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US 6,769,184 B1Granted
Low friction rotary knife
AssigneeBettcher Industries, Inc.
InventorJeffrey A. Whited
Life of this patent
Estimating the term…
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AssigneeBettcher Industries, Inc.
InventorJeffrey A. Whited
Estimating the term…
A power operated knife including a blade supporting structure supporting an annular blade for rotation about a central axis. The blade and blade supporting structure are engagable along bearing contact locations that are spaced apart in a direction parallel to the axis so that the blade is stabilized both radially and axially as the knife operates. The blade supporting structure comprises a split blade housing member that is radially expandible and contractible to receive the blade. The split blade housing member and blade engage along relatively short lines of bearing contact that serve to minimize friction and blade heating when the knife operates. The bearing locations are spaced apart both circumferentially around the blade perimeter and in the direction of the axis so that the blade position is stabilized during operation of the knife.
A power operated knife comprising a handle, headpiece, blade support structure, and an annular blade member supported for rotation about a central axis by said blade support structure, said blade support structure comprised of a blade support member extending substantially continuously about said blade member, said blade member and blade support member engagable at least at three bearing locations spaced apart circumferentially proceeding about said axis each of said bearing locations comprising first and second lines of bearing contact spaced apart in the direction of said central axis said axially spaced lines of bearing contact suspending the blade so that the blade and blade support structure remain spaced apart except for the bearing locations.
A power operated knife comprising a blade support structure and an annular blade supported for rotation about a central axis by said blade support structure, said blade and blade support structure engagable along a line of bearing contact disposed in a plane that is transverse to said axis, and at a second line of bearing contact that is spaced from said first line of bearing contact in a direction parallel to said axis, said first and second lines of bearing contact respectively formed by first and second bearing surfaces on one of said blade and blade support structure, each first and second bearing surface converging proceeding in the direction of said central axis and each engaging a surface on the other of said blade and blade support structure along said line of contact.
A power operated knife comprising a blade support structure and an annular blade supported for rotation about a central axis by said blade support structure, said blade and blade support structure engagable along a line of bearing contact disposed in a plane that is transverse to said axis, and at a second line of bearing contact that is spaced from said first line of bearing contact in a direction parallel to said axis, said first and second lines of bearing contact formed in part by a bead on one of said blade or blade support structure, said bead projecting toward engagement with the other of said blade or blade support structure, said lines of bearing contact also formed in part by spaced bearing surfaces formed on the other of said blade or blade support structure, said bearing surfaces engaging said bead along said lines of bearing contact.
A power operated knife comprising a blade support structure and an annular blade supported for rotation about a central axis by said blade support structure, said blade and blade support structure engagable along a line of bearing contact disposed in a plane that is transverse to said axis, and at a second line of bearing contact that is spaced from said first line of bearing contact in a direction parallel to said axis, said axially spaced lines of bearing contact supporting said blade against radial and axial vibrations relative to the blade support structure while maintaining relatively low frictional resistance to blade rotation.
Dependencies are inferred from the claim text.