Fly hammer type deceleration measuring tape

Abstract

The embodiment of the utility model provides a fly ball type deceleration measuring tape, which relates to the technical field of measuring devices and comprises a shell, a hub, a fly ball assembly and a reset assembly. Wherein the hub is rotationally connected with the shell. The fly ball assembly is rotationally connected with the hub and used for rotating in the direction close to the shell under the centrifugal effect and colliding with the shell to achieve braking under the condition that the hub reaches the preset rotating speed. The reset assembly is connected with the hub and used for enabling the fly ball assembly to rotate in the direction away from the shell, so that braking balance is formed between the fly ball assembly and the reset assembly, and the hub is lower than the preset rotating speed or kept at the preset rotating speed. Therefore, the recovery speed of the tape can be kept at a lower speed at which hands are not cut, and safe recovery is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of measuring devices, in particular to a fly-hammer type deceleration tape measure. Background Art

[0002] In the field of steel tape measures, when a tape is retracted, the tape is rapidly rewound by the tightened coil spring, which exerts a significant force on the tape, causing it to gradually accelerate. Typically, a tape several meters long can be fully retracted within three seconds. This imparts significant kinetic energy to the thin, sharp tape.

[0003] However, if the user's hand is too close to the tape, or the tape is retracted at an angle, or the hub is stuck, causing the tape to bend and retract, the tape retracts too quickly and the user often does not have time to react, risking being hit or cut. Utility Model Content

[0004] The purpose of the utility model includes providing a fly-hammer type deceleration tape measure, which can brake and decelerate so that the recovery speed of the tape is maintained at a low speed that will not cut people's hands, thereby achieving safe recovery.

[0005] The embodiment of the present utility model can be implemented as follows:

[0006] In a first aspect, the utility model provides a fly-hammer type deceleration tape measure, comprising:

[0007] case;

[0008] a wheel hub, the wheel hub being rotatably connected to the housing;

[0009] A flyweight assembly is rotatably connected to the wheel hub and is configured to rotate toward the housing under centrifugal action and collide with the housing when the wheel hub reaches a preset speed;

[0010] The reset assembly is connected to the wheel hub and is used to rotate the flyweight assembly in a direction away from the housing.

[0011] In an optional embodiment, the housing is provided with a reduction tooth, and the flyweight assembly is used to rotate toward the reduction tooth under the action of centrifuge, and collide with the reduction tooth when the hub reaches a preset speed.

[0012] In an optional embodiment, there are multiple reduction teeth, and the multiple reduction teeth are arranged at equal intervals along the circumference of the housing.

[0013] In an optional embodiment, a first inclined surface is provided at one end of the reduction tooth close to the flyweight assembly, and the flyweight assembly is provided with a second inclined surface that matches the first inclined surface.

[0014] In an optional embodiment, the flyweight assembly includes a first braking portion, a second braking portion, and a connecting portion connecting the first braking portion and the second braking portion;

[0015] Among them, the connecting part is rotatably connected to the wheel hub; the first braking part is abutted or connected to the reset assembly; the second braking part is used to rotate toward the shell under the action of centrifugal force, and collide with the shell when the wheel hub reaches a preset speed.

[0016] In an optional embodiment, the first braking portion is at least partially in an arc structure, and the arc structure abuts against the reset assembly.

[0017] In an optional embodiment, the flyweight assembly further includes a counterweight connected to the second braking portion.

[0018] In an optional embodiment, the wheel hub is further provided with a fixing frame, the reset assembly includes a reset spring, and one end of the reset spring is connected to the fixing frame, and the other end thereof is abutted against the flyweight assembly.

[0019] In an optional embodiment, the reset assembly further includes a reset rod that is slidably engaged with the fixing frame, and the reset spring is sleeved on the reset rod and is supported by the fly hammer assembly through the reset rod.

[0020] In an optional embodiment, the number of the flyweight assemblies is at least two, and the at least two flyweight assemblies are equidistantly spaced along the circumference of the hub.

[0021] The beneficial effects of the fly-hammer deceleration tape measure provided by the embodiment of the utility model include:

[0022] An embodiment of the present utility model provides a flyweight type deceleration tape measure, comprising a shell, a wheel hub, a flyweight assembly and a reset assembly. The wheel hub is rotatably connected to the shell. The flyweight assembly is rotatably connected to the wheel hub, and is used to rotate toward the shell under the action of centrifugation, and when the wheel hub reaches a preset speed, it collides with the shell to achieve braking. The reset assembly is connected to the wheel hub, and is used to rotate the flyweight assembly away from the shell, thereby forming a braking balance with the reset assembly, so that the wheel hub is lower than the preset speed or remains at the preset speed. Therefore, the recovery speed of the tape can be maintained at a lower speed that will not cut people's hands, thereby achieving safe recovery. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 A schematic structural diagram of a fly-hammer deceleration tape measure provided in this embodiment;

[0025] Figure 2 A partial schematic diagram of the fly-hammer type deceleration tape provided in this embodiment;

[0026] Figure 3 A schematic diagram of the structure of the fly hammer provided in this embodiment;

[0027] Figure 4 Another partial schematic diagram of the fly-hammer deceleration tape provided in this embodiment.

[0028] Icon: 10-flyweight reduction tape; 100-wheel hub; 110-fixed bracket; 300-flyweight assembly; 310-first braking part; 330-connecting part; 350-second braking part; 351-second inclined surface; 370-counterweight; 500-reset assembly; 510-reset spring; 530-reset rod; 700-housing; 710-reduction gear; 711-first inclined surface. DETAILED DESCRIPTION

[0029] The steel measuring tape in the related art has the risk of hitting or cutting the user due to the excessively fast speed at which the measuring tape is recovered.

[0030] In response to the above problems, the present invention provides a fly-hammer type deceleration tape measure, which can keep the tape recovery speed at a low speed that will not cut people's hands, thereby achieving the purpose of safe recovery.

[0031] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are intended to fall within the scope of protection of the present invention.

[0033] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0034] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the utility model product is usually placed when in use. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0035] In addition, the terms "first", "second", etc., if used, are merely used to distinguish and describe, and should not be understood as indicating or implying relative importance.

[0036] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention can be combined with each other.

[0037] The overall structure, working principle and technical effects of the fly-hammer type deceleration tape measure 10 provided by the present invention are described in detail below through embodiments and in conjunction with the accompanying drawings.

[0038] See also Figure 1 and Figure 2 , Figure 1 This is a schematic structural diagram of the fly hammer deceleration tape 10 provided in this embodiment. Figure 2 This is a partial schematic diagram of a flyweight deceleration tape measure 10 provided in this embodiment. This embodiment of the utility model provides a flyweight deceleration tape measure 10 for use in measurement scenarios such as architecture, construction, or furniture making, and includes a housing 700, a hub 100, a flyweight assembly 300, and a reset assembly 500.

[0039] The hub 100 is rotatably connected to the housing 700. The hub 100 is typically used to wind a tape measure. The tape retraction speed actually refers to the rotational speed of the hub 100 when the tape measure is retracted. Therefore, when the rotational speed of the hub 100 decreases, the tape retraction speed decreases accordingly, and the kinetic energy captured also decreases.

[0040] The flyweight assembly 300 is rotatably connected to the wheel hub 100 and is configured to rotate toward the housing 700 under centrifugal force. When the wheel hub 100 reaches a preset rotational speed, it collides with the housing 700, achieving braking. The reset assembly 500, connected to the wheel hub 100, is configured to rotate the flyweight assembly 300 away from the housing 700, thereby creating a braking balance with the reset assembly 500 to keep the wheel hub 100 below or at a preset rotational speed. It will be readily understood that the preset rotational speed of the wheel hub 100 is the speed at which the tape will not injure a person's hand, thereby ensuring safe recovery.

[0041] Specifically, when the wheel hub 100 is stationary and the flyweight assembly 300 is not subjected to centrifugal force, the flyweight assembly 300 is in the initial position and maintains a certain distance from the shell 700; when the wheel hub 100 is lower than the preset speed, the flyweight assembly 300 is subjected to centrifugal force, thrown outward and close to the shell 700, and the reset assembly 500 generates reverse resistance to form a dynamic balance, and the flyweight assembly 300 maintains its position; when the wheel hub 100 is greater than or equal to the preset speed, the flyweight assembly 300 overcomes the reverse resistance of the reset assembly 500 and collides with the shell 700, causing the wheel hub 100 to decelerate to the preset speed and tend to be safely recovered at a uniform speed.

[0042] It is easy to understand that during the above process, the centrifugal force and the torque of the reset assembly 500 act together to impart a certain rotational torque to the flyweight assembly 300, enabling the flyweight assembly 300 to exert a deceleration and braking effect at various speeds. Furthermore, as the rotational speed of the wheel hub 100 increases, the centrifugal force and centrifugal torque increase, the rotation angle of the flyweight assembly 300 increases, the collision amplitude and number of collisions increase, and the deceleration effect becomes more pronounced.

[0043] In some embodiments, in order to improve the stability during deceleration, the number of the flyweight assemblies 300 is at least two, and the at least two flyweight assemblies 300 are equidistantly spaced along the circumference of the hub 100. Figure 2 As shown, there are two flyweight assemblies 300, which are symmetrically arranged on the wheel hub 100 with the axis of the wheel hub 100 as the center of symmetry. In particular, when the wheel hub 100 rotates at high speed, the two symmetrical flyweight assemblies 300 can maintain left-right balance and reduce vibration and deviation of the wheel hub 100.

[0044] Please refer again Figure 2 In some embodiments, the wheel hub 100 is further provided with a fixing frame 110, and the reset assembly 500 includes a reset spring 510, with one end of the reset spring 510 connected to the fixing frame 110 and the other end abutting against the flyweight assembly 300. In other embodiments, the reset assembly 500 can also be configured as a coil spring connected to the flyweight assembly 300, and the flyweight assembly 300 is rotated by pulling force.

[0045] It should be noted that when the flyweight assembly 300 is not subjected to centrifugal force, the return spring 510 is in its initial position, abutting against the flyweight assembly 300 and exerting no force. When the flyweight is subjected to centrifugal force, the return spring 510 is compressed and deformed, generating a reverse resistance, attempting to return the flyweight assembly 300 to its initial position. Furthermore, it should be noted that the "reverse resistance" mentioned above is outward along the axis of the return spring 510.

[0046] Furthermore, the reset assembly 500 includes a reset rod 530 that slidably engages with the fixed frame 110. The reset spring 510 is sleeved on the reset rod 530 and abuts against the flyweight assembly 300 via the reset rod 530. As will be readily understood, as the flyweight assembly 300 rotates, the reset rod 530 advances or retreats along a fixed track, transmitting the movement of the flyweight assembly 300. This effectively prevents the flyweight assembly 300 from experiencing unstable movement that could affect its overall performance, while also minimizing motion deviations caused by bending or twisting of the reset spring 510.

[0047] See also Figure 3 To facilitate stable motion transmission among the housing 700, the flyweight assembly 300, and the reset assembly 500, the flyweight assembly 300 includes a first braking portion 310, a second braking portion 350, and a connecting portion 330 connecting the first braking portion 310 and the second braking portion 350. The connecting portion 330 is rotatably connected to the wheel hub 100 and serves as the rotation center of the flyweight assembly 300.

[0048] The first brake portion 310 abuts or connects with the reset assembly 500 and is subjected to the reset force applied by the reset assembly 500. The second brake portion 350 is configured to rotate toward the housing 700 under the action of centrifugal force and collide with the housing 700 when the wheel hub 100 reaches a preset rotational speed. Optionally, the angle between the extension line of the first brake portion 310 and the extension line of the second brake portion 350 is an obtuse angle to facilitate rapid motion transmission and improve braking efficiency.

[0049] To further improve transmission efficiency, the first brake portion 310 is at least partially arc-shaped, and the arc-shaped structure abuts against the reset assembly 500. As will be readily understood, the arc-shaped structure forms a high-pair point contact between the first brake portion 310 and the reset assembly 500. Compared to a low-pair surface contact, the contact area between the first brake portion 310 and the reset assembly 500 is significantly reduced, significantly reducing wear and friction. Due to the reduced friction, the first brake portion 310 can more efficiently transmit motion and force to the reset assembly 500, enabling the reset assembly 500 to respond promptly, balancing centrifugal force when the wheel hub 100 rotates at low speeds and reacting against the wheel hub 100 at high speeds.

[0050] To further improve braking efficiency, the flyweight assembly 300 further includes a counterweight 370 connected to the second braking portion 350. This allows the second braking portion 350 to be subjected to greater centrifugal force during high-speed rotation of the wheel hub 100, making it more likely to collide and rub against the housing 700. Accordingly, considering that methods for increasing centrifugal force include increasing the mass of an object, increasing the rotational speed, and increasing the distance of the object from the center of rotation, the thickness of the second braking portion 350 at the end away from the connecting portion 330 can be increased, thereby increasing both the distance and the mass, thereby increasing the centrifugal force.

[0051] Considering that the distance between the second braking portion 350 and the housing 700 is constant, in some embodiments, the length of the second braking portion 350 can be increased and the distance between the second braking portion 350 and the housing 700 can be shortened to improve the braking efficiency of the flyweight assembly 300. In other embodiments, such as Figure 4 As shown, the collision distance can also be shortened by providing a reduction tooth 710 in the housing 700. Accordingly, the flyweight assembly 300 is configured to rotate toward the reduction tooth 710 under centrifugal force and collide with the reduction tooth 710 when the wheel hub 100 reaches a preset speed. It is easy to understand that when the wheel hub 100 reaches the preset speed, the flyweight assembly 300 continuously collides and rubs against the reduction tooth 710, thereby braking and decelerating the wheel.

[0052] To further increase the probability of collision between the housing 700 and the flyweight assembly 300, a plurality of reduction teeth 710 are provided, each equidistantly spaced along the circumference of the housing 700. In other words, the reduction teeth 710 are arranged in a circular array around the axis of the housing 700, forming a reduction ring. Consequently, when the wheel hub 100 rotates at high speed, collisions between the flyweight assembly 300 and adjacent reduction teeth 710 occur, converting the wheel hub 100's motion into internal energy.

[0053] In order to further increase the collision efficiency between the housing 700 and the flyweight assembly 300, the reduction gear 710 is provided with a first inclined surface 711 at one end close to the flyweight assembly 300, and the flyweight assembly 300 is provided with a second inclined surface 351 that cooperates with the first inclined surface 711. Based on the above arrangement, the collision area between the housing 700 and the flyweight assembly 300 is increased. When the wheel hub 100 rotates at high speed, the first inclined surface 711 and the second inclined surface 351 contact, collide and rub against each other, which can achieve more efficient energy conversion. Optionally, the first inclined surface 711 and the second inclined surface 351 are both made of a material with a certain friction resistance, or a friction-increasing structural layer is provided thereon.

[0054] In addition, it should be noted that the above-mentioned first inclined surface 711 is a tooth-receiving inclined surface, and a tooth-exiting inclined surface can also be correspondingly provided on the opposite side along the circumference of the shell 700 so that the tape can have a smooth transition path when being pulled out.

[0055] Taking the fly hammer type deceleration tape measure 10 provided in this application as an example, its working principle and workflow are as follows:

[0056] When the wheel hub 100 is stationary and the flyweight assembly 300 is not subjected to centrifugal force, the flyweight assembly 300 is in an initial position and maintains a certain distance from the reduction gear 710 .

[0057] When the wheel hub 100 rotates below a predetermined speed, the second brake 350 is flung outward by centrifugal force and approaches the housing 700. The return spring 510 is compressed and deformed, generating a reverse resistance force against the first brake 310. At this point, the first brake 310 and the second brake 350 form a dynamic equilibrium, and the flyweight assembly 300 maintains its position. The wheel hub 100 tends to rotate at a constant speed, and the tape tends to retract at a constant speed.

[0058] When the wheel hub 100 rotates at a speed greater than or equal to a preset speed, the centrifugal force increases, the first braking portion 310 overcomes the reverse resistance of the reset assembly 500, and the second braking portion 350 collides with the reduction gear 710, converting kinetic energy into internal energy, causing the wheel hub 100 to decelerate to a preset speed and eventually tend to recover at a uniform speed.

[0059] In summary, the embodiment of the present invention provides a flyweight type deceleration tape measure 10, comprising a housing 700, a wheel hub 100, a flyweight assembly 300, and a reset assembly 500. The wheel hub 100 is rotatably connected to the housing 700. The flyweight assembly 300 is rotatably connected to the wheel hub 100, and is configured to rotate toward the housing 700 under centrifugal action, and collide with the housing 700 when the wheel hub 100 reaches a preset rotational speed, thereby achieving braking. The reset assembly 500 is connected to the wheel hub 100, and is configured to cause the flyweight assembly 300 to rotate away from the housing 700, thereby forming a braking balance with the reset assembly 500, so that the wheel hub 100 is lower than the preset rotational speed or is maintained at the preset rotational speed. Therefore, the recovery speed of the tape can be maintained at a relatively low speed that will not cut people's hands, thereby achieving safe recovery.

[0060] The above is only a specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any changes or replacements that can be easily thought of by any technician familiar with this technical field within the technical scope disclosed in the present invention should be covered by the protection scope of the present invention.

Claims

1. A fly hammer type deceleration tape measure, characterized in that: include: case; a wheel hub, the wheel hub being rotatably connected to the housing; a flyweight assembly, the flyweight assembly being rotatably connected to the wheel hub and configured to rotate toward the housing under centrifugal action and collide with the housing when the wheel hub reaches a preset rotational speed; A reset assembly is connected to the wheel hub and is used to rotate the flyweight assembly in a direction away from the housing.

2. The flyweight deceleration tape measure according to claim 1, characterized in that: The housing is provided with a reduction gear, and the flyweight assembly is used to rotate toward the reduction gear under the action of centrifugation, and collide with the reduction gear when the wheel hub reaches the preset speed.

3. The flyweight deceleration tape measure according to claim 2, characterized in that: There are multiple reduction teeth, and the multiple reduction teeth are arranged at equal intervals along the circumference of the housing.

4. The flyweight deceleration tape measure according to claim 2, characterized in that: The reduction tooth is provided with a first inclined surface at one end close to the flyweight assembly, and the flyweight assembly is provided with a second inclined surface matching the first inclined surface.

5. The flyweight deceleration tape measure according to any one of claims 1 to 4, characterized in that: The flyweight assembly includes a first braking portion, a second braking portion, and a connecting portion connecting the first braking portion and the second braking portion; The connecting portion is rotationally connected to the wheel hub; the first braking portion is abutted against or connected to the reset assembly; the second braking portion is used to rotate toward the shell under the action of centrifugal force, and collides with the shell when the wheel hub reaches the preset speed.

6. The flyweight deceleration tape measure according to claim 5, characterized in that: At least a portion of the first braking portion is in an arc structure, and the arc structure abuts against the reset assembly.

7. The flyweight deceleration tape measure according to claim 5, characterized in that: The flyweight assembly further includes a counterweight connected to the second braking portion.

8. The flyweight deceleration tape measure according to any one of claims 1 to 4, characterized in that: The wheel hub is further provided with a fixing frame, and the reset assembly includes a reset spring, and one end of the reset spring is connected to the fixing frame, and the other end thereof is abutted against the flyweight assembly.

9. The flyweight deceleration tape measure according to claim 8, characterized in that: The reset assembly further includes a reset rod that is slidably matched with the fixing frame. The reset spring is sleeved on the reset rod and is supported by the fly hammer assembly through the reset rod.

10. The flyweight deceleration tape measure according to any one of claims 1 to 4, characterized in that: The number of the flyweight assemblies is at least two, and the at least two flyweight assemblies are equidistantly spaced along the circumference of the hub.

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