Wearable mini two-line gradienter capable of achieving positive and negative 90-degree automatic leveling

Abstract

The invention relates to a wearable two-line gradienter capable of automatically leveling at positive and negative 90 degrees, and belongs to the technical field of laser correction. The counter weight, the battery, the electric wire, the self-leveling laser transmitter and the power supply controller are combined to form an integral pendulum structure, the pendulum structure is movably connected with the inner frame through the front and rear bearings, and the inner frame is movably connected with the outer frame through the left and right bearings. No frame is arranged in front of and above the outer frame, and front-back space of the outer frame is released. The design solves the problem that the pendulum of the existing gradienter is connected with an external wire, the precision of the gradienter is improved, the size is reduced, free swinging of the pendulum is realized, and the gradienter is suitable for being used in various scenes. In addition, only a plus or minus 90-degree swinging area of the pendulum is reserved, redundant space is removed, other parts are installed in a gap area between the pendulum and the inner frame, the size and weight of the pendulum are greatly reduced, the pendulum can be placed in a pocket of clothes, and portability of the pendulum is improved. And finally, remote control equipment is additionally arranged, so that the problem of inconvenience in operation during wearing and use is solved.

Description

Technical Field

[0001] The invention relates to the technical field of laser correction of measuring instruments, and is a wearable mini two-line level capable of automatically leveling within a range of plus or minus 90 degrees. Technical Background

[0002] In the process of construction, it is often necessary to rely on tools to obtain horizontal or vertical lines, and a laser level is an electronic instrument that can project horizontal and vertical laser beams relatively accurately on a spatial plane. It can assist construction workers in quickly and accurately determining vertical or horizontal lines, providing convenience for subsequent construction. However, the automatic leveling level in the existing technology is limited in its leveling range due to reasons such as the external circuit of the laser transmitter, and can usually only be leveled within a range of plus or minus 5 degrees of the slope. Automatic control is required to adjust the level itself to a horizontal position in order to work properly. Although this design has achieved automatic leveling to a certain extent, it is expensive and bulky, making it inconvenient to carry around, and it cannot move up and down or left and right in sync with the construction workers, and its flexibility is obviously insufficient.

[0003] Although patents such as Chinese patent publication number CN219624780U disclose an automatic laser level calibrator, which to some extent solves the problem of timely automatic leveling during laser level measurements and reduces its size, some problems still exist in practical applications. For example, connecting the self-leveling laser transmitter with unlimited swing to the external circuit remains a challenge. Most of them use a magnetic base for adjustment, which affects the accuracy of the calibration and limits the swing amplitude of the laser transmitter to a certain slope range, limiting its use on steeply sloped surfaces or sports equipment.

[0004] Therefore, existing laser levels still need improvement in terms of automatic leveling, size, weight, and ease of use. To better meet construction needs and improve work efficiency, it is necessary to develop a new type of laser level that can automatically level over a wider range of slopes while maintaining a compact size, light weight, and convenient operation. Through continuous technological innovation and optimization, we believe that more efficient and practical laser levels will be introduced in the future, providing better services for industries such as construction. Summary of the Invention

[0005] The present invention aims to provide a wearable mini two-line level capable of automatic leveling within a ±90-degree range. This solution addresses the existing lack of a level that combines automatic leveling with a compact, lightweight, high-precision, and low-cost design. Through a series of unique design and optimization techniques, the level's accuracy is improved, its size and weight are reduced, and remote control functionality is implemented, making it more accurate, lighter, and easier to use. It can also move synchronously with the wearer, both up and down, and left and right, ensuring proper operation. This makes it suitable for a wider range of applications and affordable.

[0006] The main design features of the present invention are as follows: 1. Metal counterweight and primary battery integrated design: The integrated primary battery replaces the weight and space originally occupied by the metal counterweight, freeing up the space and weight previously occupied by the primary battery. This design reduces the overall weight and volume of the level.

[0007] 2. Integrated Pendulum Structure Design: The metal counterweight is then integrated with the self-leveling laser emitter, power controller, and its circuitry, forming a fully integrated pendulum structure that is both moving and relatively stationary. This design effectively solves the circuit constraints of existing levels, enabling the pendulum to achieve unrestricted 360-degree swing, eliminating the swing amplitude limitations of traditional designs and improving calibration accuracy. The pendulum structure also features a fixed counterweight adjuster and remote control components.

[0008] 3. Pendulum-like Swinging Design: The metal counterweight features circular holes on the front and back of the top, each with the same diameter as the self-leveling laser emitter and power controller. These holes allow the laser emitter and power controller to be conveniently nested and securely connected. This design allows the pendulum structure to serve as both the counterweight and the swing axis, significantly shortening the swing wheelbase and increasing the relative weight of the counterweight, effectively improving both the speed and stability of the swing. Furthermore, the metal counterweight, nested outside the self-leveling emitter, effectively provides heat dissipation for the laser. This eliminates the existing heat sink in the level, further reducing the level's size.

[0009] 4. Inner and Outer Frame Design, i.e., Level Calibration Method: This invention utilizes a separate inner and outer frame design, with the first and second bearings located in the inner and outer frames, respectively, enabling flexible connection. The pendulum structure can swing freely 360 degrees left and right within the inner frame, achieving vertical correction of the level without amplitude restrictions. The outer frame, on the other hand, allows for unrestricted 360-degree front-to-back swinging, achieving horizontal correction of the level without amplitude restrictions. This design frees up space in the outer frame, further reducing the size of the level.

[0010] 6. Optimization of inner and outer frames: The inner frame is equipped with a counterweight adjuster to adjust the inner frame's swing and reset. A fixed lock is installed between the inner and outer frames to keep the inner and outer frames relatively still when the level is not in use. For this invention, the bottom of the outer frame and the bottom of the inner frame are curved to reduce the space occupied by the inner frame when it swings, further reducing the size and weight of the level. 5. Optimized Volume: This invention retains only the 90-degree swinging area within the inner frame of the level, eliminating any excess space. The fixed laser transmitter, secondary battery, and other components are optimally mounted within the gap between the pendulum and the inner frame. This significantly reduces the size and weight of the level and improves its portability, allowing it to fit directly into a pocket for easy wear.

[0011] 7. Telescopic Legs, Remote Control, and Counterweight Adjuster: To enhance the stability of the spirit level during back-and-forth swinging, the present invention incorporates telescopic legs at the bottom of the outer frame. Furthermore, the addition of a remote control alleviates the inconvenience of wearing and using the spirit level. The counterweight adjuster facilitates calibration of the spirit level's absolute level during reset, increasing speed in mass production. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0013] Figure 1 A front cross-sectional schematic diagram of a wearable mini two-line level capable of automatically leveling at plus or minus 90 degrees provided by the present invention; Figure 2 A schematic diagram of the back section of a wearable mini two-line level that can automatically adjust to plus or minus 90 degrees, provided by the present invention; Figure 3 A schematic diagram of the left side cross section of a wearable mini two-line level that can automatically adjust to plus or minus 90 degrees provided by the present invention; Figure 4 A schematic cross-sectional view of the right side of a wearable mini two-line level capable of automatically leveling at plus or minus 90 degrees provided by the present invention; Figure 5 A schematic diagram of the right front appearance of a wearable mini two-line level that can automatically level by 90 degrees provided by the present invention.

[0014] Figure 6 This is a schematic diagram of the left rear appearance of a wearable mini two-line level that can automatically level within ±90 degrees provided by the present invention. Markings in the figure: 101, metal counterweight; 102, first battery; 103, first bearing; 104, self-leveling laser transmitter; 105, remote control device assembly; 106, counterweight regulator; 107, power switch; 108, charging port; 109, power controller; 110, reserved gap; 111, schematic diagram of circuit direction; 201, fixed laser transmitter; 202, second battery; 301, inner frame; 302, schematic line of pendulum swing trajectory; 401, outer frame; 402, telescopic foot; 501, second bearing. V. Specific implementation methods: 1. The present invention aims to provide a wearable mini two-line level that can automatically adjust to a level of plus or minus 90 degrees, so as to solve the problems existing in the prior art. The present invention is characterized in that it comprises a metal counterweight (101), a first battery (102), a self-leveling laser transmitter (104), a power controller (109), a remote control device component (105), a counterweight regulator (106), an inner frame (301) and an outer frame (401), wherein the metal counterweight (101) is combined with the first battery (102), and after the combination, the metal counterweight (101) is fixedly connected to the self-leveling laser transmitter (104) and the power controller (109) including the controller circuit to form an integral pendulum structure. The pendulum structure is rotatably connected to the inner frame (301) via the front and rear first bearings (103), and the inner frame (301) is rotatably connected to the outer frame (401) via the left and right second bearings (501), thereby enabling the level to swing left and right in the inner frame (301) to achieve a vertical direction correction function, and the inner frame (301) to swing back and forth in the outer frame (401) to achieve a horizontal direction correction function.

[0015] 2. Metal counterweight integrated design: The present invention integrates the metal counterweight (101) and the first battery (102). The first battery (102) is fixed inside the metal counterweight (101) and can be installed, removed, or fixed. The integrated first battery (102) replaces the weight of the original metal counterweight. Freeing up the first battery saves the space and weight originally required for placement, thereby reducing the overall weight and volume of the level.

[0016] 3. Overall pendulum structure design: After the metal counterweight (101) is combined, the front and rear tops of the metal counterweight (101) are reserved with circular holes of the same diameter as the self-leveling laser emitter (104) and the power controller (109). The front and rear holes are respectively nested on the outside of the rear end of the self-leveling laser emitter (104) and the front end of the power controller (109) and fixedly connected. A gap (110) is reserved between the self-leveling laser emitter (104) and the power controller (109). The controller circuit of the power controller is connected to the self-leveling laser emitter (104), the first battery (102) and the remote control device component (105) through the reserved gap (110) and fixed on the metal counterweight (101) to form a complete circuit. All the above components constitute a pendulum structure that moves relative to the rest of the whole. This design effectively solves the problem of circuit entanglement in the existing level instrument, allowing the pendulum to achieve 360-degree unlimited swing, getting rid of the limitation of the swing amplitude in the traditional design, and improving the accuracy of correction. The pendulum structure can be optimized to be fixedly installed with a remote control device component (105) and a counterweight regulator (106), etc., to increase the functions of remote control and level reset correction adjustment.

[0017] 4. Optimized design of inner frame and pendulum: A circular hole is opened at the front and rear of the inner frame (301), and the front and rear circular holes are respectively embedded in the front and rear first bearings (103) and rotatably connected. The top of the pendulum structure is embedded in the front and rear first bearings (103) and rotatably connected to achieve left and right swinging in the inner frame (301), completing the vertical direction correction function. This design abandons the rough design of the existing technology of connecting the metal counterweight with the swing shaft, forming a fusion of the counterweight, the swing shaft, and the swing shaft, the counterweight. The advantage is that the swing wheelbase is greatly shortened, the relative weight of the counterweight is increased, and the swing return speed and swing stability are effectively improved. At the same time, the metal counterweight is embedded outside the self-leveling light emitter, and also effectively provides a heat dissipation function for the laser. The existing level radiator is eliminated, and the volume is further reduced. The specific positions where the top of the pendulum structure is embedded in the front and rear first bearings (103) are the laser head part of the front self-leveling laser emitter (104) and the rear end of the power controller (109) at the top of the pendulum structure.

[0018] 5. The rear end of the power controller (109) is nested in the first bearing (103) at the rear of the inner frame. The power controller (109) always maintains a rotatable state according to the gravity principle of the pendulum structure. The power controller (109) includes: a controller circuit, a power switch (107) and a charging port (108). The power controller (109) is connected to the remote control device component, the first battery and the self-leveling laser transmitter through the controller circuit at the front end. The power switch (107) and the charging port (108) are installed in the rear end. This design ensures that the relative inner frame (301) cannot ensure that the static self-leveling laser transmitter (104) and the first battery (102) are connected to the external power supply and external control is smooth.

[0019] 6. Design of inner and outer frames and level calibration method: The present invention also improves the design of the level's rotation connection. In conventional level designs, the front, back, left, and right swing rotation connections are usually located within a single frame shell, whereas the present invention designs them separately within the inner frame (301) and the outer frame (401). Specifically, the pendulum structure is rotationally connected to the inner frame (301) via the front and back first bearings (103). The swing structure achieves 360-degree unrestricted left and right swinging in the inner frame (301) via the first bearings (103), thereby achieving the level's vertical direction correction function without amplitude limitation. The outer frame (401) is designed to be frameless in the front, back, and top, thereby freeing up the swing space of the inner frame (401). Circular holes are opened on the left and right sides of the outer frame, which are rotationally connected to the left and right second bearings (501). The inner frame (301) is rotationally connected to the outer frame (401) via the left and right second bearings (501). The outer frame (401) achieves 360-degree unrestricted left and right swinging in the outer frame (401) via the second bearings (501), thereby achieving the horizontal direction correction function without amplitude limitation. The swing space of the inner frame (401) is released, and the volume of the level is further reduced.

[0020] 7. The laser head of the self-leveling laser emitter (104) is nested in the first bearing (103) at the front of the inner frame. The laser head emits a cross laser beam that always remains horizontal and vertical on the object being measured according to the gravity principle of the pendulum structure, providing guidance, correction, and measurement in a timely manner. The optimized laser head is not limited to emitting a cross beam, but can also emit a straight beam or a Mi beam.

[0021] 8. The laser beams of the self-leveling laser emitter (104) and the fixed laser emitter (201) can be optimized into two colors for easy identification after projection. The crosshairs of one set of cross laser beams are scaled with numbers indicating angles. In this way, if the level body is not level, the tilt angle of the body can be determined based on the scale lines where the two sets of different laser projections intersect. The present invention can measure the tilt angle of the contact surface of the level. For example, it can measure the tilt of a ship's hull.

[0022] 9. Optimization of inner and outer frames: The inner frame (301) is equipped with a counterweight regulator for adjusting the reset and correction of the inner frame (301) level. A fixed lock is installed between the inner frame (301) and the outer frame (401) for keeping the inner frame (301) and the outer frame (401) relatively still when the level is not in use, thereby extending the service life of the level. In order to reduce the arc-shaped area formed at the bottom of the inner frame when it swings, the present invention makes an arc-shaped treatment on the bottom of the outer frame (401) and the bottom of the inner frame (301), thereby reducing the space occupied by the inner frame when it swings, and further reducing the volume and weight of the level.

[0023] 10. Volume Optimization Design: The present invention retains only the swing structure within the positive and negative 90-degree swing area within the inner frame (301) of the level, eliminating redundant areas. Furthermore, the fixed laser emitter (201) and its second power supply battery (202) and other components are optimally installed outside the pendulum swing track (302) and in the vacant area of ​​the inner frame (301). This significantly reduces the volume and weight of the level. This allows the level to be placed directly in a pocket, making it lighter to wear and greatly improving its portability.

[0024] 11. In addition, the present invention also designs a retractable foot (402) at the bottom of the outer frame (401) to increase the stability of the spirit level when it swings back and forth. Further, an external fixed mounting piece is designed at the bottom of the outer frame, for example, the spirit level can be mounted on a helmet or dropped on the top; at the same time, the addition of a remote control device solves the problem of inconvenience in operation during wearing and use, thereby improving the convenience of use. The design of the counterweight adjuster also facilitates the calibration of the absolute level of the spirit level when it is reset during production, thereby improving the speed of mass production. It should be noted that the scope of protection of the present invention is not limited to the above-mentioned specific embodiments. Any equivalent replacement or change made within the technical scope of the present invention should be deemed to be included in the scope of protection of the present invention. For example, the specific combination of the metal counterweight (101) and the battery, the optimized design of the pendulum structure, the specific implementation of the connection between the inner and outer frame bearings, other implementations of the counterweight regulator, and the retention of different amplitude swing zones can all be appropriately adjusted according to actual needs.

[0025] In summary, the present invention solves the problems of the existing spirit levels such as bulkiness, leveling, and inconvenience in wearing through unique design and optimization, improves the accuracy of the spirit level, reduces its size and weight, and realizes the remote control function, making the spirit level more accurate, lighter, and easier to use, and can move up and down, left and right in sync with the wearer and work normally, suitable for more application scenarios and low price. The specific implementation method of the present invention is only a preferred embodiment of the present invention, but the technical features of the present invention are not limited to this. Any modification, equivalent replacement or improvement of the present invention should be included in the scope of protection of the present invention. Through a series of unique designs and optimizations, Application Cases: A wearable mini two-line level that automatically adjusts to ±90 degrees has broad practical value and market prospects, revolutionizing measurement. Here are some practical use cases.

[0026] 1. Construction site application: On construction sites, spirit levels are crucial tools for measuring and ensuring the levelness of various structures and equipment. Traditional spirit levels can be limited when operating on uneven surfaces or complex building structures. However, the spirit level of this invention can automatically adjust itself, ensuring accurate measurements regardless of the unevenness of the surface. For example, when constructing scaffolding or installing steel structures, a spirit level can be used to ensure the horizontal position of each component, ensuring the stability and safety of the structure. A handheld spirit level allows for timely inspection of project levels. It can also replace traditional leveling tools and levels when bricklayers are laying bricks.

[0027] 2. Shipbuilding and repair: During shipbuilding and maintenance, it's crucial to ensure the levelness of the hull, deck, and various equipment. This is especially true on large vessels, where the curvature of the hull and the tilt of various areas can make accurate measurements difficult with traditional spirit levels. The present invention's spirit level, with its automatic leveling function, can easily handle these complex environments, ensuring precise measurements.

[0028] 3. Artwork and furniture installation: During the installation of artworks and furniture, it is often necessary to ensure that they are level with the ground or wall. For example, when hanging a picture or installing a fireplace, workers wearing the level of the present invention on their hard hats can provide timely guidance to ensure that they are parallel to the ground or wall.

[0029] 5.Agriculture and Land Surveying: In agriculture and land surveying, spirit levels are commonly used to measure the flatness and slope of land. The spirit level of this invention can quickly adapt to various terrains, helping farmers and land surveyors accurately assess land conditions and providing strong support for planting and planning.

[0030] These are just some application cases of the level instrument of the present invention. In fact, due to its high precision, high stability and wide applicability, it can also play an important role in more fields.

Claims

1. A wearable mini two-line level that can automatically level by 90 degrees, characterized by: The invention comprises a metal counterweight (101), a first battery (102), a first bearing (103), a self-leveling laser emitter (104), a power controller (109), a remote control device assembly (105), a counterweight regulator (106), an inner frame (301) and an outer frame (401), wherein the metal counterweight (101) is combined with the first battery (102) and then combined with the self-leveling laser emitter (104) and the power controller (109) to form an integral pendulum structure; the pendulum structure is rotatably connected to the inner frame (301) through the front and rear first bearings (103), and swings left and right in the inner frame (301) to achieve vertical direction correction of the level; the inner frame (301) is then rotatably connected to the outer frame (401) through the left and right second bearings (501), and swings back and forth in the outer frame (401) to achieve horizontal direction correction of the level. In order to reduce the volume of the level, the inner frame (301) only retains a certain amplitude swing area of ​​the pendulum structure and removes excess space; the fixed laser emitter (201) and its second power supply battery (202) and other components are optimally installed in the idle area of ​​the pendulum and the inner frame (301) to reduce the volume and weight of the level.

2. A wearable mini two-line level capable of automatically leveling at plus or minus 90 degrees according to claim 1, characterized in that: The metal counterweight (101) and the first battery (102) are integrated into one body, and this design aims to reduce the volume and weight of the level.

3. A wearable mini two-line level capable of automatically leveling at plus or minus 90 degrees according to claim 1, characterized in that: The pendulum structure comprises a metal counterweight (101), a first battery (102), a self-leveling laser emitter (104) and a power controller (109), etc. The integral pendulum structure avoids the problem of circuit entanglement.

4. A wearable mini two-line level capable of automatically leveling at plus or minus 90 degrees according to claims 1 and 3, characterized in that: The power controller (109) includes a controller circuit, a power switch (107), a charging port (108), etc.

5. A wearable mini two-line level capable of automatically leveling at plus or minus 90 degrees according to claims 1, 3 and 4, characterized in that: The power controller (109) is connected to the first battery (102), the self-leveling laser transmitter (104), the remote control device component (105), etc. through the controller circuit at the front end, and a power switch (107) and a charging port (108) are installed at the rear end. This design ensures that the relative inner frame (301) cannot ensure that the static self-leveling laser transmitter (104) and the first battery (102) are connected to the external power supply and external control is smooth.

6. A wearable mini two-line level that can automatically level by 90 degrees according to claims 1 and 3, characterized in that After the pendulum structure is optimized, it also includes components such as a remote control device assembly (105) and a counterweight regulator (106), thereby optimizing the pendulum structure for more functions and realizing remote control and level reset correction adjustment.

7. A wearable mini two-line level capable of automatically leveling at plus or minus 90 degrees according to claims 1 and 3, characterized in that: The front and rear ends of the top of the pendulum structure are rotatably connected to the front and rear first bearings (103), so that the pendulum structure forms a fusion of a counterweight, i.e., a swing axis, and a swing axis, i.e., a counterweight. The advantages are that the swing wheelbase is greatly shortened, the relative weight of the counterweight is increased, and the swing return speed and the swing stability are effectively improved.

8. A wearable mini two-line level capable of automatically leveling at plus or minus 90 degrees according to claims 1 and 3, characterized in that: The front and rear ends of the top of the pendulum structure are respectively the laser head part of the self-leveling laser emitter (104) and the rear end part of the power controller (109).

9. The wearable mini two-line level capable of automatically leveling at plus or minus 90 degrees according to claim 1, characterized in that: The inner frame (301) is provided with circular holes at the front and rear, and a first bearing (103) is nested in the circular holes. The pendulum structure is rotatably connected to the first bearing (103), so that the pendulum structure can swing infinitely 360 degrees in the left and right directions within the inner frame (301), thereby realizing vertical correction of the level without amplitude limitation.

10. A wearable mini two-line level capable of automatically leveling at plus or minus 90 degrees according to claim 1, characterized in that: The inner frame (301) is rotatably connected to the outer frame (401) via the left and right second bearings (501), and the inner frame (301) swings back and forth in the outer frame (401) to achieve horizontal direction correction of the level.

11. A wearable mini two-line level capable of automatically leveling at plus or minus 90 degrees according to claim 10, characterized in that: The outer frame (401) has no frame in front, back, or above, freeing up swing space, allowing the inner frame to swing 360 degrees without restriction in the outer frame, thus achieving horizontal correction of the level without amplitude restriction.

12. A wearable mini two-line level capable of automatically leveling at plus or minus 90 degrees according to claim 8, characterized in that: The laser head of the self-leveling laser emitter (104) is nested in the first bearing (103) at the front of the inner frame. The laser head can emit a cross laser beam that always remains horizontal and vertical to the object being measured according to the gravity principle of the pendulum structure, providing guidance, correction and measurement in a timely manner. The optimized laser head is not limited to emitting a cross beam, but can also emit a straight beam or a cross beam.

13. A wearable mini two-line level capable of automatically leveling at plus or minus 90 degrees according to claim 1, characterized in that: The laser beams of the self-leveling laser emitter (104) and the fixed laser emitter (201) can be optimized into two colors for easy identification, and the cross lines emitted by one set of cross laser beams are scaled, with the numbers marked as angles. The present invention can measure the tilt angle of the contact surface of the level instrument.

14. A wearable mini two-line level capable of automatically leveling within ±90 degrees according to claims 10 and 11, characterized in that: The bottom of the outer frame (401) and the bottom of the inner frame (301) are arc-shaped, so that the inner frame takes up less space when the outer frame swings back and forth.

15. A wearable mini two-line level capable of automatically leveling at plus or minus 90 degrees according to claims 1, 10 and 11, characterized in that: The bottom of the outer frame (401) is designed with telescopic feet (402) to increase the stability of the level when it swings back and forth; further optimizing the design, an external fixed mounting piece is designed at the bottom of the outer frame.

16. The wearable mini two-line level according to any one of claims 1, 3 and 8, characterized in that: The metal counterweight (101) is nested outside the self-leveling laser emitter (104) and also serves to dissipate heat for the laser.

17. The wearable mini two-line level according to claim 1, characterized in that: In order to reduce the volume of the level, the inner frame (301) only retains a certain swing range of the pendulum structure, which can be optimized to plus or minus 90 degrees.

18. The wearable mini two-line level according to any one of claims 1 to 17, characterized in that: The level has the characteristics of small size, high correction accuracy and fast leveling speed. It is suitable for use on various uneven surfaces and can be worn on sports equipment.

19. The above-mentioned claims are the necessary technical features of the wearable mini two-line level that can automatically level within plus or minus 90 degrees of the present invention. Any equivalent replacement or improvement based on the present invention should be included in the scope of protection of the present invention.

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