Abstract: A tree harvesting system includes a loader and a delimber. A camera system mounted on the delimber permits an operator to view an interaction area between a delimbing saw or toping saw and the tree being cut while the operator remains safely in a cab of the loader. The camera system provides image data to a display system located in the cab of the loader, and the image data may be viewed and/or processed to provide information about the interaction area, physical data about the tree, or some combination thereof. Advantageously, the tree harvesting system may allow for more accurate saw cuts at a preferred location of the tree, which in turn may result in a higher dollar amount and more efficient distribution of sticks to the mills.

Abstract: According to an aspect of the present disclosure, a disk saw felling head has a fore-aft dimension, a lateral dimension, and a vertical dimension such that the fore-aft dimension, the lateral dimension, and the vertical dimension are perpendicular to one another. The disk saw felling head comprises a frame comprising a first mounting post, a second mounting post, a motor housing, and a horn section, The first and second mounting posts are configured for attaching the disk saw felling head to a base machine and spaced laterally apart from one another relative to the lateral dimension and extending vertically relative to the vertical dimension. The horn section is mounted to a top portion of the first mounting post and a top portion of the second mounting post relative to the vertical dimension.

Abstract: A portable and remotely controlled motor and chain/bar apparatus that can trim limbs in excess of about 60 feet from the ground level in an extremely safe manner. An operator on the ground can remove a limb from a safe distance exceeding about 50 feet from where the limb would fall or be lowered to the ground. A motorized chain/bar assembly is secured to a small platform which can easily be lifted for tree delimbing. For safety and stability, the chain/bar cutting platform is secured to all sides of the limb to be cut. Once in position, the operator by applying power to the unit, starts the cycle as the motor chain/bar carriage travels to the top of the platform, the motor/chain/bar rotates from a vertical to a horizontal position and as the motor chain/bar is engaged it travels in a downward motion towards the lower section of the platform creating the pressure required to complete the delimbing process.

Abstract: A winch system 10 coupled to a processor energy source 12 having multiple processor driving rollers 14. The processor 12 provides energy to the winch system 10. The winch system has a body 18 with a front face 20, a back face 22, lateral sides 24, a top 26, a bottom 28 and an imaginary vertical axis A-A. Multiple driven winch drive rollers 32 are supported by the body 18 so that they are rotatable about axes that are parallel to the vertical axis in response to the multiple processor driving rollers. A winch drum 36 is attached to the body 18. A drum gear 38 influences the speed and direction of winch drum rotation. Attached to the winch drum is a cable 40 having a proximal end 42 region and a distal end region that is detachably attachable to an object 46 to be retrieved by the winch system. The cable extends outwardly from the front 20 or back faces 22 of the body 18.

Abstract: A multi-axis controlled self-climbing tree trimmer used for shaping and severing peripheral growth from a tree is provided herein. The trimmer typically includes a structural segment hinged together to form a rigid chassis that surrounds a tree trunk climbing segment and a trimming portion. The climbing portion is retained within the structural segment in the form of a number of inward-extending carriages containing one or more rollers for gripping the tree trunk during climbing, and the trimming portion may include a rotatable split ring gear containing centrifugally rotating trimming blade members and/or a cutting tool on a positionable arm. When rotated, the blade members unlatch and pivot, into the trunk of the tree to effect controlled trimming. The system may utilize a multi-axis control system that uses linear interpolation, circular interpolation and coordination of all axes to enable the trimmer to follow an XYZ contour selected by a user.

Abstract: The object of the invention is a method and an apparatus for cutting a tree. In the method a delimbing & crosscut device cutting branches and able to cut the trunk of a tree is controlled upwards along the trunk of a tree intended to be removed and when it ascends to cut the branches of the tree that are in its way. The delimbing & crosscut device is controlled to ascend and descend along the trunk of the tree step-by-step by alternately increasing and shortening the length of the delimbing & crosscut device.

Abstract: The object of the invention is a method and an apparatus for conveying tools to a work site along an elongated object, such as along a pillar, a post, a beam or a tree. The apparatus is provided with at least a control system and comprises at least a work device connected to the control system and moving along an elongated object, said work device comprising a frame and moving means for controlling the work device up and down along the elongated object. The frame of the work device consists of two frame halves to be disposed around the elongated object and to be locked to each other, to which frame halves a tool base is fixed for at least the tools needed at the work site.

Abstract: A machine for processing trees includes a trailer; a loader and a tree processing unit mounted on the trailer. The tree processing unit is configured to independently process loaded trees.

Abstract: A tree harvesting system includes a loader and a delimber. A camera system mounted on the delimber permits an operator to view an interaction area between a delimbing saw or toping saw and the tree being cut while the operator remains safely in a cab of the loader. The camera system provides image data to a display system located in the cab of the loader, and the image data may be viewed and/or processed to provide information about the interaction area, physical data about the tree, or some combination thereof. Advantageously, the tree harvesting system may allow for more accurate saw cuts at a preferred location of the tree, which in turn may result in a higher dollar amount and more efficient distribution of sticks to the mills.

Abstract: A method for cutting a branch from a tree using a blade, the branch extending outwardly from a main tree portion, the method comprising: positioning the blade substantially adjacent to the branch and substantially perpendicular thereto; and moving the blade transversely across the branch to cut the branch. Moving the blade transversely across the branch includes moving the blade along a curved path, the curved path being concave in a direction facing the main tree portion. Also, a tree pruning head for performing the method.

Abstract: A cutting bit for a pruning tool includes an elongate body having a first end and a second end. At least one flute extends at least part of a distance between the first end and the second end of the elongate body. A shank is located at the first end of the elongate body and is adapted for connection to an associated pruning tool. The second end of the elongate body defines a boring tip.

Abstract: A tree trimming method that is related to a convex method of pre-determined angular trimming of deciduous trees. The methodology uses pre-determined angle cuts for deciduous vegetation to re-orient new growth and shape shade trees, shrubs and ornamental trees. This pre-determined “convex cut” makes the curved cuts reorient the tree limbs to a pre-desired radial shape and encourages the tree limbs to re-orient and grow. This results in the deciduous tree canopy that is round or radial in shape. The pre-determined angle cutting proves useful for either on the outside perimeter or for clearing inside the tree canopy for power lines. Essentially any pre-determined angle of clearing or directional shaping to re-orient new growth can be done with this cutting method.

Abstract: Disclosed herein is an apparatus preferably coupled to a boom on a truck, the apparatus capable of a plurality of configurations for a variety of uses. In one configuration, the apparatus can perform rapid semi-precise cutting of vegetation. In another configuration, the apparatus can perform more precise trimming of one or more areas (e.g., limbs) and optionally use a limb clamp to prevent cut limbs/vegetation from arbitrarily falling on objects below the cutting area. In yet another configuration, the apparatus can have a grapple or similar device attached to the end of the boom for use in relocating debris or for loading debris into a removal facility such as dump or garbage truck. In each configuration, the apparatus comprises one or more rotatable or pivoting couplings to allow for rotation about one or more axis and therefore allow precise manipulation from an operator in the vehicle or on the ground.

Abstract: Disclosed herein is an apparatus preferably coupled to a boom on a truck, the apparatus capable of a plurality of configurations for a variety of uses. In one configuration, the apparatus can perform rapid semi-precise cutting of vegetation. In another configuration, the apparatus can perform more precise trimming of one or more areas (e.g., limbs) and optionally use an aerial tank mounted at the far end of a boom assembly. Typically the aerial tank will be mounted just beneath the attachment of the cutter head assembly to the boom and above one or more insulation couplings. In some disclosed embodiments, the aerial tank that can be remotely controlled. The aerial tank can be used as a liquid chemical supply or cleaning liquid supply as needed for various tree trimming tasks.

Abstract: A friction brake which is suitable for applying friction to one or more load-bearing ropes in the implementation of arbor rigging or other procedures in some embodiments includes a tree engaging frame, a frame attachment mechanism carried by the tree engaging frame, a shaft receptacle carried by the tree engaging frame, an assembly mount shaft releasably inserted in the shaft receptacle and a rope engaging frame carried by the assembly mount shaft.

Abstract: Method and device for delimbing a tree trunk (60) in a compliant gripping state defined by a set of limbing knives (18, 24, 26, 28) enclosing the trunk. The limbing knives are repeatedly adjusted through a control unit (46) for adaption of the gripping state to a varying thickness of the trunk when the trunk is advanced between the knives for the delimbing of the trunk. The invention comprises entering a desired compliance (D1) of the gripping state in the control unit (46), detecting an actual compliance (d) of the gripping state, and performing each adjustment of the limbing knives via the control unit until the actual compliance (d) corresponds to the desired compliance (D1).

Abstract: A novel tree trimming system includes a crane which lifts a wood working implement and a tree trimmer together over obstacles if necessary to a location where a tree is to trimmed. The tree trimmer may cut limbs and feed them directly into the wood working implement that is mounted just beneath him or may drop them to the ground or fasten them to holders that have been lifted with the tree trimmer by the crane. On the ground, a cart which may be motor driven by hydraulic motors or manually moved or pulled by another vehicle can be retracted to fit through ordinary garden gates. The retraction may include moving the wheels or tracker treads of the cart together and moving the hydraulic motor outside of the space between tractor treads so that the tractor treads may be moved closer together. Moreover, side members may be folded upwardly to compress material on the top of the cart and extensions moved in place at the front and end of the cart to increase load carrying capacity.

Abstract: “A tree trimming device that automatically climbs a tree or other vertical member and shears limbs or debris as it climbs has an anchor structure with substantially horizontal clamps, a cutting assembly with substantially horizontal clamps, vertical connecting pistons, and a cutting blade assembly.

Abstract: A system for measuring the length of a tree being processed through a delimber including a log feed roller mechanism for moving the tree, a delimbing head for delimbing the tree that is movable in a forward and reverse direction relative to the log feed roller mechanism, a measuring wheel resiliently mounted on the delimbing head, and a trimsaw movably mounted on the delimbing head. The length of the processed tree extending beyond the delimbing head may be calculated from signals encoded by the log feed roller mechanism and the measuring wheel. Logs may be cut from the tree by the trimsaw. Two photosensors located at known positions may be used to calculate the total length of the tree.

Abstract: An essential oil reclaim method for use with a corresponding apparatus, comprising the following steps: the apparatus grabs the tree parts, the tree tops or the tree limbs, and shakes them with rotating drums provided with chains (under whiplash effect); the needles are segregated through a vibrating sieve; the needles are compressed for a first essential oil extraction under mechanical compression; the needles are then pushed into a sealed chamber comprising an endless screw which upwardly conveys the needles; steam is sprayed on the needles, so as to thermally extract essential oils from condensate; the needle residues, or “muka”, escapes from the top end of the thermal chamber. This essential oil reclaim apparatus also relates to the invention.

Abstract: A tree harvesting apparatus and method is particularly adapted for use in crowded housing and industrial areas where there is concern for relatively heavy cut tree portions causing damage when allowed to free fall to the ground. The tree harvesting apparatus and method enables a cut portion of a tree such as a tree top to be weighed after being cut but before it is lowered or allowed to free fall to the ground dependent on its weight. A camera mounted on the harvesting apparatus enables the cutting and weighing operation to be observed by an operator on the ground. The tree harvesting apparatus mounts on the outer end of a boom which in turn mounts on a turntable which can rotate 360°, thus making the apparatus and method useful for harvesting a plurality of trees from one location of the apparatus.

Abstract: In a method, when using a single-grip harvester head for felling and processing trees, of controlling the press power which, by means of a limbing knife assembly (6), is exerted on a stem (3) which is horizontally fed through th head with its butt end first, the diameter of the stem is measured and the press power is reduced in accordance with a control diagram as the diameter decreases during the feeding. The measured diameter values are registered, and each measured diameter value is compared with a predetermined diameter value which is selected from the diameter values of the stem (3) which are previously registered during the feeding of the stem. If a measured diameter value is found to equal or be greater than this predetermined diameter value, the press power is increased to a corrective power value, which is maintained until a later measured diameter value falls below a reference value.

Abstract: In a device and a method for a tree harvester head for trimming tree trunks, the device includes a frame (1) supporting feed rollers (2), one or more trimming knives (4) that pivot towards and away from the tree trunk, as well as a trimming knife (6) permanently fixed to the frame (1) and with a radius of curvature that is essentially equivalent to the radii of curvature of the pivoting trimming knives (4).

Abstract: In a method, when using a single-grip harvester head for felling and processing trees, of controlling the press power which, by means of a limbing knife assembly (6), is exerted on a stem (3) which is horizontally fed through th head with its butt end first, the diameter of the stem is measured and the press power is reduced in accordance with a control diagram as the diameter decreases during the feeding. The measured diameter values are registered, and each measured diameter value is compared with a predetermined diameter value which is selected from the diameter values of the stem (3) which are previously registered during the feeding of the stem. If a measured diameter value is found to equal or be greater than this predetermined diameter value, the press power is increased to a corrective power value, which is maintained until a later measured diameter value falls below a reference value.

Abstract: A delimber (10) for removing secondary limbs from a primary limb of a tree Comprises an arm (12) arranged to extend around the primary limb. The arm is provided with cutter segments (18) oriented to cut the secondary limbs from the primary limb of the tree. The delimber also comprises a means (50, 52, 54) for moving the arm at least partly along the length of the primary limb. In use, the arm is extended around the primary limb of the tree and is then moved along the length of the primary limb, thereby cutting secondary limbs from the primary limb.

Abstract: The subject of the invention is a grapple harvester which is equipped with a felling and cutting device (14), a feeder (12) and delimbing devices (9, 10, 11, 13). The grapple harvester according to the invention is equipped with a bulk handling device (4) which is arranged to grip together several trees, which are usually gathered one by one and, preferably, whilst in the vertical position, for cutting by the grapple harvester.

Abstract: The preferred embodiment of the present invention is a tree trimming apparatus comprising a resilient frame, upright assemblies, drive assemblies, resilient alignment bar assemblies, spring tensioner assemblies, a buss assembly, and saw assemblies.

Abstract: A tree delimber includes a hollow tube having opposite upper and lower ends, the upper end adapted for mounted below an aerial hoist, the lower end having an anti-rotation device mounted thereto for coupling with, mating into and temporarily entangling with the branches of a tree as the trunk of the tree is journalled upwardly through the hollow tube as the tube is lowered onto the tree and down the trunk of the tree. The anti-rotation device inhibits rotation of the tube about a longitudinal axis of symmetry of the tube. A collar is rotatably mounted to the lower end of the tube. An annular saw blade having a lower cutting edge is mounted to the collar so as to dispose the cutting edge downwardly. The cutting edge of the saw rotates in a circle contained in a plane generally perpendicular to the axis of symmetry of the tube. A prime mover is mounted to the tube.

Abstract: A felled tree delimbing system which is skid mounted, having; a steel, horizontal chute with vertical cutting bars at one end where an overhead locking and cutting arm cooperates with the cutting bars. The operator engages the device by placing a bundle of cut trees horizontally on the chute, the tree's weight forcing down a trigger, causing the counter-weighted cutting arm to close over the trees forcing them into rectangular openings formed thereby. The bundle of trees is in the grasp of a logger's knuckle boom crane or similar piece of equipment at the lower portion of the tree trunks. The trees are then pulled along the chute through the edged rectangles, thus shearing off and removing limbs and branches from the upper part of the tree trunks. Upon removal of delimbed trunks from the chute, the unweighted trigger is released, allowing the cutting arm to return to an open position through action of pulleys and a counter weight.

Abstract: The innovation concerns a wood harvesting method and a harvester head. The method is used to harvest all sizes of trees without to take the harvester to the site more than once. The method consists of placing the harvester head against the first tree, closing all grapples around the tree, cutting the tree with the cutting device, lifting the cut tree a little by holding it with the grapples fastened to the telescopic boom and using the stroke cylinder to move the telescopic boom in relation to the main body, moving to the next tree, opening the rigid grapples and holding the first tree in an upright position with the articulated grapples, closing the rigid grapples around the tree, opening the articulated grapples, so that their turning tips slide away from between the trees, closing the articulated grapples around all the trees, cutting the tree with the cutting device, and continuing the work in the above described order by collecting more trees and cutting them, until the grapples are full.

Abstract: The invention relates to a delimbing apparatus for processing elongated pieces, particular tree trunks (S), which apparatus (1) comprises a frame structure (2) to be suspended at the end of a boom assembly in a working machine, at least one means, articulated in relation to said frame structure, for processing the trunk (S), and actuators (31a, 31c, 51a, 51b) for controlling the position and force effect (F) of said means. In the invention, said actuators comprise at least one joint (100) driven by a pressurized medium and comprising a joint frame (101), a joint arm (103) swivelled in said joint frame, and a blade structure (105, 106) fitted in said joint, by means of which blade structure the pressure effect of the pressurized medium produces said swivelling.

Abstract: A clamp control system for a feller/buncher has three buttons for automating the operation of the harvesting and accumulating clamps. A CLOSE button, when momentarily actuated for the first tree of a bundle, closes the harvesting clamp and the accumulating clamp and then re-opens the harvesting clamp. When actuated again momentarily for the second and subsequent trees, the harvesting clamp closes, the accumulating clamp opens and re-closes and the harvesting clamp re-opens. Actuation of an OPEN button opens both clamps and resets the system to be ready for the first tree of the next bundle. Actuation of a STOP/CANCEL button freezes both clamps in their current positions.

Abstract: The present invention provides an apparatus and method of processing logs. The apparatus includes a linkage having a boom and a stick. The boom is adapted for attachment to a support platform. A delimbing assembly is connected to the boom, and a loading assembly is connected to the stick. The method includes the steps of picking up a log, delimbing the log, and placing the log into a desired position.

Abstract: A tree delimbing system which utilizes a “drive-through” gate assembly having a plurality of pre-dimensioned apertures formed therein for removing tree limbs from tree trunks of various dimensions. Each aperture is dimensioned to selectively receive a plurality of tree trunks of varying diameters for subsequent limb removal. A single gate structure pivots from an upright (vertical) position to a lowered (horizontal) position upon impact with a skidder with attached felled trees. The impact of the skidder forces the gate down for tree transport therethrough. Once the trees have cleared the gate, a counter weight attached to the gate by cable returns the gate to its upright position. The trees are then rearwardly pushed through the apertures in the gate by the skidder to remove the limbs. The gate assembly forms an independent and stationary structure with anchors for securing the structure within surrounding terrain.

Abstract: A boom assembly for a delimber having an operator boom with first and second ends and a connector boom having first and second ends. Pivot means pivotably connect the second end of the operator boom to the first end of the connector boom, the connector boom aligned with the operator boom. A delimber boom, having a delimbing head at one end, is mounted near the one end to the connector boom at its second end. The delimber boom extends rearwardly from the connector boom and at a slight angle, when the boom assembly is viewed from above, to the connector boom. The delimbing head is mounted on the bottom of the delimber boom and the boom assembly includes at least two butt plates, each movably mounted on the bottom of the delimber boom. The butt plates are spaced apart longitudinally and spaced from the delimbing head toward the other end of the delimber boom.

Abstract: An apparatus which delimbs and debarks one or multiple tree stems which are fed into the apparatus by a circle loader by its boom arm and claw. The tree stem(s) are pulled through the apparatus by the circle loader as the apparatus delimbs and debarks the tree stems with a flail means of various designs and configurations. The flail means if further designed to eject material striped from the tree stems in a controlled fashion from the apparatus. Other safety features contain and prevent uncontrolled ejection of material striped from the tree stems. The flail means is further designed to assist the tree stem feeding by frictionally moving the tree stems into the apparatus with the action of one of the flail drums; and thus reducing wear and tear on the circle loader. The expanse of the feeding opening is designed to accommodate larger diameter and more numerous tree stems resulting in more efficient, faster, and safer delimbing and debarking.

Abstract: A push-through delimber device having a frame, a blade lattice, a trough, a throat and a saw so that trees can be topped and delimbed in the throat and pushed through the delimbing blade lattice to further delimb the trees. The delimber device can also include pivoting arcuate blades for delimbing trees.

Abstract: A push-through delimber device having a frame, a blade lattice, a trough, a throat and a saw so that trees can be topped and delimbed in the throat and pushed through the delimbing blade lattice to further delimb the trees.

Abstract: A self-propelled, climbing tree trimmer for severing branches from a tree (68) consisting of a support ring (12) divided into two equal parts, with a hinge (18) connecting the ring parts together, thus permitting it to be axially rotated apart to surround a tree. A channel ring (30) in two equal halves are joined onto the support ring, and a similar two piece rotatable ring gear (40) is juxtaposed on top of the channel ring in a revolvable manner. A number of pivoting knife blades (46) are attached to the ring gear so as to tilt inward when rotated, and a ring gear drive motor (62) interfaces with the ring gear rotating the ring gear at a speed which tilts the blades sufficiently to engage and cut fronds or branches from the tree upon which the trimmer surrounds.

Abstract: A tree delimber including a track, a gripping assembly for gripping the butt end of a tree, and a delimbing assembly movably coupled to the track and includes a delimbing blade and a guide for funneling the tree into the delimbing blade.

Abstract: A delimber having a standard carriage and a delimbing boom, the delimbing boom slidably mounted through the carriage. A drive module is detachably connected to the carriage for use in moving the boom relative to the carriage. Two different types of booms and up to three different drive modules, each with a different drive, can be provided. The boom and module selected to give the operating characteristics desired by the operator are connected to the carriage. Drive transfer members, in the form of cable or chain drives, are connected between the selected drive module and the selected boom. The module carries a variable displacement hydraulic motor. The motor is connected by a gear box to the drive transfer member. On delimbers using cable drives, at least one end of each cable is connected to the delimber with a hydraulic tensioner.

Abstract: A method for cutting trees (18) in the vicinity of a power line (10) using a topping saw (17) suspended from a helicopter (15) in such a way that the helicopter is flown in the direction of the power line (10) so close to the electricity wires (12) that the topping saw suspended from the helicopter cuts the desired tops of the trees. The cutting line (14) of the topping saw (17) is determined in such a way that the helicopter is flown with the help of a video camera (21) attached to the suspension bar (16) for the topping saw at an angle of 45° and a monitor (22) placed in connection with the helicopter's cockpit so that the video camera is kept directed towards the electricity wire (12) of the power line (10). The distance (a, b) of the point where trees are to be cut from the electricity wire (12) is determined by adjusting the distance (h) of the video camera from the cutting blade (20) of the topping saw (17).

Abstract: In the operation of wood cutting machines such as delimbing machines which use chain saw cutting devices, it is common to either position the lubricating oil reservoir above the chain saw cutting device to create a gravity-fed system or couple a pump apparatus to the chain saw cutting device. Both arrangements may limit the flexibility of placement of the components comprising the lubrication system. The present invention provides a lubrication system for a wood cutting machine in which a receptacle receives lubricating fluid from the reservoir by use of a source of supply pressure within the receptacle. A source of discharge pressure operates on the receptacle to transport the lubrication fluid to the cutting chain device.

Abstract: The invention relates to a method in a delimbing device (1), which delimbing device (1) comprises a frame structure (2), at least one supporting means (3a, 3b, 3c) attached in the frame structure (2) in a movable (5a, 5b, 5c) manner to support the tree-truck (S) and to exert a first force effect (F0) on the tree-trunk (S), actuator means (9) to control the position of the supporting means (3a, 3b, 3c) to maintain the first force effect (F0) exerted by the supporting means (3a, 3b, 3c) on the tree-trunk (S). In the method the second force effect (F) exerted by the tree-trunk (S) to the frame structure (2) is measured with sensor means (12) arranged in connection with the frame structure (2) and to change the second force effect (F), the first force effect (F0) is adjusted by utilizing the information obtained from the measurement.

Abstract: A circular saw head for use as a boom mounted head attachment is disclosed for agricultural trimming. The blades can cut as much as four inches of material. An adjustable head piece is provided that is also reversible allowing for exposure of more or less of the blades. Safety aprons are provided to deflect cut material away from the operator.

Abstract: The present invention relates to a timber harvester (10), which includes two opposing jointed feed devices (14), stripping blades (15), and a cutting device (16). The frame (21) of the feed device (14) is set on articulated arms (13), and in which the feed device (14) in a roller chain (17) of one or more rows of links, set to rotate round a drive cog (24), a turning member (25), and slightly curved slide guides (22, 23).

Abstract: An improved self-aligning tree delimbing apparatus for use in conjunction with a knuckle boom loader having an inner frame member pivotally mounted and concentrically received within an outer frame member, which is rigidly attached to a base member. Pivotally mounted within the inner frame member is a tree delimbing cutter head assembly having opposing pairs of tree guide arms and tree delimbing arms pivotally mounted thereon, thereby allowing for simultaneous multi-dimensional pivotal motion of the cutter head assembly within the frame members. Such motion allows the cutter head assembly to easily align with the longitudinal axis of the trees being delimbed, thereby increasing the efficiency of the apparatus while reducing the binding stresses and necessary force applied by the knuckle boom loader.

Abstract: A delimbing device includes a cutting head assembly having (i) a cutting blade configured to cut branches off of a tree and (ii) a bar saw configured to cut through the tree. The device also includes a first support member supporting the cutting head assembly. The device further includes a second support member supporting the cutting head assembly. The device also includes a bearing assembly secured to the first support member and the second support member so that (i) the bearing assembly is interposed between the first support member and the second support member and (ii) the cutting head assembly can rotate relative to the second support member around an axis of rotation such that when a rotational force is applied to the cutting head assembly the cutting head assembly rotates from a first orientation to a second orientation.

Abstract: A mechanical pull-through delimber device having opposed semicircular blades urged closed by counter-weights and coupled so that both open when one is pivoted open using a lever.

Abstract: A delimber having a standard carriage and a delimbing boom, the delimbing boom slidably mounted through the carriage. A drive module is detachably connected to the carriage for use in moving the boom relative to the carriage. Two different types of booms and up to three different drive modules, each with a different drive, can be provided. The boom and module selected to give the operating characteristics desired by the operator are connected to the carriage. Drive transfer members, in the form of cable or chain drives, are connected between the selected drive module and the selected boom. The module carries a variable displacement hydraulic motor. The motor is connected by a gear box to the drive transfer member. The variable displacement motor can be used on a delimber that does not employ a detachable drive module. On delimbers using cable drives, at least one end of each cable is connected to the delimber with a hydraulic tensioner.