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US 5,848,861 AGranted
Tool-bit holder and method of manufacturing same
OwnerNiels J.o slashed.rgen Hanseninventor
Life of this patent
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Abstract
A tool-bit holder (1) for tool bits (3, 5) of cemented carbide or other hard material, in which the tool-bit holder has vibration-damping properties and the bits are specifically oriented. In particular, the tool-bit holder (1) in all essentials consists of a material, e.g. mild steel, with vibration-damping properties. The effect achieved is that the tool-bit holder may be made in one piece. The vibration-damping properties makes it possible to place the bits (3, 5) in a manner which would otherwise cause instability and consequent machining marks on the workpiece.
Claims5
An elongated tool-bit holder comprising:
- a rear end which is adapted to be secured to a part of a drilling tool;
- a front end adapted to be moved by the drilling tool in a direction of rotation about a drilling axis and in a direction of advance to drill a hole;
- a first tool bit having a first cutting edge and a second tool bit having a second cutting edge, said first and second tool bits being made of a hard material, said first and second cutting edges being of flat V-shape with a point, and said first and second tool bits being secured to said front end such that
- a) said first and second cutting edges face a direction of advance of said front end into a hole being drilled,
- b) said first cutting edge extends in a diametral plane from a position close to the drilling axis to a position spaced from a periphery of the hole being drilled,
- c) said second cutting edge extends from a position spaced from the drilling axis to the periphery of the hole being drilled,
- d) the points of said first and second V-shaped cutting edges face forward relative to the direction of advance,
- e) said second cutting edge is situated forward of said first cutting edge relative to the direction of advance, and
- f) said second cutting edge is situated in front of a symmetrical position with respect to said first cutting edge relative to the direction of rotation.
6 more elements
Dependencies are inferred from the claim text.