Grinding device
AssigneeInstitute for Industrial Research and Standards
InventorMohammad Afshar
Life of this patent
Estimating the term…
Abstract
A hand held grinding device for sharpening drill bits comprises a pair of bearing members which rotatably support a grinding wheel fast on a shaft. Portion of the shaft is engagable with the chuck of a drill. A guide plate with grooves for various size ranges of drill bits is hingedly connected to the bearing members by a plastics hinge. The grooves direct the drill bit to the grinding wheel at an angle of 59.degree.. By pivoting the guide plate relative to the bearing members, the trailing portion of the cutting edge of the drill bit is relieved.
Claims11
A hand-held grinding device for grinding a drill bit or other tool, the device comprising:
- a grinding wheel supporting body member,
- a shaft rotatably mounted in the supporting body member for rotation about a rotational axis,
- the shaft having a free end for attachment to a chuck,
- a grinding wheel mounted on the shaft and having a peripheral grinding surface,
- a tool guide member having a groove means to receive and direct a tool for the grinding wheel, the guide member being configured for gripping in one hand with a user's thumb holding a tool in the guide means,
- the tool guide member being pivotally mounted to the grinding wheel supporting body member for pivotal movement about a pivot axis,
- the pivot axis between the tool guide member and the grinding wheel supporting body member being spaced apart from and substantially parallel to the rotational axis of the grinding wheel.
Dependencies are inferred from the claim text.