Machine tool, especially a hand-held power tool with a turnable clamping element for clamping a tool on the tool spindle
First Claim
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1. In a machine tool, especially a hand-held power tool, a combination comprising a housing;
- a tool spindle mounted in the housing for rotation about its axis;
means on the tool spindle including a clamping element turnably mounted on said spindle for clamping a tool on the latter for rotation therewith;
manually operated means for turning said spindle about its axis;
arresting means movable between a rest position and an arresting position for holding said clamping element against rotation during turning of said spindle for clamping or for releasing a tool, said manually operated turning means being movable between an inactive position and an active position turning said tool spindle and means cooperating with said manually operated turning means and said arresting means for moving said turning means to said active position during movement of said arresting means to said arresting position and vice versa;
a drive motor operatively connected to said spindle;
a switch for switching said drive motor on sand off; and
connecting means connecting said switch with said manually operable turning means and said arresting means for switching said drive motor off when said turning means is moved to the active and said arresting means to said arresting position.
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Abstract
A machine tool, especially a hand-held power tool, comprises a tool spindle and a clamping element turnably mounted on the spindle, in which the turnable clamping element is arrestable during rotation of the spindle for clamping or releasing a tool mounted thereon to thereby make a separate implement for preventing rotation of the clamping element during clamping or releasing the tool on the spindle unnecessary. In a special embodiment of the present invention the clamping or releasing forces during change of the tool are mechanically applied and the turning moment during clamping of the tool is limited to a predetermined value.
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Citations
18 Claims
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1. In a machine tool, especially a hand-held power tool, a combination comprising a housing;
- a tool spindle mounted in the housing for rotation about its axis;
means on the tool spindle including a clamping element turnably mounted on said spindle for clamping a tool on the latter for rotation therewith;
manually operated means for turning said spindle about its axis;
arresting means movable between a rest position and an arresting position for holding said clamping element against rotation during turning of said spindle for clamping or for releasing a tool, said manually operated turning means being movable between an inactive position and an active position turning said tool spindle and means cooperating with said manually operated turning means and said arresting means for moving said turning means to said active position during movement of said arresting means to said arresting position and vice versa;
a drive motor operatively connected to said spindle;
a switch for switching said drive motor on sand off; and
connecting means connecting said switch with said manually operable turning means and said arresting means for switching said drive motor off when said turning means is moved to the active and said arresting means to said arresting position.
- a tool spindle mounted in the housing for rotation about its axis;
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2. In a machine tool, especially a hand-held power tool, a combination comprising a housing;
- a tool spindle mounted in the housing for rotation about its axis;
means on the tool spindle including a clamping element turnably mounted on said spindle for clamping a tool on the latter for rotation therewith;
means for turning said spindle about its axis and including a motor which is a reversible two-speed electric motor shiftable to a low speed during clamping or releasing of the tool and rotatable in one direction during clamping of the tool and in the opposite direction during release of the tool; and
arresting means movable between a rest position and an arresting position for holding said clamping element against rotation during turning of said spindle for clamping or for releasing a tool, said arresting means being formed to release said clamping element during clamping of the tool when the moment for clamping the tool on the spindle surpasses a predetermined amount, and to be turned by said motor when the latter is rotated in the opposite direction for releasing the tool without limiting the moment imparted by the motor to said arresting means.
- a tool spindle mounted in the housing for rotation about its axis;
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3. In a machine tool, especially a hand-held power tool, a combination comprising a housing;
- a tool spindle mounted in the housing for rotation about its axis and having an end portion provided with a screwthread, said tool spindle having rearwardly of said end portion a shoulder face;
means on the tool spindle including a clamping element turnably mounted on said spindle for clamping a disc-shaped tool on the latter for rotation therewith and threadedly connected with said screwthread so as to be rotatably axially shiftable with respect to said spindle for clamping the tool on the latter for rotation therewith, said clamping element being constituted by a clamping nut on said threaded end portion of said spindle and adapted to engage the tool on the side thereof facing away from said shoulder face, and including a clamping flange arranged on said spindle and adapted to engage the tool on the other side thereof;
means connecting said clamping nut and said clamping flange for rotation and axially shiftable with respect to each other, whereby during rotation of said spindle in one direction while said arresting means is in its arresting position said clamping nut will be moved towards said shoulder face and said clamping flange against the latter to clamp the tool between said clamping nut and said clamping flange;
means for turning said spindle about its axis; and
arresting means movable between a rest position and an arresting position for holding said clamping element against rotation during turning of said spindle for clamping or for releasing a tool. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
- a tool spindle mounted in the housing for rotation about its axis and having an end portion provided with a screwthread, said tool spindle having rearwardly of said end portion a shoulder face;
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17. In a machine tool, especially a hand-held power tool, a combination comprising a housing;
- a tool spindle mounted in the housing for rotation about its axis and having an end portion provided with a screwthread, said tool spindle having rearwardly of said end portion a shoulder face;
means on the tool spindle including a clamping element turnably mounted on said spindle for clamping a disc-shaped tool on the latter for rotation therewith and threadedly connected with said screwthread so as to be rotatably axially shiftable with respect to said spindle for clamping the tool on the latter for rotation therewith, said clamping element being constituted by a clamping nut on said threaded end portion of said spindle and adapted to engage the tool on the side thereof facing away from said shoulder face, and including a clamping flange arranged on said spindle and adapted to engage the tool on the other side thereof;
means for turning said spindle about its axis;
arresting means movable between a rest position and an arresting position for holding said clamping element against rotation during turning of said spindle for clamping or for releasing a tool;
slide means for holding said clamping flange and therewith said clamping nut against rotation about said spindle;
means separated from said slide means for manually turning said spindle about its axis;
a ventilator having a plurality of angularly displaced vanes and being operatively connected to said spindle for rotating the latter during rotation of said ventilator, said means for manually turning said spindle comprising a lever mounted on said housing for tilting about a pivot pin between an inactive and a driving position and having to one side of said pivot pin a handle portion and at the other side of said pivot pin a drive finger arranged and dimensioned in such a manner that during tilting of said lever from said inactive to said driving position said drive finger will engage between the vanes of said ventilator to turn the latter and therewith said spindle operatively connected to said ventilator. - View Dependent Claims (18)
- a tool spindle mounted in the housing for rotation about its axis and having an end portion provided with a screwthread, said tool spindle having rearwardly of said end portion a shoulder face;
Specification