drawn tower scale

Abstract

This utility model discloses a pull-out leveling rod, relating to the field of distance, leveling, or orientation measurement technology, solving the problem that existing leveling rods with bubble levels cannot simultaneously achieve both easy storage and good stability. The technical solution adopted by this utility model is: a pull-out leveling rod comprising multiple segments. The outermost segment has a slot on its side wall. With the leveling rod's centerline vertical and its lower end facing downwards, a flap is mounted on the top side wall of the slot via a rotating shaft. The rotating shaft is arranged horizontally, and a torsion spring passes through its outer side to keep the flap abutting against the side wall and maintaining its horizontal position. The flap fits into the slot, and a circular bubble is fixedly installed on the side of the flap facing away from the slot. The side wall of the slot edge also has a locking structure for fixing the flap within the slot. The pull-out leveling rod allows the operator to easily observe whether the bubble level is centered, promptly assess the leveling rod's tilt, and straighten it.

Description

Technical Field

[0001] This utility model relates to the field of distance, leveling, or orientation measurement technology, specifically a pull-out leveling rod that is easy to straighten. Background Technology

[0002] The leveling rod is a pull-out type. When used with a level instrument, the lower end of the leveling rod is placed at the measuring point, and it is usually manually held to maintain its verticality. The leveling rod is prone to tilting, and even if the person holding it corrects it promptly, it cannot be guaranteed to remain vertical. When the tilt angle is small, the person holding the rod often fails to notice the tilt, resulting in varying degrees of deviation in the readings obtained through the level instrument, affecting measurement accuracy. To keep the leveling rod vertical, a bubble level is installed on its outer side. When the bubble level is centered, the leveling rod is vertical. By observing whether the bubble level is centered, the person holding the rod can determine the tilt and correct it promptly.

[0003] For example, patent CN 211291423 U discloses a measuring ruler for engineering management, including a leveling rod with a bracket fixed to its side wall and a spirit level embedded in the top of the bracket. The bracket in this patent is L-shaped, with one side fixed to the side wall of the leveling rod, and the plane corresponding to this side parallel to the axis of the leveling rod. The spirit level is embedded in the other side of the bracket, and the plane corresponding to this side is perpendicular to the axis of the leveling rod. The leveling rod, bracket, and spirit level are relatively fixed, providing good stability for the leveling rod. However, the side of the bracket where the spirit level is embedded protrudes outwards, affecting the storage of the leveling rod. During transport, the bracket is easily bumped, causing the bracket and spirit level to tilt relative to the leveling rod, resulting in a situation where the spirit level is centered but the leveling rod is not vertical.

[0004] Patent CN 208296819 U discloses a leveling rod for urban planning alignment surveying. One end of the rod has a slot, inside which a hinged flap is mounted. A level bulb is installed in the center of the inner end of the flap. When the leveling rod tilts, the surveyor observes the level bulb to determine the tilt and its degree, allowing for timely adjustment to keep the leveling rod vertical. The level bulb is mounted on the flap; after measurement, the flap is folded back into the slot, preventing damage to the level bulb. This patent solves the problems of the flap protruding outwards, the easy damage and deformation of the flap and level bulb, and the inconvenience of storing the leveling rod by folding the level bulb and flap into the slot. However, the flap and level bulb are unstable in both their internal and external states; the flap, under its own weight, easily switches between the two states, resulting in poor stability of the level bulb. When the leveling rod is placed vertically, the flap rotates from top to bottom around its axis, causing the flap and the leveling bulb to flip out of the slot. Dust easily accumulates on the side of the flap corresponding to the slot and inside the slot, affecting the installation accuracy of the flap, which can result in the leveling bulb being centered but the leveling rod not being vertical. Utility Model Content

[0005] This invention provides a pull-out leveling rod, which solves the problem that existing leveling rods with bubble levels cannot simultaneously achieve both easy storage and good stability.

[0006] The technical solution adopted in this utility model is: a pull-out leveling rod, which includes multiple segments. The outermost segment of the leveling rod has a groove on its side wall. The center line of the leveling rod is set to be vertical and the lower end of the leveling rod is facing down. A flap is installed on the side wall of the top of the groove through a rotating shaft. The rotating shaft is arranged in a horizontal direction. A torsion spring is provided on the outside of the rotating shaft to make the flap abut against the side wall and keep it horizontal. The flap is adapted to the groove. A circular spirit level is fixedly installed on the side of the flap that is away from the groove. The side wall of the groove edge is also provided with a locking structure for fixing the flap in the groove.

[0007] The groove on the sidewall of the outermost segment of the leveling rod has a polygonal shape corresponding to the vertical cross-section of that sidewall. Furthermore, the groove is rectangular, with its top edge perpendicular to the centerline of the leveling rod, and the flap is also rectangular.

[0008] To ensure the stability and balance of the flap, two mounting rings are provided at both ends of one side of the flap. The planes corresponding to the two mounting rings are parallel to each other and perpendicular to the plane corresponding to the flap. The rotating shaft passes through the mounting rings, and a torsion spring is provided at each end of the rotating shaft.

[0009] To further reduce the risk of damage to the circular spirit level, the flap is further equipped with a circular countersunk hole, within which the circular spirit level is fixed. Even further, the center of the flap coincides with the center of the circular countersunk hole, and the outer surface of the circular spirit level is flush with the outer surface of the flap.

[0010] To facilitate the installation of the rotating shaft, the rotating shaft is further provided with two mounting holes on the side wall of the outermost segment of the tower gauge. The two mounting holes are located at the top of the slot. The rotating shaft passes through the two mounting holes and is fixed to the side wall of the outermost segment of the tower gauge with nuts.

[0011] To facilitate the contact and relative fixation between the flap and the leveling rod, the outermost segment of the leveling rod is further provided with a positioning block that contacts the flap. The positioning block is fixed to the side wall of the outermost segment of the leveling rod, or the positioning block is threaded to the side wall of the outermost segment of the leveling rod.

[0012] To facilitate the installation of the locking structure and reduce the force required to fix the flap in the slot, the locking structure is further located at the bottom of the slot.

[0013] The locking structure is used to fix the flap in the slot. When the locking structure is released, the flap automatically flips out of the slot under the action of a torsion spring. Specifically: the locking structure includes a pin seat fixedly installed on the side wall of the outermost segment of the leveling rod, and an L-shaped pin installed on the pin seat; or, the locking structure includes a spring groove fixedly installed on the inner side of the side wall of the outermost segment of the leveling rod, the spring groove being arranged along the centerline of the leveling rod and located below the slot. The side wall of the outermost segment of the leveling rod also has a strip-shaped hole communicating with the spring groove, the strip-shaped hole also being arranged along the centerline of the leveling rod. A spring is installed in the spring groove, and an actuating plate and a spring tongue are sequentially connected to the upper end of the spring. Part of the actuating plate is located in the spring groove, and part is located in the strip-shaped hole. The spring tongue is located in the slot under the pushing action of the spring.

[0014] The beneficial effects of this utility model are as follows: The pivot of the flip plate is located at the top of the slot. When the flip plate with the circular level bubble installed flips out of the slot, it flips from bottom to top, preventing dust accumulation on the flip plate from entering the slot. This also prevents dust accumulation at the top of the slot, avoiding inaccurate relative positions between the flip plate and the outermost segment of the leveling rod if foreign objects such as dust enter the top of the slot. After the flip plate flips out of the slot, the torsion spring maintains a stable positional relationship between the flip plate and the leveling rod, ensuring the leveling rod remains vertical when the level bubble is centered. When the flip plate is pressed into the slot and fixed in place by the locking structure, the flip plate will not automatically flip out of the slot, and the flip plate and level bubble will no longer protrude outwards, or will not protrude significantly outwards, facilitating the storage and transport of the leveling rod. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of one embodiment of the pull-out leveling rod of this utility model.

[0016] Figure 2 yes Figure 1 A magnified view of a portion of region A.

[0017] Figure 3 yes Figure 2 A schematic diagram of a flap with a circular level installed in the middle.

[0018] Figure 4 yes Figure 2 A schematic diagram of the structure after the flap is removed.

[0019] Figure 5 yes Figure 2 A schematic diagram of the locking structure.

[0020] Reference numerals in the attached drawings: side wall 1, strip hole 1-1, rotating shaft 2, flap 3, mounting ring 3-1, torsion spring 4, circular spirit level 5, positioning block 6, spring groove 7-1, spring 7-2, actuating plate 7-3, spring tongue 7-4. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings.

[0022] like Figure 1 As shown, this utility model is a pull-out leveling rod, which includes multiple segments. The outermost segment of the leveling rod has a slot on its side wall 1 for installing a flip plate 3. Each segment of the leveling rod has a polygonal cross-section, generally rectangular, such as... Figure 1 As shown. For ease of description, this utility model sets the center line of the leveling rod to be vertical and the lower end of the leveling rod to face downwards, that is, the end of the leveling rod used to place at the measurement point faces downwards. A flap 3 is installed on the top of the slot via a rotating shaft 2. The rotating shaft 2 is installed on the side wall 1, and the installation position of the rotating shaft 2 is at the top of the slot. The rotating shaft 2 is arranged in a horizontal direction, that is, the axis of the rotating shaft 2 is horizontal and perpendicular to the center line of the leveling rod.

[0023] The rotating shaft 2 can be fixedly installed on the side wall 1, in which case the rotating shaft 2 is fixed relative to the side wall 1; the rotating shaft 2 can also be rotatably installed on the side wall 1, in which case the rotating shaft 2 can rotate around its axis. In order to improve the stability of the rotating shaft 2 and the flip plate 3, the rotating shaft 2 is preferably fixedly installed on the side wall 1. For example, the rotating shaft 2 is a bolt, and the side wall 1 of the outermost segment of the tower gauge is provided with two mounting holes. The two mounting holes are located at the top of the slot. The rotating shaft 2 passes through the two mounting holes and is fixedly installed on the side wall 1 of the outermost segment of the tower gauge by nuts.

[0024] Flip plate 3 is mounted on rotating shaft 2, and flip plate 3 can rotate around rotating shaft 2. See, for example. Figure 3 The flap 3 is a rectangular plate. Two mounting rings 3-1 are provided at both ends of one side of the flap 3. The planes corresponding to the two mounting rings 3-1 are parallel to each other and perpendicular to the plane corresponding to the flap 3. The diameter of the hole in the mounting ring 3-1 is adapted to the outer diameter of the rotating shaft 2, and the rotating shaft 2 passes through the mounting ring 3-1. The flap 3 is adapted to the slot, that is, the shape and size of the flap 3 are consistent with the shape and size of the slot. The flap 3 can be flipped into or out of the slot. The vertical cross-section of the slot corresponding to its side wall 1 is polygonal, and the top edge of the slot is a straight edge to facilitate the arrangement of the rotating shaft 2. To simplify the structure of the slot, such as... Figure 2 and Figure 4 As shown, the slot is generally a rectangular slot, with its two long sides horizontal and its two wide sides vertical. The top edge of the rectangular slot is perpendicular to the center line of the leveling rod. Correspondingly, the flip plate 3 is also rectangular.

[0025] A torsion spring 4, consisting of one or more springs, is inserted through the outer side of the rotating shaft 2 to keep the flap 3 abutting against the side wall 1 and maintaining its horizontal position. One end of the torsion spring 4 engages with the side wall 1, and the other end engages with the flap 3. The torsion spring 4 uses its own torque to rotate the flap 3 out of the slot, abutting against the side wall 1 and maintaining its horizontal position. See, for example. Figure 4A torsion spring 4 is installed at each end of the rotating shaft 2.

[0026] A circular spirit level 5 is fixedly installed on the side of the flip plate 3 facing away from the slot. After the flip plate 3 flips out of the slot, the torsion spring 4 can maintain a stable positional relationship between the flip plate 3 and the leveling rod, ensuring that the leveling rod remains vertical when the spirit level is centered. The flip plate 3 serves to install, flip, and protect the circular spirit level 5. To reduce the risk of damage to the circular spirit level 5, the flip plate 3 has a circular countersunk hole, in which the circular spirit level 5 is fixed. To further reduce the overall thickness of the flip plate 3 and the circular spirit level 5, and to better protect the circular spirit level 5, the center of the flip plate 3 coincides with the center of the circular countersunk hole, and the outer surface of the circular spirit level 5 is flush with the outer surface of the flip plate 3.

[0027] After the flap 3 flips out of the slot, it can directly abut against the side wall 1 with the slot, or indirectly abut against it. For example, the side wall 1 of the outermost segment of the leveling rod is also provided with a positioning block 6 that abuts against the flap 3. The positioning block 6 can be fixedly installed on the side wall 1 of the outermost segment of the leveling rod, for example, by welding the positioning block 6 to the side wall 1 with the slot. In addition, the positioning block 6 can also be threaded to the side wall 1 of the outermost segment of the leveling rod. Considering that the rotating shaft 2 and the flap 3 of the leveling rod will inevitably deform over time, in order to calibrate the circular level 5, the position of the positioning block 6 can be adjusted so that the level 5 is centered when the center line of the leveling rod is vertical. After calibration, the position of the positioning block 6 can be fixed.

[0028] The side wall 1 of the slot edge is also provided with a locking structure for fixing the flap 3 into the slot. The locking structure is used to fix the flap 3 into the slot, preventing the flap 3 and the circular spirit level 5 from flipping out of the slot. When the locking structure is released, the flap 3 automatically flips out of the slot under the action of the torsion spring 4. The locking structure can be set at any position around the slot. To facilitate the arrangement of the locking structure and reduce the force required to fix the flap 3 into the slot, the locking structure is preferably set at the bottom of the slot, such as... Figure 1 , 2 As shown in Figure 4.

[0029] Two embodiments of the locking structure are provided below. The first embodiment of the locking structure includes a pin seat fixedly installed on the outer wall of the side wall 1 of the outermost segment of the tower gauge, and an L-shaped pin installed on the pin seat. The front end of the L-shaped pin is inserted into the slot to lock the flap 3. When the front end of the L-shaped pin retracts from the slot, the locking of the L-shaped pin flap 3 is released.

[0030] A second implementation of the locking structure is as follows: Figure 5As shown. The locking structure includes a spring groove 7-1 fixedly installed on the inner side of the side wall 1 of the outermost segment of the leveling rod. A spring 7-2 is provided in the spring groove 7-1. The lower end of the spring 7-2 is placed directly in the spring groove 7-1, that is, the two are not fixed, or the lower end of the spring 7-2 is fixed to the spring groove 7-1.

[0031] The spring groove 7-1 is arranged along the centerline of the leveling rod and located below the slot. The side wall 1 of the outermost segment of the leveling rod is also provided with a strip hole 1-1 communicating with the spring groove 7-1. The strip hole 1-1 is also arranged along the centerline of the leveling rod. The upper end of the spring 7-2 is connected to a toggle plate 7-3 and a spring tongue 7-4 in sequence. Part of the toggle plate 7-3 is located in the spring groove 7-1 and part is located in the strip hole 1-1. The spring tongue 7-4 is located in the slot under the pushing action of the spring 7-2. At this time, the toggle plate 7-3 is located at the upper end of the strip hole 1-1, and the spring tongue 7-4 can lock the flip plate 3. By pressing the toggle plate 7-3 downward with a finger, the spring 7-2 is compressed and contracted, and the spring tongue 7-4 retracts to the spring groove 7-1, releasing the lock of the spring tongue 7-4 on the flip plate 3. In order for the locking structure to automatically lock the flip plate 3, the outward side of the spring tongue 7-4 is provided with a slope, such as Figure 5 As shown.

Claims

1. A draw tower, the tower comprising a plurality of segments, the side wall (1) of the outermost segment of the tower being provided with a clamping slot, characterised in that: With the center line of the leveling rod vertical and the lower end of the leveling rod facing down, a flap (3) is installed on the side wall (1) at the top of the slot via a pivot (2). The pivot (2) is arranged in a horizontal direction, and a torsion spring (4) is provided on the outside of the pivot (2) to make the flap (3) abut against the side wall (1) and keep it horizontal. The flap (3) is adapted to the slot, and a circular spirit level (5) is fixedly installed on the side of the flap (3) facing away from the slot. The side wall (1) at the edge of the slot is also provided with a locking structure for fixing the flap (3) in the slot.

2. The pull-out telemeter as described in claim 1, characterized in that: The slot is a rectangular slot, and the top edge of the rectangular slot is perpendicular to the center line of the scale. The flip plate (3) is also rectangular.

3. The pull-out telemeter as described in claim 2, characterized in that: Two mounting rings (3-1) are provided at both ends of one side of the flap (3). The planes corresponding to the two mounting rings (3-1) are parallel to each other and perpendicular to the plane corresponding to the flap (3). The rotating shaft (2) passes through the mounting ring (3-1). A torsion spring (4) is provided at each end of the rotating shaft (2).

4. The pull-out telemeter as described in claim 1, characterized in that: The flap (3) is provided with a circular countersunk hole, and the circular spirit level (5) is fixed inside the circular countersunk hole.

5. The pull-out telemeter as described in claim 4, characterized in that: The center of the flap (3) coincides with the center of the circular countersunk hole, and the outer surface of the circular spirit level (5) is flush with the outer surface of the flap (3).

6. The pull-out telemeter as described in claim 1, characterized in that: The rotating shaft (2) is a bolt. The side wall (1) of the outermost segment of the tower gauge has two mounting holes. The two mounting holes are located at the top of the slot. The rotating shaft (2) passes through the two mounting holes and is fixed to the side wall (1) of the outermost segment of the tower gauge by a nut.

7. The pull-out telemeter as described in claim 1, characterized in that: The outermost segment of the tower gauge is also provided with a positioning block (6) that abuts against the flap (3). The positioning block (6) is fixed to the side wall (1) of the outermost segment of the tower gauge, or the positioning block (6) is threaded to the side wall (1) of the outermost segment of the tower gauge.

8. The pull-out telemeter as described in any one of claims 1 to 7, characterized in that: The locking mechanism is located at the bottom of the card slot.

9. The pull-out telemeter as described in claim 7, characterized in that: The locking structure includes a pin seat fixedly installed on the side wall (1) of the outermost segment of the tower gauge, and an L-shaped pin installed on the pin seat; or, the locking structure includes a spring groove (7-1) fixedly installed on the inner side of the side wall (1) of the outermost segment of the tower gauge, the spring groove (7-1) is arranged along the center line of the tower gauge and located below the slot, the side wall (1) of the outermost segment of the tower gauge is also provided with a strip hole (1-1) communicating with the spring groove (7-1), the strip hole (1-1) is also arranged along the center line of the tower gauge, a spring (7-2) is provided in the spring groove (7-1), the upper end of the spring (7-2) is connected to a toggle plate (7-3) and a spring tongue (7-4) in sequence, and part of the toggle plate (7-3) is located in the spring groove (7-1) and part of it is located in the strip hole (1-1), the spring tongue (7-4) is located in the slot under the pushing action of the spring (7-2).

Images