A saw bar clamping mechanism, length measuring mechanism, system for measuring the length of a tree stem, feed roller mechanism, pin retention mechanism, and a tree processor attachment comprising at least one of the mechanisms and/or system is provided. The saw bar mechanism simultaneously unclamps a saw bar and releases a saw chain for convenient removal. The length measuring mechanism comprises a measuring wheel operable to extend and retract perpendicularly to a tree stem. The feed roller mechanism includes first-side and second-side rollers, and a bearing having outer and inner sides, the bearing being rotatably coupled at its outer side to the first-side roller and rotatably coupled at its inner side to the second-side roller, the bearing making angular contact. The pin retention mechanism includes a two-part collar fitting into a groove with interference for locking a nut received by the collar.

A tree shear head assembly is comprised of a connecting frame which provides connecting sections, one of which is angulated at a specific angle to connect to a boom of a motorized vehicle. The connecting frame has a shear structure secured to a lower connecting wall thereof and additional connecting sections for attachment of at least one of a clamping grapple and a tree trunk support fork secured to a support column. The shear structure has a blade which co-acts with a channel formed between gripping plates to immovably arrest a tree trunk being cut by the blade with a slicing action to prevent shattering of the trunk and damage to the tree fibers thereby achieving a clean cut. Different combinations of the shear head assembly with the clamping grapple and/or the tree support fork are easily adapted in combination with the tree shear head assembly.

A tree shear head assembly is comprised of a connecting frame which provides connecting sections, one of which is angulated at a specific angle to connect to a boom of a motorized vehicle. The connecting frame has a shear structure secured to a lower connecting wall thereof and additional connecting sections for attachment of at least one of a clamping grapple and a tree trunk support fork secured to a support column. The shear structure has a blade which co-acts with a channel formed between gripping plates to immovably arrest a tree trunk being cut by the blade with a slicing action to prevent shattering of the trunk and damage to the tree fibers thereby achieving a clean cut. Different combinations of the shear head assembly with the clamping grapple and/or the tree support fork are easily adapted in combination with the tree shear head assembly.

A device for deflecting a detached cutting chain off the drive sprocket of a chain saw in order to deenergize and arrest it. A ramp provides a surface disposed below the chain guide bar, which surface is oblique with respect to the chain guide bar, slightly below a lower edge of the chain guide bar and obliquely angled with respect to a plane that contains the exterior surface of the chain guide bar, and distal to the drive sprocket. Sliding engagement of a detached cutting chain with the oblique surface moves the cutting chain exteriorly away from the chain guide bar and off the drive sprocket. A chain catcher is also provided to arrest the detached cutting chain and/or chain shot portions thereof.

A device for deflecting a detached cutting chain off the drive sprocket of a chain saw in order to deenergize and arrest it. A ramp provides a surface disposed below the chain guide bar, which surface is oblique with respect to the chain guide bar, slightly below a lower edge of the chain guide bar and obliquely angled with respect to a plane that contains the exterior surface of the chain guide bar, and distal to the drive sprocket. Sliding engagement of a detached cutting chain with the oblique surface moves the cutting chain exteriorly away from the chain guide bar and off the drive sprocket. A chain catcher is also provided to arrest the detached cutting chain and/or chain shot portions thereof.

A device (4200) for an Unmanned Aerial Vehicle, UAV (100), said device (4200) comprising a first pivot point (4212) and a second pivot point (4214) being spaced apart from each other, said first pivot point (4212) is connectable a UAV (100) and said second pivot point (4214) is connectable the UAV (100), said device (4200) is configured to be tilted/rotated around said first pivot point (4212) by adjusting a length of a second cord (4204) and/or tilted/rotated around said second pivot point (4214) by adjusting a length of a first cord (4202), wherein said device (4200) has a first winch motor (4292) and a second winch motor (4294), said first and second winch motors (4292, 4294) are configured for adjusting the length of said first and second cords (4202, 4204) respectively. Also provided is a harvesting tool (105, 110) comprising a base structure (650), said base structure having attached to it at least one cutting means for delimbing a tree (114a, 114b), at least one means for communicating with a UAV and/or a remote base station, at least one cutting means for cutting a tree trunk (116), at least one attaching means to be attachable to the UAV (660), at least one holding means for holding a tree trunk (105,107a, 107b, 114a, 114b). Also provided is a method for controlling the relative rotation between a UAV and a device, where the device is attached to said UAV via at least two cords, said method comprising the steps of: a. determining a reference rotational position of said device relative to said UAV, b. detecting an angular rotation R in a horizontal plane of said device relative to said reference position, c. compensating said angular rotation in said horizontal plane of said device by rotating said UAV in said horizontal plane in the same direction and by the same angular rotation R as said device for prohibiting twisting of said cords.

An airborne grapple saw system includes a suspension assembly, a hydraulic power pack assembly, and a grapple saw head assembly. The suspension assembly is configured to be suspended from an aerial vehicle. The hydraulic power pack assembly is operatively coupled with the suspension assembly. The grapple saw head assembly is operatively coupled with the hydraulic power pack assembly. The grapple saw head assembly is configured to freely rotate about a vertical axis an unlimited number of revolutions. The grapple saw head assembly includes a saw and first and second grapple arms. The grapple arms are pivotable between an open configuration, where the grapple arms are configured to obtain and release the vegetation, and a closed configuration, where the grapple arms are configured to securely retain the vegetation.

An airborne grapple saw system includes a suspension assembly, a hydraulic power pack assembly, and a grapple saw head assembly. The suspension assembly is configured to be suspended from an aerial vehicle. The hydraulic power pack assembly is operatively coupled with the suspension assembly. The grapple saw head assembly is operatively coupled with the hydraulic power pack assembly. The grapple saw head assembly is configured to freely rotate about a vertical axis an unlimited number of revolutions. The grapple saw head assembly includes a saw and first and second grapple arms. The grapple arms are pivotable between an open configuration, where the grapple arms are configured to obtain and release the vegetation, and a closed configuration, where the grapple arms are configured to securely retain the vegetation.

A felling unit and a method of harvesting small-dimensioned wood in a forest. A felling unit comprises a cutting device with two disc blades and a cutting gap between them for cutting small-dimensioned trees. The cut small-dimensioned trunks are transferred from the cutting gap to a temporary storage space by means of a transfer device comprising two transfer shafts with a transfer gap between them. The disc blades and the transfer shafts are both rotated in opposite directions relative to each other, i.e. towards the cutting gap and the feeding gap.

A felling unit and a method of harvesting small-dimensioned wood in a forest. A felling unit comprises a cutting device with two disc blades and a cutting gap between them for cutting small-dimensioned trees. The cut small-dimensioned trunks are transferred from the cutting gap to a temporary storage space by means of a transfer device comprising two transfer shafts with a transfer gap between them. The disc blades and the transfer shafts are both rotated in opposite directions relative to each other, i.e. towards the cutting gap and the feeding gap.