Material or article handling – Self-loading or unloading vehicles – Loading or unloading by other carrier or mover means – and...
Patent
1988-04-07
1989-11-21
Bucci, David A.
Material or article handling
Self-loading or unloading vehicles
Loading or unloading by other carrier or mover means, and...
144 3D, 144 34R, 144336, 414555, 414728, 414729, A01G 2308, B60P 154
Patent
active
048818658
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD OF THE INVENTION
This invention relates to a forest machine having a crane and being of the type comprising a driver's cab which is mounted on a wheeled chassis and behind which a load carrier is disposed, and a crane post mounted in association with said cab and rotatable relative to the chassis and carrying an outer boom having a telescopic or extension boom movable backwards and forwards and adapted at its free end or tip to carry a working tool, such as a grapple, a harvester assembly, a loading hook or the like.
BACKGROUND OF THE INVENTION
Hitherto known cranes in forest machines of the above-described type normally comprise not only a crane post and an outer boom, but also a first boom section which is mounted therebetween and the movements of which are adjusted by means of at least one hydraulic cylinder. This means that it is difficult to maneuver such cranes when operating in forest stands where it is desirable in as short a time as possible to seize and/or process the trees and place them on the load carrier of the machine, since the operator must pay attention not only to such functions as the rotation of the crane post, pivotal movement of the outer boom and telescopic movement of the extension boom in relation to the outer boom, but also to the movements of the first boom section in relation to the crane post as well as the cooperation of the first boom section with the outer boom. Another shortcoming inherent in prior art cranes of the above type is that they are of a complicated and, thus, expensive design.
BRIEF ACCOUNT OF THE INVENTIVE CONCEPT
The present invention aims at overcoming the above-mentioned drawbacks by providing a crane which is designed especially for forest machines, such as forwarders or harvesters, and which is easy to operate in a quick and convenient way and is of a simple and inexpensive design while being robust and capable of handling heavy loads within a substantial, optimal area of operation. According to the invention, these and other objects are achieved by a forest machine which is characterized in that the crane post comprises two suitably inclined, spaced-apart support arms between which a shaft extends which serves as a pivot and on which the outer boom is mounted in a position between, preferably midway between said arms, that said shaft is located at a distance from the centre of rotation of said post exceeding half the distance between a pair of front wheels carrying the chassis of the machine, and that the outer boom is movable through at least 90.degree. between a substantially horizontal position and a substantially vertical position, more precisely by means of at least one power mechanism, particularly a hydraulic cylinder, whereby the boom tip is movable not only within an area substantially completely covering the volume of the load carrier, but also to positions close to both sides and the front of the cab as well as the ground surrounding the machine.
U.S. patent specification No. 3,265,219 describes a crane which is intended for a truck and which, in addition to a rotatable frame in the form of a post and a first boom section which is pivotal in relation to the post, comprises an outer boom which is pivotal to a limited extent relative to the first boom section and which is articulated in a point located outside or at the side of the wheels of the vehicle. In this construction, the outer boom is however laterally offset with respect to the first boom section so as to be capable, when moved to a parking position, of moving beside both the first boom section and the post. In practice, this laterally offset location of the outer boom relative to the first boom section means that the crane is ill-suited for handling such heavy loads as trees, since in such a case extremely large torques are applied to the crane in the area between the outer boom and the first boom section. Further, the known crane has a limited range of operation. For instance, the working tool employed cannot be placed in front of the driver's cab.
BRIEF DESC
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Bucci David A.
OSA AB
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