CN2049188U - Drawing tool for drawing axonometric ellipse - Google Patents

Abstract

The utility model relates to a drawing tool for drawing axonometric ellipses, which is composed of a planetary gear ellipsograph and an angle board with special angles, wherein, the azimuths of the major axis and the minor axis of an axonometric ellipse can be determined by the angle board, and the central position, the sizes of the major axis and the minor axis of the axonometric ellipse can be determined by coordinate conversion. The axonometric ellipse to be drawn can be drawn by the planetary gear ellipsograph. The drawing tool for drawing axonometric ellipse has the advantages of simple structure and accurate, convenient and quick drawing. The drawing tool for drawing axonometric ellipse can draw the axonometric projection-ellipses of the circles on different planes by one stroke, and can draw various ellipses on engineering.

Description

Drawing tool for drawing axonometric ellipse

The utility model relates to a kind of axle of drawing and surveys oval drafting instrument.

Axonometric drawing can reflect the shape of three directions of object length simultaneously in a projection, be rich in third dimension.But the circle of the axonometric projection face of being not parallel to, its axonometric projection is generally ellipse, and it is cumbersome to exist the technique of painting with " four heart circular arc approximation methods " painted scroll survey ellipse, and drawing speed is slow, and the line switching is not slick and sly, shortcomings such as ellipse distortion.

The purpose of this utility model be to provide a kind of can be accurate, the axle that draws is apace surveyed an oval drafting instrument.

Axle of the present utility model is surveyed oval drafting instrument by the planetary gear type ellipsograph with have an angle board at interception angle and form.Described planetary gear type ellipsograph comprises rotary handle, epicyclic train, two poles, two power transmission shafts, four universal joints, two free bearings, fixed feet is rotated leg and scale, epicyclic train comprises driving gear, idler gear and driven gear and tooth rest, the number of teeth of driving gear are the idler gear and the driven gear number of teeth 2 times, and an end and the tooth rest of two poles are hinged, its other end is hinged with a free bearing respectively, the axle of fixed feet is passed the free bearing of the pole end that is positioned at driving gear one side, and links to each other by two universal joints with the gear shaft of power transmission shaft and driving gear, so that fixed feet and driving gear synchronization action.Gyroaxis on the horizontal ruler passes the free bearing of another pole end, and links to each other by two universal joints with the gear shaft of another power transmission shaft and driven gear, so that horizontal ruler and driven gear rotate synchronously.Between fixed feet and the free bearing, the end face bearing is housed respectively between horizontal ruler and the free bearing, be beneficial to rotate, be with the rotation leg on the horizontal ruler, rotating leg both can move along horizontal ruler, also can fix by screw, rotary handle is contained on the tooth rest, have on the described angle board become with datum level 7 ° 10 at axle interception angle ', 41 ° 25 ', 7 ° 1 ' 55 " with four angles of 45 °; draw axle survey ellipse; the general center that needs to determine ellipse; ellipse length; minor axis orientation and oval length; minor axis dimension, the center of ellipse can be carried out conversion to axle survey coordinate according to the coordinate of the known round heart and be obtained.Oval long and short axle orientation can be determined by special angle board of the present utility model.Oval long, minor axis dimension can converse according to axial LVFS, also can use descriptive geometry ABC that axonometric drawing is carried out reciprocal coordinate transform draws, at last the fixed feet of ellipsograph is pricked on the work elliptical center, adjust and rotate leg, make its distance equal ellipse short shaft partly to the scale gyroaxis, the fixed feet center equals transverse partly to the distance of scale gyroaxis, handle on the rotary teeth wheel carrier, horizontal ruler and rotation leg are returned around fixed feet to circle, scale is driven by driven gear simultaneously, drive the rotation leg and rotated for two weeks around the scale gyroaxis, the track that rotates the terminal paintbrush of leg is the ellipse of the work of asking.

The utility model has the advantages that simple in structure, the drawing accurately, easily and fast, axonometric projection one ellipse of the circle on the variant plane of can drawing and the various ellipses on the engineering.

Fig. 1 is the structural representation of ellipsograph of the present utility model, among the figure, 1 fixed feet, 2 axles, 3 nuts, 4 bearings, 5 free bearings, 6 universal joints, 7 poles, 8 power transmission shafts, 9 tooth rests, 10 gear shafts, 11 driving gears, 12 handles, 13 gear shafts, 14 idler gears, 15 driven gears, 16 gear shafts, 17 gyroaxises, 18 scales, 19 nuts, 20 screws, 21 rotate leg.

Fig. 2 is the left view of Fig. 1, and among the figure: 5 free bearings, 7 poles, 9 tooth rests, 12 handles, 18 scales, 21 rotate leg, 22 hinge pins, 23 nuts, 24 hinge pins.

Fig. 3 is the structural representation of universal joint 6.

Fig. 4 is an angle board structural representation of the present utility model, among the figure: α be 82 ° 50 ', β be 48 ° 35 ', A is a datum level, this angle board is by 30 °, 60 ° right angle triangle transformations.

Fig. 5 is an angle board structural representation of the present utility model, among the figure: γ=82 ° 58 ' 5 ".B is a datum level, and this angle board is transformed by 45 ° of isosceles right angle triangles.

Embodiment: referring to Fig. 1～5, epicyclic train is by the driving gear 11 that is fixed in the tooth rest 9, idler gear 14 and driven gear 15 are formed, the modulus of driving gear 11 is 0,4, the number of teeth is 36, the modulus of idler gear 14 and driven gear 15 is 0,4, the number of teeth is 18, the gear shaft 10 of driving gear 11 is connected by two universal joints 6 with power transmission shaft 8 and axle 2, axle 2 and fixed feet 1 are to be threaded, there are three locking pins fixed feet 1 bottom, the gear shaft 16 of driven gear 15 also is connected by two universal joints 6 with power transmission shaft 8 and gyroaxis 17, and gyroaxis 17 and bending horizontal ruler 18 are with on the scale 18 and rotate leg 21 to be threaded, rotating leg 21 can be fixed on the scale 18 by screw 20, rotates leg 21 ends drawing pen is housed.Two poles 7 are enclosed within the outside of two power transmission shafts 8 respectively, and it is hinged by hinge pin 22 and tooth rest 9, its other end is hinged by hinge pin 24 and free bearing 5, two free bearings 5 are enclosed within axle 2, gyroaxis 17 outsides respectively, between free bearing 5 and fixed feet 1 and the scale 18 end face bearing 4 is housed, angle board can utilize existing 45 ° and 30 °, 60 ° set square transformations to form, tri-angle-holed right angles in the middle of 45 ° of set squares change 82 ° 58 ' 5 into "; tri-angle-holed its right angle in the middle of 30 °, 60 ° set squares changes 82 ° 50 into ', an one acute angle changes 48 ° 35 into '.

Claims (1)

1, survey oval drafting instrument for a kind of, it is characterized in that by the planetary gear type ellipsograph and have an angle board at interception angle forming, described planetary gear type ellipsograph comprises rotary handle 12, by driving gear 11, the epicyclic train that idler gear 14 and driven gear 15 and tooth rest 9 are formed, two poles 7, two power transmission shafts 8, four universal joints 6, two free bearings 5, fixed feet 1, rotate leg 21, bearing 4 and horizontal ruler 18, the number of teeth of driving gear 11 is 2 times of the number of teeth of idler gear 14 and driven gear 15, one end of two poles 7 is hinged with tooth rest 9 respectively, its other end is hinged with a free bearing 5 respectively, being fixed on axle 2 on the fixed feet 1 passes the free bearing 5 of pole 7 ends that are positioned at driving gear 11 1 sides and links to each other by two universal joints 6 that are contained in pole 7 with the gear shaft 10 of power transmission shaft 8 and driving gear 11, make fixed feet 1 and driving gear 11 synchronization actions, the free bearing 5 that gyroaxis 7 on the horizontal ruler 18 passes pole 7 ends that are positioned at driven gear 15 1 sides links to each other by two universal joints 6 that are contained in pole 7 with the gear shaft 16 of another power transmission shaft 8 and driven gear 15, horizontal ruler 18 and driven gear 15 are rotated synchronously, rotating leg 21 is enclosed within on the horizontal ruler 18, both can slide along horizontal ruler 18, also can be fastened on the scale 18, between fixed feet 1 and the free bearing 5 by screw 20, between horizontal ruler 18 and the free bearing 5 end face bearing 4 is housed respectively; Have on the described angle board with datum level to become 41 ° 25 respectively ', 7 ° 1 ' 55 ", 7 ° 10 ' and four axle interception angles of 45 °.

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