GARTENWERKZEUG

Description

Technical Field

[0001] The invention relates to a garden tool, in particular to an all-wheel drive garden tool.Background Art

[0002] At present, a garden tool, such as a lawnmower, is provided with a self-propelled mechanism. The self-propelled mechanism of the lawnmower is mostly set on the rear wheel axle of the lawnmower. When walking on uneven ground there may be a situation where the rear wheel is suspended, if the rear wheel falls into a pit which may cause a problem of insufficient walking power or inability to walk.

[0003] Chinese utility model CN208972006U partly solves the above problem by providing an energy efficient lawnmower which is adapted to better manage uphill climbing. The disclosed lawnmower comprises a pair of front traveling wheels and a pair of rear traveling wheels, and a self-propelled motor comprising a first self-propelled motor arranged to drive the front traveling wheels and a second self-propelled motor arranged to drive the rear traveling wheels.

[0004] Besides the problem of insufficient walking power or inability to walk, the lawnmower can only move forward, but not backward. The operator needs to stop the walking mechanism and then pull it back.

[0005] In order to solve the mentioned problem, US Patent Application No. US 2017 / 0367265 A1 discloses a lawnmower with a walking mechanism. The lawnmower comprises a main blade, an engine driving the main blade to operate. The engine also drives the walking mechanism to operate through a belt. By adjusting the tension of belts, the lawnmower can move forward or backward. However, this design is applied to engines powered by gasoline engines. Due to the high torque of gasoline engines, the main blade and the walking wheel can be driven to work simultaneously. However, in garden tools that use lithium batteries as an energy source, the motor torque is small, and the main blade and the walking wheel cannot be driven at the same time.

[0006] US 5375674 discloses a control for a lawn and garden vehicle, such control utilizes a "U" shaped main direction control pivotally mounted to the handlebars. The control is physically interconnected to a transmission such that movement of the direction control forward causes the vehicle to move forward, and movement of the direction control backward causes the vehicle to move in reverse with the control being spring biased into a central neutral position.

[0007] It is necessary to provide a garden tool to solve the above problems.Summary of Invention

[0008] The object of the present invention is to provide a garden tool, which not only doesn't slip when walking on uneven ground, but also automatically realizes walking backward, thereby facilitating an operator to turn quickly at a dead corner and improving the operator's operating experience.

[0009] In order to achieve the above object, the present invention provides a garden tool in accordance with claim 1, wherein the garden tool comprises a traveling assembly comprising a front wheel and a rear wheel, a travel-driving assembly comprising a front-drive mechanism driving the front wheel and a rear-drive mechanism driving the rear wheel and a control assembly controlling the front-wheel drive mechanism and the rear-wheel drive mechanism, the front wheel and rear wheel move forward or backward under the action of the front wheel-drive mechanism and the rear-wheel drive mechanism respectively, wherein the garden tool further comprises a push rod, and the push rod is provided with a speed regulating switch that cooperates with the travel-driving assembly to adjust a rotational speed of the travel-driving assembly and wherein the speed regulating switch comprises a first position, an middle position, and a second position, and wherein, when the speed regulating switch is between the first position and the middle position, the travel-driving assembly is rotatable at a forward speed, when the speed regulating switch is in the middle position, the rotational speed of travel-driving assembly is zero, when the speed regulating switch is between a middle position and a second position, the travel-driving assembly is rotatable at a backward speed and wherein, when the control assembly detects that the speed regulating switch moves from a position between the first position and the middle position to a position between the middle position and the second position, that is, when the speed regulating switch changes from a forward position to a backward position, the travel-driving assembly is configured to stop working within a first preset time, then a display assembly displays information about the backward position, and an alarm assembly issues an alarm signal, and wherein, when the first preset time has elapsed, the control assembly is configured to activate the travel-driving assembly and control the garden tool to walk backward.

[0010] In one embodiment, wherein the maximum backward speed of the travel-driving assembly is not higher than half of a maximum forward speed of the travel-driving assembly.

[0011] In one embodiment, the speed regulating switch further comprises a filtering assembly to filter a signal output from the speed regulating switch.

[0012] In one embodiment, the garden tool further comprises a pulse width modulation assembly, and the pulse width modulation assembly is set to gradually increase a duty ratio so that the rotational speed of the travel-driving assembly is gradually increased to a preset speed.

[0013] In one embodiment, the garden tool further comprises a speed detection assembly; and when the speed detection assembly detects that the rotational speed of the travel-driving assembly is higher than a preset rotational speed, the speed detection assembly is configured to control the pulse width modulation assembly to gradually reduce the duty ratio to gradually reduce the rotational speed of the travel-driving assembly to the preset rotational speed.

[0014] In one embodiment, the pulse width modulation assembly comprises a front pulse width modulator that cooperates with the front-drive mechanism and a rear pulse width modulator that cooperates with the rear-drive mechanism, and the speed detection assembly comprises a front speed detector that cooperates with the front-drive mechanism and a rear speed detector that cooperates with the rear-drive mechanism.

[0015] In one embodiment, the travel-driving assembly is further provided with a soft starter to smoothly start the travel-driving assembly without impact during the starting process.

[0016] In one embodiment, the garden tool is further provided with an alarm assembly, which when the control assembly detects that the running current of the travel-driving assembly is maintained higher than a preset threshold value during a preset running time, is configured to stop the travel-driving assembly.

[0017] In one embodiment the travel-driving assembly is configured to let an operator set the first predetermined time.

[0018] In one embodiment, the alarm assembly is configured to alert an operator in the form of sound or light

[0019] The beneficial effect of the present invention is that the garden tool of the present invention not only doesn't slip when walking on uneven ground, but also automatically realizes walking backward, thereby facilitating the operator to turn quickly at a dead corner and improving the operator's operating experience.Brief Description of Drawings

[0020] FIG. 1 is a perspective view of a three-dimensional structure of the garden tool according to the present invention. FIG. 2 is a bottom view of the garden tool shown in FIG. 1. FIG. 3 is a partially enlarged schematic view of a push rod. Fig. 4 is a sectional view of a self-propelled start switch. FIG. 5 is a perspective view of the self-propelled start switch. Fig. 6 is a schematic block diagram of the garden tool according to the present invention. Description of Embodiments

[0021] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the following describes the present invention in detail with reference to the accompanying drawings and specific embodiments.

[0022] Please refer to FIG. 1 and FIG. 2, the invention discloses a garden tool 100 comprising a housing 10, a work assembly (not shown) mounted on the housing 10, a work-driving assembly 70 (shown in FIG. 6) for driving the work assembly, a traveling assembly 20 mounted on the housing 10, a travel-driving assembly 30 that drives the traveling assembly 20, a control assembly 40, a display assembly 50, and an alarm assembly 60. The work assembly may be a blade, a mowing rope, etc., and the invention does not limit the specific structure of the work assembly. In one embodiment, the work-driving assembly 70 is a motor.

[0023] Please refer to FIG. 1, FIG. 2 and FIG. 3, the housing 10 comprises a body 11 and a push rod 12 mounted on the body 11. The push rod 12 is provided with a self-propelled start switch 121 and a speed regulating switch 122 that can control the travel-driving assembly 30. When the self-propelled start switch 121 is pushed, the travel-driving assembly 30 is powered on. Please refer to FIG. 4 and FIG. 5. In this embodiment, the self-propelled start switch 121 comprises a contact 1211, a resisting block 1212 that cooperates with the contact 1211, a paddle 1213 that is pivotally mounted on the push rod 12, and an elastic element 1214 cooperating with the paddle 1213. When the paddle 1213 is pushed, the paddle 1213 rotates and drives the resisting block 1212 to move and make contact with the contact 1211. At this time, the elastic element 1214 undergoes elastic deformation, and the travel-driving assembly 30 is powered on. When the paddle 1213 is released, the paddle 1213 is reset under that action of the elastic element 1214, and the resisting block 1212 is out of contact with the contact 1211. The travel-driving assembly 30 is powered off. In this embodiment, the elastic element 1214 is a torsion spring.

[0024] Please refer to FIG. 3, the speed regulating switch 122 is used to adjust the speed of the travel-driving assembly 30. The speed regulating switch 122 can rotate left and right along an axis. The speed regulating switch 122 comprises a first position (left side position), a middle position (not shown), and a second position (right side position). When the speed regulating switch 122 is between the first position and the middle position, the travel-driving assembly 30 rotates forward, and the traveling assembly 20 walks forward. Wherein, when the speed regulating switch 122 is in the first position, the travel-driving assembly 30 rotates at maximum forward speed. When the speed regulating switch 122 is in the middle position, the rotational speed of the travel-driving assembly 30 is zero. When the speed regulating switch 122 is between the middle position and the second position, the travel-driving assembly 30 rotates backward, and the traveling assembly 20 walks backward. Wherein, when the speed regulating switch 122 is in the second position, the travel-driving assembly 30 rotates at maximum backward speed. Preferably, the maximum backward speed of the travel-driving assembly 30 is not greater than half of the maximum forward speed of the travel-driving assembly 30. Further, the speed regulating switch 122 further comprises a filtering assembly (not shown) to filter the signal output by the speed regulating switch 122, so that the rotational speed of the travel-driving assembly 30 changes smoothly, thereby increasing the operator's comfort. The filtering assembly may be a filtering circuit or filtering software. The invention does not limit the specific structure of the filtering assembly. Preferably, the travel-driving assembly 30 may further be provided with a soft starter (not shown) to smoothly start the travel-driving assembly 30 without impact during the startup process, thereby improving the operator's comfort.

[0025] Please refer to FIG. 1 and FIG. 2, the traveling assembly 20 comprises a front wheel 21, a front transmission assembly 22 that cooperates with the front wheel 21, a rear wheel 23, and a rear transmission assembly 24 that cooperates with the rear wheel 23. The travel-driving assembly 30 comprises a front-drive mechanism 31 that cooperates with the front transmission assembly 22 and a rear-drive mechanism 32 that cooperates with the rear transmission assembly 24. In this embodiment, the front-drive mechanism 31 and the rear-drive mechanism 32 are both motors. In this embodiment, the front-drive mechanism 31 and the rear-drive mechanism 32 work at the same time, that is, both of them rotate forward or backward at the same time or stop working at the same time. Preferably, the garden tool 100 may further include a pulse width modulation assembly (not shown) that cooperates with a power supply assembly (not shown) and the travel-driving assembly 30. The pulse width modulation assembly is set to gradually increase the duty ratio, so that the rotational speed of the travel-driving assembly is gradually increased to a preset rotational speed. The preset rotational speed is usually set by the speed regulating switch 122. In this way, the increase in rotational speed of the traveling assembly 20 has a changing process, so that the operator can slowly adapt to the increase in speed, which can effectively prevent the garden tool 100 from travelling forward suddenly to cause the push rod 12 to disengage from the operator when the operator adjusts the speed through the speed regulating switch 122. Further, the garden tool 100 may further comprise a speed detection assembly (not shown). When the speed detection assembly detects that the rotational speed of the travel-driving assembly 30 is higher than a preset rotational speed, the speed detection assembly controls the pulse width modulation assembly to gradually reduce the duty cycle so that the rotational speed of the travel-driving assembly 30 is reduced to the preset speed. Preferably, the pulse width modulation assembly comprises a front pulse width modulator (not shown) that cooperates with the front-drive mechanism 31 and a rear pulse width modulator (not shown) that cooperates with the rear-drive mechanism 32. The speed detection assembly comprises a front speed detector (not shown) that cooperates with the front-drive mechanism 31 and a rear speed detector (not shown) that cooperates with the rear-drive mechanism 32. In this way, the rotational speed of the front-drive mechanism 31 and the rear-drive mechanism 32 can be adjusted and controlled separately in real time, so that the problem of the speed difference between the front-drive mechanism 31 and the rear-drive mechanism 32 can be effectively solved, and the phenomena of skidding and inability to climb slopes can be effectively improved when the front wheel and the rear wheel have different loads on the ground.

[0026] Please refer to FIG. 6, the control assembly 40 is used to control the operation of the front-drive mechanism 31 and the rear-drive mechanism 32, so that the front wheels 21 and the rear wheels 23 move forward or backward respectively under the action of the front-drive mechanism 31 and the rear-drive mechanism 32. At the same time, the control assembly 40 is also used to detect the rotate direction of the travel-driving assembly 30 and the running current of the travel-driving assembly 30. When the control assembly 40 detects that the travel-driving assembly 30 rotates in a backward direction, the control assembly 40 controls the work-driving assembly 70 to stop working to prevent the working assembly from continuing to work and causing harm to the operator. When the control assembly 40 detects that the speed regulating switch 122 moves from a position between the first position and the middle position to a position between the middle position and the second position, that is, when the speed regulating switch 122 changes from a forward position to a backward position, the travel-driving assembly 30 stops working within a first preset time, then the display assembly 50 displays the backward information, and the alarm assembly 60 issues an alarm signal. The alarm assembly 60 may be a horn or an alarm light. The first preset time may be set by an operator, for example, 3 seconds, 5 seconds, and so on. When the first preset time has elapsed, the control assembly 40 activates the travel-driving assembly 30 and controls the garden tool 100 to walk backward. When the control assembly 40 detects that the running current of the travel-driving assembly 30 is higher than a preset threshold and the travel-driving assembly 30 maintains the operating current for a preset running time, the control assembly 40 controls the travel-driving assembly 30 to prevent the motor from working for a long time with high current and causing serious heating of the motor, thereby affecting the service life of the motor.

[0027] Compared with the prior art, the garden tool 100 of the present invention drives the front wheel 21 and the rear wheel 23 forward or backward respectively through the front-drive mechanism 31 and the rear-drive mechanism 32, so that the garden tool 100 can not only automatically walk backward, but also can ensure that the traveling assembly 20 can obtain sufficient power, thereby the garden tool 100 does not slip when climbing or walking backward.

[0028] The above embodiments are only used to illustrate the present disclosure and not to limit the technical solutions described in the present disclosure. The understanding of this specification should be based on those skilled in the art. Although the present disclosure has been described in detail with reference to the above embodiments, however, those skilled in the art should understand that this can be varied within the scope of the appended claims.

Claims

1. A garden tool (100) comprising: a traveling assembly (20) comprising a front wheel (21) and a rear wheel (23); a travel-driving assembly (30) comprising a front-drive mechanism (31) driving the front wheel (21) and a rear-drive mechanism (32) driving the rear wheel (23); and a control assembly (40) controlling the front-wheel drive mechanism (31) and the rear-wheel drive mechanism (32), the front wheel (21) and rear wheel (23) move forward or backward under the action of the front wheel-drive mechanism (31) and the rear-wheel drive mechanism (32) respectively, the garden tool (100) further comprises a push rod (12), and the push rod (12) is provided with a speed regulating switch (122) that cooperates with the travel-driving assembly (30) to adjust a rotational speed of the travel-driving assembly (30); and wherein the speed regulating switch (122) comprises a first position, a middle position, and a second position, and wherein, when the speed regulating switch (122) is between the first position and the middle position, the travel-driving assembly (30) is rotatable at a forward speed, when the speed regulating switch (122) is in the middle position, the rotational speed of the travel-driving assembly (30) is zero, and when the speed regulating switch (122) is between a middle position and a second position, the travel-driving assembly (30) is rotatable at a backward speed, characterized in that, when the control assembly (40) detects that the speed regulating switch (122) moves from a position between the first position and the middle position to a position between the middle position and the second position, that is, when the speed regulating switch (122) changes from a forward position to a backward position, the travel-driving assembly (30) is configured to stop working within a first preset time, then a display assembly (50) displays information about the backward position, and an alarm assembly (60) issues an alarm signal, and wherein, when the first preset time has elapsed, the control assembly (40) is configured to activate the travel-driving assembly (30) and control the garden tool (100) to walk backward.

2. The garden tool according to claim 1, wherein a maximum backward speed of the travel-driving assembly (30) is not higher than half of a maximum forward speed of the travel-driving assembly (30).

3. The garden tool according to any one of claims 1 or 2, wherein the speed regulating switch (122) further comprises a filtering assembly to filter a signal output from the speed regulating switch (122).

4. The garden tool according to any one of claims 1 to 3, wherein the garden tool (100) further comprises a pulse width modulation assembly, and the pulse width modulation assembly is set to gradually increase a duty ratio so that the rotational speed of the travel-driving assembly (30) is gradually increased to a preset speed.

5. The garden tool according to claim 4, wherein the garden tool (100) further comprises a speed detection assembly; and when the speed detection assembly detects that the rotational speed of the travel-driving assembly (30) is higher than a preset rotational speed, the speed detection assembly is configured to control the pulse width modulation assembly to gradually reduce the duty ratio to gradually reduce the rotational speed of the travel-driving assembly (30) to the preset rotational speed.

6. The garden tool according to claim 5, wherein the pulse width modulation assembly comprises a front pulse width modulator that cooperates with the front-drive mechanism (31) and a rear pulse width modulator that cooperates with the rear-drive mechanism (32), and the speed detection assembly comprises a front speed detector that cooperates with the front-drive mechanism (31) and a rear speed detector that cooperates with the rear-drive mechanism (32).

7. The garden tool according to any one of claims 1 to 6, wherein the travel-driving assembly (30) is further provided with a soft starter to smoothly start the travel-driving assembly without impact during the starting process.

8. The garden tool according to any one of claims 1 to 7, wherein the garden tool (30) is further provided with an alarm assembly (60), which when the control assembly (40) detects that the running current of the travel-driving assembly (30) is maintained higher than a preset threshold value during a preset running time, is configured to stop the travel-driving assembly (30).

9. The garden tool according to any one of claims 1 to 8, wherein the travel-driving assembly (30) is configurable to let an operator set the first predetermined time.

10. The garden tool according to any one of claims 1 to 7, wherein the alarm assembly (60) is configured to alert an operator in the form of sound or light.