Tool coupling arrangement for drills and reamers

Patent metadata

Field	Value
Publication number	US-9597737-B2
Application number	US-201514696989-A
Country	US
Kind code	B2
Filing date	Apr 27, 2015
Priority date	Apr 27, 2015
Publication date	Mar 21, 2017
Grant date	Mar 21, 2017

Abstract

A tool coupling arrangement for drills and reamers includes tool and shank portions with respective tool and shank axial stoppers. An at least partially cylindrical tool coupling end of the tool portion is located within a longitudinal through forward bore portion in the shank portion, and being coupled therein via an elongated coupling member located further inwards in the shank portion and comprising axially opposite member coupling and pulling ends. The forward bore portion has front and rear sub-portions and a bore recess which is located therebetween and extends radially outwardly. In a locked position, the tool axial stopper abuts the shank axial stopper. The tool coupling end abuts the front and rear sub-portions. And the member coupling end is wedged between the tool coupling end and the bore recess.

First claim

What is claimed is:

1. A tool coupling arrangement ( 12 ) for drills and reamers comprising tool and shank portions ( 14 , 16 ) with respective tool and shank axial stoppers ( 46 , 48 ),
an at least partially cylindrical tool coupling end ( 24 ) of the tool portion ( 14 ) being located within a longitudinal through forward bore portion ( 76 ) in the shank portion ( 16 ), and being coupled therein via an elongated coupling member ( 18 ) located further inwards in the shank portion ( 16 ) and comprising axially opposite member coupling and pulling ends ( 56 , 58 ); wherein
the forward bore portion ( 76 ) comprises axially-separate cylindrical front and rear sub-portions ( 76 F, 76 R) and a bore recess ( 80 ) which is located therebetween and extends radially outwardly relative to both the front and rear sub-portions ( 76 F, 76 R); and wherein
in a locked position, the tool axial stopper ( 46 ) abuts the shank axial stopper ( 48 ), the tool coupling end ( 24 ) abuts the front and rear sub-portions ( 76 F, 76 R), and the member coupling end ( 56 ) abuts the tool coupling end ( 24 ) and the bore recess ( 80 ).

2. The tool coupling arrangement ( 12 ) according to claim 1 , wherein the tool and shank portions ( 14 , 16 ) comprise parallel respective tool and shank axes (T, S).

3. The tool coupling arrangement ( 12 ) according to claim 1 , wherein the forward bore portion ( 76 ) opens out to a shank forward surface ( 74 ), and the bore recess ( 80 ) increases in depth in a longitudinal direction towards the shank forward surface ( 74 ).

4. The tool coupling arrangement ( 12 ) according to claim 1 , wherein the bore recess ( 80 ) is conical.

5. The tool coupling arrangement ( 12 ) according to claim 2 , wherein the bore recess ( 80 ) extends 360 degrees about a longitudinal shank axis (S).

6. The tool coupling arrangement ( 12 ) according to claim 1 , wherein:
the bore recess ( 80 ) comprises a first bore abutment surface ( 82 ) and the rear and front sub-portions ( 76 R, 76 F) comprise respective second and third bore abutment surfaces ( 84 , 86 ); and
the first bore abutment surface ( 82 ) is located radially opposite the second and third bore abutment surfaces ( 84 , 86 ).

7. The tool coupling arrangement ( 12 ) according to claim 1 , wherein the tool coupling end ( 24 ) has a planar first tool abutment surface ( 44 ) which abuts a planar inner abutment surface ( 68 ) of the member coupling end ( 56 ).

8. The tool coupling arrangement ( 12 ) according to claim 1 , wherein the member coupling end ( 56 ) comprises radially opposite inner and outer abutment surfaces ( 68 , 70 ).

9. The tool coupling arrangement ( 12 ) according to claim 8 , wherein the inner abutment surface ( 68 ) is planar and the outer abutment surface ( 70 ) is conical.

10. The tool coupling arrangement ( 12 ) according to claim 8 , wherein the inner and outer abutment surfaces ( 68 , 70 ) converge towards the member pulling end ( 58 ).

11. The tool coupling arrangement ( 12 ) according to claim 1 , wherein each of the tool and member coupling ends ( 24 , 56 ) is asymmetric.

12. The tool coupling arrangement ( 12 ) according to claim 8 , wherein in the axial direction, the tool coupling end ( 24 ) abuts the inner abutment surface ( 68 ) between two axially separate sides of the bore recess ( 80 ).

13. The tool coupling arrangement ( 12 ) according to claim 1 , wherein the member pulling end ( 58 ) comprises a male thread ( 62 ) which is screw threaded into a female thread ( 64 ) located in a rearward bore portion ( 78 ) of the shank portion ( 16 ).

14. The tool coupling arrangement ( 12 ) according to claim 1 , wherein the tool coupling end ( 24 ) has a planar first tool abutment surface ( 44 ) which forms an abutment angle (α) with the tool axis (T) in the range of 0 to 45 degrees.

15. The tool coupling arrangement ( 12 ) according to claim 14 , wherein the abutment angle (α) is in the range of 0 to 20.

16. The tool coupling arrangement ( 12 ) according to claim 1 , wherein the tool portion ( 14 ), the coupling member ( 18 ) and the shank portion ( 16 ) include, respectively, a tool cooling duct ( 26 ), a member cooling duct ( 28 ) and shank cooling duct ( 30 ).

17. The tool coupling arrangement ( 12 ) according to claim 1 , wherein in the locked position, the tool coupling end ( 24 ) has a tool coupling length (LN) and a tool diameter (D) measured at a shank forward surface ( 74 ); and wherein the tool coupling end ( 24 ) has a length-diameter ratio (RT)=(LN/D)>2.

18. The tool coupling arrangement ( 12 ) according to claim 1 , wherein in the locked position, no portion of the tool coupling end ( 24 ) abuts the bore recess ( 80 ).

19. A drill or reamer having a forward-to-rear direction (F, R) and comprising a tool portion ( 14 ), a shank portion ( 16 ), and an elongated coupling member ( 18 ), wherein:
the shank portion ( 16 ) comprises:
a longitudinally extending cylindrical forward bore portion ( 76 ) comprising a radially outwardly extending bore recess ( 80 ) formed therein, and
a shank axial stopper ( 48 );

the tool portion ( 14 ) comprises a cutting end ( 22 ), a tool coupling end ( 24 ) and a tool axial stopper ( 46 );
the elongated coupling member ( 18 ) comprises axially opposite member coupling and pulling ends ( 56 , 58 );
the tool coupling end ( 24 ) is located within the forward bore portion ( 76 ) and the coupling member ( 18 ) is located further rearward inwards in the shank portion ( 16 );
in a locked position:
the tool axial stopper ( 46 ) abuts the shank axial stopper ( 48 );
the tool coupling end ( 24 ) abuts the forward bore portion ( 76 ) at two axially separate areas on either side of the bore recess ( 80 );
no portion of the tool coupling end ( 24 ) abuts the bore recess ( 80 ); and
the member coupling end ( 56 ) of the coupling member ( 18 ) abuts both the tool coupling end ( 24 ) and the bore recess ( 80 ).

Assignees

• Iscar Ltd

Inventors

• Hecht Gil

Classifications

• B23D2277/02

  Cutting head and shank made from two different components which are releasably or non-releasably attached to each other · CPC title

• B23D77/006

  with means for lubricating or cooling · CPC title

• B23B2231/0204

  Connection of shanks to working elements of tools · CPC title

• B23D2277/06

  Connections between component parts · CPC title

• B23D77/02

  Reamers with inserted cutting edges · CPC title