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US 5,813,802 AGranted
Drilling tool assembly and its center drill and cup shape drill
AssigneeHouse B.M. Co., Ltd.
InventorsKunio Ajimi, Tsuneyoshi Ajimi
Life of this patent
Estimating the term…
Abstract
A center drill used for machining a hole in a work piece which is adapted to be partially enclosed in a cup shape drill member in a side view thereof, includes a drill portion provided on a leading end of the center drill, and a dust extractor radially outwardly extending from a portion of the center drill which is enclosed in the cup shape drill member.
Claims17
A cup shape drilling tool assembly comprising:
- a cup shape drill member including tip on a leading end thereof;
- a center drill partially enclosed in the cup shape drill member in a side view thereof, including;
- a drill portion formed on a leading end of the center drill,
- a dust extractor radially outwardly extending from a portion of the center drill lying in the sup shape drill member
- a tool chucking device for securely holding the center drill at a middle of the cup shape drill member in a plan view.
2 more elements
A cup shape drilling tool assembly comprising:
- a cup shape drill member including
- a plurality of cutting tips provided on a periphery of an opening end of the cup shape drill member, having at least one inwardly protruding tip which projects further radially inwardly of the rest of the cutting tips and all the inwardly protruding tips lie in an arc of 180 degree at one end of the cup shape drill member;
- a center drill partially enclosed in the cup shape drill member in a side view thereof, including;
- a drill portion formed on a leading end of the center drill projects axially outwardly from the opening end of the cup shape drill member,
- a tool chucking device for securely holding the center drill at a middle of the cup shape drill member in a plan view.
2 more elements
A cup shape drilling tool comprising:
- a tubular body having a leading end;
- first cutting tips provided at the leading end of the tubular body and protruding radially inward;
- and
- second cutting tips provided at the leading end of the tubular body and protruding radially inward, wherein the second cutting tips protrude radially inward farther than the first cutting tips, each of the second cutting tips protrude radially inward a substantially equal distance, and all of the second cutting tips arranged in an arc of no more than 180 degrees.
1 more element
Dependencies are inferred from the claim text.