An arrangement in a boom system, specifically in a forest machine, includes at least two interlinked boom parts and at least one power transmission connected to the boom parts for moving the boom parts in relation to each other and the environment. The boom part includes an elongated body with a hollow structure and at least one set of joints intersected by turning axles for attaching the boom part to an adjacent structure, and at least one set of attachments for attaching an actuator controlling the boom system to the body, whereby at least one boom part is formed as a uniform, hollow piece made of fluid material. The cross-section of the body is made to cinch toward the midpoint of the body.

An arrangement in a boom system, specifically in a forest machine, includes at least two interlinked boom parts and at least one power transmission connected to the boom parts for moving the boom parts in relation to each other and the environment. The boom part includes an elongated body with a hollow structure and at least one set of joints intersected by turning axles for attaching the boom part to an adjacent structure, and at least one set of attachments for attaching an actuator controlling the boom system to the body, whereby at least one boom part is formed as a uniform, hollow piece made of fluid material. The cross-section of the body is made to cinch toward the midpoint of the body.

A cutter holder has two limbs extending at an angle to each other. A cutter is mounted on one side of the cutter holder. An opposite side of the cutter holder has a prism-shaped cavity defined thereon. The cavity has a V-shape cross-section having a recessed groove at a base of the V-shape. A center line of the recessed groove is laterally offset from a center line of the cutter holder.

A cutter holder has two limbs extending at an angle to each other. A cutter is mounted on one side of the cutter holder. An opposite side of the cutter holder has a prism-shaped cavity defined thereon. The cavity has a V-shape cross-section having a recessed groove at a base of the V-shape. A center line of the recessed groove is laterally offset from a center line of the cutter holder.

An arrangement and method are provided for enabling rotation movement between a tandem or caterpillar axle and a body of a vehicle. This type of vehicle includes at least one body part that is provided with a tandem or caterpillar axle. At least one body part includes a main body and an auxiliary body connected to it to rotate around the longitudinal axis of the vehicle or an essentially parallel axis thereto. The tandem or caterpillar axle is connected substantially rigidly to the main body, and the body part has at least one actuator for controlling the rotation movement between the main body and auxiliary body. In this way, changes in the position and motion status of the auxiliary body, especially in relation to the rotation around the longitudinal axis of the vehicle, are arranged to cause in the actuator a pushing or pulling motion that steers the auxiliary body to a rotation movement for the purpose of arranging the auxiliary body to a substantially horizontal position.

A collection method using a collection system including a lifting device that is configured to wind up an overhead line supported by a support post, a suspension device that is connected to the overhead line and is movable in the air as the lifting device winds the overhead line, and a grip device suspended from the suspension device includes a step of gripping a tree by the grip device at two points, a step of cutting the gripped tree, a step of tilting the cut tree such that a longitudinal direction of the tree is along a horizontal direction, and a step of conveying the tree gripped by the grip device as the lifting device winds the overhead line.

A method and container for developing seedlings includes germinating the seeds and air pruning the seedlings to a depth of about 3 inches.

A method and container for developing seedlings includes germinating the seeds and air pruning the seedlings to a depth of about 3 inches.

A cross-link assembly for a dangling worktool may include a frame configured to connect to a grapple, the frame having spaced apart arms; a pin movably engaged with the spaced apart arms, the pin having an abutment portion; and a lock member movably engaged with the frame. The lock member may be configured to engage with the abutment portion and have a lock portion configured to engage with a lock element provided on the grapple.

The invention relates to a method in a forest machine. In the method the surroundings of the forest machine are observed using one or more sensors. The observations are assembled to form a database of the surroundings, and the database is utilized in the operation of the forest machine. In the method observations of a limited area are used. In addition, a database is formed in real time in the forest machine. Further, a view is formed from the database of selected observations, from which a track in the surroundings is recognized. The forest machine is then oriented in the direction of the track, once the forest machine's direction of travel relative to the recognized track has been recognized. The invention also relates to a system in a forest machine.