CN2272374Y

CN2272374Y - Ellipse compasses

Info

Publication number: CN2272374Y
Application number: CN 96212929
Authority: CN
Inventors: 王世胜
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-05-18
Filing date: 1996-05-18
Publication date: 1998-01-14
Anticipated expiration: 2006-05-18

Abstract

The utility model relates to ellipse compasses which are a special tool for conveniently and accurately drawing ellipses. The plotting of the ellipse is realized by controlling the motion trajectory of the 1/2 point of long and short shafts of the required ellipse by a 'cross-shaped guide rail'. The utility model is characterized in that a cross-shaped flat plate (drawing frame) having a cross-shaped hole is supported and hung. Two screw bolts respectively penetrate through sliding blocks arranged in longitudinal and transversal holes of the cross-shaped hole of the drawing frame. The upper end is connected with an operation hand lever, the lower end is connected and tightly locked (the locking points are respectively 1/2 of the long and short shafts of the required ellipse) with a long shape flat plate (drawing arm) having a long strip hole, and the drawing arm is suspended below the drawing frame in parallel. The drawing arm can be freely rotated in the controlled range of the cross-shaped hole of the drawing frame, and the operation trajectory of the drawing pen driven by the drawing arm is the ellipse.

Description

Ellipsograph

The utility model relates to a kind of oval specific purpose tool of drawing.

At present, the known method of drawing ellipse of people has: four hearts circle practice of the oval concentric circles practice, ellipse etc. all exist and draw inconvenient or coarse shortcoming.(not knowing whether to have other to draw oval specific purpose tool in person)

The utility model provides a kind of ellipsograph, is exclusively used in to draw ellipse, and it is not only drawn conveniently, and accurately.

The purpose of this utility model be achieved in that utilize supporting leg cross bore to be arranged with one (cross bore is required oval long as drawing, the motion guide rail that minor axis is 1/2) cross flat board (as painting frame) supports unsettled, utilize two bolts respectively by painting the vertical of frame cross bore, slide block in the transverse holes, the upper end is connected with operating grip, lower end and one has the strip flat board (as painting arm) of elongated hole to be connected locking, and (it is required oval long that locking point is respectively, minor axis 1/2 point), make and paint parallel being suspended in of arm and paint frame below, and the rotation that can in the scope of the cross bore control of painting arm, freely swing.The geometrical principle of its institute's foundation is: oval and oval long and short axis is the Changing Pattern between vertical " cross hairs " that constitutes mutually, its Changing Pattern is embodied in: being more arbitrarily the center of circle on the ellipse, with ellipse short shaft 1/2 is that radius is made an arc, make it to intersect with transverse, connect and prolongation at 2, extended line and ellipse short shaft are intersected, and the distance between the point of joining to the ellipse must be 1/2 of a transverse.Changing Pattern as can be known thus: control the long and short axle of required ellipse 1/2 point, it is moved on ellipse weak point, long axis respectively, can find out oval all points of.

Owing to adopted such scheme, overcome inconvenience, inaccuracy when drawing ellipse.Only adopted the cross guide rail to control the running orbit of 1/2 on the long and short axle of required ellipse in this programme, simple in structure.

Below in conjunction with drawings and Examples the utility model is further specified.Among the figure 1, paint frame 2 and paint arm (paint arm bottom surface have scale invisible in the drawings) 3, cruciform vent guide rail 4, supporting leg 5, paint pen card 6, handle 7, slide block 8, handle 9, slide block

In the accompanying drawings, supporting leg (4) will be painted frame (1) and support unsettled, two bolts (invisible in the accompanying drawings) are passed through slide block (7) respectively, (9), upper end and handle (6), (8) connect, the lower end with paint arm (2) and be connected locking, (it is required oval long that this locking point is respectively, minor axis 1/2 point) makes and paint the parallel below of painting frame (1) that is suspended in of arm (2), when driving handle (6), (8) drive slide block (7), (9) and when painting arm (2), make slide block (7), (9) respectively at the horizontal stroke of the cross bore slideway (3) of painting frame (1), when vertically sliding in the hole, the running orbit of painting pen card (5) (below card have paint pen) of painting arm (2) one ends promptly is an ellipse.Regulating handle (6), (8) and paint pen card (5) at the locked position of painting on the arm (2) can be drawn required ellipse and will be painted pen card (5) and transfer between handle (6), (8), can draw small ellipse.

Claims

1, a kind of ellipsograph, it is characterized in that: have the cross flat board (painting frame) of cruciform vent guide rail to support unsettled one, utilize two bolts respectively by the slide block in the vertical, horizontal hole of painting the frame cross bore, the upper end is connected with operating grip, lower end and one has the strip flat board (painting arm) in strip hole to be connected locking, make and paint parallel being suspended in of arm and paint frame below, and the rotation that can in the scope of painting the control of frame cross bore guide rail, freely swing.