Target Fixture

Abstract

To provide a target fixing tool that can be easily and accurately mounted by anyone in a short time, can be mounted even in a shallow hole, has a compact size as a whole, and is easy to carry.SOLUTION: A target fixing tool 1 for fixing to a hole a target (label T) for measuring the center position of the hole includes: a pivot shaft 2 made of a bar stock or pipe material; a shaft fixing plate 3 that supports and fixes the pivot shaft 2 so as to be orthogonal to the plate surface; the target (label T) attached to the shaft fixing plate 3; a plurality of wing members 6, 6 whose tips are evenly radially spread or closed with respect to the pivot shaft 2 by oscillating; and a wing link mechanism 4 that oscillates the plurality of wing members 6, 6 in conjunction with each other. The wing link mechanism 4 is provided with a rotatable wing turning handle attached to the pivot shaft 2. The plurality of wing members 6, 6 are oscillated in conjunction with the rotation of the wing turning handle.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a target fixing jig that fixes a target in a hole for measuring the center position of the hole. [Background technology]

[0002] In order to replace old-standard bearings with larger shoe bearings that meet new standards, to install horizontal force distribution structures that restrain horizontal displacement, and to retrofit bridge collapse prevention devices, steel brackets are used to expand the upper surface space of bridge substructures such as abutments. These retrofit steel brackets are attached by drilling anchor holes in the existing reinforced concrete substructure and using post-installed anchors. At this time, since the exact position of the reinforcing bars in the existing substructure is not known, if the drilled anchor holes come into contact with the reinforcing bars, they are drilled again in a nearby position to avoid the contact. Finally, the center position of the drilled holes is measured, and steel brackets are manufactured in a factory according to the anchor holes, and after completion, they are attached to the on-site abutments.

[0003] For this reason, it is necessary to accurately measure the center position of the hole drilled in the substructure of the bridge, and in the past, this was measured by tracing it onto a sheet or the like. However, for a concrete structure that is not smooth, tracing it from its vertical side is difficult and time-consuming, and there is a problem that it may be misaligned and not be possible to measure accurately. Therefore, in recent years, it has become common to place a target marked with a specified pattern at the center position of the anchor hole, photograph it with a digital camera, etc., and then process the photographed image by computer to measure it.

[0004] However, as mentioned above, the sides of concrete structures are not smooth, and there was a problem in that it was difficult to accurately install a target at the center of an anchor hole, which is not necessarily a perfect circle, especially on the vertical or inclined surfaces of a substructure that has deteriorated over time.

[0005] In order to solve such problems, Patent Document 1 discloses a target mounting member consisting of a support rod 1 having a predetermined length, two or more leg spreading devices 2 that are spaced apart on the support rod 1 and open leg spreading arms 23 like an umbrella, and a target plate 32 provided on the end of the support rod 1 (see claim 1 in the claims of Patent Document 1, paragraphs

[0016] to

[0021] of the specification, Figures 1 and 2 of the drawings, etc.).

[0006] However, the target mounting member described in Patent Document 1 pushes open and fixes the leg-spreading arms 23 having a predetermined length, so a certain hole depth is required for just one leg-spreading device 2, and moreover, multiple leg-spreading devices 2 must be provided at intervals. For this reason, there was a problem that while it can be applied to holes that are deeper than a certain depth, such as anchor holes, it cannot be applied to holes that are shallow. There was also a problem that it could not be fixed well if reinforcing bars or aggregates protruded in the middle of the anchor hole.

[0007] Furthermore, the target mounting member described in Patent Document 1 is configured so that the leg-spreading arms 23 open when the retaining sleeve 4 that holds the spring member 25 that biases the leg-spreading arms 23 to open is removed. This not only makes it difficult to insert the target mounting member into the anchor hole, but also poses the problem of poor work efficiency, as the target mounting member needs to be pulled out of the hole when redoing or making fine adjustments.

[0008] Furthermore, the target mounting member described in Patent Document 1 requires each of the multiple leg-spreading devices 2, 2, 2 to be opened individually, which is not only time-consuming but also poses the problem that the target cannot be properly fixed if any of the leg-spreading devices 2 are not opened sufficiently.

[0009] Furthermore, as described in Non-Patent Document 1, the target mounting member described in Patent Document 1 is designed to be made entirely of metal, and moreover, multiple leg spreaders 2 are required to mount it in one hole. Therefore, if one were to attempt to measure the anchor holes required for mounting a steel bracket from a single image, a target mounting member that is too heavy to be carried by one person would be required, and this also posed a problem of poor work efficiency. [Prior art documents] [Patent documents]

[0010] [Patent Document 1] JP 2019-157378 A [Non-patent literature]

[0011] [Non-Patent Document 1] "New Technology Information System" [online], [Retrieved February 22, 2021], Internet,<URL:https: / / www.netis.mlit.go.jp / netis / pubsearch / details?regNo=QS-180029%20> Summary of the Invention [Problem to be solved by the invention]

[0012] The present invention has been devised in consideration of the above-mentioned problems, and its object is to provide a target fixing jig that can be easily and accurately installed by anyone in a short time, can be installed even in shallow holes, and is compact in size overall and easy to carry. [Means for solving the problem]

[0013] The target fixing jig described in claim 1 is a target fixing jig for fixing a target in a hole for measuring the center position of the hole, and comprises a pivot shaft made of rod or tube material, a shaft fixing plate for supporting and fixing the pivot shaft so that it is perpendicular to the plate surface, the target attached to the shaft fixing plate, a plurality of wing members whose tips expand or close evenly radially relative to the pivot shaft when swung, and a wing link mechanism that swung these plurality of wing members in conjunction with each other, wherein the wing link mechanism has a rotatable wing handle attached to the pivot shaft, and the plurality of wing members swung in conjunction with the rotation of the wing movable handle.

[0014] The target fixing jig described in claim 2 is the target fixing jig described in claim 1, further comprising a spring material that biases the multiple wing members in a direction in which they spread, and a spring lock handle having one end fixed to the spring material and attached to the pivot shaft via a ratchet mechanism.

[0015] A target fixing jig described in claim 3 is the target fixing jig described in claim 1 or 2, characterized in that a plurality of the wing link mechanisms are attached to the pivot shaft.

[0016] The target fixing jig described in claim 4 is the target fixing jig described in claim 3, wherein the multiple wing link mechanisms are attached to the pivot shaft at a distance via a spacer member. Effect of the Invention

[0017] According to the inventions of claims 1 to 4, the multiple wing members swing in conjunction with the rotation of the wing movable handle and open or close evenly and steplessly with respect to the pivot shaft, so that the wing members do not end up not fully opening, and anyone can easily and quickly mount the target accurately at the center of the hole by simply manually rotating the wing movable handle. In addition, since the target fixing jig is fixed by multiple wing members that are linked to the rotation of the wing movable handle, it is a jig with a short depth, can be mounted in shallow holes, and can be made compact in size overall. Therefore, it is easy for one person to carry multiple target fixing jigs, and one person can carry target fixing jigs for multiple holes required for mounting brackets, etc. at once.

[0018] In particular, according to the invention of claim 2, the target fixing jig can be attached to the hole by the spring force appropriately biased by the ratchet mechanism, and the target can be attached accurately to the center position of the hole more easily and in a short time.

[0019] In particular, according to the invention as defined in claims 3 and 4, the target fixing jig can be fixed in the hole at a plurality of points, and the target can be fixed in the hole more stably. [Brief description of the drawings]

[0020] [Figure 1] FIG. 1 is a perspective view showing a target fixing jig according to a first embodiment of the present invention. [Diagram 2] FIG. 2 is an exploded perspective view showing the target fixing jig. [Diagram 3] FIG. 3 is a side view showing the target fixing jig. [Figure 4] FIG. 4 is a schematic cross-sectional view taken along the axial direction and showing a schematic configuration of the target fixing jig. [Diagram 5] FIG. 5 is a front view showing a front plate of a shaft fixing plate of the target fixing jig. [Figure 6]FIG. 6 is a front view showing a ratchet plate of the shaft fixing plate of the same. [Figure 7] FIG. 7(a) is a front view showing a spring lock handle of an operating handle portion of the target fixing jig, and FIG. 7(b) is a front view showing a latch piece of the spring lock handle. [Figure 8] FIG. 8 is a front view showing a wing movable handle of the operating handle portion of the above. [Figure 9] FIG. 9(a) is a front view showing a first wing member, FIG. 9(b) is a front view showing a second wing member, and FIG. 9(c) is a front view showing the first wing member and the second wing member connected together. [Figure 10] FIG. 10 is a diagram showing the swinging motion of the wing member of the same device, in which (a) shows the state in which the wing member is expanded to fit a hole with a diameter of 32 mm, (b) shows the state in which it is aligned to a hole with a diameter of 45 mm, and (c) shows the state in which it is aligned to a hole with a diameter of 62 mm. [Figure 11] FIG. 11 is a perspective view showing the above wing member in an open state. [Figure 12] FIG. 12 is a side view showing a target fixing jig according to the second embodiment of the present invention. [Figure 13] FIG. 13 is a side view showing a target fixing jig according to the third embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A target fixing jig according to an embodiment of the present invention will be described in detail below with reference to the drawings.

[0022] [First embodiment] A target fixing jig 1 according to a first embodiment of the present invention will be described with reference to Figs. 1 to 11. The target fixing jig 1 is intended to be used for fixing the target fixing jig 1 to a circular hole drilled in a concrete structure such as a bridge abutment, taking a photograph with a digital camera, and measuring the center position of the drilled hole by computer processing. Fig. 1 is a perspective view showing the target fixing jig 1 according to the first embodiment of the present invention, and Fig. 2 is a side view showing the target fixing jig 1. Fig. 3 is an exploded perspective view showing the target fixing jig 1, and Fig. 4 is a schematic cross-sectional view cut along the axial direction which shows the configuration of the target fixing jig 1 with some parts omitted.

[0023] As shown in Figures 1 to 4, the target fixing jig 1 is composed of a pivot shaft 2 made of a rod or tube material, a shaft fixing plate 3 that supports and fixes the pivot shaft 2 so that it is perpendicular to the plate surface, and a wing link mechanism 4 that is attached to the pivot shaft 2 and swings a plurality of wing members 6 (described below) in conjunction with each other.

[0024] (Pivot shaft) The pivot shaft 2 is a metal bar or tube such as a steel rod or steel pipe, and is a basic member that is installed in the center of the hole where the shaft core is attached and serves as the axis of rotation and swing motion. Of course, it can be made of a non-metallic material such as resin as long as it has the durability and strength to withstand impact loads such as a drop.

[0025] 4, hat-shaped shaft holders 21, 22 made of resin such as acrylic resin (PMMA) are fixed to both longitudinal ends of the pivot shaft 2 by screws, adhesives, etc. These shaft holders 21, 22 are fixed so that the brim-like part that protrudes outward from the pivot shaft faces the front side, both for shaft holder 21 on the front side (surface side of the concrete structure) and shaft holder 22 on the back side.

[0026] (Axis fixing plate) 4, the shaft fixing plate 3 is made of two transparent resin plates such as acrylic resin (PMMA) with a light transmittance of over 80%, and is fixed non-rotatably to the front end faces of the shaft holder 21 and the pivot shaft 2. The shaft fixing plate 3 is a plate for mounting a target indicator T on which a target pattern for measuring the center position of a hole is displayed.

[0027] This shaft fixing plate 3 is composed of a front plate 31 shown in Fig. 5 and a ratchet plate 32 shown in Fig. 6, and these plates are mechanically joined together by connecting members such as bolts and rivets (not shown). Of course, these plates may be joined together by adhesive or thermal welding. Fig. 5 is a front view showing the front plate 31 of the shaft fixing plate 3, and Fig. 6 is a front view showing the ratchet plate 32 of the shaft fixing plate 3.

[0028] ((Front Plate)) 5, the front plate 31 has a disk-shaped plate body 310 and finger hole portions 311 protruding outward from the circumferential outer surface of the plate body 310. Four bolt holes 312 are drilled in the plate body 310 to accommodate bolt heads of connecting members for connecting the shaft fixing plate 3 and the shaft holder 21. In addition, the plate body 310 has crosshairs 313 marked with a laser beam. The crosshairs 313 intersect at the center point of the disk of the plate body 310.

[0029] The finger hole portion 311 is a portion in which two finger holes 314, 314 are formed, and is a portion in which fingers are inserted into these two finger holes 314, 314 to hold the target fixing jig 1. Furthermore, the finger hole portion 311 is formed with two connecting holes 315 through which connecting members that connect the front plate 31 and the ratchet plate 32 are inserted.

[0030] 1, a target indicator T is attached to the surface of the front plate 31. However, the target indicator T may be interposed between the front plate 31 and a ratchet plate 32 described later. In short, it is sufficient that the target indicator T is attached so as to be visible or photographable from the front side of the front plate 31. Furthermore, since a crosshair 313 is formed on the front plate 31, the center of the target indicator T can be accurately attached to the axis of the pivot shaft 2 of the target fixing jig 1.

[0031] As shown in Fig. 1, the target indication T is printed with a circular mark called a RAD (Ringed Automatically Detected) target for automatically measuring the center position of the target by image processing the photographed data taken by a digital camera by a computer. Also, these target indications T all have different marks in parts so that multiple target indications T can be photographed at once and numbered automatically. Of course, it goes without saying that the target is not limited to a RAD target as long as the center position can be automatically measured by image processing of a computer from the photographed data.

[0032] ((Ratchet plate)) 6, ratchet plate 32 has a generally disk-shaped plate body 320 and finger hole portions 321 protruding outward from the circumferential outer surface of plate body 320. Plate body 320 has sawtooth teeth 322 formed along the outer edge of plate body 320. Sawtooth teeth 322, together with a claw piece described below, constitute a ratchet mechanism that gradually biases wing members in the opening direction by a spring material (coil spring 40) (see FIG. 1).

[0033] Further, the plate body 320 is provided with four bolt holes 323 through which bolts of connecting members for connecting the shaft fixing plate 3 and the shaft holder 21 are inserted.

[0034] The finger hole portion 321 is a portion which functions integrally with the finger hole portion 311 of the front plate 31 described above, and has two finger holes 324, 324 formed therein for inserting fingers into these two finger holes 324, 324 to hold the target fixing jig 1. The finger hole portion 321 is also provided with two connecting holes 325 through which connecting members which connect the ratchet plate 32 and the front plate 31 are inserted.

[0035] (Wing link mechanism) As shown in FIG. 1, the wing link mechanism 4 has a rotatable operating handle portion 5 that is pivotally attached to the pivot shaft 2 on the back side of the axis fixing plate 3, and is a mechanism in which multiple wing members 6, 6 swing in conjunction with the rotation of the operating handle portion 5 to radially expand or close.

[0036] (Operation handle) The operating handle section 5 is made of resin such as acrylic resin (PMMA) and is mainly composed of a spring lock handle 51 shown in Fig. 7 and a movable wing handle 52 shown in Fig. 8. The spring lock handle 51 and the movable wing handle 52 are fitted onto the shaft holder 21 and are rotatable (see Fig. 4), and have the function of swinging the multiple wing members 6, 6 in conjunction with the manual rotation of the operating handle section 5. Fig. 7(a) is a front view showing the spring lock handle 51 of the operating handle section 5, and Fig. 7(b) is a front view showing the latch piece 512. Fig. 8 is a front view showing the movable wing handle 52 of the operating handle section 5.

[0037] ((Spring lock handle)) As shown in Fig. 7, the spring lock handle 51 is formed with a disk-shaped disk portion 510 having approximately the same diameter as the disk portion (plate body 310, plate body 320) of the shaft fixing plate 3, and a handle portion 511 that protrudes outward from the outer edge of the disk portion 510 and serves as a handle (grip) for rotating. As shown in Fig. 7(b), a latch piece 512 that constitutes the ratchet mechanism together with the saw teeth 322 of the ratchet plate 32 is attached to the spring lock handle 51. Also, as shown in Fig. 7(a), a shaft hole 513 for fitting into the shaft holder 21 is formed in the center of the disk portion 510.

[0038] The disk portion 510 is formed with a linearly extending hook hole 514 for hooking one end of the coil spring 40, which is a spring material that biases the wing member 6 in the expanding direction. The other end of the coil spring 40 is fixed to the shaft holder 21 or the like (see FIG. 4).

[0039] Furthermore, three arc-shaped bolt holes 515 are formed in the disk portion 510. As shown in FIG. 4, these bolt holes 515 are holes for accommodating bolt heads for connecting the wing movable handle 52 to another member fitted to the pivot shaft 2 and fixing it around the pivot shaft 2. These three bolt holes 515 are arc-shaped holes with a predetermined radius of curvature centered on the axis of the pivot shaft 2 so as to be rotatable around the pivot shaft 2. The spring lock handle 51 is fitted onto the shaft holder 21 and is interposed between the ratchet plate 32 and the wing movable handle 52, so as to be rotatable around the pivot shaft 2.

[0040] The hanging piece 512 is bolted to the disk portion 510 by inserting a bolt, which is a connecting member, through a hanging hole 516 formed in the disk portion 510 and a bolt hole 518 formed in the hanging piece 512.

[0041] Furthermore, a finger hole 517 is formed in the handle portion 511, and this finger hole 517 is used for rotating the spring lock handle 51 by inserting a finger into the finger hole 517.

[0042] A claw portion 519 is formed on the hook piece 512, and the tip of this claw portion 519 hooks onto the saw teeth 322 of the ratchet plate 32, thereby preventing the spring lock handle 51 from rotating. The spring lock handle 51 winds up the coil spring 40, one end of which is hooked onto the hook hole 514, depending on the difference in the relative rotation angle with respect to the wing movable handle 52, and the spring lock handle 51 urges the wing member 6 in the expanding direction by its restoring force.

[0043] ((Wing movable handle)) 8, the wing movable handle 52 is formed with a disk-shaped disk portion 520 having approximately the same diameter as the disk portion (plate body 310, plate body 320) of the shaft fixing plate 3, and a handle portion 521 that protrudes outward from the outer edge of the disk portion 520 and serves as a handle (grip) for rotating operation. Also, a shaft hole 522 for fitting into the shaft holder 21 is drilled in the center of the disk portion 520.

[0044] Further, in this disk portion 520, an arc-shaped spring insertion hole 523 is formed so that the wing movable handle 52 can rotate with the coil spring 40 inserted therethrough.

[0045] The disk portion 520 has three bolt holes 524 for fastening to the pivot shaft 2 via another member. By fastening to the pivot shaft 2, it becomes possible to rotate the pivot shaft 2 by manually rotating the wing movable handle 52.

[0046] In addition, a finger hole 525 is formed in the handle portion 521, and similar to the finger hole 517 described above, this finger hole 525 is used to rotate the wing movable handle 52 by inserting a finger into the finger hole 525.

[0047] ((Wing member)) Next, each wing member 6 of the wing link mechanism 4 of the target fixing jig 1 will be described with reference to Fig. 4 and Figs. 9 to 11. Fig. 9(a) is a front view showing the first wing member 61, Fig. 9(b) is a front view showing the second wing member 62, and Fig. 9(c) is a front view showing the first wing member 61 and the second wing member 62 connected together. Fig. 10 is a diagram showing the swinging operation of the wing member 6, where (a) shows the wing member 6 spread to fit a hole with a diameter of 32 mm, (b) shows the wing member 6 spread to fit a hole with a diameter of 45 mm, and (c) shows the wing member 6 spread to fit a hole with a diameter of 62 mm. Fig. 11 is a perspective view showing the wing member 6 of the target fixing jig 1 in an open state.

[0048] As shown in Fig. 4, the wing member 6 is made of resin such as acrylic resin (PMMA) except for the connecting member, and is composed of a pair of members, a first wing member 61 and a second wing member 62, which are made of substantially the same configuration. As shown in Fig. 9(a) and Fig. 9(b), the first wing member 61 and the second wing member 62 include ring portions 610, 620 fitted onto the pivot shaft 2, three arc-shaped arms 612, 622 extending radially from the ring portions 610, 620, and three broad bean-shaped tips 613, 623 connected to the tips of the arms 612, 622. The ring portions 610, 620, the arms 612, 622, and the tips 613, 623 are connected to each other by connecting members such as rivets so as to be able to swing freely.

[0049] Furthermore, the ring portions 610 and 620 are formed with three claw portions 611 and 621 at positions corresponding to the base ends of the three arm portions 612 and 622.

[0050] The first wing member 61 and the second wing member 62 have approximately the same configuration, but as shown in Figures 9(a) and 9(b), the arm portion 612 and the tip portion 613 bend to the right as they approach the tip, while the arm portion 622 and the tip portion 623 bend to the left as they approach the tip, which is the opposite direction when viewed from the front.

[0051] In addition, the ring portion 610 of the first wing member 61 is fixed to the pivot shaft 2 and rotates together with the rotation of the pivot shaft 2, whereas the ring portion 620 of the second wing member 62 is not fixed to the pivot shaft 2 and does not rotate.

[0052] Meanwhile, the first wing member 61 and the second wing member 62 have the tips of the arms 612, 622 connected to each other by a connecting rivet 614. For this reason, when the pivot shaft 2 rotates by rotating the wing movable handle 52, the ring portion 610 of the first wing member 61 rotates but the ring portion 610 of the second wing member 62 does not rotate, resulting in a difference in the rotation angles of these ring portions 610 and 620.

[0053] 9(c), a position difference (distance) occurs between the base end of arm 612, which moves while connected to ring portion 610, and the base end of arm 622, which does not move. Therefore, by connecting the tips of arm portions 612, 622 to each other with connecting rivet 614, arm portions 612, 622 swing and rise, and each tip portion 613, 623 spreads out radially away from pivot shaft 2.

[0054] In this way, each wing member 6 has wings 63 each consisting of arm portions 612, 622 and tip portions 613, 623 that can gradually and steplessly swing upward and outward, or downward and close, in response to the rotation of the wing movable handle 52 (see FIG. 9(c)). For example, as shown in FIG. 10, when the wing is attached to a hole h1 having a diameter of 32 mm, it is in the state shown in FIG. 10(a), when the wing is attached to a hole h2 having a diameter of 45 mm, it is in the state shown in FIG. 10(b), and when the wing is attached to a hole h3 having a diameter of 62 mm, it is in the state shown in FIG. 10(c).

[0055] That is, when the spring lock handle 51 and the wing movable handle 52 of the operating handle part 5 are rotated in the direction of the arrow in FIG. 1, each wing 63 rises and spreads radially, and each wing 63 abuts against the inner peripheral wall of the hole (h1 to h3), and the wing movable handle 52 and the pivot shaft 2 cannot rotate in the direction of the arrow. After that, when the spring lock handle 51 is further rotated in the direction of the arrow in FIG. 1, as described above, the coil spring 40, one end of which is hooked in the hook hole 514, is wound up, and the restoring force of the coil spring 40 biases the wing member 6 in the direction of spreading. Then, the hook piece 512 of the ratchet mechanism is hooked on the sawtooth 322, so that the spring lock handle 51 is prevented from returning in the opposite direction of the arrow by the restoring force of the coil spring 40, and the biasing force of the coil spring 40 is maintained. Therefore, the target fixing jig 1 allows anyone to easily and accurately mount the target at the center position of the hole in a short time.

[0056] As described above, one target fixing jig 1 can accommodate holes of various diameters, and by reducing the number of types of target fixing jigs 1 that are always in stock, it is possible to achieve a reduction in the cost of measuring the center positions of holes such as anchor holes. The target fixing jig 1 according to this embodiment is capable of accommodating all holes with diameters of 32 mm to 62 mm that are assumed to be general anchor holes. Of course, by changing the size of the target fixing jig 1 itself, it is possible to accommodate both large diameter holes exceeding 62 mm and small diameter holes less than 32 mm.

[0057] Furthermore, the target fixing jig 1 can perform a gradual, stepless swinging motion in which each of the wings 63 rises and spreads evenly radially, and therefore does not encounter a situation in which the target cannot be fully opened, as occurs with the leg opening device for the target mounting member in Patent Document 1. For this reason, the target fixing jig 1 can be fixed by reliably aligning the center of the target indicator T with the center position of the hole, even if aggregate or rebar protrudes partially from the inner circumferential surface of the hole into which the target fixing jig 1 is attached.

[0058] 1 and 2, the target fixing jig 1 according to this embodiment has two sets of wing members 6 spaced apart in the axial direction of the pivot shaft 2. Therefore, the target fixing jig 1 can be supported and fixed at two points spaced apart on the inner circumferential surface of the hole by the wing members 6. Therefore, the target fixing jig 1 can be fixed more stably than if it were supported and fixed at one point.

[0059] (Spacer material) 1 and 2, in the target fixing jig 1 according to this embodiment, spacer members 7 made of resin such as acrylic resin (PMMA) are interposed between the two sets of wing members 6 and the operating handle portion 5. The spacer members 7 have shaft holes 70 through which the pivot shafts 2 are inserted, and by being interposed between the wing members 6 and the operating handle portion 5, they have the function of ensuring space to position the wing members 6 that support and fix the target fixing jig 1 in the holes further back from the surface of the concrete structure without impeding the rotation of the pivot shafts 2.

[0060] Therefore, the wing members 6 of the target fixing jig 1 that are fixed and supported in the hole can be disposed deep in the hole away from the surface of the concrete structure in which the hole is drilled. This makes it possible to fix the jig deeper than the concrete covering portion that is likely to deteriorate, and allows the target fixing jig 1 to be fixed in the hole more stably.

[0061] According to the target fixing jig 1 according to the first embodiment of the present invention described above, the multiple wing members 6 swing in conjunction with the rotation of the movable wing handle 52 of the operating handle unit 5, and open or close steplessly and evenly relative to the pivot shaft 2, so that the wing members 6 do not become fully open. Therefore, by simply manually rotating the movable wing handle 52, anyone can easily and quickly attach and fix the target indicator T accurately at the center position of the hole.

[0062] Furthermore, the target fixing jig 1 is fixed by the wing link mechanism 4 which is linked to the rotation of the operating handle portion 5, so compared to the target mounting jig of Patent Document 1, the jig has a shorter depth and can be attached to shallow holes, resulting in a compact overall size. This makes it easy for one person to carry multiple target fixing jigs 1, and one person can carry all the target fixing jigs 1 for the multiple holes required to attach brackets, etc., at once.

[0063] Moreover, with the target fixing jig 1, the target fixing jig 1 can be attached to the hole by simply rotating the spring lock handle 51, with the spring force of the coil spring 40 providing an appropriate bias. Therefore, with the target fixing jig 1, the target indicator T can be attached accurately to the center position of the hole easily and in a short time.

[0064] In addition, since the main components of the target fixing jig 1 are made of resin or light metal, which is lighter than steel, it is easy to carry, and one person can carry all the target fixing jigs 1 for the multiple holes required to attach brackets, etc., at one time.

[0065] [Second embodiment] Next, a target fixing jig 1' according to a second embodiment of the present invention will be described with reference to Fig. 12. Fig. 12 is a side view showing the target fixing jig 1' according to the second embodiment. The difference from the target fixing jig 1 according to the first embodiment described above is mainly in that the spacer member 7 is not interposed between the wing member 6 and the operating handle portion 5, but is interposed between the two wing members 6. Therefore, this point will be mainly described, and the same components will be given the same reference numerals and description will be omitted.

[0066] As shown in Fig. 12, in the target fixing jig 1' according to the second embodiment, a spacer member 7 is interposed between two wing members 6. Therefore, according to the target fixing jig 1', one of the wing members 6 is disposed closer to the surface of the concrete structure than the target fixing jig 1. However, on the other hand, the two wing members 6 are separated by the spacer member 7. Therefore, even if something comes into contact with the shaft fixing plate 3, which is the tip part of the target fixing jig 1, and a rotational moment is generated in the target fixing jig 1, the distance between the supporting wing members 6 is widened, so the reaction force due to this rotational moment is smaller, and the target can be supported and fixed more stably.

[0067] [Third embodiment] Next, a target fixing jig 1" according to a third embodiment of the present invention will be described with reference to FIG. 13. FIG. 13 is a side view showing the target fixing jig 1" according to the third embodiment. The main difference from the target fixing jig 1 according to the first embodiment described above is that a spacer member 7 is not attached. Therefore, this point will be mainly described, and the same components will be given the same reference numerals and descriptions thereof will be omitted.

[0068] As shown in FIG. 13, a target fixing jig 1" according to the third embodiment does not have a spacer member 7 attached. For this reason, it is shorter in the axial direction of the pivot shaft 2 than the target fixing jig 1 according to the first embodiment and the target fixing jig 1' according to the second embodiment described above.

[0069] For this reason, target fixing jig 1" can be made more compact and lightweight than target fixing jig 1 and target fixing jig 1'. This makes it even easier for one person to carry multiple target fixing jig 1", and one person can carry all of the target fixing jigs 1" needed for the multiple holes required for attaching brackets, etc., at one time.

[0070] The target fixing jigs 1-1" according to the first to third embodiments of the present invention have been described above in detail. However, the above-mentioned and illustrated embodiments are merely illustrative of specific embodiments for carrying out the present invention. Therefore, the technical scope of the present invention should not be construed in a limiting manner based on these.

[0071] In particular, acrylic resin (PMMA) has been given as an example of the material for the main components of the target fixing jig, but it is also possible to use other resins with a lighter specific gravity than steel, or light metals such as aluminum alloys with a lighter specific gravity than steel. Note that light metals here refer to metals with a specific gravity of 5 or less, such as aluminum (specific gravity 2.7), magnesium (specific gravity 1.7), beryllium (specific gravity 1.9), and titanium (specific gravity 4.5), which are lighter than iron (specific gravity 7.85).

[0072] Furthermore, although the target fixing jig 1-1'' according to the first to third embodiments has two sets of wing members 6 that are supported and fixed in holes, it may have only one set of wing member 6. [Explanation of symbols]

[0073] 1,1',1”: Target fixture 2: Pivot shaft 21,22: Shaft holder 3: Shaft fixing plate 31: Front plate 310: Plate body 311: Finger hole 312: Bolt hole 313: Crosshairs 314: Finger hole 315: Connection hole 32: Ratchet plate 320: Plate body 321: Finger hole 322: Sawtooth 323: Bolt hole 324: Finger hole 325: Connection hole 4: Wing link mechanism 40: Coil spring (spring material) 5: Operating handle section 51: Spring lock handle 510: Disc Club 511: Handle part 512: Hanging piece 513: Shaft hole 514: Hanging hole 515: Bolt hole 516: Hanging hole 517: Finger hole 518: Bolt hole 519: Claw part 52: Wing movable handle 520: Disc Club 521: Handle part 522: Shaft hole 523: Spring insertion hole 524: Bolt hole 525: Finger hole 6: Wing material 61: First wing member 610: Ring section 611: Claw part 612: Wing 613: Tip (wing) 614: Connecting rivet 62: Second wing member 620: Ring section 621: Claw part 622: Wing 623: Tip (wing) 63: Wing 7: Spacer material 70: Shaft hole T: Target display h1,h2,h3:hole

Claims

1. A target fixing jig for fixing a target to a hole for measuring a center position of the hole, a pivot shaft made of a rod or tube, a shaft fixing plate that supports and fixes the pivot shaft so that the pivot shaft is perpendicular to a plate surface, the target attached to the shaft fixing plate, a plurality of wing members that swing so that their tips uniformly expand or close radially relative to the pivot shaft, and a wing link mechanism that swings the plurality of wing members in conjunction with one another; The wing link mechanism has a rotatable wing movable handle attached to the pivot shaft, and the plurality of wing members swing in conjunction with the rotation of the wing movable handle. A target fixing jig comprising:

2. The present invention further includes a spring member for biasing the plurality of wing members in a direction in which the wing members spread apart, and a spring lock handle having one end fixed thereto and attached to the pivot shaft via a ratchet mechanism. The target fixture of claim 1 .

3. The wing link mechanism is attached to the pivot shaft in a plurality of parts. The target fixing jig according to claim 1 or 2, characterized in that

4. The plurality of wing link mechanisms are attached to the pivot shaft at intervals via spacer members. The target fixing jig according to claim 3 .

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