Hole saw

Details Hole saw Hole saw

1992-10-05

1993-04-27

Howell, Daniel W.

Cutting by use of rotating axially moving tool

Tool or tool with support

Having axial, core-receiving central portion

408144, 408207, B23B 5105

Patent

active

052056856

ABSTRACT:
A hole saw, especially suited for sheet-metal work, incorporates an annular ring surrounding the body of the saw, and located at an end adjacent its cutting edge. In accordance with the invention, the diameter of the ring is selected larger than that of the cutting teeth, to operate as a "stop" in preventing the saw from undesirably extending into the cavity where the saw makes its cut, beyond a predetermined amount. As will be described, the annular ring allows for a constant, equal pressure to be applied in using the hole saw across a work-piece while, at the same time, limiting any accidental damage to be done inside the work-piece if the hole saw were to penetrate too far.

REFERENCES:
patent: 1522102 (1925-01-01), Cibelli
patent: 4297059 (1981-10-01), Miyanaga
patent: 5082403 (1992-01-01), Sutton et al.
patent: 5147164 (1992-09-01), Fraver

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