Working stand for neckless electrical home worker machines

A working stand for collarless electrical home worker machines, which machines have at the end of their drive shaft a threaded section for screwing on a drill chuck, comprising

• a vertical guide column having a polygonal cross-section and a toothing,
• a machine holder disposed moveably up and down said vertical guide column and fixable in position at any height on the guide column,
• a gear mounted in said holder and engaging said toothing, said gear constituting means actuatable by a hand crank,
• said machine holder comprises a pair of adjustable clamping jaws embracing said guide column,
• a vertical shaft is rotatably mounted in said machine holder, said shaft on an upper end has an axially interior threaded section means for reception of the drive shaft of the machines and said shaft on its lower end has another threaded section means for screwing-on the drill chuck, said lower end of said shaft projects from the machine holder,
• said machine holder comprises a housing formed of two housing shells, the housing being divided in a center plane of the gear or in a plane which is parallel to said center plane, both said shells of the housing are clamped rigidly to one another,
• a rearward area of said two housing shells is formed as said clamping jaws, said clamping jaws embrace said guide column, and
• a front area of said two shells is formed as another pair of clamping jaws, the latter being formed with annular grooves, said shaft is rotatably clamped in said another pair of clamping jaws,
• two axially non-displaceable roller bearings are disposed on said shaft and in said annular grooves.