One apparatus includes a processor and a radio transceiver that receives a set of reference signals transmitted from transmission point. The processor selects a subset of beams from a plurality of orthogonal beams based on the received set of reference signals and computes sets of amplitude and phase parameters for one or more channel compression matrices. In some embodiments, each channel compression matrix corresponds to one transmission layer of a multiple-layer transmission and each channel compression matrix is comprised of one or more column vectors. The processor controls the radio transceiver to send indications of the sets of amplitude and phase parameters.

A mower and an attachment device or mount having a frame attachment clamp to removeably affix to the wheel support frame, a pivotable linkage arrangement to position a string trimmer proximate either front wheel of the lawnmower, and a grade wheel to maintain a designated height of string trimmer above grade. The attachment device or mount may enable the operator to attach the frame attachment clamp to either front wheel enabling the operator to look ahead and anticipate where the lawnmower needs to be driven and simultaneously to position the string trimmer for trimming and edging operation around landscapes and borders on either the left or right side of the lawnmower.

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 use in controlling the driving device. The trimming head includes a spool and a line holding element 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 element to make the spool and the line holding element rotate relatively so that a trimming line is wound on the spool automatically.

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 trimmer head assembly for a trimming machine. The trimmer head assembly includes a spool. The spool has a central tubular hub. The spool also has a central flange that radially extends from the hub. A trim line conduit is joined to the central flange. The trim line conduit has a first open end. The first open end leads to a first straight section. The first straight section leads to a curved central section. The curved central section leads to a second straight section. The second straight section leads to a second open end. The curved central section passes around the center of the spool. A housing is provided that receives the spool therein. When loading trimmer line into the trimmer head assembly, the shaped of the conduit enables the trimmer line to pass around the central opening in the spool without binding.

Systems and methods which provide force amplified fastener assemblies configured for use with respect to detachable implements for power tools are described. Force amplified fastener assemblies may implement various gear train configurations for giving a mechanical advantage with respect to manual manipulation of the fastener assembly. A force amplified fastener assembly may include a lock mechanism operative to lock and/or unlock the force amplified fastener assembly and thus a fastening element thereof. In some examples, a force amplified fastener assembly may include a grasping member assembly for facilitating manual application of torque. Additionally or alternatively, a force amplified fastener assembly may include a removable and replaceable external surface covering configured to protect at least a portion of the force amplified fastener assembly. Force amplified fastener assemblies of embodiments of the invention may be utilized in place of a conventional lock nut for affixing detachable implements to power tools.

Systems and methods which provide force amplified fastener assemblies configured for use with respect to detachable implements for power tools are described. Force amplified fastener assemblies may implement various gear train configurations for giving a mechanical advantage with respect to manual manipulation of the fastener assembly. A force amplified fastener assembly may include a lock mechanism operative to lock and/or unlock the force amplified fastener assembly and thus a fastening element thereof. Force amplified fastener assemblies of embodiments of the inventions may be utilized in place of conventional lock nut for affixing detachable implements to power tools.

A weed trimmer mount assembly includes a mount that is attachable to a mounting location of a riding lawn mower. An arm is pivotally attached to the mount thereby facilitating the arm to be accessible to a rider of the riding lawn mower. The arm is positionable between a deployed position and a stored position. A weed trimmer is coupled to the arm and the weed trimmer is positioned adjacent to the ground when the lever is positioned in the deployed position thereby facilitating the weed trimmer to be oriented for trimming weeds on the ground. The weed trimmer is lifted from the ground when the lever is positioned in the stored position thereby facilitating the riding lawn mower to be operated in a normal manner. A speed control is mounted to the riding lawn mower for adjusting an operational speed of the weed trimmer.

Ergonomic gripping mechanisms of battery-operated electric cutting apparatus are provided. The electric cutting apparatus may include a cantilevered cutting head, an adjustable telescoping shaft, a rear grip portion, a pistol grip, and a forearm shaft. The adjustable telescoping shaft may be pivotally connected to the cantilevered cutting head. The rear grip portion may have a first end connected to the adjustable telescoping shaft. The pistol grip may have a first end extending at a first angle from the second end of the rear grip portion. The forearm shaft may extend from the second end of the pistol grip at a second angle. The forearm shaft may have a top side comprising a forearm pad having an exterior surface configured to receive a forearm of a user. The exterior surface of the forearm pad may be parallel to an axis defined by a longitudinal extension of the adjustable telescoping shaft.

A trimmer head assembly for a trimming machine. The trimmer head assembly includes a spool. The spool has a central tubular hub. The spool also has a central flange that radially extends from the hub. A trim line conduit is joined to the central flange. The trim line conduit has a first open end. The first open end leads to a first straight section. The first straight section leads to a curved central section. The curved central section leads to a second straight section. The second straight section leads to a second open end. The curved central section passes around the center of the spool. A housing is provided that receives the spool therein. When loading trimmer line into the trimmer head assembly, the shape of the conduit enables the trimmer line to pass around the central opening in the spool without binding.