# US 9,869,578 B2 · Magnetic stirrer with mounting feet

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- Number: US 9,869,578 B2
- Document ID: US9869578B2
- Status: Granted
- Kind: B2
- Application number: 12/999,786
- Filed: 2009-05-05
- Published: 2011-05-05
- Granted: 2018-01-16
- Earliest claimed: 2008-06-24
- Assignees: IKA-Werke GmbH & Co. KG
- Applicants: Dirk Waldmann; Erhard Eble
- Inventors: Dirk Waldmann; Erhard Eble
- Web page: https://patentgrep.com/patent/US9869578B2

## CPC

- G01G 23/00: Auxiliary devices for weighing apparatus
- G01G 3/14: measuring variations of electrical resistance (G01G3/13 takes precedence)
- G01G 21/283: {Details related to a user interface}
- G01G 23/3721: {with particular representation of the result, e.g. graphic}
- G01G: WEIGHING (sorting by weighing B07C5/16)

## Abstract

A magnetic stirrer (1) has a housing (2) for accommodating a drive (3) and a holder or mounting plate (5) for a stirred vessel and a stirring magnet. A plurality of mounting feet (6) are provided for mounting the magnetic stirrer (1) on the base, which mounting feet are mounted in a movable or flexible manner and are connected to a weight measuring device or sensors belonging to a weight measuring device, with the result that the weight of the stirred material or a change in weight can be determined at any time without complicated additional weighing operations.

## Claims

### Claim 1

Magnetic stirrer comprising a weighing device for measuring a weight and a housing in which is arranged an electrical stirring drive including a rotating magnet or coils, wherein a holder or mounting plate is provided for a vessel for holding material to be stirred and a stirring magnet, the weighing device comprises deformable spring levers, each having first and second ends, the first ends being mounted to a bottom side of the housing so that the spring levers are cantilevered, and several external mounting feet are provided on the bottom side of the housing, the mounting feet are mounted on the second ends of the spring levers so that, in operation, the mounting feet are movable upwards relative to the housing against a restoring force generated by the spring levers whereby the mounting feet deform said spring levers, and a deformation of the spring levers is indicative of the weight to be measured, the housing comprises one or more recesses or openings arranged at the bottom side of the housing, and the mounting feet are at least in part moveable into the recesses or openings by application of the weight to be measured.

### Claim 2 (depends on 1)

Magnetic stirrer according to claim 1, wherein a support of the mounting feet on the housing is in active connection with the weighing device.

### Claim 3 (depends on 1)

Magnetic stirrer according to claim 1, wherein the mounting feet are provided with a transmission element to the weighing device, with the transmission element being connected to the weighing device and movable by the mounting feet.

### Claim 4 (depends on 1)

Magnetic stirrer according to claim 1, wherein all of the mounting feet are mounted in a flexible or movable way and are provided with or connected to the weighing device.

### Claim 5 (depends on 1)

Magnetic stirrer according to claim 1, wherein the levers are provided with force measurement sensors as components of the weighing device.

### Claim 6 (depends on 5)

Magnetic stirrer according to claim 5, wherein the force measurement sensors of several or all of the mounting feet are combined using a microprocessor or computer such that weight forces recorded on individual ones of the mounting feet are summed or averaged.

### Claim 7 (depends on 1)

Magnetic stirrer according to claim 1, wherein the stirrer has an electronic memory configured to store individual compositions of mixtures defined with respect to material and weight to be processed by an integrated weighing function with menu controls.

### Claim 8 (depends on 1)

Magnetic stirrer according to claim 1, wherein an operating, control, or memory unit is provided and connected detachably to the base or housing and is connected by radio frequency or by a cable to at least one of: drive parts located in the base or housing, the weighing device, or additional assemblies.

### Claim 9 (depends on 1)

Magnetic stirrer according to claim 1, wherein the mounting plate for the vessel is heated.