Air-operated, hydraulically-controlled drillmotor

Details Air-operated, hydraulically-controlled drillmotor Air-operated, hydraulically-controlled drillmotor

1981-08-03

1984-06-12

Briggs, William R.

Cutting by use of rotating axially moving tool

Tool or tool-support with thrust-applying machine-engaging...

408 17, 408137, 173146, B23B 4724

Patent

active

044538685

ABSTRACT:
Air-operated, hydraulically controlled portable drill-countersink tool automatically clamping to workpiece. A spindle attached to drill is connected to gearing from a motor by helical splines to withdraw the spindle, to counter spindle-feeding force, responsive to encountering increased torque due to increased resistance in drilling or countersinking. In a hydraulic cylinder for collet clamping a lower air pressure is converted to higher hydraulic pressure. When drilling depth is reached, drill feeding changes to drill withdrawal and that change is triggered by blocking of an air vent by a member traveling with the spindle. A lower drill speed during countersinking is achieved by a valve reducing air supply to the motor and change in that valve is also triggered by blocking of air vent by a member traveling with the spindle. The blades of the air motor do not change in extension when loaded and the motor has constant torque.

REFERENCES:
patent: 89502 (1869-04-01), Prosser
patent: 1873404 (1932-08-01), Hild
patent: 2375991 (1945-05-01), Hoffar
patent: 2566084 (1951-08-01), Esseling
patent: 2905440 (1959-09-01), Gerentes
patent: 2909949 (1959-10-01), Winslow
patent: 2910895 (1959-11-01), Winslow
patent: 3583822 (1971-06-01), Alexander et al.

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