.It is to be noted: the utility model is the preferred technique scheme with the tripod sucker; the invention thinking is to utilize the multiway sucker to play stable fixation; so also can adopt multiway suckers such as bipod, four pin, five pin, it still belongs within the protection domain of the present utility model.

Clamping device is to be used for the rod paintbrush of clamping such as chalk, clamping is reliable, the replacing paintbrush is simple to operation in order to make, as preferably, described clamping device comprises and is sheathed on the holding frame on the picture arm and is located at spring between both corresponding sidewalls, draw the opposing sidewall of arm and spring and be provided with groove constituting gripping section, holding frame can be withheld paintbrush under the effect of spring in groove and the formation clamping.The cross section of groove can be V-type or U type or square or arc.

As preferably, the stage casing of described pivoted arm is arranged with can be along the rotating pivoted housing of pivoted arm.Drawing arm rotation picture bowlder, pivoted housing can relatively easily be that the user grips.

As preferably, described pivoted arm connecting portion is the disk of middle part transversal slotting, and disk is by this groove and the disk clamping of drawing arm; Pivoted arm is regulated locking and is unclamped by the locking nut of being located at roller end with the picture arm.This scheme is a pivoted arm connecting portion disk middle part transversal slotting, and as equivalent, vice versa, promptly draws arm connecting portion disk middle part transversal slotting, and in the pivoted arm connecting portion disk card entry slot.

As preferably, it is 90-100 ° deep-slotted chip breaker that described disk outer is provided with one section central angle, and the disk sidewall corresponding with deep-slotted chip breaker is provided with angle index.Angle index can be convenient to user's the aperture by central angle adjusting pivoted arm and picture arm.

As preferably, described pivoted arm and draw the arm material and be plastics.This structure, in light weight, be easy to carry about with one, handled easily.

As preferably, described circular magnetic chuck is transparent elastic material.Be convenient to see clearly the writing or the lines of its bottom fixed bit.

Therefore, the utlity model has characteristics such as rational in infrastructure, easy to use, especially having the round dot that is easy to accurately align, sucker volume, little to be not easy to distortion flexible and change beneficial effect such as radius of a circle drawing bowlder.

Description of drawings

Accompanying drawing 1 is a kind of structural representation of the present utility model;

Accompanying drawing 2 is A-A cutaway views of accompanying drawing 1;

Accompanying drawing 3 is B-B cutaway views of accompanying drawing 1;

Accompanying drawing 4 is C place enlarged drawings of accompanying drawing 1.

The specific embodiment

Below by embodiment, and in conjunction with the accompanying drawings, the technical solution of the utility model is described in further detail.

Embodiment: a kind of educational compasses of the utility model, shown in accompanying drawing 1, accompanying drawing 2, accompanying drawing 3, accompanying drawing 4, it comprise can by the end be articulated and connected an opening and closing pivoted arm 1 and draw arm 2, pivoted arm 1 is connected with sucker 3 by ball head universal 4, draw the clamping device 5 that arm 2 is provided with the clamping paintbrush, sucker 3 comprises tripod suction cup carrier 31 and is located at the circular magnetic chuck 32 of its tripod end that tripod one side bottom of this suction cup carrier 31 is provided with taper positioning convex 33.

The stage casing of pivoted arm 1 is arranged with can be along pivoted arm 1 rotating pivoted housing 11.Pivoted arm 1 connecting portion is the disk 12 of middle part transversal slotting, and disk 12 is by this groove and disk 22 clampings of drawing arm 2; Pivoted arm 1 is regulated locking and is unclamped by the locking nut 14 of being located at roller end with picture arm 2.It is 90 ° deep-slotted chip breaker 12 that disk 12 outers are provided with one section central angle, and disk 22 sidewalls corresponding with deep-slotted chip breaker 12 are provided with angle index.

Ball head universal 4 is to be made of the bulb 41 of being located at pivoted arm 1 end and the adaptive with it turn trough 42 of being located at suction cup carrier 31 heads.

Clamping device 5 comprises the holding frame 51 that is sheathed on the picture arm 2 and is located at spring 52 between both corresponding sidewalls, draw arm 2 and spring 52 opposing sidewalls and be provided with groove 21 constituting gripping section, holding frame 51 forms clamping paintbrush being withheld under the effect of spring 52 in groove 21.

Pivoted arm 1 and picture arm 2 materials are plastics.Circular magnetic chuck 32 is transparent elastic material.

Claims

1, a kind of educational compasses, comprise can by the end be articulated and connected an opening and closing pivoted arm (1) and draw arm (2), pivoted arm (1) is connected with sucker (3) by ball head universal (4), draw the clamping device (5) that arm (2) is provided with the clamping paintbrush, it is characterized in that: described sucker (3) comprises tripod suction cup carrier (31) and is located at the circular magnetic chuck (32) of its tripod end that tripod one side bottom of this suction cup carrier (31) is provided with taper positioning convex (33); Described ball head universal (4) is by being located at terminal bulb (41) of pivoted arm (1) and adaptive with it turn trough (42) formation of being located at suction cup carrier (31) head.

2, a kind of educational compasses according to claim 1, it is characterized in that: described clamping device (5) comprises the holding frame (51) that is sheathed on the picture arm (2) and is located at spring (52) between both corresponding sidewalls, draw the opposing sidewall of arm (2) and spring (52) and be provided with groove (21) constituting gripping section, holding frame (51) formation clamping paintbrush being withheld the effect of spring (52) under in groove (21).

3, a kind of educational compasses according to claim 1 is characterized in that: the stage casing of described pivoted arm (1) is arranged with can be along the rotating pivoted housing of pivoted arm (1) (11).

4, according to claim 1 or 2 or 3 described a kind of educational compasses, it is characterized in that: described pivoted arm (1) connecting portion is the disk (12) of middle part transversal slotting, and disk (12) is by this groove and disk (22) clamping of drawing arm (2); Pivoted arm (1) is regulated locking and is unclamped by the locking nut (14) of being located at roller end with picture arm (2).

5, a kind of educational compasses according to claim 4 is characterized in that: it is 90-100 ° deep-slotted chip breaker (12) that described disk (12) outer is provided with one section central angle, and disk (22) sidewall corresponding with deep-slotted chip breaker (12) is provided with angle index.

6, according to claim 1 or 2 or 3 described a kind of educational compasses, it is characterized in that: described pivoted arm (1) and picture arm (2) material are plastics.

7, according to claim 1 or 2 or 3 described a kind of educational compasses, it is characterized in that: described circular magnetic chuck (32) is transparent elastic material.