CN2528638Y

CN2528638Y - Compasses

Info

Publication number: CN2528638Y
Application number: CN 02226565
Authority: CN
Inventors: 陈志豪; 冼卓伟
Original assignee: Individual
Current assignee: Individual
Priority date: 2002-04-02
Filing date: 2002-04-02
Publication date: 2003-01-01
Anticipated expiration: 2012-04-02

Abstract

The utility model relates to compasses, particularly to compasses for teaching. The utility model comprises a handle, a rotating seat, a base plate and a circle center pin that are all on the same central axis; wherein, the circle center pun can be withdrawn into the bottom of the base plate flexibly; the rotating seat is arranged on the base plate; the handle is arranged on the rotating seat through a device that can changes beeline movement to circle movement; the rotating seat is internally provided with a radial groove; the groove is internally fixed with a rail through an elastic device; and one end of the rail is provided with a pen clamping sleeve. When people use the compasses of the utility model for drawing circles, a qualified circle can be drawn on a blackboard or other planes by clamping a pen on the pen clamping cover, holding the handle of the compasses, making the circle center pin aiming at the appointed circle center and then pressing. The compasses of the utility model can automatically draw a circle by hand pressing with easy operation and the circle center is unlikely to have replacement; besides, various pens can be utilized and the applicable scope is wide.

Description

A kind of compasses

Technical field

The utility model relates to a kind of compasses, particularly a kind of compasses for teaching.

Background technology

In daily teaching and propaganda work, people often need make the picture circle on vertical planes such as blackboard, wall, glass, at this moment just need compasses.Compasses for teaching commonly used comprises Gauge for the centre of a circle pin and mapping rule pin, in use since the Gauge for the centre of a circle pin be that a face contacts as drawing, be shifted easily, so just must fix the Gauge for the centre of a circle pin with a hand, the another hand-screw transfers to figure and advises pin picture circle, when signing in a half, must open being used for fixing the openhanded of Gauge for the centre of a circle pin, after walking around mapping rule pin, retighten the Gauge for the centre of a circle pin again, continue to paint another semicircle.This compasses for teaching troublesome poeration, and efficient is lower, the displacement of Gauge for the centre of a circle pin takes place easily and change two distances of advising between pin, thus influence picture circle quality.This kind compasses can only use chalk, and other pen all can not use as pencil, ball pen, oil pen etc., has so just limited its usable range.

The utility model content

The purpose of this utility model is the shortcoming that overcomes above-mentioned compasses, provides a kind of simple in structure, and hand is from the compasses of animation circle.This compasses are easy and simple to handle, and available various types of stroke circles are particluarly suitable for using on the even surfaces such as blackboard, glass.

For achieving the above object, the technical scheme of a kind of compasses of the utility model is: it comprises handle, swivel base, and chassis and center of circle pin, they are on same central axis; But center of circle pin elastic income tray bottom, swivel base is installed in above the chassis, and handle is installed in above the swivel base by a mechanism that rectilinear motion can be transformed into circular motion; One radial slot is arranged in the swivel base, be fixed with a cross bar by take-up in the groove, cross bar one end has Casing with pen.

After adopting said structure, people need the picture bowlder, only need the pen cap on Casing with pen, hold handle then and center of circle pin is aimed at the selected center of circle, and toward next pressure, a satisfactory circle can draw on blackboard or other plane.Compasses hand of the present utility model can be round from animation, simple to operate; The center of circle is difficult for being shifted, and Casing with pen can put dissimilar pens, and the scope of application is wide.

Description of drawings

Fig. 1 is the structural representation of a kind of compasses of the utility model;

Fig. 2 is the front view on the chassis of a kind of compasses of the utility model;

Fig. 3 is the use synoptic diagram of a kind of compasses of the utility model;

Fig. 4 is the Casing with pen of a kind of compasses of the utility model and the partial enlarged drawing of cross bar connecting portion.

Embodiment

As shown in Figure 1, the structure of a kind of compasses of the utility model is as follows: it comprises handle 1, swivel base 3, and chassis 5 and center of circle pin 6, they are on same central axis; But 5 bottoms, center of circle pin 6 elastic income chassis; Swivel base 3 adopts bearing arrangement to be installed in above the chassis 5, makes swivel base 3 be easy to rotate; Handle 1 is installed in above the swivel base 3 by a mechanism that rectilinear motion can be transformed into circular motion, the structure of a kind of hand self-rotary screwdriver on the structure of the described mechanism that rectilinear motion can be transformed into circular motion and the current market is identical, handle 1 is driven swivel base 3 along pressure energy under the central axis make circular motion around central axis; One radial slot 31 is arranged in the swivel base 3, be fixed with a cross bar 4 by take-up 32 in the groove 31, cross bar 4 can radially slide in groove 31; Cross bar 4 one ends have a Casing with pen 7.As shown in Figure 2, described chassis 5 is a transparent body, and its periphery is provided with rubber ring 51.

People can be undertaken by shown in Figure 3 in use.Behind the selected center of circle and the definite radius, put pen for 7 li at Casing with pen, the distance that slip cross bar 4 is regulated nib and center of circle pin 6 is a radius, then by take-up 32 fixed transverse rods 4, again center of circle pin 6 is aimed to make behind the selected center of circle and made chassis 5 in the center of circle pin 6 retraction chassis 5 and make drawing and closely contact, then with handle 1 to next pressure, rectilinear motion can be transformed into the mechanism's drive swivel base 3 of circular motion and the rotation of cross bar 4 by described, can make the satisfactory circle that draws fast on the drawing.

In addition, as shown in Figure 4, Casing with pen 7 is installed in cross bar 4 one ends by torsion spring 71, is used as the bowlder nib and runs into thrust and can not finish work when justifying task, Casing with pen 7 just can reach and can cross the purpose that thrust can be finished work circle task again by the suitable angle of effect deflection of torsion spring 71.

The above-mentioned chassis 4 variable transparent bodies that are changed to, its bottom is provided with sucker, when shiny surface upper drawing circles such as Glass blackboard, with regard to the phenomenon of more difficult generation center of circle displacement.

Above-mentioned cross bar 4 can be made into the ruler of a band scale, just can adjust radius of a circle at any time, and the different circles that require that draw are as concentric circles.

Above-mentioned Casing with pen 7 can put dissimilar pens, as chalk, pencil, ball pen, pen, writing brush, oil pen etc., satisfies different mapping requirements.

Above-mentioned cross bar 4 can be fixed in the groove 31 of swivel base 3, and Casing with pen 7 movable being arranged on the cross bar 4, such change also can be adjusted radius of a circle at any time, can reach the result of use of the foregoing description equally.

Claims

1, a kind of compasses is characterized in that: it comprises handle (1), swivel base (3), and chassis (5) and center of circle pin (6), they are on same central axis; Center of circle pin (6) but elastic income chassis (5) bottom, swivel base (3) is installed in above the chassis (5), handle (1) is installed in above the swivel base (3) by a mechanism that rectilinear motion can be transformed into circular motion; One radial slot (31) is arranged in the swivel base (3), be fixed with a cross bar (4) by take-up (32) in the groove (31), cross bar (4) one ends have a Casing with pen (7).

2, a kind of compasses according to claim 1 is characterized in that: described swivel base (3) adopts bearing arrangement to be installed in above the chassis (5).

3, a kind of compasses according to claim 1 is characterized in that: described chassis (5) are a transparent body, and its periphery is provided with rubber ring (51).

4, a kind of compasses according to claim 1 is characterized in that: described chassis (5) are a transparent body, and its bottom is provided with sucker.

5, a kind of compasses according to claim 1 is characterized in that: described cross bar (4) is the ruler of a band scale.

6, a kind of compasses according to claim 1 is characterized in that: described Casing with pen (7) is installed in cross bar (4) one ends by torsion spring (71).

7, a kind of compasses according to claim 1 is characterized in that: described Casing with pen (7) is movably arranged on the cross bar (4).