Patent
Quick change mechanism for circular saw blades and other spinning disc devices
TLDR
In this paper, a 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, and a splined sliding collar with spline land extensions is interposed into the spline grooves of the drive shaft and also the hub grooves.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.read more
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Patent
Detection system for power equipment
Stephen F. Gass,Robert L. Chamberlain,Benjamin B. Schramm,Joel F. Jensen,Jonathan N. Betts-Lacroix +4 more
TL;DR: In this paper, conductive cutters adapted to cut workpieces and motors adapted to drive the cutters are disclosed, including a contact detection system adapted to detect contact between a person and the cutter.
Patent
Safety systems for power equipment
Stephen F. Gass,David A. Fanning,J. Fulmer,David S. D'Ascenzo,Jonathan N. Betts-Lacroix,Robert L. Chamberlain,Joel F. Jensen,Andrew L. Johnston,Sung Kim,Anwyl M. Mcdonald,Benjamin B. Schramm +10 more
TL;DR: In this article, a saw with a safety system is described, which includes a detection system adapted to detect contact between a person and a blade while the blade is moving and a brake system that stops the blade when the detection system detects contact between the person and the blade.
Patent
Miter saw with improved safety system
Stephen F. Gass,J. David Fulmer +1 more
TL;DR: In this paper, a miter saw is described as having a base, a blade supported by the base and a detection system adapted to detect a dangerous condition between a person and the blade, and a reaction system associated with the detection system to cause a predetermined action to take place.
Patent
Detection systems for power equipment
TL;DR: In this paper, improved methods to detect when a human body contacts a predetermined portion of a machine are disclosed, which are particularly applicable in woodworking equipment such as table saws to distinguish contact between a person and the blade of the saw from contact between the blade and wet or green wood.
Patent
Translation stop for use in power equipment
Stephen F. Gass,David A. Fanning +1 more
TL;DR: Woodworking machines are disclosed having a blade adapted to cut workpieces, and an actuating mechanism operable to move the blade toward the workpiece as discussed by the authors, and the machines also include a detection system configured to detect one or more dangerous conditions between a user and the blade.
References
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Patent
Saw blade retainer and kickback clutch assembly
TL;DR: In this article, a circular power saw blade mounting arrangement of the kickback clutch type is described, where the blade clamping washer, spring washer and blade screw are retained as a permanent subassembly to eliminate the possibility of substituting an incorrect part.
PatentDOI
Record disc, turntable and method for fixing same
TL;DR: In this article, a record disc has a central opening with a pair of arms forming an interlock and two detents formed integrally on a raised lip extending outwardly from the lower surface of the record disc and surrounding the opening.