Patent ID: 11964352
Assignee: ROBERT BOSCH GMBH
Field: Machine tools (Mechanical engineering)
Classification: CPC B  F | IPC B  F

Claim 7:
8. An apparatus comprising:
a driving shaft;
a motor to drive the driving shaft; and
an accessory drivable by the driving shaft, the accessory including
an attachment member including (a) an inner region including a surface having (i) a first protruding structure that protrudes outward from the surface on a first side of the attachment member in a first direction and defines a locking slot that is offset from a central axis of the attachment member and (ii) a second protruding structure that protrudes outward from the surface and defines a guide slot, the central axis being perpendicular to the surface of the attachment member and (b) an outer region including the surface that extends from the inner region to an edge of the attachment member;
an attachment configured to engage with a work piece, the attachment being detachably attachable to a second side of the attachment member;
a fastener;
a locking member movable into at least (a) a locked position in which the locking member is engaged with the locking slot of the attachment member such that the attachment member is configured to rotate about the central axis, and (b) an unlocked position in which the locking member is disengaged from the locking slot of the attachment member such that the attachment member is configured to rotate about an eccentric axis, the eccentric axis being offset from the central axis; and
an eccentric member having a first side surface and a second side surface, the eccentric member including (a) a first slot that is defined as a through-hole from the first side surface to the second side surface, the first slot being structured to receive the locking member at least along a first axis that is central to the first slot, (b) a second slot that receives the driving shaft at least along a second axis that is central to the second slot, and (c) a third slot that is defined from the first side surface to the second side surface, the third slot being structured to receive the fastener at least along a third axis that is central to the third slot, the third slot being positioned such that a distance between the third axis and the first axis is greater than another distance between the second axis and the first axis,
wherein
the fastener extends through the guide slot of the attachment member and the third slot of the eccentric member to provide a secure connection between the attachment member and the eccentric member along the eccentric axis,
the central axis of the attachment member is configured to align with a drive axis of the driving shaft when the locking member is in the locked position, and
the attachment member includes a plurality of ribs on the surface of the attachment member, the plurality of ribs including (a) an inner rib that extends around the inner region of the attachment member, (b) an outer rib that extends around the edge of the attachment member, and (c) a radial rib that extends from the inner rib to the outer rib.