(51) Int. Cl.³ = Int. Cl.² Int. Cl.²: G 01 G 3/14

(19) Federal Republic of Germany G 01 G 1/24

[emblem] G 01 G 19/12

German Patent Office

(11) Offenlegungsschrift 28 47 499

[Published Patent Application]

(21) Application number: P 28 47 499.9

(22) Filing date: November 2, 1978

(43) Disclosure date: May 14, 1980

Property of the

(30) Union Priority: [illegible] Library

(32) (33) (31) - June 11, 1980

(54) Title: Electromechanical Weighing Scale

(71) Applicant: Pfreundt, Hans-Günther, 4286 Südlohn

(72) Inventor: same as the applicant

DE 28 47 499 A1

Patent Claims:

1. Electromechanical weighing scale, preferably in the shape of a pallet, with a bearing plate, on which the object(s) to be weighed can be deposited and with a display for the weight to be measured, characterized in that the bearing plate (1) is supported by at least two mutually parallel beams (2), which are arranged under said bearing plate, at least at four points, which are spaced apart from each other and which are arranged symmetrically to the central axis of the plate, each of the beams (2) themselves being supported at two points, which are arranged symmetrically to their center; which are spaced apart from each other; and that each of the beams has at least one strain gauge (5); and that, furthermore, there is a display unit (10), which converts the resistance values of the strain gauges (5) into weight values.

2. Weighing scale, as claimed in claim 1, characterized in that the center of the support beams (2) exhibits on one side a rounded recess (4);

and the opposite side of the beam exhibits the strain gauge (5).

3. Weighing scale, as claimed in claim 1 or 2, characterized in that the supports (11) for the bearing plate (1) are spaced apart outside of the supports (6) of the beam (2).

4. Weighing scale, as claimed in any one of the claims 1 to 3, characterized in that it exhibits a frame (3), on which the supports (6) of the beams (2) are mounted; that rollers (7) are mounted on the frame at the bottom and at the top a handle (8) is attached by means of two struts (9); and that the display unit (10) is fastened to one of the struts (9).

Applicant:

Hans-Günther Pfreundt

4286 Südlohn

Electromechanical Weighing Scale

The invention relates to an electromechanical weighing scale, preferably in the shape of a pallet, with a bearing plate, on which the object(s) to be weighed can be deposited and with a display for the weight to be measured.

It is already known to weigh pallets and other objects by means of mechanical weighing scales. In this case the mechanism accepts the entire load by means of moveable members; and their motion is displayed in turn either by mechanical means or, following conversion into an electric signal, is displayed by analog or digital means. However, the drawback with these weighing scales known in the prior art is the high mechanical complexity, so that, as a rule, these weighing scales cannot be moveable; they are expensive, susceptible to breakdowns and complicated. This is especially true, when loads of higher weight have to be weighed. Therefore, it is not customary at this time to populate, for example, a warehouse with a plurality of scales in order to be able to weigh simultaneously at different locations.

Moreover, it is not possible to use weighing scales as transport carts for goods or as pallets, so that

it is sometimes necessary to unload from the transport means and to load onto the weighing scale.

It is the object of the invention to avoid these drawbacks and to provide a weighing scale that is constructed in a very simple way, is easy to handle and can also be used cost effectively as a transport means or a pallet.

The invention solves this problem in that the bearing plate is supported by at least two mutually parallel beams, which are arranged under said bearing plate, at least at four points, which are spaced apart from each other and which are arranged symmetrically to the central axis of the plate. Each of the beams themselves is supported at two points, which are arranged symmetrically to their center and which are spaced apart from each other; each of the beams has at least one strain gauge. Furthermore, there is a display unit, which converts the resistance values of the strain gauges into weight values.

The invention provides advantageously for the purpose of making the weighing scale suitable as a means of transport that the weighing scale can be designed in such a manner

that it exhibits a frame, on which the supports of the beams are mounted; that rollers are mounted on the frame at the bottom and at the top a handle is attached by means of two struts; and that the display unit is fastened to one of the struts.

In detail, one side of the beam exhibits a rounded recess for measuring especially accurately in the center of the support beams; and the opposite side of the beam exhibits the strain gauge.

In order to set a weighing line of the beams carrying the strain gauges that is suitable for the measurement, the supports for the bearing plate are spaced apart outside of the supports of the beams.

Obviously the innovative solution is especially simple and yet effective. Moreover, it is absolutely surprising to the person skilled in the art that it is possible to achieve a very high accuracy of measurement that makes it practical to employ a digital indicating display unit. Hence, it can be considered to be the ideal solution to the above described problems.

One embodiment of the invention is described in detail below with reference to the drawings.

Figure 1 is a perspective view of a weighing scale; and

Figure 2 is a sectional view of the bearing and measuring unit of the scale.

The weighing scale consists of a frame 3 with trailing rollers 7, which are hinged to said frame at the bottom, and on one side with a handle 8, which is mounted by means of two struts 9. This handle runs horizontally and is mounted approximately at the working height of a working person. The display unit 10 is mounted on one of the struts 9 in the optimal viewing field of the personnel. Furthermore, it is mounted, when viewed from the direction of the strut 9, internally behind the handle 8, in order to prevent it from being damaged.

The display unit is digital and, on reaching an adjustable maximum load, can emit an optical or acoustical warning signal. The display unit has the electronic units, which

evaluate the electrical signals, coming from the strain gauges and convert these electrical signals into weight values. Such display units are known, are at the discretion of the person skilled in the art and, therefore, do not have to be described in detail.

Above the frame 3 there are supports 6, which are spaced apart from each other and the arrangement of which is symmetrical to the central axis of the plate; at least two transverse beams 2, so that the mounting on the supports 6 allows the ends of the beams to be twisted somewhat - that is, the setting of a normal weighing line.

The beams 2 are round in the middle - that is, in the shape of a sector of a circle - or rounded off - that is, also cut out so as to be oval or elliptical (at 4). Then on the opposite side of the beam there are the strain gauges 5, which are connected to the display unit 10 by means of suitable connecting cables.

The bearing plate 1 is made advantageously of a material that is designed stiff to resist deformation. The bearing plate rests on additional supports 11, which are mounted on the beam 2 and are also arranged symmetrically to the central axis of the plate.

Furthermore, the exact configuration point is outwards from the supports 6, so that the ends of the beam 2 are bent downwards, and the center arches upwards at the notch 4. For the sake of a better overview this arrangement can also be configured for the person skilled in the art in such a manner that, on loading the bearing plate, the line of flexure moves downward as the center of the beam moves.

In an additional embodiment of the invention, the system can also be used to determine loads that are conveyed on conveyor belts. To this end, an intermediate belt is mounted on the pallet-like bearing plates 1. This intermediate belt, which is then supported, for example, by two bearing plates, is weighed with the material located on it. The belt empties itself, for example, by tossing the material on another transport belt and then can be refilled again, for example, even from a transport belt.

The inventive weighing scale is provided in an advantageous manner with a chargeable battery, which delivers the necessary electrical energy for the display unit. Thus, the use of the weighing scales is independent of location and power mains. Moreover, in the periods of immobilization - for example, at night - the weighing scales can be recharged without any problems.

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Number: 28 47 499

Int. Cl.²: G 01 G 3/14

Filing date: November 2, 1978

Disclosure date: May 14, 1980