Gripping and cutting apparatus

Abstract

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° 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.

1 . Assembly for insertion in a free end of a tubular boom having annular cross sections comprising, in combination: a tubular insert having first and second ends and an outer surface having annular cross sections of a size corresponding to and for a tight slideable fit within the free end of the tubular boom, with the outer surface of the tubular insert being adapted to be glued or similarly adhered within 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.  
     
     
         2 . The assembly of  claim 1  further comprising, in combination: an end plate secured to the second end of the tubular insert, with the first actuator ears extending from the end plate.  
     
     
         3 . Gripping assembly comprising, in combination: first and second shafts rotatable about first and second, spaced, parallel pivot axes; a first crank arm extending radially from the first shaft; a second crank arm extending radially from the second shaft; an extendable actuator having a first end pivotably mounted to the first crank arm about a third pivot axis and having a second end pivotably mounted to the second crank arm about a fourth pivot axis spaced from and parallel to the first, second, and third pivot axes; at least a first gripping arm extending radially from the first shaft; at least a second gripping arm extending radially from the second shaft; and an abutment located equidistant between but in a plane parallel to but spaced from a plane extending between the first and second pivot axes to limit travel of the crank arms and rotational movement of the first and second shafts.  
     
     
         4 . The gripping assembly of  claim 3  further comprising, in combination: an end plate, with the first and second shafts extending through and being rotatably mounted in apertures formed in the end plate, with the abutment being secured to the end plate.  
     
     
         5 . The gripping assembly of  claim 4  further comprising, in combination: a support extending perpendicularly from the end plate, with the support being parallel to and intermediate the first and second shafts; and first and second pivot brackets extending from the support spaced from the end plate, with the first shaft being pivotably mounted by the end plate and the first pivot bracket, with the second shaft being pivotably mounted by the end plate and the second pivot bracket, with the end plate located intermediate the crank arms and the gripping arms.  
     
     
         6 . The gripping assembly of  claim 5  further comprising, in combination: means for rotationally mounting the support about an axis extending generally perpendicular to the plane extending between the first and second pivot axes.  
     
     
         7 . The gripping assembly of claim G wherein the mounting means comprises a rotary hydraulic actuator.  
     
     
         8 . Apparatus for gripping and cutting attachable to a free end of a boom of a boom assembly, comprising, in combination: a gripping and cutting assembly; and means for mounting the gripping and cutting assembly to the free end of the boom of the boom assembly for pivotable movement about a first axis, a second axis substantially perpendicular to the first axis, and a third axis substantially perpendicular to the first and second axes.  
     
     
         9 . The apparatus of  claim 8  wherein the mounting means provides pivotable movement 360° about one of the first, second, and third axes.  
     
     
         10 . The apparatus of  claim 8  wherein the mounting means comprises, in combination: a leveler mount; a first rotary actuator for rotating the leveler mount about the first axis; a head mount; and a second rotary actuator for rotating the head mount relative to the leveler mount about the second axis.  
     
     
         11 . The apparatus of  claim 10  wherein the leveler mount is generally U-shaped and includes a central plate and first and second end plates extending generally perpendicular from the central plate, with the first rotary actuator received between the end plates and the first axis extending through the end plates; and wherein the second rotary actuator is mounted between the head mount and the central plate; and wherein the head mount is directly secured to the gripping and cutting assembly.  
     
     
         12 . The apparatus of  claim 11  wherein the head mount is pivotable 360° about the second axis.  
     
     
         13 . The apparatus of  claim 11  wherein the mounting means further comprises, in combination: a rotator mount, with the first rotary actuator being mounted to the rotator mount; and means for pivotally mounting the rotator mount to the free end of the boom of the boom assembly for pivotable movement about the third pivot axis.  
     
     
         14 . The apparatus of  claim 13  wherein the boom of the boom assembly is tubular; and wherein the means for pivotally mounting the rotator mount comprises, in combination: a tubular insert having first and second ends and an outer surface having annular cross sections of a size corresponding to and for a tight slideable fit within the free end of the tubular boom, with the outer surface of the tubular insert being adapted to be glued or similarly adhered within 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, with the rotator mount having second pivot ears pivotably mounted to the first pivot ears about the third axis, with the rotator mount having second actuator ears; and an extendable actuator having a first end pivotably mounted to the first actuator ears about a fourth pivot axis spaced from and parallel to the third axis and having a second end pivotably mounted to the second actuator ears about a fifth pivot axis spaced from and parallel to the third and fourth axes and extending within the interior of the tubular insert.  
     
     
         15 . The apparatus of  claim 11  wherein the gripping and cutting assembly comprises, in combination: a saw system of the chain saw type including a bar pivotable about an axis perpendicular to the second axis and in a plane parallel to the second axis.  
     
     
         16 . The apparatus of  claim 15  wherein the gripping and cutting assembly comprises, in combination: first and second shafts rotatable about spaced, parallel pivot axes; a first crank arm extending radially from the first shaft; a second crank arm extending radially from the second shaft; an extendable actuator having a first end pivotably mounted to the first crank arm about a pivot axis and having a second end pivotably mounted to the second crank arm about a pivot axis spaced from and parallel to the pivot axes of the first and second shafts and of the first end of the extendable actuator; at least a first gripping arm extending radially from the first shaft; at least a second gripping arm extending radially from the second shaft; and an abutment located equidistant between but in a plane parallel to but spaced from a plane extending between the pivot axes of the first and second shafts to limit travel of the crank arms and rotational movement of the first and second shafts.  
     
     
         17 . Device for gripping and cutting comprising, in combination: a moveable boom assembly mounted on a vehicle; a gripping and cutting apparatus mounted to the boom assembly, with the gripping and cutting apparatus being pivotably moveable about at least a first pivot axis relative to the vehicle, with the gripping and cutting apparatus including pivotable gripping arms and a saw system; means carried by the vehicle for controlling the operation of the boom assembly, the pivotable movement of the gripping and cutting apparatus, the pivoting of the gripping arms, and the operation of the saw system; a remotely operated control operating the controlling means and which is untethered to the vehicle during operation, with the remotely operated control including a first transmitter, and the controlling means including a first receiver for receiving control transmissions from the first transmitter.  
     
     
         18 . The gripping and cutting device of  claim 17  wherein the saw system includes a sensor for detecting an operational mode of the saw system, with the controlling means including an interlock for preventing operation of the boom assembly when the operational mode of the saw system is detected by the sensor.  
     
     
         19 . The gripping and cutting device of  claim 18  further comprising, in combination: a second transmitter carried by the saw system for providing a signal when the operational mode is detected; and a second receiver for receiving the signal provided by the second transmitter for controlling the interlock.  
     
     
         20 . Device for cutting comprising, in combination: a moveable boom assembly mounted on a vehicle; a cutting apparatus mounted to the boom assembly, with the cutting apparatus including a sensor for detecting an operational mode of the cutting apparatus; and means for controlling the operation of the boom assembly and the operation of the cutting apparatus, with the controlling means including an interlock for preventing operation of the boom assembly when the operational mode of the cutting apparatus is detected by the sensor.  
     
     
         21 . Method of cutting comprising: moving a boom assembly; moving a saw system relative to the boom assembly between a home position and outside the home position; sensing whether the saw assembly is in the home position or outside the home position; and preventing moving of the boom assembly when the saw assembly is sensed outside the home position.  
     
     
         22 . Method of cutting tree limbs from around electrical lines comprising; moving a boom assembly including a saw system for cutting the tree limbs and means for controlling the movement of the boom assembly; and manipulating a control operating the controlling means and which is not connected to the boom assembly in a manner which creates an electrical path from the electrical lines to ground.  
     
     
         23 . The method of  claim 22  wherein manipulating the control comprises manipulating the control which is untethered to the boom assembly during operation.