US 3,945,610 A · Timber felling device

Abstract

A portable timber felling device for controlled felling of a tree including a hydraulic ram unit positionable in a backcut of the tree for extension therein to fell the tree. A hydraulic power unit includes a pump and control valves to generate and regulate the hydraulic power required to operate the hydraulic ram unit. A hose means of a considerable length interlinks the power and ram units for the transmission of the generated hydraulic power. A remote control unit with a manually operable control member controls at least one of the valves on the power unit via a communication means which places the operator of the remote control at a substantial distance from the power unit and the tree to be felled. The entire structure is portable and a battery provides the electrical power for remote control.

Claims12

Dependent claims

A portable timber felling device for causing controlled felling of a tree comprising, a hydraulic ram unit positionable in a pre-cut recess of a tree for extension to cause the felling of the tree, a transportable hydraulic power unit separate from the ram unit for generating hydraulic power for said ram unit and including a pump and control valves, hose means extended between the power unit and the ram unit, a pressure transducer on said power unit and in circuit with the ram unit for detecting the pressure in the ram unit, a remote control unit with a manually operable control member for at least one of said control valves and a pressure gauge, and means placing said remote control unit in communication with said one control valve and said pressure gauge in communication with said pressure transducer while at a substantial distance from said power unit.

A device for felling trees including a power unit having an engine, a pump driven by the engine, a reservoir, and a plurality of control valves, a ram unit separate from the power unit positionable in a tree recess and extensible under pressure to fell a tree;

hose means connecting said power unit to said ram unit;
said control valves including a first valve in circuit with said hose means to either connect the hose means to said reservoir for retraction of the ram unit or to block said last-mentioned connection, a second pilot operated valve for causing the pump output to flow either to said hose means or to reservoir, and a third pilot valve for controlling the operation of said second valve;
and a remote control unit at a distance from said power unit for operating said third pilot valve.

Dependencies are inferred from the claim text.

Timber felling device

Life of this patent

Timber felling device

Life of this patent

Abstract

Claims12