A spool and a trimmer head. The trimmer head includes a housing defining a cavity and rotatable about an axis. A spool is supported in the cavity and operable to support line to be dispensed. The spool is movable along the axis relative to the housing, and the spool and the housing define cooperating conical surfaces to center the spool during movement of the spool toward and in a position relative to the housing.

A grass trimmer includes a trimming head, a driving device for driving the trimming head to rotate so as to cut vegetation and an operating device for a user to operate so as to control the driving device. The trimming head includes a spool and a line holding member, the spool is used to wind a cutting line, and the line holding member is formed with a line holding structure. The driving device includes a motor. The grass trimmer has an auto-winding mode. In the auto-winding mode, the motor drives at least one of the spool and the line holding member to make the spool and the line holding member rotate relatively so that the cutting line is wound on the spool automatically.

A grass trimmer includes a grass cutting head and a driving mechanism. The grass cutting head includes a head housing, a spool, and a clutch mechanism. The clutch mechanism is configured to implement power transmission between the head housing and the spool. The clutch mechanism includes an elastic member which is elastically deformable.

A trimmer line spool has first and second spool chambers for a trimmer line. First and second holder pairs are provided. The first holder pair has first and second trimmer line holders associated with the first spool chamber and the second spool chamber, respectively. The second holder pair has first and second trimmer line holders associated with the first spool chamber and the second spool chamber, respectively. The trimmer line holders of the first holder pair each have a first opening for the trimmer line. The trimmer line holders of the second holder pair each have a second opening for the trimmer line. A diameter of the first openings is larger than a diameter of the second openings. The first openings are positioned at an angle of 150° to 210° to each other. The second openings are positioned at an angle of 150° to 210° to each other.

A grass cutting head includes a spool for winding a grass cutting line, a head housing for accommodating the spool, a first guiding structure formed on the head housing, and a second guiding structure formed on the spool. The first guiding structure guides the grass cutting line through the head housing when threading the grass cutting line. The second guiding structure guides the grass cutting line to move and be wound around the spool by relative motion created between the spool and the head housing. The head housing includes a first housing and a second housing. The first guiding structure is formed on the second housing. The spool is disposed between the first housing and the second housing. The first housing or the second housing is provided with an outer threading hole for allowing the grass cutting line to pass in or out.

An arbor adapter for converting a common angle grinder to a compact line trimmer is disclosed. The trimmer, as converted, is powerful, efficient, and as safe as any of the typical uses for angle grinders. The prototype line trimmer is 13″ in length and may be operated with one hand if desired. Conventional line trimmers are in the 66″ range, or five times the length of the present invention. The invention requires no alteration of the factory angle grinder and guard. The invention could be modified as to material composition yet still meet the original scope and claims.

A grass trimmer includes a grass cutting head and a driving mechanism. The grass cutting head includes a head housing, a spool, and a clutch mechanism. The clutch mechanism is configured to implement power transmission between the head housing and the spool. The clutch mechanism includes an elastic member which is elastically deformable.

An assembly includes a mowing head (3), an output shaft (8), and a fastening device (10). The output shaft (8) is drivable in rotation about an axis of rotation (9). The assembly (2) has an anti-rotation lock (11) and an axial lock (16). The mowing head (3) is held corotatingly on the output shaft (8) by the anti-rotation lock (11). The axial lock (16) locks the mowing head (3) in a blocking position (30) of the output shaft (8) against a relative movement in the direction of the axis of rotation (9) of the output shaft (8) and in an inoperative position (31) releases the mowing head (3) for detachment from the output shaft (8). The fastening device (10) includes an actuating element (24) accessible to the operator. The axial lock (16) is switchable into the blocking position (30) and into the inoperative position (31) by the actuating element (24).

Disclosed is a four-line nylon cutter assembly for a mower, including: an upper case having an insert groove at a central portion thereof; an elastic body in which one surface portion is in close contact with an inner surface of the central portion of the upper case; a spool having a surface on which a nylon cutter is wound and one surface which is in close contact with the other surface portion of the elastic body by pressing; an operating wheel of which one surface portion is coupled to the other surface portion of the spool; and a lower case in which a mounting groove into which the other side portion of the operating wheel is inserted is formed at the center portion and an edge portion is coupled to an edge portion of the upper case.

A trimmer head for use with a handheld lawn maintenance tool is shaped in a hub-and-spoke manner, wherein the trimmer head includes a housing formed of a hub, a circular rim, and a plurality of spokes extending therebetween. A spool is positioned within the hub, and a pair of pieces of trimmer line are inserted into opposing sides of the circular rim through the spokes for winding onto the spool. The trimmer line extends outwardly from the housing at a location spaced away from the hub.