Traversing hoists – Having random condition sensor combined with an indicator or...
Patent
1997-09-02
1998-10-20
Oen, William L.
Traversing hoists
Having random condition sensor combined with an indicator or...
364424045, B66C 2304, G06G 700
Patent
active
058233709
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a movable range indicating apparatus for a mobile crane vehicle, and more particularly, to a movable range indicating apparatus for a telescopic boom end of a mobile crane vehicle.
BACKGROUND ART
Hitherto, mobile cranes have included a revolving superstructure, which has been provided on a self-movable base carrier; and a telescopic boom, which extends and contracts in a plurality of stages, has been mounted to the revolving superstructure. In addition, a hook is suspended from the distal end of the telescopic boom via a cable, and a crane operation is performed using the hook. When performing the crane operation, an operator is required to discern the condition of the telescopic boom at all times.
To this end, conventional movable range indicating apparatuses for mobile crane vehicles, etc., as shown in FIG. 19, adopt polar coordinates, in which a radial direction is taken as an operating radius or a load factor and a circumferential direction is taken as a turning angle (refer to, for example, Japanese Examined Patent Publication No. 3-17759, Japanese Unexamined Patent Publication No. 3-67895, and Japanese Unexamined Utility Model Publication No. 3-130291). According to these apparatuses, a rated operating radius, corresponding to a current actual lifting load, is calculated for each turning angle so as to be taken as the actual operating radius. In the above polar coordinates, a telescopic boom end position 61, obtained from the actual operating radius and the actual turning position, and a rated operating radius 62 (limit movable range) for each turning angle are indicated by superimposed images.
In general, however, since a sensation of the operator is formed on the basis of the rectangular coordinates, the sensation with respect to a rotary motion (angle) is often worse than the sensation with respect to a linear motion (distance). In other words, since the direction of the operating radius (back and forth) is taken as the linear motion, and the turning (left and right) direction is taken as the rotary motion in the polar coordinates, it is not easy to perceive the dangers in the turning direction as compared to the direction of the operating radius. In addition, it is quite remarkable that many accidents in the crane operation happen during turning. That is, according to the conventional art, one problem exists in that the angle is discerned as a measure when perceiving the dangers in the turning direction.
Further, most of the conventional apparatuses have an operation range limit function of moving the telescopic boom of the mobile crane vehicle to a desired position in order to set the movable range, and of sounding an alarm and of limiting the action of the telescopic boom when the end of the telescopic boom reaches the boundary of the movable range during the crane operation. For this reason, information about the movable range of the telescopic boom cannot be obtained from the indicating apparatus, and the operator cannot completely discern the operating radius and the turning range, so that there is a malfunction such that ensuring safety of the operation is hindered.
Next, another prior art apparatus has been known which subjects a crane to a simulation operation, allows a movable range of a revolving superstructure including an operating machine to be stored, and suspends the operation of the crane and gives a warning based on the stored information (refer to, for example, Japanese Unexamined Patent Publication No. 56-75393). Further, according to an indicating apparatus put into practical use (refer to, for example, Japanese Unexamined Patent Publication No. 5-58589), as shown in FIG. 20, a limit movable range 63 and a telescopic boom end position 64 are indicated by superimposition, taking the X-coordinate a as the operating radius and the Y-coordinate b as the lift of the telescopic boom.
However, when the crane is subjected to the simulation operation by the described arrangements to set the movable range, the setting is usually perfo
Komatsu Ltd.
Komatsu Mec Kabushiki Kaisha
Oen William L.
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