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US 8,215,415 B2Granted
Chisel
AssigneesHawera Probst GmbH & Co., Aresi S.p.A.
InventorsMarco Lang, Franc Koljaka, Friedmar Dresig, Thomas Bernhardt
Life of this patent
Estimating the term…
Abstract
A tool bit for a chisel or a hammer drill, in particular, a insertable chisel or insertable drill for power-driven drill and chisel hammers, has an insertion end, with a chisel shank or drill shank, and a chisel head or drill shank located opposite the insertion end. The diameter of the shank increases in the direction of the chisel head at least once from a first, small diameter to a second, large diameter and decreases again from this to a small diameter or forms at least one bead.
Claims11
A chisel, comprising:
- a shank having opposite ends;
- one end of the shank comprising an insertion portion;
- and
- the end of the shank opposite the insertion portion comprising a head,
- wherein the head is a working end and wherein a cross sectional area of the shank increases in the direction of the head at least once from a first small cross sectional area to a large cross sectional area and then decreases to a second small cross sectional area to form a bead,
- wherein the bead dampens vibration,
- wherein the bead is part of the shank, the bead is at a position on the shank between the insertion portion and the head, and the bead is at a distance from the insertion portion,
- wherein the insertion portion, head, bead, and shank are formed out of one piece,
- wherein the bead is rotationally symmetric about a longitudinal axis and has a circular cross section perpendicular to the longitudinal axis,
- wherein the bead is arranged in that half of the shank which faces the insertion end, and
- wherein the shank is not helical.
8 more elements
Dependencies are inferred from the claim text.