A method and apparatus are provided for vertically felling trees by taking apart the trunk in a stepwise manner combining sagittal and horizontal cross-sections. A vertical frame is attachable to a tree trunk, the vertical frame having a movable portion and a fixed portion. A first cutting device is attachable to the vertical frame and configured to cut the tree sagittally substantially along a longitudinal axis of the tree. A second cutting device is attachable to the vertical frame and configured to cut the tree horizontally from an exterior of the tree to a sagittal cut made in the tree by the first cutting device. A locking mechanism releasably locks the movable portion of the frame to the fixed portion of the frame. The apparatus uses the weight of the upper trunk to maintain stability to steadily decrease the tree height until the entire tree is removed.

A stop has an elongate form between a base and a tip, with the base configured to be attachable to a chainsaw bar closer to a free end of the bar then to a housing of the chainsaw to which the bar is mounted. The stop extends below a lower edge of the bar. Bolts or other fasteners pass through holes in the stop and through holes in the bar for attachment. Positioning of the stop separates a tip space from a main space where chain teeth can cut wooden material. Smaller branches can conveniently be cut in the tip space while larger wooden material can be cut in the main space. The stop is configured to include clearance for the chain to pass thereby, such as by including standoffs in the stop adjacent to holes at the base, or by providing a clearance groove or clearance bend.

Short chainsaw bar assemblies, methods for using a chainsaw motor to operate an accessory, chainsaw drive chain cooling assemblies, methods for cooling a chainsaw drive, chainsaw motor drive adapter assemblies, methods for powering a belt drive from a chainsaw, and chainsaw and accessory assemblies are provided.

A handheld cutting tool includes a motor, a driven gear coupled to the motor for receiving torque therefrom and a sprocket coupled for co-rotation with the driven gear, a handle guard extending from handle portion, a chain supported on a guide bar and engaged with the sprocket such that rotation of the sprocket moves the chain along the guide bar, and a battery pack removably coupled to an end of the handle portion. The handle guard includes a support face configured to support the handheld cutting tool on a horizontal support surface, and the battery pack includes a foot portion. A center of gravity of the handheld cutting tool is located above the foot portion and permits balancing of the handheld cutting tool in an upright position on only the foot portion.

A cutting tool that contains the cutting forces within its assembly. The cutting tool includes an outside housing that attaches multiple jaws, attachment points for jaw clamping, anchor point to secure clamping forces, a bearing surface to allow saw bar movement, handles for user movement, and protection for internal components used in its operation. The jaws include interlocking gears to synchronize rotation, cross bracing, jaw clamping attachments points, and tie-offs for hoisting rope. The saw bar and chain electric motor attach to a rotation tube that is rotated by a worm gear situated at opposite end. Electrical power contained within the main housing is transferred to electrical chain motor using an electric rotary joint. The electric batteries and electric motor controller, electrical power switch and electrical fuse is contained within the main housing. Electro-pneumatic valves are situated in a separate housing and used for chain motor activation.

A stop has an elongate form between a base and a tip, with the base configured to be attachable to a chainsaw bar closer to a free end of the bar than to a housing of the chainsaw. The stop extends below a lower edge of the bar. Fasteners pass through holes in the stop and through holes in the bar for attachment. Positioning of the stop separates a tip space from a main space where chain teeth can cut wooden material. Smaller branches can conveniently be cut in the tip space while larger wooden material can be cut in the main space. The stop is configured to include clearance for the chain to pass thereby, such as by including standoffs adjacent to holes at the base, or by providing a clearance groove or bend. The stop can include a hook to facilitate engagement with and moving of small objects.

The description herein discloses a chainsaw, which may include: a saw chain; a guide bar equipped with the saw chain; a sprocket for running the saw chain along a periphery of the guide bar; a motor including an output shaft connected to the sprocket; a cooling fan connected to the output shaft; and a base member for holding the guide bar. The base member may be constituted of a heat conductive material having a thermal conductivity of 10 W/m•K or more when a temperature of the heat conductive material is 300 K. The base member may include: a plate portion arranged such that the plate portion faces the motor in a direction along the output shaft; and a rib portion protruding from the plate portion toward the motor.

The description herein discloses a chainsaw, which may include: a saw chain; a guide bar equipped with the saw chain; a sprocket for running the saw chain along a periphery of the guide bar; a motor including an output shaft connected to the sprocket; a cooling fan connected to the output shaft; and a base member for holding the guide bar. The base member may be constituted of a heat conductive material having a thermal conductivity of 10 W/m•K or more when a temperature of the heat conductive material is 300 K. The base member may include: a plate portion arranged such that the plate portion faces the motor in a direction along the output shaft; and a rib portion protruding from the plate portion toward the motor.

A method for operating a saw assembly as well as a saw assembly, having a chainsaw (1) with a circulating saw chain (2) and a chain drive sprocket (3) for driving the saw chain (2). The chainsaw (1) is secured to a moving device (8) via a chainsaw swivel device (19). The moving device (8) has a first operating mode, in which the chainsaw (1) is moved or movable from a first position through a saw area (9) and through the cutting material (18) into a second position, and the moving device (8) has a second operating mode, in which the chainsaw (1) is moved or movable from the second position back through the saw area (9) and through the cutting material (18) into the first position.

A method for operating a saw assembly as well as a saw assembly, having a chainsaw (1) with a circulating saw chain (2) and a chain drive sprocket (3) for driving the saw chain (2). The chainsaw (1) is secured to a moving device (8) via a chainsaw swivel device (19). The moving device (8) has a first operating mode, in which the chainsaw (1) is moved or movable from a first position through a saw area (9) and through the cutting material (18) into a second position, and the moving device (8) has a second operating mode, in which the chainsaw (1) is moved or movable from the second position back through the saw area (9) and through the cutting material (18) into the first position.