Cross string micrometer caliper
By combining the functions of vernier calipers and micrometers, and introducing a crosshair positioning rod design, the problem of large errors in traditional internal diameter measuring tools on large workpieces is solved, achieving efficient and accurate measurement of ultra-large internal diameters.
Patent Information
- Application Number
- CN202520650919.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-09
- Publication Date
- 2026-02-03
- Estimated Expiration
- 2035-04-09
AI Technical Summary
Existing internal diameter measuring tools suffer from large errors, complex operation, and low efficiency when measuring large-sized workpieces. In particular, traditional three-jaw micrometers cannot effectively measure ultra-large internal diameters.
Combining the functions of vernier calipers and micrometers, and introducing a crosshair positioning rod design, the precise measurement of large inner diameters can be achieved through the combination of the crosshair positioning rod and micrometer fine adjustment.
It improves measurement accuracy and efficiency, reduces errors, is suitable for measuring ultra-large inner diameters, is simple to operate, low in cost, and applicable to rings, pipes, and mechanical parts of different specifications.
Smart Images
Figure CN223869950U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a high-precision measuring tool, and in particular a novel measuring device that combines a vernier caliper, a micrometer, and a crosshair positioning rod, which is especially suitable for high-precision measurement of the inner diameter of large workpieces. Background Technology
[0002] This utility model relates to a high-precision measuring tool, specifically a novel measuring device combining a vernier caliper, a micrometer, and a crosshair positioning rod, suitable for high-precision internal diameter measurement of large-sized workpieces. In the field of precision measurement, measuring the internal diameter of workpieces is a common and important task, especially in industries such as machinery manufacturing, metal processing, and precision instrument production, where high accuracy is required for internal diameter measurement. Currently, common internal diameter measuring tools mainly include vernier calipers, micrometers, and three-jaw internal micrometers, each with its own advantages and disadvantages.
[0003] Vernier calipers are a general-purpose measuring tool capable of measuring dimensions such as outer diameter, inner diameter, and depth, and have good applicability. However, when measuring inner diameters, the measuring jaws of vernier calipers are relatively long and prone to wobbling, leading to unstable measurement results, especially when measuring larger inner diameters, where the error is larger and affects measurement accuracy.
[0004] Traditional micrometers are typically used for high-precision measurements, but they are mainly suitable for measuring outer diameters and are difficult to use for directly measuring inner diameters. Some existing inside micrometers can measure inner diameters, but they are generally suitable for measuring a smaller range and require a three-jaw chuck or special structure to ensure measurement stability, making the measurement operation more complex.
[0005] Three-jaw inside micrometers are used for measuring internal diameters and can achieve high accuracy, but their applicability is limited, especially for measuring very large diameter workpieces (such as pipes and the internal cavities of large mechanical parts), where measurement is quite difficult. Furthermore, the three-jaw inside micrometer has a complex measuring structure, is relatively expensive, and may introduce measurement errors on certain specially shaped workpieces (such as elliptical holes).
[0006] Each of the three measuring tools mentioned above has its advantages and disadvantages. When measuring inner diameters, vernier calipers can cause instability in measurement data due to potential wobbling of the measuring jaws, especially when measuring large inner diameters. Inside micrometers require a high level of skill to adjust the measuring position, are prone to errors due to improper operation, and are complex and inconvenient to operate. Three-jaw inside micrometers require precise alignment of the measuring point, making the adjustment process cumbersome and affecting measurement efficiency. For measuring extremely large inner diameters (such as inside pipes or mechanical housings), these traditional measuring tools lack efficient and accurate measurement solutions. Utility Model Content
[0007] The purpose of this invention is to address the shortcomings and deficiencies of existing technologies by providing a cross-chord micrometer caliper that combines the functions of a vernier caliper and a micrometer, and incorporates a cross-chord positioning rod design. It has the functions of a regular caliper and a micrometer, and is also suitable for measuring inner diameters of larger diameters (such as 30mm and above), especially for measuring ultra-large inner diameters, thus solving the problem that traditional three-jaw micrometers cannot measure excessively large inner diameters.
[0008] To achieve the above objectives, the present invention adopts the following technical solution: it includes a caliper body 1, a vernier scale 2, a vernier scale adjustment section 3, and a micrometer adjustment rod 4. The vernier scale 2 is sleeved on the caliper body 1. The vernier scale adjustment section 3 is connected to the right side of the vernier scale 2. The micrometer adjustment rod 4 is fixedly installed on the lower right side of the vernier scale adjustment section 3. The micrometer screw 41 of the micrometer adjustment rod 4 is abutted on the vernier scale 2.
[0009] The fixing rod 42 of the micrometer adjustment rod 4 is embedded in the lower part of the vernier adjustment section 3 and passes through the lower part of the vernier adjustment section 3.
[0010] The micrometer screw 41 serves as the measuring rod of the micrometer adjustment rod 4 and is connected to the vernier scale 2. The micrometer adjustment rod 4 is equipped with a knob 43 and a fine adjustment knob 44.
[0011] A locking screw 31 is provided on the vernier scale adjustment section 3. The locking screw 31 passes through the vernier scale adjustment section 3 and is abutted against the vernier scale 2.
[0012] The main scale of the caliper body 1 is provided with a cross-shaped positioning rod 5. The cross-shaped positioning rod 5 includes a positioning rod body 51, a connecting part 52, and a cross rod 53. The positioning rod body 51, the connecting part 52, and the cross rod 53 are an integral structure. The cross rod 53 is set on the top of the positioning rod body 51 through the connecting part 52. The cross rod 53 and the positioning rod body 51 are arranged in a cross shape perpendicularly.
[0013] The working principle of this utility model is as follows: It has the effect of three measuring devices. When in use, first open the vernier scale 2, clamp the workpiece to be measured between the two legs of the caliper, and initially obtain the inner diameter range of the workpiece. By sliding and adjusting the vernier scale 2, read the scale value of the vernier caliper to obtain preliminary measurement data at the millimeter level. The workpiece can be measured using the vernier scale 2 with the conventional caliper function.
[0014] After completing the rough measurement with the vernier caliper, adjust the knob 43 and the fine adjustment knob 44 of the micrometer adjustment lever 4, and use the scale line of the fine adjustment knob 44 to measure the measurement data using the micrometer function to obtain more accurate measurement data.
[0015] When measuring large inner diameter workpieces, place both ends of the cross rod 53 of the cross positioning rod 5 tightly against the inner wall of the circle, open both ends of the caliper to the integer position closest to the circle, then tighten the locking screw 31, and then fine-tune the micrometer until the caliper is in the measuring position. The caliper reads the integer and the micrometer reads the decimal. Compared with the three-grip micrometer, this utility model is simpler in principle, easier to control in terms of workmanship accuracy, and has extremely low cost. It can accurately measure ultra-large inner diameters.
[0016] The advantages of this utility model after adopting the above technical solution are as follows: it simultaneously possesses the functions of a caliper and a micrometer, ensuring both measurement accuracy and efficiency. This utility model is convenient to operate, easy to master, and has a simple structure. Its usage method is similar to that of a common vernier caliper, making it easy to learn. It allows for quick adjustment of the measurement direction via a sliding positioning rod, improving measurement efficiency. It is suitable for measuring inner diameters of larger diameters (e.g., 30mm and above), especially for measuring ultra-large inner diameters, solving the problem that traditional three-jaw micrometers cannot measure excessively large inner diameters.
[0017] This device solves the problem of large measurement errors caused by the structural limitations of traditional vernier calipers. Through a combination of a crosshair positioning rod and micrometer fine-tuning, it effectively reduces errors and improves measurement reliability. It is suitable for measuring the inner diameter of various sizes of rings, pipes, and mechanical parts, especially for measuring ultra-large inner diameters. It reduces errors and improves measurement stability by overcoming the errors caused by operating angles and oscillations in traditional measuring tools, thus improving the reliability of measurement data. Attached Figure Description
[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0019] Figure 1 This is a schematic diagram of the utility model.
[0020] Figure 2 yes Figure 1 Another viewpoint;
[0021] Figure 3 This is a front view of the present invention;
[0022] Figure 4 This is a state diagram of the workpiece when measuring its inner diameter according to this utility model.
[0023] Explanation of reference numerals in the attached drawings: 1. Caliper body; 2. Vernier scale; 3. Vernier scale adjustment section; 4. Micrometer adjustment rod; 41. Micrometer screw; 42. Fixing rod; 43. Knob; 44. Fine adjustment knob; 31. Locking screw; 5. Cross-shaped positioning rod; 51. Positioning rod body; 52. Connecting part; 53. Cross rod. Detailed Implementation
[0024] See Figure 1 As shown in the diagram, the technical solution adopted in this specific embodiment is as follows: It includes a caliper body 1, a vernier scale 2, a vernier scale adjustment section 3, and a micrometer adjustment rod 4. The vernier scale 2 is sleeved on the caliper body 1. The vernier scale adjustment section 3 is connected to the right side of the vernier scale 2. The micrometer adjustment rod 4 is fixedly installed on the lower right side of the vernier scale adjustment section 3. The micrometer screw 41 of the micrometer adjustment rod 4 is abutted against the vernier scale 2. It integrates a micrometer into a conventional caliper.
[0025] The fixing rod 42 of the micrometer adjustment rod 4 is embedded in the lower part of the vernier adjustment section 3 and passes through the lower part of the vernier adjustment section 3.
[0026] The micrometer screw 41 serves as the measuring rod of the micrometer adjustment rod 4 and is connected to the vernier scale 2. The micrometer adjustment rod 4 is equipped with a knob 43 and a fine adjustment knob 44.
[0027] A locking screw 31 is provided on the vernier scale adjustment section 3. The locking screw 31 passes through the vernier scale adjustment section 3 and abuts against the vernier scale 2. A cross-shaped positioning rod 5 is provided on the main scale of the caliper body 1. The cross-shaped positioning rod 5 includes a positioning rod body 51, a connecting part 52, and a cross rod 53. The positioning rod body 51, the connecting part 52, and the cross rod 53 are an integral structure. The cross rod 53 is set on the top of the positioning rod body 51 through the connecting part 52. The cross rod 53 and the positioning rod body 51 are arranged in a cross shape perpendicularly.
[0028] It functions as three measuring devices. First, open the vernier caliper 2 and clamp the workpiece between the two legs of the caliper to initially obtain the workpiece's inner diameter range. Adjust the vernier caliper 2 by sliding it and read the scale value to obtain preliminary measurement data at the millimeter level. The vernier caliper 2 can then be used to perform measurements using conventional calipers. After completing the coarse measurement with the vernier caliper, adjust the knob 43 and fine adjustment knob 44 of the micrometer adjustment lever 4, and use the scale of the fine adjustment knob 44 to perform a micrometer-level measurement to obtain more accurate data.
[0029] When measuring large inner diameter workpieces, place both ends of the cross bar 53 of the cross pin positioning rod 5 tightly against the inner wall of the circle, open both ends of the caliper to the nearest integer position to the circle, then tighten the locking screw 31, and then fine-tune the micrometer until the caliper is in the measuring position. The caliper reads the integer, and the micrometer reads the decimal. Compared with the three-jaw micrometer, this invention is simpler in principle, easier to control in terms of workmanship accuracy, and has extremely low cost. It can accurately measure ultra-large inner diameters. The cross bar 53 and the cross pin positioning rod 5 can also be separate, meaning that cross bars of different lengths can be replaced to adapt to circles of different diameters.
[0030] After adopting the above technical solution, the beneficial effects of this utility model are: it has the functions of both calipers and micrometers, ensuring measurement accuracy and efficiency.
[0031] This utility model is convenient to operate, easy to master, and has a simple structure. Its usage is similar to that of a regular vernier caliper, making it easy to learn. It allows for quick adjustment of the measurement direction via a sliding positioning rod, improving measurement efficiency. It is suitable for measuring inner diameters of larger diameters (e.g., 30mm and above), especially for measuring extra-large inner diameters, solving the problem that traditional three-jaw micrometers cannot measure excessively large inner diameters.
[0032] This device solves the problem of large measurement errors caused by the structural limitations of traditional vernier calipers. Through a combination of a crosshair positioning rod and micrometer fine-tuning, it effectively reduces errors and improves measurement reliability. It is suitable for measuring the inner diameter of various sizes of rings, pipes, and mechanical parts, especially for measuring ultra-large inner diameters. It reduces errors and improves measurement stability by overcoming the errors caused by operating angles and oscillations in traditional measuring tools, thus improving the reliability of measurement data.
[0033] The above description is only used to illustrate the technical solution of this utility model and is not intended to limit it. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solution of this utility model, as long as they do not depart from the spirit and scope of the technical solution of this utility model, should be covered within the scope of the claims of this utility model.
Claims
1. A crosshair micrometer caliper, characterized in that: It includes a caliper body (1), a vernier scale (2), a vernier scale adjustment section (3), and a micrometer adjustment rod (4). The vernier scale (2) is fitted onto the caliper body (1). The vernier scale adjustment section (3) is connected to the right side of the vernier scale (2). The micrometer adjustment rod (4) is fixedly installed on the lower right side of the vernier scale adjustment section (3). The micrometer screw (41) of the micrometer adjustment rod (4) is abutted onto the vernier scale (2).
2. The crosshair micrometer caliper according to claim 1, characterized in that: The fixing rod (42) of the micrometer adjustment rod (4) is embedded in the lower part of the vernier adjustment section (3) and passes through the lower part of the vernier adjustment section (3).
3. The crosshair micrometer caliper according to claim 1, characterized in that: The micrometer screw (41) is connected to the vernier scale (2) as the measuring rod of the micrometer adjustment rod (4). The micrometer adjustment rod (4) is equipped with a knob (43) and a fine adjustment knob (44).
4. The crosshair micrometer caliper according to claim 1, characterized in that: The vernier adjustment section (3) is provided with a locking screw (31), which passes through the vernier adjustment section (3) and abuts against the vernier scale (2).
5. The crosshair micrometer caliper according to claim 1, characterized in that: The main scale of the caliper body (1) is provided with a cross-shaped positioning rod (5). The cross-shaped positioning rod (5) includes a positioning rod body (51), a connecting part (52), and a cross rod (53). The positioning rod body (51), the connecting part (52), and the cross rod (53) are an integral structure. The cross rod (53) is set on the top of the positioning rod body (51) through the connecting part (52). The cross rod (53) and the positioning rod body (51) are arranged perpendicularly in a cross shape.