Telescoping carrier for forestry equipment

A carrier adapted to be supported on a vehicle, one end of the carrier being provided with means for detachably attaching an implement for forestry cultivation, and the carrier being capable of being connected to the vehicle at at least one connection means between the ends of the carrier, characterized in that the connection means comprises a vertical axle permitting the carrier to be rotated about a vertical axis and in that the carrier consists of at least two telescopically movable members, one of which is capable of being connected to the vehicle by said connection means and another of which is provided with said means for detachably attaching said implement for forestry cultivation, the members being interconnected by a device consisting of a hydraulic circuit including a hydraulic double-acting piston-cylinder means connected to the telescoping members, and an accumulator, the device exerting a force, the force being applied by fluid pressure, the force being operable to urge the telescopically movable members to telescopically contract the contracting force being adapted to urge the implement against a towing resistance toward said vehicle and said device being provided with a hydraulic pressure relief valve between supply and discharge conduits to the piston-cylinder means and set to a predetermined value so that when the towing resistance exceeds the predetermined value, the force urging the members to contract is overcome by said resistance, thus permitting relative movement between the telescopically movable members and permitting said force to retract the members when the towing resistance no longer exceeds the predetermined value, and the device further comprising a direction control valve for said piston-cylinder means, the relief valve being set at a pressure which is higher than the pressure for the direction control valve.

A vehicle and carrier combination comprising an articulated forestry vehicle and a carrier supported on said vehicle, one end of carrier being provided with means for detachably attaching an implement for forestry cultivation, and the carrier being connected to the vehicle at at least one connection means between the ends of the carrier, characterized in that the connection means comprises a vertical axle permitting the carrier to be rotated about a vertical axis and in that the carrier consists of at least two telescopically movable members, one of which is connected to the vehicle by said connection means and another of which is provided with the said means for detachably attaching said implement for forestry cultivation, the members being interconnected by a device consisting of a hydraulic circuit including a hydraulic double-acting piston-cylinder means connected to the telescoping members, and an accumulator, the device exerting a force, the force being applied by fluid pressure, the force being operable to urge the telescopically movable members to telescopically contract the contracting force being adapted to urge the implement against a towing resistance toward said vehicle and said device being provided with a hydraulic pressure relief valve between supply and discharge conduits to the piston-cylinder means and set to a predetermined value so that when the towing resistance exceeds the predetermined value, the force urging the members to contract is overcome by said resistance, thus permitting relative movement between the telescopically movable members and permitting said force to retract the members when the towing resistance no longer exceeds the predetermined value, and the device further comprising a direction control valve for said piston-cylinder means, the relief valve being set at a pressure which is higher than the pressure for the direction control valve.

A carrier adapted to be supported on a vehicle, one end of the carrier being provided with means for detachably attaching an implement for forestry cultivation, and the carrier being capable of being connected to the vehicle at at least one connection means between the ends of the carrier, characterized in that the connection means comprises a vertical axis permitting the carrier to be rotated about a vertical axis and in that the carrier consists of at least two telescopically movable members, one of which is capable of being connected to the vehicle by said connection means and the other of which is provided with said means for detachably attaching said implement for forestry cultivation, the members being interconnected by a device exerting a force, the force being applied by fluid pressure, the force being operable to urge the telescopically movable members to telescopically contract the contracting force being adapted to urge the implement against a towing resistance toward said vehicle and said device being provided with a pressure relief valve set to a predetermined value so that when the towing resistance exceeds the predetermined value, the force urging the members to contract is overcome by said resistance, thus permitting relative movement between the telescopically movable members and permitting said force to retract the members when the towing resistance no longer exceeds the predetermined value,

• wherein the member to which the implement may be attached is adapted to be movable relative to the vehicle in the longitudinal direction and is supported within the member adapted to be connected to the vehicle by means of support rollers, one of the support rollers being located at a rearward end of the member adapted to be connected to the vehicle.

A vehicle and carrier combination comprising an articulated forestry vehicle and a carrier supported on said vehicle, one end of the carrier being provided with means for detachably attaching an implement for forestry cultivation, and the carrier being connected to the vehicle at at least one connection means between the ends of the carrier, characterized in that the connection means comprises a vertical axle permitting the carrier to be rotated about a vertical axis and in that the carrier consists of at least two telescopically movable members, one of which is connected to the vehicle by said connection means and another of which is provided with the said means for detachably attaching said implement for forestry cultivation, the members being interconnected by a device exerting a force, the force being applied by fluid pressure, the force being operable to urge the telescopically movable members to telescopically contract the contracting force being adapted to urge the implement against a towing resistance toward said vehicle and said device being provided with a pressure relief valve set to a predetermined value so that when the towing resistance exceeds the predetermined value, the force urging the members to contract is overcome by said resistance, thus permitting relative movement between the telescopically movable members and permitting said force to retract the members when the towing resistance no longer exceeds the predetermined value,

• wherein the member to which the implement may be attached is movable relative to the vehicle in the longitudinal direction and is supported within the member connected to the vehicle by means of support rollers, one of the support rollers being located at a rearward end of the member connected to the vehicle.