Tape measure with safety brake

Abstract

The disclosed tape measure includes a tape measure housing (1) having a storage cavity, a tape core assembly (2) disposed within the storage cavity, and a tape belt assembly (3) wound around the tape core assembly (2). The tape measure housing (1) is further provided with a tape outlet through which the tape belt assembly (3) extends outward. The tape measure further includes a brake assembly (4) and a drive assembly (5). The drive assembly (5) is movably mounted on the tape measure housing (1). The tape core assembly (2) is provided with a brake surface (201). When the drive assembly (5) is moved to a brake position, the drive assembly (5) drives the brake assembly (4) to contact and press against the brake surface (201) of the tape core assembly (2), thereby achieving braking. Wear of the scale on the surface of the tape belt is effectively prevented, thereby extending the service life of the tape measure.

Description

[Technical field]

[0001] The present invention relates to a tape measure, and more particularly to a more durable tape measure with good braking effect. [Background technology]

[0002] Tape measure is a measuring tool commonly used by people. Existing tape measure braking systems usually use a braking pad to contact the tape belt, and the friction force between the braking pad and the tape measure belt stops the tape measure, thereby achieving the braking of the tape measure. Due to the long-term contact and friction between the tape belt and the braking pad, the scale on the surface of the tape belt is likely to become unclear due to the friction of the braking pad, which affects the normal use of the tape measure, or the braking pad itself is worn out, thus reducing the braking ability of the tape measure. Due to the above defects, the service life of the tape measure is shortened.

[0003] The braking system of the existing tape measure needs to have a relatively large moving space, and accordingly, the volume of the tape measure also needs to have a relatively large storage space, resulting in an increase in the volume of the tape measure. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, the present invention provides a tape measure, in which the brake assembly of the tape measure contacts the tape core assembly to realize the braking effect of the tape measure, which effectively avoids the wear of the scale on the surface of the tape belt and extends the service life of the tape measure. Furthermore, the brake system of the tape measure of the present invention requires a small moving space, and therefore the tape measure of the present invention can be made with a smaller volume.

[0005] In order to achieve the above objectives, the present invention is implemented by adopting the following technical solutions: A tape measure comprising: a tape measure housing having a receiving cavity; a tape core assembly disposed within the receiving cavity; and a tape belt assembly wound around the tape core assembly, the tape measure housing further comprising a tape outlet for the tape belt assembly to extend outward; the tape measure comprising a brake assembly and a drive assembly, the drive assembly being movably mounted on the tape measure housing, the tape core assembly being provided with a brake surface, and when the drive assembly is moved to a brake position, the drive assembly drives the brake assembly to contact and press against the brake surface of the tape core assembly, thereby achieving braking.

[0006] In a tape measure, the assembly may include a single piece or multiple pieces.

[0007] The brake assembly is operated so that when the brake assembly is in the braking position, the brake assembly contacts and presses against the braking surface of the tape core assembly, thereby restraining the tape core assembly and stopping it from rotating, and otherwise the brake assembly is far away from the braking position and the brake assembly and the braking surface of the tape core assembly are not pressed against each other, thereby allowing the tape core assembly to rotate freely.

[0008] Additionally, the tape measure includes a resilient member acting on the drive assembly such that the force of the resilient member tends to move the drive assembly to the braked position.

[0009] One end of the elastic member is connected and fixed to the drive assembly, and the other end is connected and fixed to the tape measure housing. Specifically, the drive assembly is provided with a first elastic member fixing member, the first elastic member fixing member being a fixed hook, and a first fixing ring aligned with the first elastic member fixing member is provided at the connection end between the elastic member and the drive assembly and sleeved onto the first elastic member fixing member. The tape measure housing is provided with a second elastic member fixing member, the second elastic member fixing member being a fixed post, and a second fixing ring aligned with the second elastic member fixing member is provided at the connection end between the elastic member and the tape measure housing and sleeved onto the second elastic member fixing member.

[0010] When the drive assembly is far away from the braking position, the elastic member is in an elongated or compressed state. When the elastic member is in an elongated state, it tries to return to its original state and the elastic force generated by the elastic member pulls the drive assembly to move to the braking position. When the elastic member is in a compressed state, it tries to return to its original state and the elastic force generated by the elastic member pushes the drive assembly to move to the braking position.

[0011] The elastic member is a spring.

[0012] Further, the tape measure can be configured such that the drive assembly is slidably mounted on the tape measure housing and is set such that the distance between the inner wall of the tape measure housing in which the drive assembly is disposed and the braking surface of the tape core assembly varies from small to large along a direction from the braking position to away from the braking position.

[0013] Additionally, the brake assembly is connected to the drive assembly.

[0014] With the above structure, the brake assembly moves synchronously with the drive assembly. When the drive assembly is in the brake position, the brake assembly contacts and presses against the brake surface of the tape core assembly, which restrains the tape core assembly to stop rotating. When the brake assembly is far away from the brake position, the distance between the tape measure housing and the tape core assembly changes from small to large, so that the brake assembly moves as a whole from a small distance to a large distance, which causes the brake assembly to move away from the brake surface of the tape core assembly to realize the free rotation of the tape core assembly.

[0015] Furthermore, the brake assembly is a wedge-shaped member, the drive assembly is external to the tape measure housing to form an operating member, and the brake assembly is connected to the operating member via a connecting member. More specifically, the drive assembly is integrally molded with the brake assembly.

[0016] The operating member is used by an operator to operate the drive assembly.

[0017] Further, the tape measure may be configured such that the drive assembly includes a first drive member acting on the brake assembly, the first drive member being disposed on one side of the brake assembly, and when the drive assembly is moved to the braking position, the first drive member drives the brake assembly into contact with and pressing against the peripheral braking surface of the tape core assembly.

[0018] When the drive assembly moves to the braking position, the first drive member drives the brake assembly into contact with the braking surface of the tape core assembly, and the first drive member presses down on the brake assembly to transmit a force to the brake assembly, so that the brake assembly and the braking surface of the tape core assembly are pressed against each other, and thus the tape core assembly is constrained and stops rotating. When the drive assembly is far away from the braking position, the first drive member does not press down on the brake assembly, and the brake assembly and the tape core assembly are not pressed against each other, realizing free rotation of the tape core assembly.

[0019] The drive assembly further includes a second drive member acting on the brake assembly, the second drive member being disposed on an opposite side to the first drive member.

[0020] The second driving member is disposed on the opposite side of the first driving member, i.e., on the other side of the brake assembly, so that when the driving assembly is far away from the braking position, the second driving member drives the brake assembly away from the braking surface of the tape core assembly, and thus the brake assembly is moved away from the braking surface of the tape core assembly. When the tape core assembly rotates freely, the contact between the tape core assembly and the brake assembly is reduced, which reduces losses and extends the service life.

[0021] Specifically, the drive assembly protrudes toward the braking surface side of the tape core assembly to form a first drive member and a second drive member, and a movable space for accommodating the brake assembly is formed between the first drive member and the second drive member.

[0022] Further, the first drive member and the second drive member are rotatably disposed within the tape measure housing, with one end of the first drive member acting on one side of the brake assembly and one end of the second drive member acting on the other side of the brake assembly. A brake force is applied to the first drive member, which then acts on the first drive member to push down the brake assembly, so that the brake assembly always has a tendency to contact and push against the brake surface of the tape core assembly. When the tape measure is in a reverse braking state, a reverse braking force is applied to the second drive member. The reverse braking force acts on the second drive member to lift the brake assembly, so that the brake assembly is moved away from the brake surface of the tape core assembly.

[0023] Specifically, the first and second driving members adopt a plate-like structure, the braking force acts between the rotation point of the first driving member and the contact end with the brake assembly, the reverse braking force acts on the end of the second driving member remote from the brake assembly, and the rotation point of the second driving member is between the reverse braking force and the brake assembly.

[0024] More specifically, to provide a braking force, one end of the elastic member is fixed between a rotation point of the first drive member and a contact end with the brake assembly. The drive assembly includes an operating member rotatably disposed on the tape measure housing, and one end of the operating member is provided with a reverse brake lever that acts on a side of the second drive member remote from the brake assembly to provide a reverse braking force.

[0025] The elastic member acts on the first driving member. Since the point of action is located between the rotation point and the contact end with the brake assembly, the contact end of the first driving member with the brake assembly rotates toward the side closer to the brake assembly to press down the brake assembly, and therefore the brake assembly always has a tendency to press against the brake surface.

[0026] When the operating member is pressed, it rotates to the side where the reverse brake lever is located, and the reverse brake lever presses the end of the second drive member far from the brake assembly. Since the reverse brake lever and the brake assembly are located on either side of the rotation point of the second drive member, the side acting on the brake assembly lifts it, thus moving it away from the braking surface of the tape core assembly.

[0027] The operating member is released and the braking force drives the first drive member to press down on the brake assembly which then acts on the second drive member while pressing against the braking surface of the tape core assembly, thus resetting the second drive member.

[0028] The tape measure further includes a guide groove aligned with the brake assembly, the side end of which is slidably received within the guide groove.

[0029] Specifically, both ends of the brake assembly are clamped within the guide grooves.

[0030] The guide groove is used to guide the brake assembly toward or away from the braking surface of the tape core assembly.

[0031] The guide groove is arranged to provide a movement track for the brake assembly, so that the brake assembly can be smoother and more stable during movement.

[0032] Since both ends of the brake assembly are clamped in the guide groove, if the mounting part of the brake assembly clamped in the guide groove has a rotatable shape, when the brake assembly contacts the braking surface of the tape core assembly during braking, the tape core assembly drives the brake assembly to rotate, and the brake assembly and the braking surface of the tape core assembly are pressed against each other in a rolling manner. The use of rolling friction pressing effectively reduces the friction loss between the two and extends the service life of the product.

[0033] Furthermore, one end of the guide groove intersects with the braking surface or its extension surface, and the other end extends away from the braking surface toward the tape measure housing side, and along the direction of the guide groove away from the braking surface, the guide groove is inclined toward the drive assembly side.

[0034] One end of the guide groove intersects with the braking surface or an extension thereof so that the braking assembly contacts and presses against the braking surface when moving to the intersecting end of the guide groove, and the other end of the guide groove extends away from the braking surface toward the tape measure housing so that the braking assembly is separated from the braking surface when in the distal section.

[0035] Since the guide groove is inclined toward the brake assembly, a V-shaped included angle is formed between the guide groove and the brake surface of the tape core assembly. The line connecting both ends of the guide groove is called the groove axis. The included angle between the tangent of the intersection of the groove axis and the tape core assembly and the groove axis is the V-shaped included angle. When the drive assembly is in the brake position, the brake assembly moves toward the bottom of the guide groove to contact and press against the brake surface of the tape core assembly. Due to the existence of the V-shaped included angle, the more the brake assembly and the tape core assembly are pressed against each other, the greater the pressing force between them, and therefore the rotation of the tape core assembly can be stopped quickly. When the drive assembly is far away from the brake position, the brake assembly moves toward the head of the guide groove, and thus the brake assembly is separated from the tape core assembly, and then the tape core assembly rotates freely.

[0036] Additionally, a guide groove is provided on the inner wall of the tape measure housing.

[0037] Further, the drive assembly is provided with a guide member, and the guide member is provided with a guide groove.

[0038] Additionally, the brake assembly may be a round shaft or a specially shaped shaft.

[0039] By adopting a circular shaft, the friction between it and the tape core assembly can be realized as rolling friction, which effectively reduces the friction loss between the two and extends the service life of the product.

[0040] When a specially shaped shaft is employed, the brake assembly employs a wedge-shaped shaft design. When a wedge-shaped shaft is employed, only one end of the guide groove needs to intersect with the brake surface or its extension, and the other end extends away from the brake surface toward the tape measure housing.

[0041] In addition, the brake assembly is provided with a tooth structure at a corresponding position that contacts the brake surface of the tape core assembly, or the brake surface of the tape core assembly is provided with a tooth structure at a corresponding position that contacts the brake assembly. In this way, the friction force between the brake assembly and the brake surface of the tape core assembly is increased. Of course, the optical shaft structure can also realize the braking of the tape core assembly.

[0042] When a circular shaft is employed, the tooth profile of the braking surface of the tape core assembly employs an arcuate groove adapted to the circular shaft.

[0043] Furthermore, the braking surface of the tape core assembly is formed as an outer peripheral surface of the tape core assembly, or the braking surface of the tape core assembly is formed as an outwardly protruding side peripheral surface of the side surface of the tape core assembly.

[0044] Furthermore, the tape measure includes a tape measure lower branch attached to the tape outlet for supporting the underside of the tape belt assembly, thereby allowing the tape belt assembly to be pulled out more smoothly.

[0045] Compared with the prior art, the present invention has the following beneficial effects: (1) The tape measure of the present invention employs a braking assembly that contacts and presses the outer periphery of the tape core assembly to realize braking of the tape measure, which effectively prevents the scale on the surface of the tape belt from being obscured due to friction, and effectively extends the service life of the product. (2) The tape measure of the present invention adopts a circular shaft to convert the friction force between the brake assembly and the tape core assembly into rolling friction, effectively reducing the friction loss between the two. (3) The tape measure of the present invention is provided with a guide groove, so that the sliding of the brake assembly is more stable. (4) The guide groove of the tape measure of the present invention is inclined toward the brake assembly, so that a V-shaped included angle is formed between the guide groove and the tape core assembly. When the brake assembly is in the brake position, the more the brake assembly and the tape core assembly are pressed against each other, the greater the pressing force between them, so that the rotation of the tape core assembly can be stopped quickly. (5) The brake assembly and its matching parts of the tape measure of the present invention are compactly arranged, and the brake assembly requires less space to achieve conversion between braked and unbraked, and therefore the tape measure of the present invention can be made in a smaller size volume. [Brief description of the drawings]

[0046] [Figure 1] 1 is a schematic diagram of the three-dimensional structure of a tape measure according to the present invention; [Diagram 2] 1 is a schematic diagram of the internal structure of a tape measure according to a first embodiment of the present invention. [Diagram 3] FIG. 1 is a simplified schematic diagram of the internal structure of a tape measure according to a first embodiment of the present invention. [Figure 4] 6 is a schematic diagram of the internal structure of a tape measure according to a second embodiment of the present invention. FIG. [Diagram 5] FIG. 6 is a schematic diagram of an exploded structure of a tape measure according to a second embodiment of the present invention. [Figure 6] 1 is a schematic structural diagram of a tape measure according to the present invention, in which the elastic member is a compression spring; [Figure 7] FIG. 6 is a simplified schematic diagram of the internal structure of a tape measure according to a second embodiment of the present invention. [Figure 8] FIG. 11 is a structural schematic diagram of a tape measure according to embodiment 2 of the present invention, in which the braking assembly is separated from the braking surface. [Figure 9] FIG. 2 is a structural schematic diagram of a tape core assembly according to the present invention, in which the braking surface is the outer periphery. [Figure 10] FIG. 2 is a structural schematic diagram of a tape core assembly according to the present invention, in which the braking surface is a lateral periphery. [Figure 11] FIG. 11 is a structural schematic diagram of a tape measure according to embodiment 2 of the present invention, in which the braking surface is the side circumference. [Figure 12] FIG. 11 is a simplified structural schematic diagram of a tape measure according to a second embodiment of the present invention, in which the braking surface is a side circumference. [Figure 13] FIG. 11 is a structural schematic diagram of a brake assembly according to embodiment 2 of the present invention, which is a circular shaft. [Figure 14] FIG. 11 is a structural schematic diagram of a tape measure according to embodiment 2 of the present invention, in which the braking assembly is a specially shaped shaft. [Figure 15] FIG. 11 is a simplified structural schematic diagram of a tape measure according to embodiment 2 of the present invention, in which the braking assembly is a specially shaped shaft. [Figure 16] 10 is a schematic structural diagram of a tape measure according to embodiment 2 of the present invention, in which the braking surface (outer peripheral surface) has a tooth structure and an arc-shaped groove. FIG. [Figure 17] 11 is a simplified structural schematic diagram of a tape measure according to a second embodiment of the present invention, in which the braking surface (outer peripheral surface) has a tooth structure and an arc-shaped groove. FIG. [Figure 18] FIG. 5 is a schematic structural diagram of a tape measure according to a second embodiment of the present invention, in which the braking surface (circumferential side surface) has a tooth structure and an arc-shaped groove. [Figure 19] FIG. 11 is a simplified structural schematic diagram of a tape measure according to a second embodiment of the present invention, in which the braking surface (circumferential side surface) has a tooth structure and an arc-shaped groove. [Figure 20] FIG. 11 is a structural schematic diagram of a tape measure according to embodiment 2 of the present invention, in which the guide groove is disposed in the drive assembly. [Figure 21] 2 is a structural schematic diagram of a tape measure housing according to the present invention when a drive assembly is slidably mounted thereto; FIG. [Figure 22] 1 is a schematic diagram of a mating structure for a tape measure housing and a drive assembly according to the present invention when the drive assembly is slidably mounted; FIG. [Figure 23] FIG. 4 is a schematic diagram of a structure according to embodiment 3 of the present invention.

[0047] Reference symbols: 1 tape measure housing, 101 second elastic member fixing member, 102 drive assembly slot, 1021 slide rail bump, 1022 support block, 2 tape core assembly, 201 braking surface, 3 tape belt assembly, 4 braking assembly, 5 drive assembly, 501 first drive member, 502 second drive member, 503 operating member, 504 first elastic member fixing member, 505 connecting member, 5051 clamping block, 5052 support arm, 5052a bayonet, 506 reverse brake lever, 507 connecting member, 6 elastic member, 601 first fixing ring, 602 second fixing ring, 7 guide groove, 8 V-shaped bracket, and 9 tape measure lower branch. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0048] Specific implementations of the present invention will be described in more detail below with reference to the accompanying drawings and embodiments. The following embodiments are provided to illustrate the present invention and are not intended to limit the scope of the present invention.

[0049] EMBODIMENT 1 As shown in Figures 1 to 3, the tape measure includes a tape measure housing 1 provided with a receiving cavity, a tape core assembly 2 disposed in the receiving cavity, and a tape belt assembly 3 wound around the tape core assembly 2. The tape measure housing 1 is further provided with a tape outlet for the tape belt assembly 3 to extend outward. The tape measure includes a brake assembly 4 and a drive assembly 5. The drive assembly 5 is movably mounted on the tape measure housing 1, the tape core assembly 2 is provided with a brake surface 201, and when the drive assembly 5 moves to a brake position, the drive assembly 5 drives the brake assembly 4 to contact and press against the brake surface 201 of the tape core assembly 2, thus achieving braking.

[0050] In a tape measure, the assembly may include a single piece or multiple pieces.

[0051] The brake assembly 4 is operated such that when the brake assembly 4 is in the braking position, the brake assembly 4 contacts and presses against the braking surface 201 of the tape core assembly 2, thereby restraining the tape core assembly 2 and stopping it from rotating, otherwise the brake assembly 4 is far away from the braking position and the brake assembly 4 and the braking surface 201 of the tape core assembly 2 are not pressed against each other, thereby allowing the tape core assembly 2 to rotate freely.

[0052] Preferably, the tape measure comprises a resilient member 6 acting on the drive assembly 5, the force of which tends to move the drive assembly 5 to a braked position.

[0053] As shown in Fig. 2, one end of the elastic member 6 is connected and fixed to the drive assembly 5, and the other end is connected and fixed to the tape measure housing 1. Specifically, the drive assembly 5 is provided with a first elastic member fixing member 504, which is a fixed hook, and a first fixing ring 601 aligned with the first elastic member fixing member 504 is provided at the connection end between the elastic member 6 and the drive assembly 5 and is sleeved on the first elastic member fixing member 504. The tape measure housing 1 is provided with a second elastic member fixing member 101, which is a fixed post, and a second fixing ring 602 aligned with the second elastic member fixing member 101 is provided at the connection end between the elastic member 6 and the tape measure housing 1 and is sleeved on the second elastic member fixing member 101.

[0054] When the drive assembly 5 is far away from the braking position, the elastic member 6 is in an elongated state or a compressed state. As shown in Figure 2, when the elastic member 6 is in an elongated state, the elastic member 6 tries to return to its original state, and the elastic force generated by the elastic member pulls the drive assembly 5 to move to the braking position. Referring to Figure 6, when the elastic member 6 is in a compressed state, the elastic member 6 tries to return to its original state, and the elastic force generated by the elastic member pushes the drive assembly 5 to move to the braking position.

[0055] The elastic member 6 is a spring.

[0056] Preferably, the drive assembly 5 is slidably mounted on the tape measure housing 1 and is configured such that the distance between the inner wall of the tape measure housing 1 on which the drive assembly 5 is located and the braking surface 201 of the tape core assembly 2 changes from small to large along the direction from the braking position to away from the braking position.

[0057] Preferably, the brake assembly 4 is connected to a drive assembly 5 .

[0058] With the above structure, the brake assembly 4 moves synchronously with the drive assembly 5. When the drive assembly 5 is located at the brake position, the brake assembly 4 contacts and presses against the brake surface 201 of the tape core assembly 2, so that the tape core assembly 2 is restrained and stops rotating. When the brake assembly 4 is away from the brake position, the distance between the tape measure housing 1 and the tape core assembly 2 changes from small to large, so that the brake assembly 4 moves as a whole from a small distance to a large distance, and the brake assembly 4 is separated from the brake surface 201 of the tape core assembly 2, realizing the free rotation of the tape core assembly 2.

[0059] Preferably, the brake assembly 4 is a wedge-shaped member and the drive assembly 5 extends outside the tape measure housing 1 to form an operating member 503, and the brake assembly 4 is connected to the operating member 503 through a connecting member 507. In another embodiment, the drive assembly 5 is integrally molded with the brake assembly 4.

[0060] The operating member 503 is used by an operator to operate the drive assembly 5 .

[0061] Preferably, the braking surface 201 of the tape core assembly 2 is formed as an outer peripheral surface of the tape core assembly 2, or the braking surface 201 of the tape core assembly 2 is formed as an outwardly protruding side peripheral surface of the side surface of the tape core assembly 2.

[0062] Preferably, the tape measure comprises a tape measure lower branch 9 attached to the tape outlet for supporting the underside of the tape belt assembly 3, so that the tape belt assembly 3 can be pulled out more smoothly.

[0063] EMBODIMENT 2 As shown in Fig. 1 and Figs. 4 to 20, the tape measure includes a tape measure housing 1 having a receiving cavity, a tape core assembly 2 disposed in the receiving cavity, and a tape belt assembly 3 wound around the tape core assembly 2. The tape measure housing 1 is further provided with a tape outlet for the tape belt assembly 3 to extend outward. The tape measure includes a brake assembly 4 and a drive assembly 5. The drive assembly 5 is movably mounted on the tape measure housing 1, the tape core assembly 2 is provided with a brake surface 201, and when the drive assembly 5 moves to a brake position, the drive assembly 5 drives the brake assembly 4 to contact and press against the brake surface 201 of the tape core assembly 2, thereby achieving braking.

[0064] In a tape measure, the assembly may include a single piece or multiple pieces.

[0065] The brake assembly 4 is operated such that when the brake assembly 4 is in the braking position, the brake assembly 4 contacts and presses against the braking surface 201 of the tape core assembly 2, thereby restraining the tape core assembly 2 and stopping it from rotating, otherwise the brake assembly 4 is far away from the braking position and the brake assembly 4 and the braking surface 201 of the tape core assembly 2 are not pressed against each other, thereby allowing the tape core assembly 2 to rotate freely.

[0066] Preferably, the tape measure comprises a resilient member 6 acting on the drive assembly 5, the force of which tends to move the drive assembly 5 to a braked position.

[0067] When the drive assembly 5 is far away from the braking position, the elastic member 6 is in a stretched or compressed state and generates an elastic force acting on the drive assembly 5, so that the drive assembly 5 has a tendency to move to the braking position. The elastic member 6 employs a spring.

[0068] Preferably, the drive assembly 5 comprises a first drive member 501 acting on the brake assembly 4, the first drive member 501 being arranged on one side of the brake assembly 4, and when the drive assembly 5 moves to the braking position, the first drive member 501 drives the brake assembly 4 into contact with and pressing against the outer peripheral braking surface 201 of the tape core assembly 2.

[0069] A drive assembly 5 is slidably mounted on the tape measure housing 1 .

[0070] When the drive assembly 5 moves to the braking position, the first drive member 501 drives the brake assembly 4 to contact the braking surface 201 of the tape core assembly 2, and the first drive member 501 presses down the brake assembly 4 and transmits a force to the brake assembly 4, so that the brake assembly 4 and the braking surface 201 of the tape core assembly 2 are pressed against each other, and then the tape core assembly 2 is restrained and stops rotating. When the drive assembly 5 is far away from the braking position, the first drive member 501 does not press down the brake assembly 4, and the brake assembly 4 and the tape core assembly 2 are not pressed against each other, realizing the free rotation of the tape core assembly 2.

[0071] Preferably, the drive assembly 5 comprises a second drive member 502 acting on the brake assembly 4 , the second drive member 502 being arranged on the opposite side to the first drive member 501 .

[0072] The second driving member 502 is disposed on the opposite side to the first driving member 501, i.e., on the other side of the brake assembly 4, so that when the driving assembly 5 is far away from the braking position, the second driving member 502 drives the brake assembly 4 away from the braking surface 201 of the tape core assembly 2, and thus the brake assembly 4 is moved away from the braking surface 201 of the tape core assembly 2. When the tape core assembly 2 rotates freely, the contact between the tape core assembly 2 and the brake assembly 4 is reduced, which reduces losses and extends the service life.

[0073] Specifically, the drive assembly 5 protrudes toward the braking surface 201 of the tape core assembly 2 to form a first drive member 501 and a second drive member 502, and a movable space for accommodating the brake assembly 4 is formed between the first drive member 501 and the second drive member 502.

[0074] As shown in FIGS. 21 and 22, the tape measure housing 1 is preferably provided with a drive assembly slot 102, and the drive assembly 5 is slidably disposed in the drive assembly slot 102. The drive assembly slot 102 is provided with slide rail bumps 1021 on both sides of the braking position, and a support block 1022 on the side away from the braking position. The drive assembly 5 includes an operating member 503 formed from the drive assembly slot 102 and extending out of the tape measure housing, a driving portion located in the tape measure housing, and a connecting portion 505 for connecting the driving portion and the operating member 503. The connecting portion 505 includes a clamping block 5051 and a support arm 5052. The clamping block 5051 is recessed inwardly relative to the operating member 503 and the driving portion, and the connecting portion 505 extends to both sides of the tape measure housing and contacts the edges of the drive assembly slot 102 to form the support arm 5052. The support arm 5052 is provided with a bayonet 5052 a aligned with the edge of the drive assembly slot 102 at the point of contact between the support arm 5052 and the edge of the drive assembly slot 102 .

[0075] Specifically, the driving portion includes a first driving member 501 and a second driving member 502. The first driving member 501 and the second driving member 502 protrude from a connecting portion 505. A movable space for accommodating the brake assembly 4 is formed between the first driving member 501 and the second driving member 502. The support arm 5052 is formed on the side of the first driving member 501.

[0076] During assembly, the clamping block 5051 of the connecting portion 505 is clamped between the slide rail bumps 1021 on either side of the drive assembly slot 102. The clamping block 5051 is recessed inwardly relative to the operating member 503 and the drive portion, so that a slide rail groove aligned with the slide rail bumps 1021 is formed, and thus the drive assembly 5 is slidably clamped within the drive assembly slot 102.

[0077] A support block 1022 provided in the drive assembly slot 102 is used to support the operating member 503 away from the braking position side when the drive assembly 5 is slid.

[0078] The support arms 5052 are in contact with the edges of the drive assembly slot 102 so that the drive assembly 5 slides more stably and smoothly.

[0079] Preferably, the tape measure includes a guide groove 7 aligned with the brake assembly 4. A side end of the brake assembly 4 is slidably clamped within the guide groove 7.

[0080] Specifically, both ends of the brake assembly 4 are clamped in the guide groove 7 .

[0081] The guide groove 7 is used to guide the brake assembly 4 towards or away from the brake surface 201 of the tape core assembly 2 .

[0082] The guide groove 7 is arranged to provide a moving track for the brake assembly 4, so that the brake assembly 4 can be smoother and more stable when moving.

[0083] Both ends of the brake assembly 4 are clamped in the guide groove 7, so if the mounting portion of the brake assembly 4 clamped in the guide groove 7 has a rotatable shape, during braking, when the brake assembly 4 contacts the braking surface 201 of the tape core assembly 2, the tape core assembly 2 drives the brake assembly 4 to rotate, so that the brake assembly 4 and the braking surface 201 of the tape core assembly 2 are pressed against each other in a rolling manner. The use of rolling friction pressing effectively reduces the friction loss between them and extends the service life of the product.

[0084] Preferably, one end of the guide groove 7 intersects with the braking surface 201 or its extension surface, and the other end extends away from the braking surface 201 toward the side of the tape measure housing 1, and along the direction of the guide groove 7 away from the braking surface 201, the guide groove 7 inclines toward the side of the drive assembly 5.

[0085] One end of the guide groove 7 intersects with the braking surface 201 or an extension thereof, so that when the brake assembly 4 moves to the intersecting end of the guide groove 7, it contacts and presses against the braking surface 201. The other end of the guide groove 7 extends away from the braking surface 201 towards the side of the tape measure housing 1, so that the brake assembly 4 is separated from the braking surface 201 when it is in the distal section.

[0086] As shown in FIG. 7, the guide groove 7 is inclined toward the brake assembly 4, so that a V-shaped included angle 8 is formed between the guide groove 7 and the brake surface 201 of the tape core assembly 2. The line connecting both ends of the guide groove 7 is called the groove axis. The included angle between the tangent line of the intersection of the groove axis and the tape core assembly 2 and the groove axis is the V-shaped included angle 8. When the drive assembly 5 is in the braking position, the brake assembly 4 moves toward the bottom of the guide groove 7 to contact and press the brake surface 201 of the tape core assembly 2. Due to the existence of the V-shaped included angle 8, the more the brake assembly 4 and the tape core assembly 2 are pressed against each other, the greater the pressing force between them, and therefore the rotation of the tape core assembly 2 can be stopped quickly. When the drive assembly 5 is far away from the braking position, the brake assembly 4 moves toward the head of the guide groove 7, so that the brake assembly 4 is separated from the tape core assembly 2 and the tape core assembly 2 rotates freely.

[0087] Preferably, the guide groove 7 is provided on the inner wall of the tape measure housing 1 .

[0088] As shown in FIG. 20, the drive assembly 5 is preferably provided with a guide member, and the guide member is provided with a guide groove 7 .

[0089] Preferably, the brake assembly 4 is a round shaft or a specially shaped shaft.

[0090] By adopting the circular shaft, the friction between it and the tape core assembly 2 can be realized as rolling friction, which effectively reduces the friction loss between the two and extends the service life of the product. As shown in Fig. 13, in Fig. 13, the upper circular shaft in the figure is a circular shaft provided with a tooth structure, and the lower circular shaft in the figure is an optical shaft.

[0091] 14 and 15, when a specially shaped shaft is adopted, the brake assembly 4 adopts a wedge-shaped shaft design. When a wedge-shaped shaft is adopted, only one end of the guide groove 7 needs to intersect with the brake surface 201 or its extension, and the other end extends away from the brake surface 201 toward the side of the tape measure housing 1.

[0092] Preferably, as shown in the upper diagram of Fig. 13, the braking assembly 4 is provided with a tooth structure at a corresponding position in contact with the braking surface 201 of the tape core assembly 2, or the braking surface 201 of the tape core assembly 2 is provided with a tooth structure at a corresponding position in contact with the braking assembly 4. In this way, the friction force between the braking assembly 4 and the braking surface 201 of the tape core assembly 2 is increased, as shown in Figs. 16 and 17. Of course, the optical shaft structure can also realize the braking of the tape core assembly 2.

[0093] As shown in FIGS. 16-19, when a circular shaft is adopted, the tooth structure of the braking surface 201 of the tape core assembly 2 adopts an arc-shaped groove aligned with the circular shaft.

[0094] Preferably, the braking surface 201 of the tape core assembly 2 is formed as an outer peripheral surface of the tape core assembly 2, or the braking surface 201 of the tape core assembly 2 is formed as an outwardly protruding side peripheral surface of the side surface of the tape core assembly 2.

[0095] The braking surface 201 of the tape core assembly 2 adopts a toothed structure, i.e., the outer peripheral surface or the side peripheral surface of the tape core assembly 2 adopts a toothed structure. As shown in Figures 16 to 19, when a circular shaft is adopted, the toothed structure of the braking surface 201 of the tape core assembly 2 adopts an arc-shaped groove aligned with the circular shaft, i.e., the outer peripheral surface or the side peripheral surface of the tape core assembly 2 adopts an arc-shaped groove aligned with the circular shaft.

[0096] Preferably, the tape measure comprises a tape measure lower branch 9 attached to the tape outlet for supporting the underside of the tape belt assembly 3, so that the tape belt assembly 3 can be pulled out more smoothly.

[0097] EMBODIMENT 3 As shown in Figures 1 and 23, the tape measure includes a tape measure housing 1 provided with a receiving cavity, a tape core assembly 2 disposed within the receiving cavity, and a tape belt assembly 3 wound around the tape core assembly 2. The tape measure housing 1 is further provided with a tape outlet for the tape belt assembly 3 to extend outward. The tape measure includes a brake assembly 4 and a drive assembly 5. The drive assembly 5 is movably mounted on the tape measure housing 1, the tape core assembly 2 is provided with a brake surface 201, and when the drive assembly 5 moves to a brake position, the drive assembly 5 drives the brake assembly 4 to contact and press against the brake surface 201 of the tape core assembly 2, thereby achieving braking.

[0098] In a tape measure, the assembly may include a single piece or multiple pieces.

[0099] Preferably, the tape measure includes an elastic member 6 acting on the drive assembly 5, such that the drive assembly 5 tends to move to the braking position due to the force of the elastic member 6. The elastic member 6 employs a spring.

[0100] Preferably, the drive assembly 5 comprises a first drive member 501 acting on the brake assembly 4, the first drive member 501 being arranged on one side of the brake assembly 4, and when the drive assembly 5 moves to the braking position, the first drive member 501 drives the brake assembly 4 into contact with and pressing against the outer peripheral braking surface 201 of the tape core assembly 2.

[0101] Preferably, the drive assembly 5 comprises a second drive member 502 acting on the brake assembly 4 , the second drive member 502 being arranged on the opposite side to the first drive member 501 .

[0102] Preferably, the first drive member 501 and the second drive member 502 are rotatably arranged in the tape measure housing 1, with one end of the first drive member 501 acting on one side of the brake assembly 4 and one end of the second drive member 502 acting on the other side of the brake assembly 4. A braking force is applied to the first drive member 501, which acts on the first drive member 501 to push down the brake assembly 4, so that the brake assembly 4 always has a tendency to contact and push the brake surface 201 of the tape core assembly 2. When the tape measure is in a reverse braking state, a reverse braking force is applied to the second drive member 502. The reverse braking force acts on the second drive member 502 to lift the brake assembly 4, so that the brake assembly is moved away from the brake surface 201 of the tape core assembly 2.

[0103] Specifically, the first driving member 501 and the second driving member 502 adopt a plate-like structure, and the braking force acts between the rotation point of the first driving member 501 and the contact end with the brake assembly 4. The reverse braking force acts on the end of the second driving member 502 far from the brake assembly 4, and the rotation point of the second driving member 502 is between the reverse braking force and the brake assembly 4.

[0104] More specifically, in order to provide a braking force, one end of the elastic member 6 is fixed between a rotation point of the first driving member 501 and a contact end with the brake assembly 4. The driving assembly 5 includes an operating member 503, which is rotatably disposed on the tape measure housing 1, and one end of the operating member 503 is provided with a reverse brake lever 506, which acts on the side of the second driving member 502 remote from the brake assembly 4 to provide a reverse braking force.

[0105] The elastic member 6 acts on the first driving member 501. Since the point of action is located between the rotation point and the contact end with the brake assembly 4, the contact end of the first driving member 501 with the brake assembly 4 rotates toward the side closer to the brake assembly 4 and presses down the brake assembly 4, so that the brake assembly 4 always has a tendency to press the brake surface 201.

[0106] The rotation point of the operating member 503 and the reverse brake lever 506 are located at both ends of the operating member, respectively. As a result, the operating member 503 is pushed, and the operating member 503 rotates to the side where the reverse brake lever 506 is located, and the reverse brake lever 506 presses the end of the second driving member 502 far from the brake assembly 4. Since the reverse brake lever 506 and the brake assembly 4 are located on both sides of the rotation point of the second driving member 502, the side acting on the brake assembly 4 lifts the brake assembly 4, and therefore the brake assembly 4 is moved away from the brake surface 201 of the tape core assembly 2.

[0107] The operating member 503 is released and the braking force drives the first driving member 501 to press down on the braking assembly 4, which acts on the second driving member 502 while pressing against the braking surface 201 of the tape core assembly 2, thus resetting the second driving member 502.

[0108] Preferably, the tape measure includes a guide groove 7 aligned with the brake assembly 4. A side end of the brake assembly 4 is slidably clamped in the guide groove 7.

[0109] Specifically, both ends of the brake assembly 4 are clamped in the guide grooves 7 .

[0110] Preferably, one end of the guide groove 7 intersects with the braking surface 201 or an extension thereof, and the other end extends away from the braking surface 201 toward the side of the tape measure housing 1, and along the direction of the guide groove 7 away from the braking surface 201, the guide groove 7 inclines toward the side of the drive assembly 5. As the guide groove 7 inclines toward the side of the braking assembly 4, a V-shaped included angle 8 is formed between the guide groove 7 and the braking surface 201 of the tape core assembly 2.

[0111] Preferably, the guide groove 7 is provided on the inner wall of the tape measure housing 1 .

[0112] Preferably, the drive assembly 5 is provided with a guide member, in which a guide groove 7 is provided.

[0113] Preferably, the brake assembly 4 is a round shaft or a specially shaped shaft.

[0114] Preferably, the braking assembly 4 is provided with a tooth structure at a corresponding position in contact with the braking surface 201 of the tape core assembly 2, or the braking surface 201 of the tape core assembly 2 is provided with a tooth structure at a corresponding position in contact with the braking assembly 4. In this way, the friction force between the braking assembly 4 and the braking surface 201 of the tape core assembly 2 is increased. Of course, the optical shaft structure can also realize the braking of the tape core assembly 2.

[0115] Preferably, the braking surface 201 of the tape core assembly 2 is formed as an outer peripheral surface of the tape core assembly 2, or the braking surface 201 of the tape core assembly 2 is formed as an outwardly protruding side peripheral surface of the side surface of the tape core assembly 2.

[0116] Preferably, the tape measure comprises a tape measure lower branch 9 attached to the tape outlet for supporting the underside of the tape belt assembly 3, so that the tape belt assembly 3 can be pulled out more smoothly.

[0117] The above is only the preferred embodiment of the present invention. It is pointed out that those skilled in the art can make some improvements and modifications without departing from the technical principle of the present invention. These improvements and modifications should also be regarded as within the protection scope of the present invention.

Claims

1. A tape measure comprising: a tape measure housing (1) provided with a receiving cavity; a tape core assembly (2) disposed in the receiving cavity; and a tape belt assembly (3) wound around the tape core assembly (2), the tape measure housing (1) further being provided with a tape outlet for the tape belt assembly (3) to extend outward; the tape measure comprises a brake assembly (4) and a drive assembly (5), the drive assembly (5) being movably mounted on the tape measure housing (1), the tape core assembly (2) being provided with a brake surface (201), and when the drive assembly (5) is in a brake position, the drive assembly (5) drives the brake assembly (4) to contact and press against the brake surface (201) of the tape core assembly (2), thereby achieving braking; the drive assembly (5) comprises a first drive member (501) acting on the brake assembly (4), the first drive member (501) being disposed on one side of the brake assembly (4), and when the drive assembly (5) is in the brake position, the first drive member (501) drives the brake assembly (4) to contact and press against a brake surface (201) of the tape core assembly (2); The tape measure is characterized in that it has a guide groove (7) aligned with the brake assembly (4), the side end of the brake assembly (4) is slidably clamped within the guide groove (7), and the guide groove (7) is inclined toward the side of the brake assembly (4) so ​​that a V-shaped angle (8) is formed between a groove axis, which is a line connecting both ends of the guide groove (7), and a tangent to the intersection of the groove axis and the brake surface (201) of the tape core assembly (2).

2. 2. The tape measure according to claim 1, characterized in that the tape measure comprises an elastic member (6) acting on the drive assembly (5), the force of which tends to move the drive assembly (5) to the braking position.

3. 2. The tape measure according to claim 1, characterized in that the drive assembly (5) comprises a second drive member (502) acting on the brake assembly (4), the second drive member (502) being arranged on the opposite side to the first drive member (501).

4. The tape measure according to claim 3, characterized in that the drive assembly (5) protrudes toward the braking surface (201) side of the tape core assembly (2) to form the first drive member (501) and the second drive member (502), and a movable space for accommodating the brake assembly (4) is formed between the first drive member (501) and the second drive member (502).

5. The first driving member (501) and the second driving member (502) are rotatably arranged in the tape measure housing (1), one end of the first driving member (501) acts on one side of the brake assembly (4), one end of the second driving member (502) acts on the other side of the brake assembly (4), and a braking force is applied to the first driving member (501), which acts on the first driving member (501) to push down the brake assembly (4), thus pushing down the brake assembly (4).

4. The tape measure of claim 3, wherein the brake assembly (4) always has a tendency to contact and press against the braking surface (201) of the tape core assembly (2), the tape measure is in a reverse braking state, a reverse braking force is applied to the second drive member (502), the reverse braking force acts on the second drive member (502) to lift the brake assembly (4), and thus the brake assembly is moved away from the braking surface (201) of the tape core assembly (2).

6. 2. The tape measure according to claim 1, characterized in that one end of the guide groove (7) intersects with the braking surface (201) or its extension, and the other end of the guide groove (7) extends away from the braking surface (201) toward the side of the tape measure housing (1).

7. 7. A tape measure according to claim 6, characterized in that along the direction of the guide groove (7) away from the braking surface (201), the guide groove (7) is inclined towards the side of the drive assembly (5).

8. 2. Tape measure according to claim 1, characterized in that the guide groove (7) is provided on the inner wall of the tape measure housing (1).

9. 2. A tape measure according to claim 1, characterized in that the drive assembly (5) is provided with a guide member, the guide member being provided with the guide groove (7).

10. 2. A tape measure according to claim 1, characterized in that the braking assembly (4) is a round shaft or a specially shaped shaft.

11. 2. The tape measure according to claim 1, characterized in that the braking assembly (4) is provided with a toothed structure at a corresponding position in contact with the braking surface of the tape core assembly (2) or the braking surface (201) of the tape core assembly (2) is provided with a toothed structure at a corresponding position in contact with the braking assembly (4).

12. The tape measure of claim 1, wherein the braking surface (201) of the tape core assembly (2) is formed as an outer peripheral surface of the tape core assembly (2), or the braking surface (201) of the tape core assembly (2) is formed as a side peripheral surface protruding outward from a side surface of the tape core assembly (2).

13. The tape measure housing (1) is provided with a drive assembly slot (102), the drive assembly (5) is slidably disposed within the drive assembly slot (102), the drive assembly slot (102) is provided with slide rail bumps (1021) on both sides of the braking position and a support block (1022) on the side remote from the braking position, the drive assembly (5) is formed from the drive assembly slot (102) and includes an operating member (503) extending outside the tape measure housing (1), a driving portion located within the tape measure housing (1), and a connection portion for connecting the driving portion and the operating member (503).

2. The tape measure according to claim 1, further comprising a connecting portion (505) comprising a clamping block (5051) and a support arm (5052), the clamping block (5051) being recessed inwardly with respect to the operating member (503) and the drive portion, the connecting portion (505) extending to both sides of the tape measure housing (1) and contacting an edge of the drive assembly slot (102) to form the support arm (5052), the support arm (5052) being provided with a bayonet (5052a) aligned with the edge of the drive assembly slot (102) at the contact point between the support arm (5052) and the edge of the drive assembly slot (102).

14. 2. The tape measure according to claim 1, characterized in that the mounting portion of the brake assembly (4) clamped in the guide groove (7) is in a rotatable shape, and the brake assembly (4) and the brake surfaces (201) of the tape core assembly (2) are pressed against each other in a rolling manner.

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