Abstract: The sash lock has a rotatable cam which engages the keeper. The sash lock has a slide plate mounted below the cam and the slide plate moves between a retracted position in which its leading edge is flush with the sash to which the lock is mounted. In an extended position in which the leading edge of the plate extends far enough to block the narrow gap between the sashes. The slide plate is mounted for movement perpendicular to the edge of the sash and parallel to the plane of the top surface of the sash. The slide plate includes an arcuate recess in one side of the plate which is engaged by a pin extending from the rotatable cam. The recess in the slide plate is contoured so that during initial portion of the movement of the cam from its open position toward its locked position, the slide plate does not move.

Abstract: A closure for an opening in the surface of a drum or barrel, especially for a drum or barrel which has been reconditioned by heating so that the original gaskets have been burned out of the opening. The closure includes a cylindrical sleeve disposed in the opening and having a threaded inner surface. The threads of an externally threaded cylindrical cap engage the threads of the sleeve. The cap has an annular generally circular lip about its outer periphery and at its outer end, which lip extends perpendicularly to the sleeve adjacent the outer end of the sleeve so that the outer portion of the lip is parallel to the drum surface. A flexible resilient cylindrical gasket is coaxially mounted external to the sleeve so that the gasket lies between the lip and the drum surface. When the cap is screwed inwards into the sleeve, the lip compresses the gasket against the surface of the drum so that the gasket is squeezed and deforms, and thus so that the gasket forms a closure seal against fluid flow out of the drum.