Power feed aline-a-drill attachment

For a power tool, a coolant system comprising:

• a double-acting cylinder having a housing, a piston and a rod, the piston being disposed within the housing and movable between a first position and a second position, the rod being coupled for movement with the piston;
• a coolant valve that is selectively operable in an inhibited condition and an enabled condition, the coolant valve being configured for controlling a flow of a pressurized coolant to the double-acting cylinder wherein placement of the coolant valve in the inhibited condition inhibits the flow of the pressurized coolant to the piston and wherein placement of the coolant valve in the enabled condition enables coolant to flow through the coolant valve to the piston;
• a two-position valve assembly that is selectively operable in a first condition and a second condition, the two-position valve assembly being configured for directing a pressurized fluid to the double-acting cylinder wherein operation of the two-position valve assembly in the first condition operably directs the pressurized fluid to the piston such that the piston moves toward the first position and wherein operation of the two-position valve assembly in the second condition operably directs the pressurized fluid to the piston such that the piston moves toward the second position;
• and
• wherein the coolant valve is a pilot-operated directional valve, the coolant valve receiving a pilot signal from the two-position valve assembly that places the coolant valve in the enabled condition and wherein the pilot signal is generated when the two-position valve assembly is placed in the second condition.

A power tool comprising:

• a drill motor having a motor housing, a motor disposed within the motor housing and a trigger valve, the trigger valve being operable in an actuated condition for selectively providing the motor with a source of fluid power;
• a double-acting cylinder having a housing, a piston and a rod, the housing being fixedly coupled to the motor housing, the piston being disposed within the housing and movable between a first position and a second position, the rod being coupled for movement with the piston;
• a two-position valve assembly that is selectively operable in a first condition and a second condition, the two-position valve assembly being configured for directing a pressurized fluid to the double-acting cylinder wherein operation of the two-position valve assembly in the first condition operably directs the pressurized fluid to the piston such that the piston moves toward the first position and wherein operation of the two-position valve assembly in the second condition operably directs the pressurized fluid to the piston such that the piston moves toward the second position;
• an arm coupled to the rod including an arm structure and an adjuster, the arm structure being coupled to the rod, the adjuster having a surface that is selectively movable relative to the arm structure to permit a point at which the control rod is brought into contact with the arm to be controlled;
• and
• a control mechanism having a housing, which is fixedly coupled to the coupling structure, and a control rod, the control rod being movable within the housing of the control mechanism between an extended position and a retracted position, the control mechanism having a biasing device for biasing the control rod toward the extended position, the control rod being configured to contact the arm to resist movement of the piston toward the second position to thereby control a rate by which the piston is advanced toward the second position;
• wherein placement of the trigger valve in the actuated condition produces a signal that is the directed to the two-position valve assembly to place the two-position valve assembly in the second condition.