Handle and mower

Abstract

The invention provides a handle and a mower. The handle comprises an upper rod assembly, a lower rod assembly and a locking assembly. The upper rod assembly has an extending state and a retracting state, and in the extending state, the upper rod assembly can extend to a first position relative to the lower rod assembly; in the retracting state, the upper rod assembly can retract to a second position relative to the lower rod assembly; the locking assembly has a release state and a locking state, and in the release state, the upper rod assembly can slide relative to the lower rod assembly; in the locking state, the upper rod assembly and the lower rod assembly can be locked at the first position. The locking assembly comprises a locking element, a sensing element and a triggering element, the sensing element and the triggering element are fixed on the locking element, and when and only when the upper rod assembly extends to a first position relative to the lower rod assembly and the locking element locks the upper rod assembly and the lower rod assembly at the first position, the sensing element and the triggering element are mutually sensed and conducted.

Description

Technical Field

[0001] The invention relates to a handle and a lawn mower, belonging to the technical field of garden tools. Background Art

[0002] A lawn mower is a tool used to trim the lawn. It mainly uses the motor in the main body to drive the blade to rotate, and then cut the overlong grass leaves. In order to achieve efficient mowing, the motor power of the lawn mower is usually set to be relatively large, which also poses certain risks to the personal safety of the operator.

[0003] The current solution is to use a long handlebar to keep the operator as far away from the main body as possible to avoid danger. However, in order to facilitate the storage of the lawn mower, the handlebar is often divided into two retractable sections, which may cause the user's hands to be close to the main body due to accidental retraction during operation, resulting in danger.

[0004] In view of this, it is necessary to propose improvements to the existing lawn mower to solve the above problems. Summary of the invention

[0005] The object of the present invention is to provide a handle and a lawn mower using the handle, wherein the handle can be shut off in time when an upper rod assembly is accidentally retracted, so as to avoid danger.

[0006] To achieve the above object, the present invention provides a handle, comprising:

[0007] Lower rod assembly;

[0008] an upper rod assembly, the upper rod assembly being able to slide relative to the lower rod assembly, the upper rod assembly having an extended state and a retracted state, in which the upper rod assembly can extend outwardly to a first position relative to the lower rod assembly; in the retracted state, the upper rod assembly can retract inwardly to a second position relative to the lower rod assembly; and

[0009] A locking assembly, wherein the locking assembly can lock the upper rod assembly and the lower rod assembly, and the locking assembly has a released state and a locked state. In the released state, the upper rod assembly can slide relative to the lower rod assembly; in the locked state, the upper rod assembly and the lower rod assembly can be locked with each other at a first position;

[0010] Wherein, the locking assembly includes a locking element and a sensing element and a triggering element fixed on the locking element, and the sensing element is arranged opposite to the triggering element; when and only when the upper rod assembly is extended to the first position relative to the lower rod assembly, and the locking element locks the upper rod assembly and the lower rod assembly at the first position, the sensing element and the triggering element sense each other and conduct.

[0011] As a further improvement of the present invention, two first through holes arranged opposite to each other are provided at a position on the lower rod assembly connected to the upper rod assembly, and two second through holes arranged opposite to each other are provided at the first position of the upper rod assembly to align with the two first through holes, and when the locking element locks the upper rod assembly and the lower rod assembly at the first position, the sensing element aligns with one of the first through hole and the second through hole, and the trigger element aligns with the other first through hole and the second through hole.

[0012] As a further improvement of the present invention, in the locked state, the upper rod assembly and the lower rod assembly can also be locked with each other at the second position; the upper rod assembly is provided with a third through hole at the second position, and the third through hole is provided with one to align with one of the first through holes, and when the locking element locks the upper rod assembly and the lower rod assembly at the second position, the trigger element is aligned with the third through hole, and the upper rod assembly separates the sensing element and the trigger element.

[0013] As a further improvement of the present invention, the locking element includes a locking piece fixed on the outer wall of the lower rod assembly and a holding piece rotatably connected to the locking piece, the locking piece is provided with a fourth through hole opposite to one of the first through holes, the holding piece is protruding with a fixing column, and the fixing column is configured to be able to be inserted into the interior of the lower rod assembly from the fourth through hole and the first through hole.

[0014] As a further improvement of the present invention, when the retaining member rotates in a direction away from the locking member and causes the fixing column to disengage from the first through hole and the fourth through hole, the locking assembly is in a released state.

[0015] As a further improvement of the present invention, the trigger element is fixed in the fixing column, and the sensing element is fixed in the locking member and is arranged in alignment with another first through hole.

[0016] As a further improvement of the present invention, the locking member includes a first locking member and a second locking member assembled and matched with each other, the retaining member is rotatably connected to the first locking member, the fourth through hole is opened on the first locking member, and the sensing element is fixed in the second locking member.

[0017] As a further improvement of the present invention, a rotating shaft is fixed to one end of the first locking member, and one end of the holding member is sleeved on the rotating shaft, so that the holding member can rotate around the rotating shaft.

[0018] As a further improvement of the present invention, the sensing element and the triggering element are both photoelectric sensing devices. When the first through hole and the second through hole are aligned with each other, the sensing element and the triggering element can sense each other and conduct; when the first through hole and the third through hole are aligned with each other, the sensing element and the triggering element are separated by the upper rod assembly, and the sensing fails.

[0019] As a further improvement of the present invention, a blocking structure is provided inside the upper rod assembly at the second position to separate the third through hole from the inner cavity of the upper rod assembly.

[0020] As a further improvement of the present invention, the sensing element and the triggering element are both Hall devices or mechanical switches. When the first through hole and the second through hole are aligned with each other, the sensing element and the triggering element can sense each other and conduct; when the first through hole and the third through hole are aligned with each other, the sensing element and the triggering element are separated by the blocking structure, and the induction fails.

[0021] To achieve the above object, the present invention further provides a lawn mower, comprising a main body and a handle extending upward and backward from the main body, wherein the handle comprises:

[0022] Lower rod assembly;

[0023] an upper rod assembly, the upper rod assembly being able to slide relative to the lower rod assembly, the upper rod assembly having an extended state and a retracted state, in which the upper rod assembly can extend outwardly to a first position relative to the lower rod assembly; in the retracted state, the upper rod assembly can retract inwardly to a second position relative to the lower rod assembly; and

[0024] A locking assembly, wherein the locking assembly can lock the upper rod assembly and the lower rod assembly, and the locking assembly has a released state and a locked state. In the released state, the upper rod assembly can slide relative to the lower rod assembly; in the locked state, the upper rod assembly and the lower rod assembly can be locked with each other at a first position;

[0025] Wherein, the locking assembly includes a locking element and a sensing element and a triggering element fixed on the locking element, and the sensing element is arranged opposite to the triggering element; when and only when the upper rod assembly is extended to the first position relative to the lower rod assembly, and the locking element locks the upper rod assembly and the lower rod assembly at the first position, the sensing element and the triggering element sense each other and conduct, so that the lawn mower can start working.

[0026] The beneficial effect of the present invention is that the handle of the present invention arranges the upper rod assembly and the lower rod assembly so that only when the upper rod assembly is extended to the first position relative to the lower rod assembly and the locking element locks the upper rod assembly and the lower rod assembly at the first position, the sensing element and the triggering element will sense each other and be connected, while in other cases, the sensing element and the triggering element will not generate induction, thereby avoiding the occurrence of dangerous situations and enhancing safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of the lawn mower of the present invention.

[0028] Figure 2 yes Figure 1 Schematic diagram of the structure when the middle handle is in the extended state.

[0029] Figure 3 yes Figure 1 Schematic diagram of the structure when the middle handle is in the retracted state.

[0030] Figure 4 yes Figure 3 Exploded view of handle shown.

[0031] Figure 5 yes Figure 4 Exploded view of the mid-upper bar assembly.

[0032] Figure 6 yes Figure 4 Schematic diagram of the structure of the middle and lower rod assembly.

[0033] Figure 7 yes Figure 4 Schematic diagram of the structure of the locking component.

[0034] Figure 8 yes Figure 7 Exploded view of locking assembly shown.

[0035] Fig. 9 yes Figure 8 Schematic diagram from another angle. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0037] like Figure 1As shown, the present invention discloses a lawn mower 100, including a main body 20 and a handle 10 extending upward and backward from the main body 20, wherein the main body 20 includes a housing assembly 21, a power head assembly 22, a cutter assembly (not numbered) and a self-propelled assembly 23, so as to ensure that the lawn mower 100 can work normally. Since the main improvement of the present invention lies in the handle 10, the handle 10 will be described in detail in the following description, and the specific details of the main body 20 will not be described.

[0038] like Figures 2 to 4 and Fig. 9 As shown, the handle 10 includes a lower rod assembly 12, an upper rod assembly 11 that can slide relative to the lower rod assembly 12, and a locking assembly 13 that can lock the upper rod assembly 11 and the lower rod assembly 12. The upper rod assembly 11 has an extended state and a retracted state. In the extended state (such as Figure 2 ), the upper rod assembly 11 can be extended outward to a first position relative to the lower rod assembly 12; in the retracted state (such as Figure 3 ), the upper rod assembly 11 can be retracted inward to the second position relative to the lower rod assembly 12. The locking assembly 13 has a release state and a locking state. In the release state, the upper rod assembly 11 can slide freely relative to the lower rod assembly 12; in the locking state, the upper rod assembly 11 and the lower rod assembly 12 can be locked with each other at the first position / the second position.

[0039] In this embodiment, the upper rod assembly 11 and the lower rod assembly 12 can be locked at both the first position and the second position; of course, in another embodiment, the upper rod assembly 11 and the lower rod assembly 12 can also be locked only at the first position without limiting the state at the second position.

[0040] The locking assembly 13 includes a locking element 131, a sensing element 132 and a triggering element 133 fixed on the locking element 131, wherein the sensing element 132 and the triggering element 133 are arranged opposite to each other; when and only when the upper rod assembly 11 is extended to the first position relative to the lower rod assembly 12, and the locking element 131 locks the upper rod assembly 11 and the lower rod assembly 12 at the first position, the sensing element 132 and the triggering element 133 sense each other and conduct, so that the lawn mower 100 can be turned on and operated. In other cases, the lawn mower 100 cannot be turned on and operated.

[0041] That is to say, the handle 10 constitutes a safety switch mechanism, and only when the upper rod assembly 11 is in an extended state and the locking element 131 keeps the upper rod assembly 11 and the lower rod assembly 12 in a locked state, the sensing element 132 and the triggering element 133 can sense each other and conduct, and the lawn mower 100 can be turned on normally at this time; in other cases, the lawn mower 100 cannot be turned on normally and remains in the off state.

[0042] like Figure 5 and Figure 6 Combined with Figure 8 and Fig. 9 As shown, the upper rod assembly 11 and the lower rod assembly 12 are both hollow tubular structures, and the outer diameter of the upper rod assembly 11 is slightly smaller than the inner diameter of the lower rod assembly 12, so as to ensure that the upper rod assembly 11 can slide in / out smoothly in the lower rod assembly 12. The lower rod assembly 12 is provided with two first through holes 121, and the two first through holes 121 are arranged opposite to each other and are connected to each other. The upper rod assembly 11 is provided with two second through holes 111, and the two second through holes 111 are also arranged opposite to each other. When the upper rod assembly 11 is located in the first position, the first through hole 121 and the second through hole 111 are aligned with each other. The upper rod assembly 11 is also provided with a third through hole 112, and only one third through hole 112 is provided. When the upper rod assembly 11 is located in the second position, the third through hole 112 is aligned with one of the first through holes 121.

[0043] The first through hole 121, the second through hole 111 and the third through hole 112 are arranged so that when the locking element 131 locks the upper rod assembly 11 and the lower rod assembly 12 at the first position, the sensing element 132 can be aligned with one of the first through hole 121 and the second through hole 111, and the triggering element 133 can be aligned with the other first through hole 121 and the second through hole 111, and at this time the sensing element 132 senses the triggering element 133; and when the locking element 131 locks the upper rod assembly 11 and the lower rod assembly 12 at the second position, the triggering element 133 can be aligned with the third through hole 112, and the sensing element 132 is separated by the upper rod assembly 11, and the sensing element 132 cannot sense the triggering element 133.

[0044] In this embodiment, at the second position, the upper rod assembly 11 is directly used to separate the sensing element 132 and the triggering element 133; of course, a blocking structure 14 can also be added inside the upper rod assembly 11, and the third through hole 112 and the inner cavity of the upper rod assembly 11 can be separated by the blocking structure 14, so that the sensing element 132 cannot sense the triggering element 133.

[0045] like Figures 6 to 9As shown, the locking element 131 includes a locking piece fixed on the outer wall of the lower rod assembly 12 and a retaining piece 135 rotatably connected to the locking piece, the locking piece is provided with a fourth through hole 134 corresponding to one of the first through holes 121, and the retaining piece 135 is protrudingly provided with a fixing column 1351, and the fixing column 1351 is configured to be able to be inserted into the interior of the lower rod assembly 12 from the fourth through hole 134 and the first through hole 121.

[0046] When the buckle 135 rotates in a direction away from the locking member and causes the fixing column 1351 to be separated from the first through hole 121 and the fourth through hole 134, the locking assembly 13 is in a released state, and the upper rod assembly 11 can be freely extended and retracted relative to the lower rod assembly 12. When the buckle 135 rotates in a direction close to the locking member and causes the fixing column 1351 to be inserted from the fourth through hole 134 and the first through hole 121 into the second through hole 111 / the third through hole 112, the locking assembly 13 is in a locked state, and the upper rod assembly 11 and the lower rod assembly 12 are fixed to each other.

[0047] In the present invention, the trigger element 133 is fixed in the fixing column 1351, and the sensing element 132 is fixed in the locking member and arranged in alignment with another first through hole 121. Specifically, the locking member includes a first locking member 1361 and a second locking member 1362 that are assembled and matched with each other, the fourth through hole 134 is provided on the first locking member 1361, and the sensing element 132 is fixed in the second locking member 1362. Preferably, the first locking member 1361 and the second locking member 1362 are both arranged in a semicircular shape, and the lower rod assembly 12 is accommodated in a circular cavity surrounded by the first locking member 1361 and the second locking member 1362.

[0048] The first locking member 1361 is provided with a first positioning portion 1363 at each of the four corners, and the second locking member 1362 is provided with a second positioning portion 1364 at each of the four corners, and the four first positioning portions 1363 and the four second positioning portions 1364 are aligned with each other. In this embodiment, the first positioning portion 1363 is a positioning column with a through hole, and the second positioning portion 1364 is a threaded column with a threaded hole. When the first locking member 1361 and the second locking member 1362 are assembled with each other, the first positioning portion 1363 and the second positioning portion 1364 are aligned with each other, and the through hole and the threaded hole are connected to each other. At this time, the first locking member 1361 and the second locking member 1362 can be locked and connected by screws passing through the through holes and locking with the threaded holes.

[0049] The buckle 135 is rotatably connected to the first locking member 1361. Preferably, a rotating shaft 1365 is fixed to one end of the first locking member 1361, and one end of the buckle 135 is sleeved on the rotating shaft 1365, so that the buckle 135 can rotate around the rotating shaft 1365. A clamping portion 1353 and a push-pull portion 1352 are provided at one end of the buckle 135. A rib 1366 is protrudingly provided on the side wall of the first locking member 1361. The clamping portion 1353 is used to snap-fit ​​with the rib 1366 to achieve a fixed connection between the buckle 135 and the first locking member 1361. The push-pull portion 1352 is used to make the clamping portion 1353 disengage from the rib 1366 under the action of an external force, so that the buckle 135 enters a released state.

[0050] A positioning block 1367 is provided on the inner side wall of the first locking member 1361 , and a positioning hole 122 is correspondingly opened on the lower rod assembly 12 . The positioning block 1367 is limitedly accommodated in the positioning hole 122 , thereby achieving a fixed connection between the first locking member 1361 and the lower rod assembly 12 .

[0051] In the present invention, the sensing element 132 and the triggering element 133 can be implemented in a variety of ways, as long as they can sense each other and enable the lawn mower 100 to start normally, and there is no limitation here. Three of the implementation ways will be described below by way of example.

[0052] Implementation method one, the sensing element 132 and the triggering element 133 are both photoelectric sensing devices. When the upper rod assembly 11 extends outward to the first position, the first through hole 121 and the second through hole 111 are aligned with each other. At this time, the sensing element 132 and the triggering element 133 can sense each other and conduct, and the lawn mower 100 can start normally; when the upper rod assembly 11 retracts inward to the second position, the third through hole 112 is aligned with one of the first through holes 121. At this time, the sensing element 132 and the triggering element 133 are separated by the upper rod assembly 11 / blocking structure 14, the sensing fails, and the lawn mower 100 cannot start.

[0053] Implementation method two, the sensing element 132 and the triggering element 133 are both Hall devices. When the upper rod assembly 11 extends outward to the first position, the first through hole 121 and the second through hole 111 are aligned with each other. At this time, the sensing element 132 and the triggering element 133 can sense each other and conduct, and the lawn mower 100 can start normally; when the upper rod assembly 11 retracts inward to the second position, the third through hole 112 is aligned with one of the first through holes 121. At this time, the sensing element 132 and the triggering element 133 are separated by the blocking structure 14, the induction fails, and the lawn mower 100 cannot be started.

[0054] Implementation method three, the sensing element 132 and the triggering element 133 are both mechanical switches. When the upper rod assembly 11 extends outward to the first position, the first through hole 121 and the second through hole 111 are aligned with each other. At this time, the sensing element 132 and the triggering element 133 can sense each other and conduct, and the lawn mower 100 can start normally; when the upper rod assembly 11 retracts inward to the second position, the third through hole 112 is aligned with one of the first through holes 121. At this time, the sensing element 132 and the triggering element 133 are separated by the blocking structure 14, the induction fails, and the lawn mower 100 cannot be started.

[0055] like Figure 2 As shown, the upper rod assembly 11 is in an extended state, and the locking assembly 13 locks and fixes the upper rod assembly 11 and the lower rod assembly 12. The upper rod assembly 11 cannot be extended or retracted. This state is the working state of the lawn mower 100. At this time, the sensing element 132 can sense the triggering element 133, and the locking assembly 13 is in a locked state, which allows the lawn mower 100 to be turned on.

[0056] like Figure 3 As shown, the upper rod assembly 11 is in a retracted state, the locking assembly 13 locks and fixes the upper rod assembly 11 and the lower rod assembly 12, and the upper rod assembly 11 cannot be extended or retracted. This state is the storage state of the lawn mower 100. In this state, although the locking assembly 13 is in a locked state, due to the existence of the blocking structure 14, the sensing element 132 cannot sense the triggering element 133, and the lawn mower 100 cannot be turned on.

[0057] When the locking assembly 13 is in the released state, the upper rod assembly 11 can freely extend and retract relative to the lower rod assembly 12. At this time, the trigger element 133 is away from the sensing element 132, and the sensing element 132 cannot sense the trigger element 133. At this time, the lawn mower 100 cannot be turned on.

[0058] To sum up, the handle 10 of the present invention arranges the upper rod assembly 11 and the lower rod assembly 12 so that only when the upper rod assembly 11 is extended to the first position relative to the lower rod assembly 12 and the locking element 131 locks the upper rod assembly 11 and the lower rod assembly 12 at the first position, the sensing element 132 and the triggering element 133 will sense each other and be connected, so that the lawn mower 100 can be started normally. In other cases, even if the locking assembly 13 is in a locked state, the sensing element 132 and the triggering element 133 cannot sense each other, and the lawn mower 100 cannot be started, thereby avoiding the occurrence of dangerous situations and enhancing safety.

[0059] The above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention.

Claims

1. A handle, characterized in that: include: Lower rod assembly; An upper rod assembly, the upper rod assembly can slide relative to the lower rod assembly, the upper rod assembly has an extended state and a retracted state, in which the upper rod assembly can extend outward to a first position relative to the lower rod assembly in the extended state; In the retracted state, the upper rod assembly can be retracted inwardly to a second position relative to the lower rod assembly; as well as A locking assembly, wherein the locking assembly can lock the upper rod assembly and the lower rod assembly, and the locking assembly has a released state and a locked state. In the released state, the upper rod assembly can slide relative to the lower rod assembly; In the locked state, the upper rod assembly and the lower rod assembly can be locked with each other at a first position; Wherein, the locking assembly includes a locking element and a sensing element and a triggering element fixed on the locking element, and the sensing element is arranged opposite to the triggering element; when and only when the upper rod assembly is extended to the first position relative to the lower rod assembly, and the locking element locks the upper rod assembly and the lower rod assembly at the first position, the sensing element and the triggering element sense each other and conduct.

2. The handle according to claim 1, characterized in that: Two first through holes arranged opposite to each other are provided at a position on the lower rod assembly connected to the upper rod assembly, and two second through holes arranged opposite to each other are provided at the first position of the upper rod assembly to align with the two first through holes. When the locking element locks the upper rod assembly and the lower rod assembly at the first position, the sensing element aligns with one of the first through hole and the second through hole, and the trigger element aligns with the other first through hole and the second through hole.

3. The handle according to claim 2, characterized in that: In the locked state, the upper rod assembly and the lower rod assembly can also lock each other at the second position; the upper rod assembly is provided with a third through hole at the second position, and the third through hole is provided with one to align with one of the first through holes, and when the locking element locks the upper rod assembly and the lower rod assembly at the second position, the trigger element is aligned with the third through hole, and the upper rod assembly separates the sensing element and the trigger element.

4. The handle according to claim 2, characterized in that: The locking element includes a locking piece fixed on the outer wall of the lower rod assembly and a holding piece rotatably connected to the locking piece, the locking piece is provided with a fourth through hole corresponding to one of the first through holes, the holding piece is protruding with a fixing column, and the fixing column is configured to be able to be inserted into the interior of the lower rod assembly from the fourth through hole and the first through hole.

5. The handle according to claim 4, characterized in that: When the holding member rotates in a direction away from the locking member and causes the fixing column to be separated from the first through hole and the fourth through hole, the locking assembly is in a released state.

6. The handle according to claim 4, characterized in that: The trigger element is fixed in the fixing column, and the sensing element is fixed in the locking member and is arranged in alignment with another first through hole.

7. The handle according to claim 6, characterized in that: The locking member includes a first locking member and a second locking member that are assembled and matched with each other, the buckling member is rotatably connected to the first locking member, the fourth through hole is opened on the first locking member, and the sensing element is fixed in the second locking member.

8. The handle according to claim 7, characterized in that: A rotating shaft is fixed to one end of the first locking member, and one end of the buckling member is sleeved on the rotating shaft so that the buckling member can rotate around the rotating shaft.

9. The handle according to claim 3, characterized in that: The sensing element and the triggering element are both photoelectric sensing devices. When the first through hole and the second through hole are aligned with each other, the sensing element and the triggering element can sense each other and conduct; when the first through hole and the third through hole are aligned with each other, the sensing element and the triggering element are separated by the upper rod assembly, and the sensing fails.

10. The handle according to claim 3, characterized in that: A blocking structure is provided at a second position inside the upper rod assembly to separate the third through hole from the inner cavity of the upper rod assembly.

11. The handle according to claim 10, characterized in that: The sensing element and the triggering element are both Hall devices or mechanical switches. When the first through hole and the second through hole are aligned with each other, the sensing element and the triggering element can sense each other and conduct; when the first through hole and the third through hole are aligned with each other, the sensing element and the triggering element are separated by the blocking structure, and the sensing fails.

12. A lawn mower, comprising a main body and a handle extending upward and backward from the main body, characterized in that: The handle comprises: Lower rod assembly; an upper rod assembly, the upper rod assembly being able to slide relative to the lower rod assembly, the upper rod assembly having an extended state and a retracted state, in which the upper rod assembly can extend outwardly to a first position relative to the lower rod assembly; in the retracted state, the upper rod assembly can retract inwardly to a second position relative to the lower rod assembly; and A locking assembly, wherein the locking assembly can lock the upper rod assembly and the lower rod assembly, and the locking assembly has a released state and a locked state. In the released state, the upper rod assembly can slide relative to the lower rod assembly; in the locked state, the upper rod assembly and the lower rod assembly can be locked with each other at a first position; Wherein, the locking assembly includes a locking element and a sensing element and a triggering element fixed on the locking element, and the sensing element is arranged opposite to the triggering element; when and only when the upper rod assembly is extended to the first position relative to the lower rod assembly, and the locking element locks the upper rod assembly and the lower rod assembly at the first position, the sensing element and the triggering element sense each other and conduct, so that the lawn mower can start working.

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