A powered device includes a powerhead unit and an attachment unit selectively attachable to and powered by the powerhead unit. The powerhead unit includes a motor, a first shaft segment having a first driveshaft segment coupled to the motor, and a first connecting portion attached to the first shaft segment. The attachment unit includes an operational unit configured to be driven by the motor, a second shaft segment having a second driveshaft segment coupled to the operational unit, and a second connecting portion attached to the second shaft segment for coupling to the first connecting portion. One of the first connecting portion and the second connecting portion defines an axial opening having a keyway and includes a button having a hook portion. The other of the first connecting portion and the second connecting portion defines a slot and includes a key.

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.

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 gripping device includes a housing has an annular flange and a plurality of positioning recesses provided at the annular flange, a rear handle assembled with the annular flange of the housing, a push button pivoted to the rear handle and partially exposed to the outsides, a positioning block disposed in the rear handle, and a link rod having two ends pivoted to the push button and the positioning block, respectively. When the push button is unlocked, the positioning block is driven by the link rod to be disengaged from the positioning recesses, such that the rear handle is rotatable to adjust angle. When the push button is locked, the positioning block is engaged with one of the positioning recesses under the force of an elastic member for positioning the rear handle.

Therefore, a user can operate the gripping device at an ergonomic angle.

A gripping device includes a housing has an annular flange and a plurality of positioning recesses provided at the annular flange, a rear handle assembled with the annular flange of the housing, a push button pivoted to the rear handle and partially exposed to the outsides, a positioning block disposed in the rear handle, and a link rod having two ends pivoted to the push button and the positioning block, respectively. When the push button is unlocked, the positioning block is driven by the link rod to be disengaged from the positioning recesses, such that the rear handle is rotatable to adjust angle. When the push button is locked, the positioning block is engaged with one of the positioning recesses under the force of an elastic member for positioning the rear handle.

Therefore, a user can operate the gripping device at an ergonomic angle.

A working machine may include: a working part; a prime mover configured to drive the working part; a housing supporting the working part; a handle attached to the housing such that the handle is rotatable about a rotation axis with respect to the housing and configured to be grasped by a user; and an elastic member arranged between the housing and the handle. The housing may comprise a first surface. The handle may include a second surface that faces the first surface in a rotation axis direction with an interval therebetween. The elastic member may be arranged between the first surface and the second surface.

A working machine may include: a working part; a prime mover configured to drive the working part; a housing supporting the working part; a handle attached to the housing such that the handle is rotatable about a rotation axis with respect to the housing and configured to be grasped by a user; and an elastic member arranged between the housing and the handle. The housing may comprise a first surface. The handle may include a second surface that faces the first surface in a rotation axis direction with an interval therebetween. The elastic member may be arranged between the first surface and the second surface.

A device for holding a cutting blade having a cam, including a blade pivot pin for mounting the cutting blade in a pivoting manner on a cutting tool, and a cam pivot pin connected to a driving mechanism of the blade, a first pivot pin chosen from the blade pivot pin and the cam pivot pin being provided with a matching-shape axial lock. The other pivot pin is provided with a manually tightened axial lock. The device includes a catch having a first end with a latch able to be engaged with and held on the first pivot pin by matching shapes, and a second end able to be engaged with and held on the pivot pin provided with the manually tightened axial lock.

A device for holding a cutting blade having a cam, including a blade pivot pin for mounting the cutting blade in a pivoting manner on a cutting tool, and a cam pivot pin connected to a driving mechanism of the blade, a first pivot pin chosen from the blade pivot pin and the cam pivot pin being provided with a matching-shape axial lock. The other pivot pin is provided with a manually tightened axial lock. The device includes a catch having a first end with a latch able to be engaged with and held on the first pivot pin by matching shapes, and a second end able to be engaged with and held on the pivot pin provided with the manually tightened axial lock.

A working machine may include a pipe, a body unit, a tool unit, a shaft, and a speed increaser. The body unit may be disposed at a rear end of the pipe and include a prime mover. The tool unit may be disposed at a front end of the pipe and include a front tool. The shaft may be disposed inside the pipe and be configured to transmit power of the prime mover to the front tool. The speed increaser may be disposed between the shaft and the front tool. The speed increaser may be configured to make a rotational speed of the front tool higher than a rotational speed of the shaft.