A manually lockable light weight seat belt retractor

Abstract

The utility model belongs to the technical field of safety belt winder, disclose a light safety belt winder of manual locking, including framework, ratchet wheel, webbing, flap, reset spring, locking mechanism and switching mechanism, locking mechanism includes inner tooth cover, inertial block, pawl, dial block, tension spring, outer tooth ring, fixed block and locking pin, inner tooth cover links to each other with flap, dial block and ratchet wheel synchronous rotation, pawl rotatably installs on dial block, inertial block links to each other with pawl, outer tooth ring is fixed on inertial block, and locking pin is slidably installed in fixed block and is equipped with the pin in front end, switching mechanism drives locking pin to slide, makes the pin and outer tooth ring engage or separate, when engaging, outer tooth ring locks inertial block, and the pawl tooth is engaged with inner tooth cover by the limiting of top pin, and promotes the locking ratchet wheel of flap, when separating, restores automatic locking, the utility model structure is compact, and the volume is small, and has acceleration automatic locking and manual locking function, and the operation is convenient and reliable.

Description

Technical Field

[0001] This utility model relates to the field of seat belt retractor technology, and in particular to a lightweight seat belt retractor that can be manually locked. Background Technology

[0002] As a crucial personnel restraint and protection device, safety belt retractors are widely used in high-altitude operations, industrial hoisting, extreme sports, special transportation, automotive, and aviation fields. Their core function is to rewind and lock the webbing through an internal mechanism, providing moderate following force during normal activities and quickly locking in the event of a fall or severe impact to ensure personnel safety.

[0003] Existing retractor technologies mostly employ the inertial locking principle, utilizing a centrifugal mechanism to sense the acceleration of the webbing being pulled out to achieve automatic locking. However, with the increasing diversification of application scenarios and the growing demand for lightweight equipment, traditional retractors generally suffer from large size and weight, making them unsuitable for installation in confined spaces or for the lightweight and miniaturization requirements of wearable devices. Furthermore, automatic locking mechanisms relying solely on acceleration sensing have limitations under complex working conditions. For example, in situations where the device is stationary but at risk of falling, or in scenarios requiring manual intervention to fix the working position, a flexible and reliable external intervention method is lacking. Utility Model Content

[0004] To overcome the technical defects of the existing technology, this utility model provides a lightweight seat belt retractor that can be manually locked, including a frame, a ratchet, a webbing, a flap, a return spring, and a locking mechanism. The ratchet is rotatably mounted in the frame, the webbing is wound around the ratchet, the flap is rotatably mounted on the frame and can selectively engage with the locking teeth of the ratchet, and the return spring is disposed between the frame and the flap and drives the flap to separate from the ratchet. The frame is provided with a fixing block, and the locking mechanism is installed on the frame through the fixing block; the locking mechanism includes an inner tooth cover, an inertia block, a pawl, a lever block, a tension spring, an outer tooth ring, and a locking pin; the ratchet is provided with a mounting post, and the inner tooth cover, the inertia block, and the lever block are all sleeved on the mounting post. The end of the mounting post is provided with a slot, and an open retaining ring is engaged in the slot, which axially limits the lever block; The inner tooth cover is provided with inner teeth and a flap groove. The tail end of the flap is inserted into the flap groove. The paddle block and ratchet are circumferentially fixed and rotate synchronously. The pawl is rotatably mounted on the paddle block. The tension spring is connected between the pawl and the paddle block and drives the pawl to separate from the inner teeth of the inner tooth cover. The inertial block is rotatably mounted in the inner tooth cover and is linked with the pawl. The outer tooth ring is fixed on the inertial block. The fixing block is fixed on the frame. The locking pin is slidably mounted in the fixing block along the length direction of the fixing block. One end of the locking pin is provided with a pin. The pin is arranged opposite to the tooth groove of the outer tooth ring and can selectively engage or disengage. It also includes a switching mechanism, which is connected to the locking pin. The switching mechanism drives the locking pin to slide along the length of the fixed block, so that the pin of the locking pin switches between the engagement position and the disengagement position of the external toothed ring. When the switching mechanism is switched to the manual locking position, the switching mechanism drives the locking pin to slide, so that the pin engages with the external toothed ring. The external toothed ring restricts the rotation of the inertial block, thereby locking the inertial block. After the inertial block is locked, the top pin of the pawl is limited by the ratchet groove of the inertial block. When the pawl swings under the action of the lever, its pawl teeth engage with the inner teeth of the inner tooth cover. The pawl pushes the inner tooth cover to rotate through the inner teeth. The inner tooth cover drives the flap to rotate through the flap groove. The flap engages with the locking teeth of the ratchet, thereby locking the ratchet.

[0005] Preferably, the ratchet is provided with a D-shaped groove, and the paddle is provided with a D-shaped hole, and the D-shaped groove and the D-shaped hole are inserted and matched.

[0006] Preferably, the lever has a rotating column, the pawl has a mounting hole, the mounting hole is fitted onto the rotating column, and the pawl swings around the rotating column.

[0007] Preferably, one end of the pawl is provided with a top pin, and the inertial block is provided with a ratchet groove. The top pin is inserted into the ratchet groove, and when the pawl swings, it pushes the inertial block to rotate through the top pin.

[0008] Preferably, the fixing block is provided with a sliding groove, and the locking pin is provided with a guide rail. The guide rail slides in conjunction with the sliding groove to guide the sliding of the locking pin.

[0009] Preferably, the locking pin is provided with a slider groove and a spring post, the slider groove is provided with a sliding block, and a small compression spring is installed between the sliding block and the spring post. The switching mechanism pushes the sliding block to compress the small compression spring, and the elastic force of the small compression spring pushes the locking pin to slide.

[0010] Preferably, the switching mechanism includes a switching switch and a steel cable, the locking pin is provided with a steel cable groove, one end of the steel cable is connected to the switching switch, and the other end of the steel cable is inserted into the steel cable groove.

[0011] Preferably, it also includes a coil spring and a belt pin, wherein the coil spring is disposed in the ratchet and connected to the ratchet, and one end of the webbing is fixed to the ratchet by the belt pin.

[0012] Preferably, a fixing clip is snapped onto the inner tooth cover, and the inertial block is sandwiched between the fixing clip and the inner tooth cover, and the inertial block can rotate freely relative to the fixing clip.

[0013] Preferably, the frame is provided with a ratchet hole, a flap limiting groove, a flap mounting groove, and a return spring retaining groove; the ratchet is rotatably installed in the ratchet hole; the flap is installed in the flap mounting groove, and the flap limiting groove is used to limit the rotation range of the flap; one end of the return spring is engaged in the return spring retaining groove.

[0014] The beneficial effects of this utility model are: 1. This utility model integrates the locking mechanism into the end of the ratchet and adopts a coaxial mounting method, so that the core components such as the inner tooth cover, inertia block, and shift block are arranged sequentially along the mounting post of the ratchet. The layout is reasonable and compact, and no additional installation space is required. The overall number of parts is small, the structure is simple, the size is small, and the weight is light, which can meet the urgent needs of lightweight and miniaturization for high-altitude work equipment, wearable safety equipment, and installation in confined spaces.

[0015] 2. This utility model features two independently controllable locking modes: automatic locking via acceleration sensing and manual locking. Users can freely switch between them according to actual working conditions. In the event of a sudden fall or impact, the reel can automatically trigger locking based on the principle of inertia, promptly protecting personnel safety. When personnel need to maintain a fixed working position in a specific posture, manual locking can be achieved through a switching mechanism, eliminating the need to rely on pulling acceleration. This fills the functional gap of a single automatic locking mode in special working conditions and significantly improves the product's applicability to various scenarios.

[0016] 3. This utility model employs a switching mechanism to drive the locking pin to slide, and then utilizes the engagement of the pin with the external toothed ring to indirectly lock the inertial block using an external toothed ring locking strategy. The locking pin only acts as a switch to position the inertial block; the enormous braking force required for subsequent webbing locking is entirely borne by the mechanical engagement between the ratchet, pawl, internal toothed cover, and flap, and will not be transmitted in reverse to the switching mechanism. This transmission structure, which separates control and execution, significantly improves the reliability and service life of manual locking, and the driving force required for switching operations is minimal, making operation convenient. Attached Figure Description

[0017] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a partial structural schematic diagram of the present invention; Figure 3 This is a schematic diagram of the switching mechanism of this utility model; Figure 4 This is a schematic diagram of the installation of the flap of this utility model; Figure 5 This is an exploded structural diagram of the locking mechanism of this utility model; Figure 6 This is a schematic diagram of the installation of the inner toothed cover of this utility model; Figure 7 This is a schematic diagram of the ratchet structure of this utility model; Figure 8 This is a schematic diagram of the structure of the lever of this utility model; Figure 9 This is a schematic diagram of the installation of the lever of this utility model; Figure 10 This is a schematic diagram of the installation of the external toothed ring of this utility model; Figure 11 This is a schematic diagram of the internal tooth cover of this utility model; Figure 12 This is a schematic diagram of the pawl structure of this utility model; Figure 13 This is a schematic diagram of the installation of the locking pin of this utility model. Figure 14 This is a cross-sectional schematic diagram of the fixing block of this utility model; Figure 15 This is a schematic diagram of the locking pin of this utility model; Figure 16 This is a schematic diagram of the structure of the inertial block of this utility model; Figure 17 This is a schematic diagram showing the engagement state of the flap and the inner tooth cover of this utility model. Figure 18 This is a structural diagram of the framework of this utility model.

[0019] Figure reference numerals: 1. Frame; 1A. Ratchet hole; 1B. Flip plate limiting groove; 1C. Flip plate mounting groove; 1D. Return spring slot; 2. Coil spring; 3. Ratchet; 3A. Locking tooth; 3B. Mounting post; 3C. Slot; 3D. D-shaped groove; 4. Locking mechanism; 401. Inner tooth cover; 401A. Inner tooth; 401B. Flip plate groove; 402. Inertia block; 402A. Ratchet groove; 402B. Outer tooth ring groove; 403. Fixing clip; 404. Pawl; 404A. Pawl tooth; 404B. Mounting hole; 404C. First spring groove; 404D. Top 405. Pin; 405. Toggle block; 405A. D-type hole; 405B. Rotating column; 405C. Second spring groove; 406. Tension spring; 407. Open retaining ring; 408. External toothed ring; 409. Fixing block; 409A. Slide groove; 410. Locking pin; 410A. Guide rail; 410B. Steel cable groove; 410C. Sliding block groove; 410D. Spring column; 410E. Pin; 411. Sliding block; 412. Small compression spring; 413. Mechanism cover; 5. Webbing; 6. Switching mechanism; 601. Switching switch; 602. Steel cable; 7. Flip plate; 8. Return spring; 9. Pin. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the various embodiments of this utility model will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been provided in the various embodiments of this utility model to facilitate a better understanding of this application. However, the technical solutions claimed in the claims of this application can be implemented even without these technical details and with various variations and modifications based on the following embodiments.

[0021] like Figure 1-18 As shown, this embodiment provides a manually lockable lightweight seatbelt retractor. The frame 1 is the basic support component of the retractor and is made of lightweight alloy material. The frame 1 has a ratchet hole 1A, a flap limiting groove 1B, a flap mounting groove 1C, and a return spring retaining groove 1D. The ratchet hole 1A is used to install a ratchet 3, the flap mounting groove 1C is used to install a flap 7, the flap limiting groove 1B is used to limit the rotation range of the flap 7, and the return spring retaining groove 1D is used to engage one end of a return spring 8.

[0022] The ratchet 3 is rotatably inserted into the ratchet hole 1A of the frame 1. The ratchet 3 is provided with a locking tooth 3A, a mounting post 3B, a slot 3C, and a D-slot 3D. The locking tooth 3A is used to engage with the flap 7 to achieve locking. The mounting post 3B extends along the axial direction of the ratchet 3 and is used to install the various components of the locking mechanism 4; the D-slot 3D is opened at the end of the mounting post 3B and is used to cooperate with the D-hole 405A of the lever 405.

[0023] One end of the webbing 5 is fixed to the ratchet 3 by a pin 9, and the webbing 5 is wrapped around the outer periphery of the ratchet 3; the coil spring 2 is located inside the ratchet 3 and connected to the ratchet 3, and the coil spring 2 provides driving force for the retraction of the webbing 5.

[0024] The flap 7 is installed in the flap mounting groove 1C of the frame 1, and the flap 7 can rotate around the mounting point; one end of the return spring 8 is engaged in the return spring retaining groove 1D of the frame 1, and the other end of the return spring 8 is engaged in the limiting groove of the flap 7. Under the elastic force of the return spring 8, the flap 7 remains separated from the locking tooth 3A of the ratchet 3.

[0025] The locking mechanism 4 is located at the end of the ratchet 3. The inner tooth cover 401 is annular, with inner teeth 401A arranged circumferentially on its inner side. The outer edge of the inner tooth cover 401 is provided with a flap groove 401B. The tail end of the flap 7 is inserted into the flap groove 401B, so that the inner tooth cover 401 and the flap 7 are linked. The inertial block 402 is disc-shaped and is located inside the inner tooth cover 401. The inertial block 402 is provided with a ratchet groove 402A and an outer tooth ring groove 402B. The ratchet groove 402A is opened on the end face of the inertial block 402 to accommodate the top pin 404D of the pawl 404. The outer tooth ring groove 402B is opened on the outer periphery of the inertial block 402 to fix the outer tooth ring 408.

[0026] The lever 405 is disposed on the outside of the inertia block 402. The lever 405 has a D-shaped hole 405A, a rotating post 405B, and a second spring groove 405C. The D-shaped hole 405A is inserted into the D-shaped groove 3D of the ratchet 3, so that the lever 405 and the ratchet 3 are relatively fixed in the circumferential direction and rotate synchronously. The rotating post 405B protrudes outward from the surface of the lever 405 for mounting the pawl 404. It has pawl teeth 404A, mounting holes 404B, and a first spring groove 405C. Spring groove 404C and top pin 404D; mounting hole 404B is fitted onto the rotating column 405B of the lever block 405, allowing the pawl 404 to swing around the rotating column 405B; top pin 404D protrudes outward from one end of the pawl 404 and inserts into the ratchet groove 402A of the inertia block 402; one end of tension spring 406 is connected to the second spring groove 405C of the lever block 405, and the other end of tension spring 406 is connected to the first spring groove 404C of the pawl 404. Under normal conditions, tension spring 406 pulls the pawl 404 toward the lever block 405, keeping the pawl teeth 404A of the pawl 404 separated from the inner teeth 401A of the inner tooth cover 401.

[0027] The aforementioned inner tooth cover 401, inertia block 402, and lever block 405 are sequentially sleeved on the mounting post 3B of the ratchet 3 along the axial direction; the fixing clip 403 is engaged with the inner tooth cover 401, and the inertia block 402 is clamped between the fixing clip 403 and the inner tooth cover 401, allowing the inertia block 402 to rotate freely around the fixing clip 403; the open retaining ring 407 is engaged in the slot 3C of the mounting post 3B and located outside the lever block 405, thus axially limiting the lever block 405; the outer tooth ring 408 is fixed on the outer tooth ring groove 402B of the inertia block 402, and the outer tooth ring 408 and the inertia block 402 are relatively fixed in the circumferential direction; the mechanism cover 413 covers the outside of the locking mechanism 4, serving a protective and dustproof function.

[0028] The switching mechanism 6 includes a switching switch 601 and a steel cable 602. A fixing block 409 is fixedly installed on the side of the frame 1. The fixing block 409 has a sliding groove 409A. A locking pin 410 is located inside the fixing block 409. The locking pin 410 has a guide rail 410A, a steel cable groove 410B, a slider groove 410C, a spring post 410D, and a pin 410E. The guide rail 410A is located on the outer surface of the locking pin 410 and slides in cooperation with the sliding groove 409A of the fixing block 409 to guide the sliding of the locking pin 410. The steel cable groove 410B is located at one end of the locking pin 410 and is used to connect the steel cable 602. The slider groove 410C is opened inside the locking pin 410, the spring post 410D is set at the rear end of the slider groove 410C, and the pin 410E is set at the front end of the locking pin 410. The pin 410E is set opposite to the external toothed ring 408.

[0029] The sliding block 411 is disposed in the slider groove 410C of the locking pin 410, and the sliding block 411 can slide along the slider groove 410C; the small compression spring 412 is disposed between the sliding block 411 and the spring post 410D of the locking pin 410.

[0030] One end of the steel cable 602 is connected to the switch 601, and the other end of the steel cable 602 passes through the fixing block 409 and is inserted into the steel cable groove 410B of the locking pin 410. The switch 601 controls the sliding of the locking pin 410 by pulling or releasing the steel cable 602. The pin 410E at the front end of the locking pin 410 is set opposite to the tooth groove of the outer toothed ring 408. When the locking pin 410 slides forward, the pin 410E engages with the outer toothed ring 408, and when it slides backward, it disengages.

[0031] When the switch 601 is switched to the manual position, the switch 601 pulls the steel cable 602 forward (towards the frame); the steel cable 602 pushes the sliding block 411 inside the locking pin 410 to move, and the sliding block 411 compresses the small compression spring 412; the small compression spring 412 generates elastic force after being compressed, pushing the locking pin 410 as a whole to slide forward along the slide groove 409A of the fixed block 409, and the pin 410E at the front end of the locking pin 410 engages with the external toothed ring 408;

[0032] When the switch 601 is switched back to the automatic position, the switch 601 releases the steel cable 602, which moves backward. The steel cable 602 pulls the locking pin 410 back, and the pin 410E separates from the outer toothed ring 408.

[0033] Work process: (a) Normal pull-out state of the webbing: When the user pulls the webbing 5, the ratchet 3 rotates counterclockwise, and the coil spring 2 stores energy; the lever block 405 rotates synchronously with the ratchet 3, pushing the pawl 404 and the inertia block 402 to rotate. Because the pull-out speed is relatively slow, the inertial force of the pawl 404 is less than the tension of the tension spring 406, so the pawl 404 does not throw outward and remains separated from the inner teeth 401A of the inner tooth cover 401. Under the action of the return spring 8, the flap 7 separates from the locking teeth 3A of the ratchet 3, and the webbing 5 can be pulled out freely.

[0034] (ii) Webbing Retraction State: After the webbing 5 is released, the coil spring 2 releases energy, driving the ratchet 3 to rotate clockwise, and the webbing 5 is retracted. The lever 405 rotates synchronously with the ratchet 3. Due to the limiting effect of the lever 405 on the pawl 404, the pawl 404 will not be thrown outward, and the flap 7 remains separated from the ratchet 3, so the webbing 5 is smoothly retracted.

[0035] (III) Automatic locking state with acceleration (switching mechanism in automatic mode): When the switch 601 is in automatic mode, the pin 410E of the locking pin 410 remains separated from the external toothed ring 408, and the inertial block 402 can rotate freely. When the webbing 5 is pulled out with acceleration (if a fall occurs), the ratchet 3 accelerates to rotate counterclockwise, and the shift block 405 accelerates to rotate synchronously; the shift block 405 pushes the pawl 404 to swing rapidly. Because the inertial block 402 is relatively heavy, the rotation of the inertial block 402 lags behind that of the pawl 404, and relative motion occurs between the top pin 404D of the pawl 404 and the ratchet groove 402A of the inertial block 402.

[0036] When the acceleration is large enough, the inertial force on the pawl 404 is greater than the retraction force of the tension spring 406. The pawl 404 overcomes the tension of the tension spring 406 and is thrown outward around the rotating column 405B of the lever block 405. The pawl tooth 404A meshes with the inner tooth 401A of the inner tooth cover 401, while the top pin 404D pushes the inertial block 402 to rotate.

[0037] The pawl 404 pushes the inner tooth cover 401 to rotate via the inner tooth 401A, and the inner tooth cover 401 drives the flap 7 to rotate via the flap groove 401B. After the flap 7 rotates and presses down, it engages with the locking tooth 3A of the ratchet 3, locking the ratchet 3 and preventing the webbing 5 from being pulled out further, thus achieving personnel protection.

[0038] (iv) Manual locking state (switching mechanism to manual mode): The user operates the switch 601 to switch to manual mode; the switch 601 pushes the sliding block 411 to compress the small compression spring 412 through the steel cable 602, and the elastic force of the small compression spring 412 pushes the locking pin 410 to slide forward along the slide groove 409A of the fixed block 409; the pin 410E at the front end of the locking pin 410 engages with the tooth groove of the external tooth ring 408; after the external tooth ring 408 is locked, the inertial block 402 fixedly connected to it is then fixed, and the position of the ratchet groove 402A is fixed.

[0039] When the user pulls the webbing 5, the ratchet 3 rotates, causing the lever 405 to rotate, which in turn pushes the pawl 404 to swing. Since the inertia block 402 is fixed, the top pin 404D of the pawl 404 is limited by the ratchet groove 402A, preventing the top pin 404D from pushing the inertia block 402 to rotate. During the swinging process, the pawl teeth 404A of the pawl 404 directly mesh with the inner teeth 401A of the inner tooth cover 401. The pawl 404 pushes the inner tooth cover 401 to rotate via the inner teeth 401A, and the inner tooth cover 401 drives the flap 7 to rotate via the flap groove 401B. After the flap 7 rotates and presses down, it meshes with the locking teeth 3A of the ratchet 3, thus locking the webbing.

[0040] (v) Manual unlocking to restore automatic locking: The user operates the switch 601 to switch back to automatic mode. Switch 601 releases the steel cable 602, which moves backward, pulling the locking pin 410 backward. The pin 410E of the locking pin 410 separates from the external toothed ring 408, the inertial block 402 resumes free rotation, and the retractor resumes its acceleration automatic locking function.

[0041] Example 2 differs from Example 1 in the driving method of the switching mechanism 6. In this example, the switching mechanism 6 uses a motor drive instead of a manual switch and steel cable. The motor is fixedly installed on the side of the frame 1, and the motor output shaft is connected to the locking pin 410 through a screw drive mechanism or a gear drive mechanism. The user can control the motor to rotate forward or backward via a remote control signal. The motor drives the locking pin 410 to slide back and forth along the slide groove 409A of the fixed block 409, realizing the switching between manual locking and automatic locking functions. This solution is suitable for application scenarios that require remote control or intelligent control, such as unmanned aerial vehicle (UAV) personnel transportation systems and intelligent aerial work platforms.

[0042] Those skilled in the art will understand that the above embodiments are specific examples of implementing the present invention, and in practical applications, various changes can be made to them in form and detail without departing from the spirit and scope of the present invention.

Claims

1. A manually lockable lightweight seatbelt retractor, comprising a frame, a ratchet, a webbing, a flap, a return spring, and a locking mechanism, wherein the ratchet is rotatably mounted within the frame, the webbing is wound around the ratchet, the flap is rotatably mounted on the frame and selectively engages with the locking teeth of the ratchet, and the return spring is disposed between the frame and the flap and drives the flap to separate from the ratchet, characterized in that: The frame is provided with a fixing block, and the locking mechanism includes an inner tooth cover, an inertia block, a ratchet, a shift block, a tension spring, an outer tooth ring, and a locking pin; the ratchet is provided with a mounting post, and the inner tooth cover, the inertia block, and the shift block are all sleeved on the mounting post. The end of the mounting post is provided with a slot, and an open retaining ring is engaged in the slot. The open retaining ring limits the axial movement of the shift block. The inner tooth cover is provided with inner teeth and a flap groove. The tail end of the flap is inserted into the flap groove. The paddle block and ratchet are circumferentially fixed and rotate synchronously. The pawl is rotatably mounted on the paddle block. The tension spring is connected between the pawl and the paddle block and drives the pawl to separate from the inner teeth of the inner tooth cover. The inertial block is rotatably mounted in the inner tooth cover and is linked with the pawl. The outer tooth ring is fixed on the inertial block. The locking pin is slidably mounted in the fixed block along the length direction of the fixed block. One end of the locking pin is provided with a pin. The pin is arranged opposite to the tooth groove of the outer tooth ring and can selectively engage or disengage. It also includes a switching mechanism, which is connected to the locking pin and drives the locking pin to switch between the engaged and disengaged positions of the external toothed ring; When the switching mechanism is switched to the manual locking position, the switching mechanism drives the locking pin to slide, so that the pin engages with the outer toothed ring. The outer toothed ring restricts the rotation of the inertial block, thus locking the inertial block. After the inertial block is locked, the top pin of the pawl is limited by the ratchet groove of the inertial block. When the pawl swings under the action of the lever, its pawl teeth engage with the inner teeth of the inner tooth cover. The pawl pushes the inner tooth cover to rotate through the inner teeth. The inner tooth cover drives the flap to rotate through the flap groove. The flap engages with the locking teeth of the ratchet, thereby locking the ratchet.

2. The manually lockable lightweight seatbelt retractor according to claim 1, characterized in that: The ratchet is provided with a D-shaped groove, and the paddle is provided with a D-shaped hole. The D-shaped groove and the D-shaped hole are inserted and matched.

3. A manually lockable lightweight seatbelt retractor according to claim 1, characterized in that: The lever is provided with a rotating column, and the pawl is provided with a mounting hole. The mounting hole is fitted onto the rotating column, and the pawl swings around the rotating column.

4. A manually lockable lightweight seatbelt retractor according to claim 1, characterized in that: One end of the pawl is provided with a top pin, and the inertial block is provided with a ratchet groove. The top pin is inserted into the ratchet groove, and when the pawl swings, it pushes the inertial block to rotate through the top pin.

5. A manually lockable lightweight seatbelt retractor according to claim 1, characterized in that: The fixing block is provided with a sliding groove, and the locking pin is provided with a guide rail. The guide rail slides in conjunction with the sliding groove to guide the sliding of the locking pin.

6. A manually lockable lightweight seatbelt retractor according to claim 1, characterized in that: The locking pin is provided with a slider groove and a spring post. The slider groove is provided with a sliding block. A small compression spring is installed between the sliding block and the spring post. The switching mechanism pushes the sliding block to compress the small compression spring, and the elastic force of the small compression spring pushes the locking pin to slide.

7. A manually lockable lightweight seatbelt retractor according to claim 1, characterized in that: The switching mechanism includes a switching switch and a steel cable. The locking pin is provided with a steel cable groove. One end of the steel cable is connected to the switching switch, and the other end of the steel cable is inserted into the steel cable groove.

8. A manually lockable lightweight seatbelt retractor according to claim 1, characterized in that: It also includes a coil spring and a belt pin, wherein the coil spring is disposed in the ratchet and connected to the ratchet, and one end of the webbing is fixed to the ratchet by the belt pin.

9. A manually lockable lightweight seatbelt retractor according to claim 1, characterized in that: A fixing clip is snapped onto the inner tooth cover, and the inertial block is sandwiched between the fixing clip and the inner tooth cover, and the inertial block can rotate freely relative to the fixing clip.

10. A manually lockable lightweight seatbelt retractor according to claim 1, characterized in that: The frame is provided with a ratchet hole, a flap limiting groove, a flap mounting groove, and a return spring retaining groove; the ratchet is rotatably installed in the ratchet hole; the flap is installed in the flap mounting groove, and the flap limiting groove is used to limit the rotation range of the flap; one end of the return spring is engaged in the return spring retaining groove.

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