Hole-cutting tool with a free central portion and ejector appara

Cutting by use of rotating axially moving tool – With means to apply transient – fluent medium to work or product – Including tool with duct

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Details

408186, 408204, 408231, 408703, B23B 2710, B23B 5100, B23B 4102

Patent

active

041294017

ABSTRACT:
A hole-forming tool comprising a body adapted for being driven in rotation and including a front portion having an axial bore. A plurality of cutting plates are removably secured to the front face of the front portion of the body for cutting a ring of material from a metal workpiece while leaving a non-cut core in the axial bore. The body carries an ejector in the bore for ejecting the core at the end of the cutting operation. The ejector can be a slidable member which is resiliently urged into the bore and which opposes the core to effect displacement thereof from the workpiece when the tool has completely cut through the workpiece. A system is also provided for axially distributing a lubricating liquid through the bore to the cutting plates.

REFERENCES:
patent: 2184919 (1939-12-01), Miller
patent: 2484150 (1949-10-01), Brown
patent: 3591306 (1971-07-01), Kaser
patent: 3950111 (1976-04-01), Churchwell et al.

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