Scribing jig

Abstract

To provide a tool for scriber which is capable for easily performing operation of scribing a perpendicular bisector of a line connecting centers of two pore parts.SOLUTION: A tool 1 for scriber which is used when scribing a perpendicular bisector of a line connecting centers of two pore parts includes a first leg part 10, a second leg part 11 and a ruler part 30 of which one end parts are rotatably connected to one another, spherical tip members 20, 21 attached to the other end parts of the first leg part 10 and the second leg part 11, an angle adjustment part 40 which adjusts an angle between the first leg part 10 and the second leg part 11 and a ruler support part 50 which grips the ruler part 30 so that a center axis of the ruler part 30 matches with a bisector of an angle made by the first leg part 10 and the second leg part 11. In such a state that the tip members 20, 21 are arranged on the pore parts, centers of the tip members 20, 21 are located on a center axis of the pore parts, and the ruler part 30 has a missing part 31 which is missed up to the center axis of the ruler part 30 on a part of a lateral surface.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a marking jig used for marking flanges and the like, for marking the centers of two holes. [Background technology]

[0002] 2. Description of the Related Art Conventionally, when performing a machining operation, a marking operation is performed in which a line is drawn on a workpiece at a machining position.

[0003] Various jigs for use in marking work have been proposed in the past. According to Patent Document 1, a scribing tool has been proposed that has a first leg with a scribing needle on its tip edge, and a second leg with a pair of contact pieces on each side, each with a contact point facing downward on the tip edge and a profiling contact connected to it at an angle of approximately 90 degrees, with the other ends connected by a key pin, and when the contact point and the profiling contact are slid sideways while being lightly pressed against the flange surface and its edge, the scribing needle draws a beautiful pitch circle line.

[0004] Patent Document 2 proposes a compass with a sphere at the tip of one of its legs, which makes it possible to simply and easily mark a circle from the center of an already drilled hole in an object. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 10-44067 [Patent Document 2] Japanese Utility Model Application Publication No. 49-56600 Summary of the Invention [Problem to be solved by the invention]

[0006] However, when marking the center points of the lines connecting the centers of adjacent bolt holes formed around a central hole in a flange, it is not possible to mark the centers of the adjacent bolt holes. Here, using the compass described in Patent Document 2, it is possible to mark a perpendicular bisector passing through the center points of the lines connecting the centers of adjacent bolt holes by fitting spheres into adjacent holes and drawing arcs. For example, one possible approach would be to fit a compass sphere into each of the adjacent bolt holes, use the compass to draw arc-shaped auxiliary lines on the flange, and then accurately place a ruler at the intersection of the two arc-shaped auxiliary lines to mark the perpendicular bisector. However, this task requires precision, making it quite difficult for workers.

[0007] The present invention aims to solve such problems and provide a marking tool that can easily mark the center point of a line connecting the centers of two holes. [Means for solving the problem]

[0008] In order to achieve the above object, the present invention has the following configuration.

[0009] (1) A marking jig used to mark the center point of a line connecting the centers of two holes on the flat surface of an object having multiple holes, a first leg portion, a second leg portion, and a ruler portion, one end of which is pivotally connected to one another; a tip member having a rotating body shape attached to the other end of the first leg portion and the second leg portion and disposed in the hole portion; an angle adjustment unit that adjusts the angle between the first leg and the second leg; a ruler support portion that supports the ruler portion in a state where the central axis of the ruler portion extends in the direction of the bisector of the angle formed by the first leg portion and the second leg portion; When the tip member is placed in the hole, the central axis of the tip member coincides with the central axis of the hole, the ruler portion has a marking surface including a center line of the ruler portion on a part of a side surface, A marking jig in which, when the tip member is placed in the hole and the ruler portion is viewed in a plan view, the center line of the ruler portion and the bisector line coincide with each other.

[0010] According to (1), by supporting the ruler part on the ruler support part with the tip member fitted into the hole, the central axis of the ruler part extends in the direction of the bisector of the angle between the first leg and the second leg, and when the ruler part is viewed in plan, the scribing surface is positioned on the perpendicular bisector of the line joining the centers of the two holes. In this way, by simply adjusting the angle between the first leg and the second leg, fitting the tip member into the hole, and scribing along the scribing surface of the ruler part, it is possible to scribble a perpendicular bisector containing the center point of the line joining the centers of the two holes on an object.

[0011] (2) In (1), the tip member is a sphere, and the marking jig.

[0012] According to (2), because the tip member is spherical, when the tip member is fitted into the two holes, the center of the tip member is automatically positioned on the central axis of the two holes. Therefore, when the ruler part is viewed in plan, the marking surface can be positioned on the perpendicular bisector of the line connecting the centers of the two holes. This makes it possible to easily mark an object with a perpendicular bisector that includes the center point of the line connecting the centers of adjacent holes.

[0013] (3) In paragraphs (1) and (2), a support portion that grasps the first leg portion and the second leg portion and biases the tip members of the first leg portion and the second leg portion in a direction in which they open, the angle adjustment unit includes a shaft having a thread groove and a moving body that is threadedly engaged with the shaft and moves along the axial direction of the shaft by rotation, The shaft has one end rotatably attached to the inside of the first leg and the other end inserted into a hole formed in the second leg and extending to the outside of the second leg, and the movable body abuts against the outer surface of the second leg.

[0014] According to (3), with each rotation of the moving body, the moving body moves along the shaft by the pitch of the thread groove of the shaft. This makes it possible to finely adjust the spacing between the tip members, and ensure that the tip members fit securely into the two holes.

[0015] (4) In (1) to (3), The ruler support unit includes a pair of arms, one end of which is rotatably attached to the inside of the first leg unit and the second leg unit, and a positioning plate, which is rotatably attached to the other end of the pair of arms and on which the ruler unit is placed so as to be movable in the longitudinal direction of the ruler unit. a fixing mechanism that can switch between a fixed state in which the position of the positioning plate is fixed relative to the ruler portion and a released state in which the fixed state is released and the positioning plate is movable relative to the ruler portion, The positioning plate is a marking jig having a flat surface against which the back surface of the ruler portion abuts, and a pair of wall surfaces facing both side surfaces of the ruler portion.

[0016] According to (4), when the ruler part is placed on the positioning plate, the center line of the ruler part can be aligned with the bisector that bisects the angle between the first leg part and the second leg part.

[0017] (5) In (4), The marking surface of the ruler portion is formed on the other end side of the ruler portion relative to the positioning plate, The tip of the other end of the ruler portion is formed into an acute angle that becomes thinner toward the scribing surface, a marking jig.

[0018] According to (5), the direction in which the central axis of the ruler portion extends becomes easy to understand, and can be used as a reference for determining whether the tip member is securely fitted into the two hole portions.

[0019] (6) In paragraph (1) or (2), the ruler support unit has a pair of arms, one end of which is rotatably attached to the inside of the first leg unit and the second leg unit, and a cylindrical pillar-like portion that pivotally supports the other end of the pair of arms together so that the other end of the pair of arms can rotate freely; The ruler portion has a long hole extending in the longitudinal direction along a center line of the ruler portion, The diameter of the columnar portion is larger than the width of the slot, The tip of the columnar portion is insertable into the elongated hole, and has a pair of flat surfaces on the side surfaces of the tip portion that face each other and have a width approximately equal to the width of the elongated hole.

[0020] According to (6), by inserting the tip of the columnar part into the elongated hole of the ruler part, the tip can move along the elongated hole, and because the part of the tip of the columnar part other than the flat part is wider than the width of the elongated hole, the ruler part does not rotate relative to the tip of the columnar part. Furthermore, when the tip of the columnar part moves along the elongated hole, the pair of arms rotate so that they form the same angle with respect to the center line of the ruler part. Therefore, when the angle between the first leg and the second leg is adjusted, it is possible to align the center line of the ruler part with the bisector that bisects the angle between the first leg and the second leg.

[0021] (7) In paragraph (6), A marking jig in which a screw groove is formed on the arc-shaped side surface at the tip of the columnar portion, and the base portions of the pair of flat portions are formed in an arc shape. According to (7), when a nut, for example, is screwed onto the tip of the columnar part, the edge of the elongated hole in the ruler part abuts against the base of the arc-shaped flat part. This makes it possible to fix the ruler part to the tip of the columnar part and prevent the pair of arms from rotating relative to each other. This makes it possible to scribe on an object a perpendicular bisector containing the center point of the line connecting the centers of the two holes in the object, while maintaining the angle between the first leg and the second leg. [Effects of the Invention]

[0022] According to the present invention, it is possible to provide a marking jig that can easily perform the task of marking the perpendicular bisector of the line connecting the centers of two hole portions. [Brief explanation of the drawings]

[0023] [Figure 1] 1 is a front view showing the appearance of a scribing jig 1 according to an embodiment of the present invention. [Figure 2] 2 is a front view showing the appearance of the scribing jig 1 of FIG. 1 with a ruler part 30 removed. [Figure 3] 4 is an explanatory diagram showing the structure of a positioning plate 53. FIG. [Figure 4] 10 is an explanatory diagram showing how to use the marking jig 1 when marking a line toward the center on the flange 100. FIG. [Figure 5] 10 is an explanatory diagram showing how to use the marking jig 1 when marking a line toward the center on the flange 100. FIG. [Figure 6] 10 is an explanatory diagram showing another example of the tip members 20 and 21. FIG. [Figure 7] FIG. 10 is a front view showing the appearance of a scribing jig 2 according to another embodiment of the present invention. [Figure 8] FIG. 10 is a rear view showing the appearance of a scribing jig 2 according to another embodiment of the present invention. [Figure 9] 2 is an explanatory diagram showing the configuration of a ruler support part 50 of the scribing jig 2. FIG. [Figure 10] 10 is an explanatory diagram showing a modified example of the ruler support part 50 of the scribing jig 2. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0024] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0025] Fig. 1 is a front view showing the appearance of a scribing jig 1 according to one embodiment of the present invention, Fig. 2 is a front view showing the appearance of the scribing jig 1 of Fig. 1 with a ruler part 30 removed.

[0026] [Configuration of marking jig 1] As shown in Figure 1, the scribing jig 1 includes a first leg 10, a second leg 11, a support shaft 13, a C-ring 14, a knob portion 15, a tip member 20, a tip member 21, a ruler portion 30, an angle adjustment portion 40, and a ruler support portion 50.

[0027] The first leg 10 and the second leg 11 are made of long, rod-shaped members. The first leg 10 and the second leg 11 are roughly mirror-symmetrical. Recesses 10a and 11a are formed on the side of one end. The recesses 10a and 11a are columnar recesses with fan-shaped bottoms.

[0028] The support shaft 13 is made of a cylindrical member and has a radius equal to the radius of curvature of the recesses 10a and 11a. The support shaft 13 is inserted into a cylindrical hole formed by combining the recesses 10a and 11a, with the first leg 10 and the second leg 11 facing each other, with a portion missing. This allows the first leg 10 and the second leg 11 to rotate freely relative to each other with the support shaft 13 as the rotation axis.

[0029] The C-ring 14 is a component that is attached so as to sandwich one end of the mutually opposed first leg 10 and second leg 11 from the outside, connecting them together. The C-ring 14 has leaf spring properties and constantly urges one end of the first leg 10 and the second leg 11 to sandwich them. In other words, the C-ring 14 urges the other end of the first leg 10 and the second leg 11 to open.

[0030] The knob portion 15 is a cylindrical member fixed to the center of the outer side of the C-ring 14.

[0031] The tip member 20 is attached to the other end of the first leg 10, and the tip member 21 is attached to the other end of the second leg 11. According to this embodiment, the tip member 20 and the tip member 21 are made of spheres.

[0032] The ruler part 30 is a long member formed by cutting out a portion of a rectangular flat plate, with one end portion overlapping the first leg part 10 and the second leg part 11 and attached to the support shaft 13. The center line of the ruler part 30 in the longitudinal direction passes through the center point of one end face of the ruler part 30 in the longitudinal direction and is perpendicular to the center axis of the support shaft 13. The support shaft 13 may be fixed to the ruler part 30, or the support shaft 13 may be rotatable relative to the ruler part 30. It is also desirable that the ruler part 30 be a flat plate that is flexible in the vertical direction.

[0033] The ruler part 30 also has a notched part 31, which is a part of the side surface of the other end part. This notched part 31 is missing up to the center line of the ruler part 30. Therefore, the side surface of the ruler part 30 on the side of the notched part 31 is perpendicular to the plane of the ruler part 30, and the imaginary center line of this side surface passes through the center of the support shaft 13. Note that the side surface of the ruler part 30 on the side of the notched part 31 is the surface against which a marker or a magic marker is applied when marking with a marker or drawing an auxiliary line with a magic marker, and therefore will hereinafter be referred to as the scribing surface 32.

[0034] The tip of the other end of the ruler portion 30 is formed in an acute angle so that it becomes thinner toward the marking surface 32 side.

[0035] The angle adjustment unit 40 includes a shaft 41 having a thread groove, and a moving body 42 that is threaded onto the shaft 41 and moves along the axial direction of the shaft 41 when rotated. One end of the shaft 41 is rotatably attached to the inside of the first leg 10, and the other end is inserted into a hole (not shown) formed in the second leg 11 and extends to the outside of the second leg 11. The moving body 42 is disposed on the outside of the second leg 11, and by rotating the moving body 42, it is possible to move the moving body 42 by one pitch of the thread groove per rotation, and the moving body 42 can be brought into contact with the outer surface of the second leg 11.

[0036] In this state, the other ends of the first leg 10 and the second leg 11 tend to move in the opening direction due to the biasing force of the C-ring 14, but the movable body 42 restricts the opening movement of the first leg 10 and the second leg 11. Therefore, by moving the movable body 42 and changing the distance from one end of the shaft 41 to the movable body 42, it becomes possible to change the angle between the first leg 10 and the second leg 11, and the angle between the first leg 10 and the second leg 11 can be maintained by determining the position of the movable body 42.

[0037] The ruler support part 50 includes a pair of arm bodies 51 and 52, a positioning plate 53, a shaft 55 having a threaded groove, and a grip body 56.

[0038] Arm body 51 and arm body 52 are the same plate-shaped member, and one end of arm body 51 is rotatably attached to the inside of first leg 10. One end of arm body 52 is rotatably attached to the inside of second leg 11.

[0039] 3A is a perspective view, and 3B and 3C are front views showing the structure of positioning plate 53. Positioning plate 53 has a main body 53a made of a rectangular flat plate, and a guide portion 53b that is U-shaped in front view and has a rectangular flat top surface and wall surface portions extending at right angles from both ends of the top surface.

[0040] The upper surface of the guide portion 53b has two opposing sides that are shorter than the long sides of the main body portion 53a and two opposing sides that are the same length as the short sides of the main body portion 53a, and the wall portions extend at right angles from both ends of the upper surface, which are the same length as the short sides of the main body portion 53a. The length between the inner wall surfaces of the two wall portions is set to be longer than the width of the ruler portion 30. A slit 53c is formed in the center between the two wall portions on the upper surface of the guide portion 53b. This slit 53c extends parallel to the longitudinal direction of the wall portions.

[0041] The long sides of the main body 53a are set longer than the distance between the outer wall surfaces of both wall surfaces. The guide 53b is located in the center of the main body 53a, and the wall surfaces extend perpendicularly from the flat surface of the main body 53a. The longitudinal direction of the wall surfaces is parallel to the short sides of the main body 53a. Both longitudinal ends of the main body 53a extend laterally from the wall surfaces. Inside the guide 53b, a rectangular parallelepiped space is formed, surrounded by the inner surface of the guide 53b and the flat surface of the main body 53a.

[0042] In this embodiment, the width of the slit 53c is shorter than the width of the ruler portion 30, and the ruler portion 30 can be inserted through openings at the ends of both wall surfaces of the guide portion 53b, allowing the ruler portion 30 to be placed in the space inside the guide portion 53b. With the ruler portion 30 placed in the space inside the guide portion 53b, a gap is formed between the side surface of the ruler portion 30 and the inner wall surface of the guide portion 53b. Therefore, the ruler portion 30 can be moved slightly toward the inner wall surface inside the guide portion 53b.

[0043] The other ends of arm 51 and arm 52 are rotatably attached to both longitudinal ends of the rear surface of main body 53a. Specifically, circular holes 53f and 53g are formed on both longitudinal sides of main body 53a, and holes are also formed in the other ends of arm 51 and arm 52. By inserting a rotation shaft into holes 53f and 53g of main body 53a while aligning them with the holes in the other ends of arm 51 and arm 52, arm 51 and arm 52, they are rotatably attached.

[0044] A through hole having a thread groove is formed in the center of one of the two wall surface portions of guide portion 53b. For convenience of the following explanation, the inner surface of one wall surface portion will be referred to as inner wall surface 53d, and the inner surface of the other wall surface portion will be referred to as inner wall surface 53e.

[0045] One end of the shaft 55 is screwed into a through-hole in one wall surface of the guide part 53b from the outer wall surface side. The shaft 55 extends perpendicularly to the wall surface of the one wall surface of the guide part 53b, and when the shaft 55 is rotated, the one end can protrude from and retract into the center of the inner wall surface of the inner wall surface 53d.

[0046] As shown in Fig. 3(b), when the shaft 55 is rotated with the ruler portion 30 positioned inside the guide portion 53b, one end of the shaft 55 protrudes from the inner wall surface 53d, and the ruler portion 30 moves toward the inner wall surface 53e, and as shown in Fig. 3(c), the ruler portion 30 comes into close contact with the inner wall surface 53e. As a result, the ruler portion 30 is fixed to the guide portion 53b. In this state, when the ruler portion 30 and the positioning plate 53 are viewed from above, the perpendicular bisector connecting the rotation axis between the main body portion 53a and the arm body 51 and the rotation axis of the main body portion 53a and the arm body 52 coincides with the center line of the ruler portion 30.

[0047] In other words, the positions of the holes 53f and 53g are set so that the perpendicular bisector and the center line passing through the center of the ruler part 30 in the width direction coincide with each other.

[0048] The grip body 56 is a member in the shape of a rotating body that is thicker than the shaft 55. The grip body 56 is fixed to the other end of the shaft 55 so that the central axis of the grip body 56 coincides with the central axis of the shaft 55.

[0049] The angle adjustment part 40 and the ruler support part 50 are arranged in this order from the support shaft 13 toward the tip members 20 and 21. The ruler part 30 is arranged inside the guide part 53b. When the ruler part 30 is arranged inside the guide part 53b, the direction toward the base end of the ruler part 30, i.e., the support shaft 13 side, is referred to as the upper side, and the direction toward the tip end of the ruler part 30 is referred to as the lower side. The missing part 31 of the ruler part 30 is formed below the positioning plate 53.

[0050] [Operation of marking jig 1] The scribing jig 1 can adjust the distance between the center of the tip member 20 and the center of the tip member 21 by moving the movable body 42 and changing the distance from one end of the shaft 41 to the movable body 42, and also restrict the rotation of the first leg 10 and the second leg 11. When the distance between the center of the tip member 20 and the center of the tip member 21 changes, the positioning plate 53 moves up and down in conjunction with the change. Specifically, when the distance between the center of the tip member 20 and the center of the tip member 21 narrows, the positioning plate 53 moves downward, and when the distance between the center of the tip member 20 and the center of the tip member 21 widens, the positioning plate 53 moves upward.

[0051] Then, by operating the grip body 56 to rotate the shaft 55 and protruding the shaft 55 from the inner wall surface 53d, the side of the ruler part 30 can be kept pressed against the inner wall surface 53e. At the same time, the rotation of the ruler part 30 relative to the first leg part 10 and the second leg part 11 is restricted, and the position of the ruler part 30 is fixed.

[0052] When the ruler portion 30 is viewed from above, the center line of the ruler portion 30 coincides with the bisector that bisects the angle between the first leg portion 10 and the second leg portion 11. Furthermore, this bisector passes through the midpoint of the line connecting the center of the tip member 20 and the center of the tip member 21.

[0053] In particular, since the marking surface 32 of the ruler portion 30 includes the center line of the ruler portion 30, the line of the marking surface 32 when the ruler portion 30 is viewed in a plane coincides with the bisector that bisects the angle between the first leg portion 10 and the second leg portion 11.

[0054] [How to use scribing jig 1] The marking jig 1 is used to mark or draw an auxiliary line that passes through the center point of a line connecting the centers of two holes of the same diameter formed in an object and is perpendicular to this line.

[0055] Figures 4 and 5 are explanatory diagrams showing how to use the marking jig 1 when marking a line that passes through the center point of a line connecting the centers of two adjacent screw holes formed in the flange 100 and extends toward the center of the flange 100.

[0056] The flange 100 has a ring-shaped flat plate portion 101 and a cylindrical portion 102 that stands upright from a hole in the center of the flat plate portion 101. The flat plate portion 101 has four bolt holes 103. The centers of the four bolt holes 103 are equidistant from the center of the flat plate portion 101, and the angle between adjacent bolt holes 103, 103 and the center of the flat plate portion 101 is 90 degrees.

[0057] When performing the scribing work, the shaft 55 is rotated in advance to release the fixed state of the ruler part 30, and the positioning plate 53 is made movable along the ruler part 30.

[0058] Next, as shown in Figure 4, the movable body 42 is rotated to move the tip members 20, 21 toward the bolt holes 103, 103, and the distance between the first leg 10 and the second leg 11 is adjusted so that the tip members 20, 21 fit into the bolt holes 103, 103.

[0059] 5, after fitting the tip members 20 and 21 into the bolt holes 103, the shaft 55 is rotated to fix the ruler portion 30 to the positioning plate 53. In this state, the centers of the tip members 20 and 21 are positioned on the central axes of the bolt holes 103. Furthermore, the marking surface 32 of the ruler portion 30 extends in a direction perpendicular to the flat surface of the flat plate portion 101 and extends toward the center of the flat plate portion 101 along the perpendicular bisector of the line connecting the centers of adjacent bolt holes 103.

[0060] Therefore, by drawing a scribe line on the flat plate portion 101 along the scribe surface 32 of the ruler portion 30 using a scriber or magic marker, it is possible to draw a perpendicular bisector passing through the center of the line connecting the centers of adjacent bolt holes 103, 103 in the flat plate portion 101. In addition, by turning the scriber jig 1 180 degrees in a direction along the flat plate surface of the flat plate portion 101 (turning the scriber jig 1 upside down and swapping the tip members 20, 21 that fit into the bolt holes 103, 103), the scribe line overlaps with the scribe surface 32, making it possible to check whether the scribe line is accurate. Note that because the tip members 20, 21 of the scriber jig 1 are spherical, it can be used even if turned upside down, but it is preferable to use the side of the ruler portion 30 where the tip is closest to the surface to be scribed. In particular, because the ruler portion 30 is flexible, the tip of the ruler portion 30 can be brought into surface contact with the surface of the object to be marked, and this surface contact makes marking easier.

[0061] [Action and effect] According to this embodiment configured as described above, by the simple operation of fitting the tip members 20, 21 into the bolt holes 103, 103, it is possible to mark on the flange 100 a perpendicular bisector passing through the center point of the line connecting the centers of adjacent bolt holes 103, 103 among the four bolt holes 103 that the flange 100 has.

[0062] Furthermore, according to this embodiment, because the tip members 20, 21 are spherical, when the tip members 20, 21 are fitted into the bolt holes 103, 103, the centers of the tip members 20, 21 are automatically positioned on the central axes of the bolt holes 103, 103. Therefore, when the ruler part 30 is viewed in plan, the line of the marking surface 32 of the ruler part 30 coincides with the perpendicular bisector passing through the center point of the line connecting the centers of adjacent bolt holes 103, 103. This makes it possible to mark the perpendicular bisector passing through the center point of the line connecting the centers of adjacent bolt holes 103, 103 on the flange 100 with a simple operation.

[0063] Furthermore, according to this embodiment, the angle adjustment unit 40 has a shaft 41 having a thread groove, and a moving body 42 that is screwed onto the shaft 41 and moves along the axial direction of the shaft 41 as the shaft 41 rotates, and with each rotation of the moving body 42, it moves along the shaft 41 in units of the pitch of the thread groove of the shaft 41. This makes it possible to finely adjust the spacing between the tip members 20, 21, and enables the tip members 20, 21 to be reliably fitted into the bolt holes 103, 103.

[0064] Furthermore, according to this embodiment, the ruler support unit 50 has a pair of arms 51, 52, one end of which is rotatably attached to the inside of the first leg 10 and the second leg 11, and a positioning plate 53, which is rotatably attached to the other end of the pair of arms 51, 52 and on which the ruler unit 30 is placed so as to be movable in the longitudinal direction of the ruler unit 30. The back surface of the ruler unit 30 is placed on the flat surface of the main body 53a, and inner wall surfaces 53d, 53e face both side surfaces of the ruler unit 30. This restricts rotation of the ruler unit 30 relative to the first leg 10 and the second leg 11. Furthermore, the position of the positioning plate 53 relative to the ruler unit 30 can be fixed by rotating the shaft 55. This makes it possible to align the center line of the ruler portion 30 with the bisector that bisects the angle between the first leg 10 and the second leg 11 when the ruler portion 30 is placed on the positioning plate 53. Furthermore, when the tip members 20, 21 are fitted into the bolt holes 103, this bisector coincides with the perpendicular bisector of the line connecting the centers of the bolt holes 103. Therefore, by using a scriber to mark the flat portion 101 of the flange 100 along the marking surface 32, it is possible to mark a line that passes through the center point of the line connecting the centers of the bolt holes 103. Furthermore, because the extension of this line is theoretically perpendicular to the central axis of the cylindrical portion 102, the position of the central axis of the cylindrical portion 102 can be confirmed.

[0065] Furthermore, according to this embodiment, the tip of the ruler portion 30 is formed into an acute angle that becomes thinner toward the scribed surface 32. Therefore, when the tip members 20, 21 are securely fitted into the bolt holes 103, 103, the tip of the ruler portion 30 points toward the center of the flange 100, and can be used as a reference for determining whether the tip members 20, 21 are securely fitted into the bolt holes 103, 103.

[0066] Although the embodiments of the present invention have been described above, the embodiments of the present invention are not limited to the above-described embodiments. For example, according to the above-described embodiments, the tip members 20 and 21 are spherical. However, the shape is not limited to these and may be a solid of revolution such as an ellipse (rugby ball shape), a hemisphere, a cone, or a circular seat with the top of a cone missing. In this specification, a solid of revolution shape refers to a three-dimensional figure having at least a surface of revolution, and a surface of revolution refers to a curved surface obtained by rotating a curved line in space around an axis of a straight line in space. The tip members 20 and 21 do not need to be solid of revolution in their entirety; it is sufficient that a portion of the tip members, particularly the surface that abuts the edge of the bolt hole 103, is a surface of revolution. Therefore, even if the tip of a cone is cut obliquely with respect to its central axis, the solid of revolution shape of this embodiment is included as long as the surface that abuts the edge of the bolt hole 103 is a conical surface.

[0067] 6(a) and 6(b) are explanatory diagrams showing other examples of the tip members 20 and 21. FIG. 6(a) shows the tip members 20 and 21 having a conical shape and fitted into the bolt hole 103, and FIG. 6(b) shows the tip members 20 and 21 having a circular seat shape and fitted into the bolt hole 103. As shown in FIGS. 6(a) and 6(b), by making the tip members 20 and 21 conical or circular seat-shaped, it is possible to bring the side surfaces of the tip members 20 and 21 into close contact with the edge of the bolt hole 103, and it is possible to maintain the central axes of the tip members 20 and 21 aligned with the central axis of the bolt hole 103. The tip members 20 and 21 may be detachable from the ends of the first leg 10 and the second leg 11.

[0068] Furthermore, according to the above-described embodiment, the arm bodies 51, 52 are attached to the first leg 10 and the second leg 11 at one location, but it is also possible to provide multiple attachment locations for the arm bodies 51, 52 so that the positions of the arm bodies 51, 52 can be changed depending on the size of the flange 100.

[0069] In addition, multiple types of ruler portions 30 with different lengths may be prepared, and the ruler portion 30 may be replaced depending on the size of the flange 100, making it possible to select a ruler portion 30 with a length suitable for the flange 100.

[0070] Fig. 7 is a front view showing the appearance of a scribing jig 2 in another embodiment of the present invention. Fig. 8 is a rear view showing the appearance of a scribing jig 2 in another embodiment of the present invention. In the scribing jig 2 shown in Figs. 7 and 8, the same components or components with the same functions as those in the scribing jig 1 shown in Fig. 1 are designated by the same reference numerals, and detailed description thereof will be omitted.

[0071] The scribing jig 2 shown in Figures 7 and 8 differs from the scribing jig 1 shown in Figure 1 in the configuration of the ruler portion 30, tip members 20, 21, angle adjustment portion 40, and ruler support portion 50, and has eliminated the positioning plate 53, shaft 55, and grip body 56. The rest of the configuration is the same as the scribing jig 1 shown in Figure 1.

[0072] The ruler part 30 of the scribing jig 2 has a long hole 33 extending in the longitudinal direction along the center line on the surface of the ruler part 30. The long hole 33 is a through hole that penetrates the front and back surfaces of the ruler part 30.

[0073] The tip members 20 and 21 of the scribing jig 2 are formed in a hemispherical shape. The tip of the first leg 10 is fixed to the center of the circular plane of the tip member 20. Similarly, the tip of the second leg 11 is fixed to the center of the circular plane of the tip member 21.

[0074] The angle adjustment unit 40 of the scribing jig 2 includes a shaft 41, a moving body 42, and a protrusion 43. The shaft 41 and the moving body 42 are the same as the shaft 41 and the moving body 42 of the scribing jig 1 shown in Figure 1, so detailed description will be omitted.

[0075] The protrusions 43 are cylindrical members erected between the base ends of the first leg 10 and the second leg 11 and one end of the arm bodies 51 and 52, respectively. The ruler part 30 and the ruler support part 50 are arranged on one surface of the first leg 10 and the second leg 11, and the protrusions 43 extend perpendicularly from the other surface on the opposite side. Each of the protrusions 43 has a through-hole (not shown) extending radially from a part of its side surface through the center to the opposite surface. The shaft 41 is passed through the through-holes of the protrusions 43 of the first leg 10 and the second leg 11, and its tip is fixed to the protrusion 43 erected on the first leg 10 by welding or the like. The moving body 42 is arranged to the side of the protrusion of the second leg 11.

[0076] Then, when the movable body 42 moves and presses the protrusion 43 of the second leg 11, the tip members 20, 21 move, making it possible to adjust the distance between them. With this configuration, the shaft 41 and the movable body 42 are positioned at a location that is vertically separated from the ruler part 30, making it easy to operate the movable body 42 with the ruler part 30 close to the object to be marked.

[0077] Figure 9 is an explanatory diagram showing the configuration of the ruler support part 50 of the scribing jig 2, where Figure 9(a) is a cross-sectional view taken along line AA in Figure 7, and Figure 9(b) is an exploded view of Figure 9(a) divided into individual parts.

[0078] The ruler support part 50 of the scribing jig 2 includes a pair of arm bodies 51 and 52, a bolt 60, and a nut 61.

[0079] The pair of arms 51 and 52 shown in FIG. 9 are longer than the pair of arms 51 and 52 shown in FIG.

[0080] Thin portions 51a, 52a are formed at the other ends of the arm bodies 51, 52. The thin portion 51a of the arm body 51 is formed by cutting out the underside of the other end of the arm body 51, and a step is formed between the underside of the arm body 51 and the underside of the thin portion 51a. The thin portion 52a of the arm body 52 is formed by cutting out the upper side of the other end of the arm body 52, and a step is formed between the upper surface of the arm body 52 and the upper surface of the thin portion 52a. Holes 51b, 52b are formed in the centers of the thin portions 51a, 52a. Hole 51b and hole 52b are circular holes of the same diameter.

[0081] When the lower surface of the thin-walled portion 51a of the arm body 51 and the upper surface of the thin-walled portion 52a of the arm body 52 are abutted against each other so that the central axis of the hole portion 51b and the central axis of the hole portion 52b coincide, the upper surfaces of the arm bodies 51 and 52 are included in the same virtual plane, and the lower surfaces of the arm bodies 51 and 52 are included in the same virtual plane.

[0082] The bolt 60 is composed of a head 60a and a shaft 60b. The head 60a is a columnar body having a bottom surface that can cover the holes 51b and 52b and part of the surrounding area.

[0083] The shaft portion 60b is a cylindrical body extending perpendicularly from the bottom surface of the head portion 60a. The shaft portion 60b has a cylindrical portion 60c extending from the bottom surface of the head portion 60a and not having threads, and an oval portion 60e extending continuously from the cylindrical portion 60c, with flat portions 60d formed on both sides of the cylindrical portion 60c and an oval-shaped columnar portion 60e with an oval-shaped bottom surface. In other words, the oval portion 60e is formed at the tip of the shaft portion 60b. The base portion of the flat portion 60d, i.e., the corner 60f where the plane of the flat portion 60d and the top surface of the cylindrical portion 60c meet, is formed in an arc shape.

[0084] The height of the cylindrical portion 60c is set to the sum of the heights of the hole 51b and the hole 52b. The length of the oval portion 60e is set to be equal to or greater than the thickness of the ruler portion 30. The length between the two flat portions 60d, 60d of the oval portion 60e is set to the width of the elongated hole 33. Therefore, by orienting the longitudinal direction of the bottom surface of the oval portion 60e in a direction along the central axis of the ruler portion 30, the oval portion 60e can be inserted into the elongated hole 33. Note that a screw thread is formed on the side surface of the oval portion 60e other than the flat portions 60d, 60d, i.e., the arc-shaped side surface. The cylindrical portion 60c can be inserted into the hole 51b and the hole 52b, and the oval portion 60e can be inserted into the elongated hole 33 but cannot be inserted into the cylindrical portion 60c.

[0085] Then, arm bodies 51 and 52 are combined so that the central axes of hole 52b and hole 51b are aligned, and bolt 60 is inserted through hole 52b. As a result, the other ends of arm bodies 51 and 52 are pivotally supported by bolt 60, and the other ends of arm bodies 51 and 52 can rotate freely around cylindrical portion 60c of bolt 60 as an axis.

[0086] The ruler 30 is placed on the other end of the arm 51 from above, and the oblong portion 60e is inserted into the elongated hole 33. At this time, the tip of the oval portion 60e protrudes from the ruler 30. Then, the nut 61 is screwed onto the oval portion 60e protruding from the ruler 30. As a result, the arc-shaped corner 60f abuts against the edge of the elongated hole 33. When the nut 61 is tightened, the ruler 30 moves along the corner 60f, and the center line of the ruler 30 moves toward the center axis of the elongated hole 33. In conjunction with this, the arm 51, 52 rotate so that they form the same angle with respect to the center line of the ruler 30. As a result, the center line of the ruler 30 can be aligned with the bisector that bisects the angle between the first leg 10 and the second leg 11.

[0087] 4 and 5, the scribing jig 2 can perform scribing by rotating the movable body 42 to adjust the distance between the tip members 20, 21 and then tightening the nut 61 to fix the ruler portion 30 to the other end of the arm bodies 51, 52. Specifically, after rotating the movable body 42 to adjust the distance between the tip members 20, 21, tightening the nut 61 causes the edge of the elongated hole 33 in the ruler portion 30 to abut against the base of the arc-shaped flat portions 60d, 60d, i.e., the corner portion 60f. This makes it possible to fix the ruler portion 30 to the tip of the bolt 60, preventing the pair of arm bodies 51, 52 from rotating relative to each other.

[0088] According to this other embodiment configured as described above, the positioning plate 53, shaft 55, and grip body 56 of the embodiment shown in FIG. 1 are omitted, thereby making it possible to omit components accordingly. Furthermore, the oval portion 60e is inserted into the elongated hole 33, the diameter of the cylindrical portion of the oval portion 60e is larger than the width of the elongated hole 33, and the arc-shaped corner 60f abuts against the edge of the elongated hole 33. Therefore, when the nut 61 is tightened, the ruler portion 30 moves along the corner 60f, and the center line of the ruler portion 30 moves toward the central axis of the elongated hole 33, and the ruler portion 30 is fixed to the other end of the arm bodies 51, 52. This allows the first leg 10, the second leg 11, and the arm bodies 51, 52 to rotate so that the perpendicular bisector of the line connecting the centers of the tip members 20, 21 coincides with the central axis of the ruler portion 30, enabling accurate marking.

[0089] According to another embodiment, the ruler portion 30 may be fixed by threading a thumbscrew 62 into the oval portion 60e as shown in Fig. 10, instead of the nut 61. It goes without saying that at least one of the ruler portion 30, tip members 20, 21, angle adjustment portion 40, and ruler support portion 50 of the scribing jig 2 shown in Figs. 7 to 10 may be applied to the scribing jig 1 shown in Figs. 1 to 6.

[0090] It should be noted that within the scope of the concept of the present invention, those skilled in the art may conceive of various modifications and alterations. Therefore, it is understood that such modifications and alterations fall within the scope of the present invention. For example, even if a person skilled in the art appropriately adds, deletes, or modifies components of the above-described embodiment, or adds, omits, or modifies the conditions of a process, such modifications are also included within the scope of the present invention as long as they maintain the gist of the present invention. [Explanation of symbols]

[0091] 1. Marking jig 10 First Leg 10a Recess 11 Second leg 11a Recess 13 Support shaft 14 C-ring 15 Knob section 20, 21 Tip member 30 Ruler 31 Missing part 40 Angle adjustment section 41 Shaft 42 Mobile 43 Protrusion 50 Ruler support part 51, 52 Arm body 51a, 52a Thin wall part 51b, 52b hole 53 Positioning plate 53a Main body 53d, 53e Inner wall 53f, 53g, 53h, 53i holes 55 shaft 56 Grip body 60 volts 60a Head 60b Shaft 60c cylindrical section 60d flat part 60e Oval section 60f Corner 61 Nut 62 Thumb screw 100 flange 101 Flat plate part 102 Cylindrical part 103 Bolt holes

Claims

1. A marking jig used to mark the center point of a line connecting the centers of two holes on a flat surface of an object having a plurality of holes, a first leg portion, a second leg portion, and a ruler portion, one end of which is pivotally connected to one another; a tip member having a rotating body shape attached to the other end of the first leg portion and the second leg portion and disposed in the hole portion; an angle adjustment unit that adjusts the angle between the first leg and the second leg; a ruler support portion that supports the ruler portion in a state where the central axis of the ruler portion extends in the direction of the bisector of the angle formed by the first leg portion and the second leg portion; When the tip member is placed in the hole, the central axis of the tip member coincides with the central axis of the hole, the ruler portion has a marking surface including a center line of the ruler portion on a part of a side surface, A marking jig in which, when the tip member is placed in the hole and the ruler portion is viewed in a plan view, the center line of the ruler portion and the bisector line coincide with each other.

2. The scribing jig according to claim 1, The tip member is a sphere, and the scribing jig.

3. The scribing jig according to claim 1 or 2, a support portion that grips the first leg portion and the second leg portion and biases the tip members of the first leg portion and the second leg portion in a direction in which they open, the angle adjustment unit includes a shaft having a thread groove and a moving body that is threadedly engaged with the shaft and moves along the axial direction of the shaft by rotation, The shaft has one end rotatably attached to the inside of the first leg and the other end inserted into a hole formed in the second leg and extending to the outside of the second leg, and the movable body abuts against the outer surface of the second leg.

4. The scribing jig according to claim 1 or 2, The ruler support unit includes a pair of arms, one end of which is rotatably attached to the inside of the first leg unit and the second leg unit, and a positioning plate, which is rotatably attached to the other end of the pair of arms and on which the ruler unit is placed so as to be movable in the longitudinal direction of the ruler unit. a fixing mechanism that can switch between a fixed state in which the position of the positioning plate is fixed relative to the ruler portion and a released state in which the fixed state is released and the positioning plate is movable relative to the ruler portion, The positioning plate is a marking jig having a flat surface against which the back surface of the ruler portion abuts, and a pair of wall surfaces facing both side surfaces of the ruler portion.

5. The scribing jig according to claim 4, The marking surface of the ruler portion is formed on the other end side of the ruler portion relative to the pair of gripping plates, The tip of the other end of the ruler portion is formed into an acute angle that becomes thinner toward the scribing surface, a marking jig.

6. The scribing jig according to claim 1 or 2, the ruler support unit has a pair of arms, one end of which is rotatably attached to the inside of the first leg unit and the second leg unit, and a cylindrical pillar-like portion that pivotally supports the other end of the pair of arms, The ruler portion has a long hole extending in the longitudinal direction along a center line of the ruler portion, The diameter of the columnar portion is larger than the width of the slot, The tip of the columnar portion is insertable into the elongated hole, and has a pair of flat surfaces on the side surfaces of the tip portion that face each other and have a width approximately equal to the width of the elongated hole.

7. The scribing jig according to claim 6, A marking jig in which a screw groove is formed on the arc-shaped side surface at the tip of the columnar portion, and the base portions of the pair of flat portions are formed in an arc shape.

Images