Marking jig

Abstract

To provide a jig that can accurately and quickly mark a target component at a predetermined position. [Solution] The marking jig 1 comprises a jig body consisting of plate-shaped parts 11 and 12 that extend in directions substantially perpendicular to each other with respect to adjacent plate-shaped parts, and a locking part 13 joined to the end of the plate-shaped part for locking the end of the target member 2. Each plate-shaped part has two or more marking holes 14a to 14f that penetrate at a predetermined distance from the locking part, and when the locking part is locked to the end of the target member, the back surface of each plate-shaped part with a marking hole comes into contact with the outer surface of the target member.

Description

Technical Field

[0001] The present invention relates to a marking jig for quickly and accurately marking a position where an object is to be processed, for example, a position where a bolt hole is to be provided.

Background Art

[0002] For example, when installing or adding piping, usually the piping route cannot be freely set, and it is subject to the position of the existing piping to be connected, the environmental conditions of the newly piped location, and space constraints. Therefore, depending on the installation environment, etc., it is often impossible to let the piping crawl directly on the ground (such as the floor of a building or the upper floor of a building), and the piping route must be provided at a predetermined height. Also, due to the nature of the piping, it is not desirable for unnecessary height differences to occur from upstream to downstream. For this reason, when it is necessary to install the piping at a predetermined height, generally, a plurality of brackets as shown in FIG. 14 are installed at predetermined intervals under the piping. The example shown here is one where the piping H is placed on the bracket K and fixed with the U-bolt U. Not limited to this example, various types of piping brackets have been proposed, but those made by press processing are easy to manufacture but inferior in durability, so those made of steel materials such as angle steel are desirable. When made of steel, there are some that are integrally formed by welding, but welding takes time for production including pre-work, etc. In that regard, those that combine horizontal members and vertical members processed from steel and connect both with bolts and nuts can be assembled in a shorter time than welding and also have excellent earthquake resistance. As such a bracket, for example, there is one disclosed in Patent Document 1. The bracket can flexibly select and adjust the dimensions according to the situation at the site (for example, the piping installation location). Thereby, it is possible to assemble a bracket with a height and size corresponding to various environmental conditions and space constraints at the installation location in a short time.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

[0004] However, the mounting frame disclosed in Patent Document 1 requires pre-drilled bolt holes that will not actually be used in order to accommodate various installation location conditions. This is nothing more than unnecessary processing, resulting in wasted processing time and costs.

[0005] Therefore, the objective of this invention is to provide a marking jig that enables the rapid fabrication of a mounting frame tailored to the installation environment at the site. [Means for solving the problem]

[0006] To solve the above problems, the marking jig according to the present invention comprises a jig body consisting of a plurality of plate-like parts extending in directions substantially perpendicular to each other with respect to adjacent plate-like parts, where other plate-like parts are continuously joined to one side edge or both side edges of one plate-like part, and a locking part for locking the end of a target member, which is joined to the end of the plate-like part extending in a direction intersecting the direction of extension of the side edge of the plate-like part from the end edge position in the direction of extension of the side edge of the plate-like part, and each of at least two of the plurality of plate-like parts has two or more marking holes that penetrate at a predetermined distance from the locking part, and when the locking part is locked to the end of the target member, the inner surface of each plate-like part with the marking hole comes into contact with the outer surface of the target member. With this configuration, the back surfaces of each plate-shaped portion of the jig equipped with marking holes of the present invention come into contact with the outer surface of the target member, and the ends of the target member are locked into the locking portion of the jig of the present invention. This makes it possible to accurately mark the desired position to be marked, for example, the position where a bolt hole is to be drilled, without any misalignment. In other words, by simply placing the jig of the present invention over the target member and sliding the jig or the target member to lock the locking portion of the jig of the present invention into the end of the target member, it is possible to quickly and accurately mark a position a certain distance away from the end of the target member. [Effects of the Invention]

[0007] The marking jig according to this invention allows for accurate and quick marking of a target member from the end of the member where processing is to be performed, for example, where bolt holes should be made, to a predetermined desired position. This makes it possible to quickly prepare components for creating a frame that is tailored to the environmental conditions and space constraints of the installation site. As a result, it becomes possible to quickly manufacture a frame that is suited to the environmental conditions at the installation site (construction site), thereby shortening the construction period and reducing construction costs. [Brief explanation of the drawing]

[0008] [Figure 1]This is a perspective view of a marking jig according to one embodiment of the present invention. [Figure 2] This is a perspective view showing the relationship between the marking jig and the target member in this embodiment. [Figure 3] This is a perspective view showing how to use the marking jig in this embodiment. [Figure 4] (a) a front view and (b) a bottom view of a marking jig according to one embodiment of the present invention. [Figure 5] This is a perspective view of a marking jig according to one embodiment of the present invention, as seen from the rear side. [Figure 6] This is a perspective view from the rear of an example of a marking jig according to one embodiment of the present invention, in which the locking portion is transparent. [Figure 7] This is an example of a frame made using the marking jig of the present invention, where (a) is an overall view of the frame and (b) is a perspective view showing how the horizontal and vertical steel members are assembled inside the L-shaped steel members. [Figure 8] Figure 7 shows an example of a support structure, with (a) showing the completed state, (b) showing how each component is assembled, and (c) a perspective view of the completed state. [Figure 9] Figure 8 is a view from the rear, with (a) showing the arrangement of horizontal and vertical steel members, and (b) showing the state after adding L-shaped steel members. [Figure 10] This diagram illustrates the relationship between the position of the marking holes in a marking jig according to one embodiment of the present invention and the position of the bolt holes in the target member. [Figure 11] This figure shows another embodiment of the marking holes of the marking jig of the present invention. [Figure 12] This figure shows another example of the marking jig of the present invention, in which channel steel is used as the target member. [Figure 13] This figure shows a modified example of the locking portion of the marking jig of the present invention. [Figure 14] This figure shows an example of a conventional pipe support structure. [Modes for carrying out the invention]

[0009] The following describes the shape and usage of the marking jig of this invention, using the example of fabricating a frame using angle steel. In other words, the target member to be marked in this example is angle steel. However, this example is merely one embodiment, and this invention is not limited to this example but can be widely applied as a jig for marking various target members at predetermined desired positions.

[0010] Figure 1 is a diagram showing the overall shape of the marking jig 1 in this embodiment, and is a perspective view taken from the upper left. Figure 2 is a schematic diagram showing the relationship between the marking jig 1 and the target member (angle steel) 2 in this embodiment, and Figure 3 is a schematic diagram showing an overview of an example of how to use the marking jig 1. In Figure 3, the angle steel, which is the target member, is shown in a simplified shape with chamfers and radii omitted. Similarly, in the following figures, target members such as angle steel may also be shown in a simplified shape. As shown in Figures 2 and 3(b), the basic shape of the marking jig 1 for a target member is a similar shape that is slightly larger than the target member 2. A similar shape that is slightly larger means that when the marking jig 1 is placed over the target member 2 as shown in Figure 3(b), the size and shape are such that, for example, the outer surface of the target member 2 comes into contact with the inner surface of the jig 1. The marking jig 1 of this invention is provided with a locking portion 13 for locking the end portion 2b of the target member 2 on the jig body, and marking holes (14a, 14b, 14c, 14d, ...) at predetermined positions on the plate-shaped portion. Here, "outside" and "inside" refer to the side of the space enclosed by the two mutually orthogonal flanges 21 and 22 of the target member (angle steel) 2, where the inner angle is approximately 90 degrees, as the inside, and the opposite side as the outside. In other words, when the target member 2 is placed over the marking jig 1, the side of the space enclosed by the first plate-shaped portion 11, the second plate-shaped portion 12 and the locking portion 13 is the inside (may also be called the back surface of the plate-shaped portion), and the opposite side is the outside (may also be called the front surface of the plate-shaped portion).

[0011] The following outlines how to use the marking jig 1. As shown in Figures 3(a) and (b), the marking jig 1 is placed over the target member 2 so that the outer surfaces of the two flanges 21 and 22 of the target member align with the inner surfaces of the two plate-like parts 11 and 12 of the marking jig. The jig is then slid towards the locking part 13 until the end 2b of the target member 2 hits the locking part 13 of the marking jig 1 and it cannot move any further. As a result, the end 2b of the target member 2 is locked to the locking part 13 of the marking jig 1, as shown in Figure 3(b). In this state, by marking the target member with a writing instrument or the like through the marking holes (14a, 14b, 14c, 14d, ...), markings (M1, M2, M3, ...) can be accurately made at the desired locations on the target member 2, as shown in Figure 3(c). In Figure 3, the target member 2 is shown sliding longitudinally from a direction where the longitudinal locking portion 13 of the marking jig 1 is not provided. However, there is no problem in placing the marking jig 1 over the target member 2 from the side (right direction in the figure). In short, it is sufficient that the target member 2 fits snugly inside the marking jig 1, as shown in Figure 3(b), and that the end of the target member 2 is locked into the locking portion 13.

[0012] Next, the various parts of the marking jig 1 of this invention will be described. When the target member 2 is an angle steel, that is, when the shape of the target member 2 has two flanges (21, 22) that are perpendicular to each other, the shape of the marking jig 1 consists of two plate-like parts (first plate-like part 11, second plate-like part 12) that extend in directions substantially perpendicular to each other with adjacent plate-like parts, and the jig body to which the other plate-like part 12 is continuously joined to one side edge of one plate-like part 11, and the plate-like part end edge 11 extends from the end of the side edge 11a of the plate-like parts (11, 12) in the direction of extension, in a direction intersecting the direction of extension of the side edge 11a. The device comprises a locking portion 13 joined to b for locking the end portion 2b of the target member, and each of the two plate-like portions (11, 12) has two or more marking holes (14a, 14b, 14c, 14d, ...) that penetrate at a predetermined distance from the locking portion 13, and when the locking portion 13 is locked to the end portion of the target member 2, each of the plate-like portions (11, 12) with the marking holes (14a, 14b, 14c, 14d, ...) has a shape such that the inner surface of the plate-like portion abuts against the outer surface of the target member 2. Here, the marking holes (14a, 14b, 14c, 14d, ...) penetrate and open at predetermined positions on the target member 2 to be processed, for example, positions where bolt holes should be provided. With the above structure, when the target member 2 is placed over the jig 1 and slid in the longitudinal direction, the end portion 2b of the target member 2 comes into contact with the locking portion 13 of the jig, preventing further movement in that direction. In this locked state, each of the marking holes 14a, 14b, 14c, ... opens through the jig at a predetermined distance in the longitudinal direction from the locking portion 13 of the jig 1 (i.e., the position of the end portion 2b of the target member 2) at a predetermined position (corresponding to the position where bolt holes should be provided on the target member). Therefore, by inserting a writing instrument such as a pen into the marking hole in this locked state and marking the target member, it is possible to accurately identify the position where bolt holes should be provided.

[0013] According to the jig 1 of the present invention as described above, by covering the target member and aligning it so that the locking portion 13 locks to the end portion 2b of the target member, it is possible to quickly and accurately identify the position where the bolt hole of the target member should be drilled and perform marking. These operations, that is, the work flow of covering the jig on the target member and sliding it until it hits the locking portion and performing marking, can be completed quickly and in a short time as a series of operations. Therefore, it is possible to process a large number of angle steels in a short time. For this reason, at the construction site, the height and horizontal length of the gantry that match the conditions of each installation location are determined by surveying, the angle steels are cut to their respective lengths, marking is performed on each of the cut angle steels using the marking jig of the present invention, and bolt holes are drilled at the marked positions using a puncher, drill, etc. Then, it becomes possible to prepare the gantry materials required at the construction site in an extremely short time. After that, by combining the processed angle steels (vertical members, horizontal members) and fastening them with bolts, nuts, etc. to fabricate a gantry and fixing the piping using U-bolts, etc., the installation of the piping can be completed.

[0014] Next, we will explain the more specific manufacturing procedure for a frame, such as the frame 3 shown in Figure 7(a), which is made by processing angle steel. First, the size of the frame to be installed (height and horizontal length, etc.) is determined by on-site surveying, and the specifications of the angle steel are selected to match the frame to be manufactured. The angle steel is cut to the determined lengths to form vertical and horizontal steel members. In the case of the frame shown in Figure 7(a), the horizontal steel member 32 that horizontally connects the upper ends of the left and right vertical steel members 31, 31 can be made by, for example, placing an L-shaped steel member 33 over the connection between the vertical and horizontal steel members as shown in Figure 7 and fastening it with bolts and nuts. Figures 7(b), 8, and 9 are schematic diagrams showing examples of how the vertical and horizontal steel members and L-shaped steel members are assembled when manufacturing such a frame (bolt holes are omitted in Figures 8 and 9). Figure 7(b) shows how the vertical and horizontal steel members are assembled inside the L-shaped steel member 33, Figure 8 is a perspective view from the front, and Figure 9 is a perspective view from the rear. All of these are enlarged views of only the right side of the frame when viewed from the front for explanatory purposes. Figure 8(a) shows the assembled state, and (b) shows how each part is assembled. (c) shows how each part is assembled after assembly. Figure 9 is a view from the diagonal rear side, where (a) shows how the horizontal and vertical steel members are assembled, and (b) shows the state with the L-shaped steel members further stacked. In both Figures 9(a) and (b), the base is omitted. In this example, the horizontal steel members are assembled by placing them on top of the vertical members, but the vertical steel members may also be extended to the top and the horizontal steel members assembled from the side. Then, the L-shaped steel members are stacked on top of the frame corners where the horizontal and vertical steel members are joined and fastened with bolts and nuts. Similarly, the base 34 is placed on top of the lowest ends of each of the left and right vertical steel members and fastened with bolts and nuts to complete the frame.

[0015] When fabricating the pedestal in this manner, the vertical steel and the horizontal steel may be the same standard angle steel. For the L-shaped steel, it is efficient to prefabricate ones with a size slightly larger than the standard of the angle steel to be used, that is, a size that allows the vertical steel or the horizontal steel to be fitted inside. Also, it is desirable to pre-provide long holes at the positions for bolting as shown in Fig. 7 in the L-shaped steel in advance. According to such a method, by bringing several standard products of different sizes as angle steel and several types of L-shaped steel prefabricated to fit the prepared standard angle steel to the site, it is possible to fabricate an appropriate pedestal by processing the vertical steel and the horizontal steel on-site according to various on-site environmental conditions. An example of the specific fabrication procedure will be described. At the site, check the piping to be placed on the pedestal and select the standard of the angle steel to be used as the pedestal material. Then, for each pedestal to be installed, determine the size of the pedestal by surveying etc. while considering the environmental conditions of the installation location. Needless to say, once the height of the pedestal 3 is determined, the length of the required vertical steel 31 is determined, and once the width of the pedestal is determined, the length of the required horizontal steel 32 is determined. Depending on the environmental conditions of the installation location, there may be cases where the lengths of the left and right vertical steels cannot be made the same. According to the fabrication method using the marking jig of the present invention, even in such environmental conditions, the pedestal fabrication can proceed while appropriately adjusting on-site. Next, cut the angle steel to the determined length and prepare the required number of vertical steels and horizontal steels. Then, provide bolt holes in the vertical steel and the horizontal steel at positions corresponding to the bolt holes (long holes) provided in the pre-prepared L-shaped steel. After that, it is only necessary to fasten the bolts and nuts, and a pedestal suitable for the installation location can be assembled.

[0016] However, it is important to note that the bolt holes in the vertical and horizontal steel members must be drilled in precise positions. If the positions are misaligned, distortion will occur when the frame is assembled, and in severe cases, assembly itself may become impossible. For this reason, conventionally, after surveying at the construction site to determine the appropriate size (height and width) of the frame for the environment of the installation location, the data was taken back to the construction company's office to create a design drawing, and based on that, angle steel was processed (cut and bolt hole drilling) at a factory or similar facility to prepare the necessary vertical and horizontal steel members. Then, these processed parts were taken back to the construction site to assemble the frame. For this reason, when there were many frames to be installed or when the construction site was far away, it was difficult to complete the process from site surveying to frame installation in one day, and it often took several days. However, with the marking jig of this invention, it is possible to perform surveying on-site, process the angle steel (cutting and drilling bolt holes) on the spot, and then proceed directly to assembling the frame, making it entirely possible to complete the entire process from surveying to frame installation in a single day.

[0017] The marking jig 1 of this invention makes it possible to quickly and easily perform the task of precisely drilling bolt holes in angle steel materials at desired locations, which was previously difficult to complete on-site. This allows for the entire process, from surveying and processing of frame materials to assembly, to be carried out in one go on-site. Specifically, as described above, by placing the marking jig 1 of this invention over the target member (angle steel) and locking the locking part 13 of the jig 1 to one end 2b of the target member (angle steel), markings are made on the target member with a pen or the like through the marking holes 14a, 14b, etc., and the marked positions become the precise locations where bolt holes should be drilled. Since the positions for bolt hole processing are accurately and clearly identified by this marking, bolt holes can then be drilled at the marked positions using a puncher or drill, etc., without worrying about misalignment, and the assembly of the frame can proceed directly.

[0018] The following describes the desirable positions for providing bolt holes when assembling the frame as described above. In the case of the frame shown in Figure 7, the L-shaped steel section shown on the left side of the figure will be used as an example. In this example, the L-shaped steel section 33 has two elongated holes as bolt holes in both the horizontal and vertical sections. The positions of these elongated holes naturally correspond to the bolt holes of the horizontal steel section 32 or vertical steel section 31 that are fitted inside the L-shaped steel section, and correspond to the marking holes 14a, 14b, 14c, ... of the marking jig 1 of this invention. However, it should be noted that when a frame is made by combining a vertical steel section 31 and a horizontal steel section 32 as shown in Figures 7(b), 8, and 9, the bolt holes provided in the vertical steel section 31 and the bolt holes provided in the horizontal steel section 32 are at different distances from the ends of the angle steel. Specifically, in the example shown in Figure 10(b), the distance from the end 32t of the horizontal steel member 32 to the nearest bolt hole 32b1 is longer than the distance from the end 31t of the vertical steel member 31 to the nearest bolt hole 31b1. This positional relationship allows the bolt holes in the horizontal and vertical sections of the L-shaped steel member to be in the same position, thus enabling the use of the same L-shaped steel member for both the right and left sides. Furthermore, even when changing the arrangement of the vertical steel member 31 and the horizontal steel member 32, the same L-shaped steel member can be used (see also Figure 7(b)).

[0019] In order to accommodate cases where the distance from the end to the nearest bolt hole differs between the vertical steel member 31 and the horizontal steel member 32, it is desirable that the plate-shaped portion (11, 12) of the marking jig 1 of this invention be equipped with three or more marking holes, and include two or more sets of marking holes where the pitch between adjacent marking holes is the same. This allows for differentiation in usage, for example, when manufacturing a frame as shown in Figure 7, where marking of the vertical steel member 31 is performed using marking holes 14a and 14b, and marking of the horizontal steel member 32 is performed using marking holes 14b and 14c. The specific positional relationship of the marking holes provided in the jig 1 will now be explained. As shown in Figure 10(a), the adjacent marking holes 14a, 14b, and 14c provided in, for example, the first plate-shaped portion 11 of the marking jig 1 are each spaced apart by the same pitch α. In other words, the distance between 14a and 14b and the distance between 14b and 14c are both the same, α. The distance from the locking portion 13 to the nearest marking hole 14a is β, and α and β may be the same distance or different distances. For example, in the frame example shown in Figure 7, β can be set according to a suitable position for providing the bolt holes 31b1 of the vertical steel member 31 (a suitable position for fastening with bolts and nuts). Up to this point, the positional relationship of the marking holes in the longitudinal direction of the plate-like portion has been described, but the position of the bolt holes in the short direction of the plate-like portion may also be set to a position suitable for fastening with bolts and nuts. In other words, in the short direction, it is generally preferable to be near the center.

[0020] Figures 10(c) and (d) show the correspondence between the marking jig 1 and the marking positions on the vertical steel member 31 and the horizontal steel member 32. As explained above, in this example, the plate-shaped parts (11, 12) of the marking jig 1 are each provided with three or more marking holes. For the horizontal steel member 32, as shown in Figure 10(c), marking can be performed by passing the marking holes 14b and 14c (the second and third closest holes from the locking portion 3) in the first plate-shaped part 11 of the jig 1, thereby marking the positions on the horizontal steel member 32 that should be bolt holes 32b1 and 32b2. Similarly, the other flange of the horizontal steel member 32, which is not shown, can be marked by passing the marking holes 14e and 14f (the second and third closest holes from the locking portion 3) in the second plate-shaped part 12 of the jig 1. For the vertical steel member 31, marking can be performed through the marking holes 14d and 14e (the hole closest to the locking portion 3 and the second closest hole) in the second plate-shaped portion 12 of the jig 1, as shown in 10(d), thereby marking the positions where bolt holes 31b1 and 31b2 should be located on the vertical steel member 31. Similarly, for the other flange of the vertical steel member 31, which is not shown, marking can be performed through the marking holes 14a and 14b (the hole closest to the locking portion 3 and the second closest hole) in the first plate-shaped portion 11 of the jig 1. As a result, suitable positions for combining the vertical steel member 31 and the horizontal steel member 32, as shown in Figure 10(b), can be provided. Specifically, on the vertical steel member 31, bolt holes can be provided at positions 31b1 and 31b2, which are closer to the end, and on the horizontal steel member 32, bolt holes can be provided at positions 32b1 and 32b2, which are further from the end.

[0021] As described above, by arranging the marking holes (14a, 14b, 14c) of the marking jig 1 in the positional relationship shown in Figure 10(a), it becomes possible to handle both horizontal and vertical steel members with a single marking jig. Furthermore, when applying the marking jig 1 of this invention to the manufacture of structures other than frames, the position of the marking holes can be modified as shown in Figures 11(a) and (b). (a) is an example in which four marking holes are provided, with the same pitch α between adjacent marking holes. In this example, there are three sets of marking holes with the same pitch between adjacent marking holes. (b) is an example in which only the pitch α between 14a and 14b, and between 14c and 14d is the same, and the pitch γ between 14b and 14c is different. In this case, there are two sets of marking holes with the same pitch between adjacent marking holes.

[0022] The above describes the case where the target member is angle steel, but the marking jig of the present invention can also be applied to cases where the target member has other shapes. For example, an example of a marking jig when the target member is channel steel is shown in Figure 12. The marking jig in this case consists of three plate-like parts that extend in directions substantially perpendicular to each other with respect to adjacent plate-like parts, and the jig body is formed by continuously joining the other plate-like parts to one side edge or both side edges of one plate-like part, and a locking part is formed by joining the end of the plate-like part that extends from the end edge position in the direction of extension of the side edge of the plate-like part in a direction intersecting the direction of extension of the side edge, for locking the end of the target member, and each of the plate-like parts of the plurality of plate-like parts has two or more marking holes that penetrate at a predetermined distance from the locking part, and when the locking part is locked to the end of the target member, each of the plate-like parts with the marking holes has a shape in which the back surface of the plate-like part abuts against the outer surface of the target member. Even when the target component is channel steel, the method of using the marking jig is the same as in the case of angle steel described above.

[0023] A modified version of the marking jig of the present invention will now be described. In the marking jig described so far, the inner surfaces of the first plate-shaped part 11 and the second plate-shaped part 12 are provided so that they abut against the outer surfaces of the two flanges of the target member 2. When the marking jig is placed over the target member, if the outer surface of the target member and the inner surface of the marking jig are in contact, there is no risk of the marking position being shifted when marking through the marking hole, for example, due to the writing instrument being inserted at an angle. However, if the shape of the target member makes it difficult for the outer surface of the target member and the inner surface of the marking jig to physically contact, for example, if there is a protrusion on part of the surface, it is not necessary for them to be in contact. The point is that it is sufficient to be able to mark the correct position on the outer surface of the target member by passing the marking hole while the jig is placed over the target member. Accordingly, the marking jig of the present invention may have plate-like parts formed so that the target member can be housed in an internal space defined by the two or more plate-like parts, allowing marking to be made on the (outer surface) of the target member through the marking holes from the outside of the jig body. In this case, the marking holes can be adjusted to a size that reaches the target member straight ahead according to the shape of the pen tip of the writing instrument used, or a fold can be provided in the locking part to stabilize the position of the target member, and the shape of each part can be appropriately changed according to the properties of the target member.

[0024] Next, the details of each part of the jig 1 of this invention will be described. The first plate-shaped part 11 and the second plate-shaped part 12 are provided so that their inner surfaces abut against the outer surfaces of the two flanges of the target member 2. That is, the internal space defined by the first plate-shaped part 11 and the second plate-shaped part 12 is sized to completely accommodate the angle steel, which is the target member, and the cross-sections of the jig 1 and the target member 2 are similar in shape. There are no particular limitations on the thickness of the first plate-shaped part 11 and the second plate-shaped part 12, but it is preferable that the thickness is such that marking is easy to do through the marking hole and that the marking hole is easy to make. There are also no particular limitations on the material, and any material that is easy to handle depending on the target member may be used. Known materials such as steel and plastic can be used. Considering ease of marking, these thicknesses and materials should ideally have appropriate rigidity and thickness to prevent the marking position from shifting due to deformation of the plate-like portion during marking. Furthermore, since the process involves repeatedly placing and sliding the material over a large number of target components, it is preferable that the material be made of metal, which is durable against wear and tear.

[0025] In the embodiment shown in Figure 1, the locking portion 13 is a triangular plate shape that completely shields one of the longitudinal openings of the internal space defined by the first plate-shaped portion 11 and the second plate-shaped portion 12, but it is not limited to this shape. That is, the locking portion 13 only needs to be a shape that can lock onto the end of the target member and prevent the jig 1 from sliding further in the longitudinal direction. Figure 13 shows several modified shapes of the locking portion. In each, the gray part is the locking portion 13. (a) is a plate-shaped shape that shields the opening as described above. If the target member is angle steel, it will be a triangular plate shape as in (a), but if the target member is channel steel, it can be a rectangular plate shape. (b) is a mesh shape in the plate-shaped portion of (a). The mesh size can be selected as appropriate. (c) and (d) are shapes that shield only a part of the opening, rather than completely shielding the opening as in (a). (e) is an example where the locking part has a plate-like shape, and is a long plate shape with a width that can lock onto the target member. Also, (f) is an example where the locking part is made smaller and has a plate-like projection. Depending on the application, it is possible to select as appropriate, such as when it is desirable to reduce the weight of the marking jig, or when considering durability according to the magnitude of the force applied to the locking part depending on the material and size of the target member.

[0026] Furthermore, the cylindrical projection on the locking portion 13 shown in Figure 1, etc., has a through hole perpendicular to the height direction (the direction of protrusion), and by passing a string or the like through this through hole, the jig 1 can be hung on a hook on a wall or the like. In this way, it is also possible to add other functional members as long as they do not interfere with the marking function of the jig 1 of this invention. [Industrial applicability]

[0027] This invention is a jig that can accurately and quickly mark bolt holes in angle steel members of a frame. The jig of this invention is not limited to this, but can be widely applied in various fields to mark predetermined desired positions on target members. [Explanation of symbols]

[0028] 1. Marking jig 11 First plate-like part 12 Second plate-like part 13 Latch part 14 marking holes 2. Target Members 2b end 21, 22 flange 3. Stand 31 Vertical Steel 32 horizontal steel 33 L-shaped steel material

Claims

1. A jig for marking a predetermined position on a target member, The jig body consists of multiple plate-like parts extending in directions substantially perpendicular to each other, with one side edge or both side edges of one plate-like part being continuously joined to the other plate-like parts, The plate-like portion comprises a locking portion for locking the end of the target member, which is joined to the end of the plate-like portion that extends in a direction intersecting the direction of extension of the side edge of the plate-like portion, from the end edge position in the extending direction of the side edge of the plate-like portion, Each of at least two of the plurality of plate-like portions is provided with two or more marking holes that penetrate at a predetermined distance from the locking portion. When the locking portion is locked to the end of the target member, each of the plate-shaped portions having the marking hole has its back surface in contact with the outer surface of the target member. A marking jig characterized by the following features.

2. A jig for marking a predetermined position on a target member, A jig body having two or more plate-like portions extending in directions substantially perpendicular to each other, which are continuously joined at one or both edges in the shorter direction, The plate-like portion is joined to one of its longitudinal ends, which is the end of the plate-like portion, and comprises a locking portion for engaging with the end of the target member, At least two of the two or more plate-like portions are provided with two or more marking holes that penetrate the locking portion at a predetermined distance in the longitudinal direction from the locking portion. The jig body allows marking on the outer surface of the target member through the marking holes, and the target member can be housed in the internal space defined by the two or more plate-like portions. A marking jig characterized by the following features.

3. Each plate-like portion having the marking holes has three or more marking holes, and includes two or more sets of marking holes where the pitch between adjacent marking holes is the same. The marking jig according to claim 1 or 2.

4. The locking portion has a shape that extends in a direction perpendicular to the end of the plate-like portion. The marking jig according to claim 1 or 2.

5. The aforementioned locking portion is, The shape is such that it blocks the opening defined at the end of the two or more plate-like portions. The marking jig according to claim 1 or 2.

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