Importance

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Abstract

In one embodiment of this quick change mechanism, a narrow six spline hub is installed in the arbor hole of a circular saw blade or other disc tool heads such as grinders, sanders and buffers. This hub slides onto a matching splined drive shaft in which a narrow section of spline lands has been removed circumferentially to fit the width of the splined hub that is secured to the circular saw blade. A fifteen degree rotation of this splined blade hub on this shaft aligns all the lands and grooves, thus locking the hub relative the longitudinal axis of the drive shaft. To continue the locking, by locking the hub in rotation relative to the shaft, a splined sliding collar with spline land extensions, serving as locking fingers, is interposed into the spline grooves of the drive shaft and also the hub grooves. A blind longitudinal hole in the drive shaft contains a compression spring and an unthreaded bolt. A pin inserted through: a hole in the sliding collar; a longitudinal slot in the drive shaft; and a hole in the central bolt, insures the sliding collar will move with the central bolt. The shaft slot limits the fore and aft movement of the sliding collar during locking to that axial distance required for the locking and unlocking functions. The spring keeps the sliding collar and its extensions in the forward locked position, and the head of the bolt extended out of the shaft end. Removal of the blade is done by pressing the bolt head toward the shaft, thereby clearing the locking fingers as the sliding collar is moved. Then the blade is rotated fifteen degrees to place hub spline lands into the drive shaft grooves. The blade is then ejected by spring pressure. Circular saw blade changes therefore are made in seconds without the use of tools, by utilizing this embodiment and other embodiments of this quick change mechanism.

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First Claim