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US 2017/0252834 A1Published application
Hole-saw
OwnerThomas J. Sperainventor
Life of this patent
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OwnerThomas J. Sperainventor
Estimating the term…
A hole-saw comprises a cylindrical body, a plate, a mandrel, and a clamping member. A cutting edge is formed at an open end of the body and is disposed about the body's rotational axis. The plate is disposed at an opposite end of the body, is rotationally coupled to the body, and is oriented perpendicular to the body's rotational axis. In one embodiment the plate has lateral slots formed through the plate and lateral grooves formed in the plate's distal surface in an orientation transverse to the slots. The mandrel's proximal section forms an arbor shaft, and its distal section includes lateral bosses sized to insert through the plate's slots and rest in the plate's grooves. The clamping member has a body that is movable along the mandrel's longitudinal axis to engage the plate's proximal surface and clamp the plate between the clamping member and the bosses resting in the plate's grooves. Other embodiments include a cylindrical body with a cutting edge at both ends. Either cutting edge can have an inner or an outer tooth to easily remove the plug. The pilot drill bit can have a burr to prevent jamming.
A mandrel assembly for a hole saw, said mandrel assembly comprising:
A mandrel assembly of claim l,wherein the distal open end with primary saw teeth further comprises at least one inner tooth means functioning to cut a workpiece at a smaller diameter than the primary saw teeth.
A mandrel assembly for a hole saw, said mandrel assembly comprising:
A mandrel assembly for a hole saw, said mandrel assembly comprising:
Dependencies are inferred from the claim text.