Measuring and testing – Dynamometers – Responsive to force
Patent
1992-06-04
1994-05-31
Chilcot, Jr., Richard E.
Measuring and testing
Dynamometers
Responsive to force
73862381, 177137, G01L 100
Patent
active
053158830
DESCRIPTION:
BRIEF SUMMARY
The present invention concerns a load measuring device for large weigh-bridges with several force measuring devices, particularly on the bodies of trucks.
Several load measuring devices for trucks are known. They can be divided into two classes: first, those that measure the axle loads; second, those that are connected between the chassis and body. The present invention therefore concerns load measuring devices of the second listed class. Several of such devices are known, thus, for example, from WO 85/02587; Brit. 2,208,935 A; U.S. Pat. No. 4,095,659; U.S. Pat. No. 4,020,911; WO 89/08568; and Brit. 2,220,758 A. The problem posed for all the listed devices is the insertion of the force measuring devices between the vehicle chassis and body. In WO 85/02587 and WO 89/08568 with the cited invention being situated just at the margin of the state of the art, this is solved in that the body being measured is supported on four struts that in each case contain a force measuring device. In Brit 2,208,935 A, the load of the vehicle body being measured acts upon elastic elements; the elastic elements deformed by the buildup of compressive- and/or shear stresses contain linear differential transformers that directly measure the changing size of the cited elastic elements. Load measuring devices for timber transporting trucks are known from U.S. Pat. No. 4,095,659 and U.S. Pat. No. 4,020,911. For example these trucks exhibit four force measuring devices. Each force measuring device comprises two symmetrically arranged flexural springs whose deflection is determined with elongation measuring strips.
It is common to all known solutions that their use stipulates either drastic modifications of the body of the truck or they are only suitable for special tasks. Generally they also take up much space in the vertical direction.
The goal that will be achieved by the present invention is the creation of a weighing device comprising several force measuring devices that can be inserted between the chassis and body without substantial interference with the structure of a truck manufactured on production lines.
Further, the load measuring device according to the invention will measure the load with a high resolution of at least 1/1000; it will support the body of a truck or the weighing platform with consideration of vertical and horizontal accelerations and will ensure the linkage of chassis/body as point connections of high firmness in all directions and will ensure moderate torsional firmness in all directions.
The achievement of the goal is depicted in Patent claim 1. The concept of the invention is explained in more detail with several practical examples by use of the attached drawings. The following are shown:
FIG. 1 an example of an overall arrangement,
FIG. 2 a first practical example in side view,
FIG. 3 a first practical example seen in longitudinal direction,
FIG. 4a, b, c a second practical example in side view, from above, and in cross section,
FIG. 5a, b a third practical example in side and longitudinal view, partially in section,
FIG. 6a, b a fourth practical example in the same view as FIG. 5,
FIG. 7a, b a fifth practical example in the same view as FIG. 5
FIG. 8a, b a variant to the practical example according to FIG. 7.
FIG. 1 depicts the vehicle structure schematically. The vehicle chassis is a frame 1 welded together from C-shaped structural sections. Details specific to the vehicle such as wheel suspension, axles, cab, and the like are not depicted. A frame 2, on a structure tailored for its application, such as platforms, box bodies, tanks, is also attached with C-shaped structural sections. Usually, chassis 1 and frame 2 are connected with each other by bolts. Further, FIG. 1 shows schematically four measuring points 3, 4, 5, 6 specified in the following practical examples. The limitation to four measuring points however is by no means essential to the invention. With long platforms, six or more measuring points can also be provided; special constructions of chassis and body can also permit three points to a
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Biegel R.
Chilcot Jr. Richard E.
Wirth Gallo Messtechnik AG
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