초록 ▼

An airborne tree trimming apparatus for installation on a helicopter or the like, and operating independently of the helicopter, which apparatus includes a boom extension vertically suspended from the helicopter and a plurality of circular saw blades arranged in tandem, coplanar relationship on an o

An airborne tree trimming apparatus for installation on a helicopter or the like, and operating independently of the helicopter, which apparatus includes a boom extension vertically suspended from the helicopter and a plurality of circular saw blades arranged in tandem, coplanar relationship on an operating boom which is attached to the boom extension by means of a boom pivot. The circular saw blades are designed to rotate about parallel, substantially horizontal axes which are oriented substantially at right angles to the normal direction of motion of the helicopter and are belt-driven by an internal combustion engine which is also mounted on the operating boom, above the circular saw blades. A pair of ground-located cradles not attached to the operating boom, permit the apparatus to be landed with the operating boom elevated from ground level, by maneuvering the helicopter to lay the operating boom and circular saw blades on the cradles in front of the helicopter. An optional quick-release hook engaging the top of the boom structure and mounted on the helicopter permits the apparatus to be jettisoned in an emergency while the helicopter is airborne.

대표청구항 ▼

Airborne helicopter-mounted tree trimming apparatus for use with a helicopter having a selected cargo lift capacity, said apparatus comprising boom mounting structure attached to the underside of said helicopter near the center of lift thereof: a first boom pivotally mounted to said boom mounting st

Airborne helicopter-mounted tree trimming apparatus for use with a helicopter having a selected cargo lift capacity, said apparatus comprising boom mounting structure attached to the underside of said helicopter near the center of lift thereof: a first boom pivotally mounted to said boom mounting structure about a pivot axis which is horizontal and transverse to the principal direction of flight of said helicopter, said first boom being restrained from substantial rotation about its longitudinal axis: a second boom hingedly connected to the lower end of said first boom; a plurality of circular saw blades rotatably mounted in tandem relationship on said second boom for rotation about axes which are parallel to said pivot axis, said circular saw blades oriented substantially in a common plane; an internal combustion engine carried by said second boom; and power transmission means connecting said internal combustion engine to said circular saw blades for rotating said circular saw blades at a selected speed responsive to operation of said internal combustion engine.