Rolling protection for a grass cutting head of a lawnmower

Abstract

The utility model discloses a lawn mower grass head rolling protection device relates to garden tool technical field. The device includes device ontology, isolation board, upper fixed pressure ring, bearing, lower fixed pressure ring and locking piece, and device ontology is the structure of gyration body, and the outer surface is spheric surface, and isolation board sets up between the body and grass head blade, and bearing is embedded in the center hole of device ontology, and its outer ring is fixed with device ontology, and upper fixed pressure ring, lower fixed pressure ring respectively from the upper and lower of bearing abut the inner race and outer race end face of bearing, and locking piece fixes the above-mentioned spare part in grass head drive shaft. The device realizes the free rolling of device ontology through bearing, and makes grass head automatically adapt to the fluctuation of ground, reduces manual operation strength, avoids blade contact ground or stone, and significantly improves the operation safety and efficiency.

Description

Technical Field

[0001] This utility model relates to the field of garden tool technology, and in particular to a rolling protection device for the mower head. Background Technology

[0002] Current lawnmowers require users to manually control the distance between the mowing head and the ground during operation, which can easily lead to fatigue over time. Furthermore, the blades are directly exposed, making them susceptible to contact with ground protrusions or stones, causing blade wear, breakage, and even safety accidents. Although some lawnmowers are equipped with protective covers, these do not solve the problems of height control and dynamic cushioning. Summary of the Invention

[0003] The purpose of this utility model is to solve the shortcomings of the above-mentioned problems and provide a lawnmower head rolling protection device that allows for effortless operation of the cutting head and protects the blades during lawnmower use.

[0004] The technical solution to the problem that this utility model aims to solve is as follows: A rolling protection device for a lawnmower head, characterized in that it includes an isolation plate installed on the drive shaft of the lawnmower head with blades mounted on it, an upper fixing ring, a bearing, a device body outside the bearing, a lower fixing ring below the bearing, and a locking member fitted onto the end of the drive shaft. The device body has a rotating structure with a spherical outer surface. The bearing is installed in the central hole of the device body. The upper surface of the upper fixing ring abuts against the isolation plate and the lower surface presses against the bearing. The upper surface of the lower fixing ring presses against the bearing and the lower surface abuts against the locking member.

[0005] Preferably, the outer surface of the device body is a sphere or an ellipsoid.

[0006] Preferably, the bearing is a deep groove ball bearing, and its outer ring is interference-fitted with the center hole of the device body.

[0007] Preferably, the upper fixing ring includes an upper flange end and a lower cylindrical end, wherein the outer diameter of the upper flange end is greater than the inner ring diameter of the bearing and less than or equal to the outer ring diameter of the bearing.

[0008] Preferably, the lower fixing ring includes an upper cylindrical end and a lower flange end, wherein the outer diameter of the lower flange end is greater than the inner ring diameter of the bearing and less than or equal to the outer ring diameter of the bearing.

[0009] Preferably, the locking element is a hexagonal nut, and the end of the drive shaft is provided with an external thread that mates with the hexagonal nut.

[0010] The beneficial effects of this utility model are as follows: Compared with existing technologies, the rolling structure of the device body allows the mowing head to adapt to the undulations of the ground, reducing the intensity of manual height control and making manual operation more labor-saving; in addition, the rolling friction resistance of the device body is small during operation, which can increase the mowing speed and shorten the operation time.

[0011] In addition, the isolation plate works in conjunction with the device body to ensure that the blades always maintain a safe distance from the ground, avoiding collision damage and improving the safety of the grass cutting head. Attached Figure Description

[0012] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0013] Figure 1 This is a schematic diagram of the overall device of this utility model; Figure 2 This is an exploded view of the structure of this utility model; Figure 3 This is a partial cross-sectional structural diagram of the present invention. Detailed Implementation

[0014] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are provided solely for the purpose of clearly illustrating the technical solution of the present invention, offering numerous specific details to provide a more thorough understanding. However, those skilled in the art will recognize that the present invention can be implemented without one or more of these details. In these examples, to avoid confusion with the present invention, some technical features known in the art have not been described.

[0015] It should be understood that the present invention can be implemented in different forms and should not be construed as being limited to the embodiments set forth herein. Therefore, these embodiments are merely examples and should not be used to limit the scope of protection of the present invention.

[0016] Additionally, it should be noted that, unless otherwise stated, the technical or scientific terms used in this application shall have the ordinary meaning as understood by one of ordinary skill in the art to which this utility model pertains.

[0017] See Figures 1 to 3A lawnmower head rolling protection device includes an isolation plate 4 mounted on the drive shaft 6 of the lawnmower head A (with blade B mounted on it), an upper fixing ring 2, a bearing 3, a device body 1 outside the bearing 3, a lower fixing ring 2' below the bearing 4, and a locking member 5 fitted onto the end of the drive shaft; the isolation plate 4 has a through hole in its center for the lawnmower head drive shaft 6 to pass through. The device body 1 can be injection molded from nylon material.

[0018] The device body 1 has a rotating structure with a spherical outer surface. A central platform with a central hole is provided at the center of the device body 1. The bottom surface of the device body 1 converges at the periphery of the central platform, which is lower than the top of the outer surface. The bearing 4 is installed in the central hole of the device body 1. The upper surface of the upper fixing ring 2 abuts against the isolation plate 4, and the lower surface presses against the bearing 3. The upper surface of the lower fixing ring 2' presses against the bearing 3, and the lower surface abuts against the locking member 5. The upper fixing ring 2 and the lower fixing ring 2' are symmetrically arranged with respect to the bearing 3 to clamp the bearing 3. The locking member 5 rotates on the thread at the end of the drive shaft 6 to press the lower fixing ring 2' against the bearing 3. The upper fixing ring 2 is then fixed above the bearing. The upper fixing ring 2 presses against the blade B through the isolation plate 4. When the blade B rotates with the drive shaft 6 to cut weeds, the device body 1 becomes independent through the bearing 4.

[0019] During assembly, the partition plate 4 and the upper fixing ring 2 are sequentially fitted onto the drive shaft 6 below the blade B. Then, the assembly piece of the device body 1, with the bearing 3 already pressed into the center hole of the device body 1, is fitted onto the drive shaft 6. Next, the lower fixing ring 2' is fitted onto the drive shaft 6. Finally, the locking piece 5 is fitted onto the drive shaft 6 and tightened. The tightening process creates a rigid, resistive clamping effect between the components. During operation, when the mowing head contacts the ground, the device body 1 rolls along the ground as the user presses the mowing head directly against the ground and moves the mower handle. The device body 1 maintains a fixed distance from the blade via the partition plate 4, preventing the blade B from directly contacting the ground or rocks.

[0020] Furthermore, as an improvement to this utility model, the outer surface of the device body 1 is a spherical or ellipsoidal surface.

[0021] Furthermore, as an improvement to this utility model, the bearing 4 is a deep groove ball bearing, and its outer ring is interference-fitted with the center hole of the device body 1.

[0022] In this embodiment, the interference fit allows the bearing 4 to operate as a single unit with the device body 1.

[0023] Furthermore, as an improvement to this utility model, the upper fixing ring 2 includes an upper flange end and a lower cylindrical end, wherein the outer diameter of the upper flange end is greater than the inner ring diameter of the bearing and less than or equal to the outer ring diameter of the bearing.

[0024] In this embodiment, the upper flange end prevents the bearing 4 from being affected by external factors, while the lower cylindrical end isolates the interior of the bearing 3 from the drive shaft 6, thus protecting the bearing.

[0025] Furthermore, as an improvement to this utility model, the lower fixing pressure ring includes an upper cylindrical end and a lower flange end, wherein the outer diameter of the lower flange end is greater than the inner ring diameter of the bearing and less than or equal to the outer ring diameter of the bearing.

[0026] In this embodiment, the lower flange end prevents the bearing 4 from being affected by external factors, while the upper cylindrical end protects the bearing 3 from external influences and the drive shaft 6.

[0027] Furthermore, as an improvement to this utility model, the locking member 5 is a hexagonal nut, and the end of the drive shaft 6 is provided with an external thread that mates with the hexagonal nut.

[0028] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model, and they should all be covered within the scope of the claims and specification of this utility model.

Claims

1. A rolling protection device for the mower head, characterized in that: Includes an isolation plate mounted on the drive shaft of the grass trimmer head with the blades mounted on it, an upper fixing ring, a bearing, a device body outside the bearing, a lower fixing ring below the bearing, and a locking component fitted onto the end of the drive shaft. The device body has a rotating structure with a spherical outer surface. The bearing is installed in the central hole of the device body. The upper surface of the upper fixing ring abuts against the isolation plate and the lower surface presses against the bearing. The upper surface of the lower fixing ring presses against the bearing and the lower surface abuts against the locking member.

2. The lawnmower head rolling protection device according to claim 1, characterized in that: The outer surface of the device body is a sphere or an ellipsoid.

3. The lawnmower head rolling protection device according to claim 1, characterized in that: The bearing is a deep groove ball bearing, and its outer ring is interference-fitted with the center hole of the device body.

4. The lawnmower head rolling protection device according to claim 1, characterized in that: The upper fixed pressure ring includes an upper flange end and a lower cylindrical end, wherein the outer diameter of the upper flange end is greater than the inner ring diameter of the bearing and less than or equal to the outer ring diameter of the bearing.

5. The lawnmower head rolling protection device according to claim 1, characterized in that: The lower fixed pressure ring includes an upper cylindrical end and a lower flange end, wherein the outer diameter of the lower flange end is greater than the inner ring diameter of the bearing and less than or equal to the outer ring diameter of the bearing.

6. The lawnmower head rolling protection device according to claim 1, characterized in that: The locking element is a hexagonal nut, and the end of the drive shaft is provided with an external thread that mates with the hexagonal nut.

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