US 5,174,424 AGranted

Arrangement in screw thread cutting apparatus

AssigneeTapmatic International Corporation (TIC AG)

InventorAlf Eriksson

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Abstract

The invention is an apparatus for producing clutching and de-clutching particularly adaptable for use in a tapping attachment for threading holes. The clutching apparatus includes clutching members driven by the driver or driving machine and clutching members carried by the driven part. An intermediate member is provided which provides for clutching engagement and de-clutching between the members on the driving part and the members on the driven part. The clutching apparatus has the capability of producing de-clutching in response to excessive torque applied to the apparatus, and also, it has the capability of producing de-clutching in response to the tap having reached a predetermined depth and the hole being tapped. The apparatus can be built into a tapping attachment or into a tap holding adapter having the capability of quick change release, and also, the mechanism can be built directly into the driving apparatus.

Claims31

Dependent claims

An arrangement in screw thread cutting apparatus comprising a driving part, a driven part and a clutch element intermediately disposed between said driving part and said driven part, said driven part including driven part torque transmitting means, said driving part including driving part torque transmitting means and said clutch element including clutch element torque transmitting means, the clutch element torque transmitting means being engageable with the torque transmitting means of both the driving part and the driven part, the clutch element further including resilient means urging said clutch element into driving engagement with said driving part and said driven part, said resilient means being adjustable to be responsive to torque generated by operation of said screw thread cutting apparatus, said torque transmitting means of said driven part and said driving part torque transmitting means including means for moving said clutch element torque transmitting means and said driven part torque transmitting means out of engagement with each other against a force by said resilient means by an axial displacement of said clutch element at a preset value of said force exerted by said adjustable resilient means corresponding to a preset value of torque generated by operation of said screw thread cutting apparatus, said driven part torque transmitting means being moveable to disengage from said torque transmitting means of said clutch element upon reaching of a preset thread length.

Dependencies are inferred from the claim text.