CN2764633Y - Ellipsograph - Google Patents

Abstract

The utility model discloses a pair of elliptical compasses, which comprises a base which is in cross shape and is provided with two perpendicular grooved rails, slide blocks which are respectively positioned in the two grooved rails and are in sliding fit with each other and an axis ruler which is in movable connection with the slide blocks and can rotate with the slide blocks which slide in the grooved rails, wherein one end of the axis ruler is provided with tracing points. Because the utility model can adjust the length of a major axis and a minor axis, the utility model can draw ellipses of any ratios of the major axes and the minor axes; therefore, one pair of elliptical compasses can draw ellipses of various shapes and sizes, and can satisfy the actual needs of various using masses such as students, teachers, engineering drawing people, etc.

Description

A kind of ellipsograph

(1) technical field

The utility model relates to and a kind ofly can be used for learning, impart knowledge to students and the drawing instrument of specialty drawing definite a kind of oval ellipsograph of drawing of saying so.

(2) background technology

The compasses origin oneself for a long time, in the manual historical stage of drawing, play a part very importantly, be the indispensable manual drawing instruments of people for a long time.Yet but never the drawing instrument of picture ellipse occurs, and draws ellipse and bothers very much, is that the student learns, teacher imparts knowledge to students and a big defective of other drawing applications.

(3) summary of the invention

The technical problems to be solved in the utility model is: provide a kind of simple in structure, the ellipsograph easily of drawing.

In order to solve the problems of the technologies described above, the utility model comprise one be cross have the pedestal of two orthogonal grooved rails, be in above-mentioned two grooved rails respectively and the slide block that is slidingly matched, with slide block movable be connected and can with the slip of slide block in grooved rail rotate the axle chi, the axle chi an end be provided with tracing point.

Described axle chi is provided with slotted eye along its length, and the regulation cock that is used for connecting slide block is in this slotted eye, can on the regulation cock that slide block rotates is exposed at a end outside the slotted eye nut be arranged.

Described tracing point is a hole of nib or slotting pen.

0 scale of described axle chi faces tracing point.

Described pedestal lower end is provided with the metal needle of anti-sliding stop.

Every section grooved rail of described pedestal and axle chi are telescopic structure.

The beneficial effects of the utility model are, can regulate the length of major axis and minor axis, the ellipse of any axial ratio of can drawing, if grooved rail is arranged to stretching structure, oval size is random variation to a great extent just, ellipsograph ellipse of different shape and size that just can draw can satisfy the actual needs of various use such as student, teacher, Graphing of Engineering personnel colony thus.

(4) description of drawings

Fig. 1 is the utility model structural representation;

Fig. 2 is the A-A cutaway view of Fig. 1;

Fig. 3 is a fundamental diagram of the present utility model;

Wherein: 1, grooved rail, 2, the axle chi, 3, regulation cock, 4, slotted eye, 5, nut, ABCD represents metal needle, and O, O ' represent slide block, and P represents tracing point.

(5) specific embodiment

Pedestal is to be made of two sections orthogonal grooved rails 1, is cross, and two sections grooved rail 1 intersections are communicated with, and metal needle A, B, C, D that the lower end is provided with anti-sliding stop also can adopt sucker.Two slide block O ', O lay respectively in two sections grooved rails 1.The length of slide block O ', O is greater than the width of grooved rail 1 slotted eye, and this is more smooth and easy for slide block O ', O are moved in grooved rail 1.Axle chi 2 is connected with slide block O ', O are movable, and the specific requirement of connected mode is: one, slide block can be free to slide in grooved rail 1; Two, slide block can move on axle chi 2 length directions, but and the fixed position; Three, slide block can rotate with respect to axle chi 2.So just can the draw ellipse of different shape will reach this effect, can design multiple concrete mode according to the know-how of present technique field those of ordinary skill.The utility model is to achieve the goal by a regulation cock 3.The lower end of regulation cock 3 cooperates with slide block O ', O rotary type, top projecting shaft chi 2 is gone up the slotted eye 4 that is provided with along its length, regulate the distance back and regulation cock 3 is fixed on (also rotary part can be located at the upper end, stiff end is located at the bottom) on the chi 2 together with slide block O ', O with nut 5.

Draw oval accuracy for guaranteeing to make, can on axle chi slotted eye 4 limits scale be set, 0 scale is at P point place, just need not resemble when drawing like this to use the compasses definite radius of circle on rule in advance.

The tracing point P that is located at a chi 2 one ends according to different demands can be designed to fixing at that point nib (pencil, pen) or the hole (pencil, pen, chalk etc.) of inserting pen to adapt to different demands.

Every section grooved rail of pedestal 1 and axle chi 2 are set to telescopic structure, or set up the annex of lengthening, can further enlarge the scope of application of the present utility model.

Mapping principle of the present utility model is:

As shown in Figure 3, establish

| O ' P|=b, | OP|=a, ∠ PO ' B=∠ PO ' F=δ, establish the P point coordinates (x, y), then:

x＝acosδ y＝bsinδ

∴ x/a＝cosδ y/b＝sinδ

∴ x ²/a ²+y ²/b ²＝cos ²δ+sin ²δ＝1

So the track that P is ordered is oval, a and b are respectively major semiaxis and semi-minor axis.

Using method of the present utility model is:

See figures.1.and.2, at first make A, B, C, D 4 points (metal needle) be fixed in paper (or blackboard), regulate the position of regulation cock 3 on axle chi 2 according to scale then, make | O ' P|=semi-minor axis b, | OP|=major semiaxis a, behind nut 5 fixed positions, hold tracing point P position on the chi 2, it is oval that the motion of P point was promptly got in one week, and in the motion of P point, slide block O ', O slide in grooved rail 1 respectively.

Claims (6)

1, a kind of ellipsograph, it is characterized in that: comprise one be cross have the pedestal of two orthogonal grooved rails (1), be in above-mentioned two grooved rails (1) respectively and the slide block that is slidingly matched (O ', O), with the movable axle chi (2) that is connected and can rotates with the slip of slide block in grooved rail (1) of slide block (O ', O), an end of axle chi (2) is provided with tracing point (P).

2, a kind of ellipsograph according to claim 1, it is characterized in that: described axle chi (2) is provided with slotted eye (4) along its length, the regulation cock (3) that is used for connecting slide block (O ', O) is in this slotted eye (4), and can be exposed at relative to the regulation cock (3) that slide block (O ', O) rotates on the end outside the slotted eye (4) has nut (5).

3, a kind of ellipsograph according to claim 1 and 2 is characterized in that: described tracing point (P) is a hole of nib or slotting pen.

4, a kind of ellipsograph according to claim 3 is characterized in that: 0 scale of described axle chi (2) faces tracing point (P).

5, a kind of ellipsograph according to claim 3 is characterized in that: described pedestal lower end is provided with the metal needle (A, B, C, D) of anti-sliding stop.

6, a kind of ellipsograph according to claim 1 and 2 is characterized in that: every section grooved rail of described pedestal (1) and axle chi (2) are telescopic structure.

Images