An improved cutter assembly for use with a header of an agricultural harvester is provided. The assembly includes a pair of oppositely directed knife blades or cutter bars and a center knife drive. A crank shaft drives both knife blades in linear reciprocating paths with no fore and aft movement. As a consequence, harmful fore and aft vibration is eliminated. The assembly is simple and durable in design, less susceptible to vibration-induced wear and tear, and comparatively simple to manufacture and repair.

A cleaning system of a header for an agricultural vehicle. The header includes a frame with a floor having at least one cutout therein. The cleaning system includes at least one door, an elongated member operably connected to the at least one door, and at least one actuator connected to the elongated member. The elongated member is rotatable by the at least one actuator to slide the at least one door between a first position for covering the at least one cutout and a second position for at least partially uncovering the at least one cutout and allowing an unwanted material to pass through the at least one cutout.

A cleaning system of a header for an agricultural vehicle. The header includes a frame with a floor having at least one cutout therein. The cleaning system includes at least one door, an elongated member operably connected to the at least one door, and at least one actuator connected to the elongated member. The elongated member is rotatable by the at least one actuator to slide the at least one door between a first position for covering the at least one cutout and a second position for at least partially uncovering the at least one cutout and allowing an unwanted material to pass through the at least one cutout.

A lawn mower includes: a rotation shaft coupled to a power source and extending in an approximately vertical direction a blade configured to rotate integrally with the rotation shaft and a housing having a downward opening and accommodating the blade such that the blade is rotatable; and a maintenance tool provided on the housing, the maintenance tool being contactable with the blade from the above. A cutting portion of the blade is capable of moving between a maintenance position at which the cutting portion is contactable with the maintenance tool and an operating position at which the cutting portion mows a lawn.

A lawn mower includes: a rotation shaft coupled to a power source and extending in an approximately vertical direction a blade configured to rotate integrally with the rotation shaft and a housing having a downward opening and accommodating the blade such that the blade is rotatable; and a maintenance tool provided on the housing, the maintenance tool being contactable with the blade from the above. A cutting portion of the blade is capable of moving between a maintenance position at which the cutting portion is contactable with the maintenance tool and an operating position at which the cutting portion mows a lawn.

A ground contour sensing system and method for a vehicle with a mowing head. The system includes a sensor system that measures a ground contour in front of the mowing head, and generates contour measurement signals; and a controller that determines whether to move the mowing head based on the contour measurement signals, and generates movement commands for the mowing head when it determines to move the mowing head. The mowing head can include tilt and lift cylinders, and the controller can determine whether to move the mowing head using the tilt or lift cylinders. The sensor system can include a pivot arm that moves in response to changes in the ground contour, and an angle sensor that measures an angle of the pivot arm. There can be one or more sensor systems positioned between the right and left sides of the mowing head.

Apparatus and methods for revitalizing artificial turf fields are disclosed. In one exemplary apparatus, the apparatus may comprise a support frame, a plurality of shearing machines installed on the support frame, and a plurality of wheels installed on the support frame. The support frame may be configured to position the shearing machines parallel to each other to tilt the shearing machines with respect a surface of the artificial turf field, and to position the shearing machines above a surface of the field at a distance such that the shearing machines cut fibers to produce trimmed fibers that have a length that can extend above infill or topmost layer of the artificial turf field. Methods for revitalizing artificial turf fields using the same are also disclosed.

An improved cutter assembly for use with a header of an agricultural harvester is provided. The assembly includes a pair of oppositely directed knife blades or cutter bars and a center knife drive. A crank shaft drives both knife blades in linear reciprocating paths with no fore and aft movement. As a consequence, harmful fore and aft vibration is eliminated. The assembly is simple and durable in design, less susceptible to vibration-induced wear and tear, and comparatively simple to manufacture and repair.

An improved cutter assembly for use with a header of an agricultural harvester is provided. The assembly includes a pair of oppositely directed knife blades or cutter bars and a center knife drive. A crank shaft drives both knife blades in linear reciprocating paths with no fore and aft movement. As a consequence, harmful fore and aft vibration is eliminated. The assembly is simple and durable in design, less susceptible to vibration-induced wear and tear, and comparatively simple to manufacture and repair.

An apparatus for revitalizing artificial turf fields may comprise a support frame, a plurality of shearing machines installed on the support frame, and a plurality of wheels installed on the support frame. The support frame may be configured to position the shearing machines parallel to each other, to tilt the shearing machines with respect a surface of the artificial turf field, and to position the shearing machines above a surface of the field at a distance such that the shearing machines cut fibers to produce trimmed fibers that have a length that can extend above infill or topmost layer of the artificial turf field. Methods for revitalizing artificial turf fields involves the aforementioned apparatus.