Rock drill
AssigneeHawera Probst GmbH & Co.
InventorsBernhard Moser, Wolfgang Peetz
Life of this patent
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Abstract
A rock drill haivng a drill head with cruciform cutting tips is proposed which has improved chiselling properties in the case of percussive loading in hard rock or the like. For this purpose, the main cutting tip (4) is of a design know per se with secondary cutting tips (7,8) which are arranged transverse thereto and have a roof-shaped cross-section in side elevation. Additional, radially further outward bit points (16) for working the material result from the roof-shaped cross-section of the secondary cutting timps (7,8,) (cf. drawing).
Claims14
A rock drill, in particular for hammer drills or the like, having a helical shank and having at least one main cutting tip of sintered carbide, said tip extending over the entire diameter of the drill head, sloping in the shape of a roof in side elevation and having cutting edges, and said rock drill having secondary cutting tips, arranged transverse to said main cutting tip and comprising at least one piece, to form a cruciform cutting head, wherein, in side elevation, each secondary cutting tip arranged to the side of the main cutting tip is designed as a roof-shaped cutting element having a bit point enclosing an obtuse angle .beta..
Dependencies are inferred from the claim text.