Cutting by use of rotating axially moving tool – Tool-support with means to move tool relative to tool-support – To move radially
Patent
1996-01-17
1998-04-07
Rachuba, M.
Cutting by use of rotating axially moving tool
Tool-support with means to move tool relative to tool-support
To move radially
408147, 408172, 175286, 82 12, B23B 29034
Patent
active
057356505
ABSTRACT:
A drill bit including a body, a drill bit fixed onto the body, a thrust transmitting member arranged on the body and having a contact portion, and an undercut cutting member housed in a guide groove provided in the side face of the drill bit. The undercut cutting member is freely movable and provided with an undercut edge at the lower end thereof. A pull-up spring is installed to operably move the undercut cutting member, and a working force transmitting mechanism is installed on the body coupled with the thrust transmitting member and with the undercut cutting member, to press down the undercut cutting member against the resistance of the pull-up spring by the approaching movement of the body and the thrust transmitting member thereby to cause the undercut cutting edge to protrude outwardly of the drill bit body surface.
REFERENCES:
patent: 1536208 (1925-05-01), Gosper
patent: 3696454 (1972-10-01), Youtz et al.
patent: 4354559 (1982-10-01), Johnson
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patent: 4462726 (1984-07-01), Silvey et al.
patent: 4635737 (1987-01-01), Miyanaga
patent: 4992010 (1991-02-01), Fischer
patent: 4998981 (1991-03-01), Miyanaga
patent: 5310012 (1994-05-01), Centre et al.
Kabushiki Kaisha Miyanaga
Rachuba M.
Tsai Henry W. H.
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