Sewing machine cradle safety interlock

A cabinet for a sewing machine having a top surface provided with an opening through which a sewing machine may project, a sewing machine, a platform having the machine mounted thereon and being movable with respect to said top surface into either a first position within said opening below the level of the said top surface and substantially horizontal for sewing, or a second position extending downwardly under said top surface for storing the sewing machine when not in use, latch means with mutually engagable parts on the cabinet and said platform for selectively retaining the platform in said first position, the latch means being capable of being unlatched by raising said platform a predetermined amount from the said first position, a flap hingably attached to the cabinet and disposed within said opening, said flap being movable with respect to said top surface from a position substantially coplanar with said top surface to positions approximately 90 degrees above and 90 degrees below said top surface, and interlock means mounted on the cabinet for movement into and out of a position wherein the interlocking means supports said flap in the said position substantially coplanar with said top surface and wherein the interlocking means interferes with upward movement of the platform by said predetermined amount to prevent the unlatching of said latch.