CN2310683Y

CN2310683Y - Ellipse gauge

Info

Publication number: CN2310683Y
Application number: CN 97248319
Authority: CN
Inventors: 杨振起
Original assignee: Individual
Current assignee: Individual
Priority date: 1997-11-06
Filing date: 1997-11-06
Publication date: 1999-03-17
Anticipated expiration: 2007-11-06

Abstract

The utility model belongs to the teaching tool, particularly a tool for specially drawing ellipses. The utility model comprises a fixed arm, a rocking arm, a diamond arm and a conversion arm that all form a flat bar shape and are drilled with hollow slots. A connecting shaft having a locking bolt, a connecting shaft provided with the conversion arm and a sliding shaft are mutually connected, and the connecting shafts slide or rotate in each arm slot. The utility model has the advantages of simple structure, low cost, convenient operation and rapid and accurate drawing of ellipses, which is suitable for teachers and students to use.

Description

Ellipsograph

The utility model belongs to a kind of educational aid, especially can draw oval instrument specially.

The instrument of present known drafting ellipse is many, what have utilizes compasses, ruler is drawn ellipse figure, what have utilizes elliptical modes to pull to draw ellipse figure, the fake that utilizes that has is drawn ellipse figure, the calculating described point that passes through that has utilizes curve ruler to draw ellipse figure, but the each have their own weakness of figure circle diagram shape that above-mentioned several instruments are drawn, the figure circle diagram shape of utilizing the compasses ruler to draw can only be mapped indirectly, step is many, only is the figure that is similar to, and utilizes elliptical modes to pull and can only depict the figure that mould is pulled, can't draw according to arbitrary parameter, utilize fake to draw ellipse figure, it is inaccurate to draw, and adjusts the parameter trouble, utilize curve to pull drafting ellipse diagram shape by calculating described point, calculate described point and draw very cumbersome.

The purpose of this utility model be to avoid above-mentioned weak point of the prior art and provide a kind of can be according to given focal length, major axis parameter and focal position are directly drawn the Ellipsograph of required ellipse figure fast and accurately.

The purpose of this utility model can realize by following measure:

It includes fixed arm, rocking arm, water chestnut arm, conversion arm the utility model, fixed axis, and the connecting axle of deciding bolt with lock is equipped with connecting axle, sliding axle and the nib of conversion arm.Press handle, rocking handle, bumper pad, pilot pin.Fixed arm is L shaped flat bar, and minor face is down, and long limit is last, and the minor face front end is equipped with fixed axis, and the bar shaped dead slot is left on the long limit of flat bar, is equipped with lockly to decide the connecting axle of bolt from the initial length scale that is carved with of fixed axis correspondence position in groove; Rocking arm is that flat bar one end is fixed on the fixed axis, the other end is equipped with rocking arm; leave the bar shaped dead slot on the rocking arm; the connecting axle of deciding bolt with lock is housed in dead slot; the rocking arm flat bar is carved with the length scale on the left side; the water chestnut arm is the rhombus framework that four water chestnut arms are formed; the circular hole of its four end is connected with the connecting axle that the conversion arm is housed with the connecting axle of deciding bolt with lock; between two connecting axles the conversion arm is housed; the conversion arm is a flat bar; total length has dead slot, two connecting axles of conversion arm are housed, installation sliding axle and be fixed on nib under the axle in the dead slot of the intersection of conversion arm and rocking arm.

The utility model is simple in structure, and is cheap, easy to operate, can draw ellipse figure fast and accurately according to painting fixed focal length, major axis and focus, and suitable platform Faculty and Students use.

Accompanying drawing is the utility model structural perspective.

Below in conjunction with accompanying drawing the utility model is further described:

As shown in the figure: it includes fixed arm 1 the utility model; Rocking arm 2; Water chestnut arm 3; Conversion arm 4; Fixed axis 5; The connecting axle 6 of locking bolt; Connecting axle downslide moving axis 8 and the nib 8 of dress conversion arm; Press handle 9; Rocking handle 10; Bumper pad 11; Pilot pin 12; Fixed arm is the L-type flat bar; The right side turn 90 degrees fell; Minor face is lower, and long limit is upper, and the minor face front end is equipped with fixed axis 5; Bumper pad 11 is housed below the minor face on the long limit of minor face centre; Press handle 9 is housed, and left hand is held press handle 9 and is pressed down bumper pad and fixed arm 1 can be pressed solidly on drawing, and the bar shaped dead slot is left on the long limit of flat bar; The connecting axle 6 of locking bolt is housed in groove; In groove, slide and be locked on the optional position, the initial length scale that is carved with of self-retaining axle 5 correspondence positions, the length of the latched position of connecting axle 6 namely represents focal length. Rocking arm 2 is flat bar; The one end is fixed on the fixed axis 5; Hold rocking handle 10 rocking arm is rotated around fixed axis 5 but the other end is equipped with rocking handle 10 right hands that can rotate; Rocking arm 2 is left the bar shaped dead slot; The connecting axle 6 of locking bolt is housed in dead slot; In groove, slide and be locked on the optional position; Rocking arm is carved with the length scale on the 2 flat bar left sides; The length of the latched position of connecting axle 6 namely represents long axis length; Water chestnut arm 3 is the rhombus framework that four water chestnut arms form; Only playing its four ends circular hole of connection function is connected with the connecting axle 7 that the conversion arm is housed with the connecting axle 6 of locking bolt; Between two connecting axles 7 conversion arm 4 is housed; The conversion arm is flat bar; Total length has dead slot; Two connecting axles 7 are slided in groove; At intersection two arms 2 of conversion arm 4 with rocking arm 2; Sliding axle 8 is installed in 4 the dead slot and is fixed on nib 8 under the axle; Sliding axle 8 can slide in dead slot; Fixed axis 5 connecting axles 6; 7 sliding axles 8 rotate or slip in clamping; Two outsides of each arm are provided with the axle shelves with upright position and the flexibility of retainer shaft; The connecting axle 6 of locking bolt; Machining screw on the axle beyond the axle shelves in order to connecting axle is locked in bolt fixedly ward off or rocking arm on; The connecting axle 6 of fixed axis 5 and locking bolt can insert pilot pin 12 with the accurate location of definite bifocal and appraise and decide focal length and the precise length of major axis on drawing in axle centre-drilling hole; Sliding axle 8 machining screw and axle is split into two halves uses again bolted to insert nib on the axle of axle 8 centre-drilling hole axle shelves outer lower sides; The effective length of each arm has the certain proportion relation; Fixed arm 1 effective length determines the effective length of rocking arm greater than the fixed arm effective length according to the oval maximum focal length of paint; Can determine according to the oval maximum major axis of paint; The length of water chestnut arm is not less than half of fixedly warding off effective length and rocking arm effective length sum; The length of conversion arm is not less than two times of water chestnut arm; So just can draw the size that ellipse that maximum focal radius equals the water chestnut brachium can design each arm according to this; It is in order not make the parts motion interrupted but the vertical component on both sides has inhibition because fixed arm connects up and down that fixed arm is made up and down both sides; Ellipse is all drawn, and this fashionable dress fixed arm transfers turnback to make the bifocal transposition can draw in the future the part completion.

A summit with rhombus during use is fixed on a certain fixed point in the flat circle, and a week is moved along this circumference in relative summit, at this moment the radius in the center of circle and the rotation that rhombus summit on the circumference is connected, with the movement locus of the formed intersection point of diagonal in addition two summits of rhombus in the distortion be an ellipse, its principle is characteristics of having utilized rhombus to be out of shape, and from the character of rhombus can prove radius and intersection of diagonal to the center of circle and to the rhombus fixed vertices equal this radius of a circle apart from sum, this is just meeting a moving point to two fixed points is that the ellipse of certain value defines apart from sum.

Claims

1, a kind of ellipsograph, it includes fixed arm, rocking arm, water chestnut arm, conversion arm, fixed axis, with lockly decides the connecting axle of bolt, the connecting axle of dress conversion arm, sliding axle and nib, press handle, rocking handle, bumper pad, pilot pin is characterized in that:

A, fixed arm are L type flat bar, and minor face is following, and long limit is last, and the minor face front end is equipped with fixed axis, and the bar shaped dead slot is left on the long limit of flat bar, the connecting axle of deciding bolt with lock is housed, from the initial length scale that is carved with of fixed axis correspondence position in groove;

B, rocking arm are flat bar, and the one end is fixed on the fixed axis, and the other end is equipped with rocking handle, and rocking arm is left the bar shaped dead slot, and the connecting axle of deciding bolt with lock is housed in dead slot, and the rocking arm flat bar is carved with the length scale on the left side;

C, water chestnut arm are the rhombus framework that four water chestnut arms are formed, and its four ends circular hole is connected with the connecting axle that the conversion arm is housed with the connecting axle of deciding bolt with lock, between two connecting axles the conversion arm is housed;

D, conversion arm are flat bar, and total length has dead slot, and two connecting axles that the conversion arm is housed slide in groove, sliding axle is installed in the dead slot of the intersection of conversion arm and rocking arm and is fixed on nib under the axle.

2, a kind of ellipsograph according to claim 1 is characterized in that below the fixed arm minor face bumper pad being housed, and on the long limit of minor face centre press handle is housed.

3, a kind of ellipsograph according to claim 1 is characterized in that two outsides of each arm are provided with the axle shelves, the connecting axle of deciding bolt with lock, and machining screw on the axle beyond the axle shelves, fixed axis and the connecting axle of deciding bolt with lock insert pilot pin at the axle center.