Pinpole holding device for measurement

Abstract

To provide a pin pole holding device for surveying, which is small in size and light in weight, superior in handling property, can vertically adjust and hold a pin pole by simple operation, and directly holds the pin pole.SOLUTION: A pin pole holding device for surveying includes: a pin pole holder 30 for directly holding a pin pole 10; a first support rod 11 and a second support rod 12 for supporting the pin pole 10; and a weight 40 for balancing the pin pole 10 in a held state. A triangle is formed by a pin pole holding part 31 in which the pin pole 10 is fitted, a first support part 32 and a second support part 33 for holding the first support bar 11 and the second support bar 12 in a manner to be rotatable in a direction perpendicular to a reference plane. A center line of the pin pole holder 30 connecting the pin pole 10 and the weight 40 passes between the first support part 32 and the second support part 33.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a surveying pin pole holding device that directly holds a pin pole to which a target such as a prism target is attached during surveying. [Background technology]

[0002] FIG. 9 shows the structure of a typical tripod-type survey pinpole holder (first conventional example) 100 shown in FIG. 2 of Patent Document 1, for example. This pinpole holder 100 is a well-known tripod 101 with a clip-shaped holder 103 with a level 108 attached to a pan head 102 at the top. Each leg 104 of the tripod 101 is composed of a plurality of cylindrical members (e.g., an outer cylinder and an inner cylinder) 105, 106 with different outer and inner diameters, and a fixing screw 107 for fixing these cylindrical members 105, 106 relatively. When starting a survey, an operator adjusts the length of the leg 104 of the tripod 101 while looking at the level 108 to make the holder 103 almost horizontal, and further fine-tunes the pan head 102 to make the holder 103 completely horizontal. Then, a pinpole 110 is clamped by a clip part 109 at the tip of the holder 103. Prism target 111 attached to pin pole 110 is also provided with level 112, so pin pole 110 is adjusted so as to be vertical while watching level 112. Prism target 111 is fitted into pin pole 110 and is slidable in the longitudinal direction of pin pole 110. As a result, prism target 111 is held so that its optical axis is horizontal.

[0003] In the conventional survey pinpole holding device 100, the pinpole 110 is not held directly, so that fine adjustments must be made multiple times while watching the two spirit levels 108, 112 in order to hold the pinpole 110 vertically, and adjustments take time. In addition, the cylindrical members 105, 106 of the leg 104 of the tripod 101 are made of metal pipes such as aluminum, and the pan head 102 is also made of aluminum die-casting or the like. Furthermore, the holder 103 uses a strong spring to firmly hold the pinpole 110 with the clip part 109, and the holder 103 itself is large. Therefore, the conventional survey pinpole holding device 100 is large and heavy, making it inconvenient to carry and handle.

[0004] FIG. 10 shows the structure of a bipod-type survey pinpole holding device (second conventional example) 200 described in Patent Document 2, where (a) is a front view and (b) is a side view. This pinpole holding device 200 is composed of a pair of legs 201, a leg extension / retraction adjustment lever 202 for extending and fixing the legs 201, a leg grip 203 as a handle, a connecting part 204 for connecting the pair of legs 201 so as to be openable and closable, a fixing rod 205 for holding the pinpole, which is extended downward from the connecting part 204, and two clip-like clamping devices 206 attached to the fixing rod 205. The pinpole 210 is held almost parallel to the fixing rod 205 by the clip-like clamping devices 206. The length of the fixing rod 205 is shorter than the length of the legs 201, and the pinpole holding device 200 is supported at three points by the pair of legs 201 and the pinpole 210. Each leg 201 is composed of a plurality of cylindrical members (e.g., an outer cylinder and an inner cylinder) 207, 208 having different outer and inner diameters, as in the case of the first conventional example. When starting a survey, an operator operates the leg extension and retraction adjustment lever 202 to release the lock while looking at a spirit level 211 provided at the top of the pin pole 210, and pulls out the inner cylinder 208 from the outer cylinder 207 to adjust the length of the leg 201. The prism target 212 is fitted into the pin pole 210 and is slidable in the longitudinal direction of the pin pole 210. By holding the pin pole 210 vertically, the prism target 212 is held so that its optical axis is horizontal.

[0005] Compared with the tripod-type pin pole holding device 100 of the first conventional example, the bipod-type pin pole holding device 200 of the second conventional example has one less leg and does not have a pan head, so it is small and lightweight, and its handling is improved. In addition, since the leg extension adjustment lever 202 is provided on the upper part of the leg 201, it is relatively easy to adjust the length of the leg 201. However, in order to hold the pin pole 210 vertically, the length of the pair of legs 201 must be adjusted while watching the level 211, and adjustment takes time. In addition, the pin pole holding device 200 is difficult to finely adjust because it does not have a pan head. Furthermore, when a force is applied to the pin pole holding device 200 in the direction of the arrow X while holding the pin pole 210 vertically, a reaction force against the force in the X direction cannot be generated, and there is a possibility that it will fall over in the direction of the arrow Y. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Real No. 3218837 [Patent Document 2] JP 2017-075926 A (Patent No. 6373819) Summary of the Invention [Problem to be solved by the invention]

[0007] The present invention has been made to solve the problems of the conventional examples described above, and aims to provide a surveying pinpole holding device that is small, lightweight, easy to handle, and can adjust and hold the pinpole vertically with extremely simple operation, and that directly holds the pinpole to which a target is attached. [Means for solving the problem]

[0008] The survey pin pole holding device according to the present invention is A pin pole holder that is fixed perpendicular to the central axis of the pin pole; A first support rod and a second support rod fitted in the pin pole holder for supporting the pin pole; A weight is provided for balancing the pin pole while the pin pole is being held, The pin pole holder is a pin pole holding portion into which the pin pole is fitted; a first support portion and a second support portion that are provided at the other two vertices of a triangle, with the pin pole holding portion being one vertex of the triangle, and that hold the first support rod and the second support rod rotatably in a direction perpendicular to a reference plane formed by the triangle; A weight connecting portion for connecting the weight; having The center line of the pin pole holder connecting the pin pole holding part and the weight connecting part passes between the first support part and the second support part. It is characterized by:

[0009] In the above pin pole holding device, a spirit level may be provided near the pin pole holding portion on the upper surface of the pin pole holder.

[0010] In the above pin pole holding device, the pin pole holder may be configured to be approximately Y-shaped when viewed from a direction perpendicular to the reference plane, and the three vertices of the triangle may be located near the three vertices of the approximately Y-shape.

[0011] In the above pin pole holding device, the triangle may be a scalene triangle, and the distance between the pin pole holding portion and the first support portion may be configured to be different from the distance between the pin pole holding portion and the second support portion.

[0012] In the above pin pole holding device, the first support rod and the second support rod may be configured to have different lengths.

[0013] In the above pin pole holding device, the first support part and the second support part may be configured to include a support rod fitting hole into which the first support rod and the second support rod are respectively fitted, a support rod holder having a rotation axis perpendicular to the central axis of the support rod fitting hole, a bearing part formed on the pin pole holder so as to protrude outward from the apex of the triangle and holding the rotation axis of the support rod holder parallel to the reference plane, and a support rod fixing screw that fixes the first support rod and the second support rod to the support rod holder.

[0014] In the above-mentioned pin pole holding device, the weight connecting part may be configured to include a weight holder that rotatably suspends and supports the weight, a weight guide rod that guides the weight holder so that it can slide freely, a rotating member into which one end of the weight guide rod is fitted and fixed, a sliding member that rotatably holds the rotating member, and a guide groove formed inside the pin pole holder and that slidably guides the sliding member.

[0015] In the above pin pole holding device, the pin pole holding portion may be configured to accommodate a plurality of types of pin poles having different outer diameters, and an insert part having an inner diameter corresponding to the outer diameter of the pin pole may be fitted therein. Effect of the Invention

[0016] According to the configuration of the survey pinpole holding device of the present invention, since the pinpole is held directly by the pinpole holder, only the first and second support rods are required, and the structure is simple and the device can be made small and lightweight. In addition, since the pinpole is provided with a weight for balancing while holding the pinpole, even if a force acts in a direction to tip the pinpole while the pinpole is held vertically, the gravity acting on the weight generates a reaction force, making the pinpole less likely to tip. Furthermore, since the center line of the pinpole holder connecting the pinpole holding part and the weight connecting part passes between the first support part and the second support part, the gravity acting on the weight acts almost evenly on the first support rod and the second support rod, and the pinpole is held vertically in a stable state.

[0017] In addition, since the first and second support rods are held by the first and second support parts so as to be rotatable in a direction perpendicular to the reference plane, when adjusting the position of the pin pole, the worker only needs to operate the vicinity of the upper end of the pin pole while watching the spirit level. The first and second support rods follow the inclination of the pin pole by their own weight and change their position, so there is no need to adjust the length of the legs as in the conventional example, and the pin pole can be adjusted and held vertically with a very simple operation. Furthermore, since the first and second support rods are held by the first and second support parts so as to be rotatable, the pin pole and the first and second support rods can be stored so as to be parallel to each other, making it easy to transport and store and excellent in handleability.

[0018] Also, by making the pin pole holder approximately Y-shaped when viewed from a direction perpendicular to the reference plane, the pin pole holder can be made lighter. Also, by making the triangle formed by the pin pole holding part and the first and second support parts a scalene triangle, the possibility of interference between the pin pole and the first support rod and / or the second support rod, which occurs when the triangle is an equilateral triangle or an isosceles triangle, can be reduced. [Brief description of the drawings]

[0019] [Figure 1] 1 is a perspective view showing the configuration of a surveying pin pole holding device according to the present embodiment, illustrating a state in which the pin pole is adjusted to be vertical. FIG. [Diagram 2] 1 is a perspective view showing the configuration of the pin pole holding device, and shows a state in which the pin pole is being adjusted to be vertical. FIG. [Diagram 3] FIG. [Figure 4] FIG. 2 is a plan view of a pin pole holder (part) that constitutes the pin pole holding device. [Diagram 5]A partial cross-sectional view showing the configuration of the pin pole holding part and the first support part or the second support part of the above-mentioned pin pole holder, where (a) is a state in the middle of adjusting the pin pole, (b) is a state in which the pin pole has been adjusted vertically, and (c) is a diagram showing the state in which the pin pole holding device is stored. [Figure 6] 5A and 5B are partial cross-sectional views showing the configuration of the weight connecting part of the pin pole holder, in which FIG. 5A shows the usage state and FIG. [Figure 7] 4A and 4B show the pin pole holding device in a stored state, with FIG. [Figure 8] 13 is a diagram showing the state of use during surveying with a target plate attached to the upper end of a pin pole held by the pin pole holding device. FIG. [Figure 9] FIG. 1 is a diagram showing a typical tripod-type surveying pin pole holding device (first conventional example) shown in Patent Document 1. [Figure 10] 1A and 1B are diagrams showing the structure of a bipod type survey pinpole holding device (second conventional example) 200 described in Patent Document 2, where (a) is a front view and (b) is a side view. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] A survey pinpole holding device according to an embodiment of the present invention will be described. Figures 1 and 2 are perspective views showing the configuration of a survey target holding device 1, and in particular Figure 1 shows a state in which a pinpole 10 has been adjusted to be vertical, and Figure 2 shows a state in which the pinpole is being adjusted to be vertical. This survey target holding device 1 is composed of a pinpole holding part 31 in which the pinpole 10 is fitted, a pinpole holder 30 having a first support part 32 and a second support part 33 for holding a first support rod 11 and a second support rod 12, the first support rod 11 and the second support rod 12, a weight 40 for balancing to prevent tipping, a weight holder 41 for suspending and supporting the weight 40 so as to be rotatable, and a weight guide rod 42 for guiding the weight holder 41 so as to be slidable. The pinpole 10, the first support rod 11, and the second support rod 12 are, for example, metal rods or metal pipes such as stainless steel, and commercially available products can be used. The pin pole 10, the first support rod 11 and the second support rod 12 may be a single body, or may be a combination of a number of rods or pipes of a given length each having male and female threads at the end. Furthermore, the weight 40 may be a commercially available product.

[0021] The pin pole holder 30 has a substantially Y-shaped planar shape, and the pin pole holding part 31, the first support rod 11, and the second support rod 12 are provided near each vertex of the Y shape, respectively, and the pin pole 10, the first support rod 11, and the second support rod 12 form a three-point support structure. As shown in FIG. 4, the center line C1 of the pin pole holder 30 connecting the pin pole 10 and the weight 40 or the pin pole holding part 31 and the weight guide rod 42 passes between the position of the first support part 32 and the second support part 33. The length of the first support rod 11 and the length of the second support rod 12 are different, and the position of the first support part 32 and the position of the second support part 33 are set asymmetrically with respect to the center line C1 of the pin pole holder 30. Therefore, the pin pole 10 and the first support rod 11 and the second support rod 12 are unlikely to interfere with each other. In addition, a target such as a surveying prism target 20 is attached to the pin pole 10, and it is slidable along the central axis of the pin pole 10 and can be fixed at any position.

[0022] FIG. 3 is a plan view of the target holding device 1, and FIG. 4 is a plan view of the pinpole holder 30. FIG. 5 is a partial cross-sectional view showing the configuration of the pinpole holding part 31 and the first support part 32 or the second support part 33 of the pinpole holder 30. As shown in FIG. 3 and FIG. 4, the pinpole holder 30 has a substantially Y-shaped plane, and the pinpole holding part 31 is provided near one vertex of the Y-shape. The pinpole holding part 31 is, for example, a cylindrical through hole, and in order to accommodate a plurality of types of pinpole with different outer diameters, for example, outer diameters of 6 mm and 9 mm, an insert part 31a having an inner diameter corresponding to the outer diameter of the pinpole 10 is fitted into the pinpole holder 30. The inner diameter of the insert part 31a is larger than the outer diameter of the pinpole 10 by a predetermined tolerance, and the pinpole holder 30 can slide in the central axis direction of the pinpole 10, and when the pinpole 10 is fixed to the pinpole holder 30 via the insert part 31a, the central axis of the pinpole 10 is perpendicular to a reference plane 30a of the pinpole holder 30 described later. A fixing screw 31b is provided on the side surface of the pin pole holding portion 31 for fixing the pin pole holder 30 at a desired position relative to the pin pole 10.

[0023] In addition, the pin pole holder 30 has the pin pole holding part 31 as the first vertex P1 of the triangle T, and the first support part 32 and the second support part 33 are provided at the positions of the second vertex P2 and the third vertex P3 constituting the triangle T, which constitute the triangle T. In FIG. 4, the center point of the pin pole holder 30 is P0, the center line is C1, and the straight line C2 connecting the center point P0 and the second vertex P2 and the straight line C3 connecting the center point P0 and the third vertex P3 are set to form 130 degrees with respect to the center line C1. In addition, the distance L1 between the first vertex P1 and the second vertex P2 and the distance L2 between the first vertex P1 and the third vertex P3 are different (for example, L1>L2). As a result, the second vertex P2 and the third vertex P3 of the triangle T are asymmetric with respect to the center line C1, and the triangle T is neither an equilateral triangle nor an isosceles triangle, but a scalene triangle. In this embodiment, triangle T is a scalene triangle, but there is no problem if it is an equilateral triangle or an isosceles triangle, except for the possibility of interference between the pin pole 10 and the first support rod 11 and / or the second support rod 12, as described below.

[0024] As shown in Figures 3 and 5, the first support part 32 and the second support part 33 are respectively composed of a pair of parallel guide arms 32a, 32b and 33a, 33b protruding outward from the pin pole holder 30, support rod holders 32c, 33c that slidably hold the first support rod 11 and the second support rod 12 and are rotatably held between the pair of guide arms 32a, 32b and 33a, 33b around central axes S1, S2 parallel to the reference plane 30a formed by the triangle T, and fixing screws 32d, 33d that fix the first support rod 11 and the second support rod 12 to the support rod holders 32c, 33c. The first support rod 11 and the second support rod 12, which are slidably held by the support rod holders 32c, 33c, slide within the fitting holes 36 of the support rod holders 32c, 33c as the support rod holders 32c, 33c rotate, and oscillate or rotate in a direction perpendicular to the reference plane 30a formed by the triangle T (see arrows C and D in Figure 3).

[0025] The pin pole holding device 1 is provided with a weight 40 for balancing the pin pole 10 while holding it vertically. As shown in FIG. 3, the pin pole holder 30 is provided with a weight connecting portion 34 for connecting the weight 40. As shown in FIG. 1 or FIG. 2, the weight 40 is rotatably held by the weight guide rod 42 via the weight holder 41. Also, as shown in FIG. 3 and FIG. 6, one end 42a of the weight guide rod 42 is fixed by press-fitting or screwing to a rotating member 44 held by a slide member 43 rotatably around an axis 44a as a central axis. As shown in FIG. 3, FIG. 4 and FIG. 6, a guide groove 34a for slidably guiding the slide member 43 is formed inside the pin pole holder 30. Also, a through-fixing groove 34b is formed in the pin pole holder 30, which penetrates from the guide groove 34a toward the reference surface 30a and through which the fixing screw 35 penetrates. The slide member 43 is formed with a screw hole (female screw) 43a that screws with the fixing screw (male screw) 35, and the slide member 43 is fixed at an arbitrary position of the guide groove 34a by tightening the fixing screw 35 from the reference surface 30a side of the pin pole holder 30. The weight connecting part 34 is composed of the weight holder 41, the weight guide rod 42, the slide member 43, the rotating member 44, the guide groove 34a, the through fixing groove 34b, and the fixing screw 35. As shown in FIG. 3, the weight connecting part 34 is provided between the first support part 32 and the second support part 33 that form a Y shape of the pin pole holder 30. As shown in FIG. 3 and FIG. 4, a circular recess 51 is formed on the reference surface 30a of the pin pole holder 30 and in the vicinity of the pin pole holding part 31, and a level 50 is attached thereto.

[0026] In FIG. 6, (a) shows the target holding device 1 in use, and (b) shows the target holding device 1 in storage. In FIG. 6(a), the slide member 43 is pushed into the guide groove 34a of the pin pole holder 30, and the rotating member 44 is also pulled into the guide groove 34a. When the rotating member 44 is pulled into the guide groove 34a, it abuts against the edge 34c of the opening of the guide groove 34a of the pin pole holder 30 and rotates in a direction perpendicular to the reference surface 30a. As a result, the weight guide rod 42 fixed to the rotating member 44 is held so as to be approximately parallel to the reference surface 30a. On the other hand, in FIG. 6(b), the slide member 43 is pulled out so that the rotating member 44 protrudes outward from the guide groove 34a of the pin pole holder 30, and the rotating member 44 rotates due to the weight of the weight 40, and the weight guide rod 42 hangs down so as to be approximately vertical.

[0027] 7 shows the target holding device 1 in a stored state, (a) being a front view and (b) being a side view. When storing the target holding device 1, the fixing screw 35 of the weight connecting part 34 of the pin pole holder 30 is loosened in advance as shown in FIG. 6(b), and the slide member 43 is moved outward. The rotating member 44 is protruded to the outside of the pin pole holder 30, and the weight guide rod 42 and the weight 40 are allowed to hang down so as to be almost vertical by the weight of the weight 40. Next, the fixing screw 31b that fixed the pin pole 10 to the pin pole holding part 31 of the pin pole holder 30, and the fixing screws 32d and 33d of the first support part 32 and the second support part 33 are loosened, respectively, and the pin pole holder 30 is lifted upward to hold the pin pole 10 almost vertically. Since gravity acts vertically downward on the first support rod 11 and the second support rod 12, when the pin pole holder 30 is lifted upward, the support rod holders 32c and 33c rotate vertically as shown in Fig. 5(a), and the first support rod 11 and the second support rod 12 also slide in the fitting holes of the support rod holders 32c and 33c due to their own weights. As shown in Fig. 5(c) and Fig. 7, the target holding device 1 is fixed in the stored state by tightening the fixing screws 31b, 32d and 33d while the pin pole 10, the first support rod 11 and the second support rod 12 are held substantially parallel and substantially vertical.

[0028] On the other hand, when using the target holding device 1, the worker loosens the fixing screws 31b, 32d, and 33d from the state shown in Fig. 5(c) and Fig. 7, slides the pin pole holding part 31 of the pin pole holder 30 and the pin pole 10 relatively while watching the scale provided on the pin pole 10, and tightens the fixing screw 31b at a desired position to fix the pin pole 10 and the pin pole holder 30. Then, as shown in Fig. 2, the pin pole 10 is lifted up approximately vertically by operating the vicinity of the top of the pin pole 10. In addition, the first support rod 11 and the second support rod 12 are inclined so that the lower end of the pin pole 10 and the lower ends of the first support rod 11 and the second support rod 12 form a triangle of an appropriate size on the ground. As in the above case, as shown in Fig. 5(a), the first support rod 11 and the second support rod 12 are pulled vertically downward by the action of gravity, so that the support rod holders 32c and 33c rotate vertically following the inclination of the pin pole 10 and the pin pole holder 30 fixed thereto, and the first support rod 11 and the second support rod 12 also slide in the fitting holes of the support rod holders 32c and 33c, respectively, and change their inclination angle or posture. As described above, the level 50 is provided near the pin pole holding part 31 on the reference surface 30a of the pin pole holder 30. Therefore, the worker tilts the top part of the pin pole 10 in the direction of arrow A or arrow B while looking at the level 50, and adjusts so that the central axis of the pin pole is vertical. As shown in Fig. 1 and Fig. 5(b), with the pin pole 10 in a vertical position, the fixing screws 32d and 33d are tightened to fix the first support rod 11 and the second support rod 12 to the first support part 32 and the second support part 33, respectively. Next, as shown in Fig. 6(a), the slide member 43 is pushed all the way into the guide groove 34a of the pin pole holder 30, and the rotating member 44 is drawn into the guide groove 34a. As a result, the weight guide rod 42 fixed to the rotating member 44 is held so as to be substantially parallel to the reference surface 30a.

[0029] In the pin pole holding device 1 according to the present invention, as shown in FIG. 1, the pin pole 10 is held vertically, and the weight 40 is provided on the opposite side of the pin pole 10 with respect to the center P0 (see FIG. 4) of the pin pole holder 30 that holds the pin pole 10. Therefore, even if a force is applied in the direction of the arrow X, the gravity acting on the weight 40 generates a reaction force against the force in the direction of the arrow X, so that the pin pole holding device 1 is less likely to fall over. In addition, in the pin pole holding device 1 according to the present invention, the triangle T that forms the reference plane 30a of the pin pole holder 30 is a scalene triangle. The triangle T may be an equilateral triangle or an isosceles triangle, but since the positions of the first support part 32 and the second support part 33 are symmetrical with respect to the center line C1 of the pin pole holder 30, when the first support rod 11 and the second support rod 12 are inclined, the first support rod 11 and the second support rod 12 may come into contact with the pin pole 10 depending on the inclination angle, causing spatial interference. In this case, the contact between the first support rod 11 and / or the second support rod 12 and the pin pole 10 can be eliminated by changing the position of the pin pole holder 30 relative to the pin pole 10, for example by lifting it up. On the other hand, by making the positions of the first support part 32 and the second support part 33 asymmetrical with respect to the center line C1 of the pin pole holder 30, the possibility that the first support rod 11 and the second support rod 12 will contact the pin pole 10 and spatially interfere with each other can be reduced. Furthermore, by appropriately selecting the distances L1 and L2 between the pin pole holding part 31 that holds the pin pole 10 and the first support part 32 and the second support part 33 that hold the first support rod 11 and the second support rod 12, or by appropriately changing the length of the first support rod 11 and the length of the second support rod 12, the possibility that the first support rod 11 and the second support rod 12 will contact the pin pole 10 can be eliminated.

[0030] In addition, when the pin pole 10 is fixed to the pin pole holding part 31 of the pin pole holder 30 and the fixing screws 32d and 33d of the first support part 32 and the second support part 33 are loosened, the first support rod 11 and the second support rod 12 are practically in a free state, and when the pin pole 10 is tilted, the posture of the first support rod 11 and the second support rod 12 automatically changes following the tilt of the pin pole holder 30. Therefore, when the pin pole 10 becomes vertical, the fixing screws 32d and 33d of the first support part 32 and the second support part 33 are tightened to fix the first support rod 11 and the second support rod 12 to the first support part 32 and the second support part 33 of the pin pole holder 30, the pin pole 10 is held in a vertical state. Compared to the conventional pin pole holding device 100 or 200, there is no need to adjust the length of the legs, and the vertical adjustment of the pin pole 10 is extremely simple and easy. Furthermore, since the spirit level 50 is provided near the pin pole holding portion 31 on the reference surface 30a of the pin pole holder 30 which is perpendicular to the central axis of the pin pole 10, the pin pole 10 can be adjusted vertically while looking only at this spirit level 50, simplifying the adjustment work and shortening the time required for adjustment.

[0031] FIG. 8 shows a state of use during surveying in which a laser surveying target 60 is attached to the upper end of a pinpole 10 held by a pinpole holding device 1. In the example shown in FIG. 8, the laser surveying target 60 is composed of a target plate 61, an arm 62 that holds the target plate 61 rotatably around a predetermined rotation axis (horizontal axis), and a shaft portion 63 for attaching the target plate 61 and the arm 62 to the pinpole 10. A male screw is formed on the upper end 10a of the pinpole 10, and a female screw is formed on the shaft portion 63 (not shown as they are well-known structures), and when the pinpole 10 is held vertically, the target plate 61 is also held vertically. The target plate 61 has a certain surface area so that it can be easily recognized by a laser scanner device or a total station installed at a distance. On the other hand, the pinpole 10 and the laser surveying target 60 are installed outdoors, and are therefore susceptible to the effects of wind. As described above, in the pin pole holding device 1 of the present invention, the weight 40 is provided on the extension line of the center line C1 of the pin pole holder 30, so that even if wind hits the target plate 61 in the X direction, the pin pole 10 and the laser surveying target 60 are less likely to fall over. [Explanation of symbols]

[0032] 1 Pin pole holding device for surveying 10 Pin Pole 11 1st support rod 12 Second support rod 20 Prism Target 30 Pin Pole Holder 31 Pin pole holder 31a Insert parts 32 1st support part 32a, 32b Guide arm 32c Support rod holder 32d Fixing screw 33 Second support part 33a, 33b Guide arm 33c Support rod holder 33d Fixing screw 34 Weight connection part 34a Guide groove 34b Penetration fixing groove 35 Fixing screw 36 Fitting hole 40 weight 41 Weight holder 42 Weight guide rod 43 Slide member 44 Rotating members 45 Fixed axis 50 Level 60 Laser Survey Target

Claims

1. A pin pole holder that is fixed perpendicular to the central axis of the pin pole; a first support rod and a second support rod fitted in the pin pole holder to support the pin pole; A weight is provided for balancing the pin pole while the pin pole is being held, The pin pole holder is a pin pole holding portion into which the pin pole is fitted; a first support portion and a second support portion that are provided at the other two vertices of a triangle, with the pin pole holding portion being one vertex of the triangle, and that hold the first support rod and the second support rod rotatably in a direction perpendicular to a reference plane formed by the triangle; A weight connecting portion for connecting the weight; having A center line of the pin pole holder connecting the pin pole holding portion and the weight connecting portion passes between the first support portion and the second support portion. A surveying pin pole holding device characterized by the above.

2. 2. The surveying pin pole holding device according to claim 1, further comprising a spirit level provided near the pin pole holding portion on the upper surface of the pin pole holder.

3. A surveying pinpole holding device as described in claim 1 or claim 2, characterized in that the pinpole holder is approximately Y-shaped when viewed from a direction perpendicular to the reference plane, and the three vertices of the triangle are each located near the three vertices of the approximately Y-shape.

4. A surveying pinpole holding device as described in any one of claims 1 to 3, characterized in that the triangle is a scalene triangle, and the distance between the pinpole holding portion and the first support portion is different from the distance between the pinpole holding portion and the second support portion.

5. 5. A surveying pin pole holding device according to claim 1, wherein the first support rod and the second support rod have different lengths.

6. A surveying pin pole holding device as described in any one of claims 1 to 5, characterized in that the first support part and the second support part respectively comprise a support rod fitting hole into which the first support rod and the second support rod are fitted, a support rod holder having a rotation axis perpendicular to the central axis of the support rod fitting hole, a bearing part formed on the pin pole holder so as to protrude outward from the apex of the triangle and holding the rotation axis of the support rod holder parallel to the reference plane, and a support rod fixing screw that fixes the first support rod and the second support rod to the support rod holder.

7. A surveying pin pole holding device as described in any one of claims 1 to 6, characterized in that the weight connecting portion comprises a weight holder that rotatably supports the weight, a weight guide rod that guides the weight holder slidably, a rotating member into which one end of the weight guide rod is fitted and fixed, a sliding member that rotatably holds the rotating member, and a guide groove formed inside the pin pole holder and slidably guides the sliding member.

8. A surveying pin pole holding device as described in any one of claims 1 to 7, characterized in that the pin pole holding portion is fitted with an insert part having an inner diameter corresponding to the outer diameter of the pin pole, in order to accommodate a plurality of types of pin poles having different outer diameters.

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