Cutting by use of rotating axially moving tool – Means to drive tool – Including means to move tool along tool-axis
Patent
1991-06-13
1992-03-17
Howell, Daniel W.
Cutting by use of rotating axially moving tool
Means to drive tool
Including means to move tool along tool-axis
10136R, 10136TS, 74378, 192 21, 192 51, 408139, 408142, B23B 4714, B23G 300
Patent
active
050963430
ABSTRACT:
An internal thread forming apparatus includes a housing body fixed on a machine tool, a driving spindle connected to the rotatable main shaft of the machine tool and rotatable at the same speed as that of the main shaft, a movable body movable vertically within the housing body, a rotary lever actuatable to move the movable body downward, and a first return spring biasing the rotary lever to return to a static position. A positive-revolution driving body and a reverse-revolution driving body are carried on and are movable synchronously with the movable body, and rotate in opposite directions. A speed reduction gearing interconnects the driving spindle and the face gears so as to rotate the face gears at a speed less than that of the driving spindle. An output spindle is mounted slidably within the movable body. A tap is fastened to the output spindle. A driving block is carried on the output spindle. When the rotary lever is actuated, the movable body and the tap move downward, in such a manner that the driving block engages with the positive-revolution driving body, so as to rotate the tap in one direction. When the rotary lever is released, the driving block engages with the reverse-revolution driving body, so as to rotate the tap in the opposite direction.
REFERENCES:
patent: 2567511 (1951-09-01), Elder
patent: 3041893 (1962-07-01), Johnson
patent: 3397588 (1968-08-01), Johnson
patent: 3717892 (1973-02-01), Johnson
patent: 3998565 (1976-12-01), Tanaka
patent: 4014421 (1977-03-01), Johnson
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