A tape measure

Abstract

The application relates to the field of measuring tools, in particular to a tape measure which comprises a shell, a tape and a clockwork installed in the shell, one end of the tape is connected with the clockwork, a damping structure is further arranged in the shell, the damping structure comprises a rolling assembly and a pressure applying assembly, the rolling assembly comprises a rotating roller which is rotationally connected to the shell and abuts against the side surface of the tape, the tape movement can drive the rotating roller to rotate, and the pressure applying assembly is used for applying a force to the rotating roller to prevent the rotating roller from rotating. The application has the effects of slowing down the recovery speed of the tape of the tape measure, reducing the bending phenomenon of the tape in the recovery process and prolonging the service life of the tape measure.

Description

Technical Field

[0001] This application relates to the technical field of measuring tools, and in particular to a measuring tape. Background Technology

[0002] A measuring tape is a common measuring tool used in daily life, mainly for measuring the dimensions of objects.

[0003] A measuring tape mainly consists of a casing, a mainspring, and a measuring strip. The mainspring is coiled inside the casing and fixedly connected to it at one end. The measuring strip is wound around the mainspring and connected to one end of the mainspring. Applying tension to one end of the measuring strip unfolds it, allowing for measurement. When the tension is released, the elastic force of the mainspring causes the measuring strip to automatically retract back into the casing.

[0004] Measuring tape strips come in various lengths, such as 3m, 5m, and 10m. During use, when the strip is extended to a longer length, the spring stores a greater amount of elastic potential energy, which can cause the strip to bend during retraction, affecting the lifespan of the measuring tape. Summary of the Invention

[0005] In order to reduce bending during the tape measure recycling process and improve the service life of the tape measure, this application provides a tape measure.

[0006] The measuring tape provided in this application adopts the following technical solution: A measuring tape includes a housing and a measuring strip and a spring installed inside the housing. One end of the measuring strip is connected to the spring. The housing also has a damping structure, which includes a rolling component and a pressure component. The rolling component includes a rotating roller, which is rotatably connected to the housing and has its side abutting against the side of the measuring strip. Movement of the measuring strip can drive the rotating roller to rotate. The pressure component is used to apply a force to the rotating roller to resist its rotation.

[0007] By adopting the above technical solution, the rotating roller is rotatably connected to the outer casing, and the movement of the ruler strip drives the rotating roller to rotate. When the pressure application component applies a force to the rotating roller to resist its rotation, the resistance is transmitted to the ruler strip through the rotating roller, thereby slowing down the sliding of the ruler strip and reducing the occurrence of ruler strip bending due to excessive retraction speed, thus improving the service life of the measuring tape. At the same time, because the rotating roller rolls in close contact with the ruler strip, it can reduce the phenomenon of the scale lines on the ruler strip being erased due to sliding friction between the rotating roller and the ruler strip.

[0008] Optionally, two rotating rollers are provided, with the two rotating rollers respectively located on both sides of the ruler strip.

[0009] By adopting the above technical solution, the two rotating rollers clamp the ruler strip, reducing the slippage between the rotating rollers and the ruler strip, and further reducing the wear of the scale lines on the ruler strip surface.

[0010] Optionally, a one-way transmission assembly is provided between the pressure application assembly and the rotating roller. The one-way transmission assembly includes a ratchet, a pawl, and an elastic plate. The ratchet is rotatably connected to the housing, and the pawl is rotatably connected to the rotating roller and engages with the ratchet. The elastic plate is used to keep the pawl tending to rotate towards the ratchet. The direction of movement during the unfolding of the ruler strip is defined as a first direction, and the opposite direction is defined as a second direction. When the ruler strip moves along the second direction, the ratchet engages with the pawl; when the ruler strip moves along the first direction, the pawl disengages from the ratchet. The pressure application assembly is used to apply a force to the ratchet to prevent it from rotating.

[0011] By adopting the above technical solution, during the tape measure retrieval process, the rotating roller is driven to rotate, which in turn drives the ratchet to rotate. The pressure application component applies resistance to the ratchet, thereby slowing down the tape measure's movement speed. When the tape measure moves in the first direction, the pawl disengages from the ratchet, so the resistance applied by the pressure application component to the ratchet cannot be transmitted to the rotating roller, thus not affecting the operator's ability to unfold the tape measure for measurement.

[0012] Optionally, the outer casing is provided with a fixed shaft, the end of the rotating roller is provided with a rotating groove, the fixed shaft is coaxially arranged with the rotating roller, and one end is inserted into the rotating groove and rotatably connected to the rotating roller. The ratchet is sleeved on the fixed shaft and located in the rotating groove.

[0013] By adopting the above technical solution, a rotating connection is achieved between the rotating roller and the outer shell via a fixed shaft, as well as a rotating connection between the ratchet and the outer shell. Furthermore, a rotating groove is provided on the rotating roller, allowing the ratchet to reside within the groove, effectively utilizing space and reducing product volume.

[0014] Optionally, the pressure-applying assembly includes a friction plate and an elastic element. The friction plate is slidably connected to the housing, and sliding the friction plate allows it to move closer to or away from the ratchet. The elastic element is mounted on the housing to maintain the friction plate in a force that moves it closer to the ratchet.

[0015] By adopting the above technical solution, the friction plate is pressed against the ratchet by the elastic element, thereby generating friction between the friction plate and the ratchet to block the ratchet from rotating, thus slowing down the movement speed of the ruler.

[0016] Optionally, the housing is further provided with an adjustment assembly, the adjustment assembly including an adjustment plate, the elastic element being compressible in a direction parallel to the sliding direction of the friction plate, the adjustment plate being slidably connected to the housing in a direction parallel to the compression direction of the elastic element, and the elastic element being located between the friction plate and the adjustment plate.

[0017] By adopting the above technical solution, sliding the adjusting plate closer to the ratchet allows for further compression of the elastic element, thereby causing the friction plate to press further against the ratchet and increasing the frictional force between the friction plate and the ratchet. During the ruler retrieval process, the position of the adjusting plate can be adjusted to change the frictional force between the friction plate and the ratchet, facilitating the application of different levels of resistance to rulers at different retrieval speeds.

[0018] Optionally, multiple sets of pressure-applying components are arranged along the circumference of the ratchet, and multiple adjustment plates are arranged corresponding to the multiple sets of pressure-applying components.

[0019] By adopting the above technical solution, multiple pressure-applying components simultaneously apply resistance to the ratchet, thereby improving the effect of slowing down the movement of the ruler.

[0020] Optionally, the adjustment assembly includes an adjustment block, which is slidably connected to the housing along the axial direction of the ratchet. Multiple adjustment plates are connected to the adjustment block, and sliding the adjustment block can drive the multiple adjustment plates to move.

[0021] By adopting the above technical solution, multiple adjusting plates abut against the adjusting block, and the adjusting block drives multiple adjusting plates to move simultaneously, making it convenient for staff to adjust the compression degree of multiple elastic elements.

[0022] Optionally, the housing is provided with a drive assembly, which includes two rotating rings and two rotating rods. The two rotating rings are spaced apart on one side of the adjusting block along the sliding direction of the adjusting block, and the rotating rings are rotatable about the rotation axis of the ratchet. The two rotating rods are respectively connected to the two rotating rings, and the ends of the two rotating rods away from the rotating rings are rotatably connected to each other. One of the rotating rings can slide in a direction parallel to the sliding direction of the adjusting block. The sliding rotating ring is defined as the first rotating ring, and the other rotating ring is defined as the second rotating ring. The first rotating ring is connected to the adjusting block, and the second rotating ring is connected to the ratchet. The sliding direction of the adjusting block when it drives the adjusting plate closer to the friction plate is defined as the pressure direction. When the first rotating ring approaches the other rotating ring, it can drive the adjusting block to move along the pressure direction.

[0023] By adopting the above technical solution, when the ratchet rotates, it drives the rotating ring to rotate, and the rotating ring drives the rotating rod to rotate. During the rotation of the rotating rod around the axis of rotation of the rotating ring, the rotating rod itself generates centrifugal force, causing the end away from the rotating ring to rotate in a direction away from the rotating ring, thereby driving the first rotating ring to slide. During the strip retraction process, the speed of the ratchet is proportional to the sliding distance of the first rotating ring. Therefore, when the ratchet speed increases, the first rotating ring drives the adjusting block to move through the linkage, which in turn drives the adjusting plate to further compress the elastic element, increasing the friction between the friction plate and the ratchet, thereby achieving automatic adjustment of the friction between the ratchet and the friction plate.

[0024] Optionally, the drive assembly may also include a counterweight connected to the end of the rotating rod away from the rotating ring.

[0025] By adopting the above technical solution, the centrifugal force at the end of the rotating rod furthest from the rotating ring is increased by using a counterweight, thereby improving the sensitivity of the drive assembly in moving the adjusting block. In summary, this application includes the following beneficial technical effects: During use, when the measuring tape is pulled, the tape moves in the first direction. At this time, the ratchet and pawl separate, and the friction between the abutment plate and the ratchet cannot be transmitted to the rotating roller, thus not hindering the tape's movement in the first direction. When the tape moves in the second direction under the pull of the spring, it drives the ratchet to rotate. The resistance between the abutment plate and the ratchet is transmitted to the tape, which slows down the tape's retraction speed, reduces tape bending, and extends the tape's service life. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application.

[0027] Figure 2 This is a schematic diagram of the damping structure according to an embodiment of this application.

[0028] Figure 3 This is a partial cross-sectional schematic diagram of the damping structure according to an embodiment of this application.

[0029] Figure 4 This is a schematic diagram of the structure of a one-way transmission component according to an embodiment of this application.

[0030] Reference numerals: 1. Outer shell; 11. Ruler strip; 2. Damping structure; 3. Rolling assembly; 31. Rotating roller; 32. Fitting groove; 4. Fixed shaft; 41. Rotating groove; 5. Pressing assembly; 51. Friction plate; 52. Telescopic component; 53. Elastic component; 6. One-way transmission assembly; 61. Ratchet; 62. Pad; 63. Elastic plate; 64. Connecting ring; 7. Adjusting assembly; 71. Adjusting plate; 72. Adjusting block; 73. Driving ramp; 8. Driving assembly; 81. Rotating ring; 82. Rotating rod; 83. Connecting component; 831. Fixed ring; 832. Guide post; 84. Linkage component; 841. Sliding rod; 842. Connecting rod; 85. Counterweight. Detailed Implementation

[0031] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0032] This application discloses a measuring tape.

[0033] Reference Figure 1 A measuring tape includes a housing 1 and a measuring strip 11. A spring is housed inside the housing 1. One end of the measuring strip 11 is fixedly connected to the end of the spring, and the other end extends outside the housing 1 to facilitate pulling the measuring strip 11. A damping structure 2 is also provided inside the housing 1, located near the measuring strip 11. For ease of description, the direction of movement of the measuring strip 11 when pulled out from inside the housing 1 is defined as the first direction, and the direction opposite to the first direction is defined as the second direction. The damping structure 2 applies a force opposite to the second direction to the end of the measuring strip 11 when it moves along the second direction. This slows down the movement speed of the measuring strip 11 when the elastic potential energy of the spring is too high, reduces the bending phenomenon of the measuring strip 11, and thus improves the service life of the measuring tape.

[0034] Reference Figure 1 and Figure 2The damping structure 2 includes a rolling assembly 3, a pressure-applying assembly 5, and a one-way transmission assembly 6. The rolling assembly 3 includes two rotating rollers 31, which are respectively disposed on both sides of the ruler strip 11 along its thickness direction and rotatably connected to the outer casing 1 around their own axes. The two rotating rollers 31 abut against both sides of the ruler strip 11, and the movement of the ruler strip 11 drives the rotating rollers 31 to rotate. The pressure-applying assembly 5 is mounted on the outer casing 1, and the one-way transmission assembly 6 is located between the pressure-applying assembly 5 and the rotating rollers 31, used to control the disconnection and connection between the pressure-applying assembly 5 and the rotating rollers 31. The pressure-applying assembly 5 applies resistance to the rotation of the rotating rollers 31, and the one-way transmission assembly 6 controls the connection between the pressure-applying assembly 5 and the rotating rollers 31. When the ruler strip 11 moves along the second direction, the one-way transmission assembly 6 controls the connection between the pressure-applying assembly 5 and the rotating rollers 31, thereby increasing the resistance to the rotation of the rotating rollers 31 and thus slowing down the movement speed of the ruler strip 11. When the ruler strip 11 moves along the first direction, the one-way transmission component 6 disconnects the connection between the pressure application component 5 and the rotating roller 31, thereby making it easier for the staff to pull out the ruler strip 11.

[0035] Reference Figure 1 and Figure 2 The rotating roller 31 has a fitting groove 32 on its side, which matches the ruler strip 11. The two sides of the ruler strip 11 respectively fit into the sides of the fitting grooves 32 on the two rotating rollers 31 to reduce slippage between the rotating roller 31 and the ruler strip 11. To further reduce slippage between the rotating roller 31 and the ruler strip 11, a rubber ring (not shown in the figure) can be fitted on the rotating roller 31.

[0036] Reference Figure 1 and Figure 2 A fixed shaft 4 is provided on the outer shell 1. The fixed shaft 4 is arranged on one side of the rotating roller 31 along the length direction of the rotating roller 31 and is fixedly connected to the outer shell 1. A rotating groove 41 is opened on the end face of the rotating roller 31 corresponding to the fixed shaft 4. The end of the fixed shaft 4 near the rotating roller 31 is inserted into the rotating groove 41 and rotatably connected to the rotating roller 31, so as to realize the fixed connection between the rotating roller 31 and the outer shell 1.

[0037] Reference Figure 2 and Figure 3 The one-way transmission component 6 is located inside the rotating groove 41. Combined with... Figure 4The one-way transmission assembly 6 includes a ratchet 61, a pawl 62, and an elastic plate 63. The ratchet 61 is coaxially arranged with and rotatably connected to the fixed shaft 4. The pawl 62 is rotatably connected to the side wall of the rotating groove 41, and rotating the pawl 62 allows one end of the pawl 62 to engage with the ratchet 62. The elastic plate 63 is mounted on the rotating roller 31 and is used to keep the pawl 62 rotating towards the ratchet 61. In this embodiment, the elastic plate 63 is an elastic metal plate, with one side welded to the side wall of the rotating groove 41 and the other side abutting against the pawl 62. A connecting ring 64 is provided on one side of the ratchet 61. The connecting ring 64 is rotatably sleeved on the fixed shaft 4, and the ratchet 61 is welded to the connecting ring 64, realizing the rotational connection between the ratchet 61 and the fixed shaft 4.

[0038] Reference Figure 2 and Figure 3 The pressure-applying component 5 applies resistance to the rotation of the ratchet 61. When the ruler 11 moves in the first direction, the pawl 62, under the action of the ratchet 61, can overcome the elastic force of the elastic plate 63 and separate from the ratchet 61, thereby breaking the transmission of frictional force between the pressure-applying component 5 and the rotating roller 31. When the ruler 11 moves in the second direction, the pawl 62 engages in the ratchet 61, driving the ratchet 61 to rotate. At this time, the resistance applied by the pressure-applying component 5 to the ratchet 61 can be transmitted to the rotating roller 31.

[0039] Reference Figure 2 and Figure 3 The pressure-applying assembly 5 includes a friction plate 51, with a gap between the inner wall of the ratchet 61 and the side wall of the fixed shaft 4. The friction plate 51 is located between the ratchet 61 and the fixed shaft 4, and is slidably connected to the fixed shaft 4 radially. The sliding friction plate 51 can press against the inner wall of the ratchet 61, applying rotational resistance to the ratchet 61.

[0040] Reference Figure 2 and Figure 3 The pressure application component 5 also includes a telescopic member 52, which includes a fixed rod and a sliding sleeve. One end of the fixed rod is welded to the fixed shaft 4, and the other end extends radially away from the fixed shaft 4. One end of the sliding sleeve is slidably fitted onto the fixed rod, and the other end is welded to the friction plate 51, thereby realizing a sliding connection between the friction plate 51 and the fixed shaft 4.

[0041] Reference Figure 2 and Figure 3 The pressure application component 5 also includes an elastic element 53, which is used to maintain the friction plate 51 in a direction away from the fixed shaft 4. In this embodiment, the elastic element 53 is a spring, which is sleeved on the fixed rod, with one end abutting against the sliding sleeve and the other end connected to the fixed shaft 4. Under the action of the elastic element 53, the friction plate 51 abuts against the inner wall of the ratchet 61 and maintains a certain pressure, thereby enabling a certain frictional force between the ratchet 61 and the friction plate 51.

[0042] Reference Figure 2 and Figure 3 In order to increase the resistance during the rotation of the ratchet 61, the pressure application component 5 can be evenly spaced in multiple sets around the axis of the fixed shaft 4. In this embodiment, it is set to 3 sets.

[0043] Reference Figure 2 and Figure 3 The damping structure 2 also includes an adjustment assembly 7, which includes an adjustment plate 71. Multiple adjustment plates 71 are configured corresponding to the pressure application assembly 5. The adjustment plate 71 is located between the elastic member 53 and the fixed shaft 4, and a through hole is provided on the adjustment plate 71 corresponding to the position of the fixed rod. The adjustment plate 71 is slidably sleeved on the fixed rod along its length. One end of the elastic member 53 near the fixed shaft 4 abuts against the adjustment plate 71. Moving the adjustment plate 71 can change the degree of compression of the elastic member 53, thereby adjusting the friction force between the friction plate 51 and the ratchet 61.

[0044] Reference Figure 2 and Figure 3 The adjusting assembly 7 also includes an adjusting block 72, which has a cylindrical structure and is slidably mounted on the fixed shaft 4 along its length. A driving inclined surface 73 is provided on the side of the adjusting block 72 near the adjusting plate 71. The driving inclined surface 73 slopes along the length of the fixed shaft 4 from the side near the adjusting plate 71 to the side away from the adjusting plate 71, moving away from its own axis. The side of the adjusting plate 71 near the adjusting block 72 abuts against the driving inclined surface 73. Sliding the adjusting block 72 towards the adjusting plate 71, under the action of the driving inclined surface 73, can drive multiple adjusting plates 71 to move synchronously away from the fixed shaft 4, achieving synchronous adjustment of multiple adjusting plates 71.

[0045] Reference Figure 2 and Figure 3 A drive assembly 8 is also provided on the fixed shaft 4. The drive assembly 8 includes two rotating rings 81 and two rotating rods 82. The rotating rings 81 are circular rings, and the two rotating rings 81 are spaced apart along the length of the fixed shaft 4 and are coaxially rotatably sleeved on the fixed shaft 4. The two rotating rods 82 are respectively rotatably connected to the two rotating rings 81, and at the same time, the ends of the two rotating rods 82 away from the rotating rings 81 are rotatably connected to each other.

[0046] Reference Figure 2 and Figure 3One of the rotating rings 81 can slide along the length of the fixed shaft 4. For ease of description, the sliding rotating ring 81 is defined as the first rotating ring, and the other rotating ring 81 is defined as the second rotating ring. A linkage 84 is provided between the first rotating ring and the adjusting block 72. The linkage 84 is used to connect the first rotating ring and the adjusting block 72 so that when the first rotating ring approaches the second rotating ring, it can drive the adjusting block 72 to move along the pressure direction (in this embodiment, the pressure direction refers to the direction of movement when the adjusting block 72 drives multiple adjusting plates 71 to approach the friction plate 51). A connector 83 is provided between the rotating ring 81 and the ratchet 61. The connector 83 is used to connect the ratchet 61 and the rotating ring 81 so that the ratchet 61 can drive the rotating ring 81 to rotate synchronously. During the retraction of the ruler 11, the rotating ring 81 rotates with the ratchet 61. Since the centrifugal force of the rotating rod 82 is different at different speeds, the moving distance of the first rotating ring is also different, thereby automatically adjusting the position of the adjusting block 72, and thus automatically adjusting the resistance applied by the friction plate 51 to the ratchet 61.

[0047] Reference Figure 2 and Figure 3 In this embodiment, the drive assembly 8 and the adjusting plate 71 are located on the same side of the adjusting block 72. The connecting member 83 includes a fixing ring 831 and a guide post 832. The fixing ring 831 is sleeved on the outside of the fixing shaft 4 and welded to the ratchet 61. One end of the guide post 832 is welded to the fixing ring 831, and the other end extends along the sliding direction of the first rotating ring and passes through both rotating rings 81 at once, so that when the ratchet 61 rotates, it can drive the two rotating rings 81 to rotate.

[0048] Reference Figure 2 and Figure 3 The linkage 84 includes a sliding rod 841 and a connecting rod 842. The sliding rod 841 is slidably connected inside the fixed shaft 4 in a direction parallel to the fixed shaft 4. Two connecting rods 842 are provided, corresponding to the first rotating ring and the adjusting block 72, respectively. Annular grooves are formed on the inner walls of the first rotating ring and the adjusting block 72 at positions corresponding to the connecting rods 842. One end of the connecting rod 842 is welded to the sliding rod 841, and the other end extends radially along the fixed shaft 4 and is inserted into the annular groove. The connecting rod 842 is within the annular groove and can slide circumferentially along the annular groove, thereby realizing the connection between the first rotating ring and the adjusting block 72.

[0049] Reference Figure 2 and Figure 3 The drive assembly 8 also includes a counterweight 85, which is rotatably connected to the end of the rotating rod 82 away from the rotating ring 81. The counterweight 85 increases the centrifugal force at the end of the rotating rod 82 away from the rotating ring 81 during the rotation of the rotating ring 81, thereby improving the sensitivity of the drive assembly 8 in driving the adjustment block 72.

[0050] Reference Figure 2 and Figure 3 To improve the stability of the rotating ring 81 during rotation, the rotating rods 82 can be evenly spaced in groups along the circumference of the rotating ring 81; in this embodiment, four groups are provided. The arrangement of multiple groups of rotating rods 82 makes the force on the rotating ring 81 more balanced during rotation, thereby improving the stability of the rotating ring 81 during rotation. At the same time, the arrangement of multiple groups of rotating rods 82 can further improve the sensitivity of the first rotating ring in moving the adjusting block 72.

[0051] The implementation principle of a measuring tape according to an embodiment of this application is as follows: During the tape retraction process, the tape strip 11 drives the ratchet 61 to rotate, which in turn drives the rotating ring 81 to rotate. Under the action of centrifugal force, the rotating rod 82 drives the first rotating ring to move closer to the second rotating ring. Under the action of the linkage 84, the adjusting block 72 can be driven to move closer to the adjusting plate 71, thereby further compressing the elastic element 53, increasing the friction between the friction plate 51 and the ratchet 61, and achieving the effect of slowing down the retraction speed of the tape strip 11.

[0052] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A measuring tape, comprising a housing (1) and a measuring strip (11) and a spring installed inside the housing (1), one end of the measuring strip (11) being connected to the spring, characterized in that: The outer shell (1) is also provided with a damping structure (2), which includes a rolling assembly (3) and a pressure application assembly (5). The rolling assembly (3) includes a rotating roller (31), which is rotatably connected to the outer shell (1). The side of the rotating roller (31) abuts against the side of the ruler strip (11). The movement of the ruler strip (11) can drive the rotating roller (31) to rotate. The pressure application assembly (5) is used to apply a force to the rotating roller (31) to block the rotation of the rotating roller (31). The rotating roller (31) is configured as two, and the two rotating rollers (31) are respectively arranged on both sides of the ruler strip (11); A one-way transmission assembly (6) is provided between the pressure application assembly (5) and the rotating roller (31). The one-way transmission assembly (6) includes a ratchet (61), a pawl (62), and an elastic plate (63). The ratchet (61) is rotatably connected to the housing (1). The pawl (62) is rotatably connected to the rotating roller (31) and engages with the ratchet (61). The elastic plate (63) is used to keep the pawl (62) rotating towards the ratchet (61). The direction of movement of the ruler (11) during its unfolding process is defined as the first direction, and the opposite direction is defined as the second direction. When the ruler (11) moves along the second direction, the ratchet (61) engages with the pawl (62); when the ruler (11) moves along the first direction, the pawl (62) disengages from the ratchet (61); the pressure application component (5) is used to apply a force to the ratchet (61) to prevent the ratchet (61) from rotating. The pressure application assembly (5) includes a friction plate (51) and an elastic element (53). The friction plate (51) is slidably connected to the housing (1). Sliding the friction plate (51) can move the friction plate (51) closer to or away from the ratchet (61). The elastic element (53) is mounted on the housing (1) to maintain the friction plate (51) in a direction closer to the ratchet (61) with a force. An adjustment assembly (7) is also provided on the outer shell (1). The adjustment assembly (7) includes an adjustment plate (71). The elastic element (53) can be compressed in a direction parallel to the sliding direction of the friction plate (51). The adjustment plate (71) is slidably connected to the outer shell (1) in a direction parallel to the compression direction of the elastic element (53). The elastic element (53) is located between the friction plate (51) and the adjustment plate (71).

2. A measuring tape according to claim 1, characterized in that: The outer casing (1) is provided with a fixed shaft (4), and the end of the rotating roller (31) is provided with a rotating groove (41). The fixed shaft (4) is coaxially arranged with the rotating roller (31), and one end is inserted into the rotating groove (41) and rotatably connected to the rotating roller (31). The ratchet (61) is sleeved on the fixed shaft (4) and located in the rotating groove (41).

3. A measuring tape according to claim 1, characterized in that: Multiple sets of pressure application components (5) are arranged circumferentially along the ratchet (61), and multiple sets of adjustment plates (71) are arranged corresponding to the multiple sets of pressure application components (5).

4. A measuring tape according to claim 3, characterized in that: The adjustment component (7) includes an adjustment block (72), which is slidably connected to the housing (1) along the axial direction of the ratchet (61). Multiple adjustment plates (71) are connected to the adjustment block (72). Sliding the adjustment block (72) can drive the multiple adjustment plates (71) to move.

5. A measuring tape according to claim 4, characterized in that: A drive assembly (8) is provided on the outer casing (1). The drive assembly (8) includes two rotating rings (81) and two rotating rods (82). The two rotating rings (81) are spaced apart on one side of the adjusting block (72) along the sliding direction of the adjusting block (72), and the rotating rings (81) can rotate about the rotation axis of the ratchet (61). The two rotating rods (82) are respectively connected to the two rotating rings (81), and the ends of the two rotating rods (82) away from the rotating rings (81) are rotatably connected to each other. One of the rotating rings (81) can rotate along a parallel... The sliding direction of the adjusting block (72) is defined as the first rotating ring (81) that can slide, and the other rotating ring (81) is defined as the second rotating ring (81); the first rotating ring (81) is connected to the adjusting block (72), and the second rotating ring (81) is connected to the ratchet (61); the sliding direction of the adjusting block (72) driving the adjusting plate (71) to approach the friction plate (51) is defined as the pressure direction, and when the first rotating ring (81) approaches the other rotating ring (81), it can drive the adjusting block (72) to move along the pressure direction.

6. A measuring tape according to claim 5, characterized in that: The drive assembly (8) also includes a counterweight (85) connected to the end of the rotating rod (82) away from the rotating ring (81).

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