Walking beam scroll saw
AssigneeEmerson Electric Co.
InventorsCurtis J. Eccardt, Richard B. Brundage
Life of this patent
Estimating the term…
Abstract
A scroll or jigsaw of the walking beam type is disclosed in which the upper and lower beams or arms are of hollow, tubular construction so as to have sufficient rigidity to resist up and down vibrational movement, and so as to permit lateral cutting. The beams are mounted in a pair of identical die cast frame members, and the drive motor is mounted directly to the rear of the frame members. The motor is connected to the rear ends of the beams for reciprocably driving them. The frame members, together with the motor, are pivotally mounted relative to a base or table frame thereby to permit angling of the saw blade (as opposed to tilting the table) for bevel cuts.
Claims9
A walking beam scroll saw having a base, a frame carried by said base, said frame having a generally vertically extending rear portion, a top frame portion cantilevered forwardly from said rear portion, and a bottom frame portion cantilevered forwardly from said rear portion with said top and bottom frame portions being spaced apart vertically from one another, an induction electric motor secured directly to said rear frame portion, said motor having a drive shaft extending inwardly of said frame, an upper beam pivotally mounted with respect to said upper frame portion intermediate the ends of said upper beam, a lower beam pivotally mounted with respect to said bottom frame portion intermediate the ends of said lower beam, a blade extending between the outer ends of said upper and lower beams, means interposed between said upper and lower beams adjacent the other ends thereof for placing said blade under tension, eccentric linkage means interconnecting said motor shaft and one of said beams at the portion of said one beam proximate said tension means for reciprocably, pivotally moving said one beam up and down with respect to said frame and, via said blade and said tensioning means, effecting up and down movement of said other beam, each of said beams being of hollow, circular, tubular construction so as to minimize the mass of said beams and to minimize vibrations, and yet so as to maximize the stiffness of the beams in both vertical and lateral direction, said saw further comprising means for positively holding said blade on the outer end of each of said beams, said blade holding means comprising a one-piece member having a slot therein for receiving one end of said blade, means for securing said blade with respect to said blade holding member, the latter having a pair of supports on opposite sides thereof, said supports being pivotally, rockably supported in a portion of said beam for rocking in a substantially fore and aft direction as said beams are reciprocated upwardly and downwardly.
Dependencies are inferred from the claim text.