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US 9,243,674 B2Granted
Power tool braking device
AssigneeRobert Bosch GmbH
InventorFlorian Esenwein
Life of this patent
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Abstract
A power tool braking device, in particular a hand-held power tool braking device, of a portable power tool has at least one magnetic field braking unit. The power tool braking device comprises at least one mechanical activation unit.
Claims18
A power tool braking device of a portable power tool, comprising:
- at least one magnetic field braking unit including a first braking element, a second braking element and a third braking element, the first braking element being moveable with respect to the second braking element;
- and
- at least one mechanical activation unit positioned on a side of the at least one magnetic field braking unit opposite at least one drive unit of the portable power tool and including a mechanical actuation switch configured to move a lever arm in engagement with the first braking element to move the first braking element with respect to the second braking element between relative positions to selectively change a characteristic of a magnetic field generated between the first braking element and the second braking element to selectively brake the third braking element.
A portable power tool comprising:
- a drive unit;
- and
- a power tool braking device including;
- (i) at least one magnetic field braking unit including a first braking element, a second braking element and a third braking element operably coupled to the drive unit, the first braking element being moveable with respect to the second braking element;
- and (ii) at least one mechanical activation unit positioned on a side of the at least one magnetic field braking unit opposite the drive unit and including a mechanical actuation switch configured to move a lever arm in engagement with the first braking element to move the first braking element with respect to the second braking element between relative positions to selectively change a characteristic of a magnetic field generated between the first braking element and the second braking element to selectively brake the third braking element.
2 more elements
A power tool braking device of a portable power tool, comprising:
- at least one magnetic field braking unit including a first braking element, a second braking element and a third braking element, the first braking element being rotatable with respect to the second braking element;
- and
- at least one mechanical activation unit including:
- (i) a first output element rotationally coupled to the first braking element and defining an edge region;
- and (ii) a second output element rotationally coupled to the second braking element and defining a corresponding edge region configured to selectively engage the edge region of the first output element,
- wherein the first output element is configured to rotate the second output element with the edge region of the first output element in engagement with the edge region of the second output element;
- and
- wherein the first output element is further configured to rotate relative to the second output element with the edge region of the first output element out of engagement with the edge region of the second output element to rotate the first braking element relative to the second braking element between relative positions to change a characteristic of a magnetic field generated between the first braking element and the second braking element to selectively brake the third braking element.
5 more elements
Dependencies are inferred from the claim text.