CN2683402Y - Conical section gauge (ruler) - Google Patents

Abstract

The utility model discloses a conical section gauge (ruler) with full functions used to quickly and accurately draft. When the screw nut (8) of the core point of the angle gauge is in a loosening and a fastening states, a rectangular coordinate state and a cross state are formed; in the two states, the need for the draft of the geometry teaching can be satisfied. The blank of the conical section gauge is filled by the arrangement and the application of the barbed needle (10) and the retractabler (6) of the parabola.

Description

Conic-section plotter (chi)

Technical field

The utility model relates to a kind of teaching drawing instrument.

Background technology

At present, known teaching drawing instrument mainly is ruler, compasses, set square, protractor etc., and these drawing instruments are function singleness not only, and mapping speed is very slow, can not draw any conic section at all.Prior art is opened " the teaching plotter " of Huaihe River teacher (myself) invention, the patent No.: 01255000.0 referring to Changshou District Ge Lan middle school, Chongqing City.Though this patent has many good qualities, do not draw hyperbola, parabolical function is so the teaching drawing instrument of China still lags behind.

Summary of the invention

In order to change present teaching drawing instrument function singleness, mapping coverage is limited, the deficiency that plotting speed is very slow, the utility model provides a kind of conic-section plotter (chi), except that repertoire with " teaching plotter " patent, increased hyperbola newly, parabolical function has fundamentally solved the difficult problem of drafting conic section (ellipse, hyperbola, parabola).

The technical scheme that its technical problem that solves the utility model adopts is: on the basis of " teaching plotter ", disposed one " crochet hook " and one transportable " parabola distributor " for horizontal chi.When " crochet hook " is contained on the setting-out pin, just can draw hyperbola according to method shown in Figure 1.When after loading onto " parabola distributor " on the horizontal chi, just can draw parabola according to method shown in Figure 2.

The beneficial effects of the utility model are: can be under the conditions that does not need any other drawing instrument, and the demand of meeting geometric teaching mapping.

Description of drawings

Embodiment below in conjunction with accompanying drawing further specifies the utility model.

Fig. 1 is structural representation of the present utility model and first embodiment schematic diagram.

Fig. 2 is the schematic diagram of second embodiment of conic-section plotter (chi).

One of 1-handle 2-device hole 3-curved slot 4-vertical angles angle index line 5-stable card 6-parabola distributor 7-ellipse (hyperbola) cover line distributor 8-protractor center nut 9-compasses tiptoe and tiptoe index line 10-setting-out tiptoe (crochet hook) and tiptoe index line () longitudinal ruler among the figure, (two) are chi laterally

The specific embodiment

In Fig. 1, loosening and tighten ellipse (hyperbola) cover line distributor (7), can determine the length of ellipse (hyperbola) required cover line arbitrarily.When drawing hyperbola, left hand is caught fixed point P, and the right hand inserts paintbrush and beats under the M point place of turning round blows slowly picture along the cover line, just obtains a curve, and the line end positions is overlapped in exchange, and another curve can draw again.

In the embodiment shown in Figure 2, take off the horizontal chi (two) that parabola distributor (6) is housed.Allow setting-out pin (10) lean against on the longitudinal ruler (), determine the length of the required cover line of picture parabola again by parabola distributor (6), and will overlap the line top and be fixed on the F point, catch on the M point with paintbrush, the right hand with horizontal chi (two) in lower slider, left hand catches on the curve that firmly draws in cover alignment right front, is exactly known parabola.

Claims (1)

1. A kind of conic-section plotter (chi) is combined longitudinal ruler () and horizontal chi (two) by protractor heart point nut (8), it is characterized in that horizontal chi (two) is provided with a crochet hook (10) and a transportable parabola distributor (6).