vernier caliper for conveniently measuring the depth of a dent

Abstract

The vernier caliper for conveniently measuring and reading the dent depth comprises a vernier caliper body, a blind hole is arranged at a probe depth end of the vernier caliper body, a screw hole is arranged on the vernier caliper body and communicated with the blind hole, a guide sleeve, a sliding seat, a spring and a screw are further arranged, the guide sleeve is fixedly installed in the blind hole, an installation cavity is arranged in the guide sleeve, and a screw thread is arranged on the side wall of the guide sleeve; the sliding seat comprises a sliding block and a probe, the sliding block is located in the installation cavity and is linearly moved and guided, and a strip scale is arranged on the probe; the spring is compressed in the installation cavity and located between the guide sleeve and the sliding block; and the screw rod is passed through the screw hole and screwed into the screw thread hole. When the depth is measured, the probe can be pressed into the dent and locked by the screw first, then the vernier caliper is moved out from the measured position, and the reading is conducted at the angle convenient for observation, so that the convenience and efficiency of measuring the depth in narrow and low space are improved.

Description

Technical Field

[0001] This utility model relates to the field of forensic identification and testing and mechanical processing measurement tools, and in particular to a vernier caliper that is convenient for measuring and reading the depth of dents. Background Technology

[0002] Depth vernier calipers are commonly used measuring tools in forensic identification and testing as well as machining. They are mainly used to measure dimensions such as the depth of dents and the height of steps.

[0003] In traditional forensic testing and machining measurement, the structure of a vernier caliper that can measure the depth of an dent is as follows: Figure 11 As shown, the caliper includes a vernier caliper body 1. The two ends of the vernier caliper body 1 are a jaw measuring end 11 and a probe depth measuring end 12, respectively. A depth measuring rod 17 is movably installed inside the probe depth measuring end 12. The inner end of the depth measuring rod 17 is located inside the vernier caliper body 1, and the outer end of the depth measuring rod 17 has a scale and extends out from the probe depth measuring end 12. When measuring the depth of an indentation, the measuring reference surface (i.e., the end face of the probe depth measuring end 12) needs to be placed against the surface of the workpiece being measured, so that the depth measuring rod 17 extends vertically into the bottom of the indentation. The indentation depth value is obtained by reading the corresponding scale on the depth measuring rod 17.

[0004] However, existing vernier calipers for measuring indentation depth have stringent requirements for the reading angle during use. Specifically, the line of sight must be perfectly aligned with the measurement reference surface during measurement. Reading from above or below will result in a measurement result that is too small or too large due to parallax. This limited viewing angle is extremely inconvenient in narrow or low spaces (such as under vehicles or equipment), requiring operators to bend over or even lie down to meet the viewing angle requirements, which is not only inefficient but also prone to reading errors. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a vernier caliper that facilitates the measurement and reading of indentation depth. It solves the problems of inconvenience, low measurement efficiency, and parallax errors caused by the stringent reading angle requirements of existing depth vernier calipers in narrow or low spaces.

[0006] The technical solution of this utility model is: a vernier caliper for convenient measurement and reading of indentation depth, including a vernier caliper body; the two ends of the vernier caliper body are respectively a jaw measuring end and a probe depth measuring end; the vernier caliper body is provided with a blind hole at the probe depth measuring end; the vernier caliper body is provided with a screw hole communicating with the blind hole. It also includes a guide sleeve, a slide block, a spring, and a screw. The guide sleeve is fixedly installed in a blind hole. The guide sleeve has an internal mounting cavity. The guide sleeve has a threaded hole on its side wall that connects to the mounting cavity. The threaded hole is aligned with the screw hole. The end of the guide sleeve facing the inside of the blind hole has a bottom wall, and the end of the guide sleeve facing the outside of the blind hole has a needle hole that connects the mounting cavity to the outside. A limiting surface is provided between the mounting cavity and the needle hole. The slide block includes a slider and a probe. The slider is slidably installed in the mounting cavity and guided by linear movement. The probe has a scale and extends to the outside through the needle hole. The spring is compressed and installed in the mounting cavity, located between the guide sleeve and the slider. The screw shank passes through the screw hole and is screwed into the threaded hole. The end of the shank enters the mounting cavity. When the end of the shank presses against the side wall of the slider, the slider and the guide sleeve are relatively fixed.

[0007] A further technical solution of this utility model is: the cross-sectional shape of the mounting cavity of the guide sleeve is "U"-shaped, thereby forming a thick-walled area on one side wall of the guide sleeve, and the threaded hole is located in the thick-walled area; correspondingly, the cross-sectional shape of the slider is "U"-shaped, which is adapted to the cross-sectional shape of the mounting cavity, thereby forming a thin-walled section and thick-walled sections distributed on both sides of the thin-walled section on the slider, with the thin-walled section facing the thick-walled area of ​​the guide sleeve.

[0008] A further technical solution of this utility model is: during the slider movement stroke defined by the depth measurement range, the screw end is always directly facing the thin-walled section of the slider; the depth measurement range is 0 to m, where m is the maximum length of the probe exposed to the outside world.

[0009] A further technical solution of this utility model is: the screw type is a wing screw, and the wing screw has two symmetrically arranged lugs on the head.

[0010] A further technical solution of this utility model is: the slider has a recess for positioning the spring on the end face facing the inside of the blind hole. The depth of the recess can accommodate part of the axial length of the spring. There are two recesses, which are respectively arranged in two thick-walled sections. Correspondingly, there are two springs.

[0011] A further technical solution of this utility model is: the end of the probe is hemispherical, and the surface of the hemispherical surface is a convex spherical surface.

[0012] A further technical solution of this utility model is: the guide sleeve is a two-section split structure, which includes a body and an end cap fixedly connected to one end of the body; the needle hole is located at the center of the bottom surface of the body.

[0013] A further technical solution of this utility model is: the end face of the guide sleeve facing outward is flush with the end face of the probe depth measuring end of the vernier caliper body, so that the end face of the probe depth measuring end of the vernier caliper body and the end face of the guide sleeve facing outward together form a measurement reference surface.

[0014] This utility model has the following advantages compared with the prior art: 1. Its telescopic structure with a lockable probe enables indirect measurement of dent depth, making it particularly suitable for forensic identification testing. When measuring dent depth, the probe is first pressed into the dent and locked with a screw. Then, the vernier caliper body is moved out from the measured position, and the reading is taken from an easily observable angle. This completely eliminates the limitation of traditional depth gauges, which require the measurement point to be in its original position and the line of sight to be strictly flush with the reference surface. This improves the convenience and efficiency of depth measurement in narrow, low spaces.

[0015] 2. Its structure, which uses a wing screw to lock the slider, is simple and quick to operate, and the locking is reliable. It effectively avoids inaccurate readings caused by probe slippage during caliper movement, thus ensuring the accuracy of measurement results.

[0016] The present invention will be further described below with reference to the figures and embodiments. Attached Figure Description

[0017] Figure 1 This is a diagram of the external structure of the present invention before measurement. Figure 2 This is a diagram of the internal structure of the present invention before measurement. Figure 3 This is a diagram showing the state of the present invention when the probe is retracted into the guide sleeve; Figure 4 This is a three-dimensional view of the guide sleeve; Figure 5 This is a sectional view of the guide sleeve; Figure 6 This is a stereoscopic view of the slide from the first perspective. Figure 7 A stereoscopic view of the slide from a second perspective; Figure 8 This is a schematic diagram of the structure of the vernier caliper body; Figure 9 for Figure 3 AA section view; Figure 10 This is a diagram showing the usage state of this utility model; Figure 11 This is a schematic diagram of the structure of a vernier caliper that can measure the depth of an indentation in the prior art.

[0018] Legend: Vernier caliper body 1; jaw measuring end 11; probe depth measuring end 12; blind hole 13; screw hole 14; depth measuring rod 17; guide sleeve 2; mounting cavity 21; threaded hole 22; needle hole 23; limiting surface 24; thick-walled area 25; body 26; end cap 27; slide 3; slider 31; thin-walled section 311; thick-walled section 312; recess 313; probe 32; spring 4; screw 5; dent 6; silicone protective sleeve 7. Detailed Implementation

[0019] Example 1: like Figure 1-9 As shown, a vernier caliper for convenient measurement and reading of dent depth includes a vernier caliper body 1, a guide sleeve 2, a slide 3, a spring 4, and a screw 5.

[0020] The vernier caliper body 1 has a jaw measuring end 11 and a probe depth measuring end 12 at its two ends. The vernier caliper body 1 has a blind hole 13 at the probe depth measuring end 12. The vernier caliper body 1 has a screw hole 14 that connects to the blind hole. The screw hole 14 is a smooth hole with a diameter larger than the outer diameter of the screw shank thread.

[0021] The guide sleeve 2 is strip-shaped (equivalent to a flat and long cuboid) and is fixedly installed in the blind hole 13. The guide sleeve 2 has an installation cavity 21 inside. The guide sleeve 2 has a threaded hole 22 on its side wall that connects to the installation cavity. The threaded hole 22 is directly opposite the screw hole 14. The end of the guide sleeve 2 facing the inside of the blind hole 13 has a bottom wall. The end of the guide sleeve 2 facing the outside of the blind hole 13 has a needle hole 23. The needle hole 23 connects the installation cavity 21 to the outside. A limiting surface 24 is provided between the installation cavity 21 and the needle hole 23.

[0022] The slide block 3 includes a slider 31 and a probe 32. The slider 31 is slidably installed in the mounting cavity 21 and is guided by linear movement. The two ends of the slider 31 face the outside of the blind hole 13 and the inside of the blind hole 13, respectively. The end face of the slider 31 facing the outside of the blind hole 13 is the outer end face. The probe 32 is provided with a scale (minimum scale value is 1mm) set along its length direction. The probe 32 extends to the outside through the needle hole 23.

[0023] The spring 4 is compressed in the mounting cavity 21 and located between the guide sleeve 2 and the slider 31. The spring 4 forces the slider 31 to press against the limiting surface 24 through its elastic force, thereby keeping the probe 32 at its maximum length extending to the outside.

[0024] The shank of screw 5 passes through screw hole 14 and is screwed into threaded hole 22, with the end of the shank entering mounting cavity 21. When the end of the shank presses against the side wall of slider 31, slider 31 is pressed against the wall of mounting cavity 21, thereby fixing slider 31 relative to guide sleeve 2.

[0025] More specifically, the vernier caliper body 1 has the aforementioned screw hole 14 on the front side where the length scale is located. Based on this design, when the operator uses the jaws to perform routine size measurements, if depth measurements are required simultaneously, the direction of the locking screw is consistent with the line of sight when reading the main scale scale, which is ergonomic and makes operation more convenient. The probe can be locked without changing the grip posture, further improving measurement efficiency.

[0026] More specifically, the outer end face of the guide sleeve 2 is flush with the end face of the probe depth measuring end 12 of the vernier caliper body 1, so that the end face of the probe depth measuring end 12 of the vernier caliper body 1 and the outer end face of the guide sleeve 2 together form a measurement reference surface.

[0027] More specifically, the mounting cavity 21 of the guide sleeve 2 has a concave cross-sectional shape, thus forming a thick-walled region 25 on one side wall of the guide sleeve 2, where the threaded hole 22 is located. Correspondingly, the cross-sectional shape of the slider 31 is a concave shape that matches the cross-sectional shape of the mounting cavity 21, thus forming a thin-walled section 311 and thick-walled sections 312 distributed on both sides of the thin-walled section 311. The thin-walled section 311 is directly opposite the thick-walled region 25 of the guide sleeve 2. Based on this structure, firstly, the guide sleeve 2 and the slider 31 cannot rotate relative to each other, but can only slide in a straight line relative to each other, ensuring that the bar scale on the probe always faces the preset direction (usually the direction that is easy for the user to observe), preventing the scale from becoming invisible due to the rotation of the slider during movement or measurement, and ensuring the intuitiveness and accuracy of the reading; secondly, the "U"-shaped cross-sectional shape of the slider 31 provides a stable clamping contact surface for the end of the screw 5, enhancing the reliability of locking; thirdly, the "U"-shaped cross-sectional shape of the mounting cavity 21 naturally forms a region with increased wall thickness on one side wall of the guide sleeve 2, namely the thick-walled region 25. Setting the threaded hole 22 in the thick-walled region 25 can give the threaded hole 22 a longer axial engagement length, thereby greatly improving the strength, durability and reliability of the thread and the connection of the screw 5.

[0028] More specifically, during the travel of the slider 31 defined by the depth measurement range, the end of the screw 5 is always directly facing the thin-walled section 311 of the slider 31; the depth measurement range is 0 to m, where m is the maximum length of the probe 32 exposed to the outside world.

[0029] More specifically, screw category 5 is the wing screw, which has two symmetrically arranged lugs on its head. Based on this design, the operator can easily and quickly tighten or loosen the screw with just their fingers without the need for additional tools such as screwdrivers, achieving freehand operation and enhancing the portability and ease of use of the tool.

[0030] More specifically, the slider 31 has a recess 313 for positioning the spring 4 on the end face facing the inside of the blind hole 13. The depth of the recess 313 can accommodate part of the axial length of the spring 4. There are two recesses 313, which are respectively arranged in two thick-walled sections 312. Correspondingly, there are two springs 4. Based on this design, firstly, the spring 4 and the slider 31 partially overlap in the axial space, thereby significantly shortening the overall axial dimension of the mounting cavity 21 of the guide sleeve 2 while ensuring the same working stroke of the spring 4 and the guide length of the slider 31, thus optimizing the compactness of the product structure. Secondly, the design of the recess 313 ensures that the spring 4 maintains a stable axial position during compression and rebound, preventing skewness or displacement, ensuring the uniformity of the elastic force and the smoothness of linear movement, thereby improving the repeatability of the measurement and the durability of the components. Thirdly, since the cross-section of the slider 31 is U-shaped and its flat plate structure has limited thickness, if only one spring is set, the spring diameter is limited by the thickness of the slider, which may lead to insufficient elastic force. However, setting two springs symmetrically can provide sufficient elastic force and ensure the balance of forces on the slider, thus ensuring the reliability of the measurement operation.

[0031] More specifically, the end of probe 32 is hemispherical, and the surface of the hemispherical is convex.

[0032] More specifically, the guide sleeve 2 is a two-part split structure, comprising a body 26 and an end cap 27 fixedly connected to one end of the body 26. The needle hole 23 is located at the center of the bottom surface of the body 26.

[0033] More specifically, a silicone protective sleeve 7 is movably mounted on the outside of the probe 32. When not measuring, the silicone protective sleeve 7 is on the probe 32. When measuring, the silicone protective sleeve 7 needs to be removed.

[0034] The working principle of this utility model is briefly described below, taking the measurement of dent depth on a collision vehicle during a forensic appraisal as an example: like Figure 10-11 As shown, during measurement: First, align the probe depth measuring end 12 of the vernier caliper body 1 with the indentation 6, and insert the probe 32 into the indentation 6, so that the end of the probe 32 rests against the deepest part of the indentation 6, with the probe 32 perpendicular to the outer plane of the indentation 6. Apply force to make the vernier caliper body 1 and the guide sleeve 2 move down together against the elastic force of the spring 4, so that the measuring reference surface is stably attached to the outer plane of the indentation 6. At this time, the exposed length of the probe 32 represents the depth of the indentation 6, completing the depth capture (during this process, the function of the spring 4 is to keep the position of the slide 3 stable through its elastic force).

[0035] Then, tighten the screw 5 (i.e., the wing screw) on the side of the probe depth measuring end 12 of the vernier caliper body 1. This will press the end of the screw 5 against the thin-walled section 311 of the slider 31, using friction to firmly lock the slider 31 in its current position, preventing it from moving relative to the guide sleeve 2.

[0036] Finally, the entire vernier caliper body 1 can be removed from the workpiece. At this point, since the extension position of the probe 32 is locked, the depth value of the indentation 6 is fixed. The operator can easily read the scale on the probe 32 under sufficient lighting and a comfortable viewing angle, thereby completing the depth measurement.

Claims

1. A vernier caliper for convenient measurement and reading of indentation depth, comprising a vernier caliper body; the two ends of the vernier caliper body are the jaw measuring end and the probe depth measuring end, respectively; Its characteristics are: The vernier caliper body has a blind hole at the probe depth measuring end; the vernier caliper body also has screw holes that connect to the blind hole. It also includes a guide sleeve, a slide block, a spring, and a screw. The guide sleeve is fixedly installed in a blind hole. The guide sleeve has an internal mounting cavity. The guide sleeve has a threaded hole on its side wall that connects to the mounting cavity. The threaded hole is aligned with the screw hole. The end of the guide sleeve facing the inside of the blind hole has a bottom wall, and the end of the guide sleeve facing the outside of the blind hole has a needle hole that connects the mounting cavity to the outside. A limiting surface is provided between the mounting cavity and the needle hole. The slide block includes a slider and a probe. The slider is located in the mounting cavity and is guided by linear movement. The probe has a strip of scale and extends to the outside through the needle hole. The spring is compressed and located in the mounting cavity between the guide sleeve and the slider. The screw shank passes through the screw hole and is screwed into the threaded hole. The end of the shank enters the mounting cavity. When the end of the shank presses against the side wall of the slider, the slider and the guide sleeve are relatively fixed.

2. The vernier caliper for conveniently measuring and reading the depth of an indentation as described in claim 1, characterized in that: The cross-sectional shape of the mounting cavity of the guide sleeve is "U" shaped, thereby forming a thick-walled area on one side wall of the guide sleeve, and the threaded hole is located in the thick-walled area; correspondingly, the cross-sectional shape of the slider is "U" shaped to match the cross-sectional shape of the mounting cavity, thereby forming a thin-walled section and thick-walled sections distributed on both sides of the thin-walled section on the slider, with the thin-walled section facing the thick-walled area of ​​the guide sleeve.

3. The vernier caliper for convenient measurement and reading of indentation depth as described in claim 2, characterized in that: During the slider movement stroke defined by the depth measurement range, the screw end is always directly facing the thin-walled section of the slider; the depth measurement range is 0 to m, where m is the maximum length of the probe exposed to the outside.

4. The vernier caliper for convenient measurement and reading of indentation depth as described in claim 3, characterized in that: The screw type is a wing screw, which has two symmetrically arranged lugs on the head.

5. The vernier caliper for convenient measurement and reading of indentation depth as described in claim 4, characterized in that: the slider... A recess for positioning the spring is provided on the end face facing the inside of the blind hole. The depth of the recess is sufficient to accommodate part of the axial length of the spring. There are two recesses, which are respectively arranged in two thick-walled sections. Correspondingly, there are two springs.

6. The vernier caliper for convenient measurement and reading of indentation depth as described in claim 5, characterized in that: The probe tip is hemispherical, and the surface of the hemispherical surface is convex.

7. The vernier caliper for convenient measurement and reading of indentation depth as described in claim 6, characterized in that: The guide sleeve has a two-part split structure, which includes a main body and an end cap fixedly connected to one end of the main body; the needle hole is located at the center of the bottom surface of the main body.

8. The vernier caliper for convenient measurement and reading of indentation depth as described in claim 7, characterized in that: The outer end face of the guide sleeve is flush with the end face of the probe measuring end of the vernier caliper body, so that the end face of the probe measuring end of the vernier caliper body and the outer end face of the guide sleeve together form a measurement reference surface.

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