An overload protection mechanism for use with an electrically hedge trimmer includes a transmission ring gear, a roller disposed in the transmission ring gear, a transmission shaft disposed in the transmission ring gear and eccentrically connected with two rocker arms, and a clutch member movably sleeved on the transmission shaft. When excessive resistance is applied to the rocker arms, the clutch member is pushed by the roller to compress an elastic member. This allows the transmission ring gear to be idled. When the resistance applied to the rocker arms is smaller than the rebound force provided by the elastic member, the clutch member is engaged with the roller, such that the transmission ring gear drives the transmission shaft to rotate through the clutch member.

Thus, the overload protection mechanism of the present invention carries out overload protection to the motor for extending the life of the motor.

A power tool includes a motor, a speed reducer and a speed-reducing-ratio change mechanism. The speed reducer includes planetary gear mechanisms arranged in multiple stages. The speed-reducing-ratio change mechanism is configured to change a speed reducing ratio of the speed reducer in response to a change of a rotating direction of a motor shaft. At least two stages of the planetary gear mechanisms are configured such that an internal gear in each stage selectively functions as a fixed element. The speed-reducing-ratio change mechanism includes a one-way clutch and a lock mechanism configured to non-rotatably lock the internal gears of the at least two stages when the one-way clutch does not transmit rotation, and to rotate the internal gears of the at least two stages when the one-way clutch transmits rotation. The at least two stages include a speed-increasing planetary gear mechanism and a speed-reducing planetary gear mechanism.

A trimming machine capable of suppressing damage to a gear when blades are locked, with a simple structure without increasing weight and cost. The trimming machine includes: an electric motor; a blade drive gear rotationally driven by the electric motor; an eccentric cam provided in the gear; and a pair of blades relatively slidably facing and contacting each other, in which the eccentric cam is adapted to reciprocate the pair of blades in relatively opposite directions along the longitudinal direction of the blades, thereby grinding cutting edges against each other, the cutting edges provided in a protruding manner with gaps therebetween in the pair of blades, and a shock absorbing portion is provided between a connecting portion connected to the eccentric cam and the cutting edges in each of the blades.

An outdoor device comprising: a first blade comprising a first blade opening at a proximal end; a second blade comprising a second blade opening at a proximal end; a first cam coin comprising a first cam coin opening; a second cam coin comprising a second cam coin opening; an output gear comprising an output gear opening; and an output shaft comprising a first portion and a second portion, the first portion wider than the respective openings, the second portion wider than the output gear opening, wherein the respective openings are aligned to form a cam assembly, and wherein the output shaft is positioned through the respective aligned openings such that the cam assembly is positioned at a perpendicular plane respective to the second portion and supported for rotation about an axis to rotate eccentrically with respect to the output shaft axis.

A trimmer includes a handle assembly, a power mechanism installed at one end of the handle assembly, and a blade assembly connected to the power mechanism. The power mechanism has a housing assembly, a motor received in the housing assembly, and a power transmission assembly mounted on the housing assembly. The motor is an external rotor motor with a diameter greater than or equal to 50 mm. The power transmission assembly has pinion coaxially sleeved on an output shaft of the motor and a big gear meshing with the small gear, and a transmission ratio of the small gear to the big gear is less than 6. By such arrangement, the trimmer can obtain the best output effect under a condition that the output power of the motor is unchanged.

An electric working machine capable of efficiently cooling components disposed inside, as well as simplifying assembling work and reducing man-hours and production cost. A motor, control board for controlling the motor, rod fixture secured to the front side of the motor, and air guiding partitioning member secured to the rear side of the motor form a motor assembly. The air guiding partitioning member includes a partitioning plate hermetically partitioning between air exhaust and intake ports provided with a predetermined interval longitudinally in the body casing. The partitioning plate has an air guiding window for delivering cooling air taken in from the air intake port to an opening for sucking air on the front side of the motor through a space between the motor and body casing. The control board is disposed on the rear side of the partitioning plate.

A hedge trimmer includes a blade assembly having a first blade and a second blade, a housing, a prime mover, and a transmission device. The first blade includes a first body portion and a plurality of first tooth portions, and the second blade includes a second body portion and a plurality of second tooth portions. The first blade includes a first connection assembly including a first driving portion and a first connecting portion, and the second blade includes a second connection assembly including a second driving portion and a second connecting portion. The first connecting portion and the first body portion form a detachable connection, the second connecting portion and the second body portion form a detachable connection, and the first connecting portion is at least partially located outside the housing.

A gardening trimmer may include: a first blade connected to a first cam member and configured to reciprocate in response to rotation of the first cam member; and a second com connected to a second cam member and configured to reciprocate in opposite phase to the first blade in response to rotation of the second cam member. The first cam member includes a first eccentric cam configured to revolve around a first rotation axis and is connected to the first blade at the first eccentric cam. The second cam member includes a second eccentric cam configured to revolve around a second rotation axis and is connected to the second blade at the second eccentric cam. Each of the first and second blades is configured to reciprocate along a plane including the first and second rotation axis.

An electric handheld working machine includes: a housing including: a motor as a drive source of a working unit; an operating handle; and attaching members provided on an outer surface of the housing and configured to attach a battery to supply electric power to the motor. The attaching members includes: a connecting terminal connected to the battery; a step provided above the connecting terminal and configured to function as a drainage path to drain drops of water to sides; and openings formed in the sides of the attaching members to communicate with the drainage path. The openings communicate with a cooling air flow path configured to allow cooing air to flow through a gap between a back surface of the battery attached to the attaching members and the outer surface between the attaching member.

The present invention relates to cutting tools, in particular, to control systems for cutters such as vegetation cutters, especially hedge cutters or trimmers (10). Hedge cutters (10) frequently suffer in use from a problem of blocked cutting blades when they encounter a twig or branch whose size or density exceeds the capacity of the blades. We describe a vegetation cutting apparatus (10) having a plurality of cutting blades (11,12), at least one of which blades (11,12) is drivable by an electric motor. At least one driven blade (11,12) is movable between two predefined points of maximum travel. The apparatus (10) includes a control mechanism which causes a change of direction in the movement of the at least one movable blade at a point intermediate the points of maximum travel in response to an event sensed by the control mechanism.