An adjustment structure for a leveling rod

Abstract

This utility model provides an adjustment structure for a leveling rod, belonging to the technical field of architectural surveying devices. It solves the problem of improving the applicability of leveling rods. In this adjustment structure, the leveling rod is vertically positioned and includes horizontally positioned upper and lower base plates, spaced vertically apart. The upper end of the leveling rod is hinged to the upper base plate and axially positioned thereon. The lower base plate has a through-hole that extends through both sides of the lower base plate, with a ball joint inside. The lower end of the leveling rod is hinged to the ball joint. Two mutually perpendicular screws are connected horizontally to the side wall of the lower base plate. Each screw can slide along the length of the corresponding side wall of the lower base plate and is positioned thereon. The inner end of each screw is hinged to the ball joint. Each screw can extend into the through-hole and push the ball joint, causing the leveling rod to swing around the hinge point with the upper base plate. This adjustment structure improves the applicability of the leveling rod.

Description

Technical Field

[0001] This utility model belongs to the technical field of architectural surveying devices and relates to an adjustment structure for a leveling rod. Background Technology

[0002] A leveling rod is a specialized measuring tool used in conjunction with a level instrument in leveling surveying. It is primarily used to determine the elevation differences and heights of points on the ground. Secondly, the leveling rod is also an indispensable teaching tool in surveying training. When used as a teaching tool, to ensure the instructor can explain effectively, the leveling rod is typically placed vertically on a wall and securely nailed in place.

[0003] However, in actual use, the leveling rod needs to be adjusted to adapt to ground with different levels of levelness. In addition, during the teaching process, the instructor also needs to rotate the leveling rod to fully demonstrate its structure to the students. Fixing the leveling rod directly to the wall not only limits the instructor's demonstration, but also means that students can only understand its structure through the instructor's explanation and cannot actually practice it, resulting in poor applicability. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing an adjustment structure for a leveling rod. The technical problem this invention aims to solve is: how to improve the applicability of the leveling rod.

[0005] The objective of this utility model can be achieved through the following technical solution: an adjustment structure for a leveling rod, wherein the leveling rod is vertically arranged, and the adjustment structure includes a horizontally arranged upper base plate and a lower base plate, the upper base plate and the lower base plate being arranged at intervals along the vertical direction, the upper end of the leveling rod being hinged to the upper base plate and axially positioned on the upper base plate, the lower base plate having a rod-through opening, the rod-through opening being arranged through the upper and lower sides of the lower base plate, a ball cup being provided inside the rod-through opening, the lower end of the leveling rod being hinged to the ball cup, two mutually perpendicular screws being connected to the side wall of the lower base plate along the horizontal direction, each screw being able to slide along the length direction of the corresponding side wall of the lower base plate and being positioned on the side wall of the lower base plate, the inner end of each screw being hinged to the ball cup, and each screw being able to extend into the rod-through opening and push the ball cup to make the leveling rod swing around the hinge point with the upper base plate.

[0006] The adjustment structure of this leveling rod uses an upper and lower base plate, spaced apart, as its carrier. The upper and lower base plates are fixed horizontally to the wall. The upper end of the leveling rod is hinged to the bottom surface of the upper base plate, achieving axial positioning of the leveling rod and allowing it to swing circumferentially relative to the hinge. Furthermore, through openings on both sides of the lower base plate, the lower end of the leveling rod can be inserted. A ball joint within the through-hole supports the lower end of the leveling rod. During use, the instructor can hold the leveling rod and rotate it clockwise or counterclockwise. Because both ends are hinged, the leveling rod can be adjusted circumferentially. Additionally, two perpendicular screws are installed on the side wall of the lower base plate. Both screws extend into the leveling rod opening and are hinged to the lower end of the ball cup. While ensuring the ball cup remains stable within the leveling rod opening, the leveling rod can be forced to oscillate around the upper hinge by turning either screw. To avoid interference between the other screw and the ball cup when adjusting one screw, both screws are designed to slide along the length of the corresponding sidewall of the lower base plate. This allows the other screw to slide and adjust accordingly as the ball cup moves when one screw is adjusted to oscillate. This ensures that both screws remain connected to the ball cup while avoiding interference, allowing the leveling rod to be adjusted both circumferentially (rotating and oscillating). This provides instructors with ample opportunity to demonstrate the technique and allows students to practice more effectively, making it more versatile.

[0007] In the aforementioned leveling rod adjustment structure, the lower base plate is a square plate, and elongated guide holes are provided on adjacent side walls of the lower base plate. A slider is slidably connected to each guide hole, and two screws are screwed one-to-one with the two sliders. Specifically, each screw is connected to the slider slidably connected in the guide hole by screwing, and the inner end slides forward or backward axially through the threaded engagement, thereby pushing or pulling the ball cup to cause the lower end of the leveling rod to swing. Utilizing the cooperation of the guide holes and sliders, when one screw is turned, the other screw can drive the slider located in the other guide hole to perform an adaptive sliding action, thus avoiding interference.

[0008] In the aforementioned leveling rod adjustment structure, each of the guide holes is curved upwards into an arc shape. When the lower end of the leveling rod swings, the upper end remains in an axially positioned state. Therefore, the leveling rod is not at the same height when it is vertical and when it is tilted. By setting each guide hole as an arc shape, the height of the adjusting screw corresponding to the sliding of the slider can be adjusted, thereby further avoiding interference.

[0009] In the aforementioned leveling adjustment structure, each slider protrudes from the outer end of the guide hole, and each slider has a plate-shaped positioning part at its top. The positioning part fits against the outer wall of the lower base plate, and a positioning hole is formed on the plate surface of the positioning part. The screw is screwed to the slider, and a positioning screw that can abut against the outer wall of the lower base plate is screwed into the positioning hole. The positioning part allows the slider to be locked after adjustment by the locking force between the positioning screw and the outer wall of the lower base plate.

[0010] In the aforementioned leveling adjustment structure, two mutually perpendicular mating rods are fixed on the outer wall of the ball cup, and the inner ends of the two screws are hinged to the two mating rods respectively. As a further solution, by setting two mating rods on the outer wall of the ball cup corresponding to the two screws, and using the two mating rods to hinge to the two screws respectively, the overall length of the two screws can be effectively shortened, preventing them from being subjected to excessive shear force during the tightening process, which could cause the screws to bend and deform.

[0011] In the aforementioned leveling rod adjustment structure, one end of each mating rod is welded and fixed to the outer wall of the ball cup, and the other end has a hemispherical connecting sleeve. The inner end of each screw has a small ball head, and the screw and the mating rod are spherically hinged through the small ball head and the connecting sleeve. The hinged connection between the screw and the ball cup is achieved through the hinged engagement of the small ball head and the connecting sleeve. As a further preferred embodiment, the inner diameter of the connecting sleeve port should be slightly smaller than the outer diameter of the small ball head. During assembly, the connection is made by interference fit, thereby ensuring that the ball cup can be positioned within the leveling rod opening through the engagement of the two screws and the two mating rods, thus achieving stable support of the lower end of the leveling rod by the ball cup.

[0012] In the aforementioned leveling rod adjustment structure, a spherical groove is formed on the bottom surface of the upper base plate. Both the upper and lower ends of the leveling rod have large ball heads. The large ball head at the upper end of the leveling rod is hinged to the spherical groove, and the large ball head at the lower end of the leveling rod is hinged to the ball cup. This configuration allows the upper end of the leveling rod to rotate circumferentially around the hinge point with the upper base plate, using one of the large ball heads hinged to the spherical groove. The outer diameter of the large ball head at the upper end of the leveling rod is slightly larger than the inner diameter at the opening of the spherical groove. The large ball head at the upper end of the leveling rod is inserted into the spherical groove via an interference fit, ensuring relative rotation while limiting its position, thereby achieving axial positioning of the leveling rod. Furthermore, the leveling rod is hinged to the ball cup at the lower end via the large ball head, ensuring smooth rotation clockwise or counterclockwise.

[0013] In the adjustment structure of the leveling rod described above, a handwheel is fixed to the outer end of each screw. The handwheel ensures the ease of rotating the screw.

[0014] In the aforementioned leveling rod adjustment structure, a spirit level is fixed to the outer wall of the leveling rod near its center. This allows instructors and students to quickly reset the leveling rod based on the spirit level's display.

[0015] Compared with existing technologies, the adjustment structure of this leveling rod has the following advantages: the upper end of the leveling rod is hinged to the upper base plate and axially positioned, and the lower end is hinged to the ball cup, enabling the leveling rod to be adjusted circumferentially. By pushing the ball cup with two screws connected to the lower base plate, the lower end of the leveling rod can swing circumferentially around the upper hinge point, ensuring the applicability of the leveling rod in teaching use. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the adjustment structure of this leveling rod and a partial enlarged view.

[0017] Figure 2 This is a schematic diagram of the adjustment structure of this leveling rod from another perspective.

[0018] Figure 3 This is a structural diagram of the upper seat plate.

[0019] Figure 4 This is a structural schematic diagram of the lower seat plate.

[0020] Figure 5 This is a schematic diagram of the structure of a spherical bowl.

[0021] Figure 6 This is a schematic diagram of the structure of any screw.

[0022] Figure 7 This is a schematic diagram of the structure of any slider.

[0023] In the diagram, 1. Leveling rod; 11. Large ball head; 12. Level; 2. Upper base plate; 21. Spherical groove; 3. Lower base plate; 31. Through-the-meter opening; 32. Screw; 321. Small ball head; 322. Hand crank; 33. Guide hole; 331. Sliding block; 3311. Positioning part; 33111. Positioning hole; 4. Ball cup; 41. Matching rod; 411. Connecting sleeve; 5. Positioning screw. Detailed Implementation

[0024] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0025] like Figure 1-2As shown, in the adjustment structure of this leveling rod, the leveling rod 1 is vertically positioned and a horizontal rod 12 is fixed to its outer wall in the middle. The adjustment structure includes an upper base plate 2 and a lower base plate 3, which are square plates and horizontally positioned. The upper base plate 2 is located directly above the lower base plate 3. The leveling rod 1 is positioned between the upper base plate 2 and the lower base plate 3. Figure 3 A spherical groove 21 is provided at the center of the bottom surface of the upper base plate 2. Both the upper and lower ends of the leveling rod 1 are integrally formed with large ball heads 11. The outer diameter of the large ball head 11 at the upper end of the leveling rod 1 is larger than the inner diameter at the opening of the spherical groove 21. The upper end of the leveling rod 1 and the spherical groove 21 are connected by an interference fit so that the large ball head 11 at the upper end is confined in the spherical groove 21, and the hinged connection between the upper end of the leveling rod 1 and the upper base plate 2 is completed at the same time.

[0026] Combination Figure 4 and Figure 5 The lower base plate 3 has a through-hole 31 extending through its upper and lower sides. Inside the through-hole 31 is a ball bowl 4 with its rim facing upwards. The large ball head 11 at the lower end of the leveling rod 1 is hinged to the ball bowl 4. Two mating rods 41 are welded and fixed horizontally to the outer wall of the ball bowl 4. The two mating rods 41 are perpendicular to each other, and a hemispherical connecting sleeve 411 is welded and fixed to the free end of each mating rod 41. Figure 6 and Figure 7 The lower base plate 3 has elongated guide holes 33 on its adjacent outer side walls, which are connected to the through-hole 31. Each guide hole 33 is opened along the length of the corresponding side wall of the lower base plate 3, and each guide hole 33 is curved upward in an arc shape. A slider 331 is slidably connected to each guide hole 33. Each slider 331 has a threaded hole that passes through its opposite sides. Each slider 331 protrudes from the outer end of the corresponding guide hole 33. The top of each slider 331 has a plate-shaped positioning part 3311. One side of the positioning part 3311 is in contact with the outer side wall of the lower base plate 3. A through-hole is opened on the positioning part 3311. The adjustment structure includes two screws 32, which are threaded through the positioning holes 33111 on both sides of the plate. Each screw 32 is threaded into a corresponding threaded hole on one of the two sliders 331. The inner end of each screw 32 has an integrally formed small ball head 321. The two screws 32 are hinged to the connecting sleeves 411 at the free ends of the two mating rods 41 through the corresponding small ball heads 321. The outer diameter of the small ball head 321 is larger than the inner diameter of the connecting sleeve 411, allowing the small ball head 321 to be confined within the connecting sleeve 411 by an interference fit, ensuring that the two screws 32 are perpendicular to each other. Furthermore, a hand crank 322 is fixed to the outer end of each screw 32 by a nut. A positioning screw 5 is threaded into each positioning hole 33111 to abut against the outer wall of the lower base plate 3, keeping the slider 331 in position.

[0027] It should be noted that the cooperation between the slider 331 and the guide hole 33 wall can limit the sliding direction of the slider 331 and make adaptive adjustments to the position of the slider 331 (i.e., the position of the screw 32). In order to further ensure the smoothness of the slider 331 sliding, a slide rail can also be arranged in the guide hole 33 along the length direction to further improve the smoothness of the slider 331 sliding.

[0028] Operating principle: The upper base plate 2 and lower base plate 3 are both fixed horizontally to the building wall. After assembly, the leveling rod 1 is axially positioned between the upper base plate 2 and the lower base plate 3. During use, the leveling rod 1 can be manually rotated clockwise or counterclockwise, allowing it to rotate circumferentially around the hinge points at both ends. Secondly, the hand cranks 322 at the outer ends of the two screws 32 can be rotated sequentially. When one of the hand cranks 322 is rotated, the screw 32 fixed to that hand crank 322 extends inward through the threaded hole on the slider 331, thereby... A pushing force is applied to the mating rod 41, which in turn pushes the lower end of the level ruler 12 to swing around the hinge point between the upper end and the upper base plate 2. During this adjustment operation, the other screw 32 is simultaneously affected by the bias force transmitted from the lower end of the level ruler 1, so as to drive the slider 331 screwed to the screw 32 to slide one end of the guide hole 33 to avoid interference between the level ruler 1 and the mating rod 41, and at the same time ensure that the swing adjustment of the level ruler 1 can be carried out normally. After the above swing adjustment is completed, the two positioning screws 5 are tightened inward with a screwdriver so that the positioning part 3311 and the slider 331 are kept in position.

[0029] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0030] Although this document frequently uses terms such as leveling rod 1, large ball head 11, level 12, upper base plate 2, spherical groove 21, lower base plate 3, through-edge 31, screw 32, small ball head 321, hand crank 322, guide hole 33, slider 331, positioning part 3311, positioning hole 33111, ball cup 4, mating rod 41, connecting sleeve 411, and positioning screw 5, the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any additional limitation would contradict the spirit of this utility model.

Claims

1. An adjustment structure for a leveling rod, wherein the leveling rod (1) is vertically arranged, characterized in that, The adjustment structure includes a horizontally arranged upper base plate (2) and a lower base plate (3), which are vertically spaced apart. The upper end of the leveling rod (1) is hinged to the upper base plate (2) and axially positioned on the upper base plate (2). The lower base plate (3) has a rod-through opening (31) that passes through the upper and lower sides of the lower base plate (3). A ball cup (4) is provided inside the rod-through opening (31). The lower end of the leveling rod (1) is connected to the ball cup. (4) Hinged connection: Two mutually perpendicular screws (32) are connected to the side wall of the lower base plate (3) in the horizontal direction. Each screw (32) can slide along the length direction of the corresponding side wall of the lower base plate (3) and be positioned on the side wall of the lower base plate (3). The inner end of each screw (32) is hinged to the ball cup (4), and each screw (32) can extend into the through-hole (31) and push the ball cup (4) to make the leveling rod (1) swing around the hinge point with the upper base plate (2).

2. The adjustment structure of the leveling rod according to claim 1, characterized in that, The lower plate (3) is a square plate, and the adjacent two side walls of the lower plate (3) are provided with elongated guide holes (33). Each guide hole (33) is slidably connected to a slider (331), and two screws (32) are screwed to the two sliders (331) in a corresponding manner.

3. The adjustment structure of the leveling rod according to claim 2, characterized in that, Each of the guide holes (33) is curved upwards in an arc shape.

4. The adjustment structure of the leveling rod according to claim 2 or 3, characterized in that, Each slider (331) protrudes from the outer end of the guide hole (33), and each slider (331) has a plate-shaped positioning part (3311) on its top. The positioning part (3311) is in contact with the outer side wall of the lower seat plate (3). A positioning hole (33111) is provided on the plate surface of the positioning part (3311). The screw (32) is screwed to the slider (331), and a positioning screw (5) that can abut against the outer side wall of the lower seat plate (3) is screwed into the positioning hole (33111).

5. The adjustment structure of the leveling rod according to claim 1, 2, or 3, characterized in that, Two mutually perpendicular mating rods (41) are fixed on the outer wall of the ball bowl (4), and the inner ends of the two screws (32) are hinged to the two mating rods (41) in a corresponding manner.

6. The adjustment structure of the leveling rod according to claim 5, characterized in that, One end of each of the mating rods (41) is welded and fixed to the outer wall of the ball cup (4), and the other end has a hemispherical connecting sleeve (411). The inner end of each of the screws (32) has a small ball head (321). The screw (32) and the mating rod (41) are ball-jointed by the small ball head (321) and the connecting sleeve (411).

7. The adjusting structure of the leveling rod according to claim 5, characterized in that, The bottom surface of the upper base plate (2) is provided with a spherical groove (21), and the upper and lower ends of the leveling rod (1) are provided with large ball heads (11). The large ball head (11) at the upper end of the leveling rod (1) is spherically hinged to the spherical groove (21), and the large ball head (11) at the lower end of the leveling rod (1) is hinged to the ball cup (4).

8. The adjustment structure of the leveling rod according to claim 7, characterized in that, Each screw (32) has a hand crank (322) fixed to its outer end.

9. The adjustment structure of the leveling rod according to claim 8, characterized in that, A level (12) is fixed on the outer wall near the middle of the leveling rod (1).

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