Pass-over tapping apparatus
AssigneeNutap Schuhl & Co. GmbH
InventorErnst Thun
Life of this patent
Estimating the term…
Abstract
Immediately behind a tap of an automatic threading machine to which nuts or like pieces are fed in succession, is a straight portion of a cast-off sheet coaxial with the tap and which is followed by an inclined portion including an obtuse angle with the straight portion. Another straight portion parallel to the first includes an obtuse angle with the inclined portion and guide passages are formed around the inclined portion and the final parallel portion in a head which is rotated to drive the tap. The nuts thus pass over the tap and the cast-off shaft and axial play of the cast-off shaft is minimized.
Claims10
A pass-over tapping apparatus which comprises:
- a cast-off shaft from a smooth trailing end of which tapped workpieces are discharged;
- a thread cutter at a leading end of said cast-off shaft for cutting an internal thread in a workpiece blank to form a tapped workpiece, the tapped workpieces passing in succession over said thread cutter and along said cast-off shaft, said cast-off shaft being an offset shaft having:
- a straight upstream portion formed with said leading end and coaxial with said thread cutter,
- a straight intermediate portion disaligned from said upstream portion and including an obtuse angle with said upstream portion, and
- a straight downstream portion disaligned from said intermediate portion and including an obtuse angle with said intermediate portion and parallel to said upstream portion;
- means for rotating said cast-off shaft and said thread cutter about an axis of said thread cutter while each workpiece in which a thread is cut is held against rotation to effect cutting of the respective thread and cause the respective workpiece to advance axially on said thread cutter and pass to said trailing end of said cast-off shaft by shifting of preceding workpieces along the shaft by workpieces following from said thread cutter;
- and
- means for collecting tapped workpieces cast off from said trailing end.
An assembly for use in a pass-over tapping apparatus, comprising:
- a cast-off shaft from a smooth trailing end of which tapped workpieces are discharged;
- and
- a thread cutter at a leading end of said cast-off shaft for cutting an internal thread in a workpiece blank to form a tapped workpiece, the tapped workpieces passing in succession over said thread cutter and along said cast-off shaft, said cast-off shaft being an offset shaft having:
- a straight upstream portion formed with said leading end and coaxial with said thread cutter,
- a straight intermediate portion disaligned from said upstream portion and including an obtuse angle with said upstream portion, and
- a straight downstream portion disaligned from said intermediate portion and including an obtuse angle with said intermediate portion and parallel to said upstream portion.
Dependencies are inferred from the claim text.