CN2297323Y

CN2297323Y - Curve-drawing instrument for drawing conic section

Info

Publication number: CN2297323Y
Application number: CN 97236181
Authority: CN
Inventors: 张永
Original assignee: Individual
Current assignee: Individual
Priority date: 1997-05-27
Filing date: 1997-05-27
Publication date: 1998-11-18
Anticipated expiration: 2007-05-27

Abstract

The utility model provides a curve-drawing instrument for drawing conic sections. The utility model is suitable for drawing ellipses, hyperbolas and parabolas. The curve-drawing instrument for drawing conic sections is composed of a main bar shaft leg, a support bracket leg, a pendulum leg, etc. The support bracket leg is connected with a side leg, and the main bar shaft leg and the support bracket leg are connected to form a tripod through a screw. A graduated scale is fixed at the connecting position, and angle values for drawing are marked on the graduated scale. The main bar shaft leg is connected with the pendulum leg. When the circle is drawn, the tripod is fixed on the surface of the drawing. When the pendulum leg is rotated along the main bar shaft leg, the pendulum leg is also slid up and down along the main bar shaft leg, and ellipses can be drawn. The utility model has the advantages of simple structure, accurate drawing, convenient operation, time saving and labour saving.

Description

Conic-section plotter

The utility model relates to a kind of cultural goods, especially a kind of utensil of drawing conic section that is applicable to.

In prior art, people run into the situation that will draw conic section through regular meeting when drawing various figure; if lack of standardization with the curve that general trace-point method is drawn, and very time-consuming, effort, as not accurate enough again with the approximate technique of painting; therefore, brought very big inconvenience for drawing work.

The purpose of this utility model is to design a kind of being applicable to draw ellipse, hyperbola, parabolical utensil exactly in order to overcome above-mentioned the deficiencies in the prior art part.

Task of the present utility model is implemented as follows: a kind of conic-section plotter, it comprises mobile jib axle leg and the rack leg composition double pole mast that is connected with its end, its junction, upper end also is fixed with rule, it also comprise with mobile jib axle leg on swinging kick that is connected and the side leg that is connected with rack leg, swinging kick can slide up and down on mobile jib axle leg or can map along its rotation.

The utility model has following advantage compared with the prior art: the utility model be according to the tapered cut intersection of cylinder for oval principle design, can draw out ellipse exactly, ellipse as long as know oval major and minor axis radius so it can draw exactly.Can also draw exactly hyperbola and parabola, and it is simple in structure, and mapping is accurately, and is easy to operate, the time and labour saving.

Description of drawings:

Fig. 1 is a structure chart of the present utility model.

Fig. 2 is that the K of structure chart of the present utility model is to partial view.

Fig. 3 is of the present utility model 2 structure chart.

Fig. 4 is the vertical view of of the present utility model 2 structure chart.

Fig. 5 is drawing method figure I of the present utility model.

Fig. 6 is drawing method figure II of the present utility model.

Below in conjunction with accompanying drawing embodiment of the present utility model is described in further detail.As shown in Figures 1 and 2, it is made up of mobile jib axle leg 1, rack leg 2, rule 3, lead 4, square bar 5, sliding sleeve 6, tight lead cover 7, side leg 8 and minor axis 9 etc.Wherein mobile jib axle leg 1 is an elongate rod, its upper end is a square pole, a side-prominent semicircle piece on it, all the other are circular pin, its lower end end is a conical end, on its middle part round bar a plurality of annular grooves are arranged, upper end is connected by minor axis 9 work with the top and scale plate 3 circle centre positions of rack leg 2, and both junctions are isometric with the lower part; Be set with swinging kick on the mobile jib axle leg 1, it is by sliding sleeve 6, square bar 5, lead 4 and tight lead cover 7 are formed, and be fixed on the mobile jib axle leg 1 by screw, sliding sleeve 6 by one have circular hole square tube and on be welded with a long shaped plate and form, long shaped plate one end has circular hole, on the square tube wall screwed hole is arranged, and long shaped plate outer end and square bar 5 screws are connected and fixed, lead 4 is sleeved on the square bar 5, and be connected and fixed with screw, lead 4 lower end screw threads are connected with tight lead cover 7, and lead 4 is elongated shape round bars, its upper end has the square of protrusion, side has axial square hole on it, and a screw is radially arranged on the square hole wall, and its middle and lower part is an external screw thread, lower end has blind hole, and a plurality of axial grooves are arranged on the hole wall; Square bar 5 is elongated square bars, and the one head is homalocephalus and a circular hole is arranged; Tight lead cover 7 is that a termination is the short pipe of Taper Pipe, and its endoporus is a screwed hole; Rack leg 2 is elongated round bars, and its top is cut flat and protruded an arc bump in the top, and circular hole is arranged on the projection, and the bottom is also cut flat, and circular hole is arranged on it, and end is a tapered rod.The lower end is connected with a side leg 8, and side leg 8 is elongated flat bars, on the one head circular hole is arranged, and the other end is the awl end.When side leg 8 was opened maximum, its two awls end was determined a plane with 3 at the awl end of mobile jib axle leg 1, and it is when mapping, and the third hand tap end is fixed on the drawing, and rack leg 2 should be vertical with the figure paper with plane, mobile jib axle leg 1 place, maps to rotate square bar 5.Rule 3 is semicircle thin plates, be carved with two number of turns words on it, what carve on its outer ring is the scale numerical value of picture e when oval, and inner ring is carved is mobile jib axle leg 1 and the angular dimension numerical value θ of plumb line, and e determines as shown in Figure 4: AB represents mobile jib axle leg 1, AC is a rack leg 2, when cylinder during by the plane bevel, its section line is oval, oval e=sin (θ/2), the scale of e on the ∴ rule 3 is the value of sin (θ/2), will illustrate drawing method below:

Example 1: draw oval (the bevel intersection of cylinder): as shown in Figure 4: AB is a mobile jib axle leg 1, AC is a rack leg 2, and EF is swinging kick, adjusts the screw on the sliding sleeve 6 earlier, swinging kick EF can be slided up and down on mobile jib axle leg 1, lead can not be slided on square bar 5; When knowing oval heart a, b, c, two its ellipses that just can draw among the e, as only knowing b and e, then earlier rack leg 2 is screwed into the scale e place of rule 3, B is placed on picture elliptical center place, C is placed on the extended line at transverse place, side leg 8 is opened nail on drawing, swinging kick is adjusted to plumbous head on the minor axis summit, and swinging kick along sliding up and down on the mobile jib axle leg, can be drawn the ellipse of desiring to ask on drawing in rotation.

Example 2: draw general conic section: as shown in Figure 4: EF is swinging kick, O ' is the reverse extending line of EF and the intersection point of AB, just by the truncated cone summit, φ represents at the angle by the angle of truncated cone axle and bus, α represents at the angle that α angle and θ angle be complementary angle each other by the size of truncated cone axle and cross section (paper) angle; Determine the size at φ angle and α angle according to actual needs, make three legs point B, D, C stings on paper, swinging kick EF is fixed on the groove of mobile jib axle, EF can only be rotated along the AB groove, can not move up and down, regulate the screw of lead 4 and square bar 5 junctions, lead 4 can be slided up and down, during rotation swinging kick EF, lead 4 slides on square bar 5, and required section line on paper can draw.

Claims

1. conic-section plotter, it comprises mobile jib axle leg (1) and the rack leg (2) that is connected with its end is formed double pole mast, its junction, upper end also is fixed with rule (3); It is characterized in that: it also comprise with mobile jib axle leg (1) on swinging kick that is connected and the side leg (10) that is connected with rack leg (2), swinging kick can slide up and down on mobile jib axle leg (1) or can map along its rotation.

2. conic-section plotter according to claim 1 is characterized in that: described swinging kick is made up of sliding sleeve (6), square bar (5), lead (4) and tight lead cover (7).

3. conic-section plotter according to claim 1 and 2 is characterized in that: described sliding sleeve (6) is that a rectangular tube and an one face down bonding with circular hole is made up of a long shaped plate, and an end of long shaped plate has circular hole, and a screw is radially also arranged on the rectangular tube.

4. conic-section plotter according to claim 3, it is characterized in that: described lead (4) is an elongated round bar, its upper end has the square block of protrusion, side has axial square hole on it, one radial screw bore is arranged on the square hole wall, its underpart is an external screw thread, and lower end has blind hole, and a plurality of axial grooves are arranged on the hole wall.