Mettler Instrumente Ag

Erwin Meixner

Roger Leisinger

An electronic weighing apparatus is provided, including a self-contained calibration weight module that is operated by a motor to alternately connect and disconnect, respectively, a calibration weight relative to the vertically-displaceable parallelogram-guided load receiving member of the scale. The calibration weight is normally suspended in an inoperable condition by means of a pair of internally threaded sleeves rotatably supported in the cover portion of the housing of the calibration weight module. A motor is operable to rotate the sleeves and thereby lower lifting screws threadably connected therewith, whereby the calibration weight is lowered toward a supported position between and in engagement with a pair of parallel carrier arms that extend horizontally from the load receiver.

Weighing apparatus with calibration weight means

Weighing scale having a protective enclosure

A weighing apparatus is provided with a wind shielding arrangement for protectively enclosing a load-receiving scale member. A plurality of symmetrical curvilinear concave transparent shell-like wind shield sections of unequal diameters of generation are concentrically mounted on the scale housing above the load-receiving pan for relative rotational movement about a common axis between a closed protective condition, and an open condition affording access to the scale pan. In one embodiment, a pair of shield sections have generally coplanar edge portions mounted in a pair of concentric circular grooves, respectively, contained in a support on the upper surface of the housing adjacent the load receiving member. The inner shield section is retained in its associated groove by a resilient annular retainer ring that extends radially outwardly above a radially inwardly extending lip portion on the lower edge of the inner shield section.

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Volkertswil, Switzerland

Erwin Meixner