CN2310682Y

CN2310682Y - Parabola gauge

Info

Publication number: CN2310682Y
Application number: CN 97248321
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 a teaching aid, especially an instrument that can draw the parabola specially is equipped with linear slide rail at the fixed arm top that can fix in the drawing, the flexible rhombus frame that vertically installation cursor slide on the slide rail, four rhombus arms that play the connection effect are connected with the connecting axle, at the connecting axle facial make-up transform arm on the relative summit of rhombus frame, at transform arm and the crossing department dress slide shaft of slide arm, the nib of drawing is adorned to the slide shaft below. The utility model discloses simple structure, low in cost, convenient operation, it is efficient, be fit for teacher, student and use.

Description

Para-curve gauge

The utility model belongs to a kind of teaching aid, especially a kind ofly can draw parabolical instrument specially.

There is not to draw directly, fast and accurately according to given directrix and focus the instrument of parabola figure at present.

The purpose of this utility model is to provide a kind of para-curve gauge that can draw the parabola figure directly, fast and accurately.

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

It includes fixed arm, cursor slide, water chestnut arm, conversion arm the utility model, slide rail, and fixed connection shaft locks connecting axle, the connecting axle of conversion arm is housed, sliding axle and nib, press handle, sliding handle, bumper pad, pilot pin.Fixed arm be flat L shaped, minor face is following, long limit is last, on front, long limit, be carved with the length scale, have dead slot on the arm, the locking connecting axle is installed in the dead slot, minor face front end dress is perpendicular to the bar shaped slide rail of fixed arm, slide rail is double-deck, and the cursor slide that the upper strata has dead slot T font inserts in the slide rail dead slot with two sliding handles, and cursor slide one end is equipped with fixed connection shaft from the initial dead slot that has of connecting axle, the water chestnut arm is that the circular hole of its four end of bar shaped is linked to be the rhombus framework with connecting axle, the conversion arm is housed between two connecting axles, and conversion arm total length has dead slot, in the dead slot sliding axle is housed between conversion arm and cursor slide intersection two arms.

The utility model is simple in structure, and is cheap, easy to operate, and high efficiency can be made into the accurate drawing instrument of different size, is fit to teaching, engineering design, student and uses.

Accompanying drawing is a structural perspective of the present utility model.

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

It includes fixed arm 1, cursor slide 2, water chestnut arm 3, conversion arm 4 the utility model, slide rail 5, and fixed connection shaft 6 locks connecting axle 7, the connecting axle 8 of conversion arm is housed, sliding axle and nib 9, press handle 10, sliding handle 11, bumper pad 12, pilot pin 13.Fixed arm be flat L shaped, the right side turn 90 degrees fell, minor face is following, long limit is carved with the length scale last on front, long limit, have dead slot on the arm, locking connecting axle 7 is installed in the dead slot, and slide in groove, lock on arbitrary position, the length of locking connecting axle 7 positions is exactly that parabolic point is to the directrix distance.Dress bumper pad 12 below fixed arm 1 minor face, above the corresponding bumper pad 12 press handle 10 is housed, can press down by holding down handle by left hand, fixed arm is pressed solidly on drawing, minor face front end dress is perpendicular to the bar shaped slide rail 5 of fixed arm 1, slide rail 5 is double-deck, the upper strata has dead slot and two sliding handles of cursor slide 2 usefulness 11 of T font can be inserted in the sliding-rail groove, to keep cursor slide 2 and slide rail 5 vertical also slidably, cursor slide 2 tops are equipped with fixed connection shaft 6, all the other total lengths have dead slot, 3 bar shapeds of water chestnut arm only play the connection effect, the circular hole of its four end connecting axle 6,7,8 connect into the rhombus framework, conversion arm 4 is housed between two connecting axles 8, conversion arm total length has dead slot can make two connecting axles 8 slide therein, in the dead slot of conversion arm 4 and cursor slide intersection two arms, sliding axle 9 is housed, can in the dead slot of two arms, slide, nib is equipped with in sliding axle 9 lower ends, connecting axle 6,7,8 and sliding axle 9 rotate or the axle shelves are equipped with to guarantee the upright position and the flexibility of axle and arm in two outsides of each arm of sliding in clamping, the outside axle of axle shelves of fixed connection shaft 6 and locking connecting axle 7 is gone up machining screw and is locked in the groove of fixed arm so that be fixed by bolts to the axis hole neutralization at cursor slide top, and in the boring of the axle center of this diaxon to insert pilot pin 13 in order to determine the exact position of directrix and focus on the drawing, sliding axle 9 under axle center boring is the axle shelves outside spool on machining screw and axle is split into two halves, pen core penetrated in the hole and to use bolted, the below of two sliding handles 11 penetrates in the dead slot of the hole of cursor slide and slide rail becomes the axle that there are the axle shelves in two outsides, and the top is that handle can make on slide rail with right hand push-and-pull and slides.

The effective length of each arm of para-curve gauge (referring to remove the length of pushing with the sliding handle part) has certain proportion, because the parabola two ends infinitely prolong, to determine each arm lengths according to the size of paint part, the effective length of fixed arm is by the ultimate range decision of painting parabola focus to directrix, the water chestnut arm lengths is by the parabolical maximum focal radius decision of paint, and be not less than the effective length of fixed arm, the conversion arm lengths is not less than two times of water chestnut arm lengths, the effective length of cursor slide is not less than the length of water chestnut arm, and the effective length of slide rail is not less than two times of length of water chestnut arm.Can design the length dimension of each arm according to this.During use, make in the rectilinear motion cursor slide 2 when slip cursor slide 2 along slide rail 5 and affect the rhombus framework constantly to be out of shape and make 4 displacements of conversion arm, sliding axle 9 is subjected to cursor slide 2 and conversion arm 4 to promote to make the below nib to paint middle parabola simultaneously.Linear position when the rhombus framework connecting axle 6 that at this moment is fixed in cursor slide 2 tops slides is parabolical directrix, the position that is locked in the connecting axle 7 on the fixed arm 1 is a parabolic focus, on fixed arm 1 from being the distance of parabola focus to directrix corresponding to the position of directrix to the distance of the connecting axle 7 of this locking.Can draw the parabola figure directly, fast and accurately according to given focus and directrix.

Claims

1, a kind of para-curve gauge, it includes fixed arm, cursor slide, water chestnut arm, conversion arm, slide rail, fixed connection shaft locks connecting axle, and connecting axle, sliding axle and the nib of conversion arm is housed.Press handle, sliding handle, bumper pad, pilot pin.It is characterized in that:

A, fixed arm be flat L shaped, minor face is down, long limit is carved with the length scale last on front, long limit, have dead slot on the arm, the locking connecting axle is installed in the dead slot, minor face front end dress falls in the bar shaped slide rail of fixed arm;

B, slide rail are double-deck, and the cursor slide that the upper strata has dead slot T font inserts in the slide rail dead slot with two sliding handles, and cursor slide one end is equipped with fixed connection shaft from the initial dead slot that has of connecting axle;

C, water chestnut arm are that the circular hole of its four end of bar shaped is linked to be the rhombus framework with connecting axle, and the conversion arm is housed between two connecting axles;

D, conversion arm bore and have dead slot, in the dead slot sliding axle are housed between conversion arm and cursor slide intersection two arms.

2, a kind of para-curve gauge according to claim 1 is characterized in that adorning bumper pad below the fixed arm minor face, and press handle is housed above the corresponding bumper pad.

3, a kind of para-curve gauge according to claim 1 is characterized in that sliding axle holes in the axle center, and machining screw and axle is split into two halves on the axle under outside the axle shelves is to insert nib in the axle center hole and to use bolted.

4, a kind of para-curve gauge according to claim 1 is characterized in that the axle shelves are equipped with in two outsides of each arm of sliding, and the outside axle of axle shelves of fixed connection shaft and locking connecting axle is gone up machining screw, inserts pilot pin in the axle center hole of above-mentioned diaxon.