A kickback prevention chain saw safety guard

Abstract

The application belongs to the technical field of chain saw anti-rebound, and discloses a chain saw safety protection device capable of preventing rebound, which comprises a machine body, a guide plate, a clutch drum arranged in the machine body, a motor driving element fixed to the outside of the machine body and having an output end fixed to the clutch drum, and further comprises: an elastic buffer energy-absorbing mechanism installed at the tip area of the guide plate; and a moving assembly having one end arranged in the inside of the guide plate. The application is provided with a buffer wear-resistant head, a first spring, a vertical rod, a resisting rod, an inclined rod, a moving rod, a first pawl, an inertial pendulum, an inclined push plate, a second pawl, a converging ratchet, a cam, a brake belt and a positioning locking structure, which have multiple significant technical advantages compared with the single passive brake protection structure of the conventional chain saw, and effectively solve the problems of brake lagging after rebound, inability to eliminate initial impact energy and poor protection reliability in the prior art.

Description

Technical Field

[0001] This invention belongs to the field of anti-rebound technology for chainsaws, specifically an anti-rebound safety protection device for chainsaws. Background Technology

[0002] A chainsaw is a portable power cutting tool that uses an engine to drive a saw chain that rotates at high speed around a guide plate to perform cutting operations. During chainsaw use, springback is the most dangerous type of safety accident. Springback occurs when the tip of the guide plate contacts an obstacle or the saw chain gets stuck in the wood, suddenly stopping the chain's movement. However, the engine continues to drive the sprocket to rotate, and the driving force is converted into a reverse rotational torque around the contact point of the guide plate tip, causing the entire chainsaw to spring back towards the operator with extremely high angular acceleration.

[0003] Currently, the chainsaw industry commonly uses a braking mechanism combining a chain brake band and a brake drum for rebound protection. Triggering methods include manual guard plate triggering and inertial pendulum triggering. However, these existing solutions all rely on a single, passive braking approach after rebound occurs, meaning the brake band only applies the brakes after the rebound has occurred and been transmitted to the machine. Existing devices lack a proactive protection mechanism to absorb impact energy before rebound is triggered. When the guide plate tip contacts an obstacle at high speed, the impact energy is directly transmitted to the machine and operating system before the braking mechanism intervenes. The initial angular acceleration of the rebound has already been established, and even if the braking mechanism completes braking within tens of milliseconds, the operator will still suffer significant impact injury. Therefore, improvements are needed. Summary of the Invention

[0004] To address the problems mentioned in the background section, the present invention provides a chainsaw safety protection device that prevents rebound.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a chainsaw safety protection device for preventing rebound, comprising a body, a guide plate, a clutch drum disposed inside the body, and a motor drive component fixedly connected to the outside of the body with its output end fixedly connected to the clutch drum, further comprising: An elastic buffer energy absorption mechanism is installed at the tip of the guide plate; The moving component has one end located inside the guide plate and the other end located inside the body; Rotating assembly, which is rotatably connected inside the body; The elastic buffer energy absorption mechanism includes a housing fixed to a guide plate. A buffer wear-resistant head is elastically connected inside the housing via a first spring. Vertical rods are slidably connected to both ends inside the housing. A stop rod is fixed between the two vertical rods. The bottom end of the stop rod extends slidably into the interior of the guide plate. The moving component includes a diagonal bar that abuts against the abutment rod. The diagonal bar is slidably connected inside the guide plate and elastically connected to the guide plate via a third spring.

[0006] Preferably, both ends of the abutment are slidably connected to guide rods, and the guide rods are fixed inside the guide plate; The outer wall of the guide rod is movably fitted with a second spring, the top and bottom ends of which are fixedly connected to the abutment rod and the guide plate, respectively.

[0007] Preferably, a shift rod is fixedly connected to the end of the inclined rod away from the elastic buffer energy absorption mechanism, and a first pawl is fixedly connected to the end of the shift rod located inside the machine body; The first pawl is in contact with the rotating component.

[0008] Preferably, the rotating assembly includes a rotating shaft disposed inside the machine body, and a cam and a converging ratchet are respectively installed at both ends of the outer wall of the rotating shaft; The confluence ratchet engages with the first pawl.

[0009] Preferably, the cam is provided with a spring plate inside to allow it to elastically return to its original position. The upper end of the spring plate is rotatably connected to a connecting rod, and the end of the connecting rod away from the cam is rotatably connected to a swing arm.

[0010] Preferably, a brake band is fixedly connected to the end of the swing arm away from the connecting rod; The brake band is sleeved on the outside of the clutch drum, with a gap between them. The end of the brake band away from the swing arm is fixed to the inside of the machine body. A limiting spring sheet is fixed to the outer side of the brake band.

[0011] Preferably, a positioning block is fixedly connected to one side of the outer wall of the cam, and a locking element is abutted against the outer wall of the positioning block; The locking component includes a locking pin movably connected to the body, and a fifth spring is sleeved on the outer wall of the locking pin at one end of the outer side of the body. The contact end between the positioning block and the locking pin is provided at an angle.

[0012] Preferably, a swing assembly is provided at one end of the outer wall of the confluence ratchet; The swing assembly includes a fourth spring fixed to the bottom of the internal cavity of the machine body, and an inertial pendulum is fixed to the top of the fourth spring.

[0013] Preferably, one end of the inertial pendulum is connected to an inclined push plate, and the top end of the inclined push plate is fixedly connected to a second pawl, which engages with the confluence ratchet.

[0014] Preferably, one end of the inclined push plate is slidably connected to the inner wall of the machine body via a spring limiting post.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention, through the combination of a buffer wear-resistant head, a first spring, a vertical rod, a stop rod, a diagonal rod, a moving rod, a first pawl, an inertial pendulum, a diagonal push plate, a second pawl, a converging ratchet, a cam, a brake band, and a positioning and locking structure, possesses multiple significant technical advantages compared to the traditional chainsaw's single passive braking protection structure. It effectively solves the problems of delayed braking after rebound, inability to dissipate initial impact energy, and poor protection reliability in existing technologies.

[0016] This invention adds a pre-rebound buffer protection mechanism. In the initial stage of the chainsaw rebound, when the tip of the guide plate contacts an obstacle and causes an impact, the first spring can be compressed by the buffer wear-resistant head to quickly absorb and buffer the initial impact energy of the rebound. Before the initial angular acceleration of the rebound is fully established, most of the impact stress is eliminated, avoiding the impact energy from being directly transmitted to the machine body and operating system. This significantly reduces the impact injury to the operator and makes up for the technical defects of traditional braking mechanisms that can only passively brake after the rebound occurs and cannot unload the force in advance.

[0017] This invention constructs a fallback protection system with dual-path independent triggering and unified merging braking, forming a buffer-triggered braking path and an inertial-triggered braking path respectively. Relying on the mechanical linkage after the buffer wear-resistant head is impacted, the vertical rod, the stop rod, the diagonal rod, and the moving rod are sequentially driven to drive the first pawl to drive the merging ratchet to rotate; Utilizing the angular acceleration generated by the body's rebound and flip, the inertial pendulum overcomes the preload of the fourth spring and deflects, driving the second pawl to rotate in the same direction via the inclined push plate. The two trigger paths are independent of each other and mutually support each other. Triggering either path can synchronously drive the rotating shaft and cam through the converging ratchet, driving the connecting rod and swing arm to tighten the brake band, lock the clutch drum, quickly lock the sprocket, and cut off the rebound driving force, greatly improving the response reliability and adaptability of the anti-rebound braking. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of a portion of the body and the motor drive component of the present invention; Figure 3 This is a schematic diagram of the structure of the guide plate and the elastic buffer energy absorption mechanism of the present invention; Figure 4 This is a schematic diagram of the rotating component and the swinging component of the present invention; Figure 5 This is a schematic diagram of the subdivided structure of the rotating component of the present invention; Figure 6 This is a schematic diagram of the subdivided structure of the swing component of the present invention; Figure 7 This is a schematic diagram of the subdivided structure of the elastic buffer energy absorption mechanism of the present invention; Figure 8 This is a schematic diagram of the cam and confluence ratchet structure of the present invention; Figure 9 This is a schematic diagram of the card post and positioning block structure of the present invention.

[0019] In the picture: 100. Body; 200. Guide plate; 300. Elastic buffer energy absorption mechanism; 310. Housing; 320. Buffer wear-resistant head; 330. First spring; 340. Vertical rod; 350. Push rod; 360. Second spring; 370. Guide rod; 400. Clutch drum; 500. Motor drive components; 600, Moving component; 610, Diagonal bar; 620, Third spring; 630, Shifting bar; 640, First pawl; 700, Rotating assembly; 710, Converging ratchet; 720, Cam; 730, Connecting rod; 740, Swing arm; 750, Brake band; 760, Limiting spring plate; 770, Positioning block; 780, Spring plate; 790, Rotating shaft; 800, Swing assembly; 810, Inertial pendulum; 820, Inclined push plate; 830, Second pawl; 840, Spring limit post; 850, Fourth spring; 900, Card; 910, Card Post; 920, Fifth Spring. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] like Figures 1 to 9 As shown, the present invention provides a chainsaw safety protection device to prevent rebound, including a body 100, a guide plate 200, a clutch drum 400 disposed inside the body 100, and a motor drive component 500 fixedly connected to the outside of the body 100 and whose output end is fixedly connected to the clutch drum 400, and further including: An elastic buffer energy absorption mechanism 300 is installed in the tip region of the guide plate 200; The moving component 600 has one end located inside the guide plate 200 and the other end located inside the body 100; Rotating assembly 700 is rotatably connected inside the body 100; The elastic buffer energy absorption mechanism 300 includes a housing 310 fixedly attached to the guide plate 200. The inside of the housing 310 is elastically connected to a buffer wear-resistant head 320 via a first spring 330. Vertical rods 340 are slidably connected to both ends inside the housing 310. A stop rod 350 is fixedly connected between the two vertical rods 340. The bottom end of the stop rod 350 extends slidably into the inside of the guide plate 200. The moving component 600 includes a diagonal bar 610 that abuts against the abutment bar 350. The diagonal bar 610 is slidably connected inside the guide plate 200 and is elastically connected to the guide plate 200 by a third spring 620.

[0022] The above scheme is adopted as follows: When the tip of the guide plate 200 rebounds and collides, the buffer wear-resistant head 320 is first compressed and moves downward along the inside of the housing 310. The first spring 330 is compressed and stores energy, absorbing the peak energy of the impact and realizing pre-rebound buffering. When the buffer wear-resistant head 320 is compressed to the trigger threshold, the vertical rod 340 and the abutment rod 350 move downward simultaneously. The bottom end of the abutment rod 350 enters the inside of the guide plate 200 and abuts the inclined rod 610 of the moving component 600. The inclined rod 610 converts the vertical force into lateral displacement and transmits it to the inside of the body 100, thereby driving the rotating component 700 to achieve braking. This achieves a graded protection effect of "only buffering and absorbing energy without braking in light collisions, and buffering and absorbing energy and braking locking are activated simultaneously in medium and heavy collisions". Moreover, the buffer wear-resistant head 320 protrudes from the outline of the guide plate 200, ensuring that any collision in any direction in the rebound area of ​​the tip of the guide plate 200 will preferentially act on the buffer wear-resistant head 320, intercepting the rebound triggering condition from the source.

[0023] Both ends of the abutment 350 are slidably connected to guide rods 370, and the guide rods 370 are fixed inside the guide plate 200; A second spring 360 is movably sleeved on the outer wall of the guide rod 370. The top and bottom ends of the second spring 360 are respectively fixed to the abutment rod 350 and the guide plate 200.

[0024] The above scheme is adopted: the guide rod 370 axially guides the up and down sliding of the abutment rod 350 to prevent the abutment rod 350 from deflecting or jamming under impact load, and ensures that the impact force is stably transmitted along the preset direction; the second spring 360 is sleeved on the outer wall of the guide rod 370 and its two ends are respectively connected to the abutment rod 350 and the guide plate 200, providing auxiliary elastic resistance during the downward compression process of the abutment rod 350, forming a double spring parallel energy absorption structure with the first spring 330, enhancing the overall rigidity and energy absorption capacity of the buffer energy absorption mechanism; when the impact is eliminated, the second spring 360 and the first spring 330 work together to make the abutment rod 350 and the buffer wear-resistant head 320 quickly return to the initial state, restoring the standby function of the device.

[0025] The end of the diagonal bar 610 away from the elastic buffer energy absorption mechanism 300 is fixedly connected to the shifting bar 630, and the end of the shifting bar 630 located inside the body 100 is fixedly connected to the first pawl 640. The first pawl 640 is in contact with the rotating assembly 700.

[0026] The above scheme is adopted: when the abutment rod 350 moves downward, it abuts against the inclined rod 610. The inclined rod 610 converts the vertical thrust into a lateral displacement along its lateral direction. The displacement is transmitted to the inside of the body 100 through the shift rod 630. The first pawl 640 at the end of the shift rod 630 deflects under the action of the thrust and engages with the tooth surface of the rotating component 700, pushing the rotating component 700 to rotate. The inclined rod 610 is elastically connected to the guide plate 200 through the third spring 620. When the impact force is eliminated, the third spring 620 causes the inclined rod 610 to automatically return to its original position, and the shift rod 630 and the first pawl 640 reset synchronously. This realizes a reliable linkage between the elastic buffer energy absorption mechanism 300 and the rotating component 700. Moreover, the inclined setting of the inclined rod 610 plays a role in force direction conversion and force amplification, improving trigger sensitivity and transmission efficiency.

[0027] The rotating assembly 700 includes a rotating shaft 790 disposed inside the body 100, and a cam 720 and a converging ratchet 710 are respectively installed at both ends of the outer wall of the rotating shaft 790. The confluence ratchet 710 engages with the first pawl 640.

[0028] The above scheme is adopted: the rotating shaft 790 passes through the center of the converging ratchet 710 and is connected by a spline. The converging ratchet 710 rotates synchronously with the rotating shaft 790, and the cam 720 is fixed to the outer wall of the rotating shaft 790 and rotates synchronously with the rotating shaft 790. When the first pawl 640 pushes the converging ratchet 710 to rotate, the converging ratchet 710 drives the rotating shaft 790 to rotate through the spline. The rotating shaft 790 drives the cam 720 to rotate. The rotational motion of the cam 720 is converted into a linear thrust through the connecting rod 730 and the swing arm 740 to drive the brake band 750 to tighten and lock the clutch drum 400. The spiral lift curve of the cam 720 amplifies the small pawl thrust into several times the braking pressure, realizing the force amplification effect, so that the operator can achieve reliable braking and locking without applying additional force.

[0029] The cam 720 has a spring plate 780 inside that allows it to elastically return to its original position. The upper end of the spring plate 780 is rotatably connected to a connecting rod 730, and the end of the connecting rod 730 away from the cam 720 is rotatably connected to a swing arm 740.

[0030] The above scheme employs the following: a spring plate 780 is disposed inside the cam 720, storing elastic potential energy during the rotation of the cam 720. When the braking force reaches a preset value, the elastic force of the spring plate 780 keeps the cam 720 in its current position, preventing the brake band 750 from loosening on its own under vibration or impact. The cam 720 is rotatably connected to the swing arm 740 via a connecting rod 730. When the cam 720 rotates, it pushes the connecting rod 730 to move linearly, and the connecting rod 730 drives the swing arm 740 to swing around the pin, converting the rotational motion of the cam into the angular displacement of the swing arm, thus achieving stable force transmission and direction conversion. When the brake is released, the spring plate 780 releases its elastic potential energy, causing the cam 720 to return to its original position in the opposite direction, and the connecting rod 730 and the swing arm 740 return to their original positions synchronously.

[0031] A brake band 750 is fixedly connected to the end of the swing arm 740 away from the connecting rod 730; The brake band 750 is sleeved on the outside of the clutch drum 400, with a gap between it and the clutch drum 400. The end of the brake band 750 away from the swing arm 740 is fixed to the inside of the machine body 100. A limiting spring plate 760 is fixedly attached to the outer side of the brake band 750.

[0032] The above scheme is adopted: the brake band 750 is sleeved on the outside of the clutch drum 400 with a gap between them. During normal cutting, the clutch drum 400 can rotate freely without interference. During braking, the gap is quickly eliminated to achieve rapid locking. The gap design ensures zero friction loss under normal working conditions and rapid response during braking. One end of the brake band 750 is fixed to the swing arm 740, which provides tension. The other end is fixed inside the machine body 100 to form a fixed hinge end. The brake band 750 wraps around the outer circumference of the clutch drum 400 in an arc shape. It generates self-amplifying force by utilizing the wrapping angle effect. The rotation direction of the clutch drum 400 makes the brake band 750 tighten more and more, increasing the braking force several times under the same tension. The limiting spring plate 760 is fixed on the outside of the brake band 750 and applies radial preload to the brake band 750, so that the brake band 750 maintains a uniform gap with the clutch drum 400 in the loosened state, preventing the brake band 750 from loosening and shifting.

[0033] A positioning block 770 is fixedly connected to one side of the outer wall of the cam 720, and a locking piece 900 is connected to the outer wall of the positioning block 770. The locking component 900 includes a locking post 910 movably connected to the body 100, and a fifth spring 920 is sleeved on the outer wall of the locking post 910 at one end of the outer side of the body 100. The contact end between the positioning block 770 and the locking post 910 is provided with an angle.

[0034] Using the above scheme: When the cam 720 rotates to the braking position, the positioning block 770 rotates synchronously with the cam 720 and pushes the angled end of the locking pin 910. Under the elastic force of the fifth spring 920, the locking pin 910 automatically engages with the locking surface of the positioning block 770, mechanically locking the rotational position of the cam 720 to prevent the cam 720 from reversing and retracting under vibration or residual impact, ensuring that the brake band 750 remains in a locked state. When it is necessary to release the brake, the operator manually presses the locking pin 910 to overcome the elastic force of the fifth spring 920, causing the locking pin 910 to disengage from the positioning block 770. Under the restoring force of the spring plate 780, the cam 720 reverses and returns to its original position, and the brake is released.

[0035] A swing assembly 800 is provided at one end of the outer wall of the confluence ratchet 710; The swing assembly 800 includes a fourth spring 850 fixed to the bottom of the inner cavity of the body 100, and an inertial pendulum 810 fixed to the top of the fourth spring 850.

[0036] The above scheme is adopted: the inertial pendulum 810 is connected to the bottom of the inner cavity of the body 100 through the fourth spring 850, and its center of gravity is offset from the pin position. When the body 100 is working normally, it is kept stationary by the preload of the fourth spring 850. When the rebound occurs, the body 100 rapidly flips upward to generate a large angular acceleration. The inertial pendulum 810 generates a deflection torque relative to the body 100 due to its own inertia. When the inertial torque overcomes the preload of the fourth spring 850, the inertial pendulum 810 is quickly thrown out towards the inclined push plate 820. This triggering path is independent of the triggering path of the elastic buffer energy absorption mechanism 300. Even if the elastic buffer energy absorption mechanism 300 fails to be effectively triggered due to the collision position or impact angle of the obstacle, the inertial pendulum 810 can still be triggered independently by the angular acceleration of the body 100 flipping, forming a second completely independent braking triggering channel. The two paths mutually support each other, significantly improving the reliability and coverage of the anti-rebound protection.

[0037] One end of the inertial pendulum 810 is connected to the inclined push plate 820, and the top end of the inclined push plate 820 is fixed to the second pawl 830, which is engaged with the confluence ratchet 710.

[0038] The above scheme is adopted: after the inertial pendulum 810 is thrown out, it abuts against the inclined push plate 820. The inclined push plate 820 converts the impact force of the inertial pendulum 810 into an oblique thrust force and transmits it to the second pawl 830. The second pawl 830 deflects and engages with the tooth surface of the converging ratchet 710, pushing the converging ratchet 710 to rotate in the same direction as the pushing direction of the first pawl 640. The converging ratchet 710 then drives the cam 720 to rotate through the rotating shaft 790, and through the connecting rod 730 and the swing arm 740, the brake band 750 locks the clutch drum 400. The first pawl 640 and the second pawl 830 push the same converging ratchet 710 from different directions. The braking actions of the two trigger paths converge into the same execution terminal. Either trigger can independently complete the entire braking process, realizing a redundant protection architecture of "dual trigger, single execution". Even if a single trigger path fails, the other path can still ensure the normal execution of the braking function.

[0039] One end of the inclined push plate 820 is slidably connected to the inner wall of the body 100 via a spring limiting post 840.

[0040] The above scheme is adopted: the inclined push plate 820 is slidably connected to the inner wall of the machine body 100 through the spring limiting post 840. The spring limiting post 840 guides and limits the sliding direction of the inclined push plate 820, ensuring that the inclined push plate 820 moves smoothly along the preset direction under the impact of the inertial pendulum 810, preventing the inclined push plate 820 from tilting or shaking, which would cause the second pawl 830 to mis-engage with the confluence ratchet 710. After the impact of the inertial pendulum 810 ends, the elastic restoring force on the spring limiting post 840 causes the inclined push plate 820 and the second pawl 830 to automatically return to the initial state, preparing for the next trigger. The limiting design of the spring limiting post 840 ensures the motion accuracy and reliability of the swing assembly 800 during repeated triggering and reset processes, and extends the service life of the device.

[0041] Working principle and usage process of this invention: When rebound occurs, the tip of the guide plate 200 first contacts the obstacle, generating an impact. Under the impact pressure, the buffer wear-resistant head 320 is compressed downwards along the inner cavity of the guide plate 200 towards the housing 310, and the first spring 330 inside it stores energy. When the downward displacement of the buffer wear-resistant head 320 reaches the preset trigger threshold, the bottom surface of the buffer wear-resistant head 320 abuts against the top of the vertical rod 340. The vertical rod 340 moves downwards synchronously under axial pressure, and transmits the thrust to the abutment rod 350, which abuts against the bottom end of the vertical rod 340. The abutment rod 350 moves downwards synchronously with the vertical rod 340. When the abutment 350 descends to its end, it presses down and abuts one end of the inclined bar 610. Since the contact end between the inclined bar 610 and the abutment 350 is inclined, the vertical force applied by the abutment 350 is converted into a lateral thrust along the direction of the inclined bar by the inclined bar 610. This lateral thrust is transmitted to the first pawl 640 through the shifting bar 630, causing the first pawl 640 to deflect around its pin and engage with the tooth surface of the confluence ratchet 710, thus pushing the confluence ratchet 710 to rotate. The confluence ratchet 710 drives the rotating shaft 790 to rotate synchronously through a spline connection. The cam 720 fixed at the other end of the rotating shaft 790 rotates synchronously with the rotating shaft 790. The cam surface of the cam 720 abuts against the follower at one end of the connecting rod 730. Under the action of this thrust, the connecting rod 730 drives the swing arm 740 to move. The other end of the swing arm 740 is tightened and locked by the brake band 750, and the sprocket installed on the clutch drum 400 is locked, the saw chain stops running, and the springback driving force is cut off. At this time, the positioning block 770 is driven to rotate and first presses against the locking pin 910 to make the fifth spring 920 store energy. When the end of the locking pin 910 is opposite to the slot on the positioning block 770, the fifth spring 920 releases energy, causing the locking pin 910 to be locked into the slot of the positioning block 770, thereby locking the cam 720. Simultaneously, upon rebound, the body 100 swings rapidly upward under the action of the rebound torque, generating a large angular acceleration. The center of gravity of the inertial pendulum 810 deviates, and during the rapid rotation of the body 100, the inertial pendulum 810, due to its own inertia, undergoes a deflection relative to the body 100. When the inertial torque generated by the rebound angular acceleration overcomes the preload of the fourth spring 850, the inertial pendulum 810 is rapidly thrown out towards the inclined push plate 820 with impact. The end of the inertial pendulum 810 abuts against the inclined push plate 820, which transmits the impact force of the inertial pendulum 810 to the second pawl 830. Under the pushing force of the inclined push plate 820, the second pawl 830 deflects around its pin, engages with the teeth of the converging ratchet 710, and pushes the converging ratchet 710 to rotate in the same direction. The converging ratchet 710 then synchronously drives the rotating shaft 790 to rotate via the spline. The rotating shaft 790 drives the cam 720 to rotate. The cam 720, through the linkage of the connecting rod 730 and the swing arm 740, causes the brake band 750 to tighten and lock the clutch drum 400, thus locking the sprocket. As a result, the triggering path of the buffer wear-resistant head 320 and the triggering path of the inertial pendulum 810 are merged into the same braking action through the converging ratchet 710. Either triggering path can independently complete the braking, forming a dual-trigger mutual backup protection mechanism. To release the lock, simply pull the locking pin 910 outwards; the cam 720 will then reset via the spring plate 780. It should be noted that the motion relationship between the first pawl 640 and the second pawl 830 and the confluence ratchet 710 adopts the existing ratchet and pawl matching relationship.

[0042] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0043] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A chainsaw safety protection device with anti-rebound feature, comprising a body (100), a guide plate (200), a clutch drum (400) disposed inside the body (100), and a motor drive unit (500) fixedly connected to the outside of the body (100) and whose output end is fixedly connected to the clutch drum (400), characterized in that: Also includes: An elastic buffer energy absorption mechanism (300) is installed in the tip region of the guide plate (200); The moving component (600) has one end located inside the guide plate (200) and the other end located inside the body (100); A rotating assembly (700) is rotatably connected inside the body (100); The elastic buffer energy absorption mechanism (300) includes a housing (310) fixed to the guide plate (200). The inside of the housing (310) is elastically connected to a buffer wear-resistant head (320) via a first spring (330). Vertical rods (340) are slidably connected to both ends inside the housing (310). A stop rod (350) is fixed between the two vertical rods (340). The bottom end of the stop rod (350) extends slidably into the inside of the guide plate (200). The moving component (600) includes a diagonal bar (610) that abuts against a stop bar (350), the diagonal bar (610) being slidably connected inside a guide plate (200) and elastically connected to the guide plate (200) by a third spring (620).

2. The anti-rebound chainsaw safety protection device according to claim 1, characterized in that: Both ends of the abutment (350) are slidably connected to guide rods (370), and the guide rods (370) are fixed inside the guide plate (200); The outer wall of the guide rod (370) is movably fitted with a second spring (360), the top and bottom ends of the second spring (360) being fixedly connected to the abutment rod (350) and the guide plate (200) respectively.

3. The anti-rebound chainsaw safety protection device according to claim 1, characterized in that: The end of the inclined rod (610) away from the elastic buffer energy absorption mechanism (300) is fixedly connected to a moving rod (630), and the end of the moving rod (630) located inside the body (100) is fixedly connected to a first pawl (640). The first pawl (640) is in contact with the rotating assembly (700).

4. The anti-rebound chainsaw safety protection device according to claim 3, characterized in that: The rotating assembly (700) includes a rotating shaft (790) disposed inside the body (100), and a cam (720) and a converging ratchet (710) are respectively installed at both ends of the outer wall of the rotating shaft (790). The confluence ratchet (710) engages with the first pawl (640).

5. The anti-rebound chainsaw safety protection device according to claim 4, characterized in that: The cam (720) is provided with a spring plate (780) that allows it to elastically return to its original position. The upper end of the spring plate (780) is rotatably connected to a connecting rod (730), and the end of the connecting rod (730) away from the cam (720) is rotatably connected to a swing arm (740).

6. The anti-rebound chainsaw safety protection device according to claim 5, characterized in that: A brake band (750) is fixed to one end of the swing arm (740) away from the connecting rod (730). The brake band (750) is sleeved on the outside of the clutch drum (400) and there is a gap between it and the clutch drum (400). The end of the brake band (750) away from the swing arm (740) is fixed to the inside of the body (100). A limiting spring plate (760) is fixed to the outside of the brake band (750).

7. The anti-rebound chainsaw safety protection device according to claim 6, characterized in that: A positioning block (770) is fixedly connected to one side of the outer wall of the cam (720), and a clip (900) is connected to the outer wall of the positioning block (770). The locking component (900) includes a locking post (910) movably connected to the body (100), and a fifth spring (920) is sleeved on the outer wall of the locking post (910) at one end of the outer side of the body (100). The contact end between the positioning block (770) and the locking post (910) is provided with an angle.

8. The anti-rebound chainsaw safety protection device according to claim 7, characterized in that: One end of the outer wall of the confluence ratchet (710) is provided with a swing assembly (800). The swing assembly (800) includes a fourth spring (850) fixed to the bottom of the inner cavity of the body (100), and an inertial pendulum (810) is fixed to the top of the fourth spring (850).

9. The anti-rebound chainsaw safety protection device according to claim 8, characterized in that: One end of the inertial pendulum (810) is connected to an inclined push plate (820), and the top end of the inclined push plate (820) is fixed with a second pawl (830), which engages with the confluence ratchet (710).

10. The anti-rebound chainsaw safety protection device according to claim 9, characterized in that: One end of the inclined push plate (820) is slidably connected to the inner wall of the body (100) via a spring limiting post (840).

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