Interchangeable valve system for hydraulic reversal of positive

Details Interchangeable valve system for hydraulic reversal of positive Interchangeable valve system for hydraulic reversal of positive

1981-03-17

1983-12-06

Smith, James G.

Tool driving or impacting

Self-acting advance and retraction cycle

173 29, 173 47, 173145, 408 14, 408132, 408137, B23B 4722, B23Q 520

Patent

active

044187670

ABSTRACT:
In a positive feed power drill having a spindle drive gear train and a spindle feed gear train, and having hydraulic (air) means for actuating a piston to disengage the feed gear train for automatic retraction of the spindle, provision is made for field alteration of a valve in the hydraulic system, and associated actuating mechanism, to automatically reverse the positive feed when the spindle has been driven either (1) a predetermined extent set by a nut on the spindle which engages an arm over a valve stem and pushes the valve stem to a reversing position or (2) to a predetermined stop when countersinking, at which time the spindle stops advancing, thereby causing the spindle feed gear to have a tendency to move upwardly in the spindle actuator housing. The choice is made by inserting into a valve sleeve in the housing either a valve stem with an arm for direct actuation by a spindle nut or a valve stem adapted for actuation by a system of levers to control hydraulic pressure to the piston for the same effect in the second case. The system of levers for the second choice is contained in a cap which replaces the normal cap over the actuator housing.

REFERENCES:
patent: 3512434 (1970-05-01), Juhasz et al.
patent: 3797583 (1974-03-01), Quackenbush

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