Blade concealed shock absorbing lawnmower

Abstract

This invention relates to the field of lawnmower technology and discloses a blade-concealed shock-absorbing lawnmower, including a blade assembly. The blade assembly includes a blade holder housing and several telescopic blades, all of which are slidably mounted inside the blade holder housing. The several telescopic blades are connected by an elastic structure with closed ends. This invention constructs a stable multi-blade synchronous extension and retraction mechanism through the synergy of the elastic structure and the precision guiding mechanism. During operation, the centrifugal force generated by the rotation of the blade assembly overcomes the magnetic constraint, causing the blades to extend synchronously along the limiting strip and the limiting groove, ensuring neat cutting. When not in operation, the blades retract into the blade holder housing under the action of magnetic force, avoiding ground collisions. The blade holder adopts a split design, and a single damaged blade can be replaced individually, greatly reducing maintenance costs. In addition, relying on the dynamic balance of centrifugal force and magnetic force, the blades can automatically retract and avoid hard objects, and the elastic buffer achieves shock absorption, avoiding deformation and damage, and improving operational safety.

Description

Technical Field

[0001] This invention relates to the field of lawnmower technology, specifically to a lawnmower with concealed blades and shock absorption. Background Technology

[0002] In fields such as agricultural planting and garden maintenance, side-mounted lawn mowers have become widely used vegetation trimming equipment due to their portability, flexibility, low operating threshold, and adaptability to complex terrains (such as slopes, shrublands, and field paths).

[0003] The core structure of existing side-mounted lawnmowers typically includes a side-mounted shoulder strap, a powertrain, a drive shaft, a blade assembly, and an operating handle. During operation, the operator suspends the equipment on one side of their body via the shoulder strap and controls the powertrain to start via the operating handle. Power is transmitted to the blade assembly via the drive shaft, causing the exposed rotating blades to rotate at high speed, thus cutting and trimming weeds, low shrubs, and other vegetation.

[0004] However, existing side-mounted lawnmowers still have many defects that need to be addressed in actual use, which seriously affect operational safety, equipment lifespan, and operational efficiency.

[0005] First, there are prominent safety hazards. The blades of existing side-mounted lawnmowers are mostly exposed and fixed structures. When not in operation (such as when moving to the work area or returning to the rest point), the blades are always exposed. Due to the distribution of the equipment's center of gravity and the limitation of the suspension structure, the blades tend to droop naturally, causing the blades to frequently collide and rub against the ground, field ridges, shrubs, etc. This not only easily causes the blades to wear and curl, but may also cause them to bounce and scratch the operator or trip people around them.

[0006] Secondly, during operation, the blades are rigidly connected and cannot avoid hard objects such as rocks and roots, which can easily cause violent collisions. The resulting impact force can not only cause the blades to deform or break, but may also be transmitted to the drive shaft and operating handle, causing the whole machine to vibrate violently, affecting the stability of operation, and even causing operator arm fatigue or accidental injury.

[0007] In addition, most existing side-mounted lawnmowers use an integrated blade holder structure, with the internal blades fixedly connected to the blade holder. If any part of the blade is damaged, the entire blade needs to be replaced, which significantly increases maintenance costs.

[0008] Therefore, this invention proposes a blade-concealed shock-absorbing lawnmower. Summary of the Invention

[0009] The purpose of this invention is to provide a blade-concealed shock-absorbing lawnmower to solve the problems mentioned in the background art.

[0010] To achieve the above objectives, the present invention provides the following technical solution: a blade-concealed shock-absorbing lawnmower, comprising a blade assembly, the blade assembly comprising a blade holder housing and a plurality of telescopic blades, the telescopic blades being slidably mounted inside the blade holder housing, the plurality of telescopic blades being connected by an elastic structure with closed ends, a magnetic mechanism one being mounted on the side of the telescopic blades near the inside of the blade holder housing, and a corresponding magnetic mechanism two with opposite magnetic properties being provided inside the blade holder housing; after the lawnmower is started, the telescopic blades, driven by the centrifugal force generated by the rotation of the blade holder housing, break free from the magnetic constraint and extend synchronously out of the blade holder housing under the linkage of the elastic structure; after the lawnmower is turned off, the telescopic blades retract synchronously back into the blade holder housing under the magnetic attraction of the magnetic mechanism one and the magnetic mechanism two.

[0011] Preferably, each telescopic cutter is fixedly connected to a magnetic tailstock on the side near the inside of the cutter holder housing, and the magnetic tailstock has symmetrically opened grooves, with the elastic structure assembled inside the grooves.

[0012] Preferably, a magnetic post is fixedly connected to the center of the tool holder housing, and the magnetic post is attracted to the magnetic tailstock.

[0013] Preferably, the length of the channel is greater than the length of the corresponding assembly section of the elastic structure, so as to allow for the movement of the elastic structure.

[0014] Preferably, a limiting strip is fixedly connected between the magnetic column and the inner wall of the tool holder housing, and a limiting groove is correspondingly formed on the surface of each magnetic tailstock, with the limiting strip and the limiting groove being slidably assembled.

[0015] Preferably, the tool holder housing is a split structure, consisting of an upper housing and a lower housing joined together.

[0016] Preferably, the magnetic column has a split structure, corresponding to the split configuration of the tool holder housing, and consists of an upper column and a lower column.

[0017] Preferably, the surface of the upper column is provided with a protrusion, and the surface of the lower column is provided with a corresponding recess. During assembly, the protrusion and the recess are matched to achieve quick positioning. The upper column is fixedly connected to the upper housing, and the lower column is fixedly connected to the lower housing.

[0018] Preferably, housing mounting ears are installed on the surfaces of both the upper and lower housings, and positioning pins are fitted between adjacent housing mounting ears to achieve positioning and fixing of the upper and lower housings.

[0019] Preferably, the lawnmower further includes a drive shaft, an operating handle, and a power assembly. The drive shaft connects the blade assembly and the power assembly. The operating handle is mounted on the drive shaft. A protective cover is installed on the outside of the blade assembly. The drive shaft and the blade holder housing are installed together.

[0020] Preferably, the side of the magnetic tailstock near the tool holder housing is made of neodymium iron boron permanent magnet material to achieve magnetic attraction, while the other side that comes into contact with the elastic structure is made of polyurethane wear-resistant material, and the surface of this side is coated with polytetrafluoroethylene lubricating and wear-resistant coating to effectively reduce frictional loss when repeatedly contacting the elastic structure.

[0021] Preferably, the elastic structure is either an elastic rope or a spring. If it is an elastic rope, its material is an aramid fiber braided layer covered with a polyurethane elastic core, which has both high elasticity and wear resistance and anti-aging properties. If it is a spring, its material is 65Mn wear-resistant spring steel, which can withstand the repeated deformation of the telescopic cutter's high-frequency extension and retraction and is not easy to wear and break.

[0022] Preferably, the corresponding position of the housing mounting lug is pre-drilled with a coaxial threaded hole, and the positioning pin is specifically a combination of an external hexagonal bolt and a lock nut. After the bolt passes through the threaded hole of the adjacent housing mounting lug, the lock nut is tightened to achieve a stable and detachable connection between the upper housing and the lower housing.

[0023] Preferably, the telescopic cutter achieves stable sliding within the cutter holder housing through the sliding engagement of the limiting strip and the limiting groove. The engagement of the limiting strip and the limiting groove guides and restricts the telescopic cutter from displacement in directions other than radial extension and retraction along the cutter holder housing, ensuring the smoothness and synchronicity of the extension and retraction actions of the telescopic cutter.

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] 1. This invention utilizes an elastic structure and a precise guiding mechanism to construct a stable multi-blade synchronous extension and retraction mechanism. During operation, the centrifugal force generated by the rotation of the blade assembly overcomes magnetic constraints, causing the blades to extend synchronously along the limiting strip and limiting groove, ensuring neat cutting. When not in operation, the blades retract into the blade holder housing under the action of magnetic force, avoiding ground collisions. The blade holder adopts a split design, allowing individual blades to be replaced separately if damaged, significantly reducing maintenance costs. Furthermore, relying on the dynamic balance between centrifugal force and magnetic force, the blades can automatically retract and avoid hard objects, combined with elastic buffering to achieve shock absorption, prevent deformation and damage, and improve operational safety.

[0026] 2. Traditional side-mounted lawnmowers' exposed blades are prone to safety issues such as collision scratches and accidental injuries from bouncing. This invention comprehensively avoids these hazards through structural design. When not in use, the blades retract into the blade holder housing with no cutting parts exposed. Even when the blade head hangs down and touches the ground, only the outer part of the housing contacts the ground, completely eliminating the risks of bouncing scratches or snagging on obstacles caused by the blade colliding with the ground, ensuring the safety of the operator during movement. During operation, the synchronous extension and retraction of the blades creates a stable dynamic balance, combined with the elastic avoidance function, avoiding blade bouncing caused by hard collisions, reducing the probability of accidental injury to oneself or surrounding personnel. At the same time, the protective cover on the outside of the blade assembly further shields the non-cutting area, preventing vegetation debris from flying, forming double safety protection, suitable for the safety requirements of operation on complex terrains such as slopes and bushes.

[0027] 3. This invention addresses the pain point of severe vibration in traditional lawnmowers by constructing a multi-dimensional vibration reduction system, significantly improving the user experience. On one hand, the synchronous extension and retraction of the blades ensures dynamic balance during blade rotation, avoiding localized vibrations caused by uneven force on individual blades. On the other hand, the deformation of the elastic structure buffers the instantaneous stress from blade extension and collision, while the wear-resistant coating of the magnetic tailstock reduces frictional vibration. Combined with the nested vibration reduction structure of the drive shaft and the flexible coupling, the transmission of vibration to the operating handle is effectively blocked. Compared to traditional equipment, the vibration amplitude of this device is significantly reduced during operation, significantly alleviating operator arm fatigue and extending continuous working time. The stable vibration reduction effect also improves cutting accuracy and avoids cutting trajectory deviation caused by vibration, making it particularly suitable for scenarios with high requirements for work quality, such as fine garden pruning.

[0028] 4. Traditional lawnmower blades are prone to non-operational wear due to exposed blades, and hard impacts exacerbate component damage. The structural design of this invention significantly reduces equipment wear. When not in operation, the blades are concealed and stored, avoiding friction and wear with the ground and obstacles, thus extending the blades' sharpness retention time. During operation, the elastic avoidance function reduces hard impacts between the blades and objects, lowering the probability of blade deformation and curling. Simultaneously, the synchronous telescopic and shock-absorbing design reduces the impact on transmission components such as the blade holder and drive shaft. Combined with the elastic structure, this further enhances the durability of core components. Furthermore, the split design facilitates timely cleaning of dust accumulation inside the blade holder, preventing dust from affecting transmission efficiency. These multiple aspects extend the overall lifespan of the machine and reduce the total lifespan cost of the equipment.

[0029] 5. The structural design of this invention is fully adaptable to complex outdoor operations and mobile scenarios, possessing strong practicality. In the non-operational state, the retracted blades make the blade assembly more compact, preventing it from getting caught on surrounding shrubs or field ridges when carried sideways, significantly improving portability. Compared to traditional integrated blade holders, the modular design of this device allows for disassembly and maintenance without specialized tools, and operators can learn to use it after simple training, lowering the barrier to operation and maintenance. Whether for home gardening pruning, small farm operations, or professional landscaping maintenance, this device can meet the needs of different users and has broad application prospects. Attached Figure Description

[0030] Figure 1 This is a three-dimensional schematic diagram of the main structure of the present invention in a contracted state;

[0031] Figure 2 This is a three-dimensional schematic diagram of the cutter head assembly of the present invention in a retracted state;

[0032] Figure 3 This is a cross-sectional plan view of the cutter head assembly of the present invention in its retracted state;

[0033] Figure 4 This is a cross-sectional perspective view of the cutter head assembly of the present invention in its retracted state;

[0034] Figure 5 This is a three-dimensional schematic diagram of the shrink cutter of the present invention;

[0035] Figure 6 This is a three-dimensional schematic diagram of the main structure of the present invention in an expanded state;

[0036] Figure 7 This is a three-dimensional schematic diagram of the cutter head assembly of the present invention in an expanded state;

[0037] Figure 8 This is a cross-sectional perspective view of the cutter head assembly of the present invention in an expanded state;

[0038] Figure 9 This is a three-dimensional schematic diagram of the cutter head assembly of the present invention in a split state.

[0039] In the picture:

[0040] 1. Drive shaft; 2. Cutter head assembly; 21. Cutter holder housing; 211. Upper housing; 212. Lower housing; 22. Telescopic cutter; 221. Magnetic tailstock; 222. Limiting groove; 223. Elastic structure; 224. Limiting strip; 23. Protective cover; 24. Magnetic column; 241. Upper column; 242. Lower column; 25. Housing mounting lug; 26. Positioning pin; 3. Operating handle; 4. Power assembly. Detailed Implementation

[0041] 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 protection scope of the present invention.

[0042] It should be noted that the drive shaft 1 in this invention only provides power transmission and shock absorption functions, which can be achieved through existing transmission component structures with nested inner and outer rods, rubber shock-absorbing sleeves, and flexible couplings. The cutter head assembly 2 only provides cutting operation functions. The magnetic force between the magnetic tailstock 221 and the magnetic column 24 only provides constraint and reset functions for blade extension and retraction, which can be achieved through existing neodymium iron boron permanent magnet pole attraction structure to form a dynamic balance between centrifugal force and magnetic attraction force to control the timing of extension and retraction. The elastic structure 223 only provides multi-blade synchronous linkage and extension and retraction buffer functions, which can be achieved through existing aramid fiber elastic rope or 65Mn spring steel spring elastic deformation structure to ensure the synchronicity of blade extension and retraction and the collision buffering effect.

[0043] The working principles of the above components (such as the vibration damping principle of the elastic coupling of the drive shaft 1, the vibration buffering principle of the nested rod, the centrifugal force driven telescopic principle of the cutter head assembly 2, the dynamic balance damping principle of the multi-blade, the magnetic pole attraction constraint and reset principle of the magnetic tailstock 221 and the magnetic column 24, the elastic deformation linkage principle and impact buffering principle of the elastic structure 223, etc.) and their specific structures (such as the rod material of the drive shaft 1, the hardness of the damping sleeve and the coupling model, the housing size of the cutter head assembly 2, the number and distribution spacing of the blades, the permanent magnet model, magnetic strength and installation spacing of the magnetic tailstock 221 and the magnetic column 24, the elastic coefficient of the elastic structure 223, the size and material parameters of the rope / spring, etc.) are all existing technologies. Given the universality of these structures, their specific principles will not be described in detail below.

[0044] Please see Figures 1 to 4 The present invention provides an embodiment:

[0045] A blade-concealed shock-absorbing lawnmower includes a blade assembly 2, which comprises a blade holder housing 21 and several telescopic blades 22. The telescopic blades 22 are slidably mounted inside the blade holder housing 21. The several telescopic blades 22 are connected by an elastic structure 223 that closes at both ends. A magnetic mechanism 1 is mounted on the side of the telescopic blade 22 closest to the inside of the blade holder housing 21. A corresponding magnetic mechanism 2 with opposite magnetic properties is provided inside the blade holder housing 21. When the lawnmower is started, the telescopic blades 22 are released from the magnetic constraint by the centrifugal force generated by the rotation of the blade holder housing 21, and simultaneously extend out of the blade holder housing 21 under the linkage of the elastic structure 223. When the lawnmower is turned off, the telescopic blades 22 simultaneously retract back into the blade holder housing 21 under the magnetic attraction of the magnetic mechanism 1 and the magnetic mechanism 2.

[0046] like Figure 4 and Figure 5 As shown, each telescopic cutter 22 is fixedly connected to a magnetic tailstock 221 on one side near the inside of the cutter housing 21. The magnetic tailstock 221 has symmetrically opened grooves, and the elastic structures 223 are all assembled inside the grooves.

[0047] like Figure 3 and Figure 4 As shown, a magnetic post 24 is fixedly connected to the center of the tool holder housing 21, and the magnetic post 24 is attracted to the magnetic tailstock 221.

[0048] like Figure 5 As shown, the length of the channel is greater than the length of the assembly section corresponding to the elastic structure 223, so as to reserve the movement margin of the elastic structure 223.

[0049] like Figure 4 As shown, a limiting strip 224 is fixedly connected between the magnetic column 24 and the inner wall of the tool holder housing 21. A limiting groove 222 is opened on the surface of each magnetic tailstock 221, and the limiting strip 224 and the limiting groove 222 are slidably assembled.

[0050] like Figure 9 As shown, the tool holder housing 21 has a split structure, consisting of an upper housing 211 and a lower housing 212. The magnetic column 24 has a split structure, corresponding to the split configuration of the tool holder housing 21, consisting of an upper column 241 and a lower column 242. The surface of the upper column 241 has protrusions, and the surface of the lower column 242 has corresponding recesses. During assembly, the protrusions and recesses cooperate to achieve quick positioning. The upper column 241 is fixedly connected to the upper housing 211, and the lower column 242 is fixedly connected to the lower housing 212. Housing mounting ears 25 are installed on the surfaces of both the upper housing 211 and the lower housing 212. Positioning pins 26 are installed between adjacent housing mounting ears 25 to achieve positioning and fixing of the upper housing 211 and the lower housing 212.

[0051] like Figure 1 and Figure 6As shown, the lawnmower also includes a drive shaft 1, an operating handle 3, and a power assembly 4. The drive shaft 1 connects the blade assembly 2 and the power assembly 4. The operating handle 3 is mounted on the drive shaft 1. A protective cover 23 is installed on the outside of the blade assembly 2. The drive shaft 1 and the blade housing 21 are installed together.

[0052] It should be noted that the magnetic tailstock 221 is made of neodymium iron boron permanent magnet material on the side near the cutter housing 21 to achieve magnetic attraction, while the other side that contacts the elastic structure 223 is made of polyurethane wear-resistant material, and the surface of this side is coated with a polytetrafluoroethylene lubricating and wear-resistant coating, effectively reducing frictional loss during repeated contact with the elastic structure 223. The elastic structure 223 is specifically either an elastic rope or a spring. If it is an elastic rope, its material is an aramid fiber braided layer covering a polyurethane elastic core, which has both high elasticity and wear resistance and anti-aging properties; if it is a spring, its material is 65Mn wear-resistant spring steel, which can withstand the repeated deformation of the telescopic cutter 22 during high-frequency extension and retraction and is not easily worn or broken. The housing mounting lug 25 has a pre-drilled coaxial threaded hole at the corresponding position. The positioning pin 26 is a combination of an external hexagonal bolt and a lock nut. After the bolt passes through the threaded hole of the adjacent housing mounting lug 25, the lock nut is tightened to achieve a stable and detachable connection between the upper housing 211 and the lower housing 212. The telescopic cutter 22 achieves stable sliding inside the cutter holder housing 21 through the sliding engagement of the limiting strip 224 and the limiting groove 222. The engagement of the limiting strip 224 and the limiting groove 222 guides and restricts the telescopic cutter 22 from moving in any direction other than radial extension and retraction along the cutter holder housing 21, ensuring the smoothness and synchronicity of the extension and retraction of the telescopic cutter 22.

[0053] Specifically, in the initial static state, the telescopic cutter 22 is in the retracted position inside the cutter housing 21. At this time, the magnetic tailstock 221 and the magnetic column 24 form a stable constraint through magnetic attraction, ensuring that the telescopic cutter 22 will not move arbitrarily. The elastic structure 223 is assembled in the groove of the magnetic tailstock 221 and is in a naturally extended state. The reserved movement margin in the groove provides space for subsequent deformation.

[0054] When the operation starts, the operator triggers the power assembly 4 through the operating handle 3. The torque output by the power assembly 4 is stably transmitted to the cutter head assembly 2 through the transmission shaft 1, which drives the cutter holder housing 21 to rotate synchronously.

[0055] As the rotational speed of the cutter housing 21 gradually increases, the centrifugal force generated by the telescopic cutter 22 and the magnetic tailstock 221 rotating with the cutter housing 21 continues to increase. When the centrifugal force is greater than the magnetic attraction constraint force between the magnetic column 24 and the magnetic tailstock 221, the telescopic cutter 22 begins to slide radially outward along the cutter housing 21. During this process, the limiting strip 224 slides synchronously along the limiting groove 222. Through the cooperation of the two, the displacement of the telescopic cutter 22 in other directions except for radial extension is strictly limited to prevent jamming or deviation.

[0056] Since several telescopic cutters 22 are connected by an elastic structure 223 with closed ends, the elastic structure 223 undergoes elastic deformation synchronously under the linkage of sliding of a single telescopic cutter 22. With the help of the reserved movement of the groove, all telescopic cutters 22 are driven to extend out of the cutter holder housing 21 synchronously until the end of the limiting groove 222 abuts against the limiting strip 224. The telescopic cutter 22 reaches its maximum extension stroke. At this time, the cutting end of the telescopic cutter 22 is fully exposed, and the protective cover 23 outside the cutter head assembly 2 can block the non-cutting area and prevent material from splashing.

[0057] It should be added that the invention also improves the shock absorption performance by using a concealed telescopic cutter 22, but it is still necessary to clarify the core reason for the severe vibration of the telescopic cutter 22 in the prior art: the telescopic cutter 22 of existing lawnmowers is mostly fixed, and the impact force of the rotational cutting will be directly transmitted to the whole machine.

[0058] This device achieves elastic buffering and shock absorption during the cutting process through a dynamic balance mechanism of centrifugal force and magnetic constraint force, fundamentally solving the problem of severe vibration of the telescopic cutter 22 in the prior art. In the prior art, the telescopic cutter 22 is mostly rigidly fixed or simply telescopic. If it encounters hard objects such as stones or hard roots during the cutting operation, the telescopic cutter 22 will directly collide with the hard object. Moreover, due to the lack of a buffer structure, the huge impact force generated by the collision will be directly transmitted to the cutter holder and the whole machine, causing severe vibration.

[0059] Meanwhile, the rigidly connected telescopic cutter 22 cannot adaptively avoid hard objects, which not only easily leads to deformation and breakage of the telescopic cutter 22, but also the vibration will affect the cutting stability and even be transmitted to the operating handle 3, affecting the safety of operation.

[0060] The core improvement of this device lies in the fact that the telescopic cutter 22 is always in a dynamic balance of "centrifugal force - magnetic attraction constraint force". When it cuts a hard object, the reverse impact force generated by the object on the cutting end of the telescopic cutter 22 will break the original balance, causing the telescopic cutter 22 to tend to retract into the cutter holder housing 21. At this time, the magnetic attraction between the magnetic column 24 and the magnetic tailstock 221 will form an elastic buffer resistance. Combined with the deformation buffer of the elastic structure 223, it will drive the telescopic cutter 22 to retract inward briefly, realizing adaptive avoidance of hard objects and avoiding hard collision between the telescopic cutter 22 and hard objects.

[0061] At the same time, the centrifugal force will quickly drive the telescopic cutter 22 to reset and continue cutting after it avoids the impact. The whole process transforms the hard impact into an elastic buffer transition, which greatly reduces the vibration generated by the collision.

[0062] In addition, the dynamic balance formed by synchronous telescopic extension avoids local vibration caused by uneven force on a single telescopic cutter 22, and ultimately achieves synergistic optimization of concealed telescopic extension and multi-dimensional shock absorption, which not only improves cutting stability, but also extends the service life of the telescopic cutter 22 and the whole machine.

[0063] During operation, the elastic structure 223 remains taut to ensure the synchronization of the telescopic cutter 22.

[0064] After the operation is completed, the operator turns off the power unit 4 by operating handle 3. The rotation speed of the cutter housing 21 gradually decreases, and the centrifugal force decays until it disappears. At this time, the magnetic attraction constraint force of the magnetic column 24 and the magnetic tailstock 221 takes over again, driving the telescopic cutter 22 to slide radially inward. The elastic structure 223 synchronously resets and retracts. Finally, the telescopic cutter 22 is completely retracted into the cutter housing 21, completing one operation cycle.

[0065] In addition, the blade holder housing 21 adopts a split design of upper housing 211 and lower housing 212. When it is necessary to clean the dust or repair the telescopic cutter 22, the operator can unscrew the positioning pin 26 (hexagonal bolt and anti-loosening nut assembly) between the housing mounting lugs 25, release the locking and fixing of the upper housing 211 and the lower housing 212, and then separate the upper housing 211 with the upper column 241 and the lower housing 212 with the lower column 242. This will fully expose the telescopic cutter 22, magnetic tailstock 221 and other components inside the blade holder housing 21, making it convenient to carry out targeted cleaning or repair operations.

[0066] This split design has significant advantages over existing technologies. In existing technologies, the cutter holder is mostly an integrated structure. Once a component of the telescopic cutter 22 is damaged, it is often necessary to replace the cutter holder and the entire internal assembly of all telescopic cutters 22, resulting in high maintenance costs and cumbersome operation.

[0067] The modular design allows for the individual disassembly and assembly of the telescopic cutter 22. Maintenance can be completed simply by replacing the faulty telescopic cutter 22, which significantly reduces the later maintenance costs of the equipment, shortens the repair time, and improves the overall cost-effectiveness of the equipment.

[0068] It should be added that in the existing side-mounted lawnmower technology, the telescopic cutter 22 is usually an exposed fixed structure. When not in operation (such as when returning to a rest point or moving to a new mowing area), the operator needs to carry the equipment on his / her body.

[0069] However, due to the limitations of the center of gravity distribution and suspension structure of the side-mounted equipment, the cutter head assembly 2 will naturally droop. Furthermore, since the telescopic cutter 22 is always exposed, it is very easy for the telescopic cutter 22 to collide with the ground during movement. On the one hand, outdoor movement paths (such as field paths and slopes) are often uneven, and the swaying of the operator's body when walking will cause the side-mounted telescopic cutter 22 to swing, resulting in the exposed telescopic cutter 22 frequently rubbing against the ground.

[0070] On the other hand, some operators may drag the equipment arbitrarily to save effort, or fail to find a flat support point when placing it, which may cause the telescopic cutter 22 to directly contact the ground.

[0071] The negative impacts of such collisions are significant: First, they pose a prominent safety hazard. When the exposed telescopic cutter 22 collides with the ground, it may bounce, easily scratching the operator's legs and feet, or tripping nearby personnel. Second, they cause severe equipment wear. The hard friction between the telescopic cutter 22 and the ground will cause wear and tear on the cutting edge, curling, and even deformation of the telescopic cutter 22. At the same time, the impact force generated by the collision will be transmitted to components such as the cutter holder and drive shaft 1, aggravating the wear of transmission components such as bearings and gears, and shortening the service life of the equipment. Third, they affect the efficiency of subsequent operations. The damaged telescopic cutter 22 will reduce the cutting sharpness, requiring frequent shutdowns for sharpening or replacement, increasing maintenance costs.

[0072] The present invention solves this problem at its root by using the concealed telescopic design of the telescopic cutter 22. In the non-operational state, the telescopic cutter 22 is completely retracted into the cutter holder housing 21 under the magnetic attraction constraint of the magnetic column 24 and the magnetic tailstock 221, with no cutting parts exposed. Even if the cutter head assembly 2 drops to the ground during movement, it is the external structure of the cutter holder housing 21 that contacts the ground, not the telescopic cutter 22.

[0073] This design not only completely avoids the safety hazards caused by the collision between the telescopic cutter 22 and the ground, ensuring the safety of the operator when carrying it, but also avoids non-operational wear of the telescopic cutter 22, reducing the frequency and cost of equipment maintenance. At the same time, the overall volume of the retracted cutter head assembly 2 is more regular, making it less likely to get caught on surrounding obstacles (such as bushes and field ridges) when moving, improving the portability in non-operational states, and is especially suitable for the movement needs of complex outdoor terrain.

[0074] 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 a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0075] 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 blade-concealed shock-absorbing lawnmower, comprising a blade assembly (2), characterized in that: The blade assembly (2) includes a blade holder housing (21) and several telescopic cutters (22). The telescopic cutters (22) are all slidably mounted inside the blade holder housing (21). The several telescopic cutters (22) are connected by an elastic structure (223) with closed head and tail. A magnetic mechanism one is mounted on the side of the telescopic cutter (22) close to the inside of the blade holder housing (21). A magnetic mechanism two with opposite magnetic properties is correspondingly provided inside the blade holder housing (21). After the lawnmower is started, the telescopic cutter (22) is freed from the magnetic constraint by the centrifugal force generated by the rotation of the blade holder housing (21) and extends out of the blade holder housing (21) synchronously under the linkage of the elastic structure (223). After the lawnmower is turned off, the telescopic cutter (22) retracts back into the blade holder housing (21) synchronously under the magnetic attraction of the magnetic mechanism one and the magnetic mechanism two. Each telescopic cutter (22) is fixedly connected to a magnetic tailstock (221) on the side near the inside of the cutter holder housing (21). The magnetic tailstock (221) has symmetrical slots, and the elastic structure (223) is assembled inside the slots. A magnetic column (24) is fixedly connected to the center of the blade holder housing (21), and the magnetic column (24) is attracted to the magnetic tailstock (221).

2. The blade-concealed shock-absorbing lawnmower according to claim 1, characterized in that: The length of the channel is greater than the length of the assembly section corresponding to the elastic structure (223) to allow for the movement of the elastic structure (223).

3. A blade-concealed shock-absorbing lawnmower according to claim 1, characterized in that: Limiting strips (224) are fixedly connected between the magnetic column (24) and the inner wall of the tool holder housing (21). A limiting groove (222) is opened on the surface of each magnetic tailstock (221). The limiting strip (224) and the limiting groove (222) are slidably assembled.

4. A blade-concealed shock-absorbing lawnmower according to any one of claims 1-3, characterized in that: The tool holder housing (21) is a split structure, consisting of an upper housing (211) and a lower housing (212) joined together.

5. A blade-concealed shock-absorbing lawnmower according to claim 4, characterized in that: The magnetic column (24) is a split structure, corresponding to the split arrangement of the tool holder housing (21), and consists of an upper column (241) and a lower column (242).

6. A blade-concealed shock-absorbing lawnmower according to claim 5, characterized in that: The surface of the upper column (241) is provided with a protrusion, and the surface of the lower column (242) is provided with a corresponding recess. During assembly, the protrusion and the recess are matched to achieve quick positioning. The upper column (241) is fixedly connected to the upper shell (211), and the lower column (242) is fixedly connected to the lower shell (212).

7. A blade-concealed shock-absorbing lawnmower according to claim 4, characterized in that: Both the upper housing (211) and the lower housing (212) are equipped with housing mounting ears (25), and positioning pins (26) are fitted between adjacent housing mounting ears (25) to achieve positioning and fixing of the upper housing (211) and the lower housing (212).

8. A blade-concealed shock-absorbing lawnmower according to claim 1, characterized in that: The lawnmower also includes a drive shaft (1), an operating handle (3) and a power assembly (4). The drive shaft (1) connects the blade assembly (2) and the power assembly (4). The operating handle (3) is mounted on the drive shaft (1). The blade assembly (2) is equipped with a protective cover (23). The drive shaft (1) and the blade holder housing (21) are installed together.

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