JPH1035182A - Elliptical compass - Google Patents

Abstract

PROBLEM TO BE SOLVED: To bring a refill of a pencil into contact with a paper surface only when drawing an ellipse and use as a compass exclusively for the ellipse by drawing the ellipse while pressing the refill, separating the refill of the pencil from the paper surface, providing a hole for a pin on a crossroad and fixing the compass on the crossroad. SOLUTION: A refill 10K of a pencil is fitted on a refill fitting tool 10I and fixed by a screw 10J, and the mark of a support pin 6a is registered on the graduation of a bar 1a (half of [long diameter - short diameter] of ellipse), and the refill is fixed by a fixing screw. The graduation of a writing instrument 10a is registered with the graduation of a base 9 (half of short diameter of ecllipse) and fixed by the fixing screw, and the ellipse is drawn by press rotating handle knob 1. The pin is inserted into a pin hole Ba provided on a crossroad B of an elliptical compass, and a guide 7a is fixed on the crossing of the crossroads A and B (half of [long diameter - short diameter] of ellipse), and zero is set (half of short diameter of ellipse) to use the compass for drawing roundness exclusively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an ellipse compass for drawing an ellipse.

[0002]

2. Description of the Related Art There has been no conventional manual elliptical compass as described below. (1) Conventionally, after drawing an ellipse, the core (or crow mouth) of the pencil can be separated from the paper surface, and there is no compass dedicated to a perfect circle. (2) The crossroads A and B were made to have a three-dimensional intersection, and the functions were divided into a drive unit, a long warp, and a short warp, and none of the fulcrum pins could draw an ellipse without intersecting with another path of the crossroads. (3) There was no ellipse compass that changes the direction of the drawn ellipse in the method described in (2) above. (4) There was no elliptical compass that was easy to handle by adjusting the scale of the major axis of the ellipse from the top in the method described in (3) above. (5) The amount of the angle of the drawn ellipse (90 degrees = 1/4, 18
(0 degree = half circle), the position of the handle attached to the fulcrum pin 2 was changed by 90 degrees or 180 degrees, the drawing was smooth, and there was no elliptical compass that moved the pencil lead away from the paper surface by the force of the spring. (6) None of the elliptical compasses moved on a ruler with a shrinkage ratio corresponding to the angle of the cut ellipse. (7) There was no elliptical compass that used both the pencil lead and the crow mouth.

[0003]

The ellipse compass is (1) to make the lead of the pencil contact the paper surface only when drawing an ellipse and to make it a compass exclusively for a perfect circle. (2) Eliminate the fulcrum pin from traversing the path of another fulcrum pin, draw a true circle with the length for the major axis set to zero, and draw an ellipse close to a straight line with the length for the minor axis near zero. thing. (3) To be able to change the direction of the drawn ellipse as needed. (4) The scale for the major axis of the ellipse should be set at the top. (5) The amount of the angle of the ellipse to be drawn (half -180 degrees, 3/4
= 270 degrees), make it possible to draw the ellipse smoothly, and make sure that the pencil lead is separated from the paper when finished. (6) When drawing a three-dimensional drawing, make it easy to position the drawing with dimensions that match the cut ellipse. (7) The height of the tip of the pencil lead from the paper should be the same as the height of the crow mouth.

[0004]

In order to achieve the above object, the ellipse compass of the present invention is as follows: (1) When drawing an ellipse, hold it with a hand;
Using the power of the spring 2B, lift up when you have finished drawing,
The pencil lead was moved away from the paper. In order to fix the guide 7a at the intersection of the crossroads A and B, a hole B for a pin is provided in the crossroad B and fixed with the pin Ba. (2) The crossroads A and B through which the fulcrum pins 2 and 6 pass are three-dimensionally crossed, and a rod for a driving unit (handle knob 1 to a fulcrum pin 2), a long rod 5 and a short rod 9 In three steps, the fulcrum pin was prevented from crossing the crossroad path of another fulcrum pin. (3) The base that supports the part having the function of drawing an ellipse is made circular with the rotating wheel 12 so that it can be rotated inside the outer base 11. (4) Rod 8, guide 3, rod 5 for the major axis of the elliptical compass
Is provided above the rotating wheel 12. (5) An angle scale plate 2D provided with an angle scale 2E is provided on the fulcrum pin 2, a mark 3A is provided on the guide 3, and the position of the handle attached to the fulcrum pin 2 is 90 degrees (not shown, or 180 °), and a spring 2B and a spring receiver 2C are provided. (6) The legs of the elliptical compass can be moved through the rods 14A and 14 in which the ruler 14B is inserted so that the elliptical compass can move on the ruler 14B having a contraction rate that matches the cut ellipse angle. (7) An elliptical compass to which a crow's mouth with elastic feet shown in (a), (b) or (c) below can be attached so that the length of the legs of the elliptical compass can be adjusted. B, a telescopic foot composed of a foot 13D, a nut 13E, and a foot 13F. B, a telescopic foot composed of a foot 13G, a screw 13H, a cylinder 13I, and a foot 13J. C, a frame (table) formed by telescopic feet and rods 14 composed of feet 13G, screws 13H, cylinders 13I, toes 13K, and toes 13L, rods 14A provided with a ruler 14B, a table 15, and screws 13C. The combination of

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the drawings, an embodiment will be described with reference to the drawings. In FIG. 1, a line is drawn in an ellipse drawing method, and a circle, a small circle, and an end opposite to an intersection with an origin (a, i) are shown. , U, E), the X axis is B and the Y axis is A. FIG. 2 shows FIG.
(A, I, U, E) is replaced with (A, I, U, D). (A ~ I) is replaced by LA, (I ~ U) is replaced by L, L C is the minor axis, (L + L) is the major axis, and when L is small, the ellipse is close to a perfect circle, and when L is small, the ellipse is close to a line. When (D) is turned, (A) becomes (A) moves to the right, (c) draws an ellipse.

FIG. 3 and FIG. 4 show an embodiment of an elliptical combus utilizing the above principle. A handle knob 1, a rod 1a provided with a key groove 1B, a screw 1a, a fulcrum pin 2a, a guide 3a,
V-grooves (6 o) are provided (for facilitating the positioning of attaching the rod 9 to the fulcrum pin 6a), the fulcrum pin 6a, the fixing screw 6a, and the screw 6w (tip) instead of the sliding key Are engaged with the keyway of a rod 1a having a conical V-shaped keyway, a spring 2B (for lifting the writing implement 10a and separating the lead of the pencil from the paper), a guide 7a, and a keyway 9
A screw 9A for fixing the rod 9 provided with the B and the fulcrum pin (alternatively, it may be fixed by caulking or an adhesive), a writing instrument 10
A (not shown, a screw 10B having a conical tip and serving as a sliding key is provided), a fixing screw 10
A, a cross path B provided with a lead mounting tool 10I for attaching a pencil lead 10K, a tightening screw 10J, a cross path A and a hole B for a pin (for fixing a guide 7a with a pin B), and the like. Is an elliptical compass composed of feet 13 that support.

[0007] Handle knob 1 ~ fulcrum pin 6a is d ~
(A) The fulcrum pin 2a to the fulcrum pin 6a are (L) a to (b) The fulcrum pin 6a to the core attachment 10I are replaced by (L) a to c. When using, attach the pencil lead 10K to the core attachment 10I and fix it with the screw 10J.
A scale {half of the ellipse (major axis-minor axis) = L a} is aligned with the mark 6I of the fulcrum pin 6a and fixed with a fixing screw 6a. L u) Writing instrument 1
Align the scale of 0A, fix it with the fixing screw 10A and press and turn the handle knob 1 to draw an ellipse.

The embodiments shown in FIGS. 5 and 6 correspond to FIGS.
The pin 13a is inserted into the hole B for the pin provided in the crossroad B of the elliptical compass shown in (1), and the guide 7a is fixed at the intersection of the crossroads A and B, (LA) is set to zero, and L ( It is possible to use only a half of the minor axis of the ellipse) to make a compass for a perfect circle.

The embodiment shown in FIG. 7 and FIG.
B is a three-dimensional intersection, and the drive unit, the long diameter rod, the short diameter rod and 3
The fulcrum pin is divided into stages so that the fulcrum pin does not intersect with the path of the other fulcrum pins. Thus, the wobble of the writing implement 10 is prevented.

(1) Handle knob 1, screw 1A, fulcrum pin 2, screw 2A, guide 3, rod 4, rod 5 having a key groove 5B on both surfaces (for long diameter), screw 5A, fulcrum pin 6, fixing screws 6 _a, screw 6B is not shown that the conical tip instead of Suberiki, guide 7, rod 8, the rod 9 provided with a key groove 9B (short diameter contouring), screw 9Ramuda, writing instrument 1
0, a screw 10A (not shown), a screw 10B for a keyway 9B, which has the same function as the screw 6B, a spring 10F, a cylinder 10D to be pressed down, and a mounting tool 10G provided with a pin 10C for preventing removal, and a fixing screw 10E. Screw 10H for mounting fixture 10G slide (removing the screw portion at the tip and substituting the slide key corresponding to the key groove of core mounting tool 10I), core mounting tool 10I and screw 10J for tightening.
This is an elliptical compass composed of a portion having a function of drawing an ellipse, and a frame (stand) made up of bars 11a and 12a, legs 13, fixing screws 13A and screws 13B supporting the portions. Screws for fixing (1A, 2A, 5A, 9A, 13A, 13B)
Alternatively, an adhesive may be used, or it may be fixed by caulking.

In use, a lead attachment 10I to which a pencil lead 10K is attached is tightened with a screw 10J, and the scale of the fulcrum pin 6 is aligned with the scale (L) of the rod 5 and the screw 6
A, the scale of the writing implement 10 is aligned with the scale (L) of the rod 9 and fixed with the screw 10A, and the cylinder 10D with the screw 10E.
Is pressed down and tightened to fix it to the writing instrument 10 (even if it is fixed, the fixture 10G moves freely in the up and down direction), turn the handle knob 1 to draw it loose when finished, and tighten it so that it does not come down.

The embodiment shown in FIGS. 9 and 10 supports a portion having a function of drawing an ellipse shown in FIGS. 7 and 8 so that the direction of the ellipse can be tilted by a required angle, and the same. Rod 11a, rod 12a, foot 13, fixing screw 13A, 1
Instead of a frame (table) made of 3B, a base 11 and a foot 13 provided with a scale 11A, screws 11B for fixing, and a scale 12A
(The pitch shown in the figure is 30 degrees.) The rotating wheel 12 is provided with a holding screw 11C (the head of the screw 11C serves as a floating prevention metal 11E, and is loosened to rotate the rotating wheel 12 by a necessary angle. Tighten and fix the wheel 1
2, the lifting prevention metal 11E and the screw 11D can be omitted), the lifting prevention metal 11E and the screw 11D,
An elliptical compass configured by a support base 12C for supporting the rod 8 and a frame (table) made of screws 12B fixed to the rotating wheel 12, which can change the direction of an ellipse to be drawn.

When used, a pencil lead 10K is fixed to a lead fixing tool 10I with a fixing screw 10J, a fulcrum pin 6 is aligned with the scale (length of LA) of the rod 5, and a writing tool 10 is used.
Is adjusted to the scale (length of L) of the rod 9, the scale 12A (30-degree pitch in the figure) of the rotating wheel 12 is adjusted to the scale 11A of the base 11 and fixed with the screw 11C, and the cylinder 10D is pushed down by the screw 10E. After the handle knob 1 is turned to draw an ellipse, the screw 10E is loosened and raised upward, and tightened so that it does not come down.

The embodiment shown in FIG. 11 and FIG.
By providing the support 12C of the elliptical compass shown in FIG. 10 above the rotating wheel 12, the rod 8, the guide 3, the rod 5
Is located above the rotating wheel 12, so that when the scale of the fulcrum pin 6 is adjusted to the scale of the bar 5, the scale can be adjusted from above without putting a finger under the base 11, so that it is easy to adjust (combination of a perfect circle and an ellipse (egg Shape), half is an ellipse (L + L) and the other half is just a perfect circle and it is easy to match when L = 0.) Remove the screw 11D and the anti-lifting metal 11E that have a role (to loosen the screw 11C, turn the rotary wheel 12 to the required position and tighten it), and change the positions of the screws 10E and 10J to be attached to the writing implement 10 by 90 degrees. Elliptical compass.

FIG. 13 (part of the elliptical compass of the embodiment shown in FIG. 14) and the elliptical compass of the embodiment shown in FIG. 14 are similar to the elliptical compasses shown in FIGS. An elliptical compass having the functions of (2) and (3). (1) Set the direction of the handle attached to the fulcrum pin 2 to 9
0 degree (not shown, but if the angle is changed by 180 degrees, the writing implement 10
When the handle is turned, the guide 3 and the guide 7 can be moved lightly (smoothly) when the handle is turned instead of the handle knob 1, the fulcrum pins 2, 6 and the writing instrument 10. (When the steering wheel is turned, the force with which the guide 3 of the crossroad A and the guide 7 of the crossroad B pry together is lightened). (2) An angle scale 2D is provided, a mark 3A is provided on the guide 3, and a required drawing angle (60 degrees = 1/6, 180 degrees =
Half) can be drawn in accordance with the mark 3A of the guide 3 while looking at the angle scale 2D. (3) The writing implement 10 is lifted by providing the spring 2B and the spring receiver 2C so that the pencil lead 10K is separated from the paper surface.

The functions (1) and (2) can be provided to the elliptical compass shown in FIGS. The functions of the above (1), (2) and (3) are represented by the elliptical compass shown in FIGS. 7 and 8, the elliptical compass shown in FIGS.
The elliptical compass shown in FIGS. 11 and 12 can be provided.

FIGS. 15 and 16 (sectional views taken along the line AA in FIG. 15).
In the embodiment shown in FIG. 7, the foot 13 is made into a foot 13A and a foot 13B at the lower part of the foot of the elliptical compass, and the rod 14 and the ruler 14B having a contraction rate 14B adapted to the cut elliptical angle can be replaced. , A frame (table) ruler 14 composed of a mounting bracket 16 having a screw hole 16 </ b> A (for mounting on a drafting machine, or omitting the mounting bracket 16 and being able to be used alone without being combined with a drafting machine).
This is a movable elliptical compass that moves on B and is fixed at required positions with screws 13C.

The elliptical compass shown in FIGS. 3 and 4, the elliptical compass shown in FIGS. 7 and 8, the elliptical compass shown in FIGS. 9 and 10, the elliptical compass shown in FIGS. 11 and 12, FIGS. 14 can be combined with the elliptical compass.

FIGS. 17 and 18 show a part of the lower part of the foot of the elliptical compass. The elliptical compass shown in FIGS. 13 and 4 (including the compass dedicated to a perfect circle shown in FIGS. 5 and 6) and FIG. ,
The elliptical compass shown in FIG. 8, the elliptical compass shown in FIGS. 9 and 10, the elliptical compass shown in FIGS. 11 and 12, and the elliptical compass shown in FIGS. An elliptical compass provided with (a) and (b) telescopic feet as shown below so that the height of the pencil lead from the crow and the tip of the crow's mouth are the same. (A) A foot 13C (a foot to which the toe 13E can be attached), a telescopic foot composed of a nut 13D and a toe 13E. (B) Foot 13 d (a foot to which the foot 13 H can be attached), screw 13 F, tube 13 G (the tube 13 G may be omitted) and foot 13 J (a groove in which the screw 13 F is fitted may be eliminated) Telescopic feet composed of.

FIG. 19 shows a part of the foot of the lower part of the foot of the elliptical compass. The foot 13 is capable of adjusting the length of the foot (the foot to which the foot 13K and the foot 13L can be attached). A screw 13I, a tube 13J (the tube 13J may be omitted), an extensible foot and a rod 14 composed of a toe 13K and a toe 13L, a rod 14A provided with a ruler 14B having a shrinkage rate according to the cut elliptic angle, a screw 13C, a movable elliptical compass to which a crow mouth is attached, which is composed of a frame (table) composed of a table 15. The core attachment 10I is removed from the attachment 10G of the elliptical compass, and a crow mouth is attached. 3 and 4
In the elliptical compass shown in FIGS. 5 and 6, the lead attachment 101 is removed from the writing implement 10A, and the crow's mouth is attached.

[0021]

The elliptical compass of the present invention is as follows: (1) With the elliptical compass shown in FIGS. 3, 4, 5, and 6, when the drawing is completed, the lead of the pencil or the crow mouth is lifted by the force of the spring 2B. Remove the fulcrum pin 2a and guide 7
A can be fixed at the intersection of the crossroads A and B with the pins B to provide a compass dedicated to a perfect circle.

(2) The fulcrum pin is formed in a three-dimensional intersection so that it does not pass through the crossroads (passage) of another fulcrum pin, and is composed of a driving unit rod, a long diameter rod, and a short diameter rod. , A perfect circle can be drawn with the length for the major axis (L = 0), and an ellipse close to a straight line can be drawn when the length approaches the length for the minor axis (L = 0).

(3) A frame (table) for supporting a part having a function of drawing an ellipse is made circular, and a frame (table) for supporting the part is formed.
Because it rotates inside, it can be fixed at the required position and an ellipse with the required inclination can be drawn. (4) As shown in FIG. 11 and FIG.
Is provided on the upper side of the rotating wheel 12 so that the long rod 5
Is located above the rotating wheel 12, so that the scale of the fulcrum pin 6 can be easily adjusted to the scale of the rod 5.

(5) The elliptical compass shown in FIGS. 13 and 14 will be described. (A) An angle scale plate 2D provided with an angle scale 2E on the fulcrum pin 2 is provided.
Is provided on the guide 3 so that the amount drawn by the angle scale 2E and the mark 3A (90 degrees = 1/4, 180 degrees = half) can be understood. (B) When the handle provided on the fulcrum pin 2 is changed by 90 degrees, the force pressing the handle knob pushes the guide 3 forward, and the guide 7 is prying (the guide 7 moves in the axial direction of the rod 8). 7 and 8, the position to be provided is 180.
When the degree is changed, the force for pressing the handle knob is applied from the upper side of the writing implement 10, so that the balance force does not work between the fulcrum pin 2 and the rod 4. (c) A spring receiver 2C (spring 2B) shown in FIG. To prevent torsion), spring 2B
When the handle knob 1 is released after the oval is drawn, the writing implement 10 is lifted and the lead of the pencil is separated from the paper surface.

(6) Referring to FIG. 15, when drawing a three-dimensional view, a ruler 14B having a contraction rate corresponding to the cut ellipse angle.
(Replaced by a ruler corresponding to the angle of the cut ellipse) into the rod 14A, and draw an ellipse while moving by a necessary dimension. The mounting bracket 16 is for attaching the movable elliptical compass to the drafting machine. The mounting bracket 16 can be omitted and the movable elliptical compass can be used alone.

(7) The telescopic foot shown in FIG. 17, the telescopic foot shown in FIG. 18, and the telescopic foot shown in FIG. Remove the tool 10I and attach the crow mouth. In the elliptical compass shown in FIGS. 3 and 4 (including FIGS. 5 and 6), the lead attachment 10I is detached from the writing implement 10A and the crow mouth is attached.

[Brief description of the drawings]

FIG. 1 is a diagram in which a line is drawn on an ellipse drawing method, an intersection of a large circle, a small circle, and an origin is (A, I, U), and an end on the opposite side is a point.

FIG. 2 replaces the line in FIG. 1 with a bar and replaces each point (A, I, U,
(E) is replaced with (a, i, u, d).

FIG. 3 is a plan view of a partial cross section of an elliptical compass in which a crossroad A and a crossroad B are not a three-dimensional intersection.

FIG. 4 is a cutaway view of a partial cross section of an elliptical compass in which a crossroad A and a crossroad B are not a three-dimensional intersection.

FIG. 5 is a guide 7 of the elliptical compass shown in FIGS.
Crossroads A to A at pin B _§, part of an ellipse Konbasu you Konbasu fixed to a true circle only at the intersection of crossroads B is a plan view of a cross-section.

FIG. 6 is a front view of a partial cross section of an elliptical compass that is a compass dedicated to a perfect circle.

FIG. 7 is a front view of a partial cross section of an elliptical compass in which a crossroad A and a crossroad B are three-dimensionally crossed, and the rod is a driving rod, a long diameter rod, and a short diameter rod, and has three stages.

FIG. 8 is a front view of a partial cross section of an elliptical compass in which a crossroad is a three-dimensional intersection and a rod has three stages for a drive unit, a long diameter, and a short diameter.

FIG. 9 is a plan view of a partial cross section of an ellipse compass that can change the direction of an ellipse to be drawn.

FIG. 10 is a front view of a partial cross section of an ellipse compass that can change the direction of an ellipse to be drawn.

11 is a plan view of a partial cross section of an elliptical compass in which a support base 12C is provided above the rotating wheel 12 and the fulcrum pin 6 is adjusted to the scale of the rod 5 above the rotating wheel 12. FIG.

FIG. 12 is a front view of an elliptical compass in which a fulcrum pin can be adjusted to the scale of a bar 5 above the rotating wheel 12;

13 is a front view of the elliptical compass shown in FIG. 14, in which the position of a handle provided on the fulcrum pin 2 is changed by 90 degrees, an angle scale plate 2D is provided, and a guide 3 is provided with a mark 3A.

FIG. 14 is a front view of a partial cross section of an elliptical compass in which the position of a handle 1 provided on a fulcrum pin 2 is changed, an angle scale plate 2D is provided, a mark 3A is provided on a guide 3, and a spring 2 and a spring receiver 2C are provided. is there.

FIG. 15 is a front view of a partial cross section of an upper part of a foot of a movable elliptical compass.

16 is a sectional view taken along the line AA shown in FIG.

FIG. 17 is a front sectional view of a telescopic foot using a screw in a part of the foot of the elliptical compass.

FIG. 18 is a front sectional view of a part of the foot of the elliptical compass, which is constituted by a foot 13G, a screw 13H, a cylinder 13I, and a foot 13J.

FIG. 19 is a front view of a partial cross section of a lower portion of a foot provided with a telescopic leg of a movable elliptical compass.

[Explanation of symbols]

1 handle knob 1a rod 1a screw
1A screw 1B key groove 2 fulcrum pin 2a fulcrum pin 2A screw 2B spring 2C spring support 2D angle scale plate 2E
Angle scale 3 Guide 3A Guide 3A Mark 4 Rod 5 Rod 5A Screw 5B Key groove 6 Pin for fulcrum 6A Pin for fulcrum 6 A Screw 6 U Screw 6 D Mark 6 O V groove 6 A Screw 6 B Screw 7 Guide 7 A Guide 8 Rod 9 Rod 9A Screw 9B Keyway 10 Writing implement 10A Writing implement 10A Screw 10B Screw 10C Pin 10D Pin 10D Screw 10E Screw
10F Spring 10G Attachment 10H Screw 10I
Core attachment 10J Screw 10K Pencil core 11 units 11a rod 11A scale
11B screw 11C screw 11D screw 11E Lift prevention metal 12 Rotating wheel 12A Rod 12A Scale
12B screw 12C support base 13 foot 13a foot 13a foot 13u foot 13e foot 13o foot 13A screw 13B screw
13C Screw 13D Nut 13E Toe 13F Screw 13G Tube 13H Toe 13I Screw 13J Tube
13K Toe 13L Toe 14 Rod 14A Rod 14B Ruler 15 Units 16 Mounting Bracket 16A Screw Hole A Crossroad B Crossroad B Apin B
B Hole for pin H Clearance

Claims (7)

[Claims] 1. A single line is drawn through the ellipse drawing, and points that intersect the great circle, small circle, and center point are (a), (i),
(U), the other end point (E), X axis (B), Y axis A
If this is replaced with (A), (A), (C), and (D), and the length of the ellipse is (L), the length of the ellipse is (L), the major axis of the ellipse is (L) ) + (L a), the minor axis becomes (L c), and when the points (a) and (b) are moved on the crossroads (Λ) and (B), the fulcrum (c) draws an ellipse. The handle knob (1), a rod (1A) provided with a keyway (1B), a screw (1A), a fulcrum pin (2A), a spring (2B), a guide (3A), V A fulcrum pin (6a) provided with a groove (6o), a screw (6a), a screw (6c), a guide (7a), a rod (9) provided with a key groove (9B), and a screw (9)
A), a writing instrument (10A), a screw (10A), a core attachment (10I), a screw (10J), a crossroad (A), a pin (B) and a crossroad provided with a pin hole (B). B) and a foot (13), 1. Turn the handle 1, the fulcrum pin (2a) passes through the crossroads Λ, the fulcrum pin (6a) passes through the crossroads (B), and the core attachment ( Make the pencil lead (10K) attached to 10I) draw an ellipse, and release the handle knob (1).
A) was lifted by the spring (2B). 2. Loosen the screw (1a), remove the fulcrum pin (2a) from the rod (1a), and connect the guide (7a) to the crossroad (A).
When the user moves to the intersection (B) and inserts and fixes the pin (B) in the pin hole (B), it has a compass function of drawing a perfect circle. This is an elliptical compass having the above functions 1 and 2. 2. The crossroads A and B are formed at a three-dimensional intersection, and the fulcrum (d) to the fulcrum (a) are connected to the handle knob (1) to the fulcrum pin (2), and the fulcrum (a) to the fulcrum (a) are fulcrum. (2) to fulcrum pin (6), fulcrum (a) to fulcrum (c)
Is replaced with a fulcrum pin (6) to a writing instrument (10), and the handle knob (1), screw (1A), fulcrum pin (2), screw (2A), guide (3), rod (4) ),
The rod (5) provided with the key groove (5B), the screw (5A), the fulcrum pin (6), the screw (6A), (6B), the guide (7), the rod (8), and the key groove (9B) The bar (9) provided,
Screw (9A), writing instrument (10), screw ゛ (10A),
(10B), pin (10C), cylinder (10D), screw (1
0E), spring (10F), fixture (10G), screw (10H), core fixture (10I), screw (10J)
And a frame (table) composed of bars ( _11a ), (12a), feet (13), screws (13A), and (13B) for supporting the ellipse and having a function of drawing an ellipse. ) And an elliptical compass composed of: 3. An elliptical compass bar (11a), (12
B) A frame (table) composed of feet (13), screws (13A) and (13B), a table (11) provided with a scale (11A),
Frame (table) composed of screws (11B), (11C), (11D), anti-lifting metal (11E), rotating wheel (12) provided with scale (12A), screw (12B), and support base (12C) 3.) The ellipse compass according to claim 2, wherein the direction of the ellipse can be changed. 4. A support (12C) for an elliptical compass is mounted on the upper side of a rotating wheel (12), and a guide (3) is attached to a rod (8).
4. The elliptical compass according to claim 3, wherein the screw (11D) and the anti-lifting metal (11E) are removed so that the guide (7) passes through the rod (4). 5. An oval compass is provided with a spring (2B) and a spring receiver (2C) so that the writing instrument (10) can be lifted.
An angle scale plate (2D) provided with an angle scale (2E) is provided on the fulcrum pin (2), and a mark (3A) is provided on the guide (3) so that the angle of the drawn amount can be understood. 2)
5. The elliptical compass according to claim 2, wherein the guide attached to the guide is changed so that the guide is easily moved to draw an ellipse. 6. An elliptical compass foot (13) with a rod (14)
And a measure of the shrinkage rate according to the cut ellipse angle (14B)
(14A), stand (1
3. A foot (13A) and a foot (13B) adapted to be combined with a frame (table) with a ruler (14B) made of 5), and are moved as necessary and fixed with screws (13C). The movable elliptical compass according to 3, 4, or 5. 7. An elliptical compass having a telescopic foot constituted by the following (a) or (b), wherein the length of the foot (13) of the elliptical compass can be adjusted so that the crow's mouth can be attached to the elliptical compass. An elliptical compass according to 2, 3, 4, or 5. A, foot (13D), nut (13E), toe (13F)
Telescopic feet composed of. B, a telescopic foot composed of a foot (13G), a screw (13H), a cylinder (3I), and a toe (13J). Foot (13) so that the length of the foot of the elliptical compass can be adjusted
G), screw (13H), cylinder (131), toe (3K),
The elliptical compass according to claim 6, wherein the compass has an elastic foot configured with a toe (13L).