Excavating – Combined or convertible
Patent
1993-12-23
1996-04-16
Reese, Randolph A.
Excavating
Combined or convertible
37443, 212300, 175162, 172126, E02F 396
Patent
active
055071074
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a hoisting boom assembly, whose frame and actuators are to be coupled to a mobile working machine and which comprised an upright column or the like supported by the frame and at least partially rotatable around a vertical axis by means of a rotary actuator, a second boom having its first section pivotably journalled in a vertical plane, a horizontal shift mechanism and a horizontal shift actuator for shifting the free end of the second boom in a horizontal direction, the horizontal shift mechanism being adapted to act between a first boom and the sections of the second boom so that the horizontal shift mechanism can be operated between the sections of the second boom independently of the position of the first boom; the first boom being fitted between the upright column or the like and the second boom and having its first end pivotally mounted on the upright column or the like, preferably on the top section thereof, and having its second end pivotally mounted on the second boom; and an actuator fitted between the upright column or the like and the first boom for pivoting the first boom in vertical plane relative to the upright column or a like.
When manipulating the hoisting boom assembly, the operating range of the second boom is defined so that in a first extreme position of the second boom the longitudinal direction of its second section is substantially parallel to the longitudinal direction of its first section, the second section serving as an extension or a jib for the first section and, in a second extreme position of the second boom, the longitudinal direction of its second section is substantially opposite to the longitudinal direction of the first section, the second section being thus preferably tangential to the first section. A particular object of the present invention is a hoisting boom assembly suitable for for example, use in drilling operations in addition to being used with a loading harvester.
In the past, a loading harvester has been generally fitted with a hoisting boom assembly provided with two booms, a lifting boom and a carrier boom. When this type of hoisting boom assembly is operated to carry a load in the direction of a crane, it is necessary to operate both the lifting and the carrier boom. This results in a complicated operation of the hoisting boom assembly. In order to achieve a major operating range or reach, the carrier boom generally comprises a telescopic boom. However, this results in a heavy overall hoisting boom assembly, and particularly the passage of a pressure medium or hydraulic fluid to the end of a boom assembly is technically difficult to carry out.
In order to eliminate the above drawbacks, for example, the SE Publication 383 991 discloses hoisting boom assemblies operating in such a manner that a single actuator, especially a hydraulically operated cylinder-piston aggregate, is used to produce a linear movement a horizontal direction. In the prior known hoisting boom assemblies, this boom arrangement is journalled directly to an upright column which is in turn coupled with the body of a mobile working machine, such as a tractor. A drawback of this structure is, however, that the boom assembly is very long and has a high center of gravity. A high center of gravity results from the fact that the upright column must be sufficiently long in order that the hoisting boom assembly can be pivoted to lie above the operator's cabin in a transporting position.
The Applicant's Finnish Patent No. 82826, entitled "Hoisting boom assembly", discloses a solution which is further developed relative to the prior art hoisting boom constructions, such as those mentioned above. Unlike the other prior art, this patent discloses a hoisting boom assembly, comprising a first boom fitted between an upright column and a second boom and having its first end pivotally mounted on the upright column and its second end pivotally mounted on the second boom, an actuator fitted between the upright column and the first boom for pivo
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Batson Victor
Reese Randolph A.
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