Gear cutting – milling – or planing – Milling – With cutter holder
Patent
1983-05-02
1985-08-20
Briggs, William R.
Gear cutting, milling, or planing
Milling
With cutter holder
279 1K, 279 60, 408240, B23Q 312, B23B 3124
Patent
active
045361134
ABSTRACT:
In a reversible power tool, such as an electric drill, a clutch mechanism is coupled to selectively connect and disconnect a chuck jaw reciprocating means to advance and retract the jaws of a chuck or to allow the chuck jaw reciprocating means to be carried in rotation with the chuck jaws. According to the improvement the clutch mechanism is decoupled as the chuck jaws approach a position of complete retraction, despite actuation of a coupling mechanism which would otherwise prevent the chuck jaw reciprocating means and the chuck jaws from turning together in rotation. The decoupling mechanism prevents damage to the chuck which occurs in prior devices when the chuck jaws are driven longitudinally beyond the designed limit for complete chuck jaw retraction. Also, an annular workpiece holder is releasably secured to the chuck to hold a workpiece in axial alignment with the tool drive shaft to safeguard against accidental injury to the fingers of an individual operating the tool. The chuck is engaged with the drive shaft at a tapered interface, in addition to a conventional threaded connection. A means is provided for immobilizing the drive shaft relative to the tool housing to facilitate removal of the chuck.
REFERENCES:
patent: 3506277 (1970-04-01), Harms
patent: 4274642 (1981-06-01), Wunsch
patent: 4323324 (1982-04-01), Eberhardt
patent: 4395170 (1983-07-01), Clarey
Briggs William R.
Thomas Charles H.
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