Abstract: A booster apparatus is provided for applying electrical power to a device in which a power source having positive and negative terminals is disposed in a housing, with electrical cables extending from respective positive and negative or grounded terminals to exterior of the housing, with an electrical switch interposed in one of said electrical cables interior of the housing manually actuable from outside of the housing, with an electrical circuit operatively coupled to one of the cables and the electrical switch, whereby the electrical circuit effects automatic closing of an electrical switch upon imposition of a predetermined minimum voltage to the cables, and effects opening of the electrical switch upon the second cable having a voltage less than the predetermined minimum voltage, and with a voltage comparator and its associated circuitry to indicate a level of charge for the power source.

Abstract: A hand-held router is provided that includes a motor with a router bit mounted on the motor in driven relationship. A router head is attached to the motor an at least partially surrounds the router bit. A device for controlling the depth of cut of the router bit is mounted on said router head as is a device for adjusting a second parameter of the cut. In one embodiment, the second controlled parameter is the width of cut made by the router bit. Preferably, a guide block is also movably affixed to the cut width adjustment device and acts as a guide to maintain the uniformity of cut of the router bit. The guide block is adjustable to accommodate workpieces of different thickness. In a second embodiment, the second controlled parameter is the angle of the cut. The router head is adapted for receiving an angular adjustment plate that can be used to determine the angle of attack of the router bit on the workpiece.

Abstract: A lifting and positioning apparatus particularly suited for use in the installation of wing-mounted airplane engines includes superposed upper and lower load-bearing support platforms that are connected to one another by means of a jack mechanism operable to raise and lower the upper platform while supported by the lower platform. The lower platform includes and is movably supportable on fluid cushion bearings. The upper platform supports a plurality of resilient elastomeric elevator bellows that are positioned and adapted to receive and support a heavy object, such as an aircraft engine, while cushioned against application of excessive lifting force. The bellows are independently inflatable and deflatable to effect raising and lowering of selected portions of the aircraft engine and thereby rotate the engine to desired angular orientations. Alternatively, the bellows may be actuated conjointly to effect uniform vertical raising or lowering of the aircraft engine.