The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 01, 1986
Filed:
Oct. 04, 1984
John C Gall, Chicago, IL (US);
Richard D Meharg, Winfield, IL (US);
Sears, Roebuck & Co., Chicago, IL (US);
Abstract
A lift device for a sewing machine head of the type having a free arm to alternately provide flat bed, free arm and storage positions in a cabinet having a tabletop with a cutout for the sewing machine head and a pivoting lift mechanism disposed beneath the cutout. The lift device includes a base plate for the sewing machine head secured to the pivoting lift mechanism to permit movement of the sewing machine head between the flat bed, free arm and storage positions. The lift mechanism includes a pair of primary links having first ends pivotally secured to the underside of the tabletop adjacent and on opposite sides of the cutout and a pair of secondary links having first ends pivotally secured at opposite sides of the base plate remote from the points at which the primary links are secured to the tabletop with the second ends of the primary links being pivotally secured to the second ends of the secondary links. The lift device also includes structure in the form of members which engage and disengage in response to movement of the lift mechanism for supporting the sewing machine head in each of the flat bed, free arm and storage positions. By limiting relative pivotal movement between the primary links and the secondary links and between the secondary links and the base plate, the lift device is capable of shifting the center of gravity of the sewing machine head toward the pivot point during movement between the flat bed, free arm and storage positions.