Cutting by use of rotating axially moving tool – Tool or tool with support – Including detailed shank
Patent
1998-06-17
2000-05-09
Bishop, Steven C.
Cutting by use of rotating axially moving tool
Tool or tool with support
Including detailed shank
279 231, 279 76, 279 78, 279 80, 279906, 279907, 408239R, B23B 31103
Patent
active
060594934
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a hand-held machine tool, particularly for drilling, screwing, brushing, grinding or the like, having a tool holder that has a receptacle into which a shaft portion of a tool is axially inserted and that is provided with guide means for guiding the tool axially, with means for rotationally slaving the tool and with retaining means for axially securing the tool. The invention also relates a tool for the hand-held machine tool, especially for drilling, screwing, brushing, grinding or the like, which is driven rotationally about its longitudinal axis and has a tool shaft including the shaft portion for axially guiding the tool, a region for rotary slaving of the tool and a retaining portion for axially fixing the tool.
2. Prior Art
A hand-held machine tool is already known (German Patent DE 25 51 125 C2), which has a tool holder for receiving a tool. The rotary slaving of the tool is effected via rotary slaving cleats on the tool holder, which engage corresponding rotary slaving grooves in the tool shaft. The tool is secured in the axial direction by releasable locking bodies of the tool holder, which engage corresponding recesses in the tool shaft that are closed on both ends axially. The means for the rotary slaving of the tool and the means for the axial fixation of the tool are disposed axially in the region of the receiving opening. This does have the advantage that an axially relatively short tool holder and a correspondingly short tool shaft can be achieved. However, because of the axial superposition of the individual functional regions, a compromise must be made in the properties of the tool shaft, for production reasons. The demand for a sturdy, wear-resistant rotary slaving region which must therefore be hardened stands in the way of making a guide region with close tolerances and thus with very great dimensional precision, so that good concentricity properties can be achieved.
Jaw liners for retaining a tool are also known. To achieve good concentricity properties, the lined jaws must receive the tool centrally to the drilling spindle at all times, regardless of the shaft diameter of the tool, which entails major production effort and expense. Inserting the tool into a drilling chuck also proves to be relatively complicated, since the drilling chuck must first be opened and then the lined jaw must be clamped together with the tool. Automatic insertion locking is not possible.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide an improved hand-held machine tool, particularly for drilling, screwing, brushing, grinding or the like, of the above-described kind and an improved tool of the above-described kind, which does not have the above-described disadvantages.
According to the invention a hand-held machine tool is provided having a tool holder with a receptacle into which a tool shaft of a tool is axially insertable. The tool holder has a longitudinal axis and comprises guide means for axially guiding the tool; means for rotary slaving the tool; retaining means for axially securing the tool, which is located in front of the guide means in an insertion direction of the tool in the tool holder, wherein the retaining means is provided with an opening for passage therethrough of the tool and comprises a clamping part having an open position arranged approximately perpendicular to the longitudinal axis, which is pivotable out of the open position in a direction toward the longitudinal axis to reduce an effective cross-section of the opening and into a clamping position in which the clamping part and the tool are clamped together, and a locking member for locking the clamping part in the open position for insertion or removal of the tool.
According to the invention the tool for the hand-held machine tool has a longitudinal axis and comprises a tool shaft. The tool shaft includes a guiding shaft portion for axially guiding the tool, a rotary slaving region for rotary slaving the tool and a retainin
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Dehde Joerg
Dreher Ernst
Garatwa Karl
Hahn Gerd
Hermes Christian
Bishop Steven C.
Robert & Bosch GmbH
Striker Michael J.
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