CN102582325A

CN102582325A - Adjustable ellipse compasses

Info

Publication number: CN102582325A
Application number: CN2011100201789A
Authority: CN
Inventors: 百顺
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-01-04
Filing date: 2011-01-04
Publication date: 2012-07-18

Abstract

Adjustable ellipse compasses comprise a positioning device and an ellipse drawing device. The positioning device consists of a fixing rack, an adjusting handle, an original point pin, two focal point positioning pins, two focal length adjusting rods and two line sleeving grooves. The two focal length adjusting rods are meshed with teeth of the adjusting handle and penetrate through the fixing rack to be fixed together, focal lengths are adjusted by means of rotating the adjusting handle, and the ellipse drawing device consists of a sliding trolley, a sliding rod, a sliding rod fixing sleeve, a fixing penholder, an adjusting rod, a thrust spring, an auxiliary spring, a wire winding wheel, a wire penetrating hole and a fixing screw. The adjusting rod of the fixing penholder is fixed by the fixing screw via the sliding trolley, the thrust spring and the sliding trolley are sequentially sleeved on the sliding rod, the sliding rod fixing sleeve is clamped in a sliding rod fixing rack, then the sliding rod fixing rack is sleeved on the adjusting handle, the two focus point positioning pins are connected with the fixing penholder by a thin rope, and the two devices are integrated. Accordingly, the ellipse compasses can meet technical requirements of drawing ellipses in various shapes.

Description

Adjustable Ellipsograph

Affiliated technical field

The present invention relates to a kind of drawing instrument, a kind of specifically adjustable Ellipsograph.

Background technology

At present, drawing oval used method roughly has the template of use picture ellipse and utilizes compasses, ruler to combine picture ellipse etc.It is oval to use template to draw, and the size that the template of can only drawing is oval has certain limitation.And utilize compasses, ruler to combine picture oval, and its program is too complicated, and line has certain error by hand between points, does not have the basic picture of people of certain schooling not go out desired ellipse, and also has inadequate natural endowments such as plotting speed is slow.

Summary of the invention

Certain limitation is arranged and have certain inadequate natural endowments such as error, the present invention that picture the Ellipse tool of a kind of special use is provided in order to overcome the oval used method of present picture.This invention can be satisfied engineering drawing personnel, student and the needs demand with the Ellipsograph operating personnel, the ellipse of the required picture of simple, fast completion.

The technical solution adopted for the present invention to solve the technical problems is: be tied its two with thin piece of string, be enclosed within on two nails and stretch the method that straight picture one circle draws ellipse with pencil then, design this Ellipsograph.It is made up of location and oval two devices of picture.Positioner is made up of fixed mount, adjustment handle and initial point pin, two focus pilot pins and focal length adjusting lever, two cover wire casings.The tooth engagement of two focal length adjusting levers and adjustment handle, and pass fixed mount and be fixed together, rotation adjustment handle is adjusted focal length; Draw oval device by slide trucks, sliding bar, sliding bar fixed cover, fixedly penholder and adjusting lever, thrust spring, secondary spring, winding wheel, through wires hole, hold-down screw are formed.Fixedly the penholder adjusting lever is fixed with hold-down screw through slide trucks; Be enclosed within thrust spring, slide trucks on the sliding bar successively; The sliding bar fixed cover is stuck in the sliding bar fixed mount, again the sliding bar fixed mount be enclosed within the adjustment handle on, with thin piece of string two focus pins and fixedly penholder connect together; Make two devices and be one, thereby reached the specification requirement that this Ellipsograph can draw the different shape ellipse.In order to make the picture ellipse that technical data and fixing point accurately arranged, the special pilot pins such as the focal length adjusting lever that indicates scale, sliding bar, fixedly penholder adjusting lever, and initial point pin, focus pin that on this Ellipsograph, are provided with.By its length of scale adjustment of indicating on adjusting lever, the sliding bar, can arbitrarily adjust oval shape and size in use; The focus pilot pin is designed to the berrette file shape, and its needle point is a line with the cover wire casing back side, guarantees that fine rule is on the upright position of focus; Fixedly the through wires hole on the penholder is positioned at center directly over the nib, guarantees that oval data are more accurate; In order to prevent that picture is little when oval, two focal length adjusting levers stretching on the fixed mount both sides block slide trucks and rotate, and fixedly the penholder adjusting lever also can arbitrarily be adjusted length, avoids blocking the sliding bar rotation; Secondary spring is stuck in sliding bar fixed cover spring groove and the slide trucks spring groove, works to stretch straight cord.

The invention has the beneficial effects as follows, without the standard ellipse of other instrument with regard to can simple, fastly draw different shape and size.

Utilize this Ellipsograph, available two kinds of methods needed ellipse that draws.

Method:

(1) when known focal length and major semiaxis, earlier two focus pilot pins on focus, aim at the major semiaxis of having confirmed to tip of a pencil again, the length of cord is fixed, with the hand sliding bar that laterally turns around, needed ellipse has just drawn then.

(2) when known focal length and semi-minor axis, earlier on two focus pilot pin aligned focus, sliding bar forward to its focal lines at an angle of 90; Aim at semi-minor axis to tip of a pencil; Cord length is fixed, and with the hand sliding bar that laterally turns around, needed ellipse has just drawn then.

When knowing following data, can calculate focal length and major semiaxis or semi-minor axis earlier, the ellipse that utilizing one of said method just can draw again needs comes.

2. eccentricity:

(K is known), major semiaxis a ₁=M (M is known);

3. eccentricity:

(K is known), semi-minor axis b ₂=N (N is known);

4. eccentricity:

(K is known), focal length c ₃=Q (Q is known);

Description of drawings

Below in conjunction with accompanying drawing and embodiment the utility model is further specified.

The three-dimensional front view of Fig. 1 Ellipsograph

Fig. 2 A-A cutaway view

Fig. 3 B-B cutaway view

Fig. 4 C-C cutaway view

Fig. 5 D-D cutaway view

Fig. 6 E-E cutaway view

Fig. 7 F-F cutaway view

Fig. 8 G-G secondary spring stereogram

Like 1. fixed mounts among Fig. 1,2. adjust handle, 3. initial point pin, 4. focal length adjusting lever, 5. focus pilot pin; 6. cover wire casing, 7. sliding bar fixed mount, 8. sliding bar fixed cover, 9. sliding bar, 10. thrust spring; 11. secondary spring, 12. slide trucks, 13. fixedly penholder and adjusting levers, 14. nibs, 15. nibs are fixing female; 16. fine rule, 17. through wires holes, 18. winding wheels, 19. fixed screws, 20. spring grooves.

The specific embodiment

As shown in fig. 1; This Ellipsograph with a length-adjustable cord (16), is enclosed within it respectively in two focus pilot pins (5) cover wire casing (6) groove; Pass the through wires hole (17) on the fixing penholder (13) to cord (16) two then, be fixed on the winding wheel (18).Because sliding bar fixed cover (8) is fixed on sliding bar fixed mount (7) lining, and fixed mount (7) is enclosed within outside the adjustment handle (2), is the center rotation with it.Slide trucks (12) drive fixedly penholder is strained cord (16) under the elastic force effect of thrust spring (10) and secondary spring (11).When with hand lateral rotation sliding bar (9); Because of the change of angle and distance, fixedly penholder (13) receives the restriction of cord (16) on the sliding bar (9) under the drive of slide trucks (12); Clocklike slowly slide, make nib (14) on drawn material, slowly move the needed standard ellipse of drawing and come.

Like the adjustment tooth and the engagement of the tooth on the focal length adjusting lever (4) of Fig. 2, adjustment handle (1) as shown in Figure 3, rotate the adjustment focal length with adjusting handle 1.

Inside fixedly sliding bar (9) is compressed in thrust spring (10) again like Fig. 4, sliding bar fixed cover (8) as shown in Figure 5, does not influence slide trucks (12) and return, and can be through the length of its adjustment sliding bar (9).

Be enclosed within on the sliding bar (9) like Fig. 6, slide trucks (12) shown in Figure 7, help the shop spring (11) to block, promptly fixing fixedly penholder (13) is arranged on the top to winding wheel (18) again, adjusts the length of cord as required.

Secondary spring as shown in Figure 8 (11) helps thrust spring (10) to make slide trucks (12) cord (16) guarantee to stretch straight state all the time toward extrapolating.

Claims

1. adjustable Ellipsograph; It is made up of location and oval two devices of picture; It is characterized in that: positioner is made up of fixed mount, adjustment handle and initial point pin, two focus pilot pins and focal length adjusting lever, two cover wire casings; The tooth engagement of two focal length adjusting levers and adjustment handle, and pass fixed mount and be fixed together; Draw oval device by slide trucks, sliding bar, sliding bar fixed cover, fixedly penholder and adjusting lever, thrust spring, secondary spring, winding wheel, through wires hole, hold-down screw are formed; Fixedly the penholder adjusting lever is fixed with hold-down screw through slide trucks; Be enclosed within thrust spring, slide trucks on the sliding bar successively; The sliding bar fixed cover is stuck in the sliding bar fixed mount; Be enclosed within the sliding bar fixed mount on the adjustment handle again, with thin piece of string two focus pins and fixedly penholder connect together, make two devices and be one.