Drill, particulary drilling screw
First Claim
1. Drill with a drilling shank (1), particularly with a screw shank (19, 40) comprising a self-tapping thread (18), and with a fork-shaped hard-material drilling tip (10, 26, 32, 39, 41, 53) disposed opposite the driving end (2) of the shank (1, 19, 40), said drilling tip (10, 26, 32, 39, 41, 53) being inserted into a holder in the shank (1, 19, 40), said holder comprising two grooves (3, 4;
- 45,
46), disposed diametrically with respect to each other in the shank (1, 19,
40), for accommodating prongs (13, 14;
27, 28;
42, 43;
49,
50) of the drilling tip (10, 26, 32, 39, 41,
53), the width of said drilling tip (10, 26, 32, 39, 41,
53) corresponding to the diameter of the drilling shank (1), characterized in that the shank (1, 19,
40) terminates bluntly in an essentially radially flat end surface (5) from which the grooves (3, 4;
45,
46) extend towards the driving end (2) in such a manner that exclusively the two prongs (13, 14;
27, 28;
42, 43;
49,
50) of the drilling tip (10, 26, 32, 39, 41,
53), pressed axially into the grooves (3, 4;
45,
46) and snugly seated therein, hold the drilling tip (10, 26, 32, 39, 41,
53) self-lockingly on the shank (1, 19,
40), the torque being transmitted from the shank (1, 19,
40) via the walls of the grooves (3, 4;
45,
46) to the two prongs (13, 14;
27, 28;
42, 43;
49,
50).
2 Assignments
0 Petitions
Accused Products
Abstract
The invention relates to a drill with a drilling shank, particularly with a screw shank comprising a self-tapping thread, and with a fork-shaped hard-material plate-shaped drilling tip disposed opposite the driving end of the shank, said drilling tip being inserted into a holder in the shank, said holder comprising two grooves, disposed diametrically with respect to each other in the shank, for accommodating prongs of the drilling tip. The shank terminates bluntly in an essentially radial end surface from which the grooves extend towards the driving end in such a manner that exclusively the prongs of the drilling tip, pressed axially into the grooves, both hold the drilling tip self-lockingly on the shank and also transmit the torque from the shank to the drilling tip.
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Citations
15 Claims
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1. Drill with a drilling shank (1), particularly with a screw shank (19, 40) comprising a self-tapping thread (18), and with a fork-shaped hard-material drilling tip (10, 26, 32, 39, 41, 53) disposed opposite the driving end (2) of the shank (1, 19, 40), said drilling tip (10, 26, 32, 39, 41, 53) being inserted into a holder in the shank (1, 19, 40), said holder comprising two grooves (3, 4;
- 45,
46), disposed diametrically with respect to each other in the shank (1, 19,
40), for accommodating prongs (13, 14;
27, 28;
42, 43;
49,
50) of the drilling tip (10, 26, 32, 39, 41,
53), the width of said drilling tip (10, 26, 32, 39, 41,
53) corresponding to the diameter of the drilling shank (1), characterized in that the shank (1, 19,
40) terminates bluntly in an essentially radially flat end surface (5) from which the grooves (3, 4;
45,
46) extend towards the driving end (2) in such a manner that exclusively the two prongs (13, 14;
27, 28;
42, 43;
49,
50) of the drilling tip (10, 26, 32, 39, 41,
53), pressed axially into the grooves (3, 4;
45,
46) and snugly seated therein, hold the drilling tip (10, 26, 32, 39, 41,
53) self-lockingly on the shank (1, 19,
40), the torque being transmitted from the shank (1, 19,
40) via the walls of the grooves (3, 4;
45,
46) to the two prongs (13, 14;
27, 28;
42, 43;
49,
50). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
- 45,
Specification