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US 4,450,774 AGranted
Drafting and drawing table
OwnerJohnny L. Weaverinventor
Life of this patent
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OwnerJohnny L. Weaverinventor
Estimating the term…
A circularly configured rotatable element rotationally mounted for use in a drafting, drawing, tracing or light tabletops of generally rectangular or square configuration, a concave-convex annular interface disposed between the circular element and the adjacent portion of the tabletop and a series of 360.degree. sockets or apertures arranged along the interface for receiving a locking spring pin element therein. Also, indicia displaying 360.degree. markings may be disposed about peripheral portions of the circular element. A swivel assembly such as used in a lazy susan is used to support the rotatable element. In one embodiment, the circular element is constructed of transparent, translucent or similar material with a set of at least a pair of fluorescent lights mounted thereunder. In another embodiment, the rotatable element is in the form of an opaque, light impervious circular element.
A drafting table assembly comprising a tabletop having a generally planar work surface and having an enlarged circular opening therein, a flat circular disc disposed in said opening in coplanar relation to the tabletop, the circular disc and the tabletop having convex-concave interfacing elements therebetween, a retractable pin within the tabletop for engaging with one of a series of equally spaced pin receiving holes disposed along the interfacing element of the circular disc, an actuating rod extending from one edge of the tabletop for controlling engagement of the pin with said holes, the actuating rod being disposed at an angle to the pin on one side of a plane containing the longitudinal axis of the pin, first linkage means connected between an inner end of the rod and an outer end of the pin, an anchoring means disposed in the tabletop on the opposite side of said plane, and second linkage means connected between the anchoring means and the outer end of the pin, the first and second linkage means effecting withdrawal of the pin from one of said holes responsive to outward movement of the actuating rod in relation to said edge of the tabletop.
Dependencies are inferred from the claim text.