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US 5,143,490 AGranted
Bit for cutting sheetrock
AssigneeRoto Zip Tool Corporation
InventorRobert K. Kopras
Life of this patent
Estimating the term…
Abstract
Disclosed is a bit which can be cut both axially and laterally, and which is especially useful to cut an access opening in a sheetrock panel covering an electrical outlet box. The bit self-guides itself laterally around the periphery of the outlet box so that the opening will correspond to the shape of the box. The configuration of the bit permits it to be made in an unusually small diameter so as to minimize the width of the slot it cuts.
Claims11
A bit for cutting axially and laterally through a sheetrock panel, said bit comprising,
- a tip for cutting axially,
- a plurality of body flutes for cutting laterally, said flutes forming a spiral on said bit which extends toward said tip in a direction which, when the bit is rotated in use, tends to resist advancement of the bit into a panel being cut,
- an unfluted annular band extending around said bit between said tip and a leading end of said spiral, said unfluted band providing a bearing surface on which said bit can be guided around an electrical outlet box to cut a panel covering said box, and
- a shank by which said bit can be chucked.
1 more element
Dependencies are inferred from the claim text.