Traversing hoists – With motor control – Manual fluid valve actuator
Patent
1996-05-08
1998-06-23
Brahan, Thomas J.
Traversing hoists
With motor control
Manual fluid valve actuator
212290, 212292, 212296, 212300, 212231, 212347, 212270, B66C 2342
Patent
active
057692513
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a system and a method for controlling the operation of a reach tower crane, in particular, a system and a method for controlling the operation of a reach tower crane in which a horizontal boom can safely and easily be operated or stored by one operator in a cab.
BACKGROUND ART
A conventional reach tower crane is generally equipped with an arm as shown in, for example, Japanese Utility Model Application Laid-open (U) 63-41092. The arm comprises a vertical boom and a vertically swingable horizontal boom connected therewith. When the crane travels, the vertical boom is positioned horizontally, and the horizontal boom is positioned against the upper part of the vertical boom. On the other hand, during operation of the crane, the vertical boom is erected, and the horizontal boom is swingable upwardly and downwardly.
However, when the arm is folded, the vertical boom and the horizontal boom are overlaid on each other, thereby increasing the vertical dimension of the folded arm. As a result, while the crane is traveling, the folded arm presents an obstacle to the field of vision for an operator.
As a means to solve such problem, there has been proposed an apparatus to operate or store the horizontal boom of a reach tower crane as shown in, for example, Japanese Utility Model Application No. 4-091512 (published as Japanese Utility Model Application Laid-Open (U) 6-49481).
The reach tower crane is provided with a multiple stage telescopic vertical boom so that it can be extended upwardly or retracted downwardly in erecting or storing, and the vertical boom is provided with a multiple stage telescopic horizontal boom which is swingable upwardly and downwardly.
The apparatus provides for a field of vision for an operator during traveling of the crane, by pirouetting the horizontal boom from under the vertical boom in the widthwise direction of the vertical boom until it is parallel with a side of the vertical boom, and storing the booms with a reduced vertical dimension.
However, when pirouetting the horizontal boom, such prior art requires manual operation by another operator outside the cab, and is capable of working only in the condition that the vertical boom is retracted to its shortest length. Accordingly, in a limited space, working by using the prior art faces great difficulties, and is attended with danger.
Further, an operation of setting or removing a securing pin for both the vertical boom and the horizontal boom, and the operations of pirouetting, swinging upwardly and downwardly, and telescopically moving the horizontal boom, respectively, are independent operations. As a result, there are a lot of possibilities that a misoperation can cause danger, and that one apparatus can interfere with another one to cause breakage.
SUMMARY OF THE INVENTION
The present invention is made in order to eliminate the defects of the prior art. It is an object of the present invention to provide a system and a method for controlling the operation of a reach tower crane which enable a horizontal boom to safely and securely be operated or stored by one operator in a cab, and to also easily work in a limited space.
The first aspect of the present invention provides a system for controlling the operation of a reach tower crane, comprising: operating an apparatus to operate or store the horizontal boom; the control signal in accordance with a signal from a sensor; actuators in accordance with predetermined control signals transmitted from the controller; and connection with operating or storing the horizontal boom, the operation levers and the operation switches being provided in the cab of the reach tower crane, wherein the locking apparatuses comprises: parallel with a side of the vertical boom; and securing, during crane operation, a joint bracket provided with the horizontal boom, the operation levers comprise: vertical boom, the telescopic motion of the horizontal boom, the operation of the rotary motor, and the operation of the second locking apparatus, and boom and the ho
REFERENCES:
patent: 3831771 (1974-08-01), Wiencek
patent: 3944081 (1976-03-01), Wellman
patent: 5115925 (1992-05-01), Koizumi
patent: 5193698 (1993-03-01), Koizumi
Ohta Shinichi
Sawabe Hiroyuki
Ushioda Takeshi
Wada Minoru
Brahan Thomas J.
Komatsu Ltd.
Komatsu Mec Kabushiki Kaisha
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