Power drawbolt with planetary drive

Details Power drawbolt with planetary drive Power drawbolt with planetary drive

1978-12-20

1980-04-22

Weidenfeld, Gil

Gear cutting, milling, or planing

Milling

Cutter spindle or spindle support

408239A, B23C 526

Patent

active

041992865

ABSTRACT:
A Drawbolt is rotatably mounted within the spindle of a machine tool to secure a toolholder to a socket in the front end of the spindle. First and second spur gears are formed on the rear end of the spindle and drawbolt, respectively, and are positioned side by side. The two spur gears are equal in diameter, but have differing numbers of teeth. A planetary gear cage surrounds the spur gears and has pinion gears which are meshed with both spur gears. The planetary gear cage is attached to the armature of an electric motor which, when energized, rotates the cage and thus causes rotation of the drawbolt at a reduced speed. The speed reduction depends on the difference in the number of teeth in the two spur gears. The armature is axially shiftable to move a locking ring on the planetary gear cage into and out of engagement with the spur gear on the spindle.

REFERENCES:
patent: 2557582 (1951-06-01), Turrettini
patent: 3220313 (1965-11-01), Schroeder
patent: 3530321 (1970-09-01), Reitherman
patent: 3633457 (1972-01-01), Reeber

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