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US 2005/0116428 A1Published application
Tool holder for a rotary hammer
AssigneeBlack & Decker Inc.
InventorAchim Buchholz
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AssigneeBlack & Decker Inc.
InventorAchim Buchholz
Estimating the term…
A tool holder (1) for a rotary hammer which has a tube like tool holder main body (10) having a side wall formed with through holes (11) for receiving corresponding locking bodies (12) and formed with additional through holes (40). The tool holder includes hardened metal driving ribs (46) each located on an insert (42) and the inserts are fitted within the additional through holes (40) so that the ribs extends axially and radially inwardly of the radially inward facing surface of the holder body. The locking bodies (12) are arranged to releaseably engage a corresponding axial closed groove of a tool or bit inserted within the tool holder and the ribs (46) are arranged to releaseably engaging a corresponding axial rearwardly open driving grooves of a tool or bit inserted within the tool holder. To simplify the process for forming the tool holder body (10) each additional through hole (40) is formed by at least two overlapping axially offset circular cross-sectioned through holes (40a, 40b) and the corresponding insert has a base (44) shaped to fit the through hole (40).
A tool holder (1) for a rotary hammer, comprising:
A tool holder according to any one of claims to 3 wherein the or each additional through hole (40) is formed by two overlapping axially offset circular cross-sectioned through holes (40a, 40b).
A tool holder according to any one of the preceding claims wherein each circular cross-sectioned hole (40a, 40b) has a cross-section with a constant diameter from the radially outer to the radially inner surface of the holder body 10.
A tool holder according to any one of the preceding claims wherein the or each insert (42) is secured in the corresponding additional through hole (40) in the holder body 10 by press fitting, adhesion, soldering or welding.
A tool holder according to any one of the preceding claims wherein the or each rib (46) is formed on the insert (44) and the insert is made of hardened metal.
A tool holder according to any one of the preceding claims wherein the hardened metal is a carbide material
A tool holder according to any one of the preceding claims wherein the base (44) of the or each insert (42) is shaped like a number, corresponding to the number of circular cross-sectioned through holes, of overlapping solid cylinders (44a, 44b) arranged side by side with their axes parallel.
A tool holder substantially as hereinbefore described with reference to any one of the accompanying Figures.
A tube like tool holder main body (10) of a tool holder 1 suitable for a rotary hammer having a side wall formed with at least one through hole (11) suitable for receiving a corresponding locking body (12) of a tool holder and formed with at least one additional through hole (40) suitable for receiving at least one hardened metal driving rib insert (42) of a tool holder characterised in that the or each additional through hole (40) is formed by at least two overlapping axially offset circular cross-sectioned through holes (40a, 40b).
Dependencies are inferred from the claim text.