Back to results
US 6,241,434 B1Granted
Drill, bit, drill tool, and manufacturing method of drill bit
AssigneeHouse B.M. Co., Ltd.
InventorKunio Ajimi
Life of this patent
Estimating the term…
Abstract
A drill bit and a manufacturing method thereof that ensures integral mounting of a drill and a drill holder with a simplified construction and in a simplified manner are disclosed. The drill bit has a drill with a bit and a shank, and a drill holder formed with an axial insertion hole for fitting the shank. An engaging part is formed at a base end of the drill. A blind hole that intersects the insertion hole is formed in the drill holder to form a restricting part, or a stopper equivalent to the restricting part is fitted in the bottom of the blind hole. Engagement of a top of the stopper or the restricting part with the engaging part prevents a relative rotation of the drill to the drill holder.
Claims31
A drill bit comprising:
- a drill including a bit and a shank;
- and
- a drill holder formed with an axial insertion hole to fit the shank,
- the shank formed with an engaging part,
- the drill holder formed with a blind hole extending from an outer circumference thereof in such a way as to intersect the insertion hole, and
- a stopper which is inserted in the bottom of the hole, thereby a top of the stopper engages the engaging part to restrict a relative rotation of the drill to the drill holder.
3 more elements
A drill bit comprising:
- a drill including a bit and a shank;
- and
- a drill holder formed with an insertion hole to fit the shank,
- the drill holder formed with a blind hole extending radially halfway through the insertion hole in such a way as to intersect a bottom end of the insertion hole to thereby form a restricting part at the bottom end of the insertion hole,
- the shank formed with an engaging part at an end thereof to engage the restricting part, whereby an engagement of the restricting part and the engaging part restricts a relative rotation of the drill to the drill holder.
2 more elements
A drill tool comprising:
- (a) a drill bit including:
- (a1) a drill having a bit and a shank;
- and
- (a2) a drill holder formed with an axial insertion hole to fit the shank, the shank formed with an engaging part, the drill holder formed with a blind hole extending from an outer circumference thereof in such a way as to intersect the insertion hole, and
- (a3) a stopper which is inserted in the bottom of the hole, thereby a top of the stopper engages the engaging part to restrict a relative rotation of the drill to the drill holder;
- and
- (b) a drill bit holder formed with a housing hole to concentrically house the drill bit therein.
4 more elements
A drill tool comprising:
- (a) a drill bit including:
- (a1) a drill having a bit and a shank;
- and
- (a2) a drill holder formed with an axial insertion hole to fit the shank, the shank formed with an engaging part, the drill holder formed with a blind hole extending from an outer circumference thereof in such a way as to intersect the insertion hole, and
- (a3) a stopper which is inserted in the bottom of the blind hole, thereby a top of the stopper engages the engaging part to restrict a relative rotation of the drill to the drill holder,
- wherein the insertion hole is formed in axially opposite ends of the drill holder, and the engaging part of the shank to be inserted into each of the insertion holes commonly engages the top of the stopper;
- wherein axially opposite ends of the drill holder are each shaped into a disk part identical to each other with a diameter larger than the drill, and an intermediate part of the drill holder between the disk parts is formed into a non-circular part such that a cross section thereof is a polygon or a substantial polygon with a diameter of a circumscribed circle thereof equal to or smaller than the diameter of the disk part;
- and
- (b) a drill bit holder formed with a circular drill housing hole to house one of the drills of the drill bit and a fitting hole of a circular shape in cross section to fit the disk parts of the drill holder,
- the drill bit holder provided, at a circumferential wall thereof encasing the fitting hole, an engaging member movable between an engaged position where the engaging member engages a step part formed between the rear disk part and the non-circular part to prevent loosening off of the drill bit and a relative rotation of the drill to the drill holder and a release position where the engaging member is retracted from the engaged position radially outward to allow a disengagement of the drill bit, and a retainer operable to change the position of the engaging member between the engaged position and the release position.
7 more elements
A drill tool comprising:
- (a) a drill bit including:
- (a1) a drill having a bit and a shank;
- and
- (a2) a drill holder formed with an insertion hole to fit the shank,
- the drill holder formed with a blind hole extending radially halfway through the insertion hole in such a way as to intersect a bottom end of the insertion hole to thereby form a restricting part at the bottom end of the insertion hole,
- the shank formed with an engaging part at an end thereof to engage the restricting part, whereby an engagement of the restricting part and the engaging part restricts a relative rotation of the drill to the drill holder;
- and
- (b) a drill bit holder formed with a housing hole to concentrically house the drill bit therein.
5 more elements
A drill tool comprising:
- (a) a drill bit including:
- (a1) a drill having a bit and a shank;
- and
- (a2) a drill holder formed with an insertion hole to fit the shank,
- the drill holder formed with a blind hole extending radially halfway through the insertion hole in such a way as to intersect a bottom end of the insertion hole to thereby form a restricting part at the bottom end of the insertion hole,
- the shank formed with an engaging part at an end thereof to engage the restricting part, whereby an engagement of the restricting part and the engaging part restricts a relative rotation of the drill to the drill holder;
- wherein axially opposite ends of the drill holder are each shaped into a disk part identical to each other with a diameter larger than the drill, and an intermediate part of the drill holder between the disk parts is formed into a non-circular part such that a cross section thereof is a polygon or a substantial polygon with a diameter of a circumscribed circle thereof equal to or smaller than the diameter of the disk part;
- and
- (b) a drill bit holder formed with a circular drill housing hole to house one of the drills of the drill bit and a fitting hole of a circular shape in cross section to fit the disk parts of the drill holder,
- the drill bit holder provided, at a circumferential wall thereof encasing the fitting hole, an engaging member movable between an engaged position where the engaging member engages a step part formed between the rear disk part and the non-circular part to prevent loosening off of the drill bit and a relative rotation of the drill to the drill holder and a release position where the engaging member is retracted from the engaged position radially outward to allow a disengagement of the drill bit, and a retainer operable to change the position of the engaging member between the engaged position and the release position.
7 more elements
Dependencies are inferred from the claim text.