Sewing machine cabinet with power lift
AssigneeRoberts Mfg., Inc.
InventorKent S. Roberts
Life of this patent
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Abstract
A sewing machine cabinet has a power lift operable by a rack and pinion type of mechanism whose pinion is driven by a reversible electric motor which preferably has incorporated therein braking means and speed reduction gearing. The rack is provided by one of a pair of guide columns, which is preferably indented along its length in sprocket formation. The pinion is preferably a sprocket wheel meshing with the sprocket indentations.
Claims7
In a sewing machine cabinet having a work table elongately apertured, an elongate sewing-machine-receiving platform accommodated by the aperture of the work table, and a power lift assembly for lowering and raising the platform from and back into the aperture, the improvement wherein the power lift assembly comprises a pair of guide columns, but only a pair, secured to the cabinet at and mutually spaced along one of the elongate sides of the platform intermediate the length thereof, one of said guide columns, but only one, being provided with a rack formation along its height, said power lift assembly further comprising a carriage mounting the platform, a pinion rotatably mounted on said carriage below the platform in operative engagement with the said rack formation of said one guide column for walking up and down the rack formation thereof when rotated in opposite directions, respectively;
- reversible power means mounted in said carriage for rotating said pinion;
- means for holding the carriage in selected positions along its path of travel;
- and means for controlling operation of said power means, said rack formation and said pinion being the sole power lift associated with the said pair of guide columns.
Dependencies are inferred from the claim text.