Measuring tape with self-locking brake structure

Abstract

The utility model relates to a measuring tape with a self-locking brake structure, the measuring tape comprises a housing and a tape band which can be pulled out from the housing, the self-locking brake structure comprises a button, and a movable support, a brake member, a reset spring and a fixed block which are arranged in the housing; the key can be movably arranged on the shell in a penetrating manner between a self-locking position and a releasing position; the movable support is rotationally connected to the shell, one side of the movable support abuts against the inner side of the key, and the brake piece is clamped to the movable support. The fixed block is fixedly connected to the shell and located between the key and the movable support, and the reset spring abuts against the position between the fixed block and the brake piece. The key moves between the self-locking position and the releasing position to drive the movable support and the reset spring to move, and correspondingly the brake piece abuts against the ruler belt to generate friction or is separated from the ruler belt. The self-locking brake structure has the advantages that short-distance self-locking and releasing can be achieved by combining the movable support, the reset spring and the brake piece, the stroke is reduced, and therefore the self-locking brake structure is smaller in occupied space.

Description

Technical Field

[0001] This utility model relates to the field of measuring equipment technology, and in particular to a measuring tape with a self-locking brake structure. Background Technology

[0002] A measuring tape is a tool for measuring length. It has a structure that fixes the length and position of the tape when it is pulled out during use, preventing the tape from automatically retracting and ensuring the accuracy and safety of the measurement. This structure is called a tape self-locking brake structure.

[0003] In existing technologies, most measuring tapes are circular or square in structure, with their self-locking brake mechanism located at the tape exit and linked by a linkage. However, this structure is unsuitable for rectangular measuring tapes, especially handheld multi-functional measuring devices with laser rangefinders. Due to their small size and limited internal space, traditional linkage structures are not applicable. Furthermore, because of their slender shape, placing the self-locking brake mechanism at the tape exit would be inconvenient to operate and would affect the overall aesthetics.

[0004] Therefore, there is an urgent need for a tape measure with a self-locking brake structure suitable for such small tape measures with limited internal space. Utility Model Content

[0005] (a) Technical problems to be solved

[0006] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a tape measure with a self-locking brake structure that is suitable for tape measures with small size and limited internal space, which solves the technical problem that the prior art is not suitable for tape measures with small size and limited internal space.

[0007] (II) Technical Solution

[0008] In order to achieve the above-mentioned purpose, the main technical solutions adopted by this utility model include:

[0009] This utility model provides a measuring tape with a self-locking brake structure, including a housing and a tape that can be pulled out from the housing. The self-locking brake structure includes a button and a movable bracket, a brake component, a return spring, and a fixing block located inside the housing. The button is movably mounted on the housing between a self-locking position and a release position. The movable bracket is rotatably connected to the housing, with one side of the movable bracket abutting against the inner side of the button, and the brake component is engaged with the movable bracket. The fixing block is fixedly connected to the housing and located between the button and the movable bracket, and the return spring abuts against the fixing block and the brake component. The movement of the button between the self-locking position and the release position drives the movable bracket and the return spring to move, thereby causing the brake component to abut against the tape and rub against it or disengage from the tape.

[0010] Optionally, during the process of pressing down the button to move it from the self-locking position to the release position, the movable bracket drives the brake component away from the tape until it disengages from it, and the brake component drives the return spring to store energy; when the button is released, the return force of the return spring drives the movable bracket to move the brake component toward the tape until it comes into contact with it and friction occurs, and at the same time the movable bracket pushes the button from the release position to the self-locking position; wherein, the movement direction of the button is opposite to the movement direction of the brake component, and both are perpendicular to the extension direction of the tape.

[0011] Optionally, the movable bracket includes a first movable block and a second movable block; the first movable block and the second movable block are symmetrically arranged relative to the brake component and their opposite ends abut against the inner ends of the button; the first movable block and the second movable block are provided with the same semi-circular holes that surround each other to form a circular hole to engage the brake component; when the button is in the release position, the button presses down on the opposite ends of the first movable block and the second movable block, and the opposite ends of the first movable block and the second movable block lift the brake component until it is disengaged from the tape.

[0012] Optionally, the brake component includes a fixed seat and a rubber pad. The fixed seat is located inside the circular hole, and a convex ring is provided at one end of the fixed seat adjacent to the return spring. The convex ring is constructed as a circular ring with a diameter larger than the circular hole. The rubber pad is fixedly connected to the fixed seat and partially extends out of the fixed seat. When the button is pressed down to move it from the self-locking position to the release position, the button pushes the opposite ends of the first and second movable blocks to move. The opposite ends of the first and second movable blocks move towards the button, pushing the convex ring of the brake component to move towards the button. The brake component then moves towards the button and compresses the return spring to store energy, and the rubber pad disengages from the measuring tape. When the button is released, the return force of the return spring pushes the fixed seat of the brake component. The brake component moves towards the measuring tape until it abuts against the rubber pad and causes friction. At the same time, the convex ring of the brake component pushes the opposite ends of the first and second movable blocks towards the measuring tape. The first and second movable blocks rotate, and their opposite ends push the button away from the measuring tape. The button moves from the release position to the self-locking position.

[0013] Optionally, the first movable block and the second movable block are rotatably supported on the housing at their respective midpoints via a pivot; the housing is provided with a pivot connection hole for fixed connection, located at both ends of the pivot hole positions of the first movable block and the second movable block, respectively, and the pivot is interference-fitted with the pivot connection hole, so that the first movable block and the second movable block can rotate around the pivot.

[0014] Optionally, the brake component is provided with an adhesive component, which is a cylindrical structure with adhesive layers on both sides. The mounting base also includes a rubber pad mounting groove. One end of the adhesive component is glued to the rubber pad mounting groove, and the other end is glued to the rubber pad.

[0015] Optionally, the top of the fixing base also includes an inwardly recessed cylindrical cavity, in which the return spring abuts, and the diameter of the cylindrical cavity is larger than that of the return spring.

[0016] Optionally, the button includes a button body and two connectors located on both sides of the button body. The connectors include a U-shaped arm and a T-shaped part. The two free ends of the U-shaped arm are fixedly connected to the button body. The bottom end of the T-shaped part is connected to the middle part of the U-shaped arm. A fixing member adapted to the T-shaped part is fixedly connected to the inner side of the housing. A space for the T-shaped part to move is formed between the fixing member and the housing. When the T-shaped part abuts against the fixing member, the button is in the released position.

[0017] Optionally, the fixing block is constructed as a mountain-shaped structure with outward protrusions on both sides and in the middle. The shape of the outward protrusion in the middle is a cuboid block adapted to the diameter of the return spring, and the return spring is sleeved on the cuboid block.

[0018] Optionally, the self-locking brake structure is provided in the area of ​​the belt adjacent to its pull-out port from the housing.

[0019] (III) Beneficial Effects

[0020] The beneficial effects of this utility model are:

[0021] This utility model discloses a measuring tape with a self-locking brake structure, comprising a housing and a tape that can be pulled out from the housing. The measuring tape also includes a button, a movable bracket, a brake, a return spring, and a fixing block located inside the housing. The button is movably mounted on the housing between a self-locking position and a release position. The movable bracket is rotatably connected to the housing, with one side abutting against the inner side of the button. The brake is engaged with the movable bracket. The fixing block is fixedly connected to the housing and located between the button and the movable bracket. The return spring abuts against the fixing block and the brake. Movement of the button between the self-locking and release positions drives the movable bracket and the return spring to move, causing the brake to rub against or disengage from the tape. Compared to existing technologies, the combination of the movable bracket, return spring, and brake allows for short-distance self-locking and release, reducing the stroke and thus making the self-locking brake structure occupy less space.

[0022] This brake structure has good balance. No matter where the button is pressed, the brake component can be easily separated from the tape. It can effectively prevent the brake component from being unable to be driven by the edges of the button, or from being stuck when pressing, which would require more force to separate the brake component from the tape. Attached Figure Description

[0023] Figure 1 This is a partial structural diagram of an embodiment of the measuring tape with a self-locking brake structure of the present invention, which includes the self-locking brake structure. Other parts of the measuring tape are not shown in order to clearly show the self-locking brake structure.

[0024] Figure 2 for Figure 1An exploded view of a measuring tape with a self-locking brake mechanism is shown from one perspective.

[0025] Figure 3 for Figure 1 A partial exploded view of a measuring tape with a self-locking brake mechanism from another perspective;

[0026] Figure 4 This is a schematic diagram of some parts of an embodiment of the measuring tape with a self-locking brake structure of this utility model;

[0027] Figure 5 This is a schematic diagram of an embodiment of the measuring tape with a self-locking brake structure according to the present invention.

[0028] [Explanation of Labels in the Attached Image]

[0029] 1: Shell;

[0030] 2: Measuring tape;

[0031] 3: Button; 31: Button body; 32: Connector;

[0032] 4: Movable bracket; 41: First movable block; 42: Second movable block; 43: Rotating shaft; 44: Shaft hole; 45: Rotating shaft connection hole;

[0033] 5: Brake component; 51: Mounting seat; 511: Raised ring; 512: Rubber pad mounting groove; 52: Rubber pad; 53: Adhesive component;

[0034] 6: Return spring;

[0035] 7: Fixed block; 71: Rectangular block;

[0036] 8: Fasteners. Detailed Implementation

[0037] To better explain and facilitate understanding of this utility model, the present utility model will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0038] Reference Figures 1 to 5 This embodiment provides a measuring tape with a self-locking brake structure to achieve self-locking and release of the measuring tape strip 2. Specifically, the measuring tape with a self-locking brake structure in this embodiment includes a housing 1 and a measuring tape 2 that can be pulled out from the housing 1. The measuring tape also includes a self-locking brake structure, which includes a button 3 and a movable bracket 4, a brake component 5, a return spring 6, and a fixing block 7 located inside the housing 1, as detailed below.

[0039] In this embodiment, a through hole is provided on one side of the housing 1. The button 3 is movably inserted through the through hole on the housing 1 between the self-locking position and the release position. The button 3 is constructed such that part of it is outside the housing 1 and part of it is inside the housing 1. When not in use, both ends of the button 3 abut against the inner wall of the housing 1 and the entire button 3 is in the self-locking position. When pressed down, both ends of the button 3 leave the inner wall of the housing 1 and the entire button 3 is in the release position.

[0040] The movable bracket 4 is rotatably connected to the housing 1, with one side of the movable bracket 4 abutting against the inner side of the button 3. The brake 5 is snapped onto the movable bracket 4. Driven by the button 3, the movable bracket 4 can rotate, thereby moving the brake 5. The fixing block 7 is fixedly connected to the housing 1 and located between the button 3 and the movable bracket 4. The fixing of the fixing block 7 includes, but is not limited to, bonding, welding, and integral molding. The return spring 6 abuts between the fixing block 7 and the brake 5. One end of the return spring 6 is fixed by the fixing block 7; therefore, the elastic force of the return spring 6 corresponds to the brake 5, and it can be compressed and stored by the brake 5, or it can drive the brake 5 to return to its original position.

[0041] Specifically, during the process of pressing button 3 to move it from the self-locking position to the release position, the movable bracket 4 drives the brake 5 away from the tape 2 until it disengages from it. The brake 5 drives the return spring 6 to store energy. When the pressure on button 3 is released, the return force of the return spring 6 drives the movable bracket 4 to move the brake 5 towards the tape 2 until it comes into contact with it and friction occurs. At the same time, the movable bracket 4 pushes button 3 from the release position to the self-locking position. The direction of movement of button 3 is opposite to the direction of movement of brake 5, and both are perpendicular to the extension direction of tape 2. That is, button 3 will only move downward under external force. When button 3 moves downward, button 3 presses the movable bracket 4, and the movable bracket 4 drives the brake 5 to move outward. At this time, the return spring 6 is compressed, causing the return spring 6 to deform to a certain extent. The return spring 6 accumulates a certain amount of elastic potential energy and will release elastic force in the opposite direction. When the external force disappears, the return spring 6 compresses the brake 5 and moves it downward, thereby driving the movable bracket 4 to move outward. The movable bracket 4 compresses button 3 outward, at which point button 3 returns to the self-locking position.

[0042] Therefore, the movement of button 3 between the self-locking position and the release position drives the movable bracket 4 and the return spring 6 to move, which in turn causes the brake 5 to come into contact with the tape 2 and rub against it or disengage from the tape 2. The movement of button 3 in different positions realizes the self-locking and release functions.

[0043] In summary, by using the combination of movable bracket 4, return spring 6 and brake component 5, short-distance self-locking and release can be achieved, reducing the stroke and thus making the self-locking brake structure occupy less space.

[0044] This brake structure has good balance. No matter where you press the button 3, you can easily separate the brake component 5 from the tape 2. It can effectively prevent the problem that the brake component 5 cannot be driven by the edge of the button 3, or that there is a jamming phenomenon when pressing, which requires more force to separate the brake component 5 from the tape 2.

[0045] In this embodiment, the movable bracket 4 includes a first movable block 41 and a second movable block 42. The first movable block 41 and the second movable block 42 are symmetrically arranged with respect to the brake component 5, and their opposite ends abut against the inner ends of the button 3. The first movable block 41 and the second movable block 42 are provided with identical semi-circular holes that surround each other to form a circular hole to engage the brake component 5. The inner ends of the button 3 abut against the opposite ends of the first movable block 41 and the second movable block 42, and the middle position of the first movable block 41 and the second movable block 42 is rotatably connected to the housing 1, so that the first movable block 41 and the second movable block 42 are in a seesaw state, thereby realizing that the two ends of the first movable block 41 and the second movable block 42 move in opposite directions.

[0046] The brake component 5 engages with the circular hole formed by the opposing ends of the first movable block 41 and the second movable block 42, causing the brake component 5 to displace in the same direction as the middle portion of the first movable block 41 and the second movable block 42. Therefore, when the button 3 is in the release position, the button 3 presses down on the opposing ends of the first movable block 41 and the second movable block 42, causing the opposing ends of the first movable block 41 and the second movable block 42 to lift the brake component 5 until it disengages from the measuring tape 2.

[0047] To achieve a rotatable connection between the first movable block 41 and the second movable block 42 and the housing 1, the first movable block 41 and the second movable block 42 are rotatably supported on the housing 1 at their respective midpoints via shaft holes 44 and rotating shafts 43. The housing 1 has fixedly connected rotating shaft connection holes 45, located at both ends of the shaft holes 44 of the first movable block 41 and the second movable block 42. The rotating shaft 43 is interference-fitted with the rotating shaft connection holes 45, allowing the first movable block 41 and the second movable block 42 to rotate around the rotating shaft 43. A through circular hole is provided at the same position in the midpoint of the first movable block 41 and the second movable block 42. The rotating shaft 43 passes through this through circular hole. The length of the rotating shaft 43 is greater than the width of the first movable block 41 and the second movable block 42, and the rotating shaft 43 is a hollow annular cylinder. The housing 1 has rotating shaft connection holes 45, such as... Figure 4 The pivot connection hole 45 can be located on a protrusion extending inward from the inner wall of the housing 1. This protrusion can be integrally formed with the housing 1, or it can be fixedly connected by means including but not limited to welding, bonding, or riveting. The interference fit between the pivot 43 and the pivot connection hole 45 allows the first movable block 41 and the second movable block 42 to rotate normally around the pivot 43.

[0048] In addition, the brake component 5 includes a fixing seat 51 and a rubber pad 52. The fixing seat 51 is located inside the round hole. One end of the fixing seat 51 adjacent to the return spring 6 is provided with a protruding ring 511. The protruding ring 511 is constructed as a ring with a diameter larger than the round hole. The rubber pad 52 is fixedly connected to the fixing seat 51 and partially extends out of the fixing seat 51. The fixed base 51 has a protruding ring 511. The area around the semi-circular holes of the first movable block 41 and the second movable block 42 abuts against the protruding ring 511. When the button 3 is pressed, the button 3 presses the opposite ends of the first movable block 41 and the second movable block 42. After the first movable block 41 and the second movable block 42 rotate, the opposite ends of the first movable block 41 and the second movable block 42 move in the opposite direction. Therefore, the area around the semi-circular holes on the opposite ends of the first movable block 41 and the second movable block 42 abuts against and pushes the protruding ring 511, thereby enabling the middle part of the first movable block 41 and the second movable block 42 to drive the fixed base 51 to move. The protruding ring 511 abuts against the middle part of the first movable block 41 and the second movable block 42. The rubber pad 52 has a relatively large friction force and is relatively economical. The rubber pad 52 is fixedly connected to the end of the fixed base 51. The connection method includes, but is not limited to, gluing, riveting, or interference fit.

[0049] Under the specific structure described above:

[0050] As the button 3 is pressed down to move from the self-locking position to the release position, the button 3 pushes the opposite ends of the first movable block 41 and the second movable block 42 toward the direction of the tape 2. Since the first movable block 41 and the second movable block 42 are in a "seesaw" shape, the opposite ends of the first movable block 41 and the second movable block 42 move toward the button 3, pushing the convex ring 511 of the brake component 5 to move toward the button 3. The entire brake component 5 moves toward the button 3 with the convex ring 511 and compresses the reset spring 6 to store energy, and the rubber pad 52 disengages from the tape 2.

[0051] When the pressure on button 3 is released, the restoring force of the return spring 6 pushes the fixing seat 51 of the brake component 5 toward the ruler 2. The entire brake component 5 moves toward the ruler 2 along with the fixing seat 51 until it comes into contact with the rubber pad 52 and rubs against it. At the same time, the convex ring 511 of the brake component 5 pushes the opposing ends of the first movable block 41 and the second movable block 42 toward the ruler 2. The first movable block 41 and the second movable block 42 rotate and their opposite ends push the button 3 away from the ruler 2. The button 3 moves from the release position to the self-locking position.

[0052] As can be seen above, the force transmitted from the first movable block 41 and the second movable block 42 can lift the fixed seat 51, while the elastic force transmitted from the reset spring 6 can squeeze the first movable block 41 and the second movable block 42, so that the first movable block 41 and the second movable block 42 squeeze the button 3 to reset.

[0053] Preferably, in this embodiment, the brake component 5 is provided with an adhesive component 53. The adhesive component 53 is a cylindrical structure with adhesive layers on both sides. The diameter of the adhesive component 53 is smaller than that of the fixing seat 51. The fixing seat 51 is also provided with a rubber pad fixing groove 512 at the end away from the convex ring 511. One end of the adhesive component 53 is glued to the rubber pad fixing groove 512, and the other end is glued to the rubber pad 52. The rubber pad fixing groove 512 of the fixing seat 51 can accommodate part of the rubber pad 52. The part of the rubber pad 52 that extends out of the rubber pad fixing groove 512 can rub against the tape 2. The specific length can be set according to the space size of the tape measure. The adhesive component 53 has a certain thickness and can also absorb a certain amount of elastic potential energy. Moreover, when the tape 2 is self-locking, it can be converted into elastic pressure to squeeze the rubber pad 52.

[0054] Additionally, the top of the fixing base 51, near the convex ring 511, has an inwardly recessed cylindrical cavity. The return spring 6 abuts against this cylindrical cavity, the diameter of which is larger than the outer diameter of the return spring 6. This inwardly recessed cylindrical cavity at the top of the fixing base 51 better connects the return spring 6. Even when the force exerted on the return spring 6 by the brake component 5 shifts, the fixing base 51 ensures the return spring 6 remains in its position. Furthermore, the corresponding fixing block 7 has a mountain-shaped structure with outward protrusions on both sides and in the middle. The outward protrusion in the middle is a cuboid block 71, matching the diameter of the return spring 6. The return spring 6 is fitted onto the cuboid block 71. At this time, the return spring 6 is perpendicular to the fixing base 51 and the fixing block 7, with both ends of the return spring 6 fixed, ensuring its centered position and balanced force.

[0055] To enable the button 3 to move between the self-locking position and the release position, the button 3 includes a button body 31 and two connecting members 32 located on both sides of the button body. The connecting member 32 includes a U-shaped arm and a T-shaped part. The two free ends of the U-shaped arm are fixedly connected to the button body 31, and the bottom end of the T-shaped part is connected to the middle part of the U-shaped arm. A fixing member 8 adapted to the T-shaped part is fixedly connected inside the housing 1. The fixed connection includes, but is not limited to, adhesive, snap-fit, and riveting. A space for the T-shaped part to move is formed between the fixing member 8 and the housing 1. When the T-shaped part abuts against the fixing member 8, it is in the release position. The fixing members 8 on both sides are equidistant from the center of the button 3 and are set inside the housing 1. The space formed by the opening of the fixing member 8 is adapted to the T-shaped part of the connecting member 32, and the T-shaped part of the connecting member 32 has a structure in which the two ends of the horizontal bar protrude from the vertical bar. Therefore, the T-shaped part of the connecting member 32 can be confined within the space formed by the fixing members 8 at both ends. The space between the fixing member 8 and the inner side of the housing 1 in the vertical direction allows the T-shaped part of the connector 32 to move freely. The T-shaped part of the connector 32 can be selectively located at both ends of the space. When the button 3 is pressed down, the T-shaped part of the connector 32 abuts against the fixing member 8, which corresponds to the release position. The movable bracket 4, which is subjected to the elastic force of the reset spring 6, presses the button 3 and the connector 32 outward against the housing 1, which corresponds to the self-locking position, thereby realizing the function of the button 3. Of course, this utility model is not limited to this. The button 3 can be movably fixed on the housing 1 in any existing way.

[0056] Furthermore, the self-locking brake structure is located in the area adjacent to the pull-out outlet of the tape 2 from the housing 1. Positioning the self-locking brake structure at the tape 2 outlet position is more in line with our normal usage habits, and it is more convenient and faster to use, easier to read, avoids errors, and provides greater stability.

[0057] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0058] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0059] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "beneath" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0060] In the description of this specification, the terms "one embodiment," "some embodiments," "embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0061] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make modifications, alterations, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A measuring tape with a self-locking brake structure, comprising a housing (1) and a measuring tape (2) pullable from said housing (1), characterized in that, The self-locking brake structure includes a button (3) and a movable bracket (4), a brake component (5), a return spring (6), and a fixing block (7) located inside the housing (1); The button (3) is movably mounted on the housing (1) between the self-locking position and the release position; The movable bracket (4) is rotatably connected to the housing (1), one side of the movable bracket (4) abuts against the inner side of the button (3), and the brake (5) is snapped onto the movable bracket (4); The fixing block (7) is fixedly connected to the housing (1) and located between the button (3) and the movable bracket (4), and the reset spring (6) abuts between the fixing block (7) and the brake (5); The movement of the button (3) between the self-locking position and the release position drives the movable bracket (4) and the return spring (6) to move, thereby causing the brake (5) to rub against the ruler (2) or to disengage from the ruler (2).

2. The measuring tape with a self-locking brake structure as described in claim 1, characterized in that, During the process of pressing down the button (3) to move it from the self-locking position to the release position, the movable bracket (4) drives the brake (5) away from the tape (2) to disengage from it, and the brake (5) drives the reset spring (6) to store energy. When the pressure on the button (3) is released, the reset force of the reset spring (6) drives the movable bracket (4) to move the brake (5) toward the ruler (2) until it comes into contact with it and friction occurs. At the same time, the movable bracket (4) pushes the button (3) from the release position to the self-locking position. The moving direction of the button (3) is opposite to the moving direction of the brake (5), and both are perpendicular to the extending direction of the ruler (2).

3. The measuring tape with a self-locking brake structure as described in claim 2, characterized in that, The movable support (4) includes a first movable block (41) and a second movable block (42); The first movable block (41) and the second movable block (42) are symmetrically arranged relative to the brake component (5) and their opposite ends abut against the inner ends of the button (3). The first movable block (41) and the second movable block (42) are provided with the same semi-circular holes to form a circular hole to engage the brake component (5). When the button (3) is in the release position, the button (3) presses down on the opposite ends of the first movable block (41) and the second movable block (42), and the opposite ends of the first movable block (41) and the second movable block (42) lift the brake (5) until it is disengaged from the ruler (2).

4. The measuring tape with a self-locking brake structure as described in claim 3, characterized in that, The brake component (5) includes a fixed seat (51) and a rubber pad (52). The fixed seat (51) is located inside the circular hole. The fixed seat (51) has a protruding ring (511) at one end adjacent to the return spring (6). The protruding ring (511) is constructed as a ring with a diameter larger than the circular hole. The rubber pad (52) is fixedly connected to the fixed seat (51) and partially extends out of the fixed seat (51). During the process of pressing down the button (3) to move it from the self-locking position to the release position, the button (3) pushes the opposite ends of the first movable block (41) and the second movable block (42) to move. The opposite ends of the first movable block (41) and the second movable block (42) move toward the button (3), pushing the convex ring (511) of the brake member (5) to move toward the button (3). The brake member (5) then moves toward the button (3) and compresses the return spring (6) to store energy. The rubber pad (52) disengages from the ruler (2). When the pressure on the button (3) is released, the restoring force of the return spring (6) pushes the fixing seat (51) of the brake (5), and the brake (5) moves toward the ruler (2) until it comes into contact with the rubber pad (52) and rubs against it. At the same time, the convex ring (511) of the brake (5) pushes the opposing ends of the first movable block (41) and the second movable block (42) toward the ruler (2). The first movable block (41) and the second movable block (42) rotate and their opposite ends push the button (3) away from the ruler (2). The button (3) moves from the release position to the self-locking position.

5. The measuring tape with a self-locking brake structure as described in claim 4, characterized in that, The first movable block (41) and the second movable block (42) are rotatably supported on the housing (1) through the shaft hole (44) and the rotating shaft (43) at their respective middle positions; The housing (1) is provided with a fixedly connected rotating shaft connection hole (45), which is located at both ends of the shaft hole (44) of the first movable block (41) and the second movable block (42), respectively. The rotating shaft (43) is interference-fitted with the rotating shaft connection hole (45), and the first movable block (41) and the second movable block (42) can rotate around the rotating shaft (43).

6. The measuring tape with a self-locking brake structure as described in claim 4, characterized in that, The brake component (5) is provided with an adhesive component (53). The adhesive component (53) is a cylindrical structure with adhesive layers on both sides. The fixing seat (51) is also provided with a rubber pad fixing groove (512) at the end away from the convex ring (511). One end of the adhesive component (53) is glued to the rubber pad fixing groove (512), and the other end is glued to the rubber pad (52).

7. The measuring tape with a self-locking brake structure as described in claim 4, characterized in that, The fixed base (51) is provided with an inwardly recessed cylindrical cavity at one end near the convex ring (511), and the return spring (6) abuts against the cylindrical cavity. The diameter of the cylindrical cavity is larger than that of the return spring (6).

8. The measuring tape with a self-locking brake structure as described in claim 1, characterized in that, The button (3) includes a button body (31) and two connectors (32) located on both sides of the button body (31). The connector (32) includes a U-shaped arm and a T-shaped part. The two free ends of the U-shaped arm are fixedly connected to the button body (31). The bottom end of the T-shaped part is connected to the middle part of the U-shaped arm. A fixing member (8) adapted to the T-shaped part is fixedly connected to the inner side of the housing (1). A space for the T-shaped part to move is formed between the fixing member (8) and the housing (1). When the T-shaped part abuts against the fixing member (8), the button (3) is in the released position.

9. The measuring tape with a self-locking brake structure as described in claim 1, characterized in that, The fixing block (7) is constructed as a mountain-shaped structure with protrusions on both sides and in the middle. The shape of the protrusion in the middle is a cuboid block (71) that is adapted to the diameter of the return spring (6). The return spring (6) is sleeved on the cuboid block (71).

10. The measuring tape with a self-locking brake structure as described in any one of claims 1-9, characterized in that, The self-locking brake structure is provided in the region of the tape (2) adjacent to its pull-out port from the housing (1).

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