CN201140626Y

CN201140626Y - Compasses for drawing ellipses

Info

Publication number: CN201140626Y
Application number: CNU2007200884900U
Authority: CN
Inventors: 刘盛英杰
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-11-26
Filing date: 2007-11-26
Publication date: 2008-10-29
Anticipated expiration: 2017-11-26

Abstract

The utility model relates to an elliptical compass, which belongs to the drawing instruments. The elliptical compass comprises a compass 4, two corner forks of the compass 4 are connected with a focus belt 3 and a length adjusting belt 5, a divider caliper 2 is penetrated on the length adjusting belt 5, and the center of the divider caliper 2 is opened with a pen hole 1. The divider caliper 2 is added on an existing compass 4, the operation is convenient, and an ellipse can be drawn by a pen in the pen hole 1 when the divider caliper 2 slides along a track after a long diameter and a short diameter are assured. The elliptical compass is simple, which is not limited by any occasions and places, and can simply and conveniently finish drawing ellipses. The elliptical compass is suitable for blackboard teaching, and is also suitable for drawing practice of student's homework.

Description

A kind of Ellipsograph

Technical field

The utility model relates to a kind of drawing instrument, particularly a kind of Ellipsograph.

Background technology

Draw ellipse and used the whole bag of tricks all unsatisfactory in teaching, main deficiency is that limitation is big, and complex structure is not easy to operate.

Summary of the invention

The purpose of this utility model is the defective dumb and too complicated at above-mentioned instrument, proposes a kind of Ellipsograph, and it can finish ellipse drawing simply and easily.

The purpose of this utility model is achieved in that a kind of Ellipsograph, comprises compasses, sticks for two jiaos of described compasses to be connected with the focusing band and to transfer long band, transfers long being with to be installed with divider calipers, and the center of divider calipers has a hole.

The arc trajectory hole that the utility model can also have on the sidewall of divider calipers is transferred long band to pass the arc trajectory hole and is connected with two jiaos of forks of compasses.

The utility model has the advantages that: the compasses in former use add a divider calipers, and are easy to operate, and major diameter, minor axis be in case determine that divider calipers slides along track, the pen in the hole ellipse that just can draw.Instrument is simple, is not subjected to the restriction in use occasion place, can finish ellipse drawing simply and easily, is suitable for black board teaching, also is suitable for the mapping exercise of students' work.

Description of drawings

Fig. 1 is a schematic diagram of the present utility model

Fig. 2 is the cutaway view of the utility model divider calipers 2

Among the figure, a hole 1, divider calipers 2, focusing are with 3, compasses 4, transfer longly be with 5, arc trajectory hole 6.

The specific embodiment

Below in conjunction with the description of drawings and the specific embodiment the utility model is described in further detail.

As shown in Figure 1 and Figure 2, a kind of Ellipsograph of present embodiment comprises compasses 4, and two jiaos of described compasses 4 are stuck and being connected with focusing and being with 3 and transfer and longly be with 5, transfer long being with to be installed with divider calipers 2 on 5, and the center of divider calipers 2 has a hole 1.The arc trajectory hole 6 that has on the sidewall of divider calipers 2 is transferred length to pass arc trajectory hole 6 with 5 and is connected with two jiaos of forks of compasses 4.The arc trajectory hole 6 that has on the sidewall of divider calipers 2 is transferred length to pass arc trajectory hole 6 with 5 and is connected with two jiaos of forks of compasses 4.Focusing is with 3 centre-to-centre spacing that can control on the compasses 4 two jiaos of forks, transfers long with 5 movement locus that can control divider calipers 2 on 1 center, hole.Adjust focusing with 3 with transfer longly penholder to be gone in the hole 1, transfer length to be with 5 with divider calipers 2 tensions with 5 regular length, and longly be with 5 to slide along transferring, the half of elliptic arc that can draw will transfer length with 5 opposite sides that go to compasses 4 again, the in addition half of elliptic arc that draws is equally finished an ellipse.Adopt simple tools, add a divider calipers on existing compasses, easy to operate, major diameter, minor axis be in case determine, divider calipers 2 is along tracks pen in the hole 1 ellipse that just can draw that slides.Instrument is simple, is not subjected to the restriction in use occasion place, can finish ellipse drawing simply and easily, is suitable for black board teaching, also is suitable for the mapping exercise of students' work.

Claims

1. an Ellipsograph comprises compasses (4), it is characterized in that: stick for two jiaos of described compasses (4) and be connected with focusing band (3) and the long band of accent (5), transfer long being with on (5) to be installed with divider calipers (2), the center of divider calipers (2) has a hole (1).

2. a kind of Ellipsograph according to claim 1 is characterized in that: the arc trajectory hole (6) that on the sidewall of divider calipers (2), has, and transfer long band (5) to pass arc trajectory hole (6) and be connected with two jiaos of forks of compasses (4) again.