A saddle type mower and a double-knife chassis mechanism thereof

Abstract

This application relates to a ride-on lawnmower and its dual-blade chassis mechanism, including a blade disc and two cutting blade assemblies. Each cutting blade assembly includes a mounting base, a rotating shaft, blades, a locking element, and a rotation-limiting element. The blade disc has two mounting slots, and the mounting base is detachably fixed within these slots. The rotating shaft is rotatably connected to the mounting base, and the locking element locks the rotating shaft and blades. The rotation-limiting element includes a fixing block, a insertion rod, and an adjusting rod. The outer wall of the mounting base has several inner grooves, and the fixing block is detachably connected to one of these grooves. The adjusting rod coaxially fixes one end of the insertion rod. The fixing block has a threaded hole into which the adjusting rod is threaded, with its end protruding and having a cross-shaped groove. The mounting base has a movable slot for the insertion rod to enter, and the rotating shaft has a slot for matching the insertion rod. An adjustment gap is left between the fixing block and the bottom wall of the inner grooves, ensuring the insertion rod remains within the movable slot. When changing blades, rotating the adjusting rod causes the insertion rod to insert into the slot, limiting rotation and preventing the two blades from moving together, thus improving safety. The detachable fixing block facilitates the installation and removal of the rotation-limiting element.

Description

Technical Field

[0001] This utility model relates to the field of lawnmowers, and in particular to a ride-on lawnmower and its double-blade chassis mechanism. Background Technology

[0002] A lawnmower, also known as a lawn trimmer, is used for mowing lawns. There are two types of lawnmowers: single-blade and double-blade. Double-blade lawnmowers have the advantage of mowing large areas of grass. In existing double-blade lawnmowers, the two blades are arranged side by side on the blade disc, which is mounted horizontally on the frame. In order to reduce the number of drive sources, a belt or gear mechanism is used to link the two blade shafts together, using a single drive source to drive the two blades to rotate.

[0003] Blades wear down during use and need to be replaced periodically. During the disassembly of one blade, it may rotate. Because the two blades are linked by a belt or gear, this can cause the other blade to rotate as well. This means that operators must not only be aware of the rotating blade being handled but also be constantly vigilant about the safety risks posed by the rotation of the other blade due to the linkage mechanism. For example, the blade might cut hands or other limbs. Therefore, there are safety hazards when replacing blades, requiring extra caution. Utility Model Content

[0004] To enable operators to change blades more safely, this application provides a ride-on lawnmower and its dual-blade chassis mechanism.

[0005] The double-blade chassis mechanism provided in this application adopts the following technical solution:

[0006] A dual-blade chassis mechanism includes a blade disc and two cutting blade assemblies. Each cutting blade assembly includes a mounting base, a rotating shaft, a blade, a locking element, and a rotation limiting element. The blade disc has two mounting slots. The mounting base is detachably fixed to the blade disc, and the two mounting bases are respectively located in the two mounting slots. The rotating shaft is rotatably connected to the mounting base along a vertical axis. The locking element is used to lock the rotating shaft and the blade. The rotation limiting element includes a fixing block, a plug rod, and an adjusting rod. The outer wall of the mounting base has a plurality of recessed grooves formed sequentially along the circumferential direction. The fixing block is detachably connected to the recessed grooves.

[0007] The adjusting rod is coaxially fixed to one end of the insert rod. A threaded hole is provided through the fixing block. The adjusting rod has threads and is threaded into the threaded hole. The end of the adjusting rod extends out of the threaded hole and has a cross groove. The mounting base has a movable groove for the insert rod to enter. The rotating shaft has at least one slot that matches the end of the insert rod. An adjustment gap is left between the fixing block and the bottom wall of the inner groove. The insert rod is located on the side of the fixing block facing the adjustment gap, and the insert rod is always inserted into the movable groove.

[0008] By adopting the above technical solution, when one of the blades needs to be replaced, the adjusting rod can be rotated via the cross groove, causing the insert rod to move and insert into the slot of the rotating shaft. The engagement between the insert rod and the slot restricts the rotation of the rotating shaft. At this point, even if the two blades were originally connected by a linkage mechanism, the shaft with its rotation restricted will not cause the other blade to rotate. The operator only needs to focus on disassembling the current blade without needing to be wary of the linked rotation of the other blade, reducing safety hazards and improving safety during blade replacement. Simultaneously, the fixing block is detachably connected to the inner groove, facilitating the installation or removal of the rotation restriction component as needed.

[0009] Preferably, the two ends of the fixing block are respectively formed with mounting winglets parallel to the inner walls of the inner groove, and the mounting winglets are fixed to the mounting base by screws.

[0010] By adopting the above technical solution, the mounting wing is parallel to the inner walls on both sides of the groove, increasing the contact area between the fixing block and the mounting base, making the fixing block more securely fixed to the mounting base. The screw connection method is simple to operate, facilitates the installation and removal of the fixing block, ensures that the rotation limiter is not easily loosened during use, and improves the reliability of the overall structure.

[0011] Preferably, the diameter of the insertion rod is larger than the diameter of the adjusting rod. When the adjusting rod is rotated to the point where the end of the insertion rod away from the rotating shaft abuts against the fixing block, the end of the insertion rod is positioned away from the slot.

[0012] By adopting the above technical solution, the diameter of the insertion rod is larger than that of the adjusting rod. When the adjusting rod is rotated to the point where the end of the insertion rod away from the rotating shaft is pressed against the fixing block, the end of the insertion rod is away from the slot. At this time, the state of the insertion rod is stable, the rotation limiter does not restrict the rotating shaft, and does not affect the normal operation of the cutting blade assembly.

[0013] Preferably, an annular groove is coaxially formed on the end face of the insertion rod facing the adjusting rod. A spring is provided in the annular groove, and the two ends of the spring are respectively pressed against the bottom wall of the annular groove and the fixing block. The thread on the adjusting rod is located at the end of the adjusting rod close to the insertion rod. When the adjusting rod rotates until the thread disengages from the threaded hole, the spring drives the insertion rod to always move towards the rotating shaft side.

[0014] By adopting the above technical solution, the spring setting allows the spring to automatically drive the insert rod to always move towards the side of the rotating shaft when the adjusting rod rotates to the point where the thread disengages from the threaded hole. Then, the operator rotates the blade to make the slot face the movable slot, and the end of the insert rod can be automatically inserted into the slot, which improves the convenience of the limited rotation operation.

[0015] Preferably, a force-applying ring is coaxially fixed on the outer wall of the insertion rod, and the force-applying ring is always located within the adjustment gap.

[0016] By adopting the above technical solution, the force ring provides the operator with a convenient point of force application. When it is necessary to adjust the insertion rod away from the slot, the force ring needs to be manually turned to move the insertion rod away from the slot, and then the adjusting rod is rotated again to make the adjusting rod threaded onto the fixing block.

[0017] Preferably, the locking component includes a nut and a screw. The screw is integrally formed at the bottom end of the rotating shaft and extends out of the mounting seat. The top end of the screw has a spline, and the blade has a keyway in the middle that matches the spline. The nut is threaded onto the screw and abuts against the blade.

[0018] By adopting the above technical solution, the screw and nut mechanism enables quick locking and disassembly of the blade and shaft, while the spline and keyway mechanism ensures that the blade rotates synchronously with the shaft, improving cutting efficiency. This locking method has a simple structure and a stable connection, facilitating quick blade replacement by operators while ensuring blade stability during operation.

[0019] Preferably, the blade is arranged in a straight line, and both ends of the blade are bent upwards to form a cutting section with a notch.

[0020] By adopting the above technical solution, the contact area between the blade and the grass is increased and the cutting force is enhanced, which can cut weeds more efficiently. The bent structure design can also reduce the entanglement of grass clippings during the cutting process, thereby improving the grass cutting effect and the service life of the blade.

[0021] The technical solution for a ride-on lawnmower provided in this application is as follows:

[0022] A ride-on lawnmower includes a dual-blade chassis mechanism.

[0023] The main technical effects of this utility model are reflected in the following aspects:

[0024] 1. When it is necessary to replace one of the blades, the adjusting rod can be rotated through the cross groove to move the insert rod and insert it into the slot of the rotating shaft. The engagement between the insert rod and the slot restricts the rotation of the rotating shaft. At this time, even if the two blades were originally connected by a linkage mechanism, the rotating shaft with its rotation restricted will not drive the other blade to rotate. The operator only needs to focus on the disassembly of the current blade and does not need to be wary of the linkage rotation of the other blade, reducing safety hazards and improving safety when replacing blades. At the same time, the fixing block is detachably connected to the inner groove, which facilitates the installation or removal of the rotation restriction component as needed.

[0025] 2. The spring in this utility model allows the spring to automatically drive the insert rod to always move toward the rotating shaft when the adjusting rod rotates to the point where the thread disengages from the threaded hole. Then, the operator can rotate the blade to make the slot face the movable slot, and the end of the insert rod can be automatically inserted into the slot, which improves the convenience of the limited rotation operation. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the transmission connection between two cutting blade assemblies in Embodiment 1 of this application.

[0027] Figure 2 This is a schematic diagram of the assembly of the cutter head and two cutting blade assemblies in one embodiment of this application.

[0028] Figure 3 This is a schematic diagram of the assembly of the cutter head and two cutting blade assemblies from another angle in one embodiment of this application.

[0029] Figure 4 This is a schematic diagram of the assembly of the blade in Embodiment 1 of this application.

[0030] Figure 5 It is along Figure 4 A cross-sectional view along line AA in the middle.

[0031] Figure 6 yes Figure 5 Enlarged view of point B in the middle.

[0032] Figure 7 This is a schematic diagram of the overall structure of Embodiment 2 of this application.

[0033] Explanation of reference numerals in the attached drawings: 1. Cutter head; 11. Mounting slot; 12. Auxiliary wheel; 2. Cutting blade assembly; 21. Mounting base; 211. Inner groove; 212. Movable groove; 22. Rotating shaft; 221. Slot; 23. Blade; 231. Keyway; 232. Cutting section; 233. Notch; 24. Bearing; 3. Locking element; 31. Nut; 32. Screw; 33. Spline; 4. Rotation limiter; 41. Fixing block; 411. Mounting wing; 412. Threaded hole; 42. Insert rod; 421. Ring groove; 43. Adjusting rod; 431. Cross groove; 44. Adjusting clearance; 45. Spring; 46. Force ring. Detailed Implementation

[0034] The following is in conjunction with the appendix Figures 1-7 This application will be described in further detail to make the technical solution of this application easier to understand and master. Example

[0035] This application discloses a double-blade chassis mechanism.

[0036] Reference Figures 1-6This embodiment of a ride-on lawnmower and its dual-blade chassis mechanism includes a blade disc 1 and two cutting blade assemblies 2. Each cutting blade assembly 2 includes a mounting base 21, a rotating shaft 22, blades 23, a locking element 3, and a rotation limiting element 4. The blade disc 1 has two mounting slots 11. The mounting base 21 is detachably fixed to the blade disc 1 by screws, and the two mounting bases 21 are respectively located within the two mounting slots 11. The rotating shaft 22 is rotatably connected to the mounting base 21 along the vertical axis via a bearing 24. The locking element 3 is used to lock the rotating shaft 22 and the blades 23. The rotation limiting element 4 includes a fixing block 41, a insertion rod 42, and an adjusting rod 43. The outer wall of the mounting base 21 has several recessed grooves 211 formed sequentially along the circumference. The fixing block 41 is detachably connected to the recessed grooves 211.

[0037] Reference Figures 4-6 The adjusting rod 43 is coaxially fixed to one end of the insert rod 42. A threaded hole 412 is provided through the fixing block 41. The adjusting rod 43 has threads and is threadedly connected to the threaded hole 412. The end of the adjusting rod 43 extends out of the threaded hole 412 and has a cross groove 431. The mounting base 21 has a movable groove 212 for the insert rod 42 to enter. The rotating shaft 22 has at least one slot 221 that matches the end of the insert rod 42. An adjustment gap 44 is left between the fixing block 41 and the bottom wall of the inner groove 211. The insert rod 42 is located on the side of the fixing block 41 facing the adjustment gap 44. The insert rod 42 is always inserted into the movable groove 212.

[0038] Reference Figures 3-6 When it is necessary to replace one of the blades 23, the adjusting rod 43 can be rotated through the cross groove 431 to move the insert rod 42 and insert it into the slot 221 of the rotating shaft 22. The engagement of the insert rod 42 and the slot 221 restricts the rotation of the rotating shaft 22. At this time, even if the two blades 23 were originally connected by a linkage mechanism, the rotating shaft 22 with its rotation restricted will not drive the other blade 23 to rotate. The operator only needs to focus on the disassembly of the current blade 23 and does not need to be wary of the linkage rotation of the other blade 23, reducing safety hazards and improving safety when replacing the blade 23. At the same time, the fixing block 41 is detachably connected to the inner groove 211, which facilitates the installation or removal of the rotation restriction component 4 as needed.

[0039] Reference Figure 4 The two ends of the fixing block 41 are respectively formed with mounting wing pieces 411 parallel to the inner walls of the inner groove 211, and the mounting wing pieces 411 are fixed to the mounting base 21 by screws.

[0040] Reference Figure 4The mounting wing 411 is parallel to the inner walls on both sides of the inner groove 211, increasing the contact area between the fixing block 41 and the mounting base 21, making the fixing block 41 more securely fixed on the mounting base 21. The screw connection method is simple to operate, facilitates the installation and removal of the fixing block 41, ensures that the rotation limiter 4 is not easy to loosen during use, and improves the reliability of the overall structure.

[0041] Reference Figures 4-6 The diameter of the insertion rod 42 is larger than the diameter of the adjusting rod 43. When the adjusting rod 43 is rotated to the point where the end of the insertion rod 42 away from the rotating shaft 22 abuts against the fixing block 41, the end of the insertion rod 42 is positioned away from the slot 221.

[0042] Reference Figures 4-6 The diameter of the insertion rod 42 is larger than that of the adjusting rod 43. When the adjusting rod 43 rotates to the point where the end of the insertion rod 42 away from the rotating shaft 22 abuts against the fixing block 41, the end of the insertion rod 42 is away from the slot 221. At this time, the state of the insertion rod 42 is stable, and the rotation limiter 4 does not restrict the rotating shaft 22, and does not affect the normal operation of the cutting blade assembly 2.

[0043] Reference Figures 4-6 An annular groove 421 is coaxially formed on the end face of the insertion rod 42 facing the adjusting rod 43. A spring 45 is provided in the annular groove 421. The two ends of the spring 45 are respectively pressed against the bottom wall of the annular groove 421 and the fixing block 41. The thread on the adjusting rod 43 is located at the end of the adjusting rod 43 close to the insertion rod 42. When the adjusting rod 43 rotates until the thread disengages from the threaded hole 412, the spring 45 drives the insertion rod 42 to always move toward the side of the rotating shaft 22.

[0044] Reference Figures 4-6 The spring 45 is designed so that when the adjusting rod 43 rotates to the point where the thread disengages from the threaded hole 412, the spring 45 can automatically drive the insert rod 42 to always move toward the rotating shaft 22. Then the operator rotates the blade so that the slot 221 is aligned with the movable slot 212, and the end of the insert rod 42 can automatically insert into the slot 221, which improves the convenience of the limited rotation operation.

[0045] Reference Figures 4-6 A force-applying ring 46 is coaxially fixed on the outer wall of the insertion rod 42, and the force-applying ring 46 is always located within the adjustment gap 44.

[0046] Reference Figures 4-6 The force ring 46 provides a convenient force application point for the operator. When it is necessary to adjust the insertion rod 42 away from the slot 221, the force ring needs to be manually turned to move the insertion rod 42 away from the slot 221, and then the adjusting rod 43 is rotated again to make the adjusting rod 43 threaded onto the fixing block 41.

[0047] Reference Figure 4The locking component 3 includes a nut 31 and a screw 32. The screw 32 is integrally formed at the bottom end of the rotating shaft 22. The screw 32 extends out of the mounting base 21. The top end of the screw 32 has a spline 33. The blade 23 has a keyway 231 in the middle that matches the spline 33. The nut 31 is threaded onto the screw 32 and abuts against the blade 23.

[0048] Reference Figure 4 The screw 32 and nut 31 work together to enable quick locking and disassembly of the blade 23 and the shaft 22. The spline 33 and keyway 231 work together to ensure that the blade 23 rotates synchronously with the shaft 22, improving cutting efficiency. This locking method has a simple structure and a stable connection, making it easy for operators to quickly replace the blade 23, while ensuring the stability of the blade 23 during operation.

[0049] Reference Figure 3 and Figure 4 The blade 23 is arranged in a straight line, and both ends of the blade 23 are bent upwards to form a cutting part 232 with a notch 233.

[0050] Reference Figure 3 and Figure 4 This increases the contact area and cutting force between the blade 23 and the grass, enabling more efficient weed cutting. The bent structure design also reduces grass clippings from tangling during the cutting process, improving the mowing effect and the lifespan of the blade 23.

[0051] Reference Figures 1-3 Two auxiliary wheels 12 are mounted on the front end of the cutter head 1. The auxiliary wheels 12 can help the lawnmower maintain balance. On lawns with slight slopes or potholes, the auxiliary wheels 12 can provide support and make the lawnmower more stable. Example

[0052] This application discloses a ride-on lawnmower, such as... Figure 7 As shown, it includes a double-blade chassis mechanism.

[0053] Of course, the above are just typical examples of this application. In addition, this application may have many other specific implementation methods. All technical solutions formed by equivalent substitution or equivalent transformation fall within the scope of protection claimed in this application.

Claims

1. A double-blade chassis mechanism, characterized in that: The device includes a cutter head (1) and two cutting blade assemblies (2). Each cutting blade assembly (2) includes a mounting base (21), a rotating shaft (22), a blade (23), a locking element (3), and a rotation limiting element (4). The cutter head (1) has two mounting slots (11). The mounting base (21) is detachably fixed on the cutter head (1). The two mounting bases (21) are located in the two mounting slots (11) respectively. The rotating shaft (22) is rotatably connected to the mounting base (21) along the vertical axis. The locking element (3) is used to lock the rotating shaft (22) and the blade (23). The rotation limiting element (4) includes a fixing block (41), a plug rod (42), and an adjusting rod (43). The outer wall of the mounting base (21) is sequentially recessed inward along the circumferential direction to form several inner grooves (211). The fixing block (41) is detachably connected to the inner grooves (211). The adjusting rod (43) is coaxially fixed to one end of the insert rod (42). The fixing block (41) has a threaded hole (412) through it. The adjusting rod (43) has a thread and is threaded to the threaded hole (412). The end of the adjusting rod (43) extends out of the threaded hole (412) and has a cross groove (431). The mounting base (21) has a movable groove (212) for the insert rod (42) to enter. The rotating shaft (22) has at least one slot (221) that matches the end of the insert rod (42). An adjustment gap (44) is left between the fixing block (41) and the bottom wall of the inner groove (211). The insert rod (42) is located on the side of the fixing block (41) facing the adjustment gap (44). The insert rod (42) is always inserted into the movable groove (212).

2. The double-blade chassis mechanism according to claim 1, characterized in that: The fixing block (41) has mounting winglets (411) at both ends that are parallel to the inner walls of the inner groove (211), and the mounting winglets (411) are fixed to the mounting base (21) by screws.

3. The double-blade chassis mechanism according to claim 1, characterized in that: The diameter of the insertion rod (42) is larger than the diameter of the adjusting rod (43). When the adjusting rod (43) is rotated to the point where the end of the insertion rod (42) away from the rotating shaft (22) abuts against the fixing block (41), the end of the insertion rod (42) is positioned away from the slot (221).

4. The double-blade chassis mechanism according to claim 3, characterized in that: The insertion rod (42) has a coaxial annular groove (421) on one end face facing the adjusting rod (43). A spring (45) is provided in the annular groove (421). The two ends of the spring (45) are respectively pressed against the bottom wall of the annular groove (421) and the fixing block (41). The thread on the adjusting rod (43) is located at the end of the adjusting rod (43) close to the insertion rod (42). When the adjusting rod (43) rotates until the thread disengages from the threaded hole (412), the spring (45) drives the insertion rod (42) to always move toward the rotating shaft (22).

5. A double-blade chassis mechanism according to claim 4, characterized in that: A force-applying ring (46) is coaxially fixed on the outer wall of the insertion rod (42), and the force-applying ring (46) is always located within the adjustment gap (44).

6. The double-blade chassis mechanism according to claim 1, characterized in that: The locking component (3) includes a nut (31) and a screw (32). The screw (32) is integrally formed on the bottom end of the rotating shaft (22). The screw (32) extends out of the mounting base (21). The top end of the screw (32) has a spline (33). The blade (23) has a keyway (231) in the middle that matches the spline (33). The nut (31) is threaded onto the screw (32) and abuts against the blade (23).

7. The double-blade chassis mechanism according to claim 1, characterized in that: The blade (23) is arranged in a straight line, and the two ends of the blade (23) are bent upwards to form a cutting part (232) with a notch (233).

8. A ride-on lawnmower, characterized in that: The double-blade chassis mechanism described in any one of claims 1-7 is applied.

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