Cutting by use of rotating axially moving tool – Tool or tool with support – Including detailed shank
Patent
1996-12-02
2000-07-18
Bishop, Steven C.
Cutting by use of rotating axially moving tool
Tool or tool with support
Including detailed shank
279 194, 279 195, 279 75, B23B 5100, B23B 3122
Patent
active
060897988
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention proceeds from a device on hand-held tool-driving machines for coupling pounding and/or drilling tools as well as from a tool and tool holder used with that device.
Such a device is known from EP-433 876 A1 for a tool shank. Drilling tools are designed to rotate clockwise. They are driven by the tool holder of hand-held tool-driving machines accordingly so as to rotate in a right-handed manner, i.e., in the clockwise direction. Since FIG. 5 of EP 0 433 876 A1 shows a cross section (per II--II from FIG. 1) towards the shank end, the drive direction of rotation in that case is counter-clockwise. Thus in that case the narrower of the two coupling grooves that are opposite one another is positioned in front of the locking depression in the direction of rotation. These configurations of couplings, however, bring about a non-uniform torque loading on the tool shank and on the tool holder, since first of all the axial locking feature does not transmit any significant torques and since secondly the following wider coupling has a coupling flank that is located on the side of this coupling that faces away from the axial locking feature. The three coupling flanks in that case lie within a circumferential range of less than 180.degree.0.
SUMMARY OF THE INVENTION
The invention's configuration of couplings according to the characterizing feature of the invention has the advantage that torque loading is significantly more uniform over the circumference of the tool shank and the tool holder, since the torque-transmitting flank of the coupling positioned in front of the axial locking feature has now been moved substantially closer to the less loaded axial locking feature. Another advantage can be considered the fact that the more uniform torque loading also improves centering in the holder, counteracts one-sided wear, and reduces tool endangerment from shank breakage between the couplings.
As a result of the further measures, advantageous developments and improvements of the characteristics given in the main claims are obtained. For example, it is advantageous for long tool-shank life if the coupling that is at least partially opposite the axial locking feature corresponds in cross section approximately to that of the narrower of the two couplings that are opposite one another. However, in order to increase the wear allowance, particularly for the coupling gibs of the tool holder, it is advantageous if the coupling opposite the axial locking feature corresponds approximately to the cross section of the wider of the two couplings that are opposite one another. In this case wear can also be influenced by the use of appropriate materials for tool and tool holder.
A particular development of the device according to the invention consists in the fact that the tool shank of the tool designed in accordance with the invention is also designed to be compatible with known work holders in which the coupling and the axial locking feature are formed by two diametrically opposite, cylindrical locking bodies (e.g. Hilti drilling hammer TE10). For this purpose it is provided that the coupling groove on the tool shank that is at least partially opposite the axially closed locking depression be combined with an additional locking depression so that, on the one hand, when such a tool shank is inserted into a tool holder according to the invention the middle coupling groove receives a coupling gib of the tool holder, whereas, on the other hand, when the tool shank is inserted in the aforementioned known tool holder the second locking body engages with a locking effect in the second additional locking depression that is only partially closed on the axial ends.
BRIEF DESCRIPTION OF THE DRAWINGS
Three embodiments of the invention are shown in the drawing and explained in greater detail in the following description.
FIG. 1 shows a cross section through a device according to the invention for torque transmission on a drilling hammer, having a tool holder and a shank inserted in it.
FIG. 2 shows a lon
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Neubert Heinz
Wierspecker Horst
Bishop Steven C.
Robert & Bosch GmbH
Striker Michael J.
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