Hole cutting tool with drill pilot

Details Hole cutting tool with drill pilot Hole cutting tool with drill pilot

2000-03-27

2002-04-23

Howell, Daniel W. (Department: 3722)

Cutting by use of rotating axially moving tool

Tool or tool with support

Having axial, core-receiving central portion

C408S204000, C408S209000, C408S057000

Reexamination Certificate

active

06375396

ABSTRACT:

BACKGROUND AND SUMMARY OF THE INVENTION
Annular hole cutting tools typically have an arbor connected to an annular, hollow cutter for cutting a hole in a workpiece. A pointed ejector member, or pilot drill, is mounted in the cutter. As the rotating arbor is advanced toward the workpiece, the drill drills a pilot hole into the workpiece to center the annular cutter.
A similar device is illustrated in U.S Pat. No. 4,408,935 issued Oct. 11, 1983 to Masaaki Miyanaga for “Metal Borer”. A set screw on the spindle engages a groove in the ejector to prevent it from being totally ejected from the spindle. If the set screw is removed from the groove, a spring will tend to totally eject the pointed ejector member from the arbor, creating a dangerous situation.
The broad purpose of the present invention is to provide an arbor assembly for supporting both a hole cutter and a spring-biased drill pilot. A set screw connects the arbor to the hole cutter so that they rotate as a unit. A second set screw on the arbor engages a longitudinal flat surface on the drill pilot to permit it to move axially with respect to the hole cutter, while rotating with the arbor. The inner end of the drill pilot has a collar that is larger than the diameter of the center bore of the hole cutter so that the drill pilot cannot pass through the hole cutter in the event the second set screw is disengaged from the flat on the drill pilot.
Still further objects and advantages of the invention will become readily apparent to those skilled in the art to which the invention pertains upon reference to the following detailed description.


REFERENCES:
patent: 3825362 (1974-07-01), Hougen
patent: 4385853 (1983-05-01), Strange et al.
patent: 4408935 (1983-10-01), Miyanaga
patent: 4624608 (1986-11-01), Shiomi et al.
patent: 5062748 (1991-11-01), Kishida
patent: 5240357 (1993-08-01), Omi
patent: 5281060 (1994-01-01), Strange et al.
patent: 5316418 (1994-05-01), Miyanaga

Affiliated with

Also associated with

Rating

Hole cutting tool with drill pilot does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Hole cutting tool with drill pilot, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hole cutting tool with drill pilot will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2890565