Cutting by use of rotating axially moving tool – Processes – Bit detachable
Reexamination Certificate
1998-02-17
2001-05-15
Howell, Daniel W. (Department: 3722)
Cutting by use of rotating axially moving tool
Processes
Bit detachable
C408S101000, C408S137000, C408S138000, C408S141000
Reexamination Certificate
active
06231278
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to portable power feed tools and, more particularly, to portable power feed tools used in limited access areas.
2. Description of the Prior Art
Present power feed reaming and boring operations require special equipment that is dedicated to a specific job. This equipment is bulky and requires substantial space around the area to be worked. Also, special tooling must be employed to locate power feed motors and to react to the thrust force encountered during machining. Power feed motors come set up with a given RPM and a fixed feed rate. This can be very undesirable if the operator does not have the correct combination. Only a qualified technician can change this.
The patent literature includes:
U.S. Pat. No. 885,945 which discloses a drilling machine with a differential feed mechanism.
U.S. Pat. No. 467,937 discloses a stone working machine with a feed mechanism.
U.S. Pat. No. 2,683,375 discloses a drilling machine drive.
U.S. Pat. No. 2,784,616 discloses a feed control attachment for hand tools.
U.S. Pat. No. 780,799 discloses a drill and advancement mechanism.
U.S. Pat. No. 246,938 discloses a rock drilling machine with an advancing feed mechanism.
Accordingly, it is an object of the present invention to provide useful alternatives to power feed machining.
It is a further object of the invention to provide a compact gear assembly as a means for pushing or pulling a reamer or boring cutter.
It is yet another object of the present invention to provide a differential positive feed mechanism which is externally driven by a drill motor for turning a cutter thereby allowing U-joints to access very tight areas which would not allow access by typical power equipment.
BRIEF SUMMARY OF THE INVENTION
A portable power feed tool for use in limited access areas. The differential positive feed mechanism includes a compact gear assembly that provides a means of pushing or pulling a reamer or boring cutter. The differential positive feed mechanism is externally driven by a drill motor to turn the cutter. The differential positive feed mechanism is clamped to the structure being machined as a transmission to supply feed to the cutter in limited access areas. A cutter such as a reamer is chucked to a drill motor, the speed being externally determined by the motor. On the forward end of the reamer is a threaded spindle with axial grooves running the length of the threaded spindle. The gear slips over the spindle and has dogs that engage the grooves only, allowing axial movement, but fixed radial engagement. A cluster gear train reduces to another gear which is threaded to the spindle. This threaded gear rotates at approximately 90% of the spindle speed, following for the micro advance of the cutter. Different thread pitches or gear ratios will offer different feed rates regardless of spindle RPM. The reamer or cutter may be positioned forward or aft of the threaded spindle thereby pushing or pulling the cutter.
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Gardner Conrad O.
Howell Daniel W.
The Boeing Company
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