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US 10,882,125 B2Granted
Blade size limiter
AssigneeRobert Bosch GmbH
InventorAndrew Frolov
Life of this patent
Estimating the term…
Abstract
A power tool includes a motor; an arbor attachment mechanism that includes a shaft configured to be driven by the motor about a spin axis. The arbor attachment mechanism is configured to hold a blade onto the shaft. The power tool includes a blade size limiter that is configured to prevent attachment of a blade with a radius greater than a predetermined size, and is configured to be connected to the arbor attachment mechanism independently of the attachment of the blade to the arbor attachment mechanism and such that the blade size limiter is at a distance from the spin axis of the shaft.
Claims25
A power tool comprising:
- a riving knife;
- an arbor attachment mechanism that includes a shaft that is configured to be driven to spin about a spin axis;
- and
- a blade size limiter that includes a limiting surface;
- wherein the limiting surface:
- (a) is connected or connectible to the arbor attachment mechanism so that the limiting surface is at a distance from the spin axis;
- (b) is configured to prevent a blade with a radius greater than a predetermined size to be mounted onto the shaft of the arbor attachment mechanism;
- and
- (c) faces the spin axis and is arranged such that, when a blade with a radius that is not greater than the predetermined size is mounted on the shaft, the limiting surface is positioned, with respect to a radial direction extending from the shaft, at a radial coordinate that is between a radial coordinate of a radially exterior edge of the blade and a radial coordinate of a most radially interior edge of the riving knife;
- and
- wherein:
- (1) the riving knife includes an arcuate edge that extends arcuately about the spin axis and the limiting surface of the blade size limiter extends arcuately about the spin axis;
- and/or
- (2) the power tool further comprises an arm, a first end of the arm is configured to surround the shaft, a second end of the arm is configured to be attached to the riving knife, the blade size limiter is attachable to the arm, and the limiting surface is concave and faces the shaft.
11 more elements
A riving knife assembly comprising:
- a riving knife that includes an arcuate edge that extends arcuately about an axis;
- and
- a blade size limiter that includes:
- an arcuate segment;
- and
- a mounting structure configured to be attached to the riving knife, thereby positioning the arcuate segment of the blade size limiter to extend arcuately about the axis and, with respect to a radial direction extending from the axis, at a radial coordinate that is between a radial coordinate of a radially exterior edge of the blade and a radial coordinate of a most radially interior edge of the riving knife.
3 more elements
A tool comprising:
- a blade attachment mechanism including a shaft and configured for attachment of a blade that is not greater than a predetermined size to spin about the shaft;
- a riving knife;
- a position adjusting mechanism for adjusting a position of the riving knife relative to the shaft;
- and
- a blade size limiter that is attached to the position adjusting mechanism and includes a limiting surface that:
- (a) in a radial direction, faces a central longitudinal axis of the shaft;
- and
- (b) extends parallel to the central longitudinal axis of the shaft;
- wherein a radius from the shaft to the limiting surface is shorter than a radius from the shaft to a most radially interior coordinate of the riving knife and wherein the limiting surface is configured to prevent a blade with a radius greater than the predetermined size to be mounted onto the shaft;
- and
- wherein:
- (1) the riving knife includes an arcuate edge that extends arcuately about a spin axis of the shaft and the limiting surface of the blade size limiter extends arcuately about the spin axis;
- and/or
- (2) the power tool further comprises an arm, a first end of the arm is configured to surround the shaft, a second end of the arm is configured to be attached to the riving knife, the blade size limiter is attachable to the arm, and the limiting surface is concave and faces the shaft.
11 more elements
Dependencies are inferred from the claim text.