Auxiliary support for observing target in geodetic survey
By designing auxiliary supports for the support and adjustment mechanisms, the problem of difficult adjustment of the support feet was solved, achieving stable support on uneven ground and adjustment of the surveying instrument angle, thus improving the accuracy and efficiency of geodetic surveying.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 贾奇
- Filing Date
- 2025-06-12
- Publication Date
- 2026-04-24
AI Technical Summary
The support legs of existing geodetic observation target auxiliary supports are difficult to adjust flexibly according to the actual flatness of the ground. This causes the supports to sway or tilt when used on uneven ground, affecting the accuracy and reliability of the survey data, and thus affecting the quality and efficiency of geodetic work.
An auxiliary support system including a support mechanism and an adjustment mechanism was designed. Through a gear and rack transmission structure and the telescopic adjustment of the insertion rod, it achieves adaptive support to the ground. The angle adjustment of the surveying instrument is driven by a motor to meet different measurement needs.
Providing a stable measurement platform in complex terrain ensures the accuracy of the surveying instrument's measurement benchmark, improves the stability and applicability of measurements, and reduces the time and manpower required for manual adjustments.
Smart Images

Figure CN224162328U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of measurement support technology, specifically to an auxiliary support for geodetic observation targets. Background Technology
[0002] Geodesy is a surveying activity conducted to establish and maintain surveying benchmarks and systems to determine the location, shape, gravity field, and their changes over time and space of the Earth. Geodesy involves precise measurements to determine the location of ground points, the shape and size of the Earth, and the Earth's gravity field. It includes triangulation, precise traverse surveying, leveling, astronomical surveying, satellite geodesy, gravity surveying, and geodetic calculations.
[0003] According to Chinese Patent Publication No. CN221684017U3, an auxiliary support for geodetic observation targets is disclosed, including a measuring support base with multiple support feet. A measuring instrument is fixedly installed on the top side of the measuring support base. A circular groove is formed on the top side of the measuring support base, and a circular frame is movably installed in the groove. A frame groove is formed on the top side of the circular frame, and a first magnetic ring is fixedly installed in the frame groove. A top cover is inserted into the top side of the circular frame, and a cover groove is formed on the bottom side of the top cover, where a second magnetic ring is fixedly installed. This invention allows the top cover, which is adsorbed in the placement groove, to be removed and placed on the circular frame. The top cover and the circular frame then enclose the measuring instrument, preventing rain and snow from falling on it, reducing the risk of damage due to water ingress, maintaining the normal function of the measuring instrument, and ensuring the accuracy of the geodetic measurement data.
[0004] In actual surveying sites, the terrain is often complex, and the ground has varying degrees of unevenness, such as local depressions and protrusions. The support legs of the aforementioned geodetic observation target auxiliary support are difficult to adjust flexibly according to the actual flatness of the ground. As a result, when used on uneven ground, the support is prone to shaking or tilting, which cannot provide a stable and reliable surveying platform for the surveying instrument. This seriously affects the accuracy and reliability of the surveying data, and consequently affects the quality and efficiency of the entire geodetic surveying work. Utility Model Content
[0005] To overcome the shortcomings of existing technologies, this utility model proposes an auxiliary support for geodetic observation targets. This addresses the problem that the support legs are difficult to adjust flexibly according to the actual flatness of the ground, causing the support to sway or tilt when used on uneven ground. This results in the support failing to provide a stable and reliable measurement platform for the surveying instrument, which seriously affects the accuracy and reliability of the surveying data, and consequently the quality and efficiency of the entire geodetic surveying work.
[0006] The technical solution adopted by this utility model to solve its technical problem is:
[0007] A geodetic observation target auxiliary support includes a support mechanism, and an adjustment mechanism is provided on the top of the support mechanism;
[0008] The support mechanism includes a connecting frame, a connecting rod fixedly connected to the inner side of the connecting frame, a support rod rotatably connected to the surface of the connecting rod, a connecting hole being opened at the end of the support rod away from the connecting rod, a spring fixedly connected to the inner side of the connecting hole, a movable block fixedly connected to the end of the spring away from the inner side of the connecting hole, a rack plate fixedly connected to the bottom of the movable block, an insert rod fixedly connected to the end of the rack plate away from the movable block, fixed rods rotatably connected to both sides of the support rod, the same rack rod being fixedly connected to the inner side of the two fixed rods, and a knob fixedly connected to the front end of the fixed rod.
[0009] The adjustment mechanism includes a support frame, a motor is installed inside the support frame, a connecting plate is fixedly connected to the output end of the motor, a surveying instrument is fixedly connected to the top of the connecting plate with screws, a counterweight and a battery are fixedly connected to the front and rear ends of the support frame respectively, and a level is fixedly connected to the bottom of the support frame.
[0010] Preferably, three connecting frames are provided, and the three connecting frames are fixedly connected to the bottom of the support frame and distributed in a circular array.
[0011] Preferably, the rack plate meshes with the rack rod, and the movable block, rack plate, and insert rod are all movably connected in the connecting hole opened at one end of the support rod.
[0012] Preferably, the surface of the support frame is provided with a plurality of perforated ventilation holes.
[0013] Preferably, both the motor and the surveying instrument are electrically connected to the battery.
[0014] Preferably, the outer surface of the knob is provided with anti-slip texture.
[0015] Preferably, a charging interface is provided at the rear of the support frame, and the charging interface is electrically connected to the battery.
[0016] Compared with existing technologies, the beneficial effects of this utility model of an auxiliary support for geodetic observation targets are:
[0017] First, rotate the support rods at the bottom of the three connecting frames outwards around the connecting rods to extend the support rods to a suitable angle, providing a stable support foundation for the bracket. Inside the connecting holes of the support rods, the rack plate and rack rod mesh tightly, forming a gear and rack transmission structure. When the knob is turned, it will drive the fixed rods fixedly connected to it to rotate synchronously. Since the two fixed rods are fixedly connected to the same rack rod on their inner sides, the rack rod will rotate with the rotation of the knob. When the rack rod rotates, it will push the meshing rack plate to move linearly within the connecting holes. One end of the rack plate is fixedly connected to a movable block, which is in turn connected to a spring. The other end of the spring is fixed inside the connecting hole. When the rack plate moves, it causes the movable block to compress or stretch the spring, simultaneously pushing the insertion rod to extend or retract the support rod. After placing the auxiliary support in the measurement position, the operator needs to observe the ground conditions and determine the flatness of the ground. For example, if a depression is found on one side of the ground, the insertion rod under the corresponding support rod on that side needs to extend a longer length. If there is a bump in the ground, the extension length of the corresponding insertion rod can be appropriately shortened. For each support rod, the operator can adjust the extension length of the rod by individually turning the corresponding knob. For example, when the left side of the ground is lower, turning the knob on the left support rod will rotate the rack and pinion, pushing the left rod to extend a longer distance until it is inserted into the ground to a certain depth, providing stable support for the support frame. Similarly, the rods under other support rods are adjusted accordingly to ensure that all three rods can adapt to uneven ground conditions, ensuring that the support frame is stable and level. By observing the level indicator fixed to the bottom of the support frame, it can be determined whether the support frame is level. If the support frame is not level, the extension length of each rod can be adjusted to make the level indicator show a level state, ensuring the accuracy of the surveying instrument's measurement benchmark. By adjusting the extension length of each rod according to the flatness of the ground, the three support points of the support frame can be in close contact with the ground and obtain sufficient support force. Even when the ground is uneven, it can effectively prevent the support frame from swaying or tilting, providing a stable measurement platform for the surveying instrument and enabling the auxiliary support frame to better adapt to various complex terrains.
[0018] Secondly, the surveying instrument is fixed to the top of the connecting plate with screws to complete the installation. The motor installed in the support frame is then started. The motor output drives the connecting plate to rotate, which in turn drives the surveying instrument to rotate, thereby adjusting the angle of the surveying instrument to meet the needs of different measurement directions and angles. Both the motor and the surveying instrument are electrically connected to the battery, which provides power to ensure that the motor and the surveying instrument can work normally. When the battery power is low, it can be charged through the charging interface set at the rear of the support frame. The charging interface is electrically connected to the battery, making it convenient to replenish the power at any time. The angle of the surveying instrument can be flexibly adjusted to meet the needs of different measurement directions and angles, improving the versatility and applicability of the bracket. There is no need for manual adjustment of the surveying instrument position, saving time and manpower. Attached Figure Description
[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0020] Figure 2 This is a three-dimensional structural diagram of the present invention;
[0021] Figure 3 This is a partial three-dimensional structural diagram of the present invention;
[0022] Figure 4 This utility model Figure 3 Enlarged structural diagram at point A in the middle;
[0023] Figure 5 This is a schematic cross-sectional view of the present invention.
[0024] Figure 6 This utility model Figure 5 Enlarged structural diagram at point B.
[0025] The components are as follows: 1. Support mechanism; 101. Connecting frame; 102. Connecting rod; 103. Support rod; 104. Spring; 105. Movable block; 106. Rack plate; 107. Insert rod; 108. Fixed rod; 109. Rack rod; 110. Knob; 2. Adjustment mechanism; 201. Support frame; 202. Motor; 203. Connecting plate; 204. Surveying instrument; 205. Counterweight; 206. Battery; 207. Level; 208. Charging interface. Detailed Implementation
[0026] The specific embodiments of this utility model will now be described in further detail with reference to the accompanying drawings.
[0027] For an auxiliary support frame for a geodetic observation target under this specific implementation, please refer to [link / reference needed]. Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 An auxiliary support for a geodetic observation target includes a support mechanism 1, and an adjustment mechanism 2 is provided on the top of the support mechanism 1;
[0028] The support mechanism 1 includes a connecting frame 101. A connecting rod 102 is fixedly connected to the inner side of the connecting frame 101. A support rod 103 is rotatably connected to the surface of the connecting rod 102. A connecting hole is opened at the end of the support rod 103 away from the connecting rod 102. A spring 104 is fixedly connected to the inner side of the connecting hole. A movable block 105 is fixedly connected to the end of the spring 104 away from the inner side of the connecting hole. A rack plate 106 is fixedly connected to the bottom of the movable block 105. An insert rod 107 is fixedly connected to the end of the rack plate 106 away from the movable block 105. Fixed rods 108 are rotatably connected to both sides of the support rod 103. The same rack rod 109 is fixedly connected to the inner side of the two fixed rods 108. A knob 110 is fixedly connected to the front end of the fixed rod 108.
[0029] Through the above technical solution, the support rods 103 at the bottom of the three connecting frames 101 are rotated outward around the connecting rod 102, so that the support rods 103 are unfolded to a suitable angle, providing a stable support foundation for the bracket. In the connecting hole of the support rod 103, the rack plate 106 and the rack rod 109 are tightly meshed to form a gear and rack transmission structure. When the knob 110 is rotated, it will drive the fixed rod 108 fixedly connected to it to rotate synchronously. Since the same rack rod 109 is fixedly connected to the inner side of the two fixed rods 108, the rack rod 109 will rotate with the rotation of the knob 110. When the rack rod 109 rotates, it will push the meshing gears. The rack plate 106 moves linearly within the connecting hole. One end of the rack plate 106 is fixedly connected to the movable block 105, which is in turn connected to the spring 104. The other end of the spring 104 is fixed inside the connecting hole. When the rack plate 106 moves, it causes the movable block 105 to compress or stretch the spring 104, simultaneously pushing the insertion rod 107 to extend or retract the support rod 103. After placing the auxiliary support at the measurement position, the operator needs to first observe the ground conditions and determine the flatness of the ground. For example, if a depression is found on one side of the ground, the insertion rod 107 below the corresponding support rod 103 on that side needs to extend a longer length. If the ground has a convex shape... If the ground is uneven, the extension length of the corresponding insertion rod 107 can be appropriately shortened. For each support rod 103, the operator can adjust the extension length of the insertion rod 107 by individually rotating the corresponding knob 110. For example, when the left side of the ground is lower, rotating the knob 110 on the left support rod 103 will rotate the rack rod 109, pushing the left insertion rod 107 to extend a longer distance until it is inserted into the ground to a certain depth, providing stable support for the bracket. Similarly, the insertion rods 107 under other support rods 103 are also adjusted accordingly so that all three insertion rods 107 can adapt to uneven ground conditions, ensuring that the bracket as a whole is in a stable and level state. Observe the level 207 fixedly connected to the bottom of the support frame 201 to determine whether the support is in a horizontal state. If the support is not horizontal, the extension length of each plug 107 can be adjusted to make the level 207 show a horizontal state, ensuring that the measurement benchmark of the surveying instrument 204 is accurate. By adjusting the extension length of each plug 107 according to the flatness of the ground, the three support points of the support can be in close contact with the ground and obtain sufficient support force. Even when the ground is uneven, it can effectively prevent the support from shaking or tilting, providing a stable measurement platform for the surveying instrument 204, so that the auxiliary support can better adapt to various complex terrains.
[0030] The adjustment mechanism 2 includes a support frame 201, a motor 202 installed inside the support frame 201, a connecting plate 203 fixedly connected to the output end of the motor 202, a surveying instrument 204 fixedly connected to the top of the connecting plate 203 with screws, a counterweight 205 and a battery 206 fixedly connected to the front and rear ends of the support frame 201 respectively, and a level 207 fixedly connected to the bottom of the support frame 201.
[0031] Through the above technical solution, the surveying instrument 204 is fixedly connected to the top of the connecting plate 203 with screws, completing the installation of the surveying instrument 204. The motor 202 installed in the support frame 201 is started, and the output end of the motor 202 drives the connecting plate 203 to rotate, thereby driving the surveying instrument 204 to rotate, thus adjusting the angle of the surveying instrument 204 to meet the needs of different measurement directions and angles. Both the motor 202 and the surveying instrument 204 are electrically connected to the storage battery 206, which provides power to them to ensure that the motor 202 and the surveying instrument 204 can work normally. When the storage battery 206 is low on power, it can be charged through the charging interface 208 set at the rear of the support frame 201. The charging interface 208 is electrically connected to the storage battery 206, which facilitates the replenishment of power at any time. The angle of the surveying instrument 204 can be flexibly adjusted to meet the needs of different measurement directions and angles, improving the versatility and applicability of the bracket. There is no need for manual adjustment of the position of the surveying instrument 204, saving time and manpower.
[0032] Specifically, there are three connecting frames 101, which are fixedly connected to the bottom of the support frame 201 in a circular array.
[0033] Through the above technical solution, in the support mechanism 1 of the auxiliary support, three connecting frames 101 are evenly fixedly connected to the bottom of the support frame 201 and are distributed in a circular array. The circular array distribution means that the three connecting frames 101 are evenly spaced on the circumference with the center of the bottom of the support frame 201 as the center. This distribution method can provide a stable and uniform support force for the support frame 201, ensuring that the entire auxiliary support is more stable when placed, avoiding swaying or tilting due to uneven distribution of support force, thereby providing a stable working platform for the surveying instrument 204 and ensuring the accuracy of the geodetic observation target.
[0034] Specifically, the rack plate 106 meshes with the rack rod 109, and the movable block 105, the rack plate 106, and the insert rod 107 are all movably connected to the connecting hole opened at one end of the support rod 103.
[0035] Through the above technical solution, firstly, the rack plate 106 and the rack rod 109 are connected by meshing. This meshing relationship allows the rack plate 106 to move synchronously when the rack rod 109 moves, thereby realizing the transmission of power or motion. Secondly, the movable block 105, the rack plate 106, and the insert rod 107 are integrated as a whole component, all of which are movably connected to the connecting hole opened at one end of the support rod 103. Here, "movable connection" means that these components can move to a certain extent within the connecting hole, but are restricted by the connecting hole and will not detach from the support rod 103. This allows the insert rod 107 to extend or retract from the connecting hole as needed through the meshing movement of the rack plate 106 and the rack rod 109. When the auxiliary bracket needs to be fixed to the ground or other objects, the insert rod 107 extends and inserts into the corresponding position to enhance the stability of the bracket. When the position of the bracket needs to be moved or adjusted, the insert rod 107 can retract for easy operation.
[0036] Specifically, the surface of the support frame 201 has multiple perforated ventilation holes evenly distributed.
[0037] Through the above technical solution, multiple perforated ventilation holes are evenly opened on the surface of the support frame 201. The evenly opened ventilation holes have many important functions. On the one hand, the ventilation holes can increase the air circulation inside the support frame 201. Since the support frame 201 is equipped with components such as motor 202, counterweight 205, and battery 206, these components may generate heat during operation. The presence of ventilation holes allows air to flow freely inside and outside the support frame 201, dissipating the heat generated inside in a timely manner and avoiding the components from overheating due to heat accumulation, which would affect their performance and lifespan. On the other hand, the ventilation holes can also reduce the overall weight of the support frame 201. While ensuring structural strength, the auxiliary support is lighter, easier to carry and move, and improves the efficiency of geodetic surveying work.
[0038] Specifically, both the motor 202 and the surveying instrument 204 are electrically connected to the battery 206.
[0039] Through the above technical solution, the storage battery 206 serves as a power source, providing the necessary electrical energy to the motor 202 and the surveying instrument 204. For the motor 202, the electrical energy provided by the storage battery 206 drives its output end to rotate, thereby driving the connecting plate 203 and the surveying instrument 204 fixed on it to rotate, realizing the horizontal angle adjustment of the surveying instrument 204 to meet the needs of different measurement angles. For the surveying instrument 204 itself, the storage battery 206 provides power support for its normal operation, enabling it to perform various geodetic surveying and observation tasks, such as angle measurement and distance measurement. Through this electrical connection method, the entire auxiliary support forms a relatively independent power supply system, without relying on an external power source, improving the applicability and convenience of the auxiliary support in various field environments.
[0040] Specifically, the outer surface of knob 110 is provided with anti-slip texture.
[0041] Through the above technical solution, the outer surface of the knob 110 is provided with anti-slip texture. During the operation of the auxiliary support, the knob 110 serves as an operating component. The user needs to rotate the knob 110 to drive the fixed rod 108 to rotate, thereby controlling the movement of the rack rod 109, and ultimately controlling the extension or retraction of the insertion rod 107. The anti-slip texture significantly increases the friction of the outer surface of the knob 110. When the user operates the knob 110, especially when their hands may be sweaty or the environment is relatively humid, the anti-slip texture can effectively prevent slippage between the hand and the knob 110, allowing the user to rotate the knob 110 more easily and accurately, improving the convenience and reliability of operation.
[0042] Specifically, a charging interface 208 is provided at the rear of the support frame 201, and the charging interface 208 is electrically connected to the battery 206.
[0043] Through the above technical solution, the charging interface 208 set behind the support frame 201 provides users with a convenient way to charge the battery 206. When the battery 206 is low on power, users can connect an external power source, such as a charger or power bank, to the charging interface 208 to transfer electrical energy to the battery 206 and charge it. The electrical connection between the charging interface 208 and the battery 206 ensures that electrical energy can be successfully transferred from the charging interface 208 to the battery 206 for storage.
[0044] Its working principle is as follows:
[0045] Through the above technical solution, the support rods 103 at the bottom of the three connecting frames 101 are rotated outward around the connecting rods 102, so that the support rods 103 are unfolded to a suitable angle, providing a stable support foundation for the bracket. In the connecting holes of the support rods 103, the rack plate 106 and the rack rod 109 are tightly meshed to form a gear and rack transmission structure. When the knob 110 is turned, it will drive the fixed rod 108 fixedly connected to it to rotate synchronously. Since the same rack rod 109 is fixedly connected to the inner side of the two fixed rods 108, the rack rod 109 will rotate with the rotation of the knob 110. When the rack rod 109 rotates, it will push the rack plate 106 meshing with it to make linear motion in the connecting hole. One end of the rack plate 106 is fixedly connected to the movable block 105. The movable block 105 is connected to the spring 104, and the other end of the spring 104 is fixed inside the connecting hole. When the rack plate 106 moves, it will drive the movable block 105 to compress or stretch the spring 104, and at the same time push the insertion rod 107 to extend or retract the support rod 103. After placing the auxiliary bracket in the measurement position, the operator needs to observe the ground condition and judge the flatness of the ground. For example, if a depression is found on one side of the ground, the insertion rod 107 under the corresponding support rod 103 on that side needs to extend a longer length. If there is a bump in the ground, the extension length of the corresponding insertion rod 107 can be appropriately shortened. For each support rod 103, the operator can adjust the extension length of the insertion rod 107 by rotating the corresponding knob 110 individually. For example, when the left side of the ground... When the ground is low, turn the knob 110 on the left support rod 103 to rotate the rack rod 109, pushing the left insertion rod 107 to extend a longer distance until it is inserted into the ground to a certain depth, providing stable support for the bracket. Similarly, adjust the insertion rods 107 under the other support rods 103 accordingly, so that all three insertion rods 107 can adapt to uneven ground, ensuring that the bracket as a whole is stable and level. By observing the level 207 fixedly connected to the bottom of the support frame 201, determine whether the bracket is level. If the bracket is not level, adjust the extension length of each insertion rod 107 until the level 207 shows a level state, ensuring the accuracy of the measurement benchmark of the surveying instrument 204. Fix the surveying instrument 204 to the connecting plate with screws. At the top of support frame 203, the surveying instrument 204 is installed. The motor 202 installed inside support frame 201 is then activated. The output of motor 202 drives the connecting plate 203 to rotate, which in turn drives the surveying instrument 204 to rotate, thereby adjusting the angle of the surveying instrument 204 to meet the needs of different measurement directions and angles. The internal wiring connections of motor 202, surveying instrument 204, and battery 206 are all existing technologies and will not be described in detail here. Both motor 202 and surveying instrument 204 are electrically connected to battery 206, which provides power to them to ensure normal operation. When the battery 206 is low on power, it can be charged through the charging interface 208 located at the rear of support frame 201.The charging port 208 is electrically connected to the battery 206, allowing for convenient charging at any time.
[0046] It should be noted that, although specific embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these specific embodiments without departing from the principles and spirit, the scope of which is defined by the appended claims and their equivalents.
Claims
1. An auxiliary support for a geodetic observation target, comprising a support mechanism (1), characterized in that: The support mechanism (1) is provided with an adjustment mechanism (2) at its top; The support mechanism (1) includes a connecting frame (101), a connecting rod (102) is fixedly connected to the inner side of the connecting frame (101), a support rod (103) is rotatably connected to the surface of the connecting rod (102), a connecting hole is provided at one end of the support rod (103) away from the connecting rod (102), a spring (104) is fixedly connected to the inner side of the connecting hole, a movable block (105) is fixedly connected to one end of the spring (104) away from the inner side of the connecting hole, a rack plate (106) is fixedly connected to the bottom of the movable block (105), a plug rod (107) is fixedly connected to one end of the rack plate (106) away from the movable block (105), a fixed rod (108) is rotatably connected to both the left and right sides of the support rod (103), the same rack rod (109) is fixedly connected to the inner side of the two fixed rods (108), and a knob (110) is fixedly connected to the front end of the fixed rod (108). The adjustment mechanism (2) includes a support frame (201), a motor (202) is installed inside the support frame (201), a connecting plate (203) is fixedly connected to the output end of the motor (202), a surveying instrument (204) is fixedly connected to the top of the connecting plate (203) with screws, a counterweight (205) and a battery (206) are fixedly connected to the front and rear ends of the support frame (201) respectively, and a level (207) is fixedly connected to the bottom of the support frame (201).
2. The auxiliary support for a geodetic observation target according to claim 1, characterized in that: There are three connecting frames (101), and the three connecting frames (101) are fixedly connected to the bottom of the support frame (201) in a circular array.
3. The auxiliary support for a geodetic observation target according to claim 1, characterized in that: The rack plate (106) meshes with the rack rod (109), and the movable block (105), the rack plate (106) and the insert rod (107) are all movably connected in the connecting hole opened at one end of the support rod (103).
4. The auxiliary support for a geodetic observation target according to claim 1, characterized in that: The support frame (201) has multiple hollowed-out ventilation holes evenly distributed on its surface.
5. The auxiliary support for a geodetic observation target according to claim 1, characterized in that: Both the motor (202) and the surveying instrument (204) are electrically connected to the storage battery (206).
6. The auxiliary support for a geodetic observation target according to claim 1, characterized in that: The outer surface of the knob (110) is provided with anti-slip texture.
7. The auxiliary support for a geodetic observation target according to claim 1, characterized in that: A charging interface (208) is provided at the rear of the support frame (201), and the charging interface (208) is electrically connected to the battery (206).
Citation Information
Patent Citations
Auxiliary support for observing target in geodetic survey
CN221684017U