US 2002/0159851 A1Published application

Twist drill for drilling having a replaceable drill tip, and a replaceable drill tip for use in a twist drill

OwnerUlrich Krenzerinventor

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Abstract

A twist drill, having a replaceable drill tip, comprising a drill bit shaft (1), a cutting insert (2) which is detachably fixed thereto and which forms the tip area of the twist drill, and comprises a flute (3) that continues into the cutting insert (2). The cutting insert rests, with a bearing surface (6) extending orthogonal to the center longitudinal axis (8) of the drill bit, on the face (7) of the drill bit shaft (1) and extends with a fixing stud (9), which centrally protrudes from the bearing surface (6), into a receiving recess (10) which is configured complementary thereto and which is provided in the face (7) of the drill bit shaft (1). At least one peripheral section (13) of the fixing stud (9) comprises a first longitudinal section (15) that, with a screw surface (16) which points away from the drill bit shaft (1), which slopes upward to the drill bit tip (5) in a direction of rotation of the drill bit, and which interacts with an opposite surface (19) on the inner wall (14) of the receiving recess (10), merges into a second longitudinal section (17).

Claims20

Dependent claims

A twist drill comprising:

a shaft comprising a first end and a second end disposed opposite said first end;
said first end of said shaft comprising a shank portion being configured to be inserted into and held by a chuck;
a replaceable drilling insert being removably attached to said second end of said shaft;
said drilling insert comprising a drill tip being configured to cut an object;
at least a first chip flute and a second chip flute;
each of said first and second chip flutes comprising a first chip flute portion disposed on said shaft and a second chip flute portion disposed on said drilling insert;
said second end of said shaft comprising a recess;
said recess comprising a bottom wall and at least one side wall disposed between said bottom wall and said end face;
said drilling insert comprising a fixing stud;
said fixing stud being configured and disposed to be inserted into said recess to removably attach said drilling insert to said shaft;
said drilling insert comprising a bearing surface disposed about said fixing stud;
said shaft comprising an end face disposed about said recess;
said drilling insert bearing surface being complementary to said shaft end face and being configured and disposed to contact and rest against said shaft end face;
said fixing stud comprising at least one projection;
said at least one projection being in the shape of a portion of a screw thread and being configured to slope away from said shaft toward said drill tip in the manner of a screw thread;
said at least one projection being disposed to run substantially less than 180 degrees around a section of the perimeter of said fixing stud from said first chip flute to said second chip flute;
said at least one side wall comprising a grooved portion;
the shape of said grooved portion of said recess being complementary to the shape of said at least one projection of said fixing stud;
said grooved portion being disposed to run substantially less than 180 degrees around a section of said at least one side wall from said first chip flute to said second chip flute;
said drilling insert being configured to be rotated, upon insertion into said recess, substantially less than 180 degrees to engage said grooved portion, in a screwing motion, with said at least one projection to screw said drilling insert into said recess to tighten and sufficiently firmly seat said drilling insert in said recess to prepare the twist drill for drilling;
and
said fixing stud comprising a first portion being disposed substantially transverse to said bearing surface and between said bearing surface and said at least one projection.

19 more elements

A method of using a drill with a replaceable drill insert, said drill insert comprising:

a drill tip being configured to cut an object;
an extending portion being configured to extend into a recess in a drill shaft to removably attach said drill insert to a drill shaft and to hold said drill insert in a drill shaft during drilling;
said extending portion comprising at least one projection;
said at least one projection being in the shape of a portion of a screw thread and being disposed to run less than 360 degrees around a section of the perimeter of said extending portion;
said at least one projection being configured to project into and engage a grooved portion in a recess in a drill shaft;
and said drill insert being configured to be relatively rotated with a drill shaft, upon insertion of said drill insert into a recess in a drill shaft, less than 360 degrees to engage a grooved portion of a recess in a drill shaft with said at least one projection to screw together said drill insert and a drill shaft to tighten and sufficiently firmly seat said drill insert in a drill shaft to prepare a drill for drilling;
said method comprising the steps of:
inserting said drill insert into a recess in a drill shaft;
aligning said at least one projection with a grooved portion in a recess in a drill shaft;
relatively rotating said drill insert and a drill shaft less than 180 degrees to engage a grooved portion of the drill shaft with said at least one projection to screw together said drill insert and the drill shaft to tighten and sufficiently firmly seat said drill insert in the drill shaft to prepare a drill for drilling;
removing said drill insert from a drill shaft by unscrewing said drill insert upon said drill insert being substantially worn as a result of drilling;
inserting a new drill insert into a recess in a drill shaft;
aligning at least one projection of said new drill insert with a grooved portion in a recess in a drill shaft;
and
relatively rotating said new drill insert and a drill shaft less than 180 degrees to engage a grooved portion of the drill shaft with said at least one projection of said new drill insert to screw together said new drill insert and the drill shaft to tighten and sufficiently firmly seat said new drill insert in the drill shaft to prepare a drill for drilling.

12 more elements

Dependencies are inferred from the claim text.

Facts

Application: 10/061,448Filed 1 Feb 2002
Priority: DE 199 36 579.23 Aug 1999
Published: 31 Oct 2002
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 codes

B23B 51/02
Tools for drilling machines: twist drills
B23B 2251/02
Details of tools for drilling machines: connections between shanks and removable cutting heads
Y10S 408/713
Cutting by use of rotating axially moving tool: tool having detachable cutting edge
Y10T 408/78
Cutting by use of rotating axially moving tool: tool of specific diverse material

Family

Application10/061,448Continuation in part · filed 1 Feb 2002
US 2002/0159851 A1This patent

From the US filing history. Foreign family members aren’t listed.

Timeline

Citations

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