Abstract: A rotatable gutter system that includes a gutter and a pair of support members each located at an opposite end of the gutter to mount it onto a building. The gutter is rotatable relative to the support members about an axis that extends between them. The gutter includes a drive member accessible through an opening in one of the support members. Rotation of the drive member causes concomitant rotation of the gutter. In this way, the gutter can be inverted for easy cleaning and for storage during winter months to prevent ice buildup in the gutter. An elongated drip edge can be provided above the gutter such that it contacts an outer surface of the gutter when it is rotated to a closed (inverted) position. The gutter can have an end piece at each end with the drive post being a unitary extension of that end piece.

Abstract: An apparatus(19) for holding a testing substrate in a wafer prober (16) has a plate (34) hinged to a head stage (18) of the equipment. The plate has two concentric openings to form a ledge (35) for holding the testing substrate (10). Additionally, the ledge has two asymmetrically placed locating pins (38) to allow automatic alignment of the testing substrate which has corresponding alignment holes. A latch (36) locks the plate against the head stage to securely fix the testing substrate in place so that it can make and maintain contact with a pogo pin area (26) on the head stage. The tester also has a wafer support chuck (20) upon which a semiconductor wafer (22) is placed with its active surface up. The head stage of the tester is closed so that the testing substrate contacts the active surface of the semiconductor wafer, and electrical testing may then be performed on the semiconductor wafer.

Abstract: A gas generator for a long range missile is driven by a solid propellant in assembly which includes a cylindrical inhibitor, a forward closure assembly that is attached to one end of the inhibitor and a propellant grain that is cast into the cylindrical cavity formed by the interior surface of the cylindrical inhibitor. Between the grain and inhibitor and between the grain and forward closure assembly is an adhesive bonding system for attaching the grain to the inhibitor and forward closure assembly. The exposed or aft end of the grain is the initial burning surface and includes a plurality of annular concentric grooves and a configuration that provides optimum burn progression that results in a complete high pressure burn. The external surface of the inhibitor is machined so that the solid propellant grain assembly may be readily inserted and removed from the gas generator.

Abstract: A tow bar coupling head removably attachable to the cross pin of an aircraft nose wheel strut has a solid metal body portion with a transverse slot in its underside within which the cross pin is received. A positive deadbolt slide lock retains the cross pin in place. A removable locking pin extending vertically through the body portion prevents accidental withdrawal of the deadbolt slide lock.