# US 7,411,138 B2 · Weighing system having an angle lever with a long vertical lever arm > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,411,138 B2 - Document ID: US7411138B2 - Status: Granted - Kind: B2 - Application number: 11/698,977 - Filed: 2007-01-29 - Published: 2007-08-23 - Granted: 2008-08-12 - Earliest claimed: 2004-07-27 - Assignees: Sartorius AG - Inventors: Fabian Walter; Otto Kuhlmann; Peter Fleischer; Wilfried Langner - Web page: https://patentgrep.com/patent/US7411138B2 ## CPC - G01G 7/02: by electromagnetic action - G01G 21/244: {combined with flexure-plate fulcrums (flexure-plate fulcrums G01G21/07)} - G01G: WEIGHING (sorting by weighing B07C5/16) ## Abstract A weighing system that operates according to the principle of electromagnetic force compensation, having two connecting rods (2, 3) which are fashioned as a parallel guide and connect a load receiver (4) to a base area (1) fixed to the housing, and having an angle lever (5) mounted on the base area. The force due to weight that is transmitted by the load receiver acts upon the short lever arm (5′) of the angle lever via a coupling element, and a coil projecting into the air gap of a permanent magnet system (7) is fastened to the long lever arm (5″). The weighing system occupies only a small area since the long lever arm takes the form of a vertical lever arm and extends, at least in part, in the area underneath the connecting rods of the parallel guide. The permanent magnet system is likewise arranged underneath the connecting rods of the parallel guide. ## Claims ### Claim 1 Weighing system operating according to the principle of electromagnetic force compensation, comprising: two connecting rods, which, in the form of a parallel guide, connect a load receiver to a base that is fixed to a housing, and an angle lever supported on the base and having a short lever arm and a long lever arm, the short lever arm being configured to receive a weight force transmitted from the load receiver via a coupling member, and the long lever arm being fixed to a coil projecting into an air gap of a permanent magnet system, wherein the long lever arm is embodied as a vertical lever arm and extends at least partially into an area below the connecting rods of the parallel guide, and the permanent magnet system is also disposed below the connecting rods of the parallel guide. ### Claim 2 (depends on 1) Weighing system as claimed in claim 1, wherein the angle lever is disposed entirely below the connecting rods of the parallel guide. ### Claim 3 (depends on 1) Weighing system as claimed in claim 1, wherein a position sensor regulating the compensation current is disposed below the permanent magnet system. ### Claim 4 (depends on 1) Weighing system as claimed in claim 1, wherein a center of gravity of the angle lever lies at least approximately at a fulcrum of the angle lever. ### Claim 5 (depends on 1) Weighing system as claimed in claim 1, wherein the base, the connecting rods, the load receiver, the angle lever, and the coupling member are integrally formed from a single metal block. ### Claim 6 (depends on 1) Weighing system as claimed in claim 1, further comprising an additional transmission lever. ### Claim 7 (depends on 1) Weighing system as claimed in claim 1, wherein the load receiver is narrower than the base. ### Claim 8 (depends on 1) Arrangement of at least two weighing systems, each as claimed in claim 1, and placed side by side such that the load receiver of one of the weighing systems is located next to the base of another of the weighing systems. ### Claim 9 (depends on 8) Arrangement as claimed in claim 8, wherein the two adjacent weighing systems are combined into a weighing system pair. ### Claim 10 (depends on 9) Arrangement as claimed in claim 9, wherein the respective permanent magnet systems of the weighing system pair are combined into a single permanent magnet system having two air gaps. ### Claim 11 A weighing system, comprising: a load receiver; a base mounted on a surface; a parallel guide interconnecting the load receiver and the base, and comprising at least two connecting rods; a magnet system; and a lever mounted to the base and comprising at least a shorter lever arm and a longer lever arm, the shorter lever arm configured to mechanically interact with the load receiver and the longer lever arm being connected to a coil configured to electromagnetically interact with the magnet system; wherein the magnet system is confined to an area between the parallel guide and the surface, and the longer lever arm extends at least partly into the area. ### Claim 12 (depends on 11) The weighing system according to claim 11, wherein the longer lever arm and the magnet system are confined to the area. ### Claim 13 (depends on 12) The weighing system according to claim 12, further comprising an additional lever mounted to the base and also confined to the area.