Black Decker Inc.

Dean R Edwards

Stuart E Garber

John R Curtsinger

Stephen C Dassoulas

Stefan Nock

Steve McClaskey

Laura Lindberg, Legal Representative

A fastening tool and method of operating a fastening tool can include a driver, a motor, a flywheel driven by the motor, an actuator, and a controller. The actuator can cause the driver to engage with the flywheel to cause the driver to move along an axis. The controller can selectively operate the motor and selectively operate the actuator. In a first state, the controller will not operate the actuator unless the contact trip switch and the trigger switch are both actuated, the contact trip switch being actuated prior to actuation of the trigger switch, and the flywheel is rotating at a first predetermined speed. When the controller is in the first state, the controller can operate the motor to rotate the flywheel at a second predetermined speed until the earlier of a second predetermined period of time after operation of the actuator, or a subsequent operation of the actuator.

Fastening tool having timed ready to fire mode

An improved circular saw blade designed for cutting fiber cement workpieces, which are becoming more and more prevalent on the construction site, includes a PCD/carbide tip () mounted in the rim () of the saw blade () at six, rather than the usual for locations, equally spaced around the blade. The tips are mounted adjacent a relatively large-diameter, semi-circular gullet (), which itself is preceded by a chip and dust minimizer (). The minimizer includes several alternating hills () and valleys () formed in the rim of the saw blade, each hill and valley having the same radius, producing a sinuous array essentially centered on the rim of the blade. It has been discovered that such a dust and chip minimizer reduces the level of dust and chips produced by the blade and clears the same from the kerf generated in the blade-workpiece interface. Ideally, all of the parameters and relief angles for the surfaces on the saw blade tip can be generated by cutting an array of such tips from a large-diameter blank () of PCD fused to a layer of tungsten carbide (), and by mounting the tips onto the blade in such an orientation as to present, preferably, a negative hook or rake angle () to the workpiece.

Saw blade for cutting fiber cement

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Bel Air, MD, United States of America

Dean R Edwards