Weighing scales – Structural installation – Vehicle
Patent
1991-01-08
1992-11-10
Miller, Jr., George H.
Weighing scales
Structural installation
Vehicle
177199, G01G 1908, G01G 1900
Patent
active
051616289
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a weighing device mounted on an elastically sprung vehicle for the determination of the weight of the transported goods; in particular it relates to weighing devices in which the vehicle spring suspension acts as primary spring of a spring reduction, and a force sensor is acted upon by a relatively gentle secondary spring acting parallel to the primary spring.
Such weighing devices are known per se, thus, for example, from U.S. Pat. No. 4,706,768 and numerous older publications. All have in common the feature that the stroke of the vehicle, which is typically sprung by leaf or coil springs is with respect to the wheel axles the measurement of the vehicle load. This stroke is either visually detected (thus, for example, in DE 26 40 283 A1, FR 78 27 261 A, GB 2,123,569 A), measured by means of ultrasound (U.S. 4,623,029) or ascertained over the spring pressure of a linear spring engaged parallel to the vehicle spring (U.S. 4,706,768). A parallel-switched measuring spring is known also from U.S. 3,858,173. Its length change, however, is used only for the triggering of a contact in the event that a prescribed maximum load is reached or exceeded.
The solution representing the state of the art from U.S. 4,706,768 has the disadvantage that the distance sensor which receives the part of the axle load to be led off over the measuring spring remains retracted in the normal operation of the vehicle and is to be extended only for the weighing operation. The extending mechanism provided for this is extremely complicatedly constructed and correspondingly expensive in the production and in the maintenance. The device is provided, therefore, also only for operation on the standing vehicle; during travel the distance sensor remains retracted. All the known solutions, moreover, are incapable of taking into account arbitrary inclined positions of the vehicle, although this is claimed in U.S. 4,623,029.
The problem that is to be solved with the present invention is to create a weighing device on vehicles--preferably trucks--which, on the one hand, overcomes the disadvantages of the known devices, is suitable under any practically occurring sloping of the vehicle and, in the process, correctly determines the weight of the load; this both at a standstill and also during travel. The solution of the above problem is given in the characterizing portion of patent claim 1.
With the aid of the drawing the invention is explained in detail.
FIG. 1 shows the measuring principle corresponding to the generic term,
FIG. 2 a first schematic representation of the weighing device of the invention,
FIG. 3 a second schematic representation of the weighing device of the invention,
FIG. 4 a third schematic representation of the weighing device of the invention,
FIG. 5 a first example of execution of a clinometer,
FIG. 6 a second example of execution of a clinometer,
FIG. 7 a first example of execution of a measuring system,
FIG. 8 a variant of a detail of FIG. 7,
FIG. 9 a second example of execution of a measuring system.
FIG. 1 schematically shows the measuring principle underlying the generic term. Generally represented vehicle springs 1, standing for leaf springs or coil springs, are supported each upon an end of an axle 2 and, together with other springs (not represented) carry the vehicle superstructure. A measuring spring 4 running parallel to each vehicle spring 1, the hardness of which spring 4 is substantially less than that of the vehicle spring 1, leads off a small part (corresponding to the ratio of the hardnesses) of the weight constituent of the vehicle superstructure 3 falling to this spring 1 likewise onto the axle 2. In series to each measuring spring 4 there is present in each case a force sensor 5 of a construction known per se. Essentially, each wheel (or twin wheel) of the vehicle is provided with a device according to FIG. 1. According to the construction type of the vehicle it is thinkable that in the case of a double axle chassis only the one axis is equipped with two measuring devices acco
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Miller Jr. George H.
Wirth Gallo Messtechnik AG
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