Portable peck feed drilling system
AssigneeCooper Industries, Inc.
InventorsChris Johnson, Ed Deremo
Life of this patent
Estimating the term…
Abstract
A peck feed drill incorporates a motor gear quill and a feed control assembly together on a moving race track shaped piston. External construction of the housing permits mounting of an indexing adaptor plug for attachment of drill bushings. Internal construction of the housing provides for passage of air to the various components to which control tool operation. Valves within the air logic circuitry are multi-functional to minimize the number of parts.
Claims16
An air logic circuit for a peck feed drill comprising:
- a control module comprising:
- a pulse valve;
- a first shuttle valve;
- a second shuttle valve;
- a third shuttle valve;
- said first, second and third shuttle valves being connected together in series;
- a stop valve;
- said stop valve being connected in series with said first shuttle valve and in parallel with said pulse valve;
- an operating module comprising:
- a master valve;
- a setback control assembly;
- a power valve;
- said power valve connected in series with said master valve;
- said power valve connected in series with said shuttle valves;
- and
- said master valve being connected in series with said first and second shuttle valves;
- a running module comprising:
- a motor/cushion valve;
- and
- a depth control rod valve assembly;
- a drilling module comprising:
- an equal drill time valve;
- a peck timer assembly;
- and
- a depth control valve.
An air logic circuit for a peck feed drill, comprising:
- a piston assembly including a piston;
- a power valve in fluid connection to the piston assembly, the power valve being operable in a first position wherein high pressure air urges the piston in a retract direction and operable in a second position wherein high pressure air urges the piston in a thrust direction;
- a master valve for controlling the power valve;
- a passage in the piston assembly for directing air from the piston assembly to the master valve when the piston is fully retracted;
- and
- the master valve includes means for switching the power valve from the first position to the second position when the master valve receives the air from the passage in the piston assembly.
An air logic circuit for a peck feed drill having an air motor, comprising:
- a piston assembly including a piston;
- a power valve in fluid connection with the piston assembly, the power valve being operable in a first position wherein high pressure air urges the piston in a retract direction and operable in a second position wherein high pressure air urges the piston in a thrust direction;
- and
- a valve assembly including an output port for directing high pressure air to the air motor so as to drive the air motor, said valve assembly further including a first port for receiving high pressure air from the piston assembly when the power valve is in the first position and a second port for receiving high pressure air from the piston assembly when the power valve is in the second position, both said first port and said second port being connectable to the output port so that high pressure air may be directed to the air motor when the piston is being retracted and being thrusted.
Dependencies are inferred from the claim text.