Patent Description:
Currently, the garden tool can be used either in self-propelled walking mode, or in manually pushed or pulled walking mode, which cannot meet people's usage requirements.

<CIT> discloses speed-control means for a walk-with vehicle or other walk-with apparatus, said means comprising a handle, a reference member relative to which the handle has a forward range of movement in which it can move in a forward direction to control increase in forward speed of the apparatus and incrementally backwards to control reduction in the forward speed, and means to convert positions of the handle into electric signals to control the speed. This may be termed "an intuitive movement handle" since a forward movement of the handle causes increase in forward speed of the apparatus and an incremental backwards movement of the handle from any particular forward speed position causes a reduction in forward speed. Said speed-control means are adapted for mechanical connection to said apparatus.

An object of the present application is to provide a power device. This is achieved with power device, comprising:.

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only partial embodiments of the present invention. For those skilled in the art, other drawings may be obtained according to these drawings without any creative work, in which:.

Reference numerals in the <FIG>, push rod; <NUM>, panel assembly; <NUM>, upper panel; <NUM>, lower panel; <NUM>, guideway; <NUM>, lock knob; <NUM>, lock shaft; <NUM>, self-propelled key; <NUM>, buckle slot; <NUM>, positioning hole; <NUM>, self-propelled key knob; <NUM>, key reset spring; <NUM>, starting switch; <NUM>, starting key; <NUM>, movable contact block; <NUM>, pull rod; <NUM>, compression block; <NUM>, gear; <NUM>, elastic connector; <NUM>, motor rotation switch; <NUM>, button unit; <NUM>, pressing head; 821a, pressing head button; <NUM>, button reset spring; <NUM>, connecting assembly; <NUM>, sliding plate; <NUM>, hanging plate; 832a, convex structure; <NUM>, hanging plate torsion spring; <NUM>, operating assembly; <NUM>, pulling plate; 841a, rack; 841b, clamping groove; <NUM>, pulling plate reset spring; <NUM>, power device; <NUM>, housing; <NUM>, first motor; <NUM>, second motor; <NUM>, self-propelled switch; <NUM>, sliding potentiometer; <NUM>, potentiometer base; <NUM>, sliding needle; <NUM>, reset rod; 101a, main rod; 101b, auxiliary rod; <NUM>, reset rod return spring; <NUM>, chuck.

Currently, the garden tool can only be used in self-propelled walking mode, or can only walk by manually pushed or pulled, which can not meet people's usage requirements.

In view of the above problems, an embodiment of the present invention discloses a control panel comprising lock assemblies connected to a panel assembly. The lock assemblies can lock the panel assembly on a push rod. It also can unlock the panel assembly and the push rod, so that a device in which the control panel is disposed, can be switched between a manual-power driving mode and a self-propelled driving mode, which meet people's usage requirements.

In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, references will be made to the figures to describe the embodiments of the present disclosure in detail.

Referring to <FIG>, the embodiment of the present invention discloses the control panel. The control panel comprises the push rod <NUM> connected to a machine body, the panel assembly <NUM> reciprocatingly sliding along the push rod <NUM> and the lock assemblies connected to the panel assembly <NUM>. The lock assemblies can either lock the panel assembly <NUM> on the push rod <NUM>, or unlock the panel assembly <NUM> from the push rod <NUM>.

In this preferred embodiment, the panel assembly <NUM> comprises an upper panel <NUM> and a lower panel <NUM> connected to the upper panel <NUM>. The push rod <NUM> can be a U-shaped push rod.

In this preferred embodiment, the push rod <NUM> are usually provided with guideways <NUM> at opposite sides thereof with the panel assembly <NUM> reciprocatingly sliding on the guideways <NUM>.

In one embodiment of the present invention, the lock assemblies comprises a lock knob <NUM> connected to the panel assembly <NUM>, and at least one lock shaft <NUM> connected to the lock knob <NUM> and clamped with the push rod <NUM>.

When the lock shaft <NUM> enters into the push rod <NUM>, the panel assembly <NUM> will be locked on the push rod <NUM>. At this time, the device in which the control panel is disposed, can only work in the manual-power driving mode. When the lock shaft <NUM> exits from the push rod <NUM>, the panel assembly <NUM> can automatically slide along the push rod <NUM>, that is, the panel assembly <NUM> is unlocked. At this time, the device in which the control panel is disposed, can work in self-propelled driving mode.

In one embodiment of the present invention, the lock shafts <NUM> can be arranged on two sides of the lock knob <NUM>. A plurality of push rod holes can be arranged at the corresponding positions of the guideways <NUM>. The lock shafts <NUM> can lock the panel assembly <NUM> in different positions of the push rod <NUM> by inserting in the corresponding push rod holes of the push rod <NUM>.

In one embodiment of the present invention, the panel assembly <NUM> comprises a first switch unit connected with the lock knob <NUM>. The first switch unit is adapted to control the lock shaft <NUM> to lock or unlock the panel assembly <NUM> through the lock knob <NUM>. When the first switch unit controls the lock shaft <NUM> to lock the panel assembly <NUM> through the lock knob <NUM>, the first motor for providing the self-propelled power for the device with the control panel is closed. When the first switch unit controls the lock shaft <NUM> to unlock the panel assembly <NUM> through the lock knob <NUM>, the first motor for providing the self-propelled power for the device with the control panel is started, and the device can work in self-propelled driving mode.

The first switch unit is configured to prevent the panel assembly <NUM> from unlocking or locking by mistake. The accident caused by unlocking or locking the panel assembly <NUM> through directly operating the lock knob <NUM> can be avoided. The safety of the equipment is improved consequently.

In one embodiment of the present invention, the first switch unit comprises a self-propelled key <NUM> connected with the lock knob <NUM>. The self-propelled key <NUM> is clamped with the lock knob <NUM>, and the lock knob <NUM> is driven to rotate by rotating the self-propelled key <NUM>, thereby enabling the lock shaft <NUM> to unlock the panel assembly <NUM> through exiting from the push rod <NUM>.

In one embodiment of the present invention, a buckle body (not shown) is assembled on the self-propelled key <NUM>. A buckle slot <NUM> engaged with the buckle body is arranged on the lock knob <NUM>. When the self-propelled key <NUM> is moved downwards and rotated, the buckle body can be clamped in the buckle slot <NUM>. The lock knob <NUM> can be driven to rotate by continually rotating the self-propelled key <NUM>.

In the preferred embodiment, both of the cross sections of the buckle body and the buckle slot <NUM> can be cross-shaped, or zigzag, or star-shaped. That is, no limitation on the cross-sectional shape is required.

In one embodiment of the present invention, the first switch unit can further comprise a positioning assembly connected with the self-propelled key <NUM>. The positioning assembly is adapted to fix the self-propelled key <NUM>.

Referring to <FIG>, in the preferred embodiment, the positioning assembly comprises a number of positioning holes <NUM> arranged on the panel assembly <NUM> and a number of location columns (not shown) arranged on the self-propelled key <NUM>. The location columns are received within the positioning holes <NUM>. The self-propelled key <NUM> is fixed by the engagement between the location columns and the positioning holes <NUM>.

In the preferred embodiment, the quantity of the positioning holes <NUM> and the location columns are not restricted. Such as, the quantity of the location columns can be four, and the quantity of the location columns can be two.

Referring to <FIG> and <FIG>, in one embodiment of the present invention, the first switch unit can further comprise a self-propelled key knob <NUM> assembled on the self-propelled key <NUM>. The self-propelled key <NUM> is driven to move up and down by the self-propelled key knob <NUM>.

Referring to <FIG>, in one embodiment of the present invention, the first switch unit can further comprise a key reset spring <NUM> sleeved on the self-propelled key knob <NUM>. The key reset spring <NUM> is adapted to reset the location of the self-propelled key <NUM>.

During applying the present invention, the self-propelled key <NUM> can be driven to move downwards to thereby separating from the positioning holes <NUM> by pressing down the self-propelled key knob <NUM>. The buckle body, on the bottom of the self-propelled key <NUM>, can be driven to clamp in the buckle slot <NUM> of the lock knob <NUM> by rotating the self-propelled key knob <NUM>. Then, the self-propelled key <NUM> is driven to rotate by continually rotating the self-propelled key knob <NUM>, with the self-propelled key knob <NUM> rotating and with the left/right lock shafts <NUM>, which connect with the self-propelled key knob <NUM>, driven to compress and separate from the push rod <NUM> under the rotation of the self-propelled key knob <NUM>. At this moment, the panel assembly <NUM> is unlocked and can freely slide on the push rod <NUM>.

After releasing the self-propelled key knob <NUM>, the self-propelled key <NUM> is ejected from the lock knob <NUM> under the action of the key reset spring <NUM>. The self-propelled key <NUM> is inserted into the corresponding positioning holes <NUM> of the self-propelled key <NUM> through the positioning columns, then the device enters in the manual-power driving mode.

During applying the present invention, the lock knob <NUM> can be arranged on the lower panel <NUM>. The self-propelled key knob <NUM> and the self-propelled key <NUM> can be arranged on the upper panel <NUM>.

Referring to <FIG> and <FIG>, another embodiment of the present invention discloses the control panel comprising the panel assembly <NUM> and a starting switch <NUM> arranged on the panel assembly <NUM>. The starting switch <NUM> is adapted to open or close the second motor provided power for the device in which the control panel is disposed.

A first starting unit is disposed on the panel assembly <NUM>, which comprises a starting key <NUM> disposed on the panel assembly <NUM> and being moveable up and down, and a pull rod <NUM> movably connected to the panel assembly <NUM>. When the starting key <NUM> moves to a bottom of the panel assembly <NUM>, the bottom of the starting key <NUM> will touch and start the starting switch <NUM> under a push of the bottom of the pull rod <NUM>. The starting switch <NUM> will be closed when the bottom of the starting key <NUM> is disconnected from the starting switch <NUM>.

The first starting unit is arranged to avoid the accident caused by starting or closing the second motor through operating the starting switch <NUM> by mistake, and the safety of the device can be further improved.

In the preferred embodiment, the device can be a lawn mower, in which the control panel is disposed. The second motor can be a motor driving the cutter of the lawn mower to rotate. When the device is a snow sweeper, in which the control panel is disposed, the second motor can be a motor driving the impeller of the snow sweeper to rotate.

In one embodiment of the present invention, the pull rod <NUM> comprises a compression block <NUM> adapted for pushing the starting key <NUM> to touch the starting switch <NUM> as the pull rod <NUM> rotating. A distance between the starting switch <NUM> and the compression block <NUM> is larger than a displacement distance of the compression block <NUM> caused by the rotation thereof.

In one embodiment of the present invention, the starting key <NUM> comprises a movable contact block <NUM> in contact with the starting switch <NUM> pushed by the compression block <NUM>. One end of the movable contact block <NUM> is movably connected to the starting key <NUM>, and the other end is in a suspended form. The movable contact block <NUM> is pushed by the compression block <NUM> to contact the starting switch <NUM>, thereby starting the starting switch <NUM>.

In one embodiment of the present invention, the movable contact block <NUM> can be movably connected to the starting key <NUM> through an elastic connector <NUM>. The elastic connector <NUM> can be a metal dome, or a spring.

During applying the present invention, the starting key <NUM> can pass through the upper panel of the panel assembly <NUM> and be disposed on the lower panel of the panel assembly <NUM>. Both the pull rod <NUM> and the starting switch <NUM> can be assembled onto the lower panel of the panel assembly <NUM>.

During applying the present invention, the starting switch <NUM> can be opened or closed by inserting the starting key <NUM> into the panel assembly <NUM>. No limitation is required here.

When the starting key <NUM> is pulled out from the panel assembly <NUM> or is not pressed, the starting switch <NUM> will not be touched if operating the pull rod <NUM>, since the compression block <NUM> of the pull rod <NUM> cannot contact with the movable contact block <NUM>. When the starting key <NUM> is inserted into the panel assembly <NUM> or moves downwards to the bottom of the lower panel <NUM> of the panel assembly <NUM>, the compression block <NUM> of the pull rod <NUM>, can be in contact with the movable contact block <NUM> if operating the pull rod <NUM>. Then, the movable contact block <NUM> can touch the starting switch <NUM> to thereby staring the starting switch <NUM>, under the effect of the compression block <NUM> of the pull rod <NUM>.

Referring to <FIG> and <FIG>, the embodiment of the present invention discloses an automatic switching device comprising a push rod <NUM> connected to a machine body and a panel assembly <NUM> reciprocatingly sliding on the push rod <NUM>. A motor rotation switch <NUM> is arranged in the panel assembly <NUM> and adapted for opening or closing the second motor provided power for the device.

A second starting unit is disposed on the panel assembly <NUM>. The second starting unit can comprise a button unit <NUM>, a connecting assembly <NUM>, and an operating assembly <NUM>, wherein:.

The button unit <NUM> moves downwards to press the connecting assembly <NUM> to connect with the operating assembly <NUM>. The connecting assembly <NUM> is driven to move and press on the motor rotation switch <NUM> by moving the operating assembly <NUM>, so that the motor rotation switch <NUM> is triggered.

The second starting unit is configured to avoid the accident caused by starting or closing the second motor through operating the motor rotation switch <NUM> by mistake, and the safety of the device can be further improved.

In one embodiment of the present invention, the operating assembly <NUM> comprises a pull rod <NUM> movably connected to the panel assembly <NUM> and a pulling plate <NUM> driven by the pull rod <NUM>. The button unit <NUM> comprises a pressing head <NUM> suitable for a pressing operation exerted thereon. The connecting assembly <NUM> comprises a sliding plate <NUM> movably connected with the panel assembly <NUM> and a hanging plate <NUM> movably connected with the sliding plate <NUM>.

The pressing head <NUM> is arranged on the upper part of the hanging plate <NUM>, one end of the hanging plate <NUM> is located on the upper part of the pulling plate <NUM>. The pressing head <NUM> is pressed down to engage the hanging plate <NUM> and the pulling plate <NUM>. The hanging plate <NUM> is driven to move by moving the pulling plate <NUM> driven by the pull rod <NUM>, and the sliding plate <NUM> is driven to move along the panel assembly <NUM> to trigger the motor rotation switch <NUM> through the hanging plate <NUM>.

In one embodiment of the present invention, the pull rod <NUM> is connected with the pulling plate <NUM>. The pulling plate <NUM> is driven to move on the panel assembly <NUM> through translating the pull rod <NUM> on the panel assembly <NUM>.

During applying the present invention, the pull rod <NUM> can be connected to the pulling plate <NUM> in a variety of ways. In one embodiment of the invention, the end of the pull rod <NUM> connected with the pulling plate <NUM> can be arranged with a gear <NUM>, and the end of the pulling plate <NUM> connected with the pull rod <NUM> can be arranged with a rack 841a engaged with the gear <NUM>. The pulling plate <NUM> can be driven to move by turning the pull rod <NUM> with the cooperation of the gear <NUM> and rack 841a.

During applying the present invention, the hanging plate <NUM> can be clamped with the pulling plate <NUM> in a variety of ways. In one embodiment of the invention, a clamping groove 841b can be arranged on the pulling plate <NUM>. One end of the hanging plate <NUM> is hinged on the sliding plate <NUM>, and the other end of the hanging plate <NUM> is provided with a convex structure 832a clamped to the clamping groove 841b. When the pressing head <NUM> is depressed, the clamping groove 841b on the pulling plate <NUM> can be driven to engage with the convex structure 832a on the hanging plate <NUM>, thereby making the hanging plate <NUM> clamped with the pulling plate <NUM>.

In one embodiment of the present invention, in order to facilitate receiving the pressing operation, a pressing head button 821a can be arranged and connected at the upper end of the pressing head <NUM>. The pressing head <NUM> can be driven to move downwards by pressing the pressing head button 821a.

In one embodiment of the present invention, the button unit <NUM> can be further comprise a button reset spring <NUM> arranged between the pressing head <NUM> and the pressing head button 821a. The button reset spring <NUM> is arranged to reset the location of the pressing head button 821a.

In one embodiment of the present invention, the operating assembly <NUM> can be further comprise a pulling plate reset spring <NUM> arranged between the pulling plate <NUM> and the panel assembly <NUM>. The pulling plate reset spring <NUM> is provided to reset the location of the pulling plate <NUM>.

In one embodiment of the present invention, the connecting assembly <NUM> can be further comprise a hanging plate torsion spring <NUM> connected with the hanging plate <NUM>. The hanging plate torsion spring <NUM> is arranged to reset the location of the hanging plate <NUM>.

In the preferred embodiment, the button unit <NUM> can be arranged on the upper panel <NUM> of the panel assembly <NUM>. The connecting assembly <NUM> and the motor rotation switch <NUM> can be arranged on the lower panel <NUM> of the panel assembly <NUM>.

It is to be understood, in the preferred embodiment, the automatic switching device can be arranged on the control panel. In other words, the automatic switching device can also serve as a control panel in another embodiment.

It is to be understood, in the preferred embodiment, the control panel can just integrate the lock assemblies with the first switch unit, or just integrate the starting switch <NUM> with the first starting unit, or just integrate the motor rotation switch <NUM> with the second starting unit. Of course, the control panel can integrate any two of or all of the components in above embodiments. That is, no limitation is required.

Referring to <FIG>, an embodiment of the present invention also discloses a power device <NUM>. The power device <NUM> comprises a housing <NUM>, a first motor <NUM> and a second motor <NUM> located in the housing <NUM>, and a control panel. The first motor <NUM> is adapted to provide self-propelled power, and the second motor <NUM> is adapted to provide working power for the power device <NUM>.

Referring to <FIG>, the control panel comprises a push rod <NUM> extending outward from the inner of the housing <NUM>, and a guideway <NUM> fixed on the push rod <NUM>, and a panel assembly <NUM> sliding along the guideway <NUM>. The control panel further comprises lock assemblies connected to the panel assembly <NUM>. They are adapted to lock or unlock the panel assembly <NUM> on the push rod <NUM>, so that the power device <NUM> is switched between a manual-power driving mode and a self-propelled driving mode.

Referring to <FIG> and <FIG>, in one embodiment of the present invention, the power device <NUM> further comprises a self-propelled switch <NUM>. The self-propelled switch <NUM> is electrically connected with the lock assemblies and the first motor <NUM>, and it is adapted to start or close the first motor.

In one embodiment of the present invention, the power device <NUM> can be in a self-propelled driving mode by operating the self-propelled switch <NUM>. When the power device <NUM> is in the self-propelled driving mode, the lock assemblies are also adapted to fix the self-propelled speed of the power device <NUM> at different values, so that the power device <NUM> can be switched in the variable speed self-propelled driving mode and the constant speed self-propelled driving mode to further improve the user experience.

During applying the present invention, the lock assemblies are configured to fix the self-propelling speed of the power device <NUM> at different values, and the lock assemblies can be in several different structures. In one embodiment of the invention, the self-propelling speed of the power device <NUM> can be fixed at different values by fixing the panel assembly <NUM> at different positions onto the push rod <NUM>.

During applying the present invention, a number of positioning holes can be arranged at different positions of the push rod <NUM>, and the lock assemblies can lock the panel assembly <NUM> at different positioning holes, in such a manner that fixed the self-propelling speed of the power device <NUM> at different values.

Referring to <FIG>, in one embodiment of the present invention, the lock assemblies comprise a lock knob <NUM> connected to the panel assembly <NUM>, and at least one lock shaft <NUM> connected to the lock knob <NUM> and clamped with the push rod <NUM>.

When the lock shaft <NUM> enters into the push rod <NUM>, the panel assembly <NUM> is locked on the push rod <NUM>. When the lock shaft <NUM> exits from the push rod, the panel assembly <NUM> can automatically slide along the push rod <NUM>. That is, the panel assembly <NUM> is unlocked.

During applying the present invention, the lock knob <NUM> of the power device <NUM> can be arranged in conjunction with the self-propelled switch <NUM>, that is, the on-off of the self-propelled switch <NUM> can be controlled by the rotation of the lock knob <NUM>.

For example, when the power device <NUM> needs to be operated, the operator can operate the self-propelled key <NUM> by turning the self-propelled key knob <NUM>. The lock knob <NUM> is driven to rotate by the rotation of the self-propelled key <NUM> and touch the self-propelled switch <NUM>. When the first motor <NUM> is started, the power device <NUM> can switch between a variable speed self-propelled driving mode and a constant speed self-propelled driving mode by operating the lock knob <NUM>.

During applying the present invention, when the panel assembly <NUM> is locked at a certain position of the push rod <NUM>, the power device <NUM> operates in a constant speed self-propelled driving mode. When the panel assembly <NUM> is not locked onto the push rod <NUM>, the power device <NUM> operates in a variable speed self-propelled driving mode.

During applying the present invention, the paces of the triggering of the self-propelled switch <NUM> and the unlocking of the lock shaft <NUM> can be synchronized or not. That is, no limitation is required. Taking the triggering of the self-propelled switch <NUM> and unlocking of the lock shaft <NUM> be synchronized as an example, while the lock knob <NUM> touches the self-propelled switch <NUM>, the lock shaft <NUM> connected with the lock knob <NUM> can be unlocked from the push rod <NUM>. At this moment, the control panel can slide along the handle. When the self-propelled switch <NUM> is closed, the first motor <NUM> is in standby state, and the rotating speed of the first motor <NUM> is zero.

During applying the present invention, the lock knob <NUM> and the self-propelled switch <NUM> of the power device <NUM> can also be non-linkage setting. Such as, a separate external switch can be arranged to start or close the self-propelled switch <NUM>, or the self-propelled switch <NUM> can be directly operated. At this time, the rotating and closing of the lock knob <NUM> do not affect the on-off of the self-propelled switch <NUM>.

During applying the present invention, the self-propelled speed range of the power device <NUM> can be within [<NUM>, <NUM>/s].

During applying the present invention, the lock knob <NUM> and the lock shaft <NUM> can be implemented with reference to the description of the lock assemblies in the above embodiment of the control panel. It will not be described in detail here.

Referring to <FIG>, in one embodiment of the present invention, the panel assembly 2comprises a first switch unit connected to the lock knob <NUM>. The first switch unit is adapted to control the lock shaft <NUM> locking or unlocking of the panel assembly <NUM> through operating the lock knob <NUM>.

During applying the present invention, the first switch unit comprises a self-propelled key <NUM> connected to the lock knob <NUM>.

During applying the present invention, the self-propelled key <NUM> is clamped with the lock knob <NUM>, and the lock knob <NUM> is driven to rotate by rotating the self-propelled key <NUM>.

During applying the present invention, the self-propelled key <NUM> can be implemented with reference to the description of the first switch unit in the above embodiment of the control panel. It will not be described in detail here.

Referring to <FIG>, in one embodiment of the present invention, the panel assembly <NUM> comprises a starting switch <NUM> being adapted to start or close the second motor <NUM> and a first starting unit. The first starting unit comprises a starting key <NUM> disposed on the panel assembly <NUM> and being moveable up and down, and a pull rod <NUM> movably connected to the panel assembly <NUM>.

When the starting key <NUM> moves to a bottom of the panel assembly <NUM>, the bottom of the starting key <NUM> will touch and start the starting switch <NUM> under a push of the bottom of the pull rod <NUM>, and the starting switch <NUM> will be closed when the bottom of the starting key <NUM> is disconnected from the starting switch <NUM>.

During applying the present invention, the pull rod <NUM> comprises a compression block <NUM> being adapted to push the starting key <NUM> to touch the starting switch <NUM> as the pull rod <NUM> rotating. A distance between the starting switch <NUM> and the compression block <NUM> is larger than the displacement distance of the compression block <NUM> caused by the rotation thereof.

During applying the present invention, the starting key <NUM> and the pull rod <NUM> can be implemented with reference to the description of the first starting unit in the above embodiment of the control panel. It will not be described in detail here.

Referring to <FIG>, in one embodiment of the present invention, the panel assembly <NUM> comprises a motor rotation switch <NUM> arranged in the panel assembly <NUM>. The motor rotation switch <NUM> is adapted to start or close the first motor.

A second starting unit is disposed on the panel assembly <NUM>. The second starting unit comprises a button unit <NUM>, a connecting assembly <NUM>, and an operating assembly <NUM>, wherein the button unit <NUM> moves downwards to press the connecting assembly <NUM> to make the connecting assembly <NUM> connected with the operating assembly <NUM>. The connecting assembly <NUM> is driven to move and press on the motor rotation switch <NUM> by moving the operating assembly <NUM>, in such a manner that the motor rotation switch <NUM> is triggered.

During applying the present invention, the button unit <NUM>, the connecting assembly <NUM>, and the operating assembly <NUM> can be implemented with reference to the description of the second starting unit in the above embodiment of the automatic switching device. It will not be described in detail here.

Referring to <FIG>, in one embodiment of the present invention, the panel assembly <NUM> comprises a sliding potentiometer <NUM> connected to the first motor <NUM>. The sliding potentiometer <NUM> comprises a potentiometer base <NUM> and a sliding needle <NUM> movably connected to the potentiometer base <NUM>. According to the moving distance of the sliding needle <NUM> on the potentiometer base <NUM>, the rotation speed of the first motor <NUM> is changed to adjust the self-propelling speed of the power device <NUM>.

During applying the present invention, the relative displacement distance between the panel assembly <NUM> and the guideway <NUM> is represented by S1 as the preset first distance, and the relative displacement distance between the panel assembly <NUM> and the guideway <NUM> is represented by S2 as the maximum distance. When the relative displacement distance between the panel assembly <NUM> and the guideway <NUM> is within [<NUM>, s1], it is called the front adjusting distance, and when the relative displacement distance between the panel assembly <NUM> and the guideway <NUM> is within [s1, s2], it is called the rear adjusting distance.

In one embodiment of the present invention, the acceleration of the sliding needle <NUM> as moving within the front adjusting distance is less than the acceleration of the sliding needle <NUM> as moving within the rear adjusting distance, in such a manner that avoiding the power device <NUM> moving too fast to cause danger as moving within the front adjusting distance. The safety can be further improved.

In one embodiment of the present invention, the potentiometer base <NUM> can be fixed on the panel assembly <NUM>, and one end of the sliding needle <NUM> can be fixed on the guideway <NUM>.

In one embodiment of the present invention, the potentiometer base <NUM> can be fixed on the guideway <NUM>, and one end of the sliding needle <NUM> is fixed on the panel assembly <NUM>.

In one embodiment of the present invention, the panel assembly <NUM> also can comprise a reset apparatus arranged between the two guideways <NUM> on both sides of the push rod <NUM>, and the reset apparatus is adapted to reset the location of the panel assembly <NUM>.

During applying the present invention, the reset apparatus comprises a reset rod <NUM> connected with the panel assembly <NUM> and the push rod <NUM>, and a reset rod return spring <NUM> sleeved on the reset rod <NUM>. One end of the reset rod return spring <NUM> is connected with the push rod <NUM>.

The reset rod <NUM> is driven to rotate around the push rod <NUM> by the movement of the panel assembly <NUM>, and the reset rod <NUM> is driven to rotate back by the reset rod return spring <NUM>, in such a manner that the panel assembly <NUM> moves back to its original position.

In one embodiment of the present invention, the reset rod <NUM> comprises a main rod 101a connected with the panel assembly <NUM> and a pair of auxiliary rods 101b arranged at both ends of the main rod 101a. The auxiliary rods <NUM> are connected with the push rod <NUM>.

During applying the present invention, the auxiliary rod 101b can be movably connected to the mounting hole in the push rod <NUM> and can rotate around the mounting hole. The main rod 101a can be clamped with the panel assembly <NUM>. When the panel assembly <NUM> moving, the reset rod <NUM> actively rotates around the push rod <NUM>, and the reset rod <NUM> is drive to rotate back by the reset rod return spring <NUM>, in such a manner that driving the panel assembly <NUM> move back to its original position.

During applying the present invention, the main rod 101a and the auxiliary rod 101b can be integrated into one. The main rod 101a can be cylindrical, and the cross section of the auxiliary rod 101b can be L-shaped.

During applying the present invention, both ends of the upper panel <NUM> and the lower panel <NUM> of the panel assembly <NUM> can be movably connected to the guideway <NUM>.

During applying the present invention, a chuck <NUM> can be arranged on the lower panel <NUM> of the panel assembly <NUM>, and the reset rod <NUM> can be partially fitted and installed in the chuck <NUM>.

During applying the present invention, a chuck <NUM> can be arranged on the upper panel <NUM> of the panel assembly <NUM>, and the reset rod <NUM> can be partially fitted and installed in the chuck <NUM>.

In one embodiment of the present invention, the power device <NUM> can be garden tools.

During applying the present invention, the garden tool can be a lawn mower as shown in <FIG>, or a snow sweeper, a soil loosener, a lawn harrower or any other kinds of wheeled driving device.

Taking the power device <NUM> as a lawn mower as an example, the working principle of the lawn mower is described in detail as follows:.

During applying the present invention, the lawn mower usually comprises a first motor for providing self-propelled power and a second motor for providing the working power for the equipment. The first motor and the second motor are usually driven independently.

Referring to <FIG> and <FIG>, in one embodiment of the present invention, the driving process of the second motor is described as follows:.

Step <NUM>, start the starting unit of the second motor.

During applying the present invention, the starting unit of the second motor can be the first starting unit in the above-mentioned embodiment, or it can be the second starting unit in the above-mentioned embodiment. That is, no limitation is required.

Taking the starting unit of the second motor as the second starting unit as an example, the hanging plate can be operated to clamp with the pulling plate by pressing the button assembly, in such a manner that starting the starting unit of the second motor.

During applying the present invention, the motor rotation switch can be triggered by starting the pull rod and then the sliding plate is driven to move on the panel assembly by the hanging plate driven by the pulling plate.

During applying the present invention, the second motor can be triggered to start working by operating the motor rotation switch. As the second motor is started, the lawn mower can perform mowing work.

It is to be understood, during applying the present invention, according to the driving state of the first motor, the driving mode of the lawn mower can be determined. In other words, the lawn mower that the second motor has started, either work in manual-power driving mode, or work in constant speed self-propelled driving mode or in variable speed self-propelled driving mode.

Referring to <FIG>, in one embodiment of the present invention, the driving process of the first motor is described as follows:.

Step <NUM>, verify the state of the lock knob.

If the lock knob is not turned on, execute step <NUM>, otherwise step <NUM> is executed.

Step <NUM>, the lawn mower works under the manual-power driving mode.

When the lock knob is not turned on, the self-propelled safety is not turned on. The self-propelled key knob points to the right <NUM>°in front of the panel assembly, and the lock shafts on the left and right are inserted into the holes of the push rod. At this moment, the whole panel assembly cannot slide along the push rod. The first motor is in the closed state. And the lawn mower works in the manual-power driving mode.

Step <NUM>, the lawn mower works under the self-propelled driving mode.

During applying the present invention, the self-propelled key can be driven to separate from the positioning holes by the operator pressing down the self-propelled key knob. The buckle body on the bottom of the self-propelled key can be driven to engage in the buckle slot of the lock knob by rotating the self-propelled key knob. At this moment, the self-propelled key is driven to rotate by continually rotating of the self-propelled key knob, in such a manner that the self-propelled key knob is rotating, the lock shafts connected with the self-propelled key knob are driven to compress and separate from the push rod by rotating the self-propelled key knob. At this moment, the panel assembly is unlocked and can freely slide on the push rod.

When releasing the self-propelled key knob, the self-propelled key is ejected from the lock knob under the action of the key reset spring. The self-propelled key is inserted into the corresponding positioning holes of the self-propelled key through the positioning columns, and enters in the self-propelled driving mode.

Step <NUM>, determine the self-propelled speed based on the location of the sliding potentiometer.

During applying the present invention, the panel assembly is driven to slide forward along the guideway on the push rod through the operator pushing the panel assembly, in such a manner that, the reset rod being driven to rotate forward by the sliding of the panel assembly. When the external force stops pushing the panel assembly, the reset rod will rotate backward under the action of torsional spring force. At this moment, the reset rod the panel assembly can be driven to slide backward along the guideway to the original position.

When the panel assembly moves on the guideway, the sliding needle of the sliding potentiometer is driven to slide on the potentiometer base by the movement of the panel assembly, and producing relative displacement. According to the moving distance of the sliding needle on the potentiometer base, the first motor determines the self-propelled speed of the lawn mower. The larger the moving distance of the panel assembly on the guideway, the larger the stroke of the sliding potentiometer, and the faster the self-propelled speed of the lawn mower.

When the first motor needs to be shut down, the panel assembly is reset. Then the left lock shaft on the lock knob is inserted into the push rod by turning the self-propelled key. Then the self-propelled key returns to its original position by releasing the self-propelled key knob. The first motor is closed.

Step <NUM>, judge the self-propelled switch state.

When the self-propelled switch is off, step <NUM> is executed. Otherwise, step <NUM> is executed.

Step <NUM>, determine whether the panel assembly is locked.

When the panel assembly is locked, step <NUM> is executed. Otherwise, step <NUM> is executed.

Step <NUM>, the lawn mower is in a constant speed self-propelled driving mode.

At this moment, according to the different positions of the panel assembly fixed on the push rod, the self-propelled speed can be determined. And in such a manner that the device working in constant speed self-propelled driving mode.

Step <NUM>, the lawn mower is in a variable speed self-propelled driving mode.

When the panel assembly is unlocked, the lawn mower is in a variable speed self-propelled driving mode.

Claim 1:
A power device (<NUM>), comprising:
a machine body;
a housing (<NUM>), a first motor (<NUM>) and a second motor (<NUM>) located in the housing (<NUM>), the first motor (<NUM>) is adapted to provide self-propelled power, and the second motor (<NUM>) is adapted to provide working power for the power device (<NUM>); and
a control panel, the control panel including:
a pushing rod (<NUM>) connected to the machine body,
a panel assembly (<NUM>) reciprocatingly sliding on the pushing rod (<NUM>); and
a sliding potentiometer (<NUM>) connected to the first motor (<NUM>);
wherein the sliding potentiometer (<NUM>) comprises a potentiometer base (<NUM>) and
a sliding needle (<NUM>) movably connected to the potentiometer base (<NUM>), and
wherein the first motor (<NUM>) is configured to adjust the rotation speed to adjust the self-propelling speed of the power device (<NUM>) according to the moving distance of the sliding needle (<NUM>) on the potentiometer base (<NUM>) , wherein the control panel comprises a guideway (<NUM>) fixed on the pushing rod (<NUM>), and the panel assembly (<NUM>) sliding along the guideway (<NUM>), characterized in that the acceleration of the sliding needle (<NUM>) as moving within [<NUM>, s1] is less than the acceleration of the sliding needle (<NUM>) as moving within [s1, s2], wherein S1 represents a relative displacement distance between the panel assembly (<NUM>) and
the guideway (<NUM>) as a preset first distance, and S2 represents a relative displacement distance between the panel assembly (<NUM>) and the guideway (<NUM>) as a maximum distance.