JP2006264157A - Compasses-cum-ruler - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable a circle and an arc to be simply and accurately drawn, without the need for separately carrying compasses, by adding a compass function to a ruler of high frequency in use. <P>SOLUTION: In this compasses-cum-ruler, a main body part 1, which is formed in a long ruler shape, comprises a through-hole 5 for inserting a lead tip of a writing instrument, and a rotational supporting point part 4. The main body part 1 can be used not only as the ruler but also as the compasses by being rotated on the point 4 in the state of making the lead tip of the writing instrument inserted into the through-hole 5. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a compass and ruler that can be used as a compass and a ruler.

  As a stationery, a ruler is used to draw a straight line, and a compass is used to draw a circle or an arc. Usually, there are many opportunities to draw a straight line when performing some writing work. Therefore, it is common to keep a ruler in a pen case together with a writing instrument such as a mechanical pencil or a ballpoint pen. On the other hand, there are relatively few opportunities to draw circles and arcs, and the compass occupies space for that, so the compass along with the writing instrument and ruler is often not always in the pen case. Therefore, if there is an opportunity to draw a circle or an arc, it will be handled by handwriting, but it is not easy to draw a circle or an arc accurately without using a tool.

On the other hand, a compass that can be made compact when not in use has also been proposed (see Patent Document 1). However, it is troublesome to provide a separate compass, and this does not solve the above problem. Absent.
JP-A-11-240293

  The present invention was invented in view of the above problems, and by adding a compass function to a ruler with high frequency of use, it is possible to draw a circle or an arc easily and accurately without having to carry a separate compass. The problem is to do so.

  In order to solve the above problems, the compass ruler according to the present invention includes a plurality of through-holes 5 for allowing the tip of a writing instrument to pass through a long ruler-shaped main body portion 1 and a rotation fulcrum portion 4. The distance between each through hole 5 and the rotation fulcrum portion 4 is different. By using the compass and ruler having the above configuration, the main body 1 can be used as a ruler. Of course, the center of the rotation fulcrum 4 is formed by inserting the tip of a writing instrument into one of a plurality of through holes 5 provided. By rotating the main body 1, it can be used as a compass. That is, if one of the above compass rulers is prepared, a circle or an arc can be drawn easily and accurately without having to carry a separate compass. Moreover, since the structure is compact, it is easy to carry and can be manufactured at low cost.

  Further, in the compass ruler having the above-described configuration, it is preferable to display the arc 8 having the radius of curvature as the distance between the rotation fulcrum part 4 and the through hole 5 on the main body 1 in correspondence with the through hole 5. . By displaying the arc 8 on the main body 1, the radius of curvature in the case where a circle or an arc is drawn by inserting the tip of the writing tool through the corresponding through hole 5 can be recognized in advance.

  In the compass ruler having the above-described configuration, it is preferable that the rotation hole 4 is provided with a mounting hole 6 in the main body 1 and a support member 7 is rotatably provided in the mounting hole 6. In this way, when used as a compass, the main body 1 can be smoothly rotated by moving the writing instrument inserted through the through hole 5 while pressing the support member 7 from above. .

  The support member 7 preferably has a central hole 7d. By doing in this way, when using as a compass, the main-body part 1 can be aligned, visually recognizing the location which becomes a rotation center through the center hole 7d provided in the support member 7.

  In the present invention, by adding a compass function to a ruler that is frequently used, it is possible to draw a circle or an arc easily and accurately without having to carry a separate compass.

  Hereinafter, the present invention will be described based on embodiments shown in the accompanying drawings. FIG. 1 shows an example of a compass ruler according to an embodiment of the present invention. Reference numeral 1 in the figure is a ruler-shaped main body portion that is long, and linear edges 2 are formed on both side portions extending in the long direction. Protrusions 3 that are the rotation fulcrum portions 4 of this example are provided at one end portion and the central portion in the longitudinal direction of the main body portion 1.

  Further, a plurality of through holes 5 are arranged in the main body 1 along the straight edges 2. The through-hole 5 is a small-diameter round hole for inserting a lead of a writing instrument such as a pencil, a mechanical pencil, a ballpoint pen, or a magic pen, and has a predetermined interval between the projection 3 at the end and the projection 3 at the center. A plurality of holes are continuously drilled at a distance from each other, and a plurality of holes are continuously spaced at a predetermined interval even in a direction away from the protrusion 3 at the center (rightward in the figure) from the protrusion 3 at the center. Have been drilled. Reference numeral 9 in the drawing is a circular hole formed in the end of the main body 1 opposite to the side on which the protrusion 3 is provided, and is formed to have a larger diameter than the through hole 5.

  By preparing one compass ruler having the above-described configuration, it can be used as a ruler and can be used as a compass when necessary. That is, in the case of drawing a straight line, with the projections 3 facing upward, as in the case of a general ruler, while holding the main body 1 by hand, the tip of the writing instrument is applied to the straight edge 2 and the straight edge The tip of the writing instrument may be moved linearly while sliding to 2. If it is necessary to draw a circle or an arc, turn over both the projections 3 of the main body 1 so that they face downward, and set one of the projections 3 at the center of the circle or arc to be drawn. The pen tip of the writing instrument is inserted through the penetrating hole 5 at an appropriate position in the penetrating hole 5 so that the lead tip protrudes downward from the through hole 5. In this state, when the writing instrument is moved while pressing the projection 3 set at the center from the upper surface side of the main body 1, the core of the writing instrument draws a circle or an arc around the projection 3, that is, the rotation fulcrum 4. .

  The radius of curvature of the circle or arc drawn here is the distance between the projection 3 set at the center and the through hole 5 through which the core of the writing instrument is inserted, so that the core is inserted into the projection 3. The radius of curvature can be freely set by appropriately selecting the through-hole 5 to be made. Further, depending on which one of the projection 3 at the end and the projection 3 at the center is set as the center, the operation range of the entire main body 1 when used as a compass can be selected as follows.

  When the projection 3 at the end is set as the center, the main body 1 as a whole rotates in a large operating range around the projection 3 when used as a compass. On the other hand, when the center projection 3 is set as the center, the entire main body 1 rotates around the projection 3 within a relatively small operating range. Therefore, when drawing a circle or arc having a relatively large radius of curvature, the end projection 3 is set as the center, and the through-hole 5 corresponding to this large radius of curvature (that is, from the central projection 3 in the drawing) One of the through holes 5 arranged in the right direction may be selected, and when a circle or arc having a relatively small radius of curvature is drawn, the center protrusion 3 is set as the center. A through hole 5 corresponding to the radius of curvature (that is, one of the through holes 5 arranged between the protrusion 3 at the end and the protrusion 3 at the center or from the protrusion 3 at the center to the right in the figure) One of the through holes 5 arranged in the direction may be selected.

  When it is desired to draw a circle or arc having a smaller diameter, the circular hole 9 formed in the end of the main body 1 is used, and the writing instrument is moved while keeping the tip of the inner edge of the circular hole 9 along the core. . Since a plurality of circular holes 9 are provided with different diameters, a plurality of types of circles or arcs can be drawn.

  In this example, the protrusion 3 is formed integrally with the main body 1, but the protrusion 3 may be detachable from the main body 1. In order to do this, for example, a pin hole may be formed in the main body 1 and a pin member having a protrusion 3 at the tip may be detachably attached to the pin hole. In the case where pin holes are formed in the end portion and the central portion of the main body 1, the pin member may be attached only to the pin hole on the side to be set in the center as necessary.

  Next, another example of the compass ruler in the embodiment of the present invention will be described with reference to FIG. 2, but the same reference numerals are given to the same configurations as the example, and detailed description thereof will be omitted. The compass ruler of this example forms a rotation fulcrum portion 4 in the vicinity of the zero portion of the scale provided on one straight edge 2 of the main body 1, and extends along the straight edge 2 from the rotation fulcrum portion 4. Through-holes 5 (hereinafter referred to as 5a) are arranged in rows at equal intervals of 1 cm. Each through-hole 5a is capable of drawing a circle or an arc around the rotation fulcrum 4 with the same radius of curvature as the number adjacent to the through-hole 5a among the numbers on the scale of the straight edge 2. .

  The rotation fulcrum portion 4 of this example is formed by an attachment hole 6 formed to have a larger diameter than the through hole 5 a and a ring-shaped support member 7 attached to the attachment hole 6. The support member 7 includes a cylindrical portion 7a that is rotatably fitted in the mounting hole 6, and a ring-shaped finger rest portion 7b that extends outward from a peripheral edge on one end side (upper side in the drawing) of the cylindrical body portion 7a. And a support leg portion 7c extending outward from the peripheral edge of the other end side (lower side in the figure) of the cylindrical body portion 7a. The main body portion 1 is formed by the finger rest portion 7b and the support leg portion 7c. The cylindrical body portion 7a, that is, the entire support member 7 is rotatably mounted in the mounting hole 6 in a sandwiched state. In addition, the outer surface of the finger rest 7b is formed in a convex curved surface, and the outer surface of the support leg 7c is formed in a flat surface.

  In the main body 1, an arc having a radius of curvature corresponding to the distance between the center of the through hole 5 a and the center of the rotation fulcrum 4 corresponding to each through hole 5 a arranged in a straight line along the straight edge 2. 8 are respectively displayed. The arc 8 is an arc line drawn around the rotation fulcrum portion 4 through the through holes 5a. Between the adjacent arcs 8, another through-hole 5 (hereinafter referred to as 5b) is arranged in a straight line inclined by a predetermined angle with respect to the straight edge 2. The through holes 5b are arranged so as to divide a plurality of portions between the through holes 5a arranged along the straight edge 2 and the arcs 8 passing over the through holes 5a adjacent to the through holes 5a. is there. In this example, through-holes 5b are arranged at locations that divide the arc 8 indicated by a radius of curvature in increments of 1 cm into five, and each through-hole 5b is a distance from the rotation fulcrum portion 4, that is, a radius of curvature. Are different structures in increments of 0.2 cm.

  If it is necessary to draw a circle or an arc using the compass ruler of this example, the support leg portion 7c side of the ring-shaped support member 7 forming the rotation fulcrum portion 4 of the main body portion 1 is directed downward. The center portion 1 of the circle or arc to be drawn on the paper surface is visually confirmed through the central hole 7d of the support member 7, and the main body portion 1 is positioned so that the central portion on the paper surface is located at the center of the central hole 7d of the support member 7. Install. In this state, the flat surface portion of the support leg portion 7c is pressed onto the paper surface by pressing the finger against the convex curved surface portion of the finger contact portion 7b of the support member 7 to fix the support member 7 on the paper surface. When the pen tip of the writing instrument is inserted and moved in an appropriate place in the through holes 5a and 5b formed in large numbers, the main body 1 rotates around the support member 7, that is, the rotation fulcrum part 4, and the writing instrument The tip of the circle will draw a circle or an arc.

  The circle or arc that can be drawn is centered on either the through-hole 5a arranged with a radius of curvature in 1 cm increments or the through-hole 5b arranged with a radius of curvature of 0.2 cm between adjacent through-holes 5a. It can be selected as appropriate depending on whether the tip is inserted or not, and a detailed radius of curvature in increments of 0.2 cm can be selected. In addition, the distance between the through holes 5a along the straight edge 2 is sufficiently secured, and the distance between the through holes 5b is also secured by inclining the arrangement of the through holes 5b with the straight edge 2 as described above. Therefore, the structure is such that the strength of the main body 1 is prevented from being lowered despite the large number of through holes 5a and 5b.

  The radius of curvature of the circle or arc to be drawn, that is, the selection of the through holes 5a and 5b to be inserted may be made with reference to the arc 8 displayed corresponding to each through hole 5a, and the main body 1 is transparent or translucent. If this is the case, it is more preferable because the arc 8 can be easily compared with the actual drawing line.

  The diameters of the through holes 5a and 5b may be determined according to the diameter of the tip of the writing instrument to be inserted. To do. All the through holes 5a and 5b do not have to have the same diameter, and by providing a plurality of types of diameters, it is possible to work using various writing tools.

  According to the compass and ruler of the above example and other examples, the ruler and the compass are integrated, so that it is convenient to carry and can be produced at low cost. In addition, it is possible to easily draw circles with various diameters without making holes in the paper as in a normal compass, and by providing various through holes 5 with various diameters such as magic pens. A writing instrument can be used.

It is a perspective view which shows the compass and ruler of an example in embodiment of this invention. The compass ruler of the other example in embodiment of this invention is shown, (a) is a perspective view, (b) is the sectional view on the AA line of (a).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main-body part 4 Rotation fulcrum part 5 Through-hole 6 Mounting hole 7 Support member 8 Arc

Claims (4)

  A long ruler-shaped main body is provided with a plurality of through-holes for inserting the core of the writing instrument and a rotation fulcrum, and the distance between each through-hole and the rotation fulcrum is different. Characteristic compass ruler.   2. The compass and ruler according to claim 1, wherein an arc having a radius of curvature of the distance between the rotation fulcrum and the through hole is displayed on the main body in correspondence with the through hole.   The compass ruler according to claim 1 or 2, wherein an attachment hole is formed in the main body portion as the rotation fulcrum portion, and a support member is rotatably provided in the attachment hole.   The compass ruler according to claim 3, wherein the support member has a central hole.

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