WO2020088195A1 - Faucheuse - Google Patents

Faucheuse Download PDF

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Publication number
WO2020088195A1
WO2020088195A1 PCT/CN2019/109909 CN2019109909W WO2020088195A1 WO 2020088195 A1 WO2020088195 A1 WO 2020088195A1 CN 2019109909 W CN2019109909 W CN 2019109909W WO 2020088195 A1 WO2020088195 A1 WO 2020088195A1
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WO
WIPO (PCT)
Prior art keywords
grip
handle assembly
sensor
coupled
output signal
Prior art date
Application number
PCT/CN2019/109909
Other languages
English (en)
Inventor
Denis Gaston Fauteux
Hei Man Raymond LEE
Ngai CHEUNG
Dohoon Kim
Original Assignee
Tti (Macao Commercial Offshore) Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tti (Macao Commercial Offshore) Limited filed Critical Tti (Macao Commercial Offshore) Limited
Publication of WO2020088195A1 publication Critical patent/WO2020088195A1/fr

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Classifications

    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01D—HARVESTING; MOWING
    • A01D34/00—Mowers; Mowing apparatus of harvesters
    • A01D34/01—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus
    • A01D34/412—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters
    • A01D34/63—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters having cutters rotating about a vertical axis
    • A01D34/67—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters having cutters rotating about a vertical axis hand-guided by a walking operator
    • A01D34/68—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters having cutters rotating about a vertical axis hand-guided by a walking operator with motor driven cutters or wheels
    • A01D34/69—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters having cutters rotating about a vertical axis hand-guided by a walking operator with motor driven cutters or wheels with motor driven wheels
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01D—HARVESTING; MOWING
    • A01D34/00—Mowers; Mowing apparatus of harvesters
    • A01D34/01—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus
    • A01D34/412—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters
    • A01D34/63—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters having cutters rotating about a vertical axis
    • A01D34/82—Other details
    • A01D34/824—Handle arrangements
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01D—HARVESTING; MOWING
    • A01D34/00—Mowers; Mowing apparatus of harvesters
    • A01D34/01—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus
    • A01D34/412—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters
    • A01D34/63—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters having cutters rotating about a vertical axis
    • A01D34/67—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters having cutters rotating about a vertical axis hand-guided by a walking operator
    • A01D34/68—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters having cutters rotating about a vertical axis hand-guided by a walking operator with motor driven cutters or wheels
    • A01D2034/6843—Control levers on the handle of the mower

Definitions

  • the present invention relates to a mower. More particularly but not exclusively, the present invention relates to a mower having a speed control system.
  • Mowers such as walk-behind lawn mowers are commonly used to perform mowing operations. Usually, to operate these devices, the user has to activate the motor of the cutting blade then push the mower along the lawn to cut grass using the cutting blade. Problematically to the user, continuously operating these devices for a long period of time and/or in sloped terrain can be tiring.
  • An aspect of the present invention has an aim to provide a mower which is drivable to move at a ground travel speed that matches a user’s walking pace.
  • a mower comprising:
  • a sensor comprising a linear encoder, the linear encoder is operable to generate an output signal indicative of a position of the grip relative to the handle assembly;
  • a controller coupled to the sensor and the drive assembly
  • the controller is configured to receive the output signal and control the drive assembly according to the output signal.
  • the linear encoder comprises an electromagnetic sensor and an optical feature
  • the electromagnetic sensor is at least partially coupled to one of the grip and the handle assembly, and
  • the optical feature is coupled to the other of the grip and the handle assembly.
  • the electromagnetic sensor comprises a camera.
  • the optical feature is printed on a surface of the other of the grip and the handle assembly.
  • the optical feature comprises a scale.
  • the scale comprises a reference mark which indicates a reference position of the grip relative to the handle assembly.
  • the reference mark is encoded with information indicative of the reference position.
  • the senor is configured to generate an output signal indicative of the reference position, in response to the electromagnetic sensor detecting at least a portion of the reference mark.
  • the scale comprises distance coded reference marks.
  • the distance coded reference marks are separated from one another by a predetermined set of spacings which are indicative of positions of the grip relative to the handle assembly.
  • the scale comprises a pattern formed by at least two types of optical features.
  • the electromagnetic sensor is at least partially coupled to the grip, and the optical feature is coupled to the handle assembly.
  • a mower comprising:
  • a sensor comprising a rotary encoder, the rotary encoder is operable to generate an output signal indicative of a position of the grip relative to the handle assembly;
  • a controller coupled to the sensor and the drive assembly
  • the controller is configured to receive the output signal and control the drive assembly according to the output signal.
  • the senor further comprises a rotatable shaft and a motion conversion assembly which is configured to convert a linear motion of the grip relative to the handle assembly to a rotational motion of the rotatable shaft.
  • the rotary encoder is configured to detect an angular movement of the rotatable shaft.
  • the motion conversion assembly comprises a flexible tension member having a first end coupled to the grip and a second end coupled to the rotatable shaft.
  • the flexible tension member comprises at least one of a cord, a belt, a tape and a wire.
  • the senor further comprises a driving mechanism for driving the shaft so as to maintain a predetermined tension within the flexible tension member.
  • the driving mechanism comprises a spring.
  • the driving mechanism comprises a motor.
  • the driving mechanism further comprises a controller which is configured to detect a tension on the flexible tension member and to control an operation of the motor based upon the detected tension.
  • a mower comprising:
  • an accelerometer coupled to the grip and operable to generate an output signal indicative of a movement of the grip relative to the handle assembly
  • a controller coupled to the sensor and the drive assembly
  • the controller is configured to receive the output signal and control the drive assembly according to the output signal.
  • the controller is configured to process the output signal to generate a control signal and configured to control the drive assembly based upon the control signal.
  • control signal comprises information indicative of a magnitude of an acceleration of the grip.
  • control signal comprises information indicative of a direction of an acceleration of the grip
  • control signal comprises information indicative of a speed of movement of the grip.
  • a mower comprising:
  • a sensor comprising a first sensing unit coupled to the grip and a second sensing unit coupled to the handle assembly, the first sensing unit and the second sensing unit are spaced apart from each other along a longitudinal axis of the handle assembly, the sensor is operable to generate an output signal indicative of a distance between the first sensing unit and the second sensing unit along the longitudinal axis;
  • a controller coupled to the sensor and the drive assembly
  • the controller is configured to receive the output signal and control the drive assembly according to the output signal.
  • the mower further comprises a biasing member coupled to the grip, the biasing member is configured to apply a force urging the grip to move away from the handle assembly.
  • the biasing member is configured to generate a biasing force which is aligned along the longitudinal axis.
  • the biasing member has a first end coupled to the grip and a second end coupled to the handle assembly.
  • the biasing member comprises a compression spring.
  • the handle assembly comprises an arm, and a housing coupled to an end of the grip and the arm.
  • the second sensing unit is coupled to the arm.
  • the senor is positioned within the housing.
  • the biasing member is at least partially positioned within the housing.
  • the first sensing unit comprises one of a magnet and a hall effect sensor
  • the second sensing unit comprises the other of the magnet and the hall effect sensor
  • the first sensing unit comprises one of a laser sensor and a reflector
  • the second sensing unit comprises the other of the laser sensor and the reflector
  • the first sensing unit comprises one of a linear charge-coupled device and an image pattern
  • the second sensing unit comprises the other of the linear charge-coupled device and the image pattern
  • the image pattern comprises a QR pixel.
  • the first sensing unit comprises one of a light emitting diode and a light intensity sensor
  • the second sensing unit comprises the other of the light emitting diode and the light intensity sensor
  • the first sensing unit comprises one of an infrared transmitter and an infrared receiver
  • the second sensing unit comprises the other of the infrared transmitter and the infrared receiver
  • a mower comprising:
  • a sensor comprising a potentiometer
  • the potentiometer comprises a resistive element coupled to one of the grip and the handle assembly and a sliding contact coupled to the other of the grip and the handle assembly, the sensor is operable to generate an output signal indicative of a position of the grip relative to the handle assembly;
  • a controller coupled to the sensor and the drive assembly
  • the controller is configured to receive the output signal and control the drive assembly according to the output signal.
  • the resistive element is aligned along a longitudinal axis of the one of the grip and the handle assembly.
  • the senor is operable to generate the output signal by sensing a resistance between the sliding contact and an end of the resistive element.
  • the resistive element is coupled to the handle assembly and the sliding contact is coupled to the grip.
  • a mower comprising:
  • the grip moveable relative to the handle assembly along a longitudinal axis of the handle assembly, the grip comprises a gripping portion which is oriented substantially perpendicular to the longitudinal axis;
  • a force sensor attached to the gripping portion and being operable to generate an output signal indicative of an amount of force applied to the gripping portion by a user
  • a controller coupled to the sensor and the drive assembly
  • the controller is configured to receive the output signal and control the drive assembly according to the output signal.
  • the force sensor is positioned inside the gripping portion.
  • the force sensor is at least partially covered by a resiliently flexible material.
  • the material comprises soft plastics.
  • the force sensor is only sensitive to a force applied along a predetermined direction.
  • the predetermined direction is along the longitudinal axis.
  • a mower comprising:
  • a biasing member coupled at one end to the grip and coupled at the other end to the force sensor
  • a controller coupled to the sensor and the drive assembly
  • the controller is configured to receive an output signal of the force sensor and control the drive assembly according to the output signal.
  • the biasing member is configured to apply a force urging the grip to move away from the handle assembly.
  • the biasing member is configured to generate a biasing force which is aligned along a longitudinal axis of the handle assembly.
  • the biasing member is at least partially positioned within the handle assembly.
  • the biasing member comprises a compression spring.
  • the controller is configured to activate the drive assembly in response to detecting that the magnitude of the output signal is higher than a threshold value.
  • a mower comprising:
  • a sensor comprising an electrode coupled to one of the grip and the handle assembly and a plurality of electrical contacts coupled to the other of the grip and the handle assembly, the sensor is operable to generate an output signal indicative of a position of the grip relative to the handle assembly;
  • a controller coupled to the sensor and the drive assembly
  • the controller is configured to receive the output signal and control the drive assembly according to the output signal.
  • the sensor is configured to detect an electrical connection between the electrode and one of the plurality of electrical contacts.
  • the output signal is indicative of an identity of one of the plurality of electrical contacts which is in electrical connection with the electrode.
  • the electrode comprises a flat metal plate.
  • the plurality of electrical contacts are spaced apart from one another along a longitudinal axis of the other of the grip and the handle assembly.
  • the electrode is coupled to the grip, and the plurality of electrical contacts are coupled to the handle assembly.
  • the plurality of electrical contacts are positioned within the handle assembly.
  • Figure 1 is a perspective view of a lawn mower including a speed control assembly.
  • Figure 2 is a partial section view of the lawn mower of Figure 1 taken along the line 2-2 shown in Figure 1.
  • Figure 3 is a front view of the lawn mower and the speed control assembly according to a first embodiment of the present invention.
  • Figure 4 is a front view of the lawn mower and the speed control assembly according to a second embodiment of the present invention.
  • Figure 5 is a front view of the lawn mower and the speed control assembly according to a third embodiment of the present invention.
  • Figure 6 is a front view of the lawn mower and the speed control assembly according to a fourth embodiment of the present invention.
  • Figure 7 is a front view of the lawn mower and the speed control assembly according to a fifth embodiment of the present invention.
  • Figure 8 is a front view of the lawn mower and the speed control assembly according to a sixth embodiment of the present invention.
  • Figure 9 is a front view of the lawn mower and the speed control assembly according to a seventh embodiment of the present invention.
  • Figure 10 is a front view of the lawn mower and the speed control assembly according to an eighth embodiment of the present invention.
  • FIGS 1 and 2 illustrate a lawn mower 10 including a handle assembly 14 pivotally coupled to a main body 18 that supports a drive system assembly 22 ( Figure 2) .
  • the drive system 22 includes, for example, an electric motor 24 powered by a battery pack 80 received within the main body 18.
  • the motor 24 drives a set of wheels 26, which support the main body 18 for movement over a surface.
  • the rear wheels 26 are driven by the drive system 22, but alternative embodiments include both the front and the rear wheels being driven by the drive system 22.
  • a transmission is coupled to the motor 24 to reduce the rotational speed from the motor 24 and to transfer the motor torque to the wheels 26.
  • the mower 10 further includes a cutting element 28 rotationally supported on a mower deck 20 positioned beneath the main body 18. The cutting element 28 is ultimately driven by the motor 24.
  • the cutting element 28 may be driven by a motor separate from the motor that drives the wheels 26.
  • the drive system assembly 22 includes a controller 70 (e.g., a drive system controller, motor controller, etc. ) with memory 74 and a processor 78.
  • the memory 74 of the controller 70 stores software setting forth operational parameters for the drive system assembly 22.
  • the mower 10 also includes a speed control assembly 30 that controls the operation of the drive system 22. More specifically, the speed control assembly 30 automatically controls the ground travel speed of the lawn mower 10 based on a user’s walking pace.
  • the handle assembly 14 is pivotally coupled to the main body 18 such that the handle assembly 14 may be rotated between discrete positions relative to the main body 18.
  • the handle assembly 14 includes a pair of lower arms 35 and a pair of upper arms 32.
  • the upper arms 32 include a first upper arm 33 operable to translate along a first longitudinal axis 433 and a second upper arm 34 operable to translate along a second longitudinal axis 434.
  • the first longitudinal axis 433 is parallel to the second longitudinal axis 434.
  • the handle assembly 14 further includes a cross member 62 that extends transversely between the first upper arm 33 and the second upper arm 34 to, among other things, provide lateral support for the handle assembly 14.
  • the cross member 62 is integral with the upper arms 32 at an upper end 33a of the first upper arm 33 and integral with an upper end 34a of the second upper arm 34.
  • a first corner 63 is formed at the connection of the first upper arm 33 and the cross member 62
  • a second corner 64 is formed at the connection of the second upper arm 34 and the cross member 62.
  • the cross member 62 is removably coupled to the pair of upper arms 32.
  • the pair of upper arms 32 are telescopically received by the pair of lower arms 35 through a first adjustment connector 44 and a second adjustment connector 45. In other words, the distance the upper arms 32 extend away from lower arms 35 is adjustable by a user via the connectors 44, 45.
  • the pair of lower arms 35 includes a first lower arm 36 and a second lower arm 37.
  • the first lower arm 36 is coupled to a first offset arm handle member 39
  • the second lower arm 37 is coupled to a second offset arm handle member 40.
  • the first offset arm 39 is pivotally coupled to a first bracket 41 of the mower deck 20 about a first handle pivot axis 441.
  • the second offset arm 40 is pivotally coupled to a second bracket 42 of the mower deck 20 about a second handle pivot axis 442.
  • the handle assembly 14 also includes a locking mechanism 38 coupled to the pair of lower arms 35 to releasably retain the handle assembly 14 at various pivoted positions relative to the main body 18.
  • the locking mechanism 38 is operable to secure the handle assembly 14 in various positions (e.g., a storage position, a vertical position, a small-angle position, a large-angle position, etc. ) relative to the main body 18.
  • the speed control assembly 30 includes a U-shaped grip 46 with a gripping portion 50 and a pair of grip legs 54, including a first grip leg 55 and a second grip leg 56.
  • the gripping portion 50 is oriented substantially parallel to the cross member 62, and the gripping portion 50 extends the entire width of the cross member 62.
  • the first grip leg 55 is slidably coupled to the first upper arm 33, and the second grip leg 56 is slidably coupled to the second upper arm 34.
  • a bail control 57 is also positioned on the grip 46.
  • the speed control assembly 30 further includes a first housing 60 and a second housing 61.
  • Both the first housing 60 and the second housing 61 are formed as clam-shell housings that partially enclose the grip 46 and the handle assembly 14, and both housings 60, 61 are coupled to the cross member 62.
  • the first grip leg 55 is partially received by the first housing 60
  • the second grip leg 56 is partially received by the second housing 61.
  • the first housing 60 is coupled to the first corner 63 of the handle assembly 14 and the second housing 61 is coupled to the second corner 64 of the handle assembly 14.
  • the U-shaped grip 46 is partially received within both the first housing 60 and the second housing 61.
  • the first grip leg 55 is received within a hollow portion of the first housing 60, such that the grip 46 is linearly displaceable (e.g., slidable) along the first longitudinal axis 433 relative to the first housing 60.
  • the second grip leg 56 is received within a hollow portion of the second housing 61 such that the grip 46 is linearly displaceable along the second longitudinal axis 434 relative to the second housing 61.
  • the upper arms 32 are not allowed to move relative to the housings 60, 61 along the respective longitudinal axes 433, 434 in use. Therefore, the housings 60, 61 may be considered to be part of the handle assembly 14 rather than being a part of the speed control assembly 30. Accordingly, it will be understood that the legs 54 of the grip 46 are linearly displaceable relative to the handle assembly 14 (in particular, the upper arms 32) .
  • the lower ends of the legs 54 of the grip 46 may be spaced apart from the upper ends of the upper arms 32 along the longitudinal axes 433, 434.
  • the legs 54 of the grip 46 may be telescopically coupled to the upper arms 32.
  • the grip legs 54 may be received within a hollow portion of the respective upper arms 32 (or vice versa) while the grip 46 remains linearly displaceable relative to the pair of upper arms 32.
  • a biasing member (not shown) is typically provided to bias the grip 46 along the longitudinal axes 433, 434.
  • the biasing member may be positioned between the grip 46 (in particular, the legs 54) and the handle assembly 14 (in particular, the housings 60, 61 or the upper arms 32) in any suitable manner. More specifically, the biasing member may be positioned within the housings 60, 61 and may take the form of linear spring element (s) . In general, the biasing member acts upon the grip 46, to urge the grip 46 away from the handle assembly 14, toward an extended, first position (in which the grip 46 is shown in solid lines in Figure 3) .
  • the biasing member is not compressed and the grip 46 is positioned at a first length L1 measured from the gripping portion 50 to the cross member 62.
  • the grip 46 is movable toward the handle assembly 14, against the bias of the biasing member by a distance D1, to a compressed, second position (in which the grip 46 is shown in dashed lines in Figure 3) .
  • the biasing member is fully compressed, and the grip 46 is disposed at a second length L2 measured from the griping portion 50 to the cross member 62.
  • the speed control assembly 30 further includes a sensor 90 positioned within the first housing 60 for detecting and/or measuring the displacement of the grip 46 relative to the handle assembly 14.
  • the sensor 90 is a linear encoder, in particular, a linear optical encoder.
  • the sensor 90 includes an electromagnetic (EM) radiation detector 91 coupled to the lower end 55a of the leg 55, and an optical feature 92 printed on an inner surface of the housing 60.
  • the EM radiation detector 91 is a camera.
  • the camera has a lens (not shown) facing the optical feature 92, and is electrically connected to the controller 70.
  • the camera may be a narrow angle camera.
  • the EM radiation detector 91 may take other suitable forms and is not limited to a camera.
  • the lower end 55a and the sensor 90 are shown in dashed lines. This is to reflect that those features are disposed within the housing 60 and are not visible in the front view as shown in Figure 3. Similar representations are used in Figures 4 to 10 as described below.
  • the sensor 90 may also include an EM radiation emitter (not shown) which emits radiation towards the optical feature 92.
  • the EM radiation emitter may be provided at any suitable locations as long as it is able to emit radiation which enables the EM radiator detector 91 to detect the optical feature 92.
  • the EM radiator detector 91 and the EM radiation emitter collectively form an EM sensor.
  • the EM radiation emitter may be a light source such as an LED or an LED array.
  • the EM radiation emitter may be omitted if for example natural light is able to reach the optical feature 92 through the housing 60 (e.g., if the housing 60 is made of an opaque or transparent material) .
  • the optical feature 92 comprises information which is discernible by the EM radiation detector 91.
  • the optical feature 92 comprises a scale.
  • the scale is provided with reference marks which are encoded with information indicative of respective reference positions of the grip 46 relative to the handle assembly 14.
  • the reference marks are spaced apart from one another along the longitudinal axis 433.
  • the reference marks may include codes formed by a combination of letter (s) and/or number (s) , or may be colour coded.
  • the corresponding relationship between the reference marks and the reference positions is predetermined and information indicating the corresponding relationship may be stored in the memory 74 of the controller 70 or in the sensor 90.
  • the controller 70 is able to determine, based upon an output signal (e.g., image data) of the EM radiation detector 91, that the leg 55 has reached a particular position corresponding to that code relative to the handle assembly 14.
  • the scale of the optical feature 92 is provided with distance coded reference marks. The distance coded reference marks are separated from one another along the longitudinal axis 433 by a predetermined set of spacings which are indicative of positions of the grip relative to the handle assembly.
  • the scale may be provided with a pattern formed by at least two types (e.g., two different colours) of optical features.
  • the different types of optical features are interleaved along the longitudinal axis 433, and each optical feature has a predetermined length along the longitudinal axis 433.
  • the EM radiation detector 91 generates an output signal when the EM radiation detector 91 is moved relative to the optical feature 92.
  • the controller 70 further processes the output signal by counting the number of optical features moving past the EM radiation detector 91 during the movement of the grip 46 relative to the handle assembly 14. Therefore, the controller 70 is able to determine a position of the grip 46 relative to the handle assembly 14 based upon the output signal of the EM radiation detector 91 and an initial position of the grip 46 (e.g., the first position of the grip 46) .
  • optical feature 92 may take any suitable form, which is not limited to the examples described above, as long as the EM radiation detector is able to output a signal indicative of a position of the grip 46 relative to the handle assembly 14 by detecting the optical feature 92.
  • the sensor 90 is electrically connected to the controller 70. More specifically, the sensor 90 generates an electrical output signal that is received by the controller 70.
  • the output signal includes information indicative of a position of the grip 46 relative to the handle assembly 14.
  • the output signal is image data captured by the EM radiation detector 91, and the controller 70 may further process the image data to generate a control signal indicating a position of the grip 46 relative to the handle assembly 14.
  • the sensor 90 further includes a processing unit which processes the image data captured by the EM radiation detector 91 to generate the control signal, and the control signal is provided as an output signal by the sensor 90 to the controller 70.
  • the memory 74 of the controller 70 stores software setting forth operational parameters for the drive system 22.
  • the processor 78 of the controller 70 executes the software to control the function of the drive system 22 (e.g., a speed and/or a direction at which the drive system 22 drives the wheels 26) based on the control signal.
  • the control signal is generated by either the controller 70 or the sensor 90 by measuring a change in the image data over time, and is then used as an input to alter the speed and/or direction at which the drive system 22 drives the wheels 26.
  • the image data captured by the EM radiation detector 91 varies with movement of the grip 46 relative to the cross member 62. Therefore, the generated control signal comprises information indicative of the magnitude of displacement of the grip 46 relative to the cross member 62, or other suitable portion of the handle assembly 14.
  • the EM radiation detector 91 moves with respect to the optical feature 92 and the sensor 90 generates an output signal accordingly.
  • the output signal of the sensor 90 is used by the controller 70 to measure the displacement of the grip 46 against the biasing member (not shown) in order to gauge the user’s desired speed.
  • the output signal from the sensor 90 is received and processed by the drive system controller 70 and the controller 70 drives the motor 24 to drive the wheels 26 at a corresponding speed.
  • An increase of force exerted on the grip 46 by the user results in further compression of the biasing member and further movement of the EM radiation detector 91 with respect to the optical feature 92. Such an increase in translation would alter the output signal from the sensor 90 to request an increase of power to the electric motor 24 and a greater speed of the mower 10.
  • the sensor 90 detects the displacement of the grip 46 and generates an output signal indicative of the position of the grip 46 relative to the handle assembly 14. Based upon the output signal of the sensor 90, the drive system 22 may drive the wheels 26 at a variable speed that is proportional to the percentage of the full actuation distance D1 that the grip 46 has been displaced. For example, if the grip 46 is moved halfway between the first position and the second position, the drive system 22 drives the wheels 26 at half of the predetermined speed. In this way, the speed at which the wheels 26 are driven by the drive system 22 is determined by the position of the grip 46 relative to the handle assembly 14, which in turn is determined by the compression of the grip 46 against the biasing member by a user of the mower 10.
  • the ground travel speed of the lawn mower 10 is determined by the amount of compression that results from the user’s pushing the grip 46 as the user is walking.
  • the forward movement of the lawn mower 10 further reduces the amount of compression that results from the user’s pushing the grip 46 as the user is walking.
  • the controller 70 ultimately actuates the drive system 22 to drive the wheels 26 at a speed that matches the user’s walking pace, by using the output signal of the sensor 90.
  • the EM radiation detector 91 is coupled to the housing 60 and the optical feature 92 is coupled to the lower end 55a of the leg 55.
  • the optical feature 92 may be coupled to the inner surface of the housing 60 in a different manner (such as, gluing) .
  • the optical feature 92 may be coupled to an inner surface of the upper arm 33 instead of the housing 60.
  • the speed control assembly 30 includes a sensor 190 in accordance with a second embodiment of the invention for detecting and/or measuring the displacement of the grip 46 relative to the handle assembly 14.
  • the sensor 190 includes a rotatable shaft 192 and a body 193 for coupling the rotatable shaft 192 to the first housing 60.
  • the body 193 also contains driving mechanism (not shown) for driving the shaft 192 to rotate.
  • the sensor 190 further includes a flexible tension member 191 which has a first end coupled to a lower end 55a of the leg 55 and a second end coupled to the shaft 192, and a rotary encoder 194 for detecting an angular movement of the shaft 192.
  • the flexible tension member 191 is a flexible structural element that is subjected to an axial tensile force.
  • the flexible tension member 191 may comprise a cord, a wire, a belt, a chain etc. A length of the flexible tension member 191 is wound around the shaft 192, so that the shaft rotates as the flexible tension member 191 is pulled.
  • the drive mechanism contained within the body 193 drives the shaft 192 to take up any slack of the flexible tension member 191 between the shaft 192 and the leg 55, such that the flexible tension member 191 is maintained tight and straight along the longitudinal axis 433.
  • the lower end 55a of the leg 55 is moved towards the shaft 192 along the longitudinal axis 433 and the flexible tension member 191 becomes slack.
  • the drive mechanism contained within the body 193 rotates the shaft 192 to take up the slack of the flexible tension member 191, and meanwhile the rotary encoder 194 detects the angular movement of the shaft 192 and generates an output signal indicative of the angular movement of the shaft 192.
  • a distance of the displacement of the grip 46 is substantially equal to the length of the flexible tension member 191 to be taken up by the shaft 192, which in turn determines the angular movement of the shaft 192. Therefore, by detecting the angular movement of the shaft 192, the rotary encoder 194 is able to generate an output signal which is indicative of the position of the grip 46 relative to the handle assembly 14.
  • the tension on the flexible tension member 191 increases beyond its normal level. The increasing tension causes the shaft 192 to rotate so as to unwind a portion of the flexible tension member 191 from the shaft 192, until the tension on the flexible tension member 191 is reduced to its normal level.
  • the rotary encoder 194 detects the angular movement of the shaft 192 in this process and generates an output signal which is indicative of the position of the grip 46 relative to the handle assembly 14.
  • the drive mechanism contained within the body 193 may be a spring coil which constantly applies a biasing force urging the shaft 192 to wind up the flexible tension member 191.
  • the biasing force also keeps continuous tension on the flexible tension member 191.
  • the drive mechanism contained within the body 193 may include a motor and a controller for controlling an operation of the motor.
  • the controller detects the tension on the flexible tension member 191 and drives the motor to take up the flexible tension member 191 if the tension is below a certain value and to release the flexible tension member 191 if the tension is beyond the certain value.
  • the flexible tension member 191 is kept tight and straight along the longitudinal axis 433, and the tension on the flexible tension member 191 is maintained at an acceptable level.
  • the drive mechanism and the flexible tension member 191 collectively form a motion conversion assembly which converts a linear motion of the grip 46 relative to the handle assembly 14 to a rotational motion of the rotatable shaft 191.
  • the motion conversion assembly may take other suitable forms, such as, for example, a rack and a pinion.
  • the rotary encoder 194 may be of any suitable type, which includes but not limited to, an optical rotary encoder, a magnetic rotary encoder, a mechanical rotary encoder, etc.
  • the sensor 190 cooperates with the drive system assembly 22 in a similar way to the sensor 90 as described above.
  • the output signal of the rotary encoder 194 of the sensor 190 is provided to the controller 70, and accordingly the controller 70 drives the wheels 26 at a variable speed that is proportional to the distance of the displacement of the grip 46 relative to the handle assembly. In this way, the wheels 26 are driven at a speed that matches the user’s walking pace.
  • the body 193, the shaft 192 and the rotary encoder 194 may be attached to the upper arm 33 instead of the housing 60.
  • the speed control assembly 30 includes a sensor 290 in accordance with a third embodiment of the invention for detecting and/or measuring the displacement of the grip 46 relative to the handle assembly 14.
  • the sensor 290 is an accelerometer and is attached to the grip 46.When a user pushes the grip 46 towards the handle assembly 14 along the longitudinal axis 433, the accelerometer 290 measures the acceleration of the grip 46 and generates an output signal (for example, an analog/digital voltage signal) indicative of the acceleration of the grip 46.
  • the output signal may have a magnitude which is proportional to the acceleration of the grip 46.
  • the output signal may comprise pulse-width modulation (PWM) square waves with a known period, but a duty cycle that varies with changes in acceleration.
  • PWM pulse-width modulation
  • the controller 70 may process the output signal of the accelerometer 290 to generate a control signal and may drive the motor 24 to drive the wheels 26 at a speed in accordance with the control signal.
  • the control signal may comprise information indicative of a magnitude (and optionally a direction) of the acceleration of the grip 46.
  • the wheels 26 may be driven at a greater speed if the control signal indicates greater acceleration of the grip 46.
  • the speed of the wheels 26 may be proportional to the magnitude of the acceleration of the grip 46.
  • the controller 70 may activate the motor 24 to drive the wheels 26 only if the controller 70 detects that the magnitude of the acceleration of the grip 46 is higher than a threshold value.
  • the threshold value may be set to reduce the interference of noise.
  • the controller 70 may activate the motor 24 to drive the wheels 26 only if the controller 70 detects that the direction of the acceleration of the grip 46 is in a particular direction (e.g., along the longitudinal axis 433 towards the handle assembly 14) .
  • control signal may comprise information indicative of a speed of movement of the grip 46, which is generated by the controller 70 based upon the acceleration of the grip 46 indicated by the output signal of the accelerometer 290 and a time period during which the acceleration occurs.
  • the wheels 26 may be driven at a greater speed if the control signal indicates a greater speed of movement of the grip 46.
  • the speed of the wheels 26 may be proportional to the speed of movement of the grip 46.
  • an increase of force exerted on the grip 46 by the user results in greater acceleration of the grip 46 or greater speed of movement of the grip 46, thereby resulting in the controller 70 requesting an increase of power to the electric motor 24 to drive the wheels 26 of the mower 10 at a greater speed.
  • the speed control assembly 30 includes a sensor 390 in accordance with a fourth embodiment of the invention for detecting and/or measuring the displacement of the grip 46 relative to the handle assembly 14.
  • a lower end 55a of the leg 55 is spaced apart from an upper end 33a of the upper arm 33 along the longitudinal axis 433.
  • Each of the leg 55 and the upper arm 33 is partially disposed within the housing 60.
  • the biasing member described above which biases the grip 46 along the longitudinal axes 433, 434 is shown as a biasing member 84 in this embodiment.
  • the biasing member 84 is coupled between the leg 55 and the housing 60 and is positioned within the housing 60.
  • a lower end of the biasing member 84 is attached to a flange 65 which is fixedly connected to an inner surface of the housing 60.
  • the biasing member 84 includes at least one spring element (for example, a compression spring) which generates a biasing force aligned along the longitudinal axis 433.
  • the biasing member 84 acts upon the leg 55 to urge the grip 46 away from the handle assembly 14 and the upper arm 33 toward the first position (in which the grip 46 is shown in solid lines in Figure 3) .
  • the biasing member 84 and the flange 65 may be similarly provided within the housing 61.
  • the sensor 390 includes a first sensing unit 391 attached to the lower end 55a of the leg 55, and a second sensing unit 392 attached to the upper end 33a of the upper arm 33.
  • the first sensing unit 391 and the second sensing unit 392 are positioned within the housing 60.
  • the distance between the first sensing unit 391 and the second sensing unit 392 is D. It will be understood that the distance D has a maximum value when the grip is at the first position and decreases when the grip 46 is moved toward the handle assembly 14 against the bias of the biasing member 84.
  • the maximum value of the distance D is preferably larger than the full actuation distance D1, such that the first sensing unit 391 and the second sensing unit 392 would not collide when the grip 46 is moved to the second position.
  • the first sensing unit 391 and the second sensing unit 392 cooperate to output a signal indicative of the distance D therebetween along the longitudinal axis 433.
  • the first sensing unit 391 is a magnet
  • the second sensing unit 392 is a hall-effect sensor.
  • the first sensing unit 391 is a reflector (such as a reflective tape)
  • the second sensing unit 392 is a laser sensor.
  • the first sensing unit 391 is an image pattern (for example, a QR pixel or a QR code)
  • the second sensing unit 392 is a linear charge-coupled device (CCD) .
  • the first sensing unit 391 is a light emitting diode
  • the second sensing unit 392 is a light intensity sensor.
  • the first sensing unit 391 is an infrared transmitter
  • the second sensing unit 392 is an infrared receiver.
  • the output signal of the second sensing unit 392 varies with the movement of the first sensing unit 391 towards the second sensing unit 392. Therefore, the output signal of the second sensing unit 392 provides an indication of the position of the grip 46 relative to the handle assembly 14.
  • the sensor 390 cooperates with the drive system assembly 22 in a similar way to the sensor 90 as described above.
  • the output signal of the second sensing unit 392 is provided to the controller 70.
  • the controller 70 in turn drives the wheels 26 at a variable speed based upon the output signal of the second sensing unit 392 and ultimately actuates the drive system 22 to drive the wheels 26 at a speed that matches the user’s walking pace.
  • first sensing unit 391 and the second sensing unit 392 may be swapped such that the first sensing unit 391 is coupled to the upper end 33a of the arm 33 and the second sensing unit 392 is coupled to the lower end 55a of the leg 55. It will be further appreciated that the first sensing unit 391 and the second sensing unit 392 may take any suitable form which is not limited to the examples described above.
  • the speed control assembly 30 includes a sensor 490 in accordance with a fifth embodiment of the invention for detecting and/or measuring a position of the grip 46 relative to the handle assembly 14.
  • the sensor 490 includes a potentiometer.
  • the potentiometer is formed by a resistive element 492 attached to the housing 60 and a sliding contact 491 attached to a lower end 55a of the leg 55 of the grip 46.
  • the resistive element 492 is aligned along the longitudinal axis 433.
  • the sensor 490 may further includes a measurement unit (not shown) for measuring the electrical resistance between the sliding contact 491 and an end (e.g., either an upper or a lower end) of the resistive element 492.
  • the measurement unit includes a current source which supplies a constant current between the sliding contact 491 and the end of the resistive element 492, and outputs a voltage signal which is equal to the voltage between the sliding contact 491 and the end of the resistive element 492.
  • the measurement unit includes a voltage source which supplies a constant voltage between two ends of the resistive element 492, and outputs a voltage signal which is equal to the voltage between the sliding contact 491 and the end of the resistive element 492.
  • the output signal varies with the change in the position of the leg 55 with respect to the handle assembly 14, and therefore provides an indication of a position of the grip 46 relative to the handle assembly 14.
  • the measurement unit may take any suitable form which is not limited to the example described above, as long as the measurement unit outputs a signal indicative of the position of the grip 46 relative to the handle assembly 14. Further, the measurement unit may be positioned within the housing 60 or may be positioned within the main body 18.
  • the sensor 490 cooperates with the drive system assembly 22 in a similar way to the sensor 90 as described above.
  • the output signal of the sensor 490 is provided to the controller 70.
  • the controller 70 in turn drives the wheels 26 at a variable speed based upon the output signal and ultimately actuates the drive system 22 to drive the wheels 26 at a speed that matches the user’s walking pace.
  • the resistive element 492 may be attached to the upper arm 33 instead of the housing 60. It will be appreciated that the sensor 490 may be modified such that the resistive element 492 is attached to the leg 55 of the grip 46, and the sliding contact 491 is attached to an inner surface of the housing 60 (or the upper arm 33) .
  • the speed control assembly 30 includes a sensor 590 in accordance with a sixth embodiment of the invention.
  • the grip 46 may or may not be movable relative to the handle assembly 14.
  • the sensor 590 includes a pair of pressure-sensitive or force sensitive devices (i.e., force sensors) 591, 592.
  • the force sensors 591, 592 are attached to the transverse gripping portion 50 of the grip 46. More specifically, the sensors 591, 592 are positioned inside the gripping portion 50.
  • the sensor 591 is covered by a handle 81 which is partially disposed around the grip 46.
  • the sensor 591 is connected to the handle 81 by a link 85.
  • the sensor 592 is covered by a handle 82 which is partially disposed around the grip 46, and is connected to the handle 82 by a link 86.
  • the force sensors 591, 592 detect forces F applied to the handles 81, 82 by the user.
  • the handles 81, 82 are preferably formed of a resiliently flexible material, such that the handles 81, 82 slightly flex under the gripping force of a user and are able to return to their original shapes upon release of the gripping force.
  • the resiliently flexible material include soft plastics, silicone, etc.
  • the links 85, 86 are preferably formed of a relatively rigid material which is able to transmit the forces applied to the handles 81, 82 to the force sensors 591, 592.
  • Each of the force sensors 591, 592 generates an output signal indicating an amount of force applied to the respective handle by a hand of the user.
  • the output signals of the force sensors 591, 592 are received by the controller 70, and the controller 70 controls a speed of the drive system assembly 22 according to the output signals.
  • the controller 70 drives the motor 24 to drive the wheels 26 at a speed which is proportional to the amount of forces detected by the sensors 591, 592. Therefore, the controller 70 drives the wheels 26 faster when the force sensors 591, 592 output higher readings.
  • the user may hold the handles 81, 82 and push the grip 46 generally towards the handle assembly 14 so as to push the mower forward.
  • the force sensors 591, 592 then detect the forces applied to the grip 346 by the user towards the handle assembly 14. Accordingly, the ground travel speed of the lawn mower 10 is controlled based upon the readings of the force sensors 591, 592 which result from the user’s pushing the grip 46 as the user is walking.
  • the forward movement of the lawn mower 10 further reduces the readings of the force sensors 591, 592.
  • the controller 70 ultimately actuates the drive system 22 to drive the wheels 26 at a speed that matches the user’s walking pace, by using the output signals of the force sensors 591, 592.
  • the controller 70 may drive the motor 24 based upon a mean of the readings of the sensors 591, 592.
  • only one of the sensors 591, 592 may be provided within the gripping portion 50 (i.e. one of the sensors 591, 592 may be omitted entirely) .
  • the force sensors 591, 592 may be selected such that they are sensitive to forces along a particular direction only.
  • the particular direction may be along the longitudinal axis 433.
  • the speed control assembly 30 includes a sensor 690 in accordance with a seventh embodiment of the invention for detecting and/or measuring a position of the grip 46 relative to the handle assembly 14.
  • the sensor 690 is a pressure-sensitive or force sensitive device (i.e., a force sensor) .
  • the sensor 690 is attached to the handle assembly 14 (in particular, the upper arm 33 or the housing 60) and is positioned within the housing 60.
  • the biasing member described above which biases the grip 46 along the longitudinal axes 433, 434 is shown as a biasing member 87 in this embodiment.
  • the biasing member 87 is coupled between the leg 55 and the sensor 690 and is positioned within the housing 60.
  • biasing member 87 an upper end of the biasing member 87 is attached to a lower end 55a of the leg 55.
  • a lower end of the biasing member 87 is coupled to the sensor 690.
  • the coupling between the biasing member 87 and the sensor 690 allows the biasing member 87 to transmit force to the sensor 690.
  • the biasing member 87 generates a biasing force which is aligned along the longitudinal axis 433 and includes at least one spring element (for example, a compression spring) .
  • the biasing member 87 and the sensor 690 may be similarly provided within the housing 61.
  • the biasing member 87 acts upon the leg 55 to urge the grip 46 away from the handle assembly 14 toward the first position of the grip 46.
  • the biasing member 87 has a maximum length along the longitudinal axis 433 when the grip is at the first position, and is fully compressed and has a minimum length along the longitudinal axis 433 when the grip 46 is moved to the second position.
  • the biasing member 87 is compressed and applies a corresponding force to the sensor 690.
  • the amount of force applied to the sensor 690 is determined by the distance the biasing member 87 is deformed from its maximum length according to Hooke’s law.
  • the distance the biasing member 87 is deformed is equivalent to a length of the displacement of the grip 46 relative to the handle assembly 14. Therefore, the reading of the force sensor 690 provides an indication of the position of the grip 46 relative to the handle assembly 14.
  • the sensor 690 cooperates with the drive system assembly 22 in a similar way to the sensor 90 as described above.
  • the output signal of the sensor 690 is provided to the controller 70.
  • the controller 70 in turn drives the wheels 26 at a variable speed based upon the output signal and ultimately actuates the drive system 22 to drive the wheels 26 at a speed that matches the user’s walking pace.
  • the speed control assembly 30 may be configured such that the biasing member 87 is pre-loaded with a predetermined compression when no external forces are exerted on the grip 46. Therefore, the controller 70 may only activate the drive system assembly 22 in response to detecting that the amount of force detected by the sensor 690 is higher than a threshold value. After the drive system assembly is activated, the controller may drive the motor 24 to drive the wheels 26 at a speed which is proportional to the amount of force detected by the sensor 690 which is over the threshold value.
  • the senor 690 may be attached to the upper arm 33 and the biasing member 87 may be positioned within the hollow portion of the upper arm 33 instead of the housing 60.
  • the sensor 690 may be coupled to that tubular structure and the biasing member 87 may be disposed within the hollow portion of the tubular structure.
  • the speed control assembly 30 includes a sensor 790 in accordance with an eighth embodiment of the invention for detecting and/or measuring a position of the grip 46 relative to the handle assembly 14.
  • the sensor 790 includes a metal plate 791 attached to a lower end 55a of the leg 55, and a plurality of discrete metal contacts 792 which are attached to an inner surface of the housing 60.
  • the metal plate 791 may be a flat metal plate.
  • the metal contacts 792 are spaced apart from one another along the longitudinal axis 433.
  • the metal plate 791 and the metal contacts 792 are arranged such that when the grip 46 is pushed by a user to move from the first position to the second position, the metal plate 791 forms an electrical connection with each one of the metal contacts 792 sequentially.
  • the sensor 790 may further includes a measurement unit (not shown) for measuring which one of the metal contacts 792 is electrically connected to the metal plate 791.
  • the measurement unit may be configured in various ways. In an example, the measurement unit applies a voltage to the metal plate 791, and subsequently detects the voltage at each of the metal contacts 792. The particular metal contact which has the same voltage level as that applied to the metal plate 791 is in electrical connection with the metal plate 791.
  • the measurement unit may be positioned within the housing 60 or may be positioned within the main body 18.
  • the sensor 790 outputs a signal indicating the identity of the particular metal contact which is in electrical connection with the metal plate 791. It will be appreciated that the identity of that particular metal contact is determined by a position of the grip 46 relative to the handle assembly 14. Therefore, the output signal of the sensor 790 provides an indication of the position of the grip 46 relative to the handle assembly 14.
  • the metal plate 791 may have a length L along the longitudinal axis 433. Neighbouring ones of the metal contacts 792 may have a gap (i.e., edge-to-edge distance) G along the longitudinal axis 433. In an example, the length L is smaller than the gap G. Consequently, when the metal plate 791 is moved into the gap G between neighbouring ones of the metal contacts 792, the metal plate 791 is not electrically connected to any of the metal contacts 792 and thus the sensor 790 is “unaware” of the position of the metal plate 791 at that time. To solve this problem, the sensor 790 may “latch” its output signal.
  • the sensor 790 detects that a particular one of the metal contacts 792 is in electrical connection with the metal plate 791, the sensor 790 generates an output signal indicating the identity of that particular one of the metal contacts 792, and the output signal remains unchanged (despite the movement of the metal plate 791) until the sensor 790 detects that a different one of the metal contacts 792 becomes connected to the metal plate 791.
  • This “latching” processing may alternatively be performed by the controller 70 based upon the output signal of the sensor 790.
  • the controller 70 continues to treat the metal plate 791 as being connected to a metal contact 792 as indicated in the latest valid output signal of the sensor 790.
  • the length L may be larger than the gap G. Consequently, when the metal plate 791 is moved to the gap G, the metal plate 791 may be electrically connected to two of the metal contacts 792 at the same time.
  • the sensor 790 or the controller 70 may treat the metal plate 791 as being connected to either one of the metal contacts 792 or an immediate position between the metal contacts 792 along the longitudinal axis 433.
  • the sensor 790 cooperates with the drive system assembly 22 in a similar way to the sensor 90 as described above.
  • the output signal of the sensor 790 is provided to the controller 70.
  • the controller 70 in turn drives the wheels 26 at a variable speed based upon the output signal and ultimately actuates the drive system 22 to drive the wheels 26 at a speed that matches the user’s walking pace.
  • the controller 70 may activate the drive system assembly 22 in response to detecting that the metal plate 791 has formed an electrical connection with the top one of the metal contacts 792. With the grip 46 being pushed further, the metal plate 791 forms an electrical connection with a lower one of the metal contacts 792, and the controller may drive the motor 24 to drive the wheels 26 at a faster speed.
  • the metal contacts 792 may be attached to the upper arm 33 instead of the housing 60. It will be appreciated that the sensor 790 may be modified such that the metal plate 791 is attached to an inner surface of the housing 60 (or the upper arm 33) , and the plurality of discrete metal contacts 792 are attached to an outer surface of the lower end 55a of the leg 55.
  • each of the sensors 90, 190, 390, 490, 690, 790 may be similarly provided within the housing 61 or the upper arm 34.

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  • Life Sciences & Earth Sciences (AREA)
  • Environmental Sciences (AREA)
  • Harvester Elements (AREA)

Abstract

La faucheuse (2) comprend un guidon (20), un moteur (10), un système de commande. Le guidon a une poignée de guidon en plastique (32) qui coulisse vers le haut et vers le bas sur le guidon pour réduire et augmenter la vitesse par rapport au sol de la faucheuse.
PCT/CN2019/109909 2018-10-29 2019-10-08 Faucheuse WO2020088195A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
HK18113809 2018-10-29
HK18113809.4 2018-10-29

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WO2020088195A1 true WO2020088195A1 (fr) 2020-05-07

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PCT/CN2019/109909 WO2020088195A1 (fr) 2018-10-29 2019-10-08 Faucheuse

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114365616A (zh) * 2021-12-30 2022-04-19 江苏东成工具科技有限公司 手推式电动工具
US11844305B2 (en) 2019-07-25 2023-12-19 Nanjing Chevron Industry Co., Ltd. Walk-behind self-propelled working machine
CN114365616B (zh) * 2021-12-30 2024-05-24 江苏东成工具科技有限公司 手推式电动工具

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6082083A (en) * 1998-09-18 2000-07-04 The Toro Company Ground speed control system
CN201752183U (zh) * 2010-04-21 2011-03-02 苏州宝时得电动工具有限公司 自驱割草机
WO2011131031A1 (fr) * 2010-04-21 2011-10-27 苏州宝时得电动工具有限公司 Tondeuse à gazon et procédé de commande pour commander son fonctionnement à entraînement automatique
CN102232331A (zh) * 2010-04-21 2011-11-09 苏州宝时得电动工具有限公司 自驱割草机
CN104541737A (zh) * 2013-10-10 2015-04-29 南京德朔实业有限公司 园林工具
WO2018237251A1 (fr) * 2017-06-23 2018-12-27 Tti (Macao Commercial Offshore) Limited Ensemble de régulation de vitesse

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6082083A (en) * 1998-09-18 2000-07-04 The Toro Company Ground speed control system
CN201752183U (zh) * 2010-04-21 2011-03-02 苏州宝时得电动工具有限公司 自驱割草机
WO2011131031A1 (fr) * 2010-04-21 2011-10-27 苏州宝时得电动工具有限公司 Tondeuse à gazon et procédé de commande pour commander son fonctionnement à entraînement automatique
CN102232331A (zh) * 2010-04-21 2011-11-09 苏州宝时得电动工具有限公司 自驱割草机
CN104541737A (zh) * 2013-10-10 2015-04-29 南京德朔实业有限公司 园林工具
WO2018237251A1 (fr) * 2017-06-23 2018-12-27 Tti (Macao Commercial Offshore) Limited Ensemble de régulation de vitesse

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11844305B2 (en) 2019-07-25 2023-12-19 Nanjing Chevron Industry Co., Ltd. Walk-behind self-propelled working machine
CN114365616A (zh) * 2021-12-30 2022-04-19 江苏东成工具科技有限公司 手推式电动工具
CN114365616B (zh) * 2021-12-30 2024-05-24 江苏东成工具科技有限公司 手推式电动工具

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