Self-Tightening Rotary Tool Holding System
AssigneesRobert Bosch Tool Corporation, Robert Bosch GmbH
InventorsJeremy Rubens, Chris Dvorak
Life of this patent
Estimating the term…
Abstract
A tool holding system for a rotary power tool is configured to clamp around a working tool when the working tool is inserted in the tool holding system. The tool holding system includes a sleeve having a frustroconical inner surface portion, a collet having frustoconical outer surface portion complementary to the inner surface portion, a spring mount operably connected to a motor for rotation by the motor, and a spring. The spring includes a first end portion operably connected to the collet to bias the collet toward a first position whereat the outer surface portion engages the inner surface portion, and a second end portion rotationally fixed with respect to the spring mount.
Claims20
A rotary power tool comprising:
- a sleeve including a frustroconical inner surface portion;
- a collet including frustoconical outer surface portion complementary to the inner surface portion;
- a spring mount operably connected to a motor for rotation by the motor;
- and
- a spring including a first end portion operably connected to the collet to bias the collet toward a first position whereat the outer surface portion engages the inner surface portion, and a second end portion rotationally fixed with respect to the spring mount.
A tool holding system comprising:
- a first cage member including a first plurality of elongated slots, each of the first plurality of elongated slots having a first end portion which opens to a first shank receiving opening defined by the first cage member, and a second end portion which does not open to the first shank receiving opening;
- a plurality of roller members, each roller member of the plurality of roller members movably positioned in a respective one of the first plurality of elongated slots;
- and
- a roller carriage including a carriage opening aligned with the first shank receiving opening, and a plurality of generally cylindrical passages, each of the plurality of generally cylindrical passages (i) substantially parallel to the central axis, (ii) receiving a portion of a respective one of the plurality of roller members, and (iii) configured to prevent the respective roller member from moving circumferentially relative to the roller carriage while permitting the respective roller member to move radially relative to the roller carriage within a predetermined range.
The tool holding system of claim 6 wherein the roller carriage is rotationally biased such that each of the plurality of roller members is biased toward the first end portion of the respective first plurality of elongated slots.
A rotary power tool comprising:
- a first one-way clutch rotationally fixed with respect to an output shaft of a rotary power tool and defining a first shank receiving opening;
- and
- an alignment assembly including a second shank receiving opening aligned with the first shank receiving opening, the alignment assembly configured to align a shank of a working tool received within the first shank receiving opening and the second shank receiving opening, and to generate a damping force on the received shank.
A rotary power tool comprising:
- a first collar rotationally fixed with respect to an output shaft of a power tool and including a first shank receiving opening having a longitudinal axis;
- a second collar movable with respect to the output shaft and including at least one inclined outer surface;
- and
- at least one lever pivotably connected to the first collar and including a first end portion configured to engage the at least one inclined outer surface, and a cam located at a second end portion, the cam extending into the first shank receiving opening such that upon rotation of the output shaft in a first rotational direction, the at least one inclined outer surface is forced against the first end portion thereby forcing the cam toward the axis.
Dependencies are inferred from the claim text.