Abrading – Frame or mount – Portable abrader
Reexamination Certificate
2002-11-12
2004-01-13
Nguyen, George (Department: 3723)
Abrading
Frame or mount
Portable abrader
C451S048000, C451S282000, C451S267000, C451S259000, C451S349000, C451S549000, C076S108600, C076S082000, C030S457000
Reexamination Certificate
active
06676500
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a drill bit sharpener, and more particularly to a drill bit sharpener having a rotating grinding wheel with an adjustable position to sharpen drill bits, which can be assembled quickly.
2. Description of Related Art
Drilling machines and drills make holes in objects. A drill has a drill bit that is turned to make the hole in the object. A cutting edge with a relief angle is formed on one end of the drill bit. After an extensive use, the cutting edge and the relief angle of the drill bit will become dull or break. A user must replace the dull or broken drill bit with a new drill bit to keep making holes efficiently, but replacement of the drill bits is not economical.
To sharpen a dull or broken drill bit is more economical than throwing the drill bit away. A conventional bench grinder with a rotating grinding wheel is often used to sharpen drill bits. The user holds the drill bit in his or her hands and uses the rotating grinding wheel to grind a cutting edge with the appropriate relief angle on the drill bit. Using a conventional bench grinder to sharpen drill bits has some shortcomings in both operating and using. The shortcomings include the following.
1. Inconvenience operation:
Bench grinders are big and occupy a big space. The bench grinder must be mounted in a location before it can be used. The bench grinder is not easy to carry and not portable. Furthermore, holding the drill bit at the proper angle against the grinding wheel to accurately the tip is not easy. A user often much time to grind proper shape and angle on the drill bit.
2. Hazardous operation:
The grinding wheel rotates at a very high speed, and at least part of the grinding wheel is exposed to surrounding environment. The user holds the drill bit in his or her hands and may inadvertently touch the grinding wheel if he.or she is the least bit careless. The high-speed, grinding wheel will injure the user if the user touches the wheel.
To overcome the shortcomings, the present invention provides a drill bit sharpener to mitigate or obviate the aforementioned problems.
SUMMARY OF THE INVENTION
The main objective of the invention is to provide a drill bit sharpener that will sharpen drill bits easily, quickly and efficiently.
Another objective of the invention is to provide a drill bit sharpener that is portable so a user can carry the sharpener and use it on the work site.
Other objectives, advantages and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.
REFERENCES:
patent: 3803771 (1974-04-01), Bunn
patent: 4031672 (1977-06-01), Moores et al.
patent: 4069619 (1978-01-01), Escamilla
patent: 4858389 (1989-08-01), Wurscher
patent: 4974372 (1990-12-01), Chantalat
patent: 5210977 (1993-05-01), Werner
patent: 5400546 (1995-03-01), Christian et al.
patent: 5676591 (1997-10-01), Huang
patent: 5735732 (1998-04-01), Bernard
patent: 6116995 (2000-09-01), Chao
patent: 6249981 (2001-06-01), Shu
Kamrath Alan D.
Nguyen George
Rider Bennett LLP
LandOfFree
Drill bit sharpener does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Drill bit sharpener, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Drill bit sharpener will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3214116