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US 5,326,199 AGranted
Tool bit and tool bit chuck for manually operated tools
AssigneeHilti Aktiengesellschaft
InventorsWerner Kleine, Reinhard Schulz
Life of this patent
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AssigneeHilti Aktiengesellschaft
InventorsWerner Kleine, Reinhard Schulz
Estimating the term…
A tool bit has an axially extending shank section (1) to be inserted into a chuck in a manually-operated tool. The tool bit has an axially extending working section extending from the shank section. In the end region of the shank section remote from the working section there are first faces (2) acting in the axial direction and second faces (3) acting in the circumferential direction. In addition, the shank section (1) has entrainment faces (4a) spaced axially from the first and second faces toward the working section. The entrainment faces (4a) are located radially outwardly from the first and second faces (2, 3). The entrainment faces (4a) are part of grooves formed by a profiled section of the shank section and the grooves are open in the axial direction toward the first and second faces. The entrainment faces (4a) are radially spaced outwardly from the outer surface of the part of the shank section containing the first and second faces, so that they are able to transmit larger torques.
Tool bit to be inserted into a chuck in a manually operated tool used for chisel-cutting and/or percussion drilling, the tool bit comprising an axially extending shank section (1) and an axially extending working section, said shank section arranged to be inserted into the chuck and having a first end inserted first into the chuck, said shank section (1) has first faces ( 2 ) acting in the axial direction, second faces (3) acting in the circumferential direction and radially extending entrainment faces (4a) spaced axially from said first and second faces, said shank section (1) has a first axially extending subsection extending from the first end and a second axially extending subsection extending coaxially with and from said first subsection and spaced from the first end, said first subsection has an outer surface with a smaller diameter than an outer surface of said second subsection, said entrainment faces (4a), are formed in the outer surface of said second subsection, said entrainment faces (4a) have a least radial dimension from the axis greater than half the diameter (d) of the first subsection.
Tool bit and a tool bit chuck for a manually operated tool used for chisel-cutting and/or percussion drilling, the tool bit comprising an axially extending shank section (1) and an axially extending working section, said shank section arranged to be inserted into the chuck and having a first end inserted first into the chuck, said shank section (1) has first faces (2) acting in the axial direction, second faces (3) acting in the circumferential direction and radially extending entrainment faces (4a) spaced axially from said first and second faces, said shank section (1) has a first axially extending subsection extending from the first end and a second axially extending subsection extending coaxially with and from said first subsection and spaced from the first end, said first subsection has an outer surface with a smaller diameter than an outer surface of said second subsection, said entrainment faces are formed in the outer surface of said second subsection, said entrainment faces (4a) have a least radial dimension from the axis greater than half the diameter (d) of the first subsection, said chuck comprising an axially extending guidance member (8), said guidance member (8) having an opening into which said tool bit can be inserted, said guidance member having a first axially extending guidance region (5) extending axially inwardly from said guidance member opening and a second axially extending guidance region extending inwardly from an end of said first guidance region remote from said guidance member opening, said second guidance region (6) comprising matching counterfaces for said first faces (2) and said second faces (3) on said shank section, said first guidance region (5) having counterfaces (7a) in cooperating engagement with said entrainment faces (4a) of the second subsection of said tool bit, with the a radial dimension (R) of said counterfaces in said first guidance region (5) from the axis (C) of the guidance member opening exceeding half the diameter (D) of said second guidance region (6).
Dependencies are inferred from the claim text.