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公开(公告)号：US20210321560A1
公开(公告)日：2021-10-21
申请号：US17357568
申请日：2021-06-24
发明人： Xiubo Dai
IPC分类号： A01D34/416 , A01D34/78
摘要： A grass trimmer includes a grass trimmer head, a brushless motor, a drive circuit, and a controller. The grass trimmer head includes a spool and a head housing. The spool is configured to wind a grass trimmer rope. The head housing is configured to accommodate the spool. The grass trimmer has an automatic winding mode. In the automatic winding mode, the brushless motor drives at least one of the spool and the head housing so that the spool and the head housing rotate relatively and the grass trimmer rope is automatically wound onto the spool. The controller is configured to: in the automatic winding mode, output a control signal to the drive circuit according to at least one of the given voltage and the given current so that the rotation speed of the brushless motor is basically constant.
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公开(公告)号：US20210300167A1
公开(公告)日：2021-09-30
申请号：US17106707
申请日：2020-11-30
申请人： Kubota Corporation
发明人： Masahiro Yamada , Hirokazu Ito
摘要： An electric powered work vehicle is to be configured so that holding of the battery at the storage position can be carried out easily at the time of attachment of the battery. There is provided guide mechanism for movably guiding the battery while supporting it along a horizontal direction between a storage position and a detachment position located away from the storage position along the horizontal direction. There is provided a holding mechanism configured to be automatically operated to a holding state capable of holding the battery at the storage position when the battery is moved to the storage position along the guide mechanism. There is provided a releasing operational portion manually operable to render the holding mechanism to a releasing state for allowing movement of the battery to the detachment position.
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公开(公告)号：US11096325B2
公开(公告)日：2021-08-24
申请号：US15856404
申请日：2017-12-28
申请人： LG ELECTRONICS INC.
发明人： Hyunsup Song , Changhyeon Lee
摘要： A lawn mower robot includes an inner body provided with casters and wheels for moving, a plurality of blades rotatably provided on a bottom surface of the inner body to cut grass, a drive motor mounted on the wheels, respectively, to independently drive the wheels, and an outer cover mounted on and configured to surround an outer side of the inner body to be movable in forward, backward, leftward and rightward directions with respect to the inner body when colliding with an obstacle. A plurality of ultrasonic sensors are provided to sense an obstacle, and an ultrasonic guide unit is formed to be recessed rearward from a front end portion of the outer cover so as to restrict a downward propagation angle of ultrasonic waves generated from the ultrasonic sensors.
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公开(公告)号：US20210219491A1
公开(公告)日：2021-07-22
申请号：US17143695
申请日：2021-01-07
发明人： Gary MARKHAM
摘要： A brush cutter may include a back plate and a spindle arrangement with the spindle arrangement abutting the back plate. The brush cutter may also include an angular arm mechanically formed integrally with or mechanically connected to the spindle arrangement where the angular arm is at angle θ relative to the back plate. Angle θ is an acute angle. The brush cutter may also include a mower deck, where the mower deck is mechanically connected to the angular arm and a blade, the blade mechanically connected to the mower deck.
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公开(公告)号：US20210185911A1
公开(公告)日：2021-06-24
申请号：US17254522
申请日：2019-06-25
申请人： HUSQVARNA AB
发明人： Jonas Agerhall
IPC分类号： A01D34/73 , A01D34/00 , A01D34/64 , A01D34/78 , G05B19/4155
摘要： A robotic lawnmower comprises a blade carrier (200) and a cutting blade (400) pivotally connected thereto, the blade comprising a substantially flat cutting portion (401) extending along a cutting portion plane (410), a blade carrier interface (404), and an offset portion (406) interconnecting the cutting portion (401) and the blade carrier interface (404). When operating the robotic lawnmower, the blade carrier interface (404) of the cutting blade (400) follows a circular path in a blade carrier interface rotation plane (415), and the cutting portion (401) follows a circular path in a cutting plane (402), offset from the blade carrier interface rotation plane N (415) by a cutting plane offset distance (408).
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公开(公告)号：US20210170852A1
公开(公告)日：2021-06-10
申请号：US17113044
申请日：2020-12-05
发明人： Jun Fan , Chaoqun Wang , Qunli Wei
摘要： The invention provides a mower, which comprises a battery package assembly and a frame for bearing the battery package assembly; the battery package assembly comprises a battery package and a fixing plate, the battery package is fixed on the fixing plate, a plurality of first pulleys are arranged at the bottom of the fixing plate, and the first pulleys are distributed along the installation direction of the battery package assembly. The frame comprises a supporting surface, and the first pulleys are supported on the supporting surface. The battery package assembly of the lawn mower moves on the supporting surface in a rolling mode, generated friction force is small, and convenience and labor saving can be achieved for the mounting and dismounting processes of the battery package assembly.
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公开(公告)号：US20210169000A1
公开(公告)日：2021-06-10
申请号：US16763249
申请日：2017-11-17
发明人： Yoshihiko Yamagishi , Toru Yuki
摘要： A work machine (lawnmower) comprises: a main body unit having a work unit that performs a prescribed operation; and a travel motor that generates a rotational drive force that causes at least the main body unit to travel. The work machine also comprises: a travel operation unit that issues command information relating to the rotation speed of the travel motor; and a control unit that varies the rotation speed of the travel motor commanded by the travel operation unit on the basis of variation in the load on the work unit.
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公开(公告)号：US11026366B2
公开(公告)日：2021-06-08
申请号：US16342483
申请日：2017-11-16
发明人： Jun Fukano , Masato Takeda , Keisuke Muraoka
IPC分类号： A01D34/69 , A01D34/00 , A01D34/78 , A01D69/02 , G05D1/02 , E01H5/04 , A01B33/02 , B62D51/06 , A01D34/67 , A01D34/68 , A01D101/00
摘要： Walk-behind power equipment includes: a main body provided with at least one front wheel and left and right rear wheels and a work unit; travel motors provided for the respective rear wheels; a handle extending from the main body rearward and upward; at least one of a tilt angle detector that detects a tilt angle of the main body and a load detector that detects a downward load applied to the handle; a yaw rate detector that detects a yaw rate; and a control unit that drive-controls the travel motors. The control unit determines whether the main body is in a rearward tilted state based on the tilt angle or the downward load, and if it is determined that the main body is not in the rearward tilted state, performs straight-line travel control to set a rotational speed difference between the travel motors to reduce the yaw rate.
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公开(公告)号：US20210153431A1
公开(公告)日：2021-05-27
申请号：US17008790
申请日：2020-09-01
申请人： HUSQVARNA AB
发明人： Thomas Hermansson , Per Rydberg
摘要： A lawn mower may include a blade housing configured to house a blade assembly, a powerhead configured to selectively operate the blade assembly responsive to application of power from one or more batteries, a battery receptacle operably coupled to the powerhead and configured to receive the one or more batteries, and a battery adapter configured to be operably coupled to the lawn mower and to a backpack battery to enable the powerhead to receive power from the backpack battery in addition to or as an alternative to one of the one or more batteries when the backpack battery is removed from a backpack harness and mated with the battery adapter.
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公开(公告)号：US20210151993A1
公开(公告)日：2021-05-20
申请号：US17099526
申请日：2020-11-16
摘要： The invention provides a power tool, which comprises a motor, at least two battery packs supplying power to the motor and arranged in parallel. The power tool also comprises a relay control circuit used for connecting the motor and the battery packs, and the relay control circuit is provided with a controller, and a plurality of relay switch circuits connected with the controller. The controller is used for detecting the electric energy and/or an user state of battery packs and generates battery pack selection signals, the relay switch circuits and the battery packs are arranged one-to-one, the relay switch circuits receive the battery pack selection signals and control turning on/turning off of relays switches therein, and further switch the battery packs in the on state, to make only one battery pack in the on state at the same time.
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