Tool shank and chuck combination for a hammer drill
AssigneeRobert Bosch GmbH
InventorKarl Wanner
Life of this patent
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Abstract
A hammer drill has a chuck forming a tool receptacle defining a chuck axis and provided with a tool-holding element radially displaceable into a position protruding into the tool receptacle. The tool has a shank defining a tool axis receivable axially in the receptacle. This shank is formed with a radially outwardly open recess closed at both of its axial ends and shaped to receive the tool-holding element, and with an axially extending groove separate from the recess and open axially at a free end of the shank. At least a section of the shank has a conical shape decreasing in a direction towards the free end of the shank. The shank may be provided with at least one cylindrical guiding section located adjacent to the above conical section.
Claims10
In combination with a chuck having a tool receptacle defining a chuck axis and tool-holding element radially displaceable into a position protruding into said receptacle, a tool having a shank which defines a tool axis and has a portion receivable axially in said receptacle, and having a free end, said shank being formed with a radially outwardly open recess closed at both of its axial ends and adapted to receive said tool-holding element, and with an axially extending groove separate from said recess and open axially at said free end, at least a section of said portion of said shank having a conical shape decreasing in a direction towards said free end and said chuck has a projection engaging in said axial groove of said shank.
Dependencies are inferred from the claim text.