Abrading – Precision device or process - or with condition responsive... – With feeding of tool or work holder
Reexamination Certificate
2000-07-17
2001-09-04
Hail, III, Joseph J. (Department: 3723)
Abrading
Precision device or process - or with condition responsive...
With feeding of tool or work holder
C451S048000, C451S177000, C451S366000, C451S375000, C451S377000
Reexamination Certificate
active
06283830
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a tool bit grinder, and more specifically to a grinding control unit installed in a tool bit grinder and adapted to control the feeding of the bit to be ground relative to the grinding wheel of the grinding unit of the tool bit grinder.
A variety of manual drills, hand drills and power drills have been disclosed, and have appeared on the market. These drills commonly use a bit to cut the workpiece. Because the cutting edge of a bit wears quickly with use, it must be regularly ground with a grinder. However, because the tip of a bit has particularly curved faces, grinding a bit requires skill. An experienced master still need much time to complete the grinding of a bit. There are known various automatic tool bit grinders available on the market. However, these automatic tool bit grinders are commonly expensive, not economic to every user.
SUMMARY OF THE INVENTION
The present invention has been accomplished under the circumstances in view. It is one object of the present invention to provide a grinding control unit for a tool bit grinder, which can easily be operated to feed the bit and simultaneously to turn the bit to the desired grinding angle. It is another object of the present invention to provide a grinding control unit for a tool bit grinder, which can be easily operated to control the feeding depth of the bit when grinding the bit. It is still another object of the present invention to provide a grinding control unit for a tool bit grinder, which is simple, compact, inexpensive, and suitable for use in different working conditions. To achieve these and other objects of the present invention, there is provided a grinding control unit installed in a tool bit grinder and adapted to control the feeding of a bit relative to a grinding wheel of a grinding unit of the tool bit grinder, the grinding control unit comprising: a U-shaped support, the U-shaped support comprising a round axle suspended between two upright side walls thereof, and a coupling block turned about and moved axially along the round axle, the coupling block having one end pivoted to the round axle and an opposite end terminating in a receptacle portion; a chuck mounted in the receptacle portion of the coupling block, the chuck having a plurality of pawls disposed at a front end thereof and adapted to hold down a bit for grinding by the grinding wheel of the grinding unit of the tool bit grinder, and a gradation wheel at a rear end thereof; a swinging control mechanism adapted for enabling the chuck to be turned with the coupling block about the round axle, the swinging control mechanism comprising a roller mounted on one upright side wall of the U-shaped support, and a cam wheel mounted on the chuck to guide movement of the chuck relative to the round axle, the cam wheel comprising a radially extended peripheral flange pressed on the roller; a feeder, the feeder comprising a flange formed integral with and axially extended from one side of the cam wheel and aimed at the receptacle portion of the coupling block, the flange of the feeder having two double-beveled protruding portions spaced at 180°, a pulley mounted outside the receptacle portion of the coupling block and disposed in contact with the flange of the feeder.
REFERENCES:
patent: 4411105 (1983-10-01), Raiha
patent: 4683626 (1987-08-01), Steiner
patent: 5681209 (1997-10-01), Naumann et al.
patent: 5702294 (1997-12-01), Baltazar et al.
Baxley Charles E.
Hail III Joseph J.
McDonald Shantese
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