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US 8,262,098 B2Granted
Rotary tool system with centering member
AssigneeRobert Bosch GmbH
InventorVerica Maras
Life of this patent
Estimating the term…
Abstract
A rotary tool includes a collet which in one embodiment includes a bit holder defining a shank receiving bore, a transfer member for transferring rotational force from the bit holder to the shank of an accessory, and a centering member positioned within the bit holder and configured to automatically grip the shank when the shank is positioned within the shank receiving bore.
Claims19
A collet for use with a rotary tool comprising:
- a bit holder defining a shank receiving bore;
- a passage opening to the shank receiving bore at a first end portion and opening to an outer wall of the bit holder at a second end portion, the passage including a first upper bearing portion and a first lower bearing portion;
- a transfer member movable within the passage between a first position whereat the transfer member is in contact with the first upper bearing portion but not the first lower bearing portion and a second position whereat the transfer member is in contact with the first lower bearing portion but not the first upper bearing portion;
- and
- a sleeve movable between an upper position whereat the transfer member is forced at least partially into a cavity of a shank when the shank is in the shank receiving bore and a lower position whereat the transfer member is free to move out of the cavity when the shank is in the shank receiving bore,
- wherein the passage and the transfer member are configured such that when the bit holder is rotated in a first direction and the transfer member is in the second position, rotational force is transferred to the shank through the transfer member, and when the bit holder is rotated in the first direction and the transfer member is in the first position, rotational force is transferred to the shank through the transfer member and an axial force is placed on the shank biasing the shank in a direction downwardly into the shank receiving bore.
3 more elements
A rotary tool kit comprising:
- a rotary tool;
- an accessory with a shank, a cavity formed in the shank;
- a bit holder defining a shank receiving bore;
- a passage opening to the shank receiving bore at a first end portion and opening to an outer wall of the bit holder at a second end portion, the passage including a forward upper bearing portion and a forward lower bearing portion;
- a transfer member movable within the passage between a first forward position wherein the transfer member is in contact with the forward upper bearing portion but not the forward lower bearing portion and a second forward position wherein the transfer member is in contact with the forward lower bearing portion but not the forward upper bearing portion;
- and
- a sleeve movable between an upper position whereat the transfer member is forced at least partially into the cavity when the shank is in the shank receiving bore and a lower position whereat the transfer member is free to move out of the cavity when the shank is in the shank receiving bore, wherein the passage, the transfer member, and the cavity are configured such that when the bit holder is rotated in a forward direction and the transfer member is in the first forward position, forward rotational force is transferred to the shank through the transfer member, and when the bit holder is rotated in the first forward direction and the transfer member is in the second forward position, forward rotational force is transferred to the shank through the transfer member and an axial force is placed on the shank biasing the shank in a direction further into the shank receiving bore.
4 more elements
Dependencies are inferred from the claim text.