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AssigneeRobert Bosch GmbH
InventorsSteffen Wuensch, Harald Krondorfer, Mather John Carr, Anne Tregoning Miller, Neil Pollock, Hans Kaiser, Daniel Saegesser, Daniel Grolimund
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A tool fastening mechanism has a housing 2, in which a clamping opening 3 is embodied for receiving a tapering tool shaft clamping end 4 of a tool part 5. The clamping opening 3 tapers inward in the introduction direction of the clamping end 4 of a tool part 5, and furthermore the tapering sides are inclined toward one another in a plane extending perpendicular to the introduction direction, as a result of which the opening has a trapezoidal cross section, and the length of this cross section decreases away from the orifice of the clamping opening 3. The housing 2 furthermore has a transverse opening 7, which intersects the clamping opening 3 and in which a locking pin 8 is received. Upon introduction of a tool into the fastening mechanism, a tapering edge 20 of the pin 8 comes into engagement with a front edge 21 of an oblong hole 9, embodied in the clamping edge 4 of the tool part 5, and the resultant engagement action draws the clamping end 4 deeper into the clamping opening 3, while the pin 8 is driven farther into the transverse opening 7. The combination of the double tapering of the clamping opening 3 and the longitudinal locking accomplished by the locking pin 8 makes it possible to effectively restrict all six degrees of freedom of the tool part, within the production tolerances attainable by conventional mass-production methods.
A tool fastening mechanism having a housing, which has a clamping opening for receiving a shaft of a tool to be fastened, wherein the clamping opening tapers downward in a first direction, in which in use the tool shaft is introduced into the clamping opening, and which also tapers in a second direction extending perpendicular to the first direction, having an opening in the housing which intersects the clamping opening, and having a locking pin, which is movable in the opening between a first position, in which it is retracted out of the clamping opening, so that in use it allows the tool shaft to be introduced into and removed from the clamping opening, and a second position, in which it protrudes into the clamping opening, so that in use it takes the tool shaft into engagement, in order to prevent the shaft from being pulled out of the opening, and wherein upon introduction of the tool shaft into the opening in use, the tapering of the opening in the first direction restricts a motion of the shaft in a third direction extending perpendicular to the first and second directions, which tapering of the opening in the second direction lends the shaft an engagement action and presses it against one side of the opening, in order to restrict a motion In the second direction, and engagement of the locking pin with the shaft restricts a motion in the first direction, as a result of which all six degrees of freedom of the tool shaft are restricted.
The tool fastening mechanism of one of the foregoing claims, in which the clamping opening, in the plane of its orifice, has a trapezoidal cross section, whose length decreases in the direction of introduction of the shaft into the opening.
The tool fastening mechanism of claim in which three protrusions are formed onto the tapering sides of the opening, specifically at least one on each tapering side, as a result of which in use, a contact at six points is brought about between the tool shaft and walls of the opening.
Dependencies are inferred from the claim text.