Weighing scales – Structural installation – Vehicle
Patent
1989-06-02
1991-02-26
Miller, Jr., George H.
Weighing scales
Structural installation
Vehicle
177141, G01G 1908, G01G 1910
Patent
active
049954687
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD OF THE INVENTION
This invention relates to a load weight measuring system mounted on a construction machine, and more particularly to a load weight measuring system mounted on such kinds of machines wherein in case a dump truck and so forth is laden with a load by using a construction machine such as, for example, a wheel loader and so forth, the weight of the load actually loaded thereon by the bucket of the wheel loader is measured and compared by computation with a preset weight of the load to be laded thereon to thereby always indicate the weight of the remaining load or that which can be laded further thereon so that the overloading thereof can be prevented easily.
BACKGROUND TECHNIQUE OF THE INVENTION
Conventional load weight measuring systems of the kind specified to be mounted on construction machines are disclosed in pre-publications of Japanese Laid-open Patent Applications NOS. SHO 58-6422, SHO 59-9520, SHO 59-70919, SHO 59-75123, SHO 59-84118, SHO 59-84119, SHO 60-80721 and SHO 58-162816, and Japanese Laid-open Utility Model Application No. SHO 59-38576, etc.
These load weight measuring systems, which have already been disclosed, comprise a weight indicating unit and a printer unit.
The weight indicating unit serves to indicate the weight of one scoop of load by a bucket, and the weight of the load scooped by the bucket a number of times (or the cumulative weight of the load).
Therefore, it is satisfactory to find a half day or one day work volume. Whilst, when a dump truck is to be laden with a prescribed quantity of load, it is necessary to take on the load, for example, three or four times. However, to estimate the weight of the load to be scooped by the bucket at the final time, it is required for the operator or the driver to subtract the current indicated weight from the prescribed weight of the load in mental arithmetic. This method is troublesome and is liable to cause a miscalculation, and has posed a problem that because of overloading it becomes necessary in some cases to load the dump truck again, resulting in a waste of much labour and time.
SUMMARY OF THE INVENTION
The present invention has been made in view of the above-mentioned circumstances, and has for its object to provide a load weight measuring system mounted on a construction machine wherein the weight of the load actually laded on the machine is measured and compared by computation with a preset weight of the load to be laded on it to thereby PG,4 always indicate the weight of the remaining load or that which can be laded further on it so that the overloading thereof can be prevented easily.
To achieve the above-mentioned object, according to one aspect of the present invention, there is provided a load weight measuring system mounted on a construction vehicle, comprising: a second weight indicating unit for indicating the weight of the load actually laded on a dump truck and so forth each time as a measured weight; a first weight indicating unit for indicating a substracted weight or the weight obtained by subtracting the current cumulative measured load weight from a preset weight of the load to be laded thereon (that is to say, the weight of the load which can be laded further thereon); and controlling means for controlling the weight indication in the first and second weight indicating units with using at least the fluid pressure in a boom actuating cylinder and the boom position a detecting elements.
The above-mentioned and other advantages, aspects and objects of the present invention will become apparent to those skilled in the art upon making reference to the following description and the accompanying drawings in which a preferred embodiment incorporating the principle of the present invention is shown by way of example only.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
FIG. 1 is a schematic explanatory view illustrating the overall arrangement of one embodiment of the present invention;
FIG. 2 is a block diagram showing the configuration of a controlling means for use in the embodimen
REFERENCES:
patent: 4230196 (1980-10-01), Snead
patent: 4839835 (1989-06-01), Hagenbuch
Kabushiki Kaisha Komatsu Seisakusho
Kananen Ronald P.
Miller Jr. George H.
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