Speed reduction structure for tape measure, tape measure capable of realizing emergency-stop, speed reduction, and safe retraction, tape measure capable of realizing friction-based speed reduction, tape measure capable of realizing noise reduction and speed reduction, adjustable tape measure capable of realizing centrifugal speed reduction, tape measure capable of realizing fly-hammer-based speed reduction, and tape measure capable of realizing stop-position speed-limiting

Abstract

A speed reduction structure for a tape measure, comprising a tape (100), a case (200), a tape measure hub (300), and a winding member (400), wherein the tape measure hub (300) is rotatably arranged inside the case (200); the tape (100) is wound on the tape measure hub (300); the winding member (400) is arranged inside the case (200) and is connected to the tape measure hub (300); the winding member (400) is configured to drive the tape measure hub (300) to rotate and wind the tape (100). The speed reduction structure further comprises: a flywheel plate (500), wherein the flywheel plate (500) is arranged on the tape measure hub (300); and a speed reduction assembly (600), wherein the speed reduction assembly (600) is arranged inside the case (200), and when the tape measure hub (300) rotates, the flywheel plate (500) collides with the speed reduction assembly (600), and the speed reduction assembly (600) buffers and reduces the speed of the tape measure hub (300). Thus, the speed reduction structure for the tape measure has the effect of reducing potential safety hazards during use of a steel tape measure. In addition, also provided are a tape measure capable of realizing emergency-stop, speed reduction, and safe retraction, a tape measure capable of realizing friction-based speed reduction, a tape measure capable of realizing noise reduction and speed reduction, an adjustable tape measure capable of realizing centrifugal speed reduction, a tape measure capable of realizing fly-hammer-based speed reduction, and a tape measure capable of realizing stop-position speed-limiting.

Description

Measuring tape with deceleration structure, emergency stop type deceleration safety retraction measuring tape, friction deceleration measuring tape, noise reduction deceleration measuring tape, adjustable centrifugal deceleration measuring tape, fly hammer type deceleration measuring tape, and stop and speed limit measuring tape.

[0001] Cross-references to related applications

[0002] This application claims priority to Chinese Patent Application No. 2024226579113, filed on October 31, 2024, entitled "Measuring Tape Deceleration Structure"; claims priority to Chinese Patent Application No. 2024115424039, filed on October 31, 2024, entitled "Emergency Stop Type Deceleration Safety Retractable Measuring Tape"; claims priority to Chinese Patent Application No. 2024226542301, filed on October 31, 2024, entitled "A Friction Deceleration Measuring Tape"; and claims priority to Chinese Patent Application No. 2024226647835, filed on October 31, 2024. Priority is claimed to Chinese patent application number 202422655206X, filed on October 31, 2024, entitled "Adjustable Centrifugal Deceleration Measuring Tape"; priority is claimed to Chinese patent application number 202422655206X, filed on October 31, 2024, entitled "A Flying Hammer Deceleration Measuring Tape"; priority is claimed to Chinese patent application number 2024226606106, filed on October 31, 2024, entitled "A Stop-Speed ​​Limiting Measuring Tape"; the entire contents of these patent applications are incorporated herein by reference. Technical Field

[0003] This disclosure relates to the field of measuring tool technology, and more specifically, to a tape measure deceleration structure, a tape measure with emergency stop and deceleration safety recovery, a friction deceleration tape measure, a noise reduction deceleration tape measure, an adjustable centrifugal deceleration tape measure, a fly hammer deceleration tape measure, and a stop-speed limiting tape measure. Background Technology

[0004] Steel tape measures are commonly used measuring tools in daily life and work, serving functions such as length measurement, linear positioning, and as an auxiliary tool. Their working principle involves measuring the object being measured using a graduated tape, and then automatically retracting the tape into the outer casing using the elasticity of a spring.

[0005] During the use of a steel tape measure, the tape is subjected to a large force under the action of the spring when it is retracted, resulting in a high tape retraction speed. The thin and sharp tape has a large kinetic energy, and there is a risk of being cut when a person's hand gets close to the tape, which poses a significant safety hazard during the use of a steel tape measure. Summary of the Invention

[0006] The purpose of this disclosure includes providing a tape measure deceleration structure, a deceleration safety retraction tape measure with emergency stop, a friction deceleration tape measure, a noise reduction deceleration tape measure, an adjustable centrifugal deceleration tape measure, a fly hammer deceleration tape measure, and a stop-speed limiting tape measure, which can reduce safety hazards during the use of steel tape measures.

[0007] The embodiments of this disclosure can be implemented as follows:

[0008] In a first aspect, this disclosure provides a tape measure reduction structure, including a tape measure, a housing, a tape measure hub, and a winding member. The tape measure hub is rotatably disposed within the housing, the tape measure is wound onto the tape measure hub, and the winding member is disposed within the housing and connected to the tape measure hub. The winding member is configured to drive the tape measure hub to rotate and wind up the tape measure. The structure also includes:

[0009] Flywheel plate, the flywheel plate is set on the hub of the measuring tape;

[0010] The deceleration assembly is located inside the housing. When the measuring tape hub rotates, the flywheel plate collides with the deceleration assembly, which buffers and slows down the measuring tape hub.

[0011] Secondly, this disclosure provides a retractable tape measure with emergency stop capability and deceleration, including a housing, a tape hub rotatably disposed within the housing, a tape wound around the tape hub, and a coil spring disposed within the tape hub, and further including:

[0012] The flywheel plate is mounted on the belt hub.

[0013] The limiting component is located inside the housing. When the scale wheel hub rotates, it causes the flywheel plate to collide with the limiting component.

[0014] When the tape wheel hub rotates at a first speed to rewind the tape, the limiting component decelerates the tape wheel hub; when the tape wheel hub rotates at a second speed to rewind the tape, the limiting component restricts the rotation of the tape wheel hub; the first speed is less than the second speed.

[0015] The housing is also equipped with a reset component, which is connected to the limiting component to release the limiting component's restriction on the rotation of the belt hub.

[0016] Thirdly, this disclosure provides a friction-reducing tape measure, comprising:

[0017] A housing, wherein a rotating shaft is disposed within the housing;

[0018] A hub assembly, located within the housing, is sleeved on the pivot and is rotatable around the pivot;

[0019] A deceleration mechanism includes a friction ring and a slider assembly. The friction ring is fixedly disposed within the housing, and the slider assembly is slidably connected to the hub assembly. The slider assembly can move closer to or further away from the friction ring.

[0020] Fourthly, this disclosure provides a noise-reducing and speed-reducing measuring tape, comprising:

[0021] The housing has an inner cavity with a supporting part;

[0022] The damping component is at least partially fitted to the supporting part;

[0023] The hub is located inside the housing and is rotatably connected to the housing;

[0024] The centrifugal component is slidably connected to the hub and is configured to collide with the damping component when the hub rotates at a preset speed.

[0025] Fifthly, this disclosure provides an adjustable centrifugal deceleration tape measure, comprising:

[0026] A housing, wherein a rotating shaft is disposed within the housing;

[0027] A hub assembly, which is located inside the housing, is sleeved on the pivot and can rotate around the pivot;

[0028] A deceleration mechanism, comprising a deceleration ring and a slider, wherein the deceleration ring is fixedly disposed within the housing, and the slider is slidably connected to the hub assembly, and the slider is capable of moving closer to or further away from the deceleration ring;

[0029] An adjustment mechanism is configured to adjust the maximum sliding distance of the slider toward the deceleration ring.

[0030] Sixthly, this disclosure provides a flying hammer type deceleration tape measure, comprising:

[0031] case;

[0032] The hub is rotatably connected to the housing.

[0033] The fly hammer assembly is rotatably connected to the hub and configured to rotate towards the housing under centrifugal force, and to collide with the housing when the hub reaches a preset speed;

[0034] A reset assembly, connected to the hub, is configured to cause the fly hammer assembly to rotate away from the housing.

[0035] Seventhly, this disclosure provides a stop-speed limiting tape measure, comprising:

[0036] Ruler tape;

[0037] The housing has a measuring port configured to slide with the measuring tape;

[0038] The stop element is located at the outlet of the ruler and is rotatably connected to the housing.

[0039] The hub is rotatably connected to the housing and is wound around a measuring tape.

[0040] The centrifugal component is slidably connected to the hub and configured to collide with the stop component when the hub reaches a preset speed, so that the stop component rotates relative to the housing and abuts against it as a belt.

[0041] This disclosure provides a tape measure deceleration structure, a tape measure with emergency stop deceleration safety retraction, a friction deceleration tape measure, a noise reduction deceleration tape measure, an adjustable centrifugal deceleration tape measure, a fly hammer deceleration tape measure, and a stop-speed limiting tape measure. These can, to a certain extent, avoid excessive tape winding speed and excessive kinetic energy during tape winding, reduce the risk of hand cuts during tape winding, and thus reduce safety hazards when using steel tape measures. Attached Figure Description

[0042] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this disclosure and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0043] Figure 1 is a schematic diagram of the tape measure deceleration structure provided in this embodiment;

[0044] Figure 2 is a schematic diagram of the deceleration component in the tape measure deceleration structure provided in this embodiment;

[0045] Figure 3 is a structural schematic diagram of the tape measure deceleration structure provided in some alternative embodiments;

[0046] Figure 4 is an exploded view of the emergency-stop deceleration safety retraction tape measure provided in this embodiment;

[0047] Figure 5 is a schematic diagram of the internal structure of the emergency-stop deceleration safety retraction tape measure provided in this embodiment;

[0048] Figure 6 is an exploded view of the limiting component in the emergency-stop deceleration safety retraction tape measure provided in this embodiment;

[0049] Figure 7 is a schematic diagram of the state of the tape wheel hub when it rotates at the first speed in this embodiment;

[0050] Figure 8 is a schematic diagram of the state of the tape wheel hub when it rotates at the second speed in this embodiment;

[0051] Figure 9 is a schematic diagram of the button structure in the emergency stop-type deceleration safety retraction tape measure provided in this embodiment;

[0052] Figure 10 is a schematic diagram of the tape extension state of the emergency-stopping deceleration safety retraction tape measure provided in this embodiment;

[0053] Figure 11 is an exploded structural diagram of the friction-reducing tape measure provided in this embodiment;

[0054] Figure 12 is an exploded view of the slider assembly provided in this embodiment;

[0055] Figure 13 is a cross-sectional structural diagram of the friction reduction tape measure provided in this embodiment;

[0056] Figure 14 is an enlarged view of part A in Figure 13;

[0057] Figure 15 is a structural schematic diagram of the noise reduction and speed reduction tape measure provided in this embodiment;

[0058] Figure 16 is a partial schematic diagram of the noise reduction and speed reduction tape measure provided in this embodiment;

[0059] Figure 17 is another partial schematic diagram of the noise reduction and speed reduction tape measure provided in this embodiment;

[0060] Figure 18 is another partial schematic diagram of the noise reduction and speed reduction tape measure provided in this embodiment;

[0061] Figure 19 is another partial schematic diagram of the noise reduction and speed reduction tape measure provided in this embodiment;

[0062] Figure 20 is a cross-sectional view of the noise reduction and speed reduction tape measure provided in this embodiment along the AA direction;

[0063] Figure 21 is a cross-sectional view of the noise reduction and speed reduction tape measure provided in this embodiment along the BB direction;

[0064] Figure 22 is an exploded structural diagram of the adjustable centrifugal deceleration tape measure provided in this embodiment;

[0065] Figure 23 is a cross-sectional view of the adjustable centrifugal deceleration tape measure provided in this embodiment;

[0066] Figure 24 is another cross-sectional view of the adjustable centrifugal deceleration tape measure provided in this embodiment.

[0067] Figure 25 is an enlarged view of part A in Figure 23;

[0068] Figure 26 is a schematic diagram of the structural principle of the deceleration ring and slider provided in this embodiment;

[0069] Figure 27 is a structural schematic diagram of the base provided in this embodiment;

[0070] Figure 28 is a structural schematic diagram of the adjustment knob and retaining ring provided in this embodiment;

[0071] Figure 29 is a schematic diagram of the structure of the flying hammer type deceleration tape measure provided in this embodiment;

[0072] Figure 30 is a partial schematic diagram of the flying hammer type deceleration tape measure provided in this embodiment;

[0073] Figure 31 is a schematic diagram of the structure of the flying hammer provided in this embodiment;

[0074] Figure 32 is another partial schematic diagram of the flying hammer type deceleration tape measure provided in this embodiment;

[0075] Figure 33 is a schematic diagram of the overall structure of the stop-speed limiting tape measure provided in this embodiment;

[0076] Figure 34 is a partial structural schematic diagram of the stop-speed limiting tape measure provided in this embodiment;

[0077] Figure 35 is another partial structural schematic diagram of the stop-speed limiting tape measure provided in this embodiment;

[0078] Figure 36 is a structural schematic diagram of the stop member provided in this embodiment;

[0079] Figure 37 is a schematic diagram of the centrifuge component provided in this embodiment;

[0080] Figure 38 is a structural schematic diagram of the locking mechanism provided in this embodiment.

[0081] Icons: 100-measuring tape; 110-measuring hook; 200-outer casing; 300-measuring tape hub; 400-rewinding component; 410-fixed shaft; 420-coil spring; 500-flywheel plate; 600-reduction assembly; 610-impact rib; 611-first inclined plane; 620-reset component; 621-rotating shaft; 622-rotating part; 623-elastic part;

[0082] In another embodiment, the icons in the aforementioned embodiments are not used consecutively, and the labels in Figures 4 to 10 related to this embodiment are renumbered: 100-Housing; 200-Belt hub; 210-Flywheel plate; 300-Belt; 400-Coil spring; 500-Limiting assembly; 510-Return stop; 520-Deceleration rib; 530-First elastic element; 540-Locking rib; 550-Limiting rib; 560-Reinforcing plate; 570-Reset rib; 580-Sloping surface; 600-Reset element; 610-Button; 620-Reset groove; 700-Leg locking element; 710-Clamping section; 720-Transmission section; 730-Second elastic element; 800-Rotating plate; 810-Third elastic element;

[0083] In another embodiment, the icons in the aforementioned embodiments are not used consecutively, and the labels in Figures 11 to 14 related to this embodiment are renumbered: 100-friction reduction tape measure; 10-housing; 11-top cover; 12-base; 13-rotating shaft; 14-locking mechanism; 20-hub assembly; 21-hub; 211-slide groove; 212-guide post; 22-shoulder sleeve; 30-reduction mechanism; 31-friction ring; 311-positioning groove; 312-fixed baffle; 32-slider assembly; 321-slider; 3211-guide hole; 322-reset component; 323-friction block; 3231-countersunk hole;

[0084] In another embodiment, the icons in the aforementioned embodiments are not used consecutively, and the labels in Figures 15 to 21 related to this embodiment are renumbered: 10-Noise-reducing and speed-reducing tape measure; 100-Housing; 110-Supporting part; 130-Limiting part; 131-Positioning groove; 300-Damping element; 310-Collision part; 311-Second inclined surface; 320-Connecting part; 330-Positioning part; 350-Anti-slip part; 400-Connecting member; 500-Hub; 710-Centrifugal element; 711-First inclined surface; 730-Elastic element;

[0085] In another embodiment, the icons in the preceding embodiments are not used consecutively, and the labels in Figures 22 to 28 related to this embodiment are renumbered: 100-Adjustable centrifugal reduction tape measure; 10-Housing; 11-Base; 111-Shaft; 112-Opening; 12-Top cover; 13-Locking mechanism; 20-Hub assembly; 21-Hub; 22-Busset; 23-Slide groove; 24-Guide post; 30-Reduction mechanism; 31-Reduction ring; 311-Reduction protrusion; 3111-First reduction ramp; 3112-First guide 3113-First transition surface; 32-Slider; 321-Guide hole; 322-Reset component; 323-Second deceleration ramp; 324-Second guide ramp; 325-Second transition surface; 326-Slot; 3261-Second adjusting surface; 40-Adjusting mechanism; 41-Snap ring; 411-Second wedge block; 412-First adjusting surface; 4121-Stepped surface; 42-Drive assembly; 421-Adjusting knob; 4211-First wedge block; 43-Helical groove; 422-Fastener; 423-Elastic component;

[0086] In another embodiment, the icons in the aforementioned embodiments are not used consecutively, and the labels in Figures 29 to 32 related to this embodiment are renumbered: 10-flying hammer type reduction tape measure; 100-hub; 110-fixed frame; 300-flying hammer 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;

[0087] In another embodiment, the icons in the foregoing embodiments are not used consecutively, and the labels in Figures 33 to 38 related to this embodiment are renumbered: 10-Stop speed-limiting tape measure; 100-Tap measure; 200-Housing; 210-Tap measure opening; 300-Stop component; 310-First braking part; 311-Second inclined surface; 320-First connecting part; 330-Second braking part; 400-Hub; 510-Centrifugal component; 511-First inclined surface; 530-Elastic component; 600-Tap measure locking component; 610-First supporting part; 620-Second connecting part; 630-Second supporting part; 700-Button; 800-Tap measure opening component; 900-Reset component. Detailed Implementation

[0088] Steel tape measures are common measuring tools in daily life and work. When using them, the operator pulls out the tape, which is marked with graduations, to measure the length of the object being measured, perform straight-line positioning, or use the tape measure as an auxiliary tool. After use, a spring inside the steel tape measure automatically and quickly rewinds the tape back into the casing. Steel tape measures are compact, lightweight, and easy to carry. They are also simple to operate; simply pull out the tape, and it automatically and quickly rewinds back into the casing after use. Therefore, steel tape measures have wide applications in daily life and engineering construction.

[0089] The tape of a steel measuring tape is generally made of steel strip. When the tape is retracted after use, the tape is subjected to a large force under the action of the spring. The tape retracts at an accelerating speed, resulting in a high retraction speed. The thin and sharp tape has a large kinetic energy during retraction, which poses a risk of cuts to the hand when it is close to the tape.

[0090] To address the aforementioned issues, this disclosure provides a tape measure deceleration structure that can decelerate the tape during tape retraction, maintaining a lower speed and reducing the kinetic energy of the tape during retraction. This improves the safety hazard associated with tape retraction.

[0091] The following describes in detail the overall structure, working principle, and technical effects of the tape measure deceleration structure provided in this disclosure through embodiments and in conjunction with the accompanying drawings.

[0092] Please refer to Figures 1 and 2. The tape measure deceleration structure provided in this disclosure is applied inside a steel tape measure and configured to decelerate the tape 100 when the steel tape measure is retracted.

[0093] Referring to Figures 1 to 3, when the measuring tape 100 is pulled out of the measuring tape, the measuring tape 100 drives the measuring tape hub 300 to rotate. At this time, the measuring tape hub 300 rotates counterclockwise as shown in Figures 1 and 3. When the measuring tape 100 is released, the measuring tape hub 300 rotates back under the action of the winding member 400, rotating clockwise as shown in Figures 1 and 3. Based on this, the rotation direction of the measuring tape hub 300 is defined as the rotation direction of the measuring tape hub 300 when winding the measuring tape 100, that is, the clockwise direction as shown in Figures 1 and 3.

[0094] The tape measure reduction structure includes a tape 100, a housing 200, a tape measure hub 300, and a winding component 400. The housing 200 comprises two corresponding hollow shells, which are detachably connected by bolts. The interior of the housing 200 provides installation space for components such as the tape 100. The tape measure hub 300 is rotatably mounted inside the housing 200. The tape 100 is a thin steel strip wound around the outside of the tape measure hub 300. The winding component 400 is installed inside the housing 200 and connected to the tape measure hub 300. The winding component 400 is configured to drive the tape measure hub 300 to rotate, thereby winding the tape 100 back to the outside of the tape measure hub 300. The tape measure reduction structure also includes a flywheel plate 500 and a reduction assembly 600. The flywheel plate 500 is disposed on the tape measure hub 300 and protrudes from the tape measure hub 300. The deceleration assembly 600 is located inside the housing 200. When the measuring tape hub 300 rotates and winds up the measuring tape 100, the flywheel plate 500 rotates with the rotating measuring tape hub 300. During the rotation of the flywheel plate 500, it collides with the deceleration assembly 600. When they collide, the deceleration assembly 600 absorbs energy from the measuring tape hub 300, thereby buffering and decelerating the measuring tape hub 300.

[0095] By incorporating the flywheel plate 500 and the reduction assembly 600, the measuring tape hub 300 collides with the reduction assembly 600 multiple times during rotation. The reduction assembly 600 absorbs and buffers the energy of the measuring tape hub 300, thereby reducing its speed. This helps to prevent the measuring tape 100 from winding too quickly or generating excessive kinetic energy during winding, reducing the risk of hand injuries during winding and thus minimizing safety hazards when using the steel measuring tape.

[0096] Referring to Figure 1, the retractor 400 further includes a fixed shaft 410 and a coil spring 420. The fixed shaft 410 is fixedly mounted on the housing 200 and located at the axis of the housing 200. The measuring tape hub 300 is rotatably mounted on the fixed shaft 410. The coil spring 420 is installed inside the measuring tape hub 300, with its inner end fixedly connected to the fixed shaft 410 and its outer ring fixedly connected to the measuring tape hub 300. When the measuring tape 100 on the measuring tape hub 300 is pulled outward from the housing 200 (i.e., when the measuring tape hub 300 rotates counterclockwise in Figure 1), the coil spring 420 retracts and generates a spring force on the measuring tape hub 300, causing the measuring tape hub 300 to tend to drive the measuring tape 100 to retract (i.e., when the measuring tape hub 300 rotates clockwise in Figure 1).

[0097] Furthermore, a ruler hook 110 is installed at the end of the ruler 100 located outside the outer casing 200. The ruler hook 110 is set perpendicular to the length direction of the ruler 100. On the one hand, the ruler hook 110 makes it easy to attach one end of the ruler 100 to the object to be measured, thereby facilitating the measurement of the object. On the other hand, when the ruler 100 is fully wound up, the ruler hook 110 abuts against the outer casing 200, and the ruler hook 110 can prevent the ruler 100 from being completely wound into the outer casing 200 and unable to be pulled out.

[0098] Referring to Figures 1 and 2, in some optional embodiments, the deceleration assembly 600 includes an impact rib 610 and a reset member 620. The impact rib 610 is rotatably mounted within the housing 200 and located on one side of the measuring tape hub 300. The impact rib 610 extends toward the measuring tape hub 300. When the measuring tape hub 300 rotates, the flywheel plate 500 on the measuring tape hub 300 collides with the impact rib 610. The reset member 620 is disposed within the housing 200 and connected to the impact rib 610. The reset member 620 ensures that the impact rib 610 always has a tendency to rotate toward the measuring tape hub 300.

[0099] When the measuring tape hub 300 rotates, the flywheel plate 500 impacts the impact rib 610, causing the impact rib 610 to rotate. After the flywheel plate 500 rotates and disengages from the impact rib 610, the impact rib 610 is reset by the reset component 620. After the measuring tape hub 300 has rotated one revolution, the flywheel plate 500 collides with the impact rib 610 again. Through repeated collisions and friction between the flywheel plate 500 and the impact rib 610, the kinetic energy of the measuring tape hub 300 continuously decreases, thus achieving a deceleration effect on the measuring tape hub 300.

[0100] Referring to Figures 1 and 2, further, in some optional embodiments, to facilitate the resetting of the impact rib 610, the resetting member 620 includes a rotating shaft 621, a rotating part 622, and an elastic part 623. The rotating shaft 621 is disposed within the housing 200 and located on one side of the measuring tape hub 300, and is arranged parallel to the fixed shaft 410. The rotating part 622 is a hollow cylinder, and is rotatably sleeved on the rotating shaft 621. The impact rib 610 is fixedly disposed on the side of the rotating part 622 and extends toward the measuring tape hub 300. The elastic part 623 is connected to the rotating part 622, and the elastic part 623 ensures that the rotating part 622 always has a tendency to rotate until the impact rib 610 extends toward the measuring tape hub 300.

[0101] Referring to Figures 1 and 2, in some optional embodiments, the elastic part 623 includes a torsion spring. The torsion spring is sleeved and installed outside the rotating shaft 621 and located inside the rotating part 622. A notch is provided on the rotating part 622. One end of the torsion spring is fixedly connected to the rotating shaft 621, and the other end of the torsion spring extends outside the rotating part 622 through the notch. When the torsion spring is in the initial state, the impact rib 610 extends toward the measuring tape hub 300. When the flywheel plate 500 impacts the impact rib 610, the rotating part 622 rotates and drives one end of the torsion spring to rotate, thereby compressing the torsion spring. The torsion spring causes the rotating part 622 to tend to rotate back to its initial position. In other optional embodiments, the elastic part 623 may also be a spring or elastic rubber, etc.

[0102] Furthermore, referring to Figures 1 and 3, to facilitate pulling the measuring tape 100 out of the housing 200, the impact rib 610 has a first inclined surface 611 at the end opposite to the rotation direction of the measuring tape hub 300. The rotation direction of the measuring tape hub 300 is the direction in which the measuring tape hub 300 rotates to wind the measuring tape 100 under the action of the coil spring 420, i.e., clockwise in Figures 1 and 3. Correspondingly, the direction opposite to the rotation direction of the measuring tape hub 300 corresponds to counterclockwise. Specifically, the arc trajectory corresponding to the first inclined surface 611 is tangent to the motion arc of the measuring tape hub 300 during rotation, thereby ensuring that the measuring tape 100 is pulled out smoothly.

[0103] Based on the above, since the impact rib 610 has a first inclined surface 611 at the end opposite to the rotation direction of the measuring tape hub 300, when the tape 100 is pulled out, the measuring tape hub 300 rotates counterclockwise. At this time, the flywheel plate 500 impacts the first inclined surface 611 on the impact rib 610, which facilitates the pulling out of the measuring tape 100. When the measuring tape hub 300 winds up the measuring tape 100, the measuring tape hub 300 rotates clockwise as shown in Figures 1 and 3. At this time, the flywheel plate 500 directly impacts the vertical surface of the impact rib 610, making the deceleration effect of the measuring tape hub 300 when winding up the measuring tape 100 more obvious.

[0104] Furthermore, referring to Figure 3, in some alternative embodiments, a second inclined surface (specifically a chamfer) is also provided on the side of the flywheel plate 500 opposite to the rotation direction of the measuring tape hub 300, so that when the measuring tape 100 is pulled out, the second inclined surface on the flywheel plate 500 and the first inclined surface 611 on the impact rib 610 partially make point contact, line contact, or surface contact, and the displacement of the impact rib 610 is small, making it more convenient to pull out the measuring tape 100.

[0105] Furthermore, referring to Figures 1 and 3, in some optional embodiments, in order to further improve the deceleration effect of the measuring tape hub 300 when retracting the measuring tape belt 100, two flywheel plates 500 are arranged opposite each other on the measuring tape hub 300. The arrangement of the two flywheel plates 500 causes the measuring tape hub 300 to collide with the impact rib 610 twice when it rotates one revolution, thereby improving the transfer effect of kinetic energy of the measuring tape hub 300, and thus improving the deceleration effect when the measuring tape belt 100 is retracted.

[0106] In some alternative embodiments, referring to Figures 1 and 3, at least two impact ribs 610 are spaced apart on the rotating part 622. By providing multiple impact ribs 610, when the rotating part 622 rotates due to the impact of the measuring tape hub 300, the impacted impact rib 610 deflects outside the range of the measuring tape hub 300, while the remaining unimpacted impact ribs 610 rotate within the range of the measuring tape hub 300. This avoids the situation where, when the tape 100 rewinds at too high a speed, a single impact rib 610 is impacted and rotates but cannot return to its original position in time, preventing the subsequent flywheel plate 500 from impacting the impact rib 610, thus ensuring the deceleration effect on the measuring tape hub 300.

[0107] The working principle and process of the tape measure deceleration structure provided in this embodiment are as follows: By setting up a flywheel plate 500, an impact rib 610, and a reset member 620, when the tape measure hub 300 winds up the tape 100, the flywheel plate 500 on the tape measure hub 300 collides with the impact rib 610 multiple times. As the impact rib 610 rotates, the reset member 620 absorbs the energy from the impact, thereby decelerating the tape measure hub 300. This can, to a certain extent, avoid the tape 100 winding speed being too fast and the tape 100 having excessive kinetic energy during winding, reducing the risk of hand cuts during tape 100 winding and thus reducing safety hazards during the use of the steel tape measure.

[0108] In another embodiment, this disclosure provides a retractable tape measure with emergency stop capability and deceleration. It should be noted that the icons in the foregoing embodiments are not used consecutively, and the reference numerals in Figures 4 to 10 related to this embodiment are renumbered.

[0109] Referring to Figures 4 to 10, this emergency-stop deceleration safety retractable measuring tape is configured to decelerate the tape 300 during the retraction process after use, reducing its kinetic energy. Simultaneously, during the retraction process, if the tape 300's speed becomes too high, it is brought to an emergency stop.

[0110] In some alternative embodiments, the retractable tape measure with emergency stop capability includes a housing 100, which comprises an upper housing and a lower housing. The upper and lower housings are interlocked and detachably connected by screws. The housing 100 is hollow. A tape hub 200 is rotatably mounted inside the housing 100 via a rotating shaft. The tape hub 200 is a hollow cylindrical disc with an open top. A coil spring 400 is disposed inside the tape hub 200, with its inner end fixedly connected to the rotating shaft and its outer end fixedly connected to the tape hub 200. A tape 300 is wound around the outside of the tape hub 200, and an opening for the tape 300 to extend is provided on one side of the housing 100.

[0111] Referring to Figures 4 to 10, when the measuring tape 300 is pulled out of the measuring tape, the measuring tape 300 drives the measuring tape hub 200 to rotate. At this time, the measuring tape hub 200 rotates counterclockwise, and the coil spring 400 inside the measuring tape hub 200 is stretched. The coil spring 400 generates an elastic force on the measuring tape hub 200, causing the measuring tape hub 200 to have a tendency to rotate back. When the measuring tape 300 is released, the measuring tape hub 200 rotates back under the action of the coil spring 400, retracting the measuring tape 300 into the housing 100 and winding it onto the measuring tape hub 200. At this time, the measuring tape hub 200 rotates clockwise.

[0112] Based on this, and referring to Figures 4 to 10, the rotation direction of the scale belt hub 200 in this disclosure is clockwise as shown in Figures 4 to 10, and the rotation direction away from the scale belt hub 200 is counterclockwise as shown in Figures 4 to 10.

[0113] Referring to Figures 4 and 5, the emergency-stop deceleration safety retractable tape measure also includes a flywheel plate 210 and a limiting component 500. The flywheel plate 210 is located on one side of the tape hub 200 and protrudes from the hub. The limiting component 500 is located inside the housing 100 near the flywheel plate 210. When the tape hub 200 rotates and retracts the tape 300, the flywheel plate 210 rotates with the hub 200 and periodically collides with the limiting component 500; that is, the flywheel plate 210 collides with the limiting component 500 once for every revolution of the tape hub 200. Furthermore, when the tape hub 200 rotates at a first speed to retract the tape 300, the limiting component 500 decelerates the flywheel plate 210 through impact, thereby decelerating the tape hub 200. When the tape measure hub 200 rotates at a second speed to rewind the tape measure 300, the limiting component 500 limits the rotation of the tape measure hub 200, thereby bringing the tape measure hub 200 to an emergency stop. The second speed is greater than the first speed. Furthermore, a reset component 600 is provided on the housing 100, connected to the limiting component 500. When the limiting component 500 is in the state of limiting the rotation of the tape measure hub 200, the reset component 600 is configured to release the limiting component 500 from restricting the rotation of the tape measure hub 200.

[0114] After the measuring tape is used, when the tape 300 automatically retracts under the action of the coil spring 400, the coil spring 400 drives the tape hub 200 to accelerate, and the tape 300 accelerates. When the tape hub 200 is at the first speed, that is, when the tape hub 200 is rotating at a low speed, the limit component 500 decelerates the tape hub 200 to prevent it from accelerating too quickly. When the tape hub 200 is at the second speed, that is, when the tape hub 200 is rotating at a high speed, the limit component 500 restricts the rotation of the tape hub 200, and the tape hub 200 stops abruptly to prevent it from rotating too quickly. After the tape hub 200 stops abruptly, the rotation restriction of the tape hub 200 can be released by the reset component 600. At this time, the tape hub 200 starts accelerating again from zero under the action of the coil spring 400, and repeats the above deceleration or emergency stop process. This keeps the rotation speed of the tape measure hub 200 at a relatively low speed, resulting in low speed and low kinetic energy of the tape measure 300 during the overall retraction process. This reduces the risk of the tape measure 300 cutting people's hands and thus reduces safety hazards when using the tape measure.

[0115] Referring to Figures 6 and 7, in some optional embodiments, the limiting component 500 includes a return stop 510, a deceleration rib 520, and a first elastic member 530. The return stop 510 is rotatably mounted on the inner wall of the housing 100 via a return stop shaft. In this embodiment, the return stop 510 is a hollow cylindrical tube. In other embodiments, the return stop 510 can also have other shapes, as long as the return stop 510 can rotate within the housing 100 without interfering with other components. The specific shape of the return stop 510 is not limited here. The deceleration rib 520 is fixedly mounted on the return stop 510 and protrudes from the side of the return stop 510. The first elastic member 530 is connected to the return stop 510. When the belt hub 200 drives the flywheel plate 210 to rotate at a first speed, the flywheel plate 210 collides with the deceleration rib 520 during rotation. After being collided, the deceleration rib 520 rotates away from the rotation direction of the belt hub 200 (counterclockwise in Figure 7). The first elastic member 530 is configured to make the return stop member 510 always tend to rotate in the rotation direction of the belt hub 200 (clockwise in FIG7), and in the initial position, the deceleration rib 520 on the return stop member 510 extends toward the belt hub 200 into the motion radius of the flywheel plate 210.

[0116] In some alternative embodiments, the first elastic element 530 is a torsion spring located inside the return member 510. One end of the torsion spring abuts against the return shaft fixed to the housing 100, and the other end of the torsion spring abuts against the return member 510. In other alternative embodiments, the first elastic element 530 may also be an elastic structure such as a spring or elastic rubber.

[0117] When the belt hub 200 rotates at a first speed, the flywheel plate 210 on the belt hub 200 collides with the deceleration rib 520. During the collision, part of the kinetic energy of the belt hub 200 is transferred to the deceleration rib 520. At the same time, part of the kinetic energy of the belt hub 200 is converted into heat energy and used to overcome the friction between the belt hub 200 and the deceleration rib 520, thereby reducing the kinetic energy of the belt hub 200 and decelerating it. After the deceleration rib 520 rotates due to the collision, the first elastic element 530 drives the return stop element 510 to rotate, causing the deceleration rib 520 to return to its original position. After the belt hub 200 has rotated one revolution, the flywheel plate 210 collides with the deceleration rib 520 again, thus achieving the deceleration effect on the belt hub 200.

[0118] Referring to Figures 6 to 8, in some optional embodiments, the limiting component 500 further includes a locking rib 540, which is disposed on the return stop 510 and spaced apart from the deceleration rib 520. A limiting rib 550 is provided on the housing 100, which is located in front of the return stop 510 in the rotation direction (clockwise) of the belt hub 200. When the belt hub 200 rotates, the flywheel plate 210 collides with the deceleration rib 520 and causes the deceleration rib 520 to rotate toward the limiting rib 550. When the belt hub 200 rotates at the second speed, the flywheel plate 210 impacts the deceleration rib 520, causing the return stop 510 to drive the locking rib 540 to rotate toward the limiting rib 550. Since the second speed is greater than the first speed, the rotation angle of the return stop 510 is larger when it collides. When the flywheel plate 210 rotates to face the return stop 510 again, the return stop 510 has not yet been reset in time under the action of the first elastic member 530. At this time, the flywheel plate 210 collides with the side of the locking rib 540 away from the deceleration rib 520 and continues to drive the return stop 510 to rotate toward the limiting rib 550. Until the deceleration rib 520 and the limiting rib 550 abut against each other, and the flywheel plate 210 and the locking rib 540 abut against each other, the limiting rib 550, the deceleration rib 520 and the locking rib 540 work together to restrict the rotation of the tape wheel hub 200, prevent the tape wheel hub 200 from rotating, and achieve the emergency stop effect of the tape wheel hub 200.

[0119] It should be clarified that the return stop 510 rotates when the deceleration rib 520 is impacted by the flywheel plate 210. After rotating, the return stop 510 resets under the action of the first elastic element 530, and the reset of the return stop 510 requires a certain amount of time. At this time, a flywheel plate 210 is provided on the tape wheel hub 200. When the time required for the tape wheel hub 200 to rotate one revolution is greater than the reset time of the return stop 510, the rotational speed of the tape wheel hub 200 is the first speed. When the time required for the tape wheel hub 200 to rotate one revolution is less than the reset time of the return stop 510, the rotational speed of the tape wheel hub 200 is the second speed.

[0120] When the belt hub 200 rotates at the first speed, the angle of motion of the return stop 510 after impact is small, and the reset time of the return stop 510 is short. The return stop 510 can reset within the time it takes for the belt hub 200 to rotate one revolution, thus ensuring that the flywheel plate 210 collides with the deceleration rib 520 when the belt hub 200 rotates. However, when the belt hub 200 rotates at the second speed, the angle of motion of the return stop 510 after impact is large, and the reset time of the return stop 510 is long. At this time, the rotation speed of the belt hub 200 is also faster. When the belt hub 200 rotates one revolution, the return stop 510 has not yet been able to drive the deceleration rib 520 to reset in time. As a result, when the flywheel plate 210 rotates one revolution and passes the return stop 510 again, it will not collide with the deceleration rib 520, but will collide with the locking rib 540, thereby holding the deceleration rib 520 against the limiting rib 550, achieving an emergency stop for the belt hub 200.

[0121] Referring to Figure 6, further, the deceleration rib 520 and the locking rib 540 will be subjected to a large impact force under the impact of the flywheel plate 210. In order to improve the overall structural strength of the limiting component 500 and extend the service life of the limiting component 500, in some optional embodiments, a reinforcing plate 560 is connected between the deceleration rib 520 and the locking rib 540 to improve the structural strength between the deceleration rib 520 and the locking rib 540.

[0122] Referring to Figures 6 to 8, further, the side of the deceleration rib 520 and the locking rib 540 facing the rotation direction of the belt hub 200 is set as a plane. That is, when the belt hub 200 rotates, the side of the flywheel plate 210 that collides with the deceleration rib 520 and the locking rib 540 is a plane. This makes the effective collision range between the flywheel plate 210 and the deceleration rib 520 and the locking rib 540 larger.

[0123] Referring to Figures 7 to 9, at least one flywheel plate 210 is provided on the belt hub 200. In some optional embodiments, two flywheel plates 210 are provided opposite to each other on the belt hub 200. In this case, the two flywheel plates 210 are located on the same diameter of the belt hub 200. Thus, when the belt hub 200 rotates one revolution, the deceleration rib 520 collides with both flywheel plates 210 once, thereby further improving the effect of reducing the kinetic energy of the belt hub 200, and thus improving the deceleration effect of the belt 300.

[0124] It should be clarified that when the tape wheel hub 200 is equipped with two flywheel plates 210, and the time required for the tape wheel hub 200 to rotate half a revolution is greater than the reset time of the return stop 510, the rotational speed of the tape wheel hub 200 is the first speed. When the time required for the tape wheel hub 200 to rotate half a revolution is less than the reset time of the return stop 510, the rotational speed of the tape wheel hub 200 is the second speed.

[0125] Referring to Figures 4 to 10, the reset component 600 includes a button 610, which is rotatably mounted inside the housing 100. The button 610 has a protrusion that penetrates the housing 100 and extends beyond it. A reset rib 570 is provided on the stop component 510, protruding from its edge and offset from the deceleration rib 520 and locking rib 540 along the thickness of the housing 100. A reset groove 620 is formed on the button 610 opposite to the reset rib 570, with the reset rib 570 located within the groove and having a gap between it and the sidewall of the groove 620. When the limiting component 500 restricts the rotation of the belt hub 200, pressing the button 610 towards the housing 100 causes the button 610 to rotate until it abuts against the side wall of the reset groove 620 and the reset rib 570. This then drives the return stop 510 to rotate in the rotation direction of the belt hub 200 (clockwise). This causes the deceleration rib 520 to rotate until it disengages from the limiting rib 550, allowing the belt hub 200 to accelerate back to zero speed. This achieves an emergency stop state that facilitates contact with the belt hub 200, allowing the belt hub 200 to rotate again and rewind the belt 300.

[0126] Referring to Figures 4 and 5, in order to secure the extended tape 300 during use, in some optional embodiments, a locking element 700 is rotatably disposed within the housing 100. The locking element 700 includes a clamping section 710 and a transmission section 720. The rotation axis of the locking element 700 is located at the connection between the clamping section 710 and the transmission section 720, and the included angle between the clamping section 710 and the transmission section 720 is greater than 90°. The end of the clamping section 710 abuts against the tape 300, and the end of the transmission section 720 abuts against the side of the button 610 facing inwards from the housing 100. A second elastic element 730 is also disposed within the housing 100, located between the housing 100 and the clamping section 710. The second elastic element 730 is configured to press the clamping section 710 against the tape 300, thereby securing the tape 300. When winding up the tape 300, pressing button 610 drives the locking member 700 to rotate, causing the clamping section 710 to disengage from the tape 300. The tape 300 then automatically winds up under the action of the coil spring 400. To continue pulling out the tape 300, press button 610 and continue pulling out the tape 300. In this embodiment, the second elastic element 730 is a spring sheet. In other embodiments, the second elastic element 730 can also be a torsion spring, a spring, elastic rubber, or other elastic structures.

[0127] It should be clarified that, due to the certain gap between the reset rib 570 on the return stop 510 and the side wall of the reset groove 620 on the button 610, when the button 610 is pressed lightly, the button 610 drives the locking scale 700 to rotate and releases the fixing of the scale 300. However, at this time, the reset rib 570 is still located in the reset groove 620 and is not in contact with the button 610. When the button 610 is pressed lightly, the scale 300 is released, and the scale 300 automatically rewinds, without affecting the deceleration or emergency stop of the scale 300 by the return stop 510.

[0128] By setting the limit component 500, the tape wheel hub 200 is configured to decelerate when rotating, thereby controlling the rewinding speed of the tape 300. However, when the tape 300 is pulled out for use, the tape wheel hub 200 will also collide with the deceleration rib 520, resulting in a strong jerking sensation when the tape 300 is pulled out, and making it difficult to pull out.

[0129] Based on this, referring to Figures 6 and 10, in some optional embodiments, the side of the deceleration rib 520 and the locking rib 540 facing away from the rotation direction of the belt hub 200 is set as an inclined surface 580. Simultaneously, the side of the flywheel plate 210 facing away from the rotation direction of the belt hub 200 is chamfered, and the chamfer of the flywheel plate 210 adapts to the inclined surface 580 on the deceleration rib 520 and the locking rib 540. Thus, when the belt 300 is pulled out (the belt hub 200 rotates counterclockwise), the chamfer on the flywheel plate 210 collides with the inclined surface 580 on the deceleration rib 520, resulting in a small effective contact area and a short contact time between the flywheel plate 210 and the deceleration rib 520. This facilitates pulling the belt 300 out of the housing 100 and reduces the jerking sensation when pulling out the belt 300.

[0130] Referring to Figure 10, in some optional embodiments, a rotating plate 800 is rotatably disposed within the housing 100, and a third elastic member 810 is disposed within the housing 100. The third elastic member 810 causes the end of the rotating plate 800 to abut against the side of the locking rib 540 away from the deceleration rib 520. The rotating plate 800 is configured to lock the initial angle of the return stop member 510, and when the tape 300 is pulled out (the tape hub 200 rotates counterclockwise), the rotating plate 800 can quickly reset the return stop member 510. In this embodiment, the third elastic member 810 is a spring sheet; in other embodiments, the third elastic member 810 can also be a torsion spring, a spring, elastic rubber, or other elastic structure.

[0131] The working principle of this emergency-stop deceleration safety retractable measuring tape is as follows: When the tape hub 200 rotates at a first speed to retract the tape 300, the flywheel plate 210 on the tape hub 200 collides with the deceleration rib 520, reducing the kinetic energy of the tape hub 200 and thus decelerating the tape 300. When the tape hub 200 retracts the tape 300 at a second speed, after the flywheel plate 210 collides with the deceleration rib 520, the flywheel plate 210 rotates one revolution and then collides with the locking rib 540, holding the deceleration rib 520 against the limiting rib 550. The return stop 510 is locked, causing the tape hub 200 to stop abruptly. This achieves the effect of decelerating the tape 300 at low speeds and stopping it abruptly at high speeds, reducing the retraction speed of the tape 300, reducing safety hazards during tape 300 retraction, and improving the safety of the measuring tape during use.

[0132] In another embodiment, in addition to the measuring tape with a collision and limiting deceleration mechanism described in the foregoing embodiments, this disclosure also provides a measuring tape that utilizes centrifugal force generated during rotation for collision and friction deceleration. It should be noted that the icons in the foregoing embodiments are not used consecutively, and the reference numerals in Figures 11 to 14 related to this embodiment are renumbered.

[0133] Please refer to Figures 11 to 14. This disclosure provides a friction reduction type tape measure 100, which includes a housing 10, a hub assembly 20, and a reduction mechanism 30.

[0134] A rotating shaft 13 is disposed within the housing 10. The housing 10 is configured to accommodate the hub assembly 20 and the reduction mechanism 30. Specifically, in this embodiment, the housing 10 includes a base 12 and a top cover 11. The rotating shaft 13 is fixedly mounted on the base 12.

[0135] The hub assembly 20 is located within the housing 10. The hub assembly 20 is sleeved on the pivot 13 and is rotatable about the pivot 13. It is understood that the hub assembly 20 is configured to mount a measuring tape. The measuring tape is wound around the hub assembly 20. Furthermore, the hub assembly 20 is also provided with a coil spring (not shown) configured to drive the measuring tape to retract. The housing 10 is also provided with a locking mechanism 14 configured to secure the measuring tape.

[0136] When measurement is required, the measuring tape is pulled out and secured by the locking mechanism 14 on the housing 10, thus enabling measurement. When the measuring tape is retracted, the locking mechanism 14 is released, and the hub assembly 20 rotates under the action of the coil spring, thereby pulling the measuring tape back into the housing 10.

[0137] To reduce the tape retraction speed, the friction-deceleration tape measure 100 of this embodiment also includes a deceleration mechanism 30. The deceleration mechanism 30 includes a friction ring 31 and a slider assembly 32. The friction ring 31 is fixedly disposed within the housing 10. The slider assembly 32 is slidably connected to the hub assembly 20, and the slider assembly 32 can move closer to or further away from the friction ring 31.

[0138] Specifically, the friction ring 31 is fixed to one side of the hub assembly 20. The friction ring 31 is annular. The slider assembly 32 is located on the side of the hub assembly 20 close to the friction ring 31 and is located inside the friction ring 31. The center line of the friction ring 31 coincides with the axis of the rotating shaft 13.

[0139] Understandably, when the tape is being retrieved, the hub assembly 20 rotates, and the slider assembly 32 moves outward relative to the hub assembly 20 under centrifugal force, that is, it moves closer to the friction ring 31. When the slider assembly 32 comes into contact with the friction ring 31, friction occurs, and the hub assembly 20 reduces its rotational speed under the action of friction, thereby reducing the tape retrieval speed and preventing the high-speed moving tape from cutting the user's hand.

[0140] Furthermore, the slider assembly 32 includes a slider 321. A groove 211 is provided on the hub assembly 20. The slider 321 slides within the groove 211. A reset member 322 is provided between the slider 321 and the hub assembly 20. The reset member 322 is configured to move the slider 321 away from the friction ring 31. It is understood that when the hub assembly 20 rotates at a low speed, or when the belt retraction is complete, the reset member 322 is configured to move the slider 321 away from the friction ring 31. When the hub assembly 20 rotates at a high speed, the force exerted by the reset member 322 on the slider 321 is insufficient to overcome the centrifugal force of the slider 321, and the slider 321 gradually moves closer to the friction ring 31.

[0141] Optionally, in this embodiment, the slide groove 211 is along a direction perpendicular to the rotating shaft 13. In other embodiments, the slide groove 211 may be set at an angle to the direction perpendicular to the rotating shaft 13. As long as the slider assembly 32 can approach or move away from the friction ring 31 and can abut against the friction ring 31, this disclosure is not limited in this respect.

[0142] Furthermore, to prevent the slider 321 from dislodging from the groove 211, a guide hole 3211 is provided on the slider 321. A guide post 212 that mates with the guide hole 3211 is provided in the groove 211. Specifically, the extending directions of the guide post 212 and the guide hole 3211 are consistent with the extending direction of the groove 211. In this embodiment, the extending directions of the guide post 212 and the guide hole 3211 are perpendicular to the direction of the rotating shaft 13 to ensure that the slider 321 will not dislodge from the groove 211 and to prevent the slider 321 from misaligning with the friction ring 31.

[0143] Specifically, in this embodiment, the reset member 322 is a spring. The spring is sleeved on the guide post 212 and located inside the guide hole 3211. One end of the spring abuts against the bottom surface of the guide hole 3211, and the other end of the spring abuts against the guide post 212.

[0144] In other embodiments, the reset member 322 can be located in other positions, such as outside the guide hole 3211, as long as the reset member 322 is located between the slider 321 and the hub assembly 20.

[0145] Furthermore, the slider assembly 32 also includes a friction block 323. The friction block 323 is fixedly connected to the end of the slider 321 near the friction ring 31. The side of the friction block 323 near the friction ring 31 is provided with a curved surface corresponding to the inner wall of the friction ring 31. It can be understood that when the hub assembly 20 rotates, the curved surface of the friction block 323 can completely abut against the inner wall of the friction ring 31, thereby increasing the contact area and increasing the friction force.

[0146] Furthermore, the friction block 323 and the slider 321 are detachably connected. It is understood that the friction block 323 and the friction ring 31 are prone to wear; the detachable connection between the friction block 323 and the slider 321 facilitates the removal and replacement of the friction block 323. Specifically, in this embodiment, the friction block 323 and the slider 321 are connected by screws. A countersunk hole 3231 is provided on the friction block 323, and the screw head is located within the countersunk hole 3231. It is understood that this ensures that when the friction block 323 wears, the screw head will not contact the friction ring 31.

[0147] In this embodiment, the thickness of the friction ring 31 along the direction perpendicular to its centerline (i.e., radial thickness) gradually increases and then decreases along the direction parallel to the centerline (i.e., axial direction). That is to say, the radial thickness of the friction ring 31 changes continuously along its axial direction, gradually thickening from one end, reaching its maximum value in the middle, and then gradually thinning. Specifically, the inner wall of the friction ring 31 gradually approaches and then moves away from the friction block 323 along its centerline.

[0148] Therefore, the friction ring 31 has a structure that is thicker in the middle and thinner at both ends. When the measuring tape retracts the tape, the hub assembly 20 rotates. Under the action of centrifugal force, the slider assembly 32 drives the friction block 323 to be thrown outward, contacting and generating friction with the thicker part in the middle of the friction ring 31 (i.e., the area with a smaller inner diameter). Because this area is thicker, it has higher wear resistance and structural strength, which can prevent the friction block 323 from wobbling up and down during the friction process, resulting in uneven friction depth, which in turn leads to misaligned friction and causes the hub assembly 20 to wobble up and down.

[0149] To secure the friction ring 31, a fixing baffle 312 is provided on one side of the friction ring 31. The other side of the friction ring 31 is fixedly connected to the inner wall of the housing 10. It can be understood that the friction ring 31 is fixed relative to the housing 10. The fixing baffle 312 is configured to restrict the movement of the friction ring 31 along its centerline.

[0150] Furthermore, a positioning groove 311 is provided on the side of the friction ring 31 near the inner wall of the housing 10. Positioning posts that mate with the positioning groove 311 are provided on the inner wall. Specifically, in this embodiment, there are multiple positioning grooves 311 and positioning posts. The positioning grooves 311 are spaced apart circumferentially along the friction ring 31. The positions of the positioning posts correspond to the positioning grooves 311. It can be understood that the positioning grooves 311 and positioning posts are configured to prevent the friction ring 31 from rotating around its centerline, thus avoiding a decrease in the frictional force between the friction ring 31 and the friction block 323.

[0151] Alternatively, in other embodiments, the positioning post may be disposed on the friction ring 31 and oriented towards the housing 10. The positioning groove 311 may be on the housing 10. It is only necessary to ensure that the friction ring 31 does not rotate.

[0152] To facilitate the installation and removal of the hub assembly 20 and the slider assembly 32, the hub assembly 20 includes a hub 21 and a bushing 22. The bushing 22 is fitted onto the rotating shaft 13. The hub 21 and the bushing 22 are fixedly connected by screws. In this embodiment, a groove 211 is formed on the hub 21. When the bushing 22 is fixedly connected to the hub 21, the bushing 22 blocks the sliding area of ​​the groove 211, preventing the slider 321 from sliding out. When it is necessary to remove the slider 321, the bushing 22 and the hub 21 must be separated first, and then the slider 321 can be pulled off the guide post 212.

[0153] The beneficial effects of the friction-reduction type measuring tape 100 provided in this embodiment are:

[0154] The friction-reduction tape measure 100 disclosed herein includes a housing 10, a hub assembly 20, and a reduction mechanism 30. A rotating shaft 13 is disposed within the housing 10. The hub assembly 20 is located within the housing 10. The hub assembly 20 is sleeved on the rotating shaft 13 and is rotatable around the rotating shaft 13. The hub assembly 20 is configured to mount the tape. The reduction mechanism 30 includes a friction ring 31 and a slider assembly 32. The friction ring 31 is fixedly disposed within the housing 10. The slider assembly 32 is slidably connected to the hub assembly 20, and the slider assembly 32 can move closer to or further away from the friction ring 31. This friction-reduction tape measure 100 utilizes the slider assembly 32 slidably disposed on the hub assembly 20. When the tape retracts, the hub assembly 20 rotates, and the slider assembly 32 moves towards the friction ring 31 under centrifugal force. When the slider assembly 32 abuts against the friction ring 31, the hub assembly 20 reduces its rotational speed under frictional force, thereby reducing the tape retraction speed. This friction-reducing tape measure 100 can reduce the tape retraction speed during the tape retraction process, preventing the tape from cutting the user's hand and improving safety performance.

[0155] In another embodiment, considering that the impact generated by centrifugal force may bring significant noise and vibration, thereby affecting the user experience, this disclosure also provides a speed-reducing tape measure with noise reduction function. It should be noted that the icons in the foregoing embodiments are not used consecutively, and the labels in Figures 15 to 21 related to this embodiment are renumbered.

[0156] Please refer to Figures 15 to 17. This disclosure provides a noise reduction and speed reduction tape measure 10, which includes a housing 100, a damping element 300, a hub 500, and a centrifugal element 710.

[0157] The housing 100 has an inner cavity with a supporting portion 110, and the damping member 300 is at least partially fitted to the supporting portion 110. Therefore, the supporting portion 110 can guide and support the damping member 300. It is easy to understand that through specific shape or position design, it can be ensured that the damping member 300 can fit correctly with the supporting portion, thereby ensuring that the damping member 300 can effectively perform its function.

[0158] Based on the above, the hub 500 is located inside the housing 100 and is rotatably connected to the housing 100; the centrifugal component 710 is slidably connected to the hub 500 and configured to collide with the damping component 300 when the hub 500 reaches a preset rotational speed. That is to say, the centrifugal component 710, through its slidable connection, can automatically adjust its position according to centrifugal force as it rotates with the hub 500. When the hub 500 reaches the preset rotational speed, the centrifugal component 710 will move and contact the damping component 300.

[0159] It should be noted that the damping element 300 significantly reduces vibration and noise in the system by absorbing and converting energy, thereby improving the user experience. Specifically, the high elasticity of the damping element 300 allows it to absorb a large amount of energy upon impact and convert it into elastic potential energy and heat energy, rather than directly transmitting it as vibration. Furthermore, it allows it to release energy in stages to effectively prevent the transmission of vibration, rather than releasing it instantaneously. Based on this, vibration transmission is reduced, and noise is lowered.

[0160] Considering the deformation effect of rubber and its higher coefficient of friction compared to plastic, the damping element 300 can be made of rubber in this application. This allows for greater frictional resistance and a longer residence time during the impact with the centrifugal element 710, while ensuring noise reduction and vibration damping, thereby further reducing the deceleration effect during tape retraction. In other embodiments, the damping element 300 can also be made of other materials; this application does not limit its use.

[0161] Additionally, it should be noted that the preset rotation speed in this application refers to a rotation speed that could easily cause injury or cuts to the user. At speeds below the preset speed, the retraction or extension of the measuring tape is unaffected. Based on this, in some embodiments, the noise-reducing and speed-reducing measuring tape 10 also includes an elastic element 730, one end of which is connected to the hub 500, and the other end to the centrifugal element 710.

[0162] Understandably, when the rotational speed of the hub 500 is less than the preset speed, the tension of the elastic element 730 is greater than the centrifugal force on the centrifugal element 710, causing the centrifugal element 710 to remain relatively stationary on the hub 500, and the measuring tape to retract smoothly or be pulled out. When the rotational speed of the hub 500 is greater than the preset speed, the tension of the elastic element 730 is less than the centrifugal force on the centrifugal element 710, causing the centrifugal element 710 to slide relative to the hub 500 and collide with the damping element 300, resulting in the measuring tape decelerating and retracting.

[0163] Optionally, the elastic element 730 in this application can be a return spring, and the centrifugal element 710 can be a metal wedge. When the hub 500 rotates at a speed greater than a preset speed, the centrifugal element 710 overcomes the spring force and slides along the spring axis in a direction away from the axis of the hub 500. During the above process, the metal wedge has a certain weight, which further increases the centrifugal effect.

[0164] In some embodiments, as shown in Figure 16, the centrifugal component 710 has a first inclined surface 711 near the damping component 300, and correspondingly, the damping component 300 has a second inclined surface 311 that cooperates with the first inclined surface 711. It is easy to understand that when the hub 500 reaches a preset rotational speed, based on the arrangement of the first inclined surface 711 and the second inclined surface 311, the contact area between the centrifugal component 710 and the damping component 300 is larger, the collision frequency is higher, and the friction effect is more significant, thereby effectively reducing the retraction speed of the hub 500.

[0165] Referring to Figures 18 to 21, since the damping member 300 tends to detach from the supporting portion 110 during high-frequency impact, in some embodiments, the damping member 300 includes an interconnected collision portion 310 and a positioning portion 330. The positioning portion 330 is connected to the housing 100, and the collision portion 310 is correspondingly fitted to the supporting portion 110. Based on this connection, sufficient tensile and shear strength are provided without affecting the function of the damping member 300, ensuring that the damping member 300 will not loosen or detach during high-frequency impact.

[0166] To further improve the impact resistance of the damping element 300, two positioning parts 330 are provided, each connected to one of the opposite ends of the impact part 310. Furthermore, considering that the impact part is prone to large tangential stress during high-frequency impacts, both positioning parts 330 extend circumferentially along the housing 100 to improve the fixation of the damping element 300 in the tangential direction of the housing 100.

[0167] Referring to Figures 16 and 20, to improve the fixation of the damping member 300 in the axial direction of the housing 100, a limiting part 130 is also provided in the inner cavity of the housing 100. The limiting part 130 and the supporting part 110 are spaced apart along the circumference of the housing 100. Furthermore, the limiting part 130 has a positioning groove 131 that mates with the positioning part 330, so that the positioning part 330 can be firmly embedded therein, reducing axial displacement caused by high-frequency impact.

[0168] To further optimize the design of the damping member 300, the distance between the limiting part 130 and the supporting part 110 can be used to position the damping member 300. Specifically, the damping member 300 also includes a connecting part 320, which is located between the limiting part 130 and the supporting part 110, and the impact part 310 is connected to the positioning part 330 through the connecting part 320. It is easy to understand that the connecting part 320 is sandwiched between the limiting part 130 and the supporting part 110, thereby further enhancing the stability of the damping member 300 and preventing it from displacing during high-frequency impacts.

[0169] To optimize space utilization and enhance the stability of the damping component 300, it also includes an anti-slip part 350. The anti-slip part 350 is located on the outside of the housing 100 and is connected to both the positioning part 330 and the collision part 310, forming an integral structure. Based on this configuration, the anti-slip part 350 increases the contact area and friction between the damping component 300 and the housing 100, further preventing the damping component 300 from sliding during high-frequency impacts, thereby improving the overall structural strength and stability.

[0170] Referring again to Figure 16, in some embodiments, to improve the effectiveness of vibration damping and noise reduction, the number of abutment portions 110 is at least two, and the at least two abutment portions 110 are arranged at circumferential intervals along the housing 100. Based on this, the damping member 300 corresponds one-to-one with the abutment portion 110, that is, their positions and numbers correspond one-to-one, to ensure that the kinetic energy of the centrifugal member 710 is always absorbed by the damping member 300.

[0171] Furthermore, as shown in Figure 19, the noise-reducing and speed-reducing measuring tape 10 also includes a connector 400. All damping elements 300 are connected through the connector 400 to ensure that they remain in a fixed position during high-frequency impacts, thereby improving the overall structural strength and stability. To reduce manufacturing costs and simplify the production process, the connector 400 can be made of elastic silicone, has a ring structure, is fitted onto the outer periphery of the housing 100, and is fixedly connected to multiple damping elements 300.

[0172] In one embodiment, the damping element 300 and the connecting element 400 are made of the same material (such as elastic silicone) and are manufactured as an integral structure by a one-piece injection molding process; in other embodiments, the connecting element 400 can also be fixedly connected to each damping element 300 by adhesive bonding.

[0173] In summary, this disclosure provides a noise-reducing and speed-reducing tape measure 10, which includes a housing 100, a damping element 300, a hub 500, and a centrifugal element 710. The housing 100 has an inner cavity with a supporting portion 110, and the damping element 300 is at least partially fitted to the supporting portion 110. Therefore, the supporting portion 110 provides guidance and support for the damping element 300. The hub 500 is located within the housing 100 and is rotatably connected to it; the centrifugal element 710 is slidably connected to the hub 500 and configured to collide with the damping element 300 when the hub 500 reaches a preset rotational speed. It is understood that the damping element 300, by absorbing and converting energy, can significantly reduce vibration and noise in the system, improving the user experience. Therefore, the noise-reducing and speed-reducing tape measure 10 provided by this disclosure reduces vibration transmission, lowers noise, and improves the user experience.

[0174] In another embodiment, to further achieve adjustability of the tape retraction speed, this disclosure also provides an adjustable centrifugal deceleration tape measure. It should be noted that the icons in the foregoing embodiments are not used consecutively, and the reference numerals in Figures 22 to 28 related to this embodiment are renumbered.

[0175] Please refer to Figures 22, 23 and 25. This disclosure provides an adjustable centrifugal reduction tape measure 100, which includes a housing 10, a hub assembly 20, a reduction mechanism 30 and an adjustment mechanism 40.

[0176] A rotating shaft 111 is disposed inside the housing 10. The housing 10 is configured to accommodate the hub assembly 20 and the reduction mechanism 30. The housing 10 includes a top cover 12 and a base 11. The rotating shaft 111 is fixedly mounted on the base 11.

[0177] The hub assembly 20 is located within the housing 10. The hub assembly 20 is fitted onto the rotating shaft 111 and can rotate around the shaft 111. It is understood that the hub assembly 20 is configured to mount a measuring tape, which is wound around the hub assembly 20. When the measuring tape is pulled out, it causes the hub assembly 20 to rotate. To retract the measuring tape, the hub assembly 20 is driven by a coil spring. The coil spring drives the hub assembly 20 to rotate, thereby retracting the measuring tape. A locking mechanism 13 is also provided on the housing 10 to secure the measuring tape.

[0178] Specifically, the hub assembly 20 includes a hub 21 and a bushing 22. The bushing 22 is fitted onto the rotating shaft 111 and is rotatable around the rotating shaft 111. The bushing 22 and the hub 21 are fixedly connected. The hub 21 is configured to mount a belt.

[0179] The reduction mechanism 30 includes a reduction ring 31 and a slider 32. The reduction ring 31 is fixedly disposed within the housing 10. The slider 32 is slidably connected to the hub assembly 20. The slider 32 can move closer to or further away from the reduction ring 31. Specifically, the slider 32 is slidably connected to the hub 21. It can be understood that the reduction ring 31 is disposed on one side of the hub 21, and the centerline of the reduction ring 31 coincides with the rotation centerline of the hub 21. The slider 32 is installed on the side of the hub 21 closest to the reduction ring 31 and is located within the reduction ring 31. When the hub 21 rotates, the slider 32 moves outward from the hub 21 under centrifugal force, thereby approaching the reduction ring 31. When the slider 32 contacts the reduction ring 31, the reaction force of the reduction ring 31 on the slider 32 can reduce the rotational speed of the hub 21, thereby reducing the belt retraction speed.

[0180] Furthermore, a groove 23 is provided on the hub assembly 20. Specifically, the groove 23 is provided on the hub 21. The slider 32 slides in conjunction with the groove 23. A reset member 322 is provided between the slider 32 and the hub assembly 20. The reset member 322 is configured to move the slider 32 away from the reduction ring 31 and then reset. It can be understood that when the rotational speed of the hub assembly 20 is low, or when the belt retraction is complete, the reset member 322 is configured to move the slider 32 away from the reduction ring 31 and then reset. When the rotational speed of the hub assembly 20 is high, the force exerted by the reset member 322 on the slider 32 is insufficient to overcome the centrifugal force of the slider 32, and the slider 32 gradually moves closer to the reduction ring 31.

[0181] Optionally, in this embodiment, the slide groove 23 is arranged in a direction perpendicular to the rotating shaft 111, i.e., radially along the hub 21, so that the slider 32 moves radially along the hub 21. In other embodiments, the slide groove 23 may be arranged at an angle to the direction perpendicular to the rotating shaft 111. As long as the slider 32 can approach or move away from the deceleration ring 31 and can abut against the deceleration ring 31, this disclosure is not limited in this respect.

[0182] Furthermore, to prevent the slider 32 from dislodging from the groove 23, a guide hole 321 is provided on the slider 32. A guide post 24 that mates with the guide hole 321 is provided in the groove 23. Specifically, the extending directions of the guide post 24 and the guide hole 321 are consistent with the extending direction of the groove 23. In this embodiment, the extending directions of the guide post 24 and the guide hole 321 are perpendicular to the direction of the rotating shaft 111 to ensure that the slider 32 will not dislodge from the groove 23 and to prevent the slider 32 from misaligning with the deceleration ring 31.

[0183] Specifically, in this embodiment, the reset member 322 is a spring. The spring is sleeved on the guide post 24 and located inside the guide hole 321. One end of the spring abuts against the bottom surface of the guide hole 321, and the other end of the spring abuts against the guide post 24.

[0184] Please refer to Figure 26. Specifically, deceleration protrusions 311 are spaced apart on the inner wall of the deceleration ring 31. A first deceleration ramp 3111 is provided on the deceleration protrusion 3111. A second deceleration ramp 323 is provided at the end of the slider 32 near the deceleration ring 31. The first deceleration ramp 3111 is inclined tangentially relative to the deceleration ring 31. When the hub assembly 20 rotates around the first direction and the slider 32 approaches and abuts against the deceleration ring 31, the first deceleration ramp 3111 and the second deceleration ramp 323 are in contact. The first direction mentioned above is the rotation direction of the hub assembly 20 when the belt is retracted. It can be understood that when the hub assembly 20 rotates around the first direction, the rotation speed of the hub 21 increases under the action of the coil spring, so that the centrifugal force on the slider 32 overcomes the tension of the reset member 322, and the slider 32 gradually moves closer to the deceleration ring 31. When the slider 32 collides with the deceleration protrusion 311, the first deceleration ramp 3111 and the second deceleration ramp 323 are in contact. The slider 32 continues to rotate under the action of the hub 21, causing the first deceleration ramp 3111 and the second deceleration ramp 323 to rub against each other.

[0185] As shown in Figure 26, the frictional force on slider 32 is f. The pressure from deceleration protrusion 311 on slider 32 is N. The resultant force of the tangential components of f and N along the rotation direction of slider 32 is F1. The resultant force of the components of f and N along the sliding direction of slider 32 is also F1. Force F1 causes slider 32 to decelerate, thereby causing hub 21 to decelerate and reducing the belt retraction speed. Force F2 causes slider 32 to move inward along the sliding direction, causing slider 32 to misalign with deceleration protrusion 311, preventing slider 32 from jamming with deceleration protrusion 311.

[0186] Furthermore, a first guide slope 3112 is also provided on the deceleration protrusion 311. A second guide slope 324 is also provided at the end of the slider 32 near the deceleration ring 31. The first guide slope 3112 is inclined tangentially relative to the deceleration ring 31 and is in the opposite direction to the inclination of the first deceleration slope 3111. It can be understood that the deceleration protrusion 311 is a wedge-shaped protrusion. When the hub assembly 20 rotates around the second direction and the slider 32 approaches and abuts against the deceleration ring 31, the first guide slope 3112 and the second guide slope 324 are in contact. Specifically, the aforementioned second direction is the rotation direction of the hub assembly 20 when the tape is pulled out. It can be understood that when the tape is pulled out quickly, the rotation speed of the hub 21 is large enough so that the centrifugal force of the slider 32 overcomes the pulling force of the reset member 322, and the slider 32 gradually moves closer to the deceleration ring 31. When the slider 32 collides with the deceleration protrusion 311, the first guide slope 3112 and the second guide slope 324 are in contact. The slider 32 continues to rotate under the action of the hub 21, causing the first guide inclined surface 3112 and the second guide inclined surface 324 to rub against each other, thereby reducing the speed at which the tape is pulled out.

[0187] In this embodiment, the engagement of the first guide ramp 3112 and the second guide ramp 324 is the same as that of the first deceleration ramp 3111 and the second deceleration ramp 323 described above. For details, please refer to the force analysis of the first deceleration ramp 3111 and the second deceleration ramp 323 described above, which will not be repeated here.

[0188] Furthermore, a first transition surface 3113 is also provided on the deceleration protrusion 311. The first transition surface 3113 is located between the first deceleration ramp 3111 and the first guide ramp 3112. A second transition surface 325 is also provided at the end of the slider 32 near the deceleration ring 31. The second transition surface 325 is located between the second deceleration ramp 323 and the second guide ramp 324. It can be understood that providing the first transition surface 3113 avoids the formation of a sharp angle between the first deceleration ramp 3111 and the first guide ramp 3112, and the second transition surface 325 avoids the formation of a sharp angle between the second deceleration ramp 323 and the second guide ramp 324, thus preventing the slider 32 from being subjected to uneven force at its sharp point.

[0189] Specifically, in this embodiment, both the first transition surface 3113 and the second transition surface 325 are arc surfaces. In other embodiments, the first transition surface 3113 and the second transition surface 325 can also be chamfered, simply by providing rounded corners at the edges.

[0190] Please refer to Figures 22, 23, 25, 27, and 28. The adjusting mechanism 40 is configured to adjust the maximum sliding distance of the slider 32 toward the reduction ring 31. It can be understood that the sliding distance of the slider 32 on the hub 21 is from the position closest to the rotation center of the hub 21 to the position closest to the reduction ring 31. When the slider 32 moves to the position closest to the reduction ring 31, the adjusting mechanism 40 can adjust the distance between the slider 32 and the reduction ring 31. Furthermore, when the slider 32 is never in contact with the reduction ring 31, it indicates that the belt retraction is in a high-speed retraction state; when the slider 32 contacts the reduction ring 31 under the action of the rotation of the hub 21, it indicates that the belt retraction is in a medium-low speed retraction state. The adjusting mechanism 40 can adjust the belt retraction speed, realizing the switching of different retraction speeds to adapt to the needs of different working conditions.

[0191] Specifically, the adjusting mechanism 40 includes a retaining ring 41 and a driving assembly 42. The retaining ring 41 has a first adjusting surface 412. A groove 326 is provided on one side of the slider 32. A second adjusting surface 3261 is provided within the groove 326. The driving assembly 42 is configured to drive the retaining ring 41 closer to or further away from the slider 32, so that the retaining ring 41 enters the groove 326. By having different parts of the first adjusting surface 412 contact the second adjusting surface 3261, the travel distance of the slider 32 toward the deceleration ring 31 is adjusted. It can be understood that when the retaining ring 41 enters the groove 326, the first adjusting surface 412 and the second adjusting surface 3261 abut, preventing the slider 32 from making further centrifugal movements, i.e., preventing the slider 32 from approaching the deceleration ring 31.

[0192] As shown in Figure 24, the drive assembly 42 includes an adjustment knob 421. One side of the adjustment knob 421 is detachably connected to the retaining ring 41 via a fastener 422. As shown in Figure 28, a first wedge block 4211 is provided on the side of the adjustment knob 421 facing the retaining ring 41. A second wedge block 411 is provided on the side of the retaining ring 41 facing the adjustment knob 421. As shown in Figure 27, an opening 112 is provided on the housing 10 (specifically, the base 11 within the housing 10). The adjustment knob 421 is rotatably mounted on the outside of the housing 10. The retaining ring 41 is located on the inside of the housing 10 so that either the first wedge block 4211 or the second wedge block 411 engages with the opening 112 to adjust the distance between the retaining ring 41 and the slider.

[0193] The adjustment mechanism also includes an elastic element 423. Both ends of the elastic element 423 are connected to the housing 10 and the adjustment knob 421, respectively. The elastic element 423 is configured to pull the adjustment knob 421 towards the slider 32 assembly. The elastic element 423 is configured to apply an axial preload to the adjustment knob 421, pulling it towards the side where the slider 32 is located. This design allows the adjustment knob 421 to maintain a stable position when not manually operated, effectively preventing loosening or gear shifting due to vibration or external interference.

[0194] As shown in Figure 28, the first wedge block 4211 and the second wedge block 411 are offset from each other. Both the first wedge block 4211 and the second wedge block 411 are arc-shaped and are positioned around the rotation center of the adjusting knob 421, so that a continuously inclined spiral mating channel, i.e., a spiral groove 43, is formed between the adjusting knob 421 and the retaining ring 41. Correspondingly, as shown in Figure 27, the opening 112 is an arc-shaped clearance groove. The spiral groove 43 and the opening 112 work together to guide the movement of the retaining ring 41.

[0195] Specifically, when the adjustment knob 421 is rotated, the retaining ring 41 rotates accordingly. Since the retaining ring 41 engages with the housing through the opening 112, its rotation is constrained by the wall of the opening 112. Thus, under the push of the inclined contact surface of the spiral groove 43, it rotates while moving along the axial direction. That is to say, this synergistic effect converts the continuous circumferential rotation of the adjustment knob 421 into the axial linear displacement of the retaining ring 41, allowing the retaining ring 41 to move up and down, closer to or further away from the slider 32.

[0196] It is important to emphasize that, due to the continuous axial preload applied by the elastic element 423, after the retaining ring 41 is adjusted to a preset position, the inclined contact surface of the spiral groove 43 remains tightly pressed against the wall of the opening 112 under the action of this preload, forming a self-locking effect. This ensures that the adjusting knob 421 and the retaining ring 41 remain stably positioned throughout the entire use process, avoiding accidental displacement and ensuring the reliability and durability of gear shifting.

[0197] To enable adjustment of multiple speed levels, the first adjustment surface 412 includes multiple stepped surfaces 4121. When the retaining ring 41 moves toward or away from the slider 32 assembly, the second adjustment surface 3261 abuts against different stepped surfaces 4121, configured to adjust the maximum sliding distance of the slider 32 assembly toward the deceleration ring 31.

[0198] It is understood that, in this embodiment, as shown in Figures 23 and 25, the first adjusting surface 412 includes two stepped surfaces 4121, with the diameter of the stepped surface 4121 closer to the deceleration ring 31 being larger than the diameter of the stepped surface 4121 farther from the deceleration ring 31. The tape retraction speed is divided into three levels: high speed, medium speed, and low speed.

[0199] When the tape retraction speed is at the high speed setting, the user manually rotates the adjustment knob 421, causing the retaining ring 41 to be in the highest position. The retaining ring 41 is located in the retaining groove 326, and the second adjustment surface 3261 abuts against the stepped surface 4121 away from the deceleration ring 31. As the hub 21 rotates, the slider 32 gradually moves closer to the deceleration ring 31. The slider 32 does not contact the deceleration ring 31 due to the obstruction of the retaining ring 41. Under the action of the coil spring, the speed of the hub 21 gradually increases, achieving high-speed retraction.

[0200] When the tape retraction speed is at the medium speed setting, the user manually rotates the adjustment knob 421, causing the retaining ring 41 to be positioned within the retaining groove 326, and the second adjustment surface 3261 to abut against the stepped surface 4121 near the deceleration ring 31. As the hub 21 rotates, the slider 32 gradually moves closer to the deceleration ring 31. When the slider 32 and the deceleration ring 31 are in contact or nearly in contact, the first deceleration ramp 3111 and the second deceleration ramp 323 partially or nearly contact each other. The force exerted by the deceleration protrusion 311 on the slider 32 is less than the force exerted at the low speed setting, resulting in a weaker deceleration effect on the hub 21 compared to the low speed setting, ultimately achieving medium-speed tape retraction.

[0201] When the tape retraction speed is at a low setting, the user manually rotates the adjustment knob 421, causing the retaining ring 41 to disengage from the retaining groove 326. As the hub 21 rotates, the slider 32 gradually moves closer to the deceleration ring 31, and when it reaches its farthest boundary and comes into contact with the deceleration ring 31, the first deceleration ramp 3111 and the second deceleration ramp 323 are completely engaged. The deceleration protrusion 311 exerts the greatest force on the slider 32, resulting in the best braking and deceleration effect on the hub 21.

[0202] Optionally, in this embodiment, the tape retraction speed is divided into three levels. In other embodiments, the tape retraction speed can be divided into two or other numbers of levels, which can be achieved by simply adjusting the number of stepped surfaces 4121 of the first adjustment surface 412. This disclosure does not impose any limitations on this.

[0203] To ensure the relative position of the retaining ring 41 is fixed, in this embodiment, the adjusting knob 421 includes a self-locking mechanism (not shown). It is understood that when the adjusting knob 421 is rotated, the self-locking mechanism prevents the adjusting knob 421 from rotating, thus avoiding movement of the retaining ring 41 when released.

[0204] To reduce the friction between the retaining ring 41 and the slider 32, a lubricant is provided between them in this embodiment. Specifically, the lubricant is configured to reduce the friction between the retaining ring 41 and the retaining groove 326, preventing wear.

[0205] The beneficial effects of the adjustable centrifugal deceleration tape measure 100 disclosed herein are:

[0206] The adjustable centrifugal reduction tape measure 100 disclosed herein includes a housing 10, a hub assembly 20, a reduction mechanism 30, and an adjustment mechanism 40. A rotating shaft 111 is disposed within the housing 10. The hub assembly 20 is located within the housing 10 and configured to mount the tape. The hub assembly 20 is sleeved on the rotating shaft 111 and can rotate around the rotating shaft 111. The reduction mechanism 30 includes a reduction ring 31 and a slider 32. The reduction ring 31 is fixedly disposed within the housing 10. The slider 32 is slidably connected to the hub assembly 20, and the slider 32 can move closer to or further away from the reduction ring 31. The adjustment mechanism 40 is configured to adjust the maximum sliding distance of the slider 32 toward the reduction ring 31.

[0207] This disclosure, by setting a deceleration ring 31 and a slider 32, allows the slider 32 to slide relative to the hub assembly 20 under centrifugal force when the hub assembly 20 rotates at high speed, gradually approaching the deceleration ring 31. When the slider 32 collides with the deceleration ring 31, the reaction force on the slider 32 can decelerate the hub assembly 20, thereby reducing the belt retraction speed. Furthermore, the adjusting mechanism 40 can adjust the maximum sliding distance of the slider 32 towards the deceleration ring 31, thus adjusting the distance between the slider 32 and the deceleration ring 31 when the slider 32 slides to its outermost position. When the slider 32 never contacts the deceleration ring 31, the belt retraction is high-speed. When the slider 32 contacts the deceleration ring 31, the belt retraction is low-speed. This disclosure can reduce the belt retraction speed, avoid hand injuries, improve safety, and adjust the belt retraction speed to achieve different retraction speed levels, adapting to different working conditions.

[0208] In another embodiment, this disclosure also provides a flying hammer type deceleration tape measure, which also utilizes the centrifugal force generated during rotation to achieve deceleration. It should be noted that the icons in the foregoing embodiments are not used consecutively, and the reference numerals in Figures 29 to 32 related to this embodiment are renumbered.

[0209] This disclosure provides a flying hammer type deceleration tape measure 10, which is applied in measurement scenarios such as construction, building, or furniture making. It includes a housing 700, a hub 100, a flying hammer assembly 300, and a reset assembly 500.

[0210] The hub 100 is rotatably connected to the housing 700. The hub 100 is generally configured to wind a measuring tape, and the tape retraction speed actually refers to the rotational speed of the hub 100 when the measuring tape is being retracted. Therefore, when the rotational speed of the hub 100 decreases, the tape retraction speed decreases accordingly, and the kinetic energy obtained also decreases accordingly.

[0211] The flyweight assembly 300 is rotatably connected to the hub 100 and configured to rotate towards the housing 700 under centrifugal force. When the hub 100 reaches a preset speed, it collides with the housing 700 to achieve braking. The reset assembly 500 is connected to the hub 100 and configured to rotate the flyweight assembly 300 away from the housing 700, thereby creating a braking balance to keep the hub 100 below or at a preset speed. It is easy to understand that the preset speed of the hub 100 refers to the speed at which the measuring tape will not cut a person's hand, ensuring safe retrieval.

[0212] Specifically, when the hub 100 is stationary and the fly hammer assembly 300 is not subjected to centrifugal force, the fly hammer assembly 300 is in its initial position, maintaining a certain distance from the housing 700. When the hub 100 is below the preset speed, the fly hammer assembly 300 is subjected to centrifugal force, is thrown outward and approaches the housing 700, the reset assembly 500 generates reverse resistance, forming dynamic equilibrium, and the fly hammer assembly 300 maintains its position. When the hub 100 is greater than or equal to the preset speed, the fly hammer assembly 300 overcomes the reverse resistance of the reset assembly 500 and collides with the housing 700, causing the hub 100 to decelerate to the preset speed and tend to be safely recovered at a uniform speed.

[0213] It is easy to understand that in the above process, the centrifugal force and the torque of the reset component 500 work together to give the fly hammer assembly 300 a certain rotational torque, enabling the fly hammer assembly 300 to exert a deceleration and braking effect at different speeds. Furthermore, as the rotational speed of the hub 100 increases, the centrifugal force and centrifugal torque increase, the rotation angle of the fly hammer assembly 300 increases, the collision amplitude and the number of collisions increase, and the deceleration effect becomes more obvious.

[0214] In some embodiments, to improve stability during deceleration, at least two flyweight assemblies 300 are provided, and these two flyweight assemblies 300 are equidistantly spaced along the circumference of the hub 100. Optionally, as shown in FIG30, two flyweight assemblies 300 are provided, and the two flyweight assemblies 300 are centrally symmetrically arranged on the hub 100 with the axis of symmetry as the center of symmetry. In particular, when the hub 100 rotates at high speed, the two centrally symmetrical flyweight assemblies 300 can maintain left-right balance, reducing vibration and offset of the hub 100.

[0215] Referring again to Figure 30, in some embodiments, the 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 may also be configured as a coil spring connected to the flyweight assembly 300, which pulls the flyweight assembly 300 to rotate by tension.

[0216] 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, but without applying force. When the flyweight is subjected to centrifugal force, the return spring 510 is compressed and deformed, generating a reverse resistance that attempts to return the flyweight assembly 300 to its initial position. Furthermore, it should be noted that the aforementioned "reverse resistance" extends outward along the axial direction of the return spring 510.

[0217] Furthermore, the reset assembly 500 also includes a reset rod 530 that slides with the fixed frame 110, and a reset spring 510 is sleeved on the reset rod 530 and abuts against the flyweight assembly 300 via the reset rod 530. It is easy to understand that as the flyweight assembly 300 rotates, the reset rod 530 moves forward or backward along a fixed track, transmitting the movement of the flyweight assembly 300. Based on this, on the one hand, it can effectively prevent the flyweight assembly 300 from affecting its overall performance due to unstable movement; on the other hand, it can reduce movement deviation caused by bending or twisting of the reset spring 510 itself.

[0218] Referring to Figure 31, to facilitate the motion transmission among the stable housing 700, the flyweight assembly 300, and the reset assembly 500, the flyweight assembly 300 includes a first braking part 310, a second braking part 350, and a connecting part 330 connecting the first braking part 310 and the second braking part 350. The connecting part 330 is rotatably connected to the hub 100 and is the rotation center of the flyweight assembly 300.

[0219] The first braking part 310 abuts against or connects with the reset assembly 500 and is subjected to the reset force applied by the reset assembly 500; the second braking part 350 is configured to rotate towards the housing 700 under the action of centrifugal force, and collide with the housing 700 when the hub 100 reaches a preset speed. Optionally, the angle between the extension line of the first braking part 310 and the extension line of the second braking part 350 is an obtuse angle to facilitate rapid motion transmission and improve braking efficiency.

[0220] To further improve transmission efficiency, the first braking part 310 is at least partially arc-shaped, and the arc-shaped structure abuts against the reset assembly 500. It is easy to understand that the first braking part 310 forms a high-pair point contact with the reset assembly 500 through the arc-shaped structure. Compared to the surface contact of the low-pair, the contact area between the first braking part 310 and the reset assembly 500 is greatly reduced, significantly decreasing wear and friction. Due to the lower friction, the first braking part 310 can transmit motion and force to the reset assembly 500 more efficiently, allowing the reset assembly 500 to respond promptly, balancing centrifugal force when the hub 100 rotates at low speeds and reacting to the hub 100 when the hub 100 rotates at high speeds.

[0221] To further improve braking efficiency, the flyweight assembly 300 also includes a counterweight 370 connected to the second braking part 350. This allows the second braking part 350 to experience greater centrifugal force as it rotates at high speed with the hub 100, making it more prone to collision and friction with the housing 700. Accordingly, methods to increase centrifugal force include increasing the mass of the object, increasing the rotational speed, and increasing the distance of the object from the center of rotation. This can be achieved by increasing the thickness of the end of the second braking part 350 away from the connecting part 330, while simultaneously increasing the distance and mass, thereby enhancing the centrifugal force.

[0222] Considering that the distance between the second braking part 350 and the housing 700 is constant, in some embodiments, the length of the second braking part 350 can be increased, and the distance between the second braking part 350 and the housing 700 can be shortened to improve the braking efficiency of the fly hammer assembly 300. In other embodiments, as shown in FIG32, the collision distance can also be shortened by providing a reduction gear 710 on the housing 700. Accordingly, the fly hammer assembly 300 is configured to rotate towards the reduction gear 710 under centrifugal force, and collide with the reduction gear 710 when the hub 100 reaches a preset speed. It is easy to understand that when the hub 100 reaches the preset speed, the fly hammer assembly 300 and the reduction gear 710 continuously collide and rub against each other, braking and decelerating.

[0223] To further increase the collision probability between the housing 700 and the flyweight assembly 300, multiple reduction gears 710 are provided, spaced equidistantly along the circumference of the housing 700. In other words, the multiple reduction gears 710 are arranged in a circular array around the axis of the housing 700 to form a reduction ring. Based on this, when the hub 100 rotates at high speed, the flyweight assembly 300 collides with adjacent reduction gears 710, thereby converting the moving wheel of the hub 100 into internal energy.

[0224] To further increase the collision efficiency between the housing 700 and the flyweight assembly 300, the reduction gear 710 has a first inclined surface 711 near the end of the flyweight assembly 300, and the flyweight assembly 300 has a second inclined surface 351 that mates with the first inclined surface 711. Based on this configuration, the collision area between the housing 700 and the flyweight assembly 300 is increased. When the hub 100 rotates at high speed, the first inclined surface 711 and the second inclined surface 351 come into contact, collide, and rub against each other, enabling more efficient energy conversion. Optionally, both the first inclined surface 711 and the second inclined surface 351 are made of a material with a certain frictional resistance, or both are provided with a friction-enhancing structural layer.

[0225] In addition, it should be noted that the first inclined surface 711 is a tooth-retracting inclined surface, and a tooth-exiting inclined surface can also be provided on the opposite side of the housing 700 along the circumference, so that the tape can have a smooth transition path when it is pulled out.

[0226] Taking the flying hammer type reduction tape measure 10 provided in this disclosure as an example, its working principle and process are as follows:

[0227] When the hub 100 is stationary and the fly hammer assembly 300 is not subjected to centrifugal force, the fly hammer assembly 300 is in its initial position and maintains a certain distance from the reduction gear 710.

[0228] When the hub 100 rotates below a preset speed, the second braking unit 350 is thrown outward by centrifugal force and approaches the housing 700; the return spring 510 is compressed and deformed, generating reverse resistance to function as the first braking unit 310. At this time, the first braking unit 310 and the second braking unit 350 form a dynamic balance, and the flyweight assembly 300 maintains its position. The hub 100 tends to rotate at a uniform speed, and the tape tends to retract at a uniform speed.

[0229] When the hub 100 rotates at a speed greater than or equal to the preset speed, the centrifugal force increases. The first braking part 310 overcomes the reverse resistance of the reset assembly 500, and the second braking part 350 collides with the reduction gear 710, converting kinetic energy into internal energy, causing the hub 100 to decelerate to the preset speed and eventually tend to recover at a uniform speed.

[0230] In summary, this disclosure provides a fly-hammer type deceleration tape measure 10, including a housing 700, a hub 100, a fly-hammer assembly 300, and a reset assembly 500. The hub 100 is rotatably connected to the housing 700. The fly-hammer assembly 300 is rotatably connected to the hub 100 and configured to rotate towards the housing 700 under centrifugal force. When the hub 100 reaches a preset speed, it collides with the housing 700, achieving braking. The reset assembly 500 is connected to the hub 100 and configured to cause the fly-hammer assembly 300 to rotate away from the housing 700, thereby forming a braking balance with the reset assembly 500, keeping the hub 100 below or at a preset speed. Therefore, the tape retraction speed can be maintained at a low speed that will not cut the user's hand, achieving safe retraction.

[0231] In another embodiment, unlike the deceleration method achieved through a brake hub in the aforementioned embodiments, this disclosure also provides a stop-and-limit tape measure. This tape measure utilizes the collision between a centrifugal component and a stop component at the tape outlet, causing the stop component to abut against the tape, increasing friction, and thus slowing down the tape's retraction speed. It should be noted that the icons in the aforementioned embodiments are not used consecutively, and the reference numerals in Figures 33 to 38 related to this embodiment are renumbered.

[0232] This disclosure provides a stop-speed limiting tape measure 10, which is applied in the field of tape measure technology, and includes a tape 100, a housing 200, a stop component 300, a hub 400, and a centrifugal component 510.

[0233] The hub 400 is rotatably connected to the housing 200 and is wound around the tape 100. The housing 200 has a tape outlet 210 configured to slide with the tape 100. Therefore, when the tape 100 is retracted, as the hub 400 rotates, the tape 100 passes through the outlet 210 back into the inner cavity of the housing 200 and wraps around the hub 400. It is readily understood that, in this application, the retraction speed of the tape 100 is the rotational speed of the hub 400.

[0234] Furthermore, the stop member 300 is located at the tape outlet 210 and is rotatably connected to the housing 200. The centrifugal member 510 is slidably connected to the hub 400 and is configured to collide with the stop member 300 when the hub 400 reaches a preset speed, so that the stop member 300 rotates relative to the housing 200 and abuts against the tape 100. It should be noted that the preset speed of the hub 400 refers to a safe retraction speed that prevents the tape 100 from hitting or cutting a person's hand.

[0235] During the above process, on the one hand, the stop member 300 and the housing 200 at the outlet 210 jointly clamp the tape 100, thereby increasing the friction and slowing down the recovery speed of the tape 100; on the other hand, the centrifugal member 510 is subjected to an impact force opposite to the direction of movement under impact, and this force is transmitted to the hub 400, which reduces the rotation speed of the hub 400 and the recovery speed of the tape 100 is also reduced accordingly.

[0236] It should also be noted that the faster the rotational speed of the hub 400, the greater the centrifugal force of the centrifugal component 510, and the larger the rotation angle of the stop component 300 that collides with the centrifugal component 510. Correspondingly, for the tape 100, the distance between the stop component 300 and the housing 200 at the tape outlet 210 decreases, and the clamping force and friction force on the tape 100 increase; for the hub 400, the reaction force of the centrifugal component 510 also increases, and the rotational speed of the hub 400 decreases. In addition, it should be noted that this application achieves deceleration by cooperating with the stop component 300 on one side at the tape outlet 210, and also has the beneficial effects of small space occupation and compact structure.

[0237] Please refer to Figure 36, which is a structural schematic diagram of the stop member 300 provided in this embodiment. In some embodiments, to facilitate the motion transmission between the centrifugal member 510, the stop member 300, and the measuring belt 100, the stop member 300 includes a first braking part 310, a second braking part 330, and a first connecting part 320 connecting the first braking part 310 and the second braking part 330. The first braking part 310 is configured to collide with the centrifugal member 510 when the hub 400 reaches a preset rotational speed; the second braking part 330 is configured to abut against the measuring belt 100 when the hub 400 reaches the preset rotational speed.

[0238] Specifically, the first connecting part 320 is rotatably connected to the housing 200, causing the stop member 300 to rotate within a certain range upon impact with the centrifugal member 510. Therefore, when the hub 400 reaches a preset speed, the first braking part 310 collides with the centrifugal member 510, driving the first connecting part 320 and the second braking part 330 to rotate. This causes the second braking part 330 to abut against the tape 100, ensuring that the tape 100 receives sufficient friction at high speeds, effectively slowing down the recovery speed.

[0239] Furthermore, to increase the sensitivity of the stop member 300 and enable it to transmit motion in a timely manner, the angle between the extension lines of the first braking part 310 and the second braking part 330 is an obtuse angle. Based on this, it is easy to understand that when the first braking part 310 moves a small distance, the second braking part 330, which is farther away, can quickly be configured into the guide belt 100, thereby improving deceleration efficiency.

[0240] Please refer to Figures 36 and 37. To increase the contact area between the centrifugal component 510 and the first braking part 310, a first inclined surface 511 is provided at the end of the centrifugal component 510 near the first braking part 310, and a second inclined surface 311 that mates with the first inclined surface 511 is provided at the end of the first braking part 310 near the centrifugal component 510. Based on this, when the hub 400 reaches a preset speed, the first inclined surface 511 of the centrifugal component 510 and the second inclined surface 311 of the first braking part 310 come into contact, collide, and rub against each other, more effectively reducing the retraction speed of the belt 100.

[0241] Furthermore, it should be noted that both the stop member 300 and the centrifugal member 510 involved in the mutual impact are movable members. That is, during the impact, most of the impact force is transmitted and decelerated through the movement of the stop member 300 and the centrifugal member 510, which are then distributed to the belt 100 and the hub 400. Based on this, the elastic deformation between the stop member 300 and the centrifugal member 510 is significantly reduced, correspondingly reducing the natural frequency vibration and noise caused by the elastic deformation. Optionally, where cost permits, both the first inclined surface 511 and the second inclined surface 311 are made with a rubber-coated structure to further reduce noise and vibration during deceleration.

[0242] In some embodiments, the centrifugal element 510 stop-speed limiting tape measure 10 also includes an elastic element 530, one end of which is connected to the hub 400 and the other end to the centrifugal element 510. Based on this, when the hub 400 is below a preset speed, the tension of the elastic element 530 is greater than the centrifugal force on the centrifugal element 510, causing the centrifugal element 510 to maintain its position and the tape measure 100 to retract smoothly. When the hub 400 reaches the preset speed, the tension of the centrifugal element 510 is greater than the tension of the elastic element 530, causing the centrifugal element 510 to collide with the stop element 300, blocking the movement of the hub 400 and achieving braking.

[0243] Optionally, the elastic element 530 in this application can be a spring, and the centrifugal element 510 can be a metal wedge. When the hub 400 reaches a preset speed, the centrifugal element 510 overcomes the spring force of the return spring and slides along the axis of the spring in a direction away from the axis of the hub 400. It is easy to understand that the metal wedge has a certain weight, which can increase the centrifugal effect.

[0244] Considering the certain distance between the stop member 300 and the upper edge of the tape opening 210, to improve the deceleration efficiency of the stop member 300 on the tape 100, the stop-speed limiting tape measure 10 also includes a locking member 600 located at the tape opening 210. The locking member 600 is connected to the housing 200 and is located on the side of the tape 100 away from the stop member 300. As shown in Figures 34 and 35, the locking member 600 is located on the upper side of the tape 100, and the stop member 300 is located on the lower side of the tape 100. Therefore, when the hub 400 reaches the preset speed, the stop member 300 can rotate and lift the tape 100 upwards. At a small rotation angle, it can clamp the tape 100 together with the locking member 600, thereby increasing the deceleration efficiency.

[0245] It should be noted that when the measuring tape 100 is wound around the hub 400, it presents an inwardly curled arc shape. Correspondingly, the portion of the measuring tape 100 that extends out of the measuring opening 210 is also arc-shaped, with the arc surface facing upward. It possesses a flattening anti-deformation stress, meaning that without external constraint, the measuring tape 100 tends to unfold and straighten. Based on this, during the retraction of the measuring tape 100, the stop member 300 located on one side of the arc surface of the measuring tape 100 is subjected to the flattening anti-deformation stress of the measuring tape 100, and will not lift the measuring tape 100 upward indefinitely.

[0246] Furthermore, it should be noted that, as shown in Figures 34 and 35, when the preset speed is reached at the hub 400, the tape measure 100 is subjected to a downward resisting force from the locking element 600, an upward resisting force from the stop element 300, its own flattening and deformation-resistant stress, and a traction force from the hub 400. It is easy to understand that these forces counterbalance each other, allowing the tape measure 100 to decelerate and retract while maintaining its structural integrity. Moreover, after the tape measure is fully retracted, all forces gradually disappear, and all components return to their initial state.

[0247] Please refer again to Figures 34 and 35. In some embodiments, to ensure that the tape measure 100 can be temporarily locked after being stretched to a preset length for easy reading by the user, the locking member 600 is rotatably connected to the housing 200. The stop-speed limiting tape measure 10 also includes a button 700 movably connected to the housing 200. The button 700 has a first position abutting against the locking member 600 and a second position separating from the locking member 600.

[0248] It should be noted that in this application, the button 700 is rotatably connected to the housing 200. The first position of the button 700 refers to its position when pressure is applied, and the second position refers to its position when the pressure is removed. In other embodiments, the button 700 may also be slidably connected to the housing 200, with the first and second positions being sliding positions where contact can be achieved. This will not be elaborated further in this application.

[0249] Based on this, when button 700 is in the first position, locking member 600 contacts the tape 100 and, together with the tape outlet 210, clamps the tape 100, preventing it from retracting naturally. At this time, the rotational speed of hub 400 is zero, and stop member 300 makes slight contact with the other side of tape 100 without applying force. When button 700 is in the second position, locking member 600 separates from tape 100, tape 100 is released and accelerates its retraction. At this time, the rotational speed of hub 400 increases accordingly. When hub 400 reaches the preset rotational speed, stop member 300 applies force.

[0250] It should be noted that the button 700 in this application is equipped with a limiting structure, so that the button 700 is only allowed to trigger a small amplitude of movement. Based on this, when the button 700 is in the second position, the lifting amplitude of the locking scale member 600 is small, and the tape 100 accelerates its retraction within a smaller space. Furthermore, it should be noted that considering the excessively large gap between the locking scale member 600 and the lower edge of the tape outlet 210, a scale opening member 800 can be correspondingly provided at the lower edge of the tape outlet 210 to shorten the gap. Based on this, when the button 700 is in the first position, the scale opening member 800 and the locking scale member 600 together clamp the tape 100.

[0251] Please refer to Figure 38, which is a structural schematic diagram of the locking ruler component 600 provided in this embodiment. In some embodiments, to facilitate the motion transmission between the button 700, the locking ruler component 600, and the ruler strap 100, the locking ruler component 600 includes a first abutting portion 610, a second abutting portion 630, and a second connecting portion 620 connecting the first abutting portion 610 and the second abutting portion 630. When the button 700 is in the first position, the first abutting portion 610 and the second abutting portion 630 are in contact with the button 700 and the ruler strap 100, respectively.

[0252] Specifically, the second connecting part 620 is rotatably connected to the housing 200, causing the locking scale member 600 to rotate within a certain range as it is supported by the button 700. Therefore, when the button 700 is in the first position, the first supporting part 610 contacts the button 700 and drives the second connecting part 620 and the second supporting part 630 to rotate, thereby causing the second supporting part 630 to contact the scale 100, locking the scale 100 and preventing it from retracting.

[0253] Furthermore, to increase the sensitivity of the locking scale 600 and enable it to transmit movement promptly, the angle between the extension lines of the first abutment 610 and the second abutment 630 is an obtuse angle. Based on this, similarly to the above, when the first abutment 610 moves only a small distance, the more distant second abutment can be quickly configured into the scale 100, improving locking efficiency.

[0254] In some embodiments, as shown in Figures 34 and 35, the stop-speed limiting tape measure 10 further includes a reset member 900. One end of the reset member 900 is connected to the housing 200, and the other end is connected to the second abutment portion 630. Based on the above configuration, when the button 700 is not pressed, the locking member 600 is subjected to the elastic force of the reset member 900, tightly abutting against the surface of the tape 100, and together with the lower edge of the tape opening member 800 or the tape opening 210, clamps the tape 100 to achieve locking. Optionally, the reset member 900 may be provided with a reset spring or a reset plate.

[0255] Taking the stop-speed limiting tape measure 10 improved in this disclosure as an example, its working principle and process are as follows:

[0256] With button 700 in the first position, locking member 600 contacts the measuring tape 100 and, together with measuring tip member 800, clamps the measuring tape 100, thereby locking the measuring tape 100 for easy reading by the user. At this time, the rotational speed of hub 400 is zero, and stop member 300 makes slight contact with the other side of measuring tape 100 without applying any force.

[0257] With button 700 in the second position, locking element 600 separates from the measuring belt 100, and the measuring belt 100 releases and accelerates its retraction. At this time, the rotational speed of hub 400 gradually increases. When hub 400 accelerates to the preset rotational speed, centrifugal element 510 moves and collides with stop element 300.

[0258] During the above process, the stop member 300 and the housing 200 at the outlet 210 jointly clamp the tape 100, increasing friction and slowing down the retraction speed of the tape 100. Meanwhile, the centrifugal member 510 receives an impact force opposite to the direction of motion upon impact, which is transmitted to the hub 400, slowing down the rotation speed of the hub 400 and the retraction speed of the tape 100. Therefore, the retraction speed of the tape 100 is maintained at a low speed that will not cut a person's hand, achieving safe retrieval.

[0259] In summary, this disclosure provides a stop-speed limiting tape measure 10, including a tape 100, a housing 200, a stop member 300, a hub 400, and a centrifugal member 510. The hub 400 is rotatably connected to the housing 200 and wound around the tape 100. The housing 200 has an outlet 210 configured to slide with the tape 100. Therefore, when the tape measure retracts the tape 100, as the hub 400 rotates, the tape 100 passes back through the outlet 210 into the inner cavity of the housing 200 and wraps around the hub 400. The stop member 300 is located at the outlet 210 and rotatably connected to the housing 200. The centrifugal member 510 is slidably connected to the hub 400 and configured to collide with the stop member 300 when the hub 400 reaches a preset speed, causing the stop member 300 to rotate relative to the housing 200 and abut against the tape 100. Therefore, based on the reaction force of the centrifugal component 510 on the hub 400 and the holding force of the stop component 300 on the ruler 100, the rotation speed of the hub 400 will be lower than the preset speed or maintained at the preset speed, thereby ensuring that the ruler 100 is maintained at a recycling speed that will not hit or cut the hands, thus achieving safe recycling. Industrial applicability

[0260] This disclosure provides a tape measure deceleration structure, a tape measure with emergency stop deceleration safety retraction, a friction deceleration tape measure, a noise reduction deceleration tape measure, an adjustable centrifugal deceleration tape measure, a fly hammer deceleration tape measure, and a stop-speed limiting tape measure. These can, to a certain extent, avoid excessive tape winding speed and excessive kinetic energy during tape winding, reduce the risk of hand cuts during tape winding, and thus reduce safety hazards when using steel tape measures.

Claims

1. A tape measure deceleration structure, characterized in that, The device includes a measuring tape, a housing, a measuring tape hub, and a winding component. The measuring tape hub is rotatably disposed within the housing. The measuring tape is wound onto the measuring tape hub. The winding component is disposed within the housing and connected to the measuring tape hub. The winding component is configured to drive the measuring tape hub to rotate and wind up the measuring tape. The device also includes: A flywheel plate, wherein the flywheel plate is disposed on the measuring tape hub; A deceleration assembly is disposed inside the housing. When the measuring tape hub rotates, the flywheel plate collides with the deceleration assembly, and the deceleration assembly buffers and decelerates the measuring tape hub.

2. The tape measure deceleration structure according to claim 1, characterized in that, The deceleration assembly includes an impact rib and a reset member. The impact rib is rotatably disposed within the housing and extends toward the measuring tape hub. The reset member is connected to the impact rib, and the reset member ensures that the impact rib always has a tendency to rotate toward the measuring tape hub.

3. A retractable tape measure with emergency stop and deceleration capability, comprising a housing, a tape hub rotatably disposed within the housing, a tape wound around the tape hub, and a coil spring disposed within the tape hub, characterized in that... Also includes: A flywheel plate, wherein the flywheel plate is disposed on the tape hub; A limiting component is provided inside the housing, and when the ruler hub rotates, it causes the flywheel plate to collide with the limiting component; When the tape wheel hub rotates at a first speed to wind up the tape, the limiting component decelerates the tape wheel hub; when the tape wheel hub rotates at a second speed to wind up the tape, the limiting component restricts the rotation of the tape wheel hub; the first speed is less than the second speed. The housing is also provided with a reset component, which is connected to the limiting component to release the limiting component from restricting the rotation of the belt hub.

4. The retractable, deceleration-type tape measure with emergency stop capability according to claim 3, characterized in that, The limiting component includes a return stop, a deceleration rib, and a first elastic element. The return stop is rotatably disposed within the housing, the deceleration rib is disposed on the return stop, and the first elastic element is connected to the return stop. The first elastic element is configured to ensure that the return stop always has a tendency to rotate along the rotation direction of the belt hub. When the belt hub drives the flywheel plate to rotate at the first speed, the deceleration rib rotates in the opposite direction to the rotation direction of the belt hub under the impact of the flywheel plate.

5. The retractable safety tape measure with emergency stop capability according to claim 4, characterized in that, The limiting component also includes a locking rib, which is disposed on the return stop member. A limiting rib is disposed inside the housing. When the belt hub rotates at the second speed, the locking rib rotates in the opposite direction to the rotation direction of the belt hub after the flywheel plate collides with the deceleration rib. The side of the locking rib away from the deceleration rib can collide with and abut against the flywheel plate during the next collision, so that the deceleration rib abuts against the limiting rib, thereby restricting the rotation of the belt hub.

6. A friction-reducing tape measure, characterized in that, include: A housing, wherein a rotating shaft is disposed within the housing; A hub assembly, located within the housing, is sleeved on the pivot and is rotatable around the pivot; A deceleration mechanism includes a friction ring and a slider assembly. The friction ring is fixedly disposed within the housing, and the slider assembly is slidably connected to the hub assembly. The slider assembly can move closer to or further away from the friction ring.

7. The friction-reducing tape measure according to claim 6, characterized in that, The slider assembly includes a slider, the hub assembly is provided with a groove, the slider slides in cooperation with the groove, and a reset member is provided between the slider and the hub assembly, the reset member being configured to move the slider away from the friction ring.

8. The friction-reducing tape measure according to claim 6, characterized in that, The slider assembly also includes a friction block, which is fixedly connected to one end of the slider near the friction ring. The side of the friction block near the friction ring has a curved surface corresponding to the inner wall of the friction ring.

9. The friction-reducing tape measure according to any one of claims 6 to 8, characterized in that, The thickness of the friction ring gradually increases and then decreases along the direction perpendicular to the center line of the friction ring.

10. A noise-reducing and speed-reducing measuring tape, characterized in that, include: A housing, wherein the inner cavity of the housing is provided with a supporting portion; A damping element, wherein the damping element is at least partially disposed in correspondence with and fits against the supporting portion; A hub, which is located inside the housing and rotatably connected to the housing; A centrifugal component is slidably connected to the hub and configured to collide with the damping component when the hub rotates at a preset speed.

11. The noise-reducing and speed-reducing measuring tape according to claim 10, characterized in that, The damping component includes a collision part and a positioning part that are connected to each other. The positioning part is connected to the housing, and the collision part is correspondingly fitted to the supporting part.

12. An adjustable centrifugal deceleration tape measure, characterized in that, include: A housing, wherein a rotating shaft is disposed within the housing; A hub assembly, which is located inside the housing, is sleeved on the pivot and can rotate around the pivot; A deceleration mechanism, comprising a deceleration ring and a slider, wherein the deceleration ring is fixedly disposed within the housing, and the slider is slidably connected to the hub assembly, and the slider is capable of moving closer to or further away from the deceleration ring; An adjustment mechanism is configured to adjust the maximum sliding distance of the slider toward the deceleration ring.

13. The adjustable centrifugal deceleration tape measure according to claim 12, characterized in that, The inner wall of the deceleration ring is provided with deceleration protrusions at intervals, and the deceleration protrusions are provided with a first deceleration inclined surface. The end of the slider near the deceleration ring is provided with a second deceleration inclined surface. The first deceleration inclined surface is inclined relative to the tangential direction of the deceleration ring. When the hub assembly rotates around the first direction and the slider approaches and abuts the deceleration ring, the first deceleration inclined surface and the second deceleration inclined surface are in contact.

14. The adjustable centrifugal deceleration tape measure according to claim 12 or 13, characterized in that, The adjustment mechanism includes a retaining ring and a drive assembly. The retaining ring has a first adjustment surface, and the slider has a slot on one side. The slot has a second adjustment surface. The drive assembly is configured to drive the retaining ring closer to or further away from the slider so that the retaining ring enters the slot. The first adjustment surface and the second adjustment surface cooperate to adjust the maximum sliding distance of the slider toward the deceleration ring.

15. A flying hammer type deceleration tape measure, characterized in that, include: case; A hub, which is rotatably connected to the housing; A flying hammer assembly, which is rotatably connected to the hub, is configured to rotate towards the housing under centrifugal force and collide with the housing when the hub reaches a preset speed; A reset assembly, connected to the hub, configured to cause the fly hammer assembly to rotate in a direction away from the housing.

16. The flying hammer type deceleration tape measure according to claim 15, characterized in that, The housing is provided with a reduction gear, and the fly hammer assembly is configured to rotate in a direction close to the reduction gear under centrifugal force, and to collide with the reduction gear when the hub reaches the preset speed.

17. The flying hammer type deceleration tape measure according to claim 15 or 16, characterized in that, The flying hammer assembly includes a first braking part, a second braking part, and a connecting part connecting the first braking part and the second braking part; wherein, the connecting part is rotatably connected to the hub; the first braking part abuts against or is connected to the reset assembly; the second braking part is configured to rotate toward the housing under the action of centrifugal force, and to collide with the housing when the hub reaches the preset speed.

18. A stop-speed limiting tape measure, characterized in that, include: Ruler tape; The housing has a measuring port configured to slide with the measuring tape; A stop element is located at the outlet of the ruler and is rotatably connected to the housing. A hub, which is rotatably connected to the housing and is wound around the measuring belt; A centrifugal component is slidably connected to the hub and configured to collide with the stop member when the hub reaches a preset rotational speed, so that the stop member rotates relative to the housing and abuts against the belt.

19. The stop-speed limiting tape measure according to claim 18, characterized in that, The stop-speed limiting tape measure also includes a locking device located at the tape outlet. The locking device is connected to the housing and is located on the side of the tape away from the stop device.

20. The stop-speed limiting tape measure according to claim 19, characterized in that, The stop-speed limiting tape measure also includes a button that is movably connected to the housing, and the button has a first position that abuts against the locking member and a second position that is separated from the locking member; The locking element is rotatably connected to the housing and is configured to contact the tape when the button is in the first position and to separate from the tape when the button is in the second position.

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