Nut tapping machine
AssigneeInstitute for Industrial Research and Standards
InventorsSean J. Cleary, Noel L. Furlong
Life of this patent
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Abstract
The invention provides a nut tapping machine of the type driven by a drive chuck assembly comprising two sets of shank-embracing driving chucks one of which is always in engagement with the tap shank to drive it and each set is releasable sequentially from engagement with the tap shank to allow the passage of a blank along the shank. The invention solves the problems of incorrect thread form associated with other known tapping machines by providing a blank chuck assembly including a set of inwardly movable jaws each having a first flat face for engagement with the exit surface of a blank to true the blank relative to the tap.
Claims21
A tapping machine comprising:
- a base support;
- an elongated tap, having a tap shank and a threaded screw cutting portion, rotatably mounted in the support;
- a tap drive mounted on the base support;
- a tap drive chuck assembly for imparting rotary movement to the tap from the tap drive having two sets of shank embracing driving chucks longitudinally spaced apart relative to the tap shank;
- means for maintaining at least one of the sets of chucks always in engagement with the tap shank and for releasing the driving chucks sequentially from engagement with the tap shank to allow the passage of a blank along the shank;
- a blank chuck assembly, having a set of movable jaws arranged around the tap, each jaw having a first flat face for engagement with the exit surface of the blank to true the said exit surface of the blank relative to the tap axis;
- means for moving the jaws radially inwards and outwards relative to the tap;
- and
- means for imparting relative linear movement along the tap axis between the threaded screw cutting portion of the tap and the blank chuck assembly.
Dependencies are inferred from the claim text.