초록 ▼

Apparatus is disclosed for threading tapping holes in workpieces wherein the tapping hole is surrounded by a surface having alternating recesses and arcuate projections which are to be threaded. The apparatus has a hold-down plate one side of which is movable against the exposed side of the workpiec

Apparatus is disclosed for threading tapping holes in workpieces wherein the tapping hole is surrounded by a surface having alternating recesses and arcuate projections which are to be threaded. The apparatus has a hold-down plate one side of which is movable against the exposed side of the workpiece, a carrier which is reciprocable toward and away from the workpiece by a plunger and a spring, a tool holder which has external threads meshing with the internal threads of a nut in the hold-down plate and a helical cam groove receiving a pin of the carrier, and a fluted tap which is coaxially affixed to the holder and extends into the tapping hole when the hold-down plate abuts against the workpiece whereby the externally threaded ribs of the tap which alternate with the flutes extend into the recesses in the surface surrounding the tapping hole. The carrier is thereupon moved toward the hold-down plate to cause the tool holder to rotate whereby the tool holder moves axially and the tap cuts or rolls threads into the projections between the recesses in the surface surrounding the tapping hole. The length of the cam groove determines the extent of rotation of the tap, and such extent is selected with a view to ensure that each rib of the tap moves from a preceding recess into the next-following recess when the surface bounding one end of the cam groove terminates the movement of the carrier toward the hold-down plate. The carrier, the means for moving the carrier and the hold-down plate can constitute parts of a stamping machine.

대표청구항 ▼

Apparatus for threading a tapping hole having internal projections which alternate with recesses for externally threaded ridges of a fluted tap, said apparatus comprising: (a) a hold-down device having a side movable against a workpiece provided with a tapping hole to be threaded, said device also h

Apparatus for threading a tapping hole having internal projections which alternate with recesses for externally threaded ridges of a fluted tap, said apparatus comprising: (a) a hold-down device having a side movable against a workpiece provided with a tapping hole to be threaded, said device also having an internally threaded portion; (b) a holder mounted for rotation and having external threads meshing with the internal threads of said internally threaded portion so that rotation of said holder entails axial movement thereof and said holder is guided by said device; (c) a tap mounted in said holder and having substantially parallel flutes alternating with substantially parallel, externally threaded ribs; (d) a carrier for said device movable with reference to the latter; (e) cooperating guide means on said carrier and said holder arranged to rotate said holder in response to relative movement of said carrier and said device; and (f) limiting means for limiting rotation of said holder to a predetermined angle which corresponds to a fractional revolution of said tap.