Abrading – Abrading process – Drill – thread – thread cutter – reamer – or rotary cutter abrading
Patent
1998-05-14
2000-08-29
Eley, Timothy V.
Abrading
Abrading process
Drill, thread, thread cutter, reamer, or rotary cutter abrading
451375, 451376, 451386, 451387, 451391, 451420, B24B 100, B24B 4106
Patent
active
061100188
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
A. Field of the Invention
This invention relates to improvements in drill bit sharpening means, and particularly to an adapter for a power tool of the general form described and shown in our PCT Applications Nos. GB93/00079 (WO93/14903) and GB95/00447 (WO95/23672).
B. Description of the Prior Art
In said PCT applications there is disclosed a powered grinding tool having a motor adapted to be driven by power supply means, a rotatable shaft drivable, in use, by the motor, and a rotatable grinding wheel to which drive is transmitted, in use, from said shaft. Such a powered grinding tool will hereinbefore be referred to as being of the kind specified. Adapters are described for releasable engagement with said tool. However the feature(s) for working an implement provided by each adapter can be provided as part of the tool if the `adapter` is formed as a non-releasable part of the tool.
SUMMARY OF THE INVENTION
According to one aspect of the invention there is provided an adapter for use with a powered grinding tool of the kind specified, the adapter comprising a body having a mounting part, and a drill bit holder engagable with said mounting part in either of two orientations, the mounting part having location means engagable, in use, by the holder and/or a drill bit carried by said holder, the arrangement being such that, in use, the drill bit can be sharpened by said grinding wheel upon engagement of the holder with said mounting part, said engagement being completed when the holder and/or the drill bit engages said location means, engagement of the holder in its said two orientations respectively allowing for sharpening of respective opposite faces/edges of the drill bit.
According to another aspect of the invention said `adapter` is formed as part of the grinding tool, instead of being separately releasably fittable thereto, so that a self-contained sharpener tool is provided.
According to a still further aspect of the invention there is provided a setting arrangement for setting, in a drill bit holder, a drill bit having a tip to be sharpened, the drill bit holder intended to be located adjacent grinding means for effecting sharpening the tip of the set drill bit, the setting arrangement comprising engagement means for releasably engaging the drill bit holder during setting, stop means for engagement by said drill tip upon longitudinal setting movement of the drill bit in said drill bit holder, and drill rotation setting means movable relative to the stop means and having an engagement surface, the operation being such that, in use, with the drill rotation setting means disposed in a forward position relative to the stop means, said longitudinal setting movement of the drill bit causes one side of the tip thereof to engage said engagement surface of the setting means and, if the tip is spaced from the stop means, to move the setting means relative to the stop means until the tip engages the stop means, the drill bit being in its correct rotational orientation when the drill bit is in engagement with the stop means, said one or another side of the drill bit tip is in engagement with said engagement surface, and rotation of the drill bit causes no movement of the setting means relative to the stop means.
Preferably the engagement surface is a surface at an angle to the direction of longitudinal setting movement of the drill bit. Desirably the engagement surface is one of a pair of engagement surfaces defining a V-shaped recess in the front of the setting means, and conveniently the surfaces converge to a central slot through the setting means which receives the stop means relative to which the setting means can slide.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be described, by way of example, with reference to the accompanying drawings, in which:
FIG. 1 is a schematic front perspective view of an adapter of one aspect of the invention for use with a powered grinding tool for sharpening drill bits, a grinding wheel of the tool also being shown,
FIG. 2 is an ex
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patent: 4547999 (1985-10-01), Reiling et al.
patent: 4658549 (1987-04-01), Lockwood
patent: 4916867 (1990-04-01), Lockwood
patent: 5788559 (1998-08-01), Jungnitsch
Eley Timothy V.
Michaelson Peter L.
Plasplugs Inc.
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