A trimmer head (1) arranged to be driven to rotate a trimmer line (3), wherein the trimmer head comprises a housing (1a, 1b) and an inner body (1c) connected to a trimmer line spool (13, 39), the trimmer head being characterized in that the inner body is arranged to be movable relative the housing so that a trimmer line spooled around the trimmer line spool is released and to be pulled out by a centrifugal force caused by the rotation of the trimmer head, thereby allowing feed of the trimmer line. A trimmer (10) comprising a trimmer head according to above, wherein the trimmer further comprises drive means (2, 4) for driving the trimmer head to rotate and wherein the trimmer is arranged to cause a relative movement of the inner body relative the housing by changing the rotation speed of the trimmer head.

The present invention is directed to a string trimmer line feeding mechanism having a sliding lever that locks a spool relative to the spool housing, and only feeds additional cutting line when the user actuates a button. This brakes a motor, which generates a force acting on the spool to move the lever into an unlocked position, allowing the spool to rotate relative to the spool housing and feed additional cutting line.

A trimmer head (1) is disclosed arranged to be driven around a rotational axis (ax), via an interface (2), to rotate a trimmer line (3). The trimmer head (1) comprises a housing (1a, 1b), the interface (2), a trimmer line spool (5, 5), and an automatic feed mechanism (7). The automatic feed mechanism (7) is configured to release a trimmer line (3) spooled around the trimmer line spool (5, 5) when the trimmer head (1) is subjected to a change in rotational speed, via the interface (2), at a higher rate than a threshold rate of change in rotational speed. The trimmer head (1) further comprises an actuator (9, 9) connected to the automatic feed mechanism (7) such that a manual actuation of the actuator (9, 9) releases the trimmer line (3) spooled around the trimmer line spool (5, 5). The present disclosure further relates to a trimmer (13) comprising a trimmer head (1).

A line(F)-type trimmer head (1) is described, configured to rotate around a rotation axis (A-A) and comprising a housing (3) composed of at least one first housing portion (5) and one second housing portion (7), which can be torsionally and axially coupled to one another and which form a volume for a stock of cutting line (F). The second housing portion comprises at least one first passage (31), transverse with respect to the rotation axis of the trimmer head, with a first end and a second end configured and arranged so as to be positioned in correspondence of the two exit holes (9) for the cutting line, so that a cutting line can be inserted through one exit hole and extracted from the other exit hole, passing along the first transverse passage.

A cutting head for use with a cutting tool, such as a grass trimmer. The cutting head has a housing, a line spool and a supporting cap. One end of the housing is coupled to an end of a motor output shaft and another end has an opening. A line spool is disposed in the housing and rotates along with the housing. At least one end of a line wound around the line spool extends out of the housing. The supporting cap is rotatably disposed at the end of the line spool adjacent to the opening and is exposed to an exterior of the housing through the opening.

A string trimmer includes a trimming head, a driving device, and an operating device. The trimming head includes a spool, a head housing formed with an accommodating space, and a transmission member mounted to the spool that can move freely between the head housing and the spool in the direction of a straight line perpendicular to the direction of the rotation axis. The trimming line has an effective portion extending from the accommodating space. When the length of the effective portion of the trimming line is larger than a preset value, the transmission member automatically releases the head housing. When the length of the effective portion of the trimming line is less than the preset value, the transmission member locks the head housing.

A line trimmer or edger includes a trimmer head configured to rotate a portion of a trimmer line comprising a cutting end of the trimmer line; a trimmer motor configured to drive the rotation of the trimmer head; a continuous line feed mechanism configured to continuously feed the trimmer line into the trimmer head while the continuous line feed mechanism is active; and one or more line feed activation mechanisms configured to control an activation and a deactivation of the continuous line feed mechanism.

A robotic lawnmower comprising a robotic body and a trimmer mechanism. A mount column hole is arranged in a side face of the robotic body. The trimmer mechanism includes a mount, a trimmer head and a drive motor. The mount includes a stand and a connection portion. The connection portion is fixedly connected to the stand and configured to be inserted into the mount hole. The trimmer head is rotatably arranged on a bottom face of the stand. The drive motor is configured to drive the trimmer head to rotate. The robotic lawnmower with the trimmer mechanism is capable of covering and trimming the areas within a specific width distant from the edges of the lawns, which effectively solves the problem that the conventional robotic lawnmowers are incapable of covering and trimming such areas of the lawns, reduces manual workload, and lowers cost of manpower.

A string trimmer includes a trimmer head and a driving device having a motor for driving the trimmer head to rotate around a rotation axis. The trimmer head includes a spool, a head housing formed with an accommodating space, and a transmission member mounted to the spool. The spool is at least partially accommodated in the accommodating space. The transmission member includes a driving portion. The head housing is formed with a mating portion to mate with the driving portion.

An accessory mount device for a power tool, wherein a reference axis forms an axis of rotation of the accessory mount device, the accessory mount device including a housing forming an interior volume, the housing including a ramped surface in the interior volume at which a bearing is positioned; a first plate forming a channel at which the bearing is positioned at the ramped surface to push the first plate along the reference axis; and a second plate configured to push a spool in the direction of the reference axis, wherein the bearing is configured to selectively push the first plate to the second plate when a centrifugal force threshold is exceeded, and wherein the second plate is allowed to rotate around the reference axis separate from the first plate.