Magnetic stirring apparatus with contactless coupling between stirring shaft and stirring tool

Claim 1

A magnetic stirring apparatus, comprising a vessel; a stirring shaft having a substantially vertical axis, and an upper and a lower end; a drive connected with said upper end of said stirring shaft so as to drive said stirring shaft; a stirring tool located in the region of said lower end of said stirring shaft; a contactlessly operating coupling for transmitting a driving movement from said stirring shaft downwardly to said stirring tool, said contactlessly operating coupling being arranged between said stirring shaft and said stirring tool; a pipe inside which the stirring shaft is arranged, said pipe having a lower end formed as a cup-shaped gap pipe, said stirring shaft extending into said gap pipe and being provided with a magnetic disc, means for mounting the apparatus on said vessel so that said stirring shaft and said stirring tool extend downwardly into said vessel; bearing means rotatably by holding said stirring shaft in said pipe and including two bearings axially spaced from one another, said two bearings being located inside said vessel; and further bearing means arranged inside said vessel and rotatably holding said stirring tool on said pipe.