CN86207966U

CN86207966U - Beam compasses centring with suction cup

Info

Publication number: CN86207966U
Application number: CN 86207966
Authority: CN
Inventors: 唐映晖
Original assignee: Individual
Current assignee: Individual
Priority date: 1986-10-18
Filing date: 1986-10-18
Publication date: 1987-08-12

Abstract

The utility model relates to an improved compass which uses a sucking disc to replace an iron needle to determine the center of a circle. The improved compass is especially suitable for teaching and drawing to use. The lower bottom of the sucking disc is a concave cover. When the improved compass is used, the sucking disc is pushed and pressed, and the concave cover forms vacuum. Therefore, the sucking disc is firmly sucked on a plate surface stably. The upper part of the sucking disc is in a spherical hinge structure which can make the centering rod of the compass flexibly rotate. Meanwhile, the centering is firm and accurate.

Description

Beam compasses centring with suction cup

The utility model is a kind of improved sucker centring type compasses, particularly is suitable for the compasses of drawing and imparting knowledge to students and using.

Before the utility model is made, intersected the compasses that are movably connected to form by what people extensively adopted by centering bar and scribing rod for a long time, iron pin of the terminal equipment of its centering bar is as a center of circle of drawing circle.But the plate face quality of working as the circumference of drawing is hard, for example during material such as Glass blackboard, owing to can't hammering into the hardboard face, the iron pin skids, make that location, the center of circle is inaccurate, cause the very big difficulty of mapping, even can't carry out, both made the plate face quality of working as stroke circumference softer, again can be owing to the broken residual center of circle of plate face of iron acupuncture pin hole, it is clean and tidy to influence drawing.Therefore, how to make that the centering iron pin of this ancient drawing instrument of compasses is non-slip on the plate face, should improve innovation.

The purpose of this utility model is a kind of structural technological improvement of making at the shortcoming that now, the centering of general compasses was skidded, and the centering mode of the iron pin that adopts at present is transformed into sucker centering mode.

Task of the present utility model is finished as follows: the bipod that with bolt terminal do flexible connection on two bars is made of compasses scribing rod and centering bar, the distance of two bar lower ends fork is exactly the radius of a circle of drawing, two pen clips about the scribing rod lower end is equipped with, with bolt pen clip is connected with paintbrush, and pen clip can inject or change paintbrush, and centering bar lower end is equipped with the sucker that skids in the time of can preventing location, the center of circle.Sucker outer shape flare, lower bottom part are the spill covers, and top is the base type structure of spherical hinge, as shown in drawings, the end spherosome of hinge axis are housed in the cavity of base pit, and the hinge axis upper end is fastened on centering bar lower end with screw.The pit top of sucker top spherical hinge base has a circular hole, and this aperture forms necking down less than hinge axle head ball diameter, during installation, must exert oneself the hinge ball is pushed in the cavity of hinge base pit.After using compasses to draw contour, pull up sucker, because making hinge axle head ball be unlikely in cavity again, the drive of necking down comes off.When guarantee drawing the circle mapping compasses rotation flexibly, sucker top spherical hinge base pit internal cavity diameter should be a bit larger tham ball pivot chain rivet lower end spherosome diameter, greasing substance can be added in the gap of hinge.The horn mouth section of sucker lower end is presented spill, before drawing circumference at the hard smooth plate face of quality, need only the user a little firmly push sucker, just air in the spill cover can be squeezed away, form vacuum, form sucker by air pressure and inhale steady plate face, thereby replaced the centering iron pin of common compasses.At this moment, the centre of sphere of Sucking disk ball hinge is exactly the center of circle of the circumference of drawing.The centering sucker can use the elastomeric material injection mo(u)lding of rubber, plastics and so on to make.

This sucker centring type compasses are compared with existing common iron pin centring type compasses, and its outstanding advantage is that centering is firm non-slip, and rotation is mapped accurately flexibly, and is easy to use, easy to manufacture, with low cost.

Example structure below in conjunction with accompanying drawing is represented describes in further detail the utility model.

Accompanying drawing is a kind of embodiment sucker of the utility model Compasses concrete structure figure

As figure, make the terminal bolt (1) of doing flexible connection on compasses two bars, sucker centring means (6) is equipped with in its lower end of centering bar (2), sucker centring means (6) bottom is bell mouth shape, oriented recessed hood-like sucker, top is the spherical hinge understructure, hinge axis (5) end ball is housed in the pit cavity, trip bolt (3), ball pivot chain rivet (5) firmly is connected in the end of centering bar (2), the front end of scribing rod (4) is equipped with chalker, pen clip sheet (7) is equipped with in the lower end of setting-out bar (4), (8) two of set bolts are equipped with on pen clip sheet (7) top, and butterfly nut (10) is equipped with in the bottom, bolt (9) is in order to clamping and change paintbrush (11).

Claims

1, a kind of sucker centring type compasses, to do the intersection flexible connection on two bars and constitute with bolt (1) by scribing rod (4) and centering bar (2), the lower end of scribing rod (4) is equipped with the chalker that pen clip sheet (7), bolt (8), (9), (10) and detail pen are formed, and the device that the fixing sucker in the center of circle is felt relieved is equipped with in the lower end of the bar (2) that it is characterized in that feeling relieved.

2, sucker centring type compasses according to claim 1 is characterized in that centring means is that the ball pivot chain rivet (5) of ball, the upper end lower end that is fastened on centering bar (2) with screw (3) and sucker, top that lower bottom part is spill are that the centering sucker (6) of spherical hinge base is formed by the lower end.

3, sucker centring type compasses according to claim 2, it is characterized in that the feeling relieved top of pit of sucker (6) top spherical hinge base has circular hole, the diameter of circular hole is less than ball pivot chain rivet (5) end ball diameter, the diameter of centering sucker top spherical hinge base pit internal cavity makes centering bar (2) can work as the sucker suction and decides to rotate in spherical hinge behind the plate face greater than ball pivot chain rivet (5) lower end ball diameter.

4, sucker centring type compasses according to claim 3, it is characterized in that the ball of hinge axis (5) is firmly pressed fit in the hinge base of centering sucker (6), centering bar (2) is connected with centering sucker (6), and make that the ball of hinge axis (5) was unlikely from the pit of base when the slave plate face was pulled up the centering sucker.

5, sucker centring type compasses according to claim 4, it is characterized in that the air in the spill cover bottom the centering sucker (6) is squeezed when pushing centering bar (2), sucker firmly holds the plate face by atmospheric pressure makes the sucker center become the garden heart of the circumference of drawing.

6, sucker centring type compasses according to claim 5, the sucker (6) that it is characterized in that feeling relieved is to manufacture with elastomeric material.