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US 5,007,777 AGranted
Hole saw
OwnerNoboru Itokazuinventor
Life of this patent
Estimating the term…
Abstract
A gap for allowing the cutting chips to escape is formed between the hole saw side wall and the workpiece in order to enhance the piercing efficiency. This hole saw comprises a drill part for determining the center of piercing with respect to the workpiece, a tubular part possessing plural piercing knives at the end surrounding the circumference of the drill part, and a shank part for fixing the drill part and the rear part of the tubular part and transmitting the torque from a power unit to the both, whereby at least the piercing knife disposition positions of the tubular part possess portions sequentially different in the distance from the rotary shaft.
Claims23
A hole saw comprising:
- a basal part having a coupling for joining to a rotary power source;
- a centering drill operatively mounted along a central axis of said basal part;
- and
- a tubular body having a first end joined to said basal portion and a second end provided with a cutting edge having cutting teeth, said cutting edge comprising a portion thereof having varying cross-sectional contour which locates said cutting teeth at different distances from said central axis, said cutting edge having a plurality of sections having cylindrical cross-sectional contours and a plurality of retreat sections, the retreat sections being provided between the cylindrical sections whereby a contour of said cutting edge alternates between a cylindrical section and a retreat section, the retreat sections having a cylindrical cross-sectional contour generally centered about the central axis, said cylindrical sections also being generally centered about the central axis but having a diameter therefrom which is greater than a diameter from the central axis to the retreat sections, the retreat and cylindrical sections each having a stepped portion therebetween, and each retreat section has a plurality of subsections positioned at varying distances from the central axis and interconnected by stepped portions.
1 more element
A hole saw comprising:
- a basal part having a coupling for joining to a rotary power source;
- a central drill operatively mounted along a central axis of said basal part;
- and
- a tubular body having a first end joined to said basal portion and a second end mounted to a cutting edge having cutting teeth, a lower end and sidewall portion of the cutting edge surrounds the second end of the tubular body in substantially uninterrupted contact therewith,
- said cutting edge comprising a portion thereof having varying cross-sectional contour which locates said cutting teeth at different distances from said central axis, said portion having a plurality of sections having cylindrical cross-sectional contours and a plurality of retreat sections, the retreat sections being provided between the cylindrical sections and step portions being provided between each retreat section and cylindrical section whereby a contour of said cutting edge alternates between a cylindrical section and a retreat section with a step portion therebetween.
2 more elements
A hole saw comprising:
- a basal part having a coupling for joining to a rotary power source;
- a centering drill operatively mounted along a central axis of said basal part;
- and
- a tubular body having a first end joined to said basal portion and a second end provided with a cutting edge having cutting teeth, said cutting edge comprising a portion thereof having varying cross-sectional contour which locates said cutting teeth at different distances from said central axis, said cutting edge having a plurality of sections having cylindrical cross-sectional contours and a plurality of retreat sections, the retreat sections being provided between the cylindrical sections and step portions being provided between each of the retreat sections and cylindrical sections whereby a contour of said cutting edge alternates between a cylindrical section and a retreat section with a step portion therebetween, and the cutting teeth being located only on the cylindrical sections and the retreat sections whereby the step portions are free of cutting teeth.
1 more element
Dependencies are inferred from the claim text.