Abstract: A nestable pallet includes a first frame, at least one corner foot extending away from the frame, and at least one off-set corner foot extending away from the frame. The at least one corner foot being complementary with the at least one off-set corner foot, such that the pallet is nestable with a substantially identical pallet in a first nesting configuration and a second nesting configuration. In a preferred embodiment, the first frame includes a structural sheet fixed to the frame.

Abstract: A jewel case for compact disks has a hinged lid and base held in the closed position by both a breakable tab extending from the base though a mortise in the lid and by a dimple and protrusion forming a detent. Initial opening of the jewel box requires a sufficient force to break the tab. Later openings require less force sufficient only to release the detent. The hinge is formed of pins received in sockets, the pins and sockets being disengageable only when the lid and base are in the open position. The tabs have camming surfaces to permit them to engage the mortise in the lid by deflecting sidewalls of the lid apart.

Abstract: A vertical file assembly which is easy and less costly to manufacture with injection molding techniques has (1) a divider unit with spaced apart dividers rising from an integral base panel to form compartments for books, catalogs, file folders and documents and (2) two wedge-shaped adapters each with a pair of barbed projections projecting inwards from an upper edge. These projections are inserted in receiving slots and latched in apertures formed in the bottom of the base panel of the divider unit. When the adapters and divider unit are assembled, the base panel slants upward from front to back to elevate each divider a certain measure above the preceding divider. The wedge-shaped adapters also have tabs with ledge portions which slide along the sidewalls and are caught in niches in the sidewalls of a supporting letter tray.

Abstract: A vapor core centrifugal fuel pumping system (10') has a main flow impeller (72) and a low flow impeller (81) mounted upon the front plate (74) of the main flow impeller. Both of the impellers receive flow from an inlet passage (26') which proceeds past an inlet throttling valve (114). During pumping operation of the low flow impeller, a surface (122) on the inlet throttling valve forms a labyrinth seal with the radially inner lip (120) of the front plate to reduce inlet fuel flow entering the main impeller. A first check valve (124) and a second check valve (126) respectively prevent flow from the low flow impeller from entering the main flow impeller and flow from the main impeller from entering the low flow impeller. The second check valve is associated with conduits (140, 142) to evaculate liquid adjacent the main impeller during operation of the low flow impeller to reduce windage losses.

Abstract: A centrifugal main fuel pump (10') for a gas turbine engine has a housing (18') in which a centrifugal impeller (12') is mounted for rotation. The impeller discharges flow to a collector (20') and diffuser (22'). A low flow diffuser (26) has its inlet opening positioned closely adjacent the outer periphery of the impeller. Proper design and placement of the low flow diffuser ensures that a high percentage of the fluid energy available in the high velocity flow adjacent the impeller outer periphery is recovered as pressure rise. The low flow diffuser produces adequate fuel flow at the pressure necessary for engine light-off while the first mentioned diffuser recovers a lower pressure rise but is adapted to supply higher engine fuel flow demand in the normal range of operation. A check valve (34) prevents flow from the low flow diffuser from returning to the impeller. The check valve opens to allow the first mentioned diffuser to supply fuel when its discharge pressure exceeds that of the low flow diffuser.

Abstract: A fuel control for a gas turbine engine has an actuator (24) for a fuel metering valve (22) which includes two stepper motors (46 and 48) which selectively drive a differential mechanism operatively connected to the valve. The differential mechanism includes two identical gear assemblies (60, 64) which are mounted for rotation upon a shaft (26) connected to the valve. The gear assemblies include worm gears (58, 62) in engagement with worms (54, 56) driven by the stepper motors and bevel gears (68, 70). A spider bevel gear (66), carried by the shaft, is in meshing engagement with the bevel gears of the gear assemblies such that rotation of one of the gear assemblies with the other at rest causes a circumferential movement of the spider bevel gear which rotates the shaft and positions the valve. Two identical electronic control units (A, B), which each sense selected engine parameters are respectively connected to the stepper motors for controlling their operation.