A length measuring device

Abstract

The length measuring device comprises a first adjusting rod, a second adjusting rod, an arc-shaped scale, an adjusting plate and a pointer. The two adjusting rods are hinged, the scale is fixed to the second adjusting rod, the pointer is fixed to the first adjusting rod and points to the scale, and the hinge point of the two adjusting rods is located at the center point of the scale. The adjusting plate forms a rolling circle around the two adjusting rods, and the arc is greater than 360 degrees. One end of each of the two adjusting rods is connected to the adjusting plate. When the relative position between the two adjusting rods is adjusted, the arc formed by the adjusting plate changes in position to abut against the inner circle of the measured article, and the inner circle circumference of the measured article is determined based on the pointer pointing to the scale. The scheme adopts the lever principle between the two adjusting rods to simulate the inner circle circumference of the measured article by adjusting the rolling circle circumference formed by the adjusting plate, and then obtains the inner circle circumference data of the measured article according to the scale, thereby solving the problem of accurately measuring the inner circle circumference of the measured article which cannot be solved in the prior art.

Description

Technical Field

[0001] This application relates to the field of measuring equipment technology, and in particular to a length measuring device. Background Technology

[0002] In daily life, people often buy watches. To check if a watch fits, the wearer usually needs to try it on. Currently, there is no device on the market specifically for measuring the circumference of the inner ring of a watch, such as measuring the circumference of the inner ring of a watch strap. This would allow the wearer to clearly know what size watch would fit their wrist without needing to try it on. Currently, watches are measured using a plastic ruler, which can be placed over the outside of the wrist to accurately measure wrist length. However, it cannot directly measure the inner ring length of the watch after it has been bent. In practical applications, it is necessary to know the minimum and maximum wrist circumference that the watch is designed to fit, but this plastic ruler cannot accurately measure these dimensions. Therefore, the problem of accurately measuring the inner circumference of an object cannot be solved with current technology. Summary of the Invention

[0003] One objective of this application is to provide a length measuring device to solve the problem of accurately measuring the inner circumference of an object to be measured, a problem that cannot be solved in the prior art.

[0004] This application provides a length measuring device for measuring the inner circumference of an object to be measured. The device includes:

[0005] First adjusting lever, second adjusting lever, arc-shaped measuring scale, adjusting plate, pointer;

[0006] The first adjusting rod is hinged to the second adjusting rod, the arc-shaped measuring scale is fixed to the second adjusting rod, the pointer is fixed to the first adjusting rod and points to the scale of the arc-shaped measuring scale, and rotates with the first adjusting rod. The hinge point between the first adjusting rod and the second adjusting rod is located at the center point of the arc-shaped measuring scale.

[0007] The adjusting plate forms a circle around the first adjusting rod and the second adjusting rod, with the arc of the circle being greater than 360 degrees. One end of the first adjusting rod and one end of the second adjusting rod are respectively connected to the adjusting plate. When the plate is placed on the inner circle of the object to be measured to measure the circumference, the relative position of the first adjusting rod and the second adjusting rod is adjusted at the hinge point so that the arc formed by the adjusting plate changes with the relative position between the first adjusting rod and the second adjusting rod until it reaches the inner circle of the object to be measured. The inner circumference of the object to be measured is then determined based on the scale of the arc-shaped measuring scale pointed to by the pointer.

[0008] Preferably, the device further includes:

[0009] The pointer has a screw portion for engaging with the nut to secure it to the first adjusting rod.

[0010] Preferably, the device further includes:

[0011] A first adjusting part is fixedly connected to the first adjusting rod and is used to control the rotation of the first adjusting rod.

[0012] Preferably, the device further includes:

[0013] The second adjustment part is fixedly connected to the second adjustment rod and is used to assist the first adjustment part in controlling the rotation of the first adjustment rod.

[0014] Preferably, the first adjusting part is perpendicular to the circular cross-section of the adjusting plate and extends beyond the circular shape of the adjusting plate.

[0015] Preferably, when the circumference of the circle formed by the adjusting plate changes, the circumference of the circle formed by the adjusting plate is the same as the data represented by the scale on the arc-shaped measuring scale pointed to by the pointer.

[0016] Preferably, the device further includes:

[0017] A first connecting buckle is used to connect one end of the first adjusting rod to the adjusting plate.

[0018] The first connecting buckle has a first through hole for fixing the relative position of the overlapping portions of the adjusting plate in the rolled-up state by passing the adjusting plate through the first through hole when the adjusting plate is rolled up.

[0019] Preferably, when the adjusting plates are rolled into a circle, the portion of the adjusting plates that overlaps through the first perforation is located on the side furthest from the center point compared to the portion of the adjusting plates that is connected to the first adjusting rod via the first connecting buckle.

[0020] Preferably, the device further includes:

[0021] The second connecting buckle connects one end of the second adjusting rod to the adjusting plate.

[0022] The second connecting buckle has a second through hole for fixing the relative position of the overlapping portions of the adjusting plate in the rolled-up state by passing the adjusting plate through the second through hole when the adjusting plate is rolled up.

[0023] Preferably, when the adjusting plates are rolled into a circle, the portion of the adjusting plates that overlaps through the second perforation is located closer to the center point than the portion of the adjusting plates that is connected to the second adjusting rod via the second connecting buckle.

[0024] Compared with the prior art, this application provides a length measuring device for measuring the inner circumference of an object to be measured, comprising: a first adjusting rod, a second adjusting rod, an arc-shaped measuring scale, an adjusting plate, and a pointer; the first adjusting rod and the second adjusting rod are hinged together, the arc-shaped measuring scale is fixed on the second adjusting rod, and the pointer is fixed on the first adjusting rod and points to the scale of the arc-shaped measuring scale, and rotates with the first adjusting rod; the hinge point of the first adjusting rod and the second adjusting rod and the fixed position of the pointer are both located at the center point of the arc-shaped measuring scale; the adjusting plate is formed into a circle. An arc encircling the first and second adjusting rods, with a radius greater than 360 degrees, is formed. One end of the first adjusting rod and one end of the second adjusting rod are respectively connected to the adjusting plate. When measuring the circumference of the inner ring of the object to be measured, the relative positions of the first and second adjusting rods are adjusted at the hinge point. This causes the arc formed by the adjusting plate to change with the relative position between the first and second adjusting rods until it reaches the inner ring of the object to be measured. The inner ring circumference of the object to be measured is then determined based on the scale of the arc-shaped measuring scale pointed to by the pointer. This solution uses the lever principle between the two adjusting rods to simulate the inner ring circumference of the object to be measured by adjusting the circumference of the arc formed by the adjusting plates. The inner ring circumference data of the object to be measured is then obtained according to the arc-shaped measuring scale, solving the problem of accurately measuring the inner ring circumference of the object to be measured, which is currently unsolvable in existing technologies. Attached Figure Description

[0025] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0026] Figure 1 This is a schematic diagram of one embodiment of the device described in this application;

[0027] Figure 2 This is a front view of one embodiment of the device described in this application;

[0028] Figure 3 This is a rear view of one embodiment of the device described in this application;

[0029] Figure 4 This is a side view of one embodiment of the device described in this application;

[0030] Figure 5 This is a partial cross-sectional view of one embodiment of the device described in this application;

[0031] Figure 6 This is a cross-sectional view of one embodiment of the device described in this application;

[0032] Figure 7 This is a schematic diagram illustrating the measurement of an article by one embodiment of the apparatus described in this application;

[0033] Figure 8 This is a schematic diagram illustrating the usage effect of one embodiment of the device described in this application;

[0034] Figure 9 This is a schematic diagram of the scale on the arc-shaped measuring scale of one embodiment of the device described in this application;

[0035] The same or similar reference numerals in the accompanying drawings represent the same or similar parts. Detailed Implementation

[0036] This application provides a length measuring device, which is described below in conjunction with... Figures 1 to 9 Embodiments of the apparatus described in this application will be further described.

[0037] A length measuring device for measuring the inner circumference of an article 11 to be measured, comprising at least the following features:

[0038] First adjusting rod 1, second adjusting rod 2, arc-shaped measuring scale 3, adjusting plate 4, pointer 5;

[0039] The first adjusting rod 1 is hinged to the second adjusting rod 2. The arc-shaped measuring scale 3 is fixed on the second adjusting rod 2. The pointer 5 is fixed on the first adjusting rod 1. The pointer 5 points to the scale of the arc-shaped measuring scale 3 and rotates with the first adjusting rod 1. The hinge point of the first adjusting rod 1 and the second adjusting rod 2 and the fixed position of the pointer 5 are both located at the center point of the arc-shaped measuring scale 3.

[0040] The adjusting plate 4 forms a circle around the first adjusting rod 1 and the second adjusting rod 2. The arc of the adjusting plate 4 is greater than 360 degrees, that is, it completes at least one full circle. One end of the first adjusting rod 1 and one end of the second adjusting rod 2 are respectively connected to the adjusting plate 4. When measuring the circumference of the inner circle of the item to be measured 11, the relative position of the first adjusting rod 1 and the second adjusting rod 2 is adjusted at the hinge point so that the arc formed by the adjusting plate 4 changes with the relative position between the first adjusting rod 1 and the second adjusting rod 2 until it reaches the inner circle of the item to be measured 11. The inner circumference of the item to be measured 11 is determined based on the scale of the arc-shaped measuring ruler 3 pointed to by the pointer 5.

[0041] The hinge point between the first adjusting rod 1 and the second adjusting rod 2 is the midpoint of each adjusting rod. An arc-shaped measuring scale 3 is fixed to the second adjusting rod 2. The arc of the measuring scale 3 can be a 180-degree scale or a semi-circular scale. The center point of the arc-shaped measuring scale 3 is the straight-line distance between the two ends of the diameter side of the semi-circular scale, and this center point is the hinge point between the first adjusting rod 1 and the second adjusting rod 2. A pointer 5 can be fixed to the first adjusting rod 1 and points to a graduation within the arc-shaped measuring scale 3. When the relative positions of the two adjusting rods change based on the hinge point, the pointer 5 changes position relative to the second adjusting rod 2, following the change in position of the first adjusting rod 1. Simultaneously, the pointer 5 can point to a graduation within the range of the arc-shaped measuring scale 3.

[0042] Adjusting plate 4 can be a rectangular flat plate, made of metal. When this plate is rolled up, it forms a rolled circle when viewed from the direction of the curved edge. This rolled circle can encircle both the first and second adjusting rods, meaning it wraps around the two adjusting rods at least once, i.e., the arc is greater than 360 degrees. The two adjusting rods are connected to adjusting plate 4. When the relative positions of the two hinged adjusting rods change around the center point, the direction in which pointer 5 points to the arc-shaped measuring scale 3 changes, and simultaneously, the circumference of the rolled circle formed by adjusting plate 4 also changes. Based on this, as... Figure 7 As shown, when testing the circumference of the inner ring of the item 11, the rolled circle can be placed inside the inner ring of the item 11. The relative positions of the two adjusting rods are adjusted to change the circumference of the rolled circle until the adjusting plate 4 contacts the surface of the inner ring of the item 11. Ideally, the surface of the adjusting plate 4 should be in contact with most of the surface of the inner ring of the item 11. In this case, the circumference of the rolled circle is equal to the circumference of the inner ring of the item 11, with very little error. At this point, the scale of the arc-shaped measuring ruler 3 pointed to by the pointer 5 can be the circumference data of the item 11 or data related to the circumference. The item 11 can be a watch.

[0043] In some embodiments of this application, the device further includes a nut 6, and the pointer 5 also has a screw portion, which can cooperate with the nut 6 to fix the screw on the first adjusting rod 1.

[0044] In some embodiments of this application, the device further includes a first adjusting part 7, which is fixedly connected to the first adjusting rod 1 and is used to control the rotation of the first adjusting rod 1.

[0045] Both adjusting rods are placed inside the rolled circle formed by the adjusting plate 4. When the item to be tested 11 is placed in, it is not convenient to operate the two adjusting rods to move them relative to each other. At this time, the first adjusting part 7 is used. The operation of the first adjusting part 7 replaces the direct operation of the first adjusting rod 1, making the operation more convenient.

[0046] In some embodiments of this application, the device further includes a second adjusting part 8, which is fixedly connected to the second adjusting rod 2 and is used to assist the first adjusting part 7 in controlling the rotation of the first adjusting rod 1.

[0047] After adding a second adjusting part 8 to the second adjusting rod 2, the relative position of the first adjusting rod 1 and the second adjusting rod 2 can be controlled by controlling the first adjusting part 7 and the second adjusting part 8, which further facilitates the operation.

[0048] In some embodiments of this application, the first adjustment part 7 is perpendicular to the circular cross-section of the adjustment plate 4 and extends out of the circle formed by the adjustment plate 4.

[0049] The first adjusting part 7 is perpendicular to the circle formed by the adjusting plate 4, so that the first adjusting part 7 extends beyond the circle formed by the adjusting plate 4. This allows the operation of the first adjusting rod 1 to be performed outside the entire object to be tested 11, and the larger external space facilitates the adjustment action. By adjusting the first adjusting part 7 from the outside of the object to be tested 11, the first adjusting rod 1 is adjusted. Similarly, the second adjusting part 8, which cooperates with the first adjusting part 7, can also be provided with reference to this embodiment.

[0050] In some embodiments of this application, when the circumference of the circle formed by the adjusting plate 4 changes, the circumference of the circle formed by the adjusting plate 4 is the same as the data represented by the scale on the arc-shaped measuring ruler 3 pointed to by the pointer 5.

[0051] For ease of measurement, the circumference of the circle formed by the adjusting plate 4 can be directly written on the arc-shaped measuring scale 3. That is, the data represented by the scale of the arc-shaped measuring scale 3 is the circumference of the circle. For example, when the circumference of the circle is 250 millimeters, the pointer 5 will point to the "250 millimeters" marking on the scale of the arc-shaped measuring scale 3. Figure 9 As shown, pointer 5 points to the scale of the arc-shaped measuring scale 3 at 130mm, so the circumference of the rolled circle formed by the adjustment plate 4 is 130mm. Generally, the wrist circumference of a person who can wear a watch is roughly between 130mm and 250mm, which can be the wrist or ankle. If this device is enlarged, it can also be used to measure the inner circle size of neckwear, such as necklaces, or other ring-shaped objects.

[0052] In some embodiments of this application, the device further includes a first connecting buckle 9, one end of the first adjusting rod 1 is connected to the adjusting plate 4 through the first connecting buckle 9; the first connecting buckle 9 has a first through hole, which, when the adjusting plate 4 is rolled into a circle, fixes the relative position of the overlapping parts of the adjusting plate 4 in the rolled-up state by passing the adjusting plate 4 through the first through hole.

[0053] To prevent the adjusting plate 4 from opening again after being rolled up, which would cause instability in its rolled-up shape, a first connecting buckle 9 is used to fix the two rolled-up and overlapping surfaces of the adjusting plate 4, thus stabilizing the rolled-up shape. After the first connecting buckle 9 is connected to the adjusting plate 4, when the adjusting plate 4 is rolled up, the portion of the adjusting plate 4 that comes into contact with the first connecting buckle 9 passes through the first through hole of the adjusting plate 4. In this way, the overlapping portions of the adjusting plate 4 are relatively fixed, which can prevent the adjusting plate 4 from opening on its own while in the rolled-up state, thus maintaining the rolled-up state of the adjusting plate 4.

[0054] In some embodiments of this application, when the adjusting plate 4 is rolled into a circle, the portion of the adjusting plate 4 that passes through the first through hole is located on the side away from the center point compared to the portion of the adjusting plate 4 that is connected to the first adjusting rod 1 via the first connecting buckle 9.

[0055] The first connecting buckle 9 not only connects the adjusting plate 4, but also allows part of the adjusting plate 4 to pass through the first connecting buckle 9 through the first through hole. When the adjusting plate 4 is rolled into a circle, the adjusting plate 4 partially overlaps. Compared to the center point, the part of the adjusting plate 4 that passes through the first through hole of the first connecting buckle 9 is farther from the center point than the part of the adjusting plate 4 that is connected to the first connecting buckle 9. That is, it is on the outer layer of the overlapping part of the rolled-up adjusting plate 4.

[0056] In some embodiments of this application, the device further includes a second connecting buckle 10, one end of the second adjusting rod 2 being connected to the adjusting plate 4 via the second connecting buckle 10; the second connecting buckle 10 has a second through hole for fixing the relative position of the overlapping portions of the adjusting plate 4 in the rolled state by passing the adjusting plate 4 through the second through hole when the adjusting plate 4 is rolled into a circle.

[0057] Similar to the function of the first connecting buckle 9, to prevent the adjusting plate 4 from opening again after being rolled up, thus causing instability in the rolled shape, a second connecting buckle 10 is used to fix the two rolled-up and overlapping surfaces of the adjusting plate 4, thereby stabilizing the rolled shape. After the second connecting buckle 10 is connected to the adjusting plate 4, when the adjusting plate 4 is rolled up, the portion of the adjusting plate 4 that comes into contact with the second connecting buckle 10 passes through the second through hole of the adjusting plate 4. In this way, the overlapping portions of the adjusting plate 4 are relatively fixed, which can prevent the adjusting plate 4 from opening on its own in the rolled state, thus maintaining the rolled state of the adjusting plate 4. The first connecting buckle 9 and the second connecting buckle 10 can be used simultaneously to make the rolled state of the adjusting plate 4 more stable.

[0058] In some embodiments of this application, when the adjusting plate 4 is rolled into a circle, the portion of the adjusting plate 4 that passes through the second through hole is located closer to the center point than the portion of the adjusting plate 4 that is connected to the second adjusting rod 2 via the second connecting buckle 10.

[0059] The second connecting buckle 10 not only connects the adjusting plate 4, but also allows part of the adjusting plate 4 to pass through the second connecting buckle 10 through the second through hole. When the adjusting plate 4 is rolled into a circle, the adjusting plate 4 partially overlaps. Compared to the center point, the part of the adjusting plate 4 that passes through the second through hole of the second connecting buckle 10 is farther from the center point than the part of the adjusting plate 4 connected to the second connecting buckle 10, that is, in the inner layer of the overlapping part of the rolled-up adjusting plate 4.

[0060] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

[0061] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be embraced within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims. Furthermore, it is clear that the word "comprising" does not exclude other units or steps, and the singular does not exclude the plural. Multiple units or devices recited in the apparatus claims may also be implemented by a single unit or device in software or hardware. The terms "first," "second," etc., are used to indicate names and do not indicate any particular order.

Claims

1. A length measuring device for measuring the inner circumference of an object to be measured, characterized in that, The device includes: First adjusting lever, second adjusting lever, arc-shaped measuring scale, adjusting plate, pointer; The first adjusting rod is hinged to the second adjusting rod, the arc-shaped measuring scale is fixed to the second adjusting rod, the pointer is fixed to the first adjusting rod and points to the scale of the arc-shaped measuring scale, and rotates with the first adjusting rod. The hinge point between the first adjusting rod and the second adjusting rod is located at the center point of the arc-shaped measuring scale. The adjusting plate forms a rolled circle, which rolls both the first adjusting rod and the second adjusting rod into the rolled circle. One end of the first adjusting rod and one end of the second adjusting rod are respectively connected to the adjusting plate. When it is necessary to test the inner circumference of the item to be tested, the rolled circle is placed into the inner circle of the item to be tested, and the relative positions of the first adjusting rod and the second adjusting rod are adjusted to change the circumference of the rolled circle until the adjusting plate abuts against the inner surface of the item to be tested. The device further includes a first adjusting part, a second adjusting part, a first connecting buckle, and a second connecting buckle. The first adjusting part is fixedly connected to the first adjusting rod to control the rotation of the first adjusting rod. The first adjusting part is perpendicular to the circular cross-section of the adjusting plate and extends beyond the circle formed by the adjusting plate. The second adjusting part is fixedly connected to the second adjusting rod to assist the first adjusting part in controlling the rotation of the first adjusting rod. One end of the first adjusting rod is connected to the adjusting plate through the first connecting buckle. The first connecting buckle has a first through hole for fixing the relative position of the overlapping parts of the adjusting plate in the rolled state by passing the adjusting plate through the first through hole when the adjusting plate is rolled. One end of the second adjusting rod is connected to the adjusting plate through the second connecting buckle. The second connecting buckle has a second through hole for fixing the relative position of the overlapping parts of the adjusting plate in the rolled state by passing the adjusting plate through the second through hole when the adjusting plate is rolled.

2. The apparatus according to claim 1, characterized in that, The device further includes: The pointer has a screw portion for engaging with the nut to secure it to the first adjusting rod.

3. The apparatus according to claim 1, characterized in that, When the circumference of the circle formed by the adjusting plate changes, the circumference of the circle formed by the adjusting plate is equal to the data represented by the scale on the arc-shaped ruler pointed to by the pointer.

4. The apparatus according to claim 1, characterized in that, When the adjusting plates are rolled into a circle, the portion of the adjusting plates that overlaps through the first perforation is located on the side furthest from the center point compared to the portion of the adjusting plates that is connected to the first adjusting rod via the first connecting buckle.

5. The apparatus according to claim 1, characterized in that, When the adjusting plates are rolled into a circle, the portion of the adjusting plates that overlaps with the second through hole is located closer to the center point than the portion of the adjusting plates that is connected to the second adjusting rod via the second connecting buckle.

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