초록 ▼

Apparatus (10) having special application for gripping and cutting tree limbs around utility lines includes a tubular insert (18) slideably received in the free end of a tubular boom (12). A plate (28) is pivoted about a first pivot axis relative to the insert (18) by a linearly extendable actuator

Apparatus (10) having special application for gripping and cutting tree limbs around utility lines includes a tubular insert (18) slideably received in the free end of a tubular boom (12). A plate (28) is pivoted about a first pivot axis relative to the insert (18) by a linearly extendable actuator (36) mounted within the insert (18) and mounts a first rotary actuator (38). A second rotary actuator (58) is mounted to a U-shaped mount (48) which is pivoted about a second pivot axis to the first rotary actuator (38) and rotates a working head (96) 360.degree. about a third pivot axis. Gripping arms (78) are fixed to shafts (74) rotatably mounted in the working head (96) about axes perpendicular to the third axis, with the shafts (74) being rotated by a single linearly extendable actuator (82) extending between crank arms (80) fixed to the shafts (74). The crank arms (80) abut with an abutment (84) to prevent only one set of gripping arms (78) from moving. An untethered remote control unit (112) is provided to prevent the creation of an electrical path to ground through the operator. A solar and battery-powered transmitter (144) mounted on the head (96) sends an electromagnetic signal to prevent actuation of the valves (101-103) controlling the operation of the boom assembly (14) when the saw bar (88) is not in its home position.

대표청구항 ▼

1. Apparatus for gripping and cutting attachable to a free end of a tubular boom of a boom assembly, with the tubular boom having annular cross sections, comprising, in combination: a gripping and cutting assembly; a tubular insert having first and second ends and an outer surface having annular cro

1. Apparatus for gripping and cutting attachable to a free end of a tubular boom of a boom assembly, with the tubular boom having annular cross sections, comprising, in combination: a gripping and cutting assembly; a tubular insert having first and second ends and an outer surface having annular cross sections of a size corresponding to and for a slideable fit within the free end of the tubular boom; first pivot ears formed on the first end of the tubular insert; first actuator ears secured in the tubular insert spaced from the first end; a mount having second pivot ears pivotably mounted to the first pivot ears about a first pivot axis, with the mount having second actuator ears; and an extendable actuator having a first end pivotably mounted to the first actuator ears about a second pivot axis spaced from and parallel to the first pivot axis and having a second end pivotably mounted to the second actuator ears about a third pivot axis spaced from and parallel to the first and second pivot axes and extending within the interior of the tubular insert, with the gripping and cutting assembly being mounted to the mount for pivotable movement about a fourth axis substantially perpendicular to the first pivot axis and a fifth axis substantially perpendicular to the first pivot axis and the fourth pivot axis.