Double-layer blade group for mowing machine

Abstract

The utility model discloses a double-layer blade group for a mower. The double-layer blade group comprises a blade seat, a bottom cover plate, a blade positioning structure and four mower blades, according to the double-layer blade set for the mower, the mower blades can be protected in a swing type installation mode of the mower blades, when the mower blades are subjected to rigid resistance in the rotation process, the mower blades swing relative to the installation unit to remove part of impact, and a certain anti-breakage protection effect is achieved on the mower blades; the mounting unit extends out of the blade seat, so that the mower blade can be replaced conveniently; the bottom cover plate is used for achieving the rotation limiting effect on the positioning bolt, and the positioning bolt is prevented from loosening in the rotating process.

Description

Technical Field

[0001] This utility model relates to a blade assembly, and more particularly to a double-layer blade assembly for a lawnmower. Background Technology

[0002] A lawnmower, also known as a lawn trimmer, is a mechanical tool used for cutting lawns and vegetation. With social and economic development and increasing environmental awareness, lawns and grasslands have become increasingly prevalent in our lives, leading to the widespread use of lawnmowers. Existing lawnmower blades typically have a single-layer structure, thus only providing basic weed-cutting functionality, and most lawnmower blades lack protective structures. Utility Model Content

[0003] Purpose of the utility model: To provide a double-layer blade assembly for a lawnmower that can provide some protection for the blades.

[0004] Technical Solution: This utility model provides a double-layer blade assembly for a lawnmower, comprising a blade holder, a bottom cover plate, a blade positioning structure, and four lawnmower blades. The blade positioning structure includes a positioning bolt and two blade positioning seats. Both blade positioning seats are located inside the blade holder. The end of the positioning bolt passes through the middle of the two blade positioning seats and is threaded onto the inner top surface of the blade holder. Two mounting units extending out of the blade holder are provided on each of the two blade positioning seats. The four lawnmower blades are elastically oscillatingly mounted on the four mounting units. A bottom window is provided at the bottom of the blade holder. The bottom cover plate is detachably mounted on the bolt head of the positioning bolt for embedding and covering the bottom window. A follower seat for mounting on the output shaft of the lawnmower is provided at the top of the blade holder.

[0005] Furthermore, an internal hexagonal tube for inserting the bolt head of the positioning bolt is rotatably installed on the bottom cover plate; an annular groove is provided on the bolt head of the positioning bolt; multiple locking tubes are fixedly connected to the internal hexagonal tube; a locking pin is inserted into each locking tube at one end for extending into the internal hexagonal tube; the extended end of the locking pin is hemispherical for snapping into the annular groove; a locking spring is elastically supported between the other end of the locking pin and the bottom of the locking tube; and a disassembly slot is provided on one side edge of the bottom cover plate.

[0006] Furthermore, two arc-shaped holes are provided on the bottom cover plate; two limiting protrusions, which pass through the two arc-shaped holes respectively, are fixed on the internal hexagonal tube.

[0007] Furthermore, each of the two blade positioning seats is provided with an insertion slot and an insertion protrusion inserted into the insertion slot.

[0008] Furthermore, the mounting unit includes a flat tube and a rotating sleeve; blade windows are provided on all four vertical sides of the blade holder; the blade windows on two opposite sides form a group, and the two blade windows in the same group are positioned correspondingly; the two groups of blade windows are located on the upper and lower sides of the blade holder respectively; one end of the flat tube is fixed to the blade positioning seat, and the other end extends through the blade window; the lawnmower blade is oscillatingly mounted on the extended end of the flat tube; a reset rod is provided on the end of the lawnmower blade; a reset spring supported on the reset rod is provided inside the flat tube.

[0009] Compared with the prior art, the advantages of this utility model are as follows: the swing-type installation method of the lawnmower blade can protect the lawnmower blade. When the lawnmower blade is subjected to rigid resistance during rotation, it swings relative to the installation unit to dissipate part of the impact, which can play a certain role in preventing the lawnmower blade from breaking; the extension of the blade holder by the installation unit makes it easy to replace the lawnmower blade; the bottom cover plate plays a role in limiting the rotation of the positioning bolt, preventing the positioning bolt from loosening during rotation. Attached Figure Description

[0010] Figure 1 This is the front view of the present invention;

[0011] Figure 2 This is a bottom view of the blade holder of this utility model;

[0012] Figure 3 This is a right view of the blade holder of this utility model;

[0013] Figure 4 This is a cross-sectional view of the blade mounting structure of this utility model;

[0014] Figure 5 This is a schematic diagram of the installation of the lawnmower blade of this utility model;

[0015] Figure 6 This is a cross-sectional view of the bottom cover plate of this utility model;

[0016] In the diagram: 1. Follower seat; 2. Follower bolt; 3. Blade holder; 4. Blade window; 5. Blade positioning seat; 6. Insertion protrusion; 7. Insertion slot; 8. Flat tube; 9. Return spring; 10. Clamping slot; 11. Mounting bolt; 12. Rotating sleeve; 13. Lawn mower blade; 14. Bottom cover plate; 15. Positioning bolt; 16. Hexagonal socket tube; 17. Locking tube; 18. Annular groove; 19. Locking post; 20. Locking spring; 21. Limiting protrusion; 22. Arc-shaped hole; 23. Disassembly slot; 24. Bottom window. Detailed Implementation

[0017] The technical solution of this utility model will be described in detail below with reference to the accompanying drawings, but the protection scope of this utility model is not limited to the described embodiments.

[0018] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0019] In the description of this utility model, it should be understood that the terms "left", "right", "front", "back", "up", "down", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the purpose of simplifying the description of this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0020] Example 1:

[0021] like Figure 1-6 As shown, the present invention provides a double-layer blade assembly for a lawnmower, comprising: a blade holder 3, a bottom cover plate 14, a blade positioning structure, and four lawnmower blades 13; the blade positioning structure includes a positioning bolt 15 and two blade positioning seats 5;

[0022] Two blade positioning seats 5 are located on the upper and lower sides of the blade holder 3, respectively; the end of the positioning bolt 15 passes through the middle of the two blade positioning seats 5 and is threaded onto the inner top surface of the blade holder 3; two mounting units extending out of the blade holder 3 are provided on each of the two blade positioning seats 5; four lawnmower blades 13 are elastically oscillatingly mounted on the four mounting units; the blades of the lawnmower blades 13 are serrated; a bottom window 24 is provided at the bottom of the blade holder 3; a bottom cover plate 14 is detachably mounted on the bolt head of the positioning bolt 15 for embedding and covering the bottom window 24; a follower seat 1 for inserting the lawnmower output shaft is provided at the top of the blade holder 3; a follower bolt 2 for passing through the lawnmower output shaft is threaded onto the follower seat 1.

[0023] The swing-type mounting method of the lawnmower blade 13 can protect the lawnmower blade 13. When the lawnmower blade 13 is subjected to rigid resistance during rotation, it swings relative to the mounting unit to dissipate part of the impact, which can play a certain role in preventing the lawnmower blade 13 from breaking. The blade holder 3 extended by the mounting unit makes it easy to replace the lawnmower blade 13. The bottom cover plate 14 plays a role in limiting the rotation of the positioning bolt 15, preventing the positioning bolt 15 from loosening during rotation.

[0024] Furthermore, an internal hexagonal tube 16 for inserting the bolt head of the positioning bolt 15 is rotatably mounted on the upper side of the bottom cover plate 14; an annular groove 18 is provided on the bolt head of the positioning bolt 15; multiple locking tubes 17 are fixedly connected to the vertical side wall of the internal hexagonal tube 16; a locking pin 19 is inserted into each locking tube 17, with one end for extending into the internal hexagonal tube 16; the extended end of the locking pin 19 is hemispherical and is used to snap onto the annular groove 18; a limiting groove is provided along the length direction on the inner wall of the locking tube 17; a limiting protrusion is provided on the locking pin 19 that slides with the limiting groove; a locking spring 20 is elastically supported between the other end of the locking pin 19 and the bottom of the locking tube 17; and a disassembly slot 23 is provided on one side edge of the bottom cover plate 14.

[0025] The locking spring 20 drives the hemispherical end of the locking pin 19 to extend into the internal hexagonal tube 16 and then snap onto the annular groove 18. The hemispherical end of the locking pin 19 makes it easy to install and remove the bottom cover plate 14.

[0026] Furthermore, two arc-shaped holes 22 are provided on the bottom cover plate 14; two limiting protrusions 21, respectively penetrating the two arc-shaped holes 22, are fixed on the internal hexagonal tube 16. The engagement between the arc-shaped holes 22 and the limiting protrusions 21 allows the internal hexagonal tube 16 to rotate slightly, enabling the bolt head of the positioning bolt 15 to be inserted into the internal hexagonal tube 16. The engagement between the bottom cover plate 14 and the bottom window 24, as well as the engagement between the internal hexagonal tube 16 and the bolt head of the positioning bolt 15, effectively limits the rotation of the positioning bolt 15, preventing it from loosening.

[0027] Furthermore, an insertion slot 7 is provided on one blade positioning seat 5, and an insertion protrusion 6 is provided on the other blade positioning seat 5 that is inserted into the insertion slot 7.

[0028] Furthermore, the mounting unit includes a flat tube 8 and a rotating sleeve 12; blade windows 4 are provided on all four vertical sides of the blade holder 3; the blade windows 4 on two opposite sides form a group, and the two blade windows 4 in the same group are positioned correspondingly; the two groups of blade windows 4 are located on the upper and lower sides of the blade holder 3 respectively; one end of the flat tube 8 is fixed to the blade positioning seat 5, and the other end extends through the blade window 4; a clamping slot 10 is horizontally provided on the extended end of the flat tube 8; the mounting end of the lawnmower blade 13 extends into the clamping slot 10, and a rotating sleeve 12 is provided through the mounting end of the lawnmower blade 13; a rotating mounting bolt 11 is installed through the extended end of the flat tube 8, and a mounting nut is threaded onto the through end of the mounting bolt 11; a reset rod 25 is provided on the end of the lawnmower blade 13; and a reset spring 9 supported on the reset rod 25 is provided on both vertical inner walls of the flat tube 8.

[0029] The return spring 9 is pressed on the return rod 25 to provide elastic support for the lawnmower blade 13, so that the lawnmower blade 13 will not swing when cutting soft objects such as grass stems, and will swing relative to the flat tube 8 when subjected to rigid resistance; the rotating sleeve 12 is used to prevent the mounting bolt 11 from loosening due to friction from the lawnmower blade 13.

[0030] As described above, although the present invention has been shown and described with reference to specific preferred embodiments, it should not be construed as limiting the present invention itself. Various changes in form and detail may be made to the present invention without departing from the spirit and scope of the appended claims.

Claims

1. A double-layer blade assembly for a lawnmower, characterized in that: The device includes a blade holder (3), a bottom cover (14), a blade positioning structure, and four lawnmower blades (13). The blade positioning structure includes a positioning bolt (15) and two blade positioning seats (5). Both blade positioning seats (5) are located inside the blade holder (3). The end of the positioning bolt (15) passes through the middle of the two blade positioning seats (5) and is threaded onto the inner top surface of the blade holder (3). Two mounting units extending out of the blade holder (3) are provided on each of the two blade positioning seats (5). The four lawnmower blades (13) are elastically oscillatingly mounted on the four mounting units. A bottom window (24) is provided at the bottom of the blade holder (3). The bottom cover (14) is detachably mounted on the bolt head of the positioning bolt (15) for embedding and covering the bottom window (24). A follower seat (1) for mounting on the output shaft of the lawnmower is provided at the top of the blade holder (3).

2. The double-layer blade assembly for a lawnmower according to claim 1, characterized in that: An internal hexagonal tube (16) for inserting the bolt head of the positioning bolt (15) is rotatably mounted on the bottom cover plate (14); an annular groove (18) is provided on the bolt head of the positioning bolt (15); multiple locking tubes (17) are fixedly connected to the internal hexagonal tube (16); a locking pin (19) is inserted into each locking tube (17) at one end for extending into the internal hexagonal tube (16); the extended end of the locking pin (19) is hemispherical and is used to snap onto the annular groove (18); a locking spring (20) is elastically supported between the other end of the locking pin (19) and the bottom of the locking tube (17); a disassembly slot (23) is provided on one side edge of the bottom cover plate (14).

3. The double-layer blade assembly for a lawnmower according to claim 1, characterized in that: Two arc-shaped holes (22) are provided on the bottom cover plate (14); two limiting protrusions (21) that pass through the two arc-shaped holes (22) are fixed on the internal hexagonal tube (16).

4. The double-layer blade assembly for a lawnmower according to claim 1, characterized in that: Two blade positioning seats (5) are respectively provided with insertion slots (7) and insertion protrusions (6) inserted into the insertion slots (7).

5. The double-layer blade assembly for a lawnmower according to claim 1, characterized in that: The mounting unit includes a flat tube (8) and a rotating sleeve (12); blade windows (4) are provided on the four vertical sides of the blade holder (3); the blade windows (4) on two opposite sides are a group, and the two blade windows (4) in the same group are in corresponding positions; the two groups of blade windows (4) are located on the upper and lower sides of the blade holder (3) respectively; one end of the flat tube (8) is fixed on the blade positioning seat (5), and the other end extends through the blade window (4); the lawnmower blade (13) is oscillatingly mounted on the extended end of the flat tube (8); a reset rod (25) is provided on the end of the lawnmower blade (13); a reset spring (9) supported on the reset rod (25) is provided inside the flat tube (8).

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