ruler

Abstract

To provide a ruler excellent in portability and suitable for drawing a perpendicular line and a parallel line to the perpendicular line.SOLUTION: When drawing perpendicular and parallel lines to a pedestal ruler 10, a recess 11 of the pedestal ruler 10 is fitted with a slide protrusion 23 of a perpendicular ruler 20, and while sliding the slide protrusion 23 in the recess 11 in the left-right direction in plan view, a line is drawn while bringing a writing instrument into contact with a separation side lower side 21a or a separation side upper side 21b of the perpendicular ruler 20, so that a perpendicular line to a pedestal lower side 13 and a pedestal upper side 15 of the pedestal ruler 10 can be accurately and easily drawn.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a ruler that is highly portable and suitable for drawing perpendicular lines and lines parallel to the perpendicular lines. [Background technology]

[0002] Conventionally, when drawing ruled lines to plot the axes of a table or graph, a set of triangular rulers or multiple straight rulers (hereinafter sometimes simply referred to as "rulers") is used, and one ruler is moved parallel to the other while being placed against it, and one or more perpendicular lines are drawn to the axis.

[0003] In this case, depending on the amount of force used by the user to hold the rulers, one of the rulers may shift position, resulting in an uneven line. Also, when drawing a line, the force applied to the tip of the ruler may cause the ruler to shift, resulting in a curved line that is no longer parallel.

[0004] Here, there is a drafting table (so-called drafter) that is specialized for drafting as a tool for drawing continuous perpendicular and parallel lines. By using this drafting table, it is possible to easily draw continuous perpendicular and parallel lines, but the drafting table is not commonly available, and it is very large and not very portable, as it has units with functions such as a T-square, a gradient ruler, and a scale ruler attached to the drafting board by an arm.

[0005] Furthermore, there is a set square that allows the set squares to slide while maintaining contact with each other without having to be pressed down by hand, improving operability and maintaining contact even when positioning, ensuring that parallel lines can be drawn (for example, Patent Document 1). [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2009-166395 Summary of the Invention [Problem to be solved by the invention]

[0007] The rulers exemplified above, due to the large width (area) of each set square, may not fit into a standard writing implement case, making them less portable. Furthermore, when attempting to draw consecutive perpendicular lines parallel to the axis, parallel perpendicular lines can only be drawn at intervals equal to the hypotenuse or adjacent sides of each set square. In this case, drawing parallel perpendicular lines greater than the size of a set square requires each set square to be made larger, further reducing portability. On the other hand, if the size of the set square is left unchanged, the other set square, which is not the one used to draw the perpendicular line, must be moved from its original position, which could result in misalignment and make it difficult to draw accurate perpendicular lines or parallel lines to the perpendicular lines.

[0008] The present invention has been made in consideration of the above circumstances, and has as its object to provide a ruler that is highly portable and suitable for drawing perpendicular lines and lines parallel to the perpendicular lines. [Means for solving the problem]

[0009] To achieve this objective, the ruler described in claim 1 is a ruler that can be used by combining a base member formed in a plate shape with a separation member formed in a plate shape and separable from the base member, wherein the base member has a recess formed in a concave shape on its upper surface, the separation member has a separation side scale portion with a scale that can be fitted in the longitudinal direction of the recess, and a fitting portion that can be fitted in the lateral direction of the recess, and the ruler is configured so that when the separation side scale portion is fitted in the recess, the base member and the separation member are difficult to separate, and when the fitting portion is fitted in the recess, the long side of the separation side scale portion can slide while maintaining a perpendicular state relative to the long side of the base member.

[0010] The ruler of claim 2 is the ruler of claim 1, wherein the base member has a base-side scale portion on the short side of the recess, with scales on the upper or lower surface of the base member, and the separation member has an intermediate portion formed between the separation-side scale portion and the mating portion, and the intermediate portion is configured to mating with the upright wall of the recess and the base-side scale portion, and the separation member is configured so that when the intermediate portion is mated with the upright wall and the base-side scale portion, the long side of the separation-side scale portion can slide relative to the long side of the base member while maintaining a perpendicular state.

[0011] The ruler described in claim 3 is the ruler described in claim 1 or claim 2, wherein the separation side scale portion is shaped so that when the separation side scale portion is fitted into the recess, the upper surface of the separation side scale portion is flush with the upper surface of the base member.

[0012] The ruler described in claim 4 is the ruler described in claims 1 to 3, wherein the separation side scale portion is shaped so that when the mating portion is mated with the recess, the lower surface of the separation side scale portion is flush with the lower surface of the base member.

[0013] The ruler according to claim 5 is the ruler according to claims 1 to 4, wherein the separating member is: a removal head formed continuously from the separation side scale portion; In a state where the mating portion is mated with the recess, Removal head side The shape does not protrude beyond the outer shape of the base member.

[0014] The ruler described in claim 6 is a ruler described in claims 1 to 5, wherein the recess and the mating portion are configured to be matable so that the separation side scale portion protrudes on one long side of the base member, and to be matable so that the separation side scale portion protrudes on the other long side of the base member.

[0015] The ruler described in claim 7 is a ruler described in claims 1 to 6, in which the base member has a scale base point at a position that overlaps with the long side of the mating portion when the mating portion is mated to either end of the recess.

[0016] The ruler described in claim 8 is a ruler described in claims 1 to 7, wherein the base member comprises a first magnetic body embedded longitudinally in the bottom surface of the recess, and the separation member comprises a magnet embedded in the mating portion, and the separation member is configured to be slidable while exerting the magnetic force of the magnet on the first magnetic body when the mating portion is mated with the recess.

[0017] The ruler described in claim 9 is the ruler described in claim 8, wherein the base member is provided with a second magnetic body embedded in a position where the magnetic force of the magnet can reach when the separation side scale portion is engaged with the recess. [Effects of the Invention]

[0018] According to the ruler described in claim 1, there is provided a ruler that can be used by combining a plate-shaped base member and a plate-shaped separation member that can be separated from the base member, wherein the base member has a recess formed in a concave shape on its upper surface, the separation member has a separation-side scale portion that can be fitted in the longitudinal direction of the recess and is graduated and can be fitted in the lateral direction of the recess, and the ruler is configured so that when the separation-side scale portion is fitted in the recess, the base member and the separation member are difficult to separate, and when the fitting portion is fitted in the recess, the long side of the separation-side scale portion can slide relative to the long side of the base member while maintaining a perpendicular state. This has the effect of providing excellent portability and allowing accurate and easy drawing of perpendicular lines and lines parallel to the perpendicular lines.

[0019] The ruler of claim 2 achieves the following effect in addition to the effect of the ruler of claim 1. That is, the base member has a base-side scale portion on the shorter side of the recess, with scales on the upper or lower surface of the base member, and the separation member has an intermediate portion formed between the separation-side scale portion and the engagement portion, and the intermediate portion is configured to engage with the upright wall of the recess and the base-side scale portion, and the separation member is configured so that when the intermediate portion is engaged with the upright wall and the base-side scale portion, the long side of the separation-side scale portion can slide relative to the long side of the base member while maintaining a perpendicular state. This has the effect of providing excellent portability and making it possible to accurately and easily draw perpendicular lines and lines parallel to the perpendicular lines.

[0020] The ruler of claim 3 achieves the following effect in addition to the effect of the ruler of claim 1 or 2. That is, the separation-side scale portion has a shape such that the upper surface of the separation-side scale portion is flush with the upper surface of the base member when the separation-side scale portion is fitted into the recess. This has the effect of providing excellent portability and enabling accurate and easy drawing of perpendicular lines and lines parallel to the perpendicular lines.

[0021] The ruler of claim 4 achieves the following effect in addition to the effects of the rulers of claims 1 to 3. That is, the separation-side scale portion has a shape such that the lower surface of the separation-side scale portion is flush with the lower surface of the base member when the mating portion is mated with the recess. This has the effect of providing excellent portability and enabling accurate and easy drawing of perpendicular lines and lines parallel to the perpendicular lines.

[0022] According to the ruler of claim 5, in addition to the effects of the rulers of claims 1 to 4, the following effect is achieved. That is, the separating member: a removal head formed continuously from the separation side scale portion; In a state where the mating portion is mated with the recess, Removal head side The shape of the base member is such that the length of the base member is not protruded beyond the outer shape of the base member. This provides the advantages of excellent portability and enabling accurate and easy drawing of perpendicular lines and lines parallel to the perpendicular lines.

[0023] The ruler of claim 6 achieves the following effect in addition to the effects of the rulers of claims 1 to 5. That is, the recess and the mating portion are configured to be matable so that the separation-side scale portion protrudes toward one long side of the base member, and so that the separation-side scale portion protrudes toward the other long side of the base member. This has the effect of providing excellent portability and making it possible to accurately and easily draw perpendicular lines and lines parallel to the perpendicular lines.

[0024] The ruler of claim 7 achieves the following effect in addition to the effects of the rulers of claims 1 to 6. That is, the base member has a scale base point at a position that overlaps with the long side of the mating portion when the mating portion is mated with either end of the recess. This has the effect of providing excellent portability and making it possible to accurately and easily draw perpendicular lines and lines parallel to the perpendicular lines.

[0025] The ruler of claim 8 achieves the following effect in addition to the effects of the rulers of claims 1 to 7. That is, the base member includes a first magnetic body embedded in the lengthwise direction in the bottom surface of the recess, and the separating member includes a magnet embedded in the mating portion, and when the mating portion is mated with the recess, the separating member is configured to be slidable while exerting the magnetic force of the magnet on the first magnetic body. This has the effect of providing excellent portability and making it possible to accurately and easily draw perpendicular lines and lines parallel to the perpendicular lines.

[0026] The ruler of claim 9 achieves the following effect in addition to the effect of the ruler of claim 8. That is, the base member includes a second magnetic body embedded in a position where the magnetic force of the magnet can reach when the separation-side scale portion is fitted in the recess. This has the effect of providing excellent portability and enabling accurate and easy drawing of perpendicular lines and lines parallel to the perpendicular lines. [Brief explanation of the drawings]

[0027] [Figure 1] (a) is an oblique view of the ruler unit in the first embodiment of the present invention, (b) is a plan view of the ruler unit viewed from the direction of line Ib in (a), and (c) is a front view of the ruler unit viewed from the direction of line Ic in (a). [Figure 2] (a) is an oblique view of the base ruler, (b) is a plan view of the base ruler viewed from line IIb in (a), and (c) is a front view of the base ruler viewed from line IIc in (a). [Figure 3] (a) is a perspective view of the perpendicular ruler, (b) is a plan view of the perpendicular ruler seen from the direction of line IIIb in (a), and (c) is a front view of the perpendicular ruler seen from the direction of line IIIc in (a). [Figure 4] (a) is a plan view showing the state in which the perpendicular ruler is slid to the left in plan view while the sliding protrusion of the perpendicular ruler is engaged with the right end of the recess of the base ruler in plan view, (b) is a cross-sectional view corresponding to line IVb in (a), and (c) is an enlarged cross-sectional view enlarging the area within line IVc in (b). DETAILED DESCRIPTION OF THE INVENTION

[0028] First Embodiment Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. First, a first embodiment in which the present invention is applied to a ruler unit 1 will be described with reference to FIGS. 1 to 3. FIG. 1 is a diagram of the ruler unit 1 in the first embodiment, which combines a base ruler 10 and a perpendicular ruler 20. FIG. 1(a) is a perspective view of the ruler unit 1, FIG. 1(b) is a plan view of the ruler unit 1 viewed from the Ib direction in FIG. 1(a), and FIG. 1(c) is a front view of the ruler unit 1 viewed from the Ic direction in FIG. 1(a). FIG. 2 is a diagram of the base ruler 10. FIG. 2(a) is a perspective view of the base ruler 10, FIG. 2(b) is a plan view of the base ruler 10 viewed from the IIb direction in FIG. 2(a), and FIG. 2(c) is a front view of the base ruler 10 viewed from the IIc direction in FIG. 2(a). Furthermore, Fig. 3 is a diagram relating to the perpendicular line ruler 20, with Fig. 3(a) being a perspective view of the perpendicular line ruler 20, Fig. 3(b) being a plan view of the perpendicular line ruler 20 seen from direction IIIb in Fig. 3(a), and Fig. 3(c) being a front view of the perpendicular line ruler 20 seen from direction IIIc in Fig. 3(a). Note that in the perspective views of Figs. 1(a), 2(a), and 3(a), the scales are omitted to improve the visibility of each component. Also, in the plan view of Fig. 1(b), the scales on the scale portion 21 (see Fig. 3) are omitted to improve the visibility of each component.

[0029] First, details of the ruler unit 1 will be described with reference to Figure 1. The ruler unit 1 is formed to a size (e.g., 16 centimeters) in its overall length direction that can be stored in a writing implement case, and is composed of a base ruler 10 integrally molded into a plate from a transparent synthetic resin material (e.g., acrylic resin, vinyl chloride, etc.) combined with a perpendicular ruler 20 also integrally molded into a plate from a transparent synthetic resin material. Note that the scale portion 21 (described below) of the perpendicular ruler 20 may be colored (e.g., black, etc.) to make the scales on the scale portion 21 easier to read and to improve the design by providing a contrast when the perpendicular ruler 20 is combined with the base ruler 10.

[0030] This ruler unit 1 is arranged so that when a scale portion 21 (see FIG. 3) provided on the perpendicular line ruler 20, which will be described later, is fitted into a recess 11 (see FIG. 2) provided on the base ruler 10, which will be described later, the positioning iron piece 17 provided on the base ruler 10, which will be described later, is magnetically attracted to a magnet 25 provided on the perpendicular line ruler 20, which will be described later (see FIG. 1(c)). This makes it difficult for the perpendicular line ruler 20 to be separated from the base ruler 10 when the base ruler 10 and the perpendicular line ruler 20 are combined to form the ruler unit 1, so that when the ruler unit 1 is stored in a writing implement case or the like, for example, the perpendicular line ruler 20 is prevented from coming off from the base ruler 10 inside the writing implement case, thereby improving the storability and portability of the ruler unit 1.

[0031] Furthermore, when the scale portion 21 (see Figure 3) of the perpendicular ruler 20 is fitted into the recess 11 (see Figure 2) of the base ruler 10 (i.e., the state in which the positioning iron piece 17 and the magnet 25 are magnetically attached; hereinafter, this may be referred to as "unitization"), the scale portion 21 is formed to a thickness such that at least the top surface of the scale portion 21 is flush (on the same plane) with the top surface of the base ruler 10 (for example, a thickness of 2 mm for the scale portion 21 when the depth of the recess 11 is 2 mm). As a result, when the base ruler 10 and the perpendicular ruler 20 are united, the scale portion 21 of the perpendicular ruler 20 does not protrude from the top surface of the base ruler 10, forming a smooth, flush surface, which not only provides functional beauty but also prevents the perpendicular ruler 20 from coming off the base ruler 10 due to an impact on the top surface of the perpendicular ruler 20 when they are united, thereby improving storability and portability.

[0032] Next, the details of the base ruler 10 will be described with reference to Figure 2. This base ruler 10 is composed of at least a recess 11 formed by a plurality of upright walls 11a and a bottom surface 11b, a sliding iron plate 12 embedded in the bottom surface 11b of the recess 11, a base lower edge 13 forming one side of the base ruler 10, a bottom-side scale portion 14 located between the recess 11 and the base lower edge 13, a base upper edge 15 forming one side opposite the base lower edge 13, an top-side scale portion 16 located between the recess 11 and the base upper edge 15, a positioning iron piece 17 embedded in the flat plate portion on the left side of the recess 11 in a plan view, a notch portion 18 formed so as to cut out the left side portion of the base ruler 10 in a plan view, and a collision portion 19 formed at the right end of the base lower edge 13 in a plan view.

[0033] The recess 11 is formed in a concave shape by a plurality of upright walls 11a and a bottom surface 11b on the upper surface of the base ruler 10 in a plan view, and is shaped so that the scale portion 21 (see Figure 3) described later of the perpendicular ruler 20 can be fitted without gaps in the longitudinal direction of the base ruler 10 (i.e., the left-right direction in Figure 2(b)), and the sliding protrusion 23 (see Figure 3) described later of the perpendicular ruler 20 can be fitted without gaps in the vertical direction in a plan view in the lateral direction of the base ruler 10 (i.e., the up-down direction in Figure 2(b)). In addition, the upright walls 11a of the recess 11 are formed so as to be parallel to the base lower edge 13 and the base upper edge 15 described later in a plan view.

[0034] In the first embodiment, when stored, the ruler unit 1 is assembled by fitting the scale portion 21 of the perpendicular ruler 20 into this recess 11, thereby improving storability and portability. When drawing a perpendicular line, by fitting the sliding protrusion 23 of the perpendicular ruler 20 into the recess 11 and sliding the perpendicular ruler 20 left and right in plan view, the scale portion 21 can be slid left and right in plan view while the upright wall 11a and bottom surface 11b of the recess 11 come into contact with the sliding protrusion 23, and perpendicular lines to the base lower edge 13 or base upper edge 15 of the base ruler 10 and parallel lines to the perpendicular lines (hereinafter sometimes referred to as "perpendicular lines and parallel lines") can be drawn continuously, accurately, and easily.

[0035] Although not shown, reference lines are provided on the bottom surface 11b of the recess 11 at regular intervals (for example, 5 mm intervals, 6 mm intervals, 7 mm intervals, 8 mm intervals, etc.). As a result, when fitting the sliding protrusion 23 into the recess 11 to draw perpendicular and parallel lines, the reference lines can be seen because the removal head 22 (described later) of the perpendicular line ruler 20 is made of a transparent material, and it becomes possible to draw perpendicular lines continuously at desired regular intervals using the reference lines as markers, making it possible to quickly draw perpendicular and parallel lines.

[0036] The sliding iron plate 12 is a magnetic material (made of iron in the first embodiment) and is embedded in the bottom surface 11b of the recess 11 so as to be engaged with the longitudinal upright walls 11a of the recess 11, and is embedded so as to form the same surface (the same plane) as the bottom surface 11b of the recess 11. In other words, by forming the sliding iron plate 12 to be longer than the longitudinal length of the recess 11 and engaging both ends of the sliding iron plate 12 with the lower ends of the longitudinal upright walls 11a, it is possible to make the sliding iron plate 12 difficult to remove from the base ruler 10. The sliding iron plate 12 may also be attached to the bottom surface of the recess 11 with an adhesive or the like.

[0037] Furthermore, this sliding iron plate 12 is embedded in the bottom surface 11b so that, when the sliding protrusion 23 is fitted into the recess 11, it is magnetically attracted to a magnet 25 (see FIG. 3) described later that is embedded in the sliding protrusion 23 of the perpendicular line ruler 20 at all positions within the recess 11. As a result, when drawing perpendicular and parallel lines, the sliding protrusion 23 can be slid within the recess 11 while the magnetic force of the magnet 25 is applied to the sliding iron plate 12, and displacement of the sliding protrusion 23 relative to the recess 11 is suppressed, so perpendicular and parallel lines can be drawn continuously, accurately, and easily.

[0038] The base lower edge 13 is a portion formed on the lower side of the base ruler 10 in a planar view, and as described above, is formed in a shape that is parallel to the upright wall 11a of the recess 11 on the side of the base lower edge 13 in a planar view. A user of the ruler unit 1 can draw a straight line (axis) by moving a writing instrument while it is in contact with the base lower edge 13. In addition, a collision portion 19 is formed on the right end of the base ruler 10 in a planar view. When a writing instrument is contacted with the left side of the long side of the base ruler 10 in a planar view to draw a straight line, the collision portion 19 causes the writing instrument to collide with the collision portion 19 when it reaches the right end of the base ruler 10 in a planar view. This collision portion 19 functions as a stopper, preventing the writing instrument from moving beyond the length of the base lower edge 13, and therefore preventing the writing instrument from bending the straight line by exceeding the length of the base lower edge 13.

[0039] The lower-side scale portion 14 is a flat plate formed by the upright wall 11a of the recess 11 in the short direction and the base lower side 13, and has linear scale markings (see FIG. 2(b)) printed on its upper surface (or lower surface) at predetermined intervals (e.g., short lines at 1 mm intervals, medium lines at 5 mm intervals, and long lines at 10 mm intervals) in a first color (e.g., black) over a predetermined length (14 cm in the first embodiment). The linear scale markings on the lower-side scale portion 14 are marked to the left in a plan view, with the collision area 19 serving as the base point (i.e., 0). This allows a user to easily draw a straight line by contacting the collision area 19 with a writing implement and then moving the writing implement to the left in a plan view, while finding the origin of the line. The linear scale markings may be configured so that the base point is set in the opposite direction to that in the first embodiment (i.e., on the right side in a plan view).

[0040] In addition, above the linear scale in a plan view, vertical scale markings (see FIG. 2(b)) are printed over a predetermined length (12 centimeters in the first embodiment) at predetermined intervals (for example, short lines at 1 mm intervals, medium lines at 5 mm intervals, and long lines at 10 mm intervals) in a second color (for example, blue) different from the first color.

[0041] The base point (i.e., 0) of this perpendicular scale is provided at a position overlapping one of the long sides (the left side in plan view in the first embodiment; see FIG. 4 ) of the scale portion 21 when the sliding protrusion 23 is fitted to each end of the recess 11 in the longitudinal direction (i.e., the left end or the right end in plan view). This allows, when drawing multiple perpendicular lines, to first draw a perpendicular line from the base point when the sliding protrusion 23 is fitted to the recess 11, and then draw perpendicular lines (parallel lines) according to the perpendicular scale while sliding the perpendicular ruler 20, thereby drawing accurate perpendicular lines (parallel lines) at the desired intervals. In particular, because the removal head 22 and the sliding protrusion 23 of the perpendicular ruler 20 are made of a transparent material, the perpendicular scale is visible, and the intervals between the perpendicular lines can be easily recognized while viewing the perpendicular scale. Note that the removal head 22 and the sliding protrusion 23 may be provided with perpendicular reference lines, window frame lines, or the like to make it easier to understand the contents of the perpendicular scale. The perpendicular scale may also be configured so that the base point is provided in the opposite direction to that in the first embodiment (i.e., on the left side in plan view).

[0042] Furthermore, the base lower edge 13, the lower edge scale portion 14, and the upright wall 11a of the recess 11 on the base lower edge 13 side (hereinafter sometimes referred to as the "engaged portion"; the same applies to the base upper edge 15, the upper edge scale portion 16, and the upright wall 11a of the recess 11 on the base upper edge 15 side, which will be described later) are configured in a shape that allows for an edge engagement portion 24 (see Figure 3), which will be described later, of the perpendicular ruler 20 to be engaged with when the sliding protrusion 23 is engaged with the recess 11 and slid left and right in a plan view. In other words, when the sliding protrusion 23 is engaged with the recess 11 and slid left and right in a plan view, not only is the sliding protrusion 23 configured to be slidable while engaging with the recess 11, but the edge engagement portion 24 of the perpendicular ruler 20 is configured to be slidable while engaging with the engaged portion. As a result, when drawing a perpendicular line while sliding the perpendicular line ruler 20 against the base ruler 10, the fitting of the recess 11 and the sliding protrusion 23, and the fitting of the edge fitting portion 24 and the fitted portion, make it easier to maintain the perpendicular state between the base ruler 10 and the perpendicular line ruler 20, and perpendicular lines and parallel lines can be drawn continuously, accurately, and easily.

[0043] The base upper edge 15 is a portion formed on the upper side of the base ruler 10 in a plan view, and as described above, is formed in a shape that is parallel to the upright wall 11a in the short direction of the recess 11 on the side of the base upper edge 15 (the upright wall 11a of the recess 11 on the side of the base lower edge 13) in a plan view. A user of the ruler unit 1 can draw a straight line by moving a writing implement while it is in contact with this base upper edge 15.

[0044] The upper edge scale portion 16 is a flat plate portion formed by the upright wall 11a in the short direction of the recess 11 and the upper edge 15 of the base, and linear scales (see FIG. 2(b)) in a first color (e.g., black) are printed on its upper surface (or lower surface) over a predetermined length (14 cm in the first embodiment) at predetermined intervals (e.g., short lines at 1 mm intervals, medium lines at 5 mm intervals, and long lines at 10 mm intervals). Note that the linear scales may be configured so that the base point is set in the opposite direction to that in the first embodiment (i.e., on the right side in plan view).

[0045] Additionally, below the linear scale in plan view, vertical scale markings (not shown) are printed over a predetermined length (12 centimeters in the first embodiment) at predetermined intervals (for example, short lines at 1 mm intervals, medium lines at 5 mm intervals, and long lines at 10 mm intervals) in a second color (for example, blue) different from the first color. As with the bottom-side scale portion 14, the base point (i.e., 0) of this vertical scale marking is provided at a position overlapping with one of the long sides (the left side in plan view in the first embodiment; see FIG. 4) of scale portion 21 when slide protrusion 23 is fitted to each end (i.e., the left end or right end in plan view) of recess 11. As a result, when drawing multiple perpendicular lines, with the sliding protrusion 23 mated with the recess 11, first draw a perpendicular line from the base point, and then draw perpendicular lines (parallel lines) according to the perpendicular line scale while sliding the perpendicular line ruler 20, thereby making it possible to draw accurate perpendicular lines (parallel lines) at desired intervals. Note that the perpendicular line scale may be configured so that the base point is provided in the opposite direction to that in the first embodiment (i.e., on the right side in plan view).

[0046] Furthermore, the width of this upper edge scale portion 16 is configured to be the same as the width of the lower edge scale portion 14. This allows the slide protrusion 23 to be fitted to the recess 11 so that the scale portion 21 is positioned toward the base lower edge 13, and the edge fitting portion 24 to be fitted to the fitted portion, and the slide protrusion 23 to be fitted to the recess 11 so that the scale portion 21 is positioned toward the base upper edge 15, and the edge fitting portion 24 to be fitted to the fitted portion. In other words, perpendicular and parallel lines can be drawn from the base ruler 10 toward the base lower edge 13, and perpendicular and parallel lines can also be drawn from the base ruler 10 toward the base upper edge 15, improving the operability and functionality of the ruler unit 1.

[0047] The positioning iron piece 17 is a magnetic material (made of iron in the first embodiment) and is embedded in a flat plate on the left side of the recess 11 in plan view, within the range of the magnetic force of the magnet 25 (for example, directly below the magnet 25 in plan view) when the scale portion 21 is fitted into the recess 11. This allows the base ruler 10 and the perpendicular line ruler 20 to be magnetically attracted together by the magnetic force of the magnet 25 when the scale portion 21 is fitted into the recess 11, that is, when the ruler unit 1 is unitized, thereby preventing the perpendicular line ruler 20 from separating from the base ruler 10 and improving storability and portability.

[0048] The cutout 18 is a semicircular cutout on the left side of the base ruler 10 in a plan view, and is configured so that when the scale portion 21 is fitted into the recess 11, a removal head 22 (see Figure 3) of the perpendicular ruler 20, which will be described later, is located above the cutout 18 in a plan view. In other words, when the scale portion 21 is fitted into the recess 11, a gap is formed below the removal head 22 of the perpendicular ruler 20 in a plan view, making it easier to hook a finger on the removal head 22 when the scale portion 21 is fitted into the recess 11, and making it easier to remove the perpendicular ruler 20 from the base ruler 10.

[0049] Next, the details of the perpendicular ruler 20 will be described with reference to Figure 3. This perpendicular ruler 20 is made up of at least a scale portion 21, a removal head portion 22 formed continuously from the scale portion 21, a sliding protrusion portion 23 formed to protrude below the removal head portion 22 in a plan view, a side joint portion 24 formed between the sliding protrusion portion 23 and the scale portion 21, and a magnet 25 embedded in the underside of the sliding protrusion portion 23.

[0050] The scale portion 21 is formed in a flat plate shape with its lower (or upper) surface colored (e.g., black). On each of the longitudinal separation-side lower edge 21a and the longitudinal separation-side upper edge 21b, a third color (e.g., white) scale for measuring perpendicular line length (see FIG. 3(b)) is printed at predetermined intervals (e.g., short lines at 1 mm intervals, medium lines at 5 mm intervals, and long lines at 10 mm intervals) over a predetermined length (12 cm in the first embodiment) on each of the separation-side lower edge 21a and the separation-side upper edge 21b. The scale (see FIG. 3(b)) is printed with a base point on the scale portion 21 side of the edge joint portion 24 described below. This means that the length of a perpendicular line can be measured with the base point being the position where the edge joint portion 24 abuts the base lower edge 13 or the base upper edge 15. This allows the length of the perpendicular line to be accurately measured when drawing a perpendicular line from the base ruler 10. The perpendicular line length scale may be configured so that the base point is located in the opposite direction to that in the first embodiment (i.e., on the right side in a plan view).

[0051] As described above, the scale portion 21 is configured so that its entirety fits into the recess 11 of the base ruler 10. This allows the scale portion 21 to fit into the recess 11, improving the storability and portability of the ruler unit 1.

[0052] The removal head 22 is formed continuously from the scale portion 21, and is sized so that its tip is located above the cutout 18 of the base ruler 10 in a plan view when the sliding protrusion 23 is fitted into the recess 11. As a result, when the scale portion 21 is fitted into the recess 11, a gap is formed below the removal head 22 of the perpendicular ruler 20 in a plan view, making it easier to hook a finger on the removal head 22 when the scale portion 21 is fitted into the recess 11, and making it easier to remove the perpendicular ruler 20 from the base ruler 10 when the ruler unit 1 is unitized.

[0053] Furthermore, the removal head 22 is formed to a size that does not protrude from the left end of the base ruler 10 in a plan view when the scale portion 21 is fitted in the recess 11. This prevents interference with the removal head 22 when the scale portion 21 is fitted in the recess 11, and prevents the perpendicular ruler 20 from separating from the base ruler 10, improving storability and portability.

[0054] Furthermore, this removal head 22 is formed to a size that does not protrude beyond the outline of the base lower edge 13 or base upper edge 15 of the base ruler 10 when the sliding protrusion 23 is engaged with the recess 11 and slides left and right in a plan view. As a result, the removal head 22 does not protrude from the base ruler 10 in any sliding position with the sliding protrusion 23 engaged with the recess 11, and therefore, for example, when sliding the perpendicular line ruler 20, it is possible to prevent the removal head 22 from colliding with other stationery placed on a desk, thereby improving the operability of the perpendicular line ruler 20.

[0055] As described above, the sliding protrusion 23 is formed in a shape in which a portion of the removal head 22 bulges downward in a plan view, and is formed to a size that allows it to fit into the recess 11 of the base ruler 10. By fitting this sliding protrusion 23 into the recess 11, that is, by sliding the perpendicular ruler 20 while abutting it against the upright wall 11a and bottom surface 11b of the recess 11, perpendicular and parallel lines to the base ruler 10 can be drawn accurately and easily.

[0056] As described above, the side engaging portion 24 is located between the scale portion 21 and the sliding protrusion 23, and is formed on the underside of the perpendicular line ruler 20 in a plan view, in a shape that can engage with the engaged portion of the recess 11 in the base ruler 10. As a result, when drawing a perpendicular line while sliding the perpendicular line ruler 20 against the base ruler 10, the engagement of the recess 11 and the sliding protrusion 23, and the engagement of the side engaging portion 24 and the engaged portion, make it easier to maintain the perpendicular state of the base ruler 10 and the perpendicular line ruler 20, and perpendicular and parallel lines can be drawn continuously, accurately, and easily.

[0057] The magnet 25 can be magnetically attached to the sliding iron plate 12 or positioning iron piece 17 of the base ruler 10, and is embedded in the sliding protrusion 23 so as to form a flush surface (the same plane) with the underside of the sliding protrusion 23. When the scale portion 21 is fitted into the recess 11, the positioning iron piece 17 is magnetically attached to the magnet 25, preventing the perpendicular ruler 20 from separating from the base ruler 10 and improving the storability and portability of the ruler unit 1. Furthermore, when the sliding protrusion 23 is fitted into the recess 11, the sliding iron plate 12 is magnetically attached to the magnet 25 in any sliding position, preventing the perpendicular ruler 20 from coming off the base ruler 10 or losing its vertical position when drawing perpendicular and parallel lines, allowing perpendicular and parallel lines to be drawn continuously, accurately, and easily.

[0058] Next, with reference to Figure 4, we will explain the state in which the perpendicular ruler 20 is slid left and right in plan view while the sliding protrusion 23 is engaged with the recess 11. Figure 4(a) is a schematic plan view showing a state in which the perpendicular ruler 20 is slid to the left in plan view (upper side in the drawing) while keeping the sliding protrusion 23 engaged, from a state in which the sliding protrusion 23 of the perpendicular ruler 20 is engaged with the right end in plan view (lower side in the drawing) of the recess 11 of the base ruler 10, Figure 4(b) is a cross-sectional view corresponding to line IVb in Figure 4(a), and Figure 4(c) is an enlarged cross-sectional view enlarging the area within line IVc in Figure 4(b).

[0059] As shown in Figure 4(a), when drawing perpendicular and parallel lines to the base ruler 10, the sliding protrusion 23 of the perpendicular ruler 20 is fitted into the recess 11 of the base ruler 10, and the sliding protrusion 23 is slid into the recess 11 in the left-right direction when viewed from above (up-down direction in the figure), while drawing a line while a writing implement is placed against the separation side lower edge 21a or separation side upper edge 21b of the perpendicular ruler 20 at the desired position, thereby accurately and easily drawing perpendicular lines to the base lower edge 13 (and base upper edge 15) of the base ruler 10.

[0060] In this case, when the sliding protrusion 23 is fitted to the right end of the recess 11 in plan view, the base point (i.e., 0) of the perpendicular line scale attached to the lower edge 14 (or upper edge 16) of the base ruler 10 is positioned on an extension of the separation-side lower edge 21a or separation-side upper edge 21b (separation-side lower edge 21a in the first embodiment) of the perpendicular line ruler 20. This allows the sliding protrusion 23 to be fitted to the right end (or left end) of the recess 11 in plan view, and when first drawing one perpendicular line with the separation-side lower edge 21a, and then sliding the perpendicular line ruler 20 to the left (or right) in plan view (upward in Figure 4(a)) to draw the next perpendicular line, the distance between the first perpendicular line and the next perpendicular line can be accurately drawn at the desired interval.

[0061] 4(b) and 4(c), when sliding the perpendicular line ruler 20, the magnet 25 provided on the sliding protrusion 23 slides while being magnetically attracted to the sliding iron plate 12 in the recess 11, and the magnetic force of the magnet 25 reaches the sliding iron plate 12, preventing the perpendicular line ruler 20 from coming off or shifting in position from the base ruler 10. Therefore, because the positional shift of the sliding protrusion 23 relative to the recess 11 is prevented, perpendicular and parallel lines can be drawn continuously, accurately, and easily.

[0062] As explained above, in the ruler unit 1 of the first embodiment, the base ruler 10 and the perpendicular line ruler 20 are difficult to separate when stored, thereby improving storability and portability, and when drawing perpendicular lines and parallel lines, the perpendicular line ruler 20 can be slid relative to the base ruler 10 while making it easier to maintain the perpendicular state between the base ruler 10 and the perpendicular line ruler 20, making it possible to accurately and easily draw perpendicular lines and parallel lines to the base ruler 10.

[0063] <Variation 1> In the above embodiment, the base ruler 10 is provided with a sliding iron plate 12 and a positioning iron piece 17, and a magnet 25 is embedded in the sliding protrusion 23 of the perpendicular ruler 20, so that the magnetic force of the magnet 25 is applied to the sliding iron plate 12 and the positioning iron piece 17, allowing the perpendicular ruler 20 to slide relative to the base ruler 10 and also magnetically attaching it to the storage position. Alternatively, the base ruler 10 may be provided with a sliding magnet and a positioning magnet, and sliding and positioning iron pieces may be embedded in the sliding protrusion 23 of the perpendicular ruler 20.

[0064] <Variation 2> In the above embodiment, the base ruler 10 is provided with a sliding iron plate 12 and a positioning iron piece 17, and a magnet 25 is embedded in the sliding protrusion 23 of the perpendicular ruler 20. The magnetic force of the magnet 25 is applied to the sliding iron plate 12 and the positioning iron piece 17, allowing the perpendicular ruler 20 to slide and be positioned relative to the base ruler 10. However, the base ruler 10 and the perpendicular ruler 20 may be configured without magnets, iron plates, or iron pieces. That is, the recess 11 and the sliding protrusion 23, the edge engagement portion 24 and the engaged portion, or the recess 11 and the scale portion 21 may simply be configured to engage with each other. This configuration reduces the manufacturing cost of the ruler unit 1. In this case, by constructing the base ruler 10 and the perpendicular line ruler 20 from an elastically deformable material, and forming the dimensions of the recess 11 and the sliding protrusion 23, the edge mating portion 24 and the mated portion, or the recess 11 and the scale portion 21 to fit together exactly, it is possible to make it difficult for the perpendicular line ruler 20 to come off the base ruler 10 even in the absence of a magnet or the like.

[0065] <Variation 3> In the above embodiment, the sliding protrusion 23 of the perpendicular ruler 20 is fitted to the recess 11 of the base ruler 10, thereby drawing a perpendicular line from the base ruler 10. Alternatively, the sliding protrusion 23 may be fitted to the left end of the recess 11 of the base ruler 10 in plan view, forming a widened recess that widens the left end of the recess 11 downward in plan view so that the base lower edge 13 and the separation-side lower edge 21a are on the same straight line (i.e., an extension line). With this configuration, when it is desired to extend a straight line that is longer than the long side of the base ruler 10, fitting the sliding protrusion 23 to the widened recess makes it possible to draw a straight line that is 10 minutes long of the base ruler plus a straight line that is 20 minutes long of the perpendicular ruler, thereby improving the functionality of the ruler unit 1.

[0066] <Variation 4> In the above embodiment, by fitting the sliding protrusion 23 of the perpendicular ruler 20 into the recess 11 of the base ruler 10, it is possible to draw a perpendicular line from the base ruler 10 and accurately and easily draw the axes of a two-dimensional graph having, for example, an X-axis and a Y-axis. Alternatively, a Z-axis recess may be formed at one of the longitudinal ends of the recess 11, in which the sliding protrusion 23 fits and is held with the scale portion 21 tilted 135 degrees (or 225 degrees) from the base bottom edge 13 or the base top edge 15. With this configuration, the X-axis can be drawn using the base lower edge 13 or the base upper edge 15 of the base ruler 10, the Y-axis can be drawn using the separation-side lower edge 21a or the separation-side upper edge 21b of the perpendicular ruler 20 by fitting the sliding protrusion 23 into the recess 11, and the Z-axis can be drawn using the separation-side lower edge 21a or the separation-side upper edge 21b of the perpendicular ruler 20 by fitting the sliding protrusion 23 into the Z-axis recess. This makes it possible to accurately and easily draw each axis when creating a three-dimensional graph with X, Y, and Z axes.

[0067] <Variation 5> In the above embodiment, by fitting the sliding protrusion 23 of the perpendicular ruler 20 to the recess 11 of the base ruler 10, a perpendicular line can be drawn from the base ruler 10, making it possible to accurately and easily draw the axes of a two-dimensional graph having an X-axis and a Y-axis, for example. On the other hand, when the sliding protrusion 23 is fitted to one of the longitudinal ends of the recess 11, and the X-axis is drawn by one of the base lower edges 13 or base upper edges 15, and the Y-axis is drawn by the separation-side lower edge 21a or separation-side upper edge 21b, a reference line for the Z-axis may be drawn at a position on the other base upper edge 15 or base lower edge 13 that is 135 degrees below the X-axis (or 225 degrees to the left of the Y-axis) from the base points of the X-axis and Y-axis. In this case, with the X-axis and Y-axis drawn, a mark (for example, a point) is written at a position corresponding to the Z-axis reference line, and then a line is drawn connecting the base points of the X-axis and Y-axis to the mark, thereby enabling each axis to be drawn accurately and easily when creating a three-dimensional graph with XYZ axes.

[0068] <Variation 6> In the above embodiment, the bottom surface 11b of the recess 11 of the base ruler 10 is formed to be flush. Alternatively, one or more grooves may be drilled in the bottom surface 11b of the recess 11. This allows debris (such as eraser shavings) that has accumulated in the recess 11 to fall through the grooves, preventing the sliding protrusion 23 from shifting due to debris accumulated in the recess 11 and making it possible to accurately and easily draw perpendicular and parallel lines to the base ruler 10.

[0069] <Variation 7> In the above embodiment, the perpendicular line ruler 20 is provided with a removal head 22, and a cutout 18 is formed in the base ruler 10, so that the perpendicular line ruler 20 can be easily removed from the state in which the scale portion 21 is fitted into the recess 11. Alternatively, a protrusion may be provided on the upper part of the removal head 22 in plan view, so that the perpendicular line ruler 20 can be easily removed from the state in which the scale portion 21 is fitted into the recess 11 by pinching the protrusion with the fingers.

[0070] <Variation 8> In the above embodiment, the bottom surface 11b of the recess 11 of the base ruler 10 is formed to be flush. Alternatively, the entire recess 11 may be configured as a recessed shape that penetrates the base ruler 10. This effectively solves the problem of dust accumulation that occurs when a recess 11 is provided. In this case, the sliding iron plate 12 can also be provided by being inserted into the longitudinal side wall that forms the recess. Note that the term "concave" naturally includes a concave shape having side walls and a bottom surface, as well as a concave shape without a bottom surface.

[0071] <Variation 9> In the above embodiment, the scale portion 21 is configured to have a thickness such that when the scale portion 21 is fitted into the recess 11, the upper surface of the scale portion 21 is flush with the upper surface of the base ruler 10 (the upper surfaces of the base lower edge 13 and the base upper edge 15). However, the scale portion 21 may be formed to any thickness as long as the upper surface of the scale portion 21 does not protrude above the upper surface of the base ruler 10 when the scale portion 21 is fitted into the recess 11 (for example, if the height of the upright wall 11a is 2 mm, the thickness of the scale portion 21 is 1 mm).

[0072] <Modification 10> In the above embodiment, the bottom surface 11b of the recess 11 of the base ruler 10 and the top surface of the sliding iron plate 12 are formed to be flush with each other. Alternatively, the sliding iron plate 12 may be configured to protrude upward from the bottom surface 11b in a plan view. In this case, the sliding protrusion 23 of the perpendicular ruler 20 is formed into a shape that fits into the protruding sliding iron plate 12. This allows the sliding iron plate 12 to function as a rail, allowing the sliding protrusion 23 to slide smoothly on the sliding iron plate 12, making it possible to accurately and easily draw perpendicular and parallel lines to the base ruler 10.

[0073] <Variation 11> In the above embodiment, a positioning iron piece 17 is provided on the base ruler 10, and a magnet 25 is embedded in the slide protrusion 23 of the perpendicular ruler 20, so that the magnetic force of the magnet 25 acts on the positioning iron piece 17, magnetically attaching the perpendicular ruler 20 to the base ruler 10 in the storage position. Alternatively, a positioning base-side locking portion or a base-side locked portion may be provided on the base ruler 10, and a perpendicular-line side locked portion engageable with the base-side locking portion or a perpendicular-line side locking portion engageable with the base-side locked portion may be provided on the perpendicular ruler 20.

[0074] <Modification 12> In the above embodiment, the ruler unit 1 is configured to be sized to be stored in a writing implement case. However, it may be configured to be sized so that it can be used for writing on a blackboard or whiteboard in a school, etc. (for example, a total longitudinal length of 50 centimeters, etc.). In this case, a magnet or the like may be attached to the back surface of the base ruler 10 in a plan view so that the ruler unit 1 (base ruler 10) is magnetically attached to the blackboard, which is a magnetic material. This makes it possible to accurately and easily draw perpendicular lines, axis lines of graphs, etc. when writing on the blackboard.

[0075] <Variation 13> In the above embodiment, by fitting the sliding protrusion 23 of the perpendicular ruler 20 into the recess 11 of the base ruler 10, it is possible to draw a vertical, i.e., a 90-degree straight line from the base ruler 10. Alternatively, a line segment at a predetermined angle (e.g., 5 degrees, 10 degrees, 15 degrees, 20 degrees, 25 degrees, 30 degrees, 35 degrees, 40 degrees, 45 degrees, 50 degrees, 55 degrees, 60 degrees, 65 degrees, 70 degrees, 75 degrees, 80 degrees, and / or 85 degrees, etc.) may be added to a portion of the base lower edge 13 and / or base upper edge 15 of the base ruler 10 to the other base upper edge 15 and / or base lower edge 13, thereby providing an auxiliary line for drawing a predetermined angle line from the base lower edge 13 and / or base upper edge 15. In particular, by drawing angle lines of at least 30 degrees, 45 degrees, and 60 degrees from the base lower edge 13 and / or the base upper edge 15 to the other base upper edge 15 and / or the base lower edge 13, it becomes possible to draw 30-degree lines, 45-degree lines, and / or 60-degree lines on the base ruler 10 that can be drawn using a general set square, and the ruler unit 1 makes it possible to draw not only vertical lines but also angle lines that can be drawn using a general set square, so that desired angle lines can be drawn without using a set square that is bulky to carry around.

[0076] <Variation 14> In the above embodiment, the sliding protrusion 23 of the perpendicular ruler 20 is fitted into the recess 11 of the base ruler 10, allowing a perpendicular line to be drawn from the base ruler 10. Alternatively, the sliding protrusion 23 of the second perpendicular ruler 20 may be fitted into the recess 11 of the base ruler 10, allowing a desired object to be sandwiched between the first perpendicular ruler 20 and the other perpendicular ruler 20, thereby enabling the outer dimensions of the desired object to be measured. In this case, the short side dimension of the perpendicular ruler 20 described in the above embodiment may be halved so that the second perpendicular ruler 20 can fit into the recess 11 of the base ruler 10, allowing each of the second perpendicular rulers 20 to be accommodated in the recess 11 of the base ruler 10. Magnets 25 may be embedded in the sliding protrusions 23 of the two perpendicular rulers 20.

[0077] The present invention has been described above based on the above-described embodiments and modifications. However, the present invention is not limited to the above-described embodiments, and it is readily apparent that various modifications and improvements are possible within the scope of the present invention. For example, the embodiments or modifications may be modified by adding or replacing a part or parts of the configuration of the embodiment or modification with the embodiment or modification. Furthermore, the numerical values ​​given in the above-described embodiments or modifications are merely examples, and other numerical values ​​may of course be adopted. [Explanation of symbols]

[0078] 1 Ruler unit (part of a ruler) 10 Base ruler (part of the base material) 11 Recess 11a Standing wall 12 Slide iron plate (part of the first magnetic body) 13 Base bottom edge (part of the long side of the base member) 14 Bottom scale (part of base scale) 15 Upper edge of base (part of the long side of the base member) 16 Top scale (part of base scale) 17 Positioning iron piece (part of the second magnetic body) 20 Plumbing ruler (part of the separation member) 21 Scale (part of the scale on the separated side) 21a Lower edge of the separation side (part of the long side of the separation side scale) 21b Separation side upper edge (part of the long side of the separation side scale) 23 Slide protrusion (part of the mating part) 24 Marginal joint (part of the middle part) 25 Magnet

Claims

1. a base member formed in a plate shape; A ruler that can be used in combination with a separation member that is formed in a plate shape and can be separated from the base member, The base member is a recess formed in a concave shape on the upper surface thereof, The separating member is a separation-side scale portion that can be fitted to the recess in the longitudinal direction and has a scale; a mating portion that can be mated with the recess in the short side direction, The ruler is When the separation-side scale portion is fitted into the recess, the base member and the separation member are configured to be difficult to separate from each other, When the mating portion is mated with the recess, the long side of the separation-side scale portion is configured to be slidable while maintaining a perpendicular state with respect to the long side of the base member. A ruler characterized by:

2. The base member is a base-side scale portion having scales on the upper or lower surface of the base member, the base-side scale portion being located on the short-side side of the recess, The separating member is an intermediate portion formed between the separation-side graduation portion and the engagement portion, The intermediate portion is The recessed portion is configured to fit into the upright wall of the recessed portion and the base-side scale portion. The separating member is When the intermediate portion is fitted to the upright wall and the base-side scale portion, the long side of the separation-side scale portion is configured to be slidable while maintaining a perpendicular state with respect to the long side of the base member.

2. The ruler according to claim 1 .

3. The separation-side scale portion is When the separation-side graduation portion is fitted into the recess, the upper surface of the separation-side graduation portion is flush with the upper surface of the base member.

3. The ruler according to claim 1 or claim 2.

4. The separation-side scale portion is When the engagement portion is engaged with the recess, the lower surface of the separation-side scale portion is flush with the lower surface of the base member.

4. The ruler according to claim 1, wherein the ruler is a square.

5. The separating member is a removal head formed continuously from the separation side scale portion; When the engagement portion is engaged with the recess, the removal head portion does not protrude beyond the outer shape of the base member.

5. The ruler according to claim 1, wherein the ruler is a square.

6. The recess and the engagement portion are The separation-side scale portion is configured to be mateable with one long side of the base member so as to protrude, and the separation-side scale portion is configured to be mateable with the other long side of the base member so as to protrude.

6. The ruler according to claim 1, wherein the ruler is a square.

7. The base member is When the mating portion is mated with either end of the recess, a base point of the scale is provided at a position that overlaps with the long side of the mating portion.

7. The ruler according to claim 1, wherein the ruler is a square.

8. The base member is a first magnetic body embedded in the bottom surface of the recess in the longitudinal direction, The separating member is a magnet embedded in the mating portion; The separating member is When the engagement portion is engaged with the recess, the engagement portion is configured to be slidable while exerting the magnetic force of the magnet on the first magnetic body.

8. The ruler according to claim 1, wherein the ruler is a square.

9. The base member is a second magnetic body embedded in a position where the magnetic force of the magnet can reach when the separation-side scale portion is fitted in the recess.

9. The ruler according to claim 8.

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