MULTIPURPOSE DRAWING PLATE

Technical Field

The present invention relates to a drawing instrument which is used for a drawing work, and more particularly to a multipurpose drawing plate in which rulers, compasses and protractors are integrally formed, to thereby simultaneously measure angles and lengths as well as easily draw circles and polygons, and to thus make it convenient to keep carriage and storage to accordingly increase convenience of use.

Background Art

In general, drawing instruments include compasses, protractors, and rulers. Conventional drawing instruments can perform one function, respectively. That is, compasses are used only to draw circles, protractors are used only to measure angles, and rulers are used to measure lengths and draw straight lines.

Therefore, the conventional drawing instruments have the following shortcomings.

In order to draw through the conventional drawing instruments, rulers, compasses, protractor etc., are separately or simultaneously used to measure or draw angles, lengths, etc., individually. Accordingly, it is very uncomfortable for users to measure physical quantities or draw physical shapes using the conventional drawing instruments. Further, it is very inconvenient for users to use the conventional drawing instruments in order to measure physical quantities or draw physical shapes.

In addition, since various types of drawing instruments including rulers,

compasses, protractor etc., should be individually used, and thus carried all together, it is very inconvenient for users to carry and keep them in custody.

Disclosure of the Invention To solve the above problems, it is an object of the present invention to provide a multipurpose drawing plate in which rulers, compasses and protractors are integrally formed, to thereby simultaneously measure angles and lengths as well as easily draw circles and polygons, and to thus make it convenient to keep carriage and storage to accordingly increase convenience of use.

It is another object of the present invention to provide a multipurpose drawing plate which can smoothly prevent the center of a circle from being seceded due to a slip of the central point of the circle when drawing the circle.

It is still another object of the present invention to provide a multipurpose drawing plate which can make the central point of a circle easily specified when drawing the circle, so that the central point of the circle does not slip in order to smoothly draw the circle.

It is yet another object of the present invention to provide a multipurpose drawing plate which can draw the circumference of a circle conveniently but precisely when drawing the circle.

It is still yet another object of the present invention to provide a multipurpose drawing plate in which indication holes indicating calibrations are alternately disposed or are formed so as to be distinguished as even-numbered and odd-numbered calibrations, so that the indication holes indicating the calibrations are easily formed.

To accomplish the above objects of the present invention, according to an aspect of the present invention, there is provided a multipurpose drawing plate, comprising: a rectangular plate which is formed of a rectangular plate shape; a ruler scale portion in which calibrations are marked horizontally along the lower side on the upper surface of the rectangular plate; a protractor scale portion in which protractor calibrations of 180 degrees are marked semi-circularly at the upper portion of the ruler scale portion on the upper surface of the rectangular plate, and angle indication holes are formed on the rectangular plate in correspondence to the respective protractor scales; a plate rotating portion which is provided in the rectangular plate in correspondence to the lower-center of the protractor scale portion, so that the rectangular plate rotates around the lower-center of the protractor scale portion; and a radius scale portion- in which a number of. radius calibrations are marked. on the upper surface of the rectangular plate around the plate rotating portion, and radius indication holes are formed in the rectangular plate in correspondence to each radius scale.

Preferably but not necessarily, the plate rotating portion comprises '■ a rotating disc which is rotatably provided while penetrating the upper surface of the rectangular plate which corresponds to the lower-center of the protractor scale portion; a through-hole which is formed so as to be pierced up and down at the center of the rotating disc! and a handle member whose lower portion is fitted and inserted into the upper portion of the through-hole, and on the outer surface of which unevenness is formed.

Preferably but not necessarily, the rotating disc comprises a rubber plate which is attached on the lower surface of the rotating disc so that slither is

prevented at the time of rotation of the rectangular plate.

Preferably but not necessarily, the handle member comprises: a spiral hole which is formed at the lower-center of the handle portion; and a first pencil lead which is spirally separably combined with the spiral hole to thereby draw the center of a circle.

Preferably but not necessarily, the plate rotating portion further comprises an auxiliary drawing portion which is formed separably in the handle member and assembled with the radius indication holes, to thereby draw a circumference. Preferably but not necessarily, the auxiliary drawing portion comprises: an auxiliary handle member which is spirally combined with the lower end of the handle member through the lower end of the through-hole and on the outer surface of which unevenness is formed; a spiral coupling hole formed at the. lower-center of the auxiliary handle member; and a second pencil lead that is spirally combined with the spiral coupling hole, to thereby draw a circumference.

Preferably but not necessarily, the auxiliary drawing portion further comprises a storage groove which is formed on top of the auxiliary handle member so that the second pencil lead is kept in custody. Preferably but not necessarily, the auxiliary drawing portion further comprises a slip preventive plate which is attached on the lower surface of the auxiliary handle member.

Preferably but not necessarily, the protractor scale portion further comprises a vertical elongate hole which is formed in the rectangular plate corresponding to protractor calibrations of 90 degrees which are marked on the

upper surface of the rectangular plate.

Preferably but not necessarily, the protractor scale portion further comprises: a pair of horizontal elongate holes which are formed in the rectangular plate corresponding to protractor calibrations of 0 and 90 degrees which are marked on the upper surface of the rectangular plate; and an arc-shaped elongate hole which is semi circularly formed around the plate rotating portion at the inner sides of the horizontality elongate holes.

Preferably but not necessarily, the protractor scale portion further comprises: a horizontal scale portion in which calibrations are marked horizontally on the upper surface of the rectangular plate along the upper end of the horizontal elongate holes.

Preferably but not necessarily, the angle indication holes are positioned alternately up and down. - . .. . . ..

Preferably but not necessarily, the radius indication holes are formed so as to be mutually distinguished in correspondence to even-numbered calibrations and odd-numbered calibrations.

Preferably but not necessarily, the radius indication holes are formed at equal intervals with respect to the number of plural calibration lines in which radius calibrations are indicated.

Brief Description of the Drawings

The above and other objects and advantages of the present invention will become more apparent by describing the preferred embodiments thereof in detail with reference to the accompanying drawings in which: FIG. 1 is a perspective view schematically showing a multipurpose

drawing plate according to an embodiment of the present invention;

FIG. 2 is a plan view of FIG. 1;

FIG. 3 is a bottom view of FIG. 1;

FIG. 4 is a side cross-sectional view of essential elements of the multipurpose drawing plate of FIG. 1;

FIG. 5 is a disassembled perspective view of the essential elements of the multipurpose drawing plate of FIG. 1;

FIG. 6 is a side cross-sectional view showing a state of use of essential elements of the multipurpose drawing plate of FIG. 1; and FIG. 7 is a side cross-sectional view showing another state of use of essential elements of the multipurpose drawing plate of FIG. 1.

Best Mode for Carrying out the Invention

The above and/or other objects and/or advantages of the present invention will become more apparent by the following description.

Hereinbelow, a multipurpose drawing plate according to an embodiment of the present invention will be described with reference to the accompanying drawing.

FIG. 1 is a perspective view schematically showing a multipurpose drawing plate according to an embodiment of the present invention. FIG. 2 is a plan view of FIG. 1. FIG. 3 is a bottom view of FIG. 1.

As shown in FIGS. 1 to 3, the multipurpose drawing plate includes: a rectangular plate 10 which is formed of a rectangular plate shape; a ruler scale portion 20 in which calibrations are marked on the rectangular plate 10; a protractor scale portion 30 in which protractor calibrations are marked on the

rectangular plate 10; a plate rotating portion which is provided in the lower-center of the protractor scale portion 30; and a radius scale portion 50 in which a number of radius calibrations are marked on the rectangular plate 10 around the plate rotating portion 40. The rectangular plate 10 is rectangularly formed lengthily left and right and is formed of a plastic or metal quality of a material so that calibrations are printed and indicated on the upper surface of the rectangular plate 10.

In the ruler scale portion 20, calibrations are marked horizontally along the lower side on the upper surface of the rectangular plate 10. Accordingly, the ruler scale portion 20 enables a user to draw a linear line or measure a length.

In the protractor scale portion 30, protractor calibrations of 180 degrees are marked semi-circularly at the upper portion of the ruler scale portion 20 on the upper surface of the rectangular plate 10, and angle indication holes 31 are formed on the rectangular plate 10 in correspondence to the respective protractor scales.

The protractor scale portion 30 enables a user to measure an angle, or indicates an angle on paper with a pencil through the angle indication holes 31.

It is desirable that the angle indication holes 31 are positioned alternately mutually up and down. The reason why the angle indication holes 31 are positioned alternately mutually up and down is to easily form a number of the angle indication holes 31 on the rectangular plate 10 in correspondence to the angular calibrations.

The protractor scale portion 30 further comprises: a vertical elongate hole 32 which is formed in the rectangular plate 10 corresponding to protractor

calibrations of 90 degrees which are marked on the upper surface of the rectangular plate 10; a pair of horizontal elongate holes 33 which are formed in the rectangular plate 10 corresponding to protractor calibrations of 0 and 90 degrees which are marked on the upper surface of the rectangular plate 10; and an arc-shaped elongate hole 34 which is semi circularly formed around the plate rotating portion 40 at the inner sides of the horizontality elongate holes 33.

The vertical elongate hole 32 enables a user to draw an angle equivalent to 90 degrees vertically on paper, and the horizontal elongate hole 33 enables a user to draw an angle equivalent to 0 and 180 degrees horizontally on paper. The horizontal elongate hole 33 further comprises a horizontal scale portion 35 in which calibrations are marked horizontally on the upper surface of the rectangular plate 10 along the upper end of the horizontal elongate holes 33. The horizontal scale portion 35 enables a user to confirm length of a straight line which is drawn through the horizontal elongate hole 33, and thus to easily draw a polygon having sides of a certain length through the horizontal elongate hole 33. The arc elongate hole 34 enables a user to draw a circular arc, and simultaneously to make vertex of a polygon located at the center of a plate rotating portion 40, so that an inner angle of the polygon can be measured centering this. The plate rotating portion 40 is formed in the rectangular plate 10 in correspondence to the lower-center of the protractor scale portion 30. The rectangular plate 10 can be rotated by a user around the lower-center of the protractor scale portion 30.

The radius scale portion 50 is configured to have a number of radius calibrations on the upper surface of the rectangular plate 10 centered on the

plate rotating portion 40. The radius indication holes are formed on the rectangular plate 10 in correspondence to each radius calibration.

After a user has chosen a radius through radius calibrations, and has rotated the rectangular plate 10 around the plate rotating portion 40, the radius scale portion 50 enables a user to draw a circumference on paper through the radius indication holes 51 corresponding to the chosen radius.

It is desirable that the radius indication holes 51 are formed so as to be mutually distinguished in correspondence to the even-numbered and odd-numbered calibrations. That is, it is desirable that radius indication holes 51 are formed only at the even-numbered calibrations along one line, and radius indication holes 51 are formed only at the odd-numbered calibrations along another line, so as to be mutually distinguished. This is to easily form a number of radius, indication holes 51 corresponding to each calibration in the rectangular, plate 10. Moreover, it is desirable that the radius indication holes 51 are indicated at even-numbered or odd-numbered calibrations, and are formed at the same intervals as the number of plural calibration lines in which radius calibrations are indicated. For example, as illustrated, in the case that the radius scale portion 50 is indicated as four calibration lines around the plate rotating portion 40, radius indication holes 51 are formed at even-numbered along one calibration line, and radius indication holes 51 are formed at odd-numbered along another calibration line. Accordingly, radius indication holes 51 are formed at two odd-numbered or even-numbered calibrations in the four calibration lines.

In addition, in the case that the number of calibration lines is four, an interval between the radius indication holes 51 is formed in correspondence to

four calibrations.

FIG. 4 is a side cross-sectional view of essential elements of the multipurpose drawing plate of FIG. 1, and FIG. 5 is a disassembled perspective view of the essential elements of the multipurpose drawing plate of FIG. 1. As shown in FIGS. 4 and 5, the plate rotating portion 40 includes: a rotating disc 41 which is rotatably provided while penetrating the upper surface of the rectangular plate 10 which corresponds to the lower-center of the protractor scale portion 30; a through-hole 42 which is formed so as to be pierced up and down at the center of the rotating disc 41; and a handle member 43 whose lower portion is fitted and inserted into the upper portion of the through-hole 42, and on the outer surface of which unevenness is formed.

The rotating disc 41 is penetratively rotatably formed on the upper surface of the rectangular plate 10. The rectangular plate 10 is rotated at a state where the rotating disc 41 is fixed on paper, to accordingly enable a circle to be smoothly drawn. Flanges are formed in the upper and lower ends of the rotating disc 41 so that the rotating disc 41 does not secede from the rectangular plate 10.

The rotating disc 41 includes a rubber plate 411 which is attached on the lower surface of the rotating disc 41. When the rectangular plate 10 is rotated at a state that the rotating disc 41 has been supported on paper, the rubber plate

411 makes the lower surface of the rotating disc 41 is closely adhered on paper, to thereby prevent slip.

The through-hole 42 plays a role of providing a space where the handle member 43 is installed in the rotating disc 41, in which a user holds and presses the handle member 43 with fingers.

A user holds and presses the handle member 43 with fingers to thereby firmly fix the rotating disc 41 on paper. The handle member 43 includes: a spiral hole 431 which is formed at the lower-center of the handle portion 43; and a first pencil lead 432 which is spirally separably combined with the spiral hole 431 to thereby draw the center of a circle.

The first pencil lead 432 is spirally combined with the spiral hole 431, and is protrudingly mounted on the bottom of the handle member 43. When drawing a circle, the center of a circle is accurately supported by the lower surface of the rotating disc 41, and is easily indicated. The first pencil lead 432 may be replaced by a substitute such as a needle supporting the center of a circle.

The plate rotating portion 40 further includes an auxiliary drawing portion 44 which is formed separably in the handle member 43 and assembledwith the radius indication holes 51, to thereby draw a. circumference. The auxiliary drawing portion 44 is separated from the handle member 43 by a user and then assembled with the radius indication holes 51. Accordingly, the user can draw with a pencil along the lower surfaces of the radius indication holes 51.

The auxiliary drawing portion 44 includes: an auxiliary handle member

441 which is spirally combined with the lower end of the handle member 43 through the lower end of the through-hole 42 and on the outer surface of which unevenness is formed; a spiral coupling hole 442 formed at the lower-center of the auxiliary handle member 441; and a second pencil lead 443 that is spirally combined separably with the spiral coupling hole 442, to thereby draw a circumference.

A user holds the auxiliary handle member 441 with fingers in order to draw a circumference. The spiral coupling hole 442 makes the second pencil

lead 443 coupled with the lower surface of the auxiliary handle member 441 separated from the handle member 43. The second pencil lead 443 is fitted into the radius indication holes 51 at a state of being coupled with the lower surface of the auxiliary handle member 441, so that a circumference can be drawn on paper through the lower surface of the radius indication holes 51.

The auxiliary drawing portion 44 further includes a storage groove 444 formed on top of the auxiliary handle member 441. The storage groove 444 keeps the first pencil lead 432 and the second pencil lead 443 in custody.

The auxiliary drawing portion 44 further includes a slip preventive plate 445 which is attached on the lower surface of the auxiliary handle member 441. The slip preventive plate 445 is made of a rubber material, and makes the lower surface of the auxiliary handle member 441 closely attached on the upper surface of the rectangular, plate 10 when the auxiliary ..handle member 441 is ^' pressed on the upper surface of the rectangular plate 10 at a state where the second pencil lead 443 has been inserted into the radius indication hole 51, and thus smoothly prevents the auxiliary handle member 441 from slipping along the upper surface of the rectangular plate 10.

FIG. 6 is a side cross-sectional view showing a state of use of essential elements of the multipurpose drawing plate of FIG. 1. As shown in FIG. 6, in order to draw a circle, the auxiliary handle member

441 is first separated from the handle member 43, and then the second pencil lead 443 is combined with the lower surface of the auxiliary handle member 441. Then, the second pencil lead 443 is inserted into the radius indication hole 51 corresponding to a radius which a user intends to draw. At this state, a user holds the handle member 43 with fingers of one hand,

1

and presses it downwards to thus make the rotating disc 41 closely attached on the upper surface of paper. Then, the user holds the auxiliary handle member 441 with fingers of the other hand and rotates the rectangular plate 10 around the rotating disc 41. Accordingly, the second pencil lead 443 draws a circumference on the upper surface of paper.

Here, as the user presses the rotating disc 41, the rubber plate 411 that is attached to the lower surface of the rotating disc 41 is closely attached to the upper surface of the paper. Accordingly, slip is prevented, and thus the rotating disc 41 is firmly fixed at a state where the center of a circle is does not secede. As a result, the rectangular plate is stably rotated around the rotating disc 41, and a circumference is simply drawn through the second pencil lead 443.

Moreover, as the user presses the auxiliary handle member 441, the slip preventive plate.-445 is closely attached on the upper surface, of. the -rectangular, plate 10, to accordingly prevent the auxiliary handle member 441 from slipping. Meanwhile, in the case that there is no second pencil lead 443, another pencil lead is directly inserted into the radius indication hole 51 to then be protruded to the lower surface of the radius indication hole 51. Accordingly, a circumference can be drawn.

FIG. 7 is a side cross-sectional view showing another state of use of essential elements of the multipurpose drawing plate of FIG. 1.

As illustrated, in order to draw a circle, the auxiliary handle member 441 is separated from the handle member 43 first and then the first pencil lead 432 is combined with the lower surface of the handle member 43.

At this state, then the second pencil lead 443 is combined with the lower surface of the auxiliary handle member 441. Then, the second pencil lead 443

is inserted into the radius indication hole 51 corresponding to a radius which a user intends to draw.

At a state where the first pencil lead 432 and the second pencil lead 443 have been completely coupled as described above, a user holds the handle member 43 with fingers of one hand, and presses it downwards to thus make the first pencil lead 432 closely fixed on the upper surface of paper, to indicate the center of a circle. Then, the user holds the auxiliary handle member 441 with fingers of the other hand and rotates the rectangular plate 10 around the rotating disc 41. Accordingly, the second pencil lead 443 draws a circumference on the upper surface of paper.

Here, as the user presses the auxiliary handle member 441, the slip preventive plate 445 is closely attached to the upper surface of the rectangular plate 10, to thus prevent the auxiliary handle member 441 from slipping. . . . ...

Meanwhile, in the case that there is no second pencil lead 443, another pencil lead is directly inserted into the radius indication hole 51 to then be protruded to the lower surface of the radius indication hole 51. Accordingly, a circumference can be drawn.

The present invention provides a multipurpose drawing plate in which rulers, compasses and protractors are integrally formed, and thus provides an effect of simultaneously measuring angles and lengths as well as easily drawing circles and polygons, and making it convenient to keep carriage and storage to accordingly increase convenience of use.

The present invention provides an effect of smoothly preventing the center of a circle from being seceded due to a slip of the central point of the circle when drawing the circle.

The present invention provides an effect of making the central point of a circle easily specified when drawing the circle, so that the central point of the circle does not slip in order to smoothly draw the circle.

The present invention provides an effect of drawing the circumference of a circle conveniently but precisely when drawing the circle.

The present invention provides to provide a multipurpose drawing plate in which indication holes indicating calibrations are alternately disposed or are formed so as to be distinguished as even-numbered and odd-numbered calibrations, so that the indication holes indicating the calibrations are easily formed.

As described above, the present invention has been described with respect to particularly preferred embodiments. However, the present invention is not limited to the above embodiments, and it. is possible for one who has an ordinary skill in the art to make various modifications and variations, without departing off the spirit of the present invention. Thus, the protective scope of the present invention is not defined within the detailed description thereof but is defined by the claims to be described later and the technical spirit of the present invention.

Industrial Applicability

As described above, the present invention can be applied to a multipurpose drawing plate in which rulers, compasses and protractors are integrally formed, to thereby simultaneously measure angles and lengths as well as easily draw circles and polygons, and to thus make it convenient to keep carriage and storage to accordingly increase convenience of use.