JP7621174B2 - Target Fixture - Google Patents

Description

The present invention relates to a target fixing jig that fixes a target in a hole to measure the center position of the hole.

In order to replace old-standard bearings with larger shoe bearings that comply with 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 space above the substructure of bridges, such as abutments. These retrofit steel brackets are attached using post-installed anchors after drilling anchor holes into the existing reinforced concrete substructure. At this time, since the exact position of the rebar in the existing substructure is not known, if an anchor hole is drilled and comes into contact with the rebar, it is drilled again in a nearby position to avoid this. Finally, the center position of the drilled hole is measured, and a steel bracket is manufactured in a factory according to the anchor hole, and after completion, it is attached to the on-site abutment.

For this reason, it is necessary to accurately measure the center position of the hole drilled in the bridge's substructure, and traditionally this was measured by tracing it onto a sheet or similar. However, tracing it from the vertical side of an uneven concrete structure is difficult and time-consuming, and there is also the problem that it can be misaligned and make it impossible to measure accurately. As a result, in recent years, a target marked with a specified pattern has been placed at the center of the anchor hole, photographed with a digital camera, etc., and the photographed image is then computer-processed to make measurements.

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

In order to solve this problem, Patent Document 1 discloses a target mounting member that is composed of a support rod 1 having a predetermined length, two or more leg opening devices 2 that open the leg opening arms 23 like an umbrella and are spaced apart on the support rod 1, and a target plate 32 that is attached to the end of the support rod 1 (see claim 1 in the claims of Patent Document 1, paragraphs [0016] to [0021] of the specification, and Figures 1 and 2 of the drawings, etc.).

However, the target mounting member described in Patent Document 1 pushes open and fixes the leg-spreading arms 23, which have a certain length, so a certain hole depth is required for just one leg-spreading device 2, and it is necessary to provide multiple leg-spreading devices 2 at intervals. This means that while it can be applied to holes that are deeper than a certain depth, such as anchor holes, there is a problem that it cannot be applied to holes that are shallow. There is also a problem that it cannot be properly fixed if there is rebar or aggregate protruding into the anchor hole.

The target mounting member described in Patent Document 1 is configured so that the leg-opening arms 23 open when the retaining sleeve 4 that holds the spring member 25 that biases the leg-opening arms 23 to open is removed. This not only makes it difficult to insert the target mounting member into the anchor hole, but also makes it necessary to pull the target mounting member out of the hole when redoing or making fine adjustments, resulting in poor work efficiency.

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

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. For this reason, 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 would be too heavy to carry by one person would be required, which also posed a problem of poor work efficiency.

JP 2019-157378 A

"New Technology Information System" [online], [searched February 22, 2021], Internet, <URL: https://www.netis.mlit.go.jp/netis/pubsearch/details?regNo=QS-180029%20>

The present invention was devised in consideration of the above problems, and its purpose is to provide a target fixing jig that can be easily and accurately installed by anyone in a short time, can be installed in shallow holes, and is compact in size overall and easy to carry.

The target fixing jig described in claim 1 is a target fixing jig for fixing a target to a hole for measuring the center position of the hole, and includes a pivot shaft made of a rod or tube material, a shaft fixing plate that supports and fixes the pivot shaft so that it is perpendicular to the plate surface, the target attached to the shaft fixing plate, a number 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 multiple wing members in conjunction with each other, and the wing link mechanism has a rotatable wing movable handle attached to the pivot shaft, and the multiple wing members swung in conjunction with the rotation of the wing movable handle.

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 plurality of wing members in the spreading direction, and a spring lock handle to which one end of the spring material is fixed and which is attached to the pivot shaft via a ratchet mechanism.

The target fixing jig described in claim 3 is the target fixing jig described in claim 1 or 2, characterized in that the wing link mechanism is attached to the pivot shaft in multiple units.

The target fixing jig described in claim 4 is the target fixing jig described in claim 3, characterized in that the multiple wing link mechanisms are attached to the pivot shaft at a distance via a spacer member.

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 relative to the pivot shaft, so that the wing members do not end up not fully opening, and anyone can easily and quickly attach the target accurately to 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 attached to shallow holes, and can be made compact in overall size. This makes it easy for one person to carry multiple target fixing jigs, and one person can carry target fixing jigs for multiple holes required for attaching brackets, etc., at once.

In particular, according to the invention of claim 2, the target fixing jig can be attached to the hole by the force of the spring appropriately biased by the ratchet mechanism, and the target can be attached accurately to the center position of the hole more easily and quickly.

In particular, according to the inventions of claims 3 and 4, the target fixing jig can be fixed to the hole at multiple points, allowing the target to be fixed to the hole more stably.

FIG. 1 is a perspective view showing a target fixing jig according to a first embodiment of the present invention. FIG. 2 is an exploded perspective view showing the target fixing jig. FIG. 3 is a side view showing the target fixing jig. FIG. 4 is a schematic cross-sectional view taken along the axial direction and showing a schematic configuration of the target fixing jig. FIG. 5 is a front view showing a front plate of a shaft fixing plate of the target fixing jig. FIG. 6 is a front view showing a ratchet plate of the shaft fixing plate. 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. FIG. 8 is a front view showing a movable wing handle of the operating handle portion of the above. 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. FIG. 10 is a diagram showing the swinging motion of the wing member of the above-mentioned embodiment, 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 with a hole with a diameter of 45 mm, and (c) shows the state in which it is aligned with a hole with a diameter of 62 mm. FIG. 11 is a perspective view showing the above wing member in an open state. FIG. 12 is a side view showing a target fixing jig according to the second embodiment of the present invention. FIG. 13 is a side view showing a target fixing jig according to the third embodiment of the present invention.

The target fixing jig according to an embodiment of the present invention will be described in detail below with reference to the drawings.

[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 is a schematic view showing the configuration of the target fixing jig 1 with some parts omitted.

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 multiple wing members 6 (described below) in conjunction with each other.

(Pivot shaft)
The pivot shaft 2 is a metal rod or tube such as a steel bar or steel pipe, and is a basic member that is installed in the center of a hole where the shaft core is attached and serves as the axis of rotation and swinging 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.

As shown in FIG. 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 with 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 the shaft holder 21 on the front side (surface side of the concrete structure) and the shaft holder 22 on the back side.

(Axis fixing plate)
4, the shaft fixing plate 3 is made of two transparent resin plates such as acrylic resin (PMMA) having a light transmittance of more than 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.

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 also 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.

((Front plate))
5, the front plate 31 has a disk-shaped plate body 310 and finger hole portions 311 that protrude 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.

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. In addition, 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.

As shown in FIG. 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, which will be described later. In short, it is sufficient that the target indicator T is attached so that it can be seen or photographed from the front side of the front plate 31. In addition, a crosshair 313 is formed on the front plate 31, so that 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.

As shown in Figure 1, the target display T is printed with a circular mark called a RAD (Ringed Automatically Detected) target, which is used to automatically measure the center position of the target by processing the image of the photographed data taken with a digital camera by a computer. Furthermore, these target displays T all have different marks in parts so that multiple target displays T can be photographed at once and numbered automatically. Of course, it goes without saying that the targets are not limited to RAD targets, as long as the center position can be automatically measured by computer image processing from the photographed data.

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

Furthermore, the plate body 320 has four bolt holes 323 through which the bolts of the connecting member for connecting the shaft fixing plate 3 and the shaft holder 21 are inserted.

The finger hole portion 321 is a portion that functions in conjunction with the finger hole portion 311 of the front plate 31 described above, and has two finger holes 324, 324 formed therein, into which fingers are inserted to hold the target fixing jig 1. In addition, the finger hole portion 321 is provided with two connecting holes 325 through which connecting members that connect the ratchet plate 32 and the front plate 31 are inserted.

(Wing link mechanism)
As shown in FIG. 1, the wing link mechanism 4 has a rotatable operating handle portion 5 which is pivotally attached to the pivot shaft 2 on the rear 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 open or close radially.

(Operation handle section)
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.

(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 operation. 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.

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

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 that accommodate 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 that the wing movable handle 52 can rotate freely 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 that the spring lock handle 51 can rotate freely around the pivot shaft 2.

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

In addition, a finger hole 517 is formed in the handle portion 511, and this finger hole 517 is used to insert a finger into the finger hole 517 to rotate the spring lock handle 51.

The hook piece 512 is formed with a claw portion 519, and the tip of this claw portion 519 hooks onto the sawtooth 322 of the ratchet plate 32, rendering the spring lock handle 51 unrotatable. 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 uses its restoring force to urge the wing member 6 in the direction of spreading.

((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.

In addition, this disk portion 520 has an arc-shaped spring insertion hole 523 formed so that the wing movable handle 52 can rotate when the coil spring 40 described above is inserted through it.

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 is possible to rotate the pivot shaft 2 by manually rotating the wing movable handle 52.

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 insert a finger into the finger hole 525 to rotate the wing movable handle 52.

(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 Fig. 9 to Fig. 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 state in which the first wing member 61 and the second wing member 62 are connected. Fig. 10 is a diagram showing the swinging operation of the wing member 6, where (a) shows the state in which the wing member 6 is expanded to fit a hole with a diameter of 32 mm, (b) shows the state in which the wing member 6 is expanded to fit a hole with a diameter of 45 mm, and (c) shows the state in which the wing member 6 is expanded to fit a hole with a diameter of 62 mm. Fig. 11 is a perspective view showing the state in which the wing member 6 of the target fixing jig 1 is opened.

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 approximately the same configuration. As shown in FIG. 9(a) and FIG. 9(b), the first wing member 61 and the second wing member 62 are provided with 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 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 that they can swing freely.

In addition, three claws 611, 621 are formed on the ring portions 610, 620 at positions corresponding to the base ends of the three arms 612, 622.

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, whereas the arm portion 622 and the tip portion 623 bend to the left as they approach the tip, in the opposite direction when viewed from the front.

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.

Meanwhile, the first wing member 61 and the second wing member 62 have their arms 612, 622 connected at their tips by a connecting rivet 614. Therefore, 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 angle between the ring portions 610 and 620.

As a result, as shown in FIG. 9(c), a difference (distance) in position occurs between the base end of arm 612, which moves when connected to ring portion 610, and the base end of arm 622, which does not move. Therefore, because the tips of arms 612, 622 are connected to each other by connecting rivet 614, arms 612, 622 swing and rise, and each tip 613, 623 spreads out radially away from pivot shaft 2.

In this way, each wing member 6 has wings 63, each of which is made up of arms 612, 622 and tips 613, 623, that rise and spread radially or fall and close in response to the rotation of the wing movable handle 52, and can perform a gradual and stepless swinging motion (see FIG. 9(c)). For example, as shown in FIG. 10, when the wing is attached to a hole h1 with a diameter of 32 mm, it is in the state shown in FIG. 10(a), when the wing is attached to a hole h2 with 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 with a diameter of 62 mm, it is in the state shown in FIG. 10(c).

In other words, when the spring lock handle 51 and the wing movable handle 52 of the operating handle section 5 are rotated in the direction of the arrow in FIG. 1, the wings 63 rise up and spread out radially, and the wings 63 come into contact with the inner circumferential walls of the holes (h1 to h3), making it impossible for the wing movable handle 52 and the pivot shaft 2 to 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, by hooking the hook piece 512 of the ratchet mechanism to the sawtooth 322, the spring lock handle 51 is prevented from returning in the opposite direction of the arrow due to the restoring force of the coil spring 40, and the biasing force of the coil spring 40 is maintained. Therefore, anyone can easily and quickly attach the target to the center position of the hole with the target fixing jig 1.

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 must be constantly stocked, it is possible to reduce the cost of measuring the center positions of holes such as anchor holes. The target fixing jig 1 according to this embodiment can accommodate all holes with diameters between 32 mm and 62 mm, which are generally assumed to be 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.

In addition, the target fixing jig 1 can perform a gradual and stepless swinging motion in which each wing 63 rises and spreads evenly radially, so there is no risk of it not being fully opened as occurs with the target mounting member leg opening device of Patent Document 1. Therefore, the target fixing jig 1 can reliably fix the center of the target display T in line with the center 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.

As shown in Figures 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 peripheral 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.

(Spacer member)
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 have the function of ensuring space for positioning the wing members 6, which support and fix the target fixing jig 1, at a position deeper from the surface of the concrete structure by being interposed between the wing members 6 and the operating handle portion 5 without impeding the rotation of the pivot shafts 2.

As a result, the target fixing jig 1 allows the wing members 6 that are fixed and supported in the hole to be positioned deep inside the hole, away from the surface of the concrete structure in which the hole is being drilled. This makes it possible to fix the jig deeper than the concrete covering, which is at high risk of deterioration, and allows the target fixing jig 1 to be fixed more stably in the hole.

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 section 5, and open or close evenly and steplessly relative to the pivot shaft 2, so that the wing members 6 do not fail to open completely. Therefore, by simply manually rotating the movable wing handle 52, anyone can easily and quickly attach and fix the target display T accurately to the center position of the hole.

In addition, the target fixing jig 1 is fixed by the wing link mechanism 4 that is linked to the rotation of the operating handle portion 5, so compared to the target mounting jig of Patent Document 1, it is a jig with a shorter depth, can be attached to shallow holes, and can have an overall compact 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.

In addition, with the target fixing jig 1, the spring force of the coil spring 40 can be used to properly bias the target fixing jig 1 into the hole by simply rotating the spring lock handle 51, which is a very simple operation. Therefore, with the target fixing jig 1, the target display T can be easily and quickly attached to the center position of the hole accurately.

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

[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 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.

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 positioned closer to the surface side 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 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.

[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.

As shown in FIG. 13, the target fixing jig 1" according to the third embodiment does not have a spacer member 7 attached. Therefore, compared to the target fixing jig 1 according to the first embodiment and the target fixing jig 1' according to the second embodiment, it is shorter in the axial direction of the pivot shaft 2.

As a result, the target fixing jig 1" can be made more compact and lightweight than the target fixing jig 1 and the target fixing jig 1'. This makes it easier for one person to carry multiple target fixing jigs 1", and one person can carry all the target fixing jigs 1" needed for the multiple holes required to attach brackets, etc., at once.

The target fixing jigs 1-1" according to the first to third embodiments of the present invention have been described in detail above, but each of the embodiments described above and shown in the figures merely shows one embodiment of the present invention. Therefore, the technical scope of the present invention should not be interpreted in a limiting manner based on these.

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 that are lighter than iron (specific gravity 7.85), such as aluminum (specific gravity 2.7), magnesium (specific gravity 1.7), beryllium (specific gravity 1.9), and titanium (specific gravity 4.5).

In addition, the target fixing jigs 1-1" according to the first to third embodiments are exemplified as having two sets of wing members 6 that support and fix the target in the holes, but it is also possible to have only one set of wing members 6.

1, 1', 1": target fixing jig 2: pivot shafts 21, 22: shaft holder 3: shaft fixing plate 31: front plate 310: plate body 311: finger hole portion 312: bolt hole 313: crosshairs 314: finger hole 315: connection hole 32: ratchet plate 320: plate body 321: finger hole portion 322: sawtooth 323: bolt hole 324: finger hole 325: connection hole 4: wing link mechanism 40: coil spring (spring material)
5: Operating handle portion 51: Spring lock handle 510: Disc portion 511: Handle portion 512: Hook piece 513: Shaft hole 514: Hook hole 515: Bolt hole 516: Hook hole 517: Finger hole 518: Bolt hole 519: Claw portion 52: Wing movable handle 520: Disc portion 521: Handle portion 522: Shaft hole 523: Spring insertion hole 524: Bolt hole 525: Finger hole 6: Wing member 61: First wing member 610: Ring portion 611: Claw portion 612: Arm portion (wing)
613: Tip (wing)
614: connecting rivet 62: second wing member 620: ring portion 621: claw portion 622: arm portion (wing)
623: Tip (wing)
63: Wing 7: Spacer member 70: Shaft hole T: Target display h1, h2, h3: Holes

Claims (4)

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. 2. The target fixing jig according to claim 1, further comprising: a spring material that biases the plurality of wing members in a direction in which the wing members spread apart; and a spring lock handle having one end fixed to the spring material and attached to the pivot shaft via a ratchet mechanism. The target fixing jig according to claim 1 or 2, wherein a plurality of the wing link mechanisms are attached to the pivot shaft. 4. The target fixing jig according to claim 3, wherein the plurality of wing link mechanisms are attached to the pivot shaft at intervals via spacer members.

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