FI91020B - Electromechanical balance - Google Patents

Abstract

An electromechanical balance comprises a balance stand, a load plate, a weighing cell and a metal/elastomer element arranged between the weighing cell and load plate. The weighing cell is designed as a flexural bar clamped at one end to the balance stand, one metal plate is screwed firmly to the free end of the flexural bar and the other metal plate is connected positively to the load plate by means of a centring pin. <IMAGE>

Description

91020 Electromechanical balance

The invention relates to an electromechanical balance according to the preamble of claim 1.

An electromechanical scale with such bending rods is known from US-A-3,512,595. In this scale, both metal plates of the metal elastomer element are screwed to the bending rod or the horizontal plate, respectively. Thus, removing and restoring the horizontal plate is simply not possible.

The object of the invention is to further develop this type of electromechanical scale so that the scale plate can be easily removed and put back in place at the lowest possible building height.

This object is solved according to the features of claim 1.

Thus, in particular, the advantage is obtained that, for example, a horizontal plate formed as a horizontal bridge can be easily removed and re-arranged for repair or cleaning.

The following description of the preferred embodiments of the invention works in conjunction with the accompanying drawings in a more detailed description thereof. The drawings show:

Fig. 1 is a schematic partial sectional view of an electromechanical balance with a bending rod, and Fig. 2 is a modified embodiment 35 of a lower configuration similar to Fig. 1.

In the electromechanical balance 1 schematically illustrated in a partial view in Fig. 1, the horizontal body 2 is fixedly fixed to the base 4, e.g. to the ground, by a leveling screw 2 in a known manner. The horizontal body 2 is made, for example, as a rectangular frame, of which Fig. 1 shows a partial view of one of its four corners. A bending rod 6 is fastened to the horizontal body 2 by means of screws 5 in one-sided and freely load-bearing manner in a manner known per se, whereby the end 7 of the bending rod 6 extends freely to the horizontal frame. The design and order of the bending rod 6, such as one piece in each corner of the body, is conventional. The bending rod is provided in an conventional manner with strain gauge strips, by means of which electrical measurement signals proportional to the conducted weighing force can be generated.

At the free end 7 of the bending rod 6, a spacer 9 is held by means of a screw 8, the lower surface of which is superficial in cross-section, for example on a round or rectangular bending rod 6. The screw 8 is screwed into the threaded hole 11 of the lower metal plate 12 of the metal-elastomer element 13 known per se, whereby the upper surface of the spacer 9 is flush with the lower surface of the metal plate 12. The element 13 further comprises an upper metal plate 14 which, together with the lower metal plate 12, encloses a layer 15 of elastomeric material, e.g. rubber or plastic, the layer 15 being attached to the plates 12, 14 in a manner known per se, in that the parts 12, The element 13 consisting of 14 and 15 is an integral part.

Attached to the upper metal plate 14 is an upwardly extending centering pin 16 which, at its free end, engages a hole 17 in the horizontal plate 18 which is tightly applied on the horizontal plate 18. The horizontal plate 18 has laterally fixed fastening screws 19 which can rest laterally on the horizontal body 2 6 excessive displacement of the supported horizontal plate 18 with respect to the horizontal body 2. The hole 17 below the horizontal plate 18 may be surrounded by a conical centering ring 21, which facilitates guiding the pin 16 into the hole. The centering screw 18 allows the horizontal plate 18 to be lifted up without any problems, as well as

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91020 3 lowering, whereby the centering rings 21 assist the entry of the centering pins 16 into the hole 17.

The horizontal stand 2 is provided under the screw 8 with a counter-screw 23 adjustable by means of a lock nut 22 5, at the end of which the end of the screw 8 strikes when the bending rod 6 is overloaded and thus limits the bending of the rod 6.

With the described details and their mutual arrangement, the horizontal technical advantages of the metal-elastomer element known per se can also be utilized in electromechanical scales with bending rods. The element 13 is primarily shaped to be rotationally symmetrical.

The modified structural shape of the electromechanical scale according to Fig. 2 differs most substantially from the scale of Fig. 1 in that the gap 9 is missing, and thus the height of the scale is reduced.

In the case of Fig. 2, the lower metal plate 12 has a projection 24 arranged according to the cross-section of the free end 7 of the bending rod 6, which is immediately superficial with the free end 7 of the bending rod 6. The fixing screw 8 is screwed directly into the threaded hole of the metal plate 12, and thus fixes the metal isoastomer element 13 to the bending rod. At the same time, the projection 24 guarantees the securing of the element 13 against distortion or lateral loading (transverse forces) during installation.

In Figures 1 and 2, the direction of the weighing force to be measured is indicated by the arrow A. Scales of the type mentioned here may be provided with bending rods 6 with two, three or four metal-elastomer elements 13, although in special cases only scales with one bending rod may be considered. at.

As illustrated in Fig. 2, the screw 8 is displaced with respect to the center pin in the direction of the longitudinal axis of the bending rod.

35 4

Instead of the bending rod 6, a so-called "cutting rod" can be used in a manner known per se. The structure and operation of the balance do not change in any way.

Claims (2)

An electromagnetic path (1) having a position-fixed weighing frame (2), with a relative load frame moving load plate 30 (18) for receiving a load intended for weighing, with at least one weighing cell attached to the weighing frame for measuring a weighing force and with a metal elastomeric element (13) arranged between the load plate and the weighing cell (13) and two elastomeric layers (12) lying therebetween and an elastomeric layer (15) therebetween for applying the weighing force to the weighing cell, the weighing cell being one side then bent or shear rod (6) on the road frame (2), the free end (7) of which is fixedly screwed together with one metal plate (12), characterized in that the other metal plate (14) is formally connected to the load plate (18) via a centering pin (16), that the free end (7) of the buoy or shear rod (6) engages moldedly in a recess (24) in the adjacent metal plate (12), and screw (8) for connecting this metal plate (12) to the free end (7) of the bending or shear rod (6) is displaced in the longitudinal direction of the bending or shear rod (6) relative to the centering pin (16). 10 Road according to claim 1, characterized in that the centering pin (16) engages a conical centering ring (21) arranged on a load plate (18). Il