Monoblock sensor body and method of its manufacturing

Abstract

The invention relates to a monoblock sensor body of a load cell based on an electromagnetic force compensation mechanism, comprising a Roberval mechanism, a lever arrangement coupled on the one hand side by a coupling to the movable column of the Roberval mechanism and on the other hand side connectable to the electromagnetic force compensation mechanism and having one or more levers with respective fulcrums, the body further comprising mounting portions for mounting the fixed column of the Roberval mechanism to a housing side of a weighing module, directly or indirectly via an intermediate arrangement, and / or for mounting a load receiving member to the movable column, directly or via an intermediate arrangement, at least one mounting portion thereof comprising at least one mounting hole extending preferably at least predominantly orthogonal to the load direction, in particular along the length direction of the parallel upper and lower beam of the Roberval mechanism connected each via first and second flexure point sections with the fixed, respectively the movable column, said mounting hole comprising an inner thread such that a mating outer thread of a fixing screw screwed in the mounted state into the mounting hole up to an axial threading end can be screwed into the mounting hole, the mounting hole having one of the first upper, second upper, first lower, and second lower flexure point section as relatively closest flexure point section, whereby at least one mounting portion comprising a cavity reduces the available solid angle for straight propagation paths running from the inner thread to one or more of the closest flexure point section, coupling and the in particular closest fulcrum while a material boundary of the body closes the cavity over at least a bridging width versus the height-side end of the body corresponding to the closest flexure point section.