Boots – shoes – and leggings
Patent
1997-07-31
1998-10-13
Trammell, James P.
Boots, shoes, and leggings
455 62, 455500, G01G 1940
Patent
active
058222243
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a load weight monitoring system for monitoring the load weight of a dump vehicle (hereinafter, referred to as a dump truck) from a loading operation vehicle (hereinafter, referred to as a loader), and more particularly, to a load weight monitoring system for a dump truck for use in a system in which a plurality of dump trucks and a plurality of loaders operate in cooperation.
BACKGROUND ART
In a field, such as a quarry, where a plurality of dump trucks and loaders are systematically operated within a relatively wide working area, they usually operate in cooperation with each other. For example, when a dump truck without a load enters the quarry and stops near an operator-waiting loader, the loader loads stones, rocks, earth, and/or sand on a bed (hereinafter, referred to as a body) of the dump truck. After loading up to a maximum allowable load weight (hereinafter, referred to as a rated load weight), an operator of the loader sends a signal of load completion with a horn, etc., to an operator of the dump truck, and waits for the next dump truck without a load to arrive. The operator of the dump truck carries the loaded stones, rocks, earth, sand, etc., to a predetermined earth dumping field to discharge them, and then returns to the quarry to repeat the above operating procedure.
In a field where dump trucks and loaders are thus systematically operated, it is desirable to secure a maximum production by increasing the driving efficiency of the dump trucks and loaders. Thus, it is necessary to increase the amount that a dump truck carries at one time.
On the other hand, when the dump truck travels in a condition in which the rated load weight is exceeded, i.e., in a so-called overloaded condition, the weight greatly influences the durability of each part of the vehicle such as the vehicle body, the wheel mounting portions, and the suspension. For this reason, when traveling in an overloaded condition, the dump truck must travel at a limited vehicle speed corresponding to the overload amount, so the driving efficiency does not increase very much.
For reasons as described above, in order to obtain the maximum load weight that the dump truck can carry at one time, the operator of the loader has conventionally performed a loading operation while monitoring the load weight so that the load weight approaches as close as possible to the rated load weight of the dump truck. As an example of such a load weight monitoring system, Japanese Unexamined Patent Publication No. 6-82295 has been proposed. The load weight monitoring system includes a controller for calculating the load weight, a load weight display for displaying the calculated load weight, and a transmitter for transmitting the load weight as a signal, each provided on the dump truck. In addition, in a driver's cab on the loader, a receiver for receiving the above load weight signal and a display section for displaying the received load weight are provided.
The controller on the dump truck opens a communication link when the load weight of the dump truck changes by a predetermined weight value or more due to a first loading, and thereafter keeps on transmitting the load weight signal, and disconnects the communication link when the transmission shift lever is moved from neutral to a position other than neutral. The receiver on the loader displays the received load weight signal on the display section when the communication link is open, and switches the weight display to another display when the communication link is disconnected. In this way, the operator on the loader can learn the load weight by watching the display section, and makes a sign of load compilation to the operator on the dump truck by means of a horn, etc., provided on the loader.
However, in the above load weight monitoring system, since the same single fixed frequency is used as the radio frequency on the dump truck and on the loader, interference often occurs when a plurality of dump trucks and loaders operate simultaneously in cooperat
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Hasegawa Nobuki
Nakanishi Hitoshi
Shimura Hiroshi
Komatsu Ltd.
Miller Craig Steven
Trammell James P.
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