Tool adaptor having an insert receiving pocket and a fastening bore, and cutting tool assembly
A tool adaptor has a front retaining portion and a rear mounting portion, the front retaining portion having a base jaw, a clamping jaw, and an insert receiving pocket located therebetween, and the rear mounting portion having a rear mounting surface and a first fastening bore. A primary slot separates the base jaw from the clamping jaw and communicates with the insert receiving pocket, and a secondary slot transverse to the primary slot separates the clamping jaw from the rear mounting portion. The first fastening bore has a first bore axis which intersects the rear mounting surface and the secondary slot. A cutting tool assembly includes a tool shank, and the tool adaptor secured to a front mounting portion of the tool shank by means of a first fastening screw occupying the first fastening bore and a first shank bore of the front mounting portion.
1. A tool adaptor ( 20 ) having an adaptor axis (AA) defining an adaptor forward-to-rear direction (DF, DR), and comprising:
a front retaining portion ( 22 ) having a base jaw ( 26 ), a clamping jaw ( 28 ), and an insert receiving pocket ( 30 ) located therebetween, the insert receiving pocket ( 30 ) having a lower support surface ( 32 ) and an opposing upper clamping surface ( 34 ), the lower support surface ( 32 ) defining a first plane (P 1 ), and
a rear mounting portion ( 24 ) located axially rearward of the front retaining portion ( 22 ), the rear mounting portion ( 24 ) having an axially rearward facing rear mounting surface ( 50 ) and a first fastening bore ( 54 ),
wherein:
a primary slot ( 42 ) separates the base jaw ( 26 ) from the clamping jaw ( 28 ) and merges with the insert receiving pocket ( 30 );
a secondary slot ( 52 ) transverse to the primary slot ( 42 ) and axially spaced apart from the inset pocket ( 30 ) in the rearward direction, separates the clamping jaw ( 28 ) from the rear mounting portion ( 24 ); and
the first fastening bore ( 54 ) has a first bore axis (A 1 ) which intersects the rear mounting surface ( 50 ) and the secondary slot ( 52 ).
2. The tool adaptor ( 20 ) according to claim 1 , wherein the first bore axis (A 1 ) intersects the clamping jaw ( 28 ).
3. The tool adaptor ( 20 ) according to claim 1 , wherein the clamping jaw ( 28 ) is resiliently displaceable relative to the base jaw ( 26 ) and the rear mounting portion ( 24 ).
4. The tool adaptor ( 20 ) according to claim 1 , wherein:
the first fastening bore ( 54 ) is a through bore, and
the first fastening bore ( 54 ) extends through the rear mounting portion ( 24 ) and the clamping jaw ( 28 ).
5. The tool adaptor ( 20 ) according to claim 4 , wherein:
the first fastening bore ( 54 ) includes a first front bore portion ( 54 a ) having a first front diameter (FD 1 ) and a first rear bore portion ( 54 b ) having a first rear diameter (RD 1 ),
the first rear bore portion ( 54 b ) is entirely located in the rear mounting portion ( 24 ),
the first front bore portion ( 54 a ) is located axially forward of the first rear bore portion ( 54 b ), and
the first front diameter (FD 1 ) is greater than the first rear diameter (RD 1 ).
6. The tool adaptor ( 20 ) according to claim 1 , wherein:
the lower support surface ( 32 ) is formed on the base jaw ( 26 ), and
the upper clamping surface ( 34 ) is formed on the clamping jaw ( 28 ).
7. The tool adaptor ( 20 ) according to claim 6 , wherein the lower support surface ( 32 ) and the upper clamping surface ( 34 ) extend along a pocket axis (AP) transverse to the adaptor axis (AA).
8. The tool adaptor ( 20 ) according to claim 6 , wherein:
the insert receiving pocket ( 30 ) has a stopper surface ( 36 ) formed on the base jaw ( 26 ), and
the stopper surface ( 36 ) is transverse to the lower support surface ( 32 ).
9. The tool adaptor ( 20 ) according to claim 1 , wherein the secondary slot ( 52 ) merges with the primary slot ( 42 ).
10. The tool adaptor ( 20 ) according to claim 1 , wherein:
the secondary slot ( 52 ) comprises a major secondary slot portion ( 52 a ) and a minor secondary slot portion ( 52 b ), and
the minor secondary slot portion ( 52 b ) is inclined with respect to the major secondary slot portion ( 52 a ).
11. The tool adaptor ( 20 ) according to claim 10 , wherein:
a fourth plane (P 4 ) perpendicular to the first plane (P 1 ) bisects the major secondary slot portion ( 52 a ).
12. The tool adaptor ( 20 ) according to claim 1 , wherein:
the base jaw ( 26 ) and the clamping jaw ( 28 ) mutually merge with a clamping pivot portion ( 44 ) adjacent a terminal end portion ( 46 ) of the primary slot ( 42 ).
13. The tool adaptor ( 20 ) according to claim 12 , wherein in a cross-section taken in a second plane (P 2 ) perpendicular to the adaptor axis (AA) and passing through the insert receiving pocket ( 30 ), the terminal end portion ( 46 ) of the primary slot ( 42 ) is distally located from the insert receiving pocket ( 30 ).
14. The tool adaptor ( 20 ) according to claim 12 , wherein the clamping pivot portion ( 44 ) has a resilient axis of rotation (AR) extending along the adaptor forward-to-rear direction (DF, DR).
15. The tool adaptor ( 20 ) according to claim 14 , wherein the resilient axis of rotation (AR) intersects the secondary slot ( 52 ).
16. The tool adaptor ( 20 ) according to claim 1 , wherein:
a slot plane (PS) passes through at least a portion of the primary slot ( 42 ), in-between the base jaw ( 26 ) and the clamping jaw ( 28 ), and
in a cross-section taken in a third plane (P 3 ) parallel to the slot plane (PS) and intersecting the clamping jaw ( 28 ), the rear mounting portion ( 24 ) and the clamping jaw ( 28 ) are entirely spaced apart by the secondary slot ( 52 ).
17. A tool adaptor ( 20 ) having an adaptor axis (AA) defining an adaptor forward-to-rear direction (DF, DR), and comprising:
a front retaining portion ( 22 ) having a base jaw ( 26 ), a clamping jaw ( 28 ), and an insert receiving pocket ( 30 ) located therebetween, the insert receiving pocket ( 30 ) having a lower support surface ( 32 ) and an opposing upper clamping surface ( 34 ), the lower support surface ( 32 ) defining a first plane (P 1 ), and
a rear mounting portion ( 24 ) located axially rearward of the front retaining portion ( 22 ), the rear mounting portion ( 24 ) having an axially rearward facing rear mounting surface ( 50 ) and a first fastening bore ( 54 ),
wherein:
the front retaining portion ( 22 ) includes a clamping bore ( 58 ) extending along a clamping axis (AC);
a primary slot ( 42 ) separates the base jaw ( 26 ) from the clamping jaw ( 28 ) and merges with the insert receiving pocket ( 30 );
the clamping bore ( 58 ) has first and second clamping bore portions ( 58 a , 58 b ) spaced apart by the primary slot ( 42 );
a secondary slot ( 52 ) transverse to the primary slot ( 42 ) separates the clamping jaw ( 28 ) from the rear mounting portion ( 24 ); and
the first fastening bore ( 54 ) has a first bore axis (A 1 ) which intersects the rear mounting surface ( 50 ) and the secondary slot ( 52 ).
18. The tool adaptor ( 20 ) according to claim 17 , wherein:
the first clamping bore portion ( 58 a ) is a through bore, and
the second clamping bore portion ( 58 b ) is a threaded bore.
19. The tool adaptor ( 20 ) according to claim 17 , wherein:
a fifth plane (P 5 ) perpendicular to the first plane (P 1 ) contains the first bore axis (A 1 ), and
the clamping bore ( 58 ) and the insert receiving pocket ( 30 ) are located on the same side of the fifth plane (P 5 ).
20. The tool adaptor ( 20 ) according to claim 17 , wherein in a front view of the tool adaptor ( 20 ):
an axial projection of the clamping axis (AC) intersects the insert receiving pocket ( 30 ).
21. A cutting tool assembly ( 74 ) comprising:
a tool shank ( 76 ) longitudinally extending along a shank axis (AS) and comprising:
a front mounting portion ( 78 ) having a front mounting surface ( 80 ) and a first shank bore ( 82 ) intersecting the front mounting surface ( 80 ); and
a tool adaptor ( 20 ) removably secured to the tool shank's front mounting portion ( 78 ), the tool adaptor ( 20 ) having an adaptor axis (AA) defining an adaptor forward-to-rear direction (DF, DR), and comprising:
a front retaining portion ( 22 ) having a base jaw ( 26 ), a clamping jaw ( 28 ), and an insert receiving pocket ( 30 ) located therebetween, the insert receiving pocket ( 30 ) having a lower support surface ( 32 ) and an opposing upper clamping surface ( 34 ), the lower support surface ( 32 ) defining a first plane (P 1 ), and
a rear mounting portion ( 24 ) located axially rearward of the front retaining portion ( 22 ), the rear mounting portion ( 24 ) having an axially rearward facing rear mounting surface ( 50 ) and a first fastening bore ( 54 ),
wherein:
a primary slot ( 42 ) separates the base jaw ( 26 ) from the clamping jaw ( 28 ) and merges with the insert receiving pocket ( 30 );
a secondary slot ( 52 ) transverse to the primary slot ( 42 ) separates the clamping jaw ( 28 ) from the rear mounting portion ( 24 ); and
the first fastening bore ( 54 ) has a first bore axis (A 1 ) which intersects the rear mounting surface ( 50 ) and the secondary slot ( 52 );
and wherein:
the tool adaptor's rear mounting surface ( 50 ) interfaces the shank's front mounting surface ( 80 ), and
a first fastening screw ( 84 ) occupies the adaptor's first fastening bore ( 54 ) and the shank's first shank bore ( 82 ) to secure the tool adaptor ( 20 ) to the tool shank ( 76 ).
22. The cutting tool assembly ( 74 ) in accordance with claim 21 , wherein:
a cutting insert ( 88 ) is removably retained in the insert receiving pocket ( 30 ),
the cutting insert ( 88 ) has one operative cutting edge ( 90 ), and
a sixth plane (P 6 ) perpendicular to the adaptor axis (AA) bisects the operative cutting edge ( 90 ).
23. The cutting tool assembly ( 74 ) in accordance with claim 21 , wherein:
the adaptor's front retaining portion ( 22 ) includes a clamping bore ( 58 ),
the clamping bore ( 58 ) has first and second clamping bore portions ( 58 a , 58 b ) spaced apart by the primary slot ( 42 ),
a clamping screw ( 104 ) occupies the first and second clamping bore portions ( 58 a , 58 b ), and
rotational tightening or loosening of the clamping screw ( 104 ) results in resilient displacement of the clamping jaw ( 28 ) relative to the base jaw ( 26 ).