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Ltv Aerospace & Defense Company

Ltv Aerospace Corporation

Roy A Nelson

A small console containing a keypad such as an elastomeric array keypad and a microprocessor which is preprogrammed with a number of simple algorithms. The individual keys (switches) are preferably, although not necessarily, hidden to the user and are arranged in sets providing, for example, 8 data lines each having a plurality of keys associated therewith some lines of which, for a particular algorithm, are redundant, and other dedicated keys. The user directly programs the device at the keypad by inputting the solution to the particular question. The data inputting is provided secretively by using an overlay placed over the keypad on the console. The overlay provides some pictorial and text description of the game. The overlay is basically demarcated into a programming region which provides a visual instruction to the user for the temporary programming of the device by pressing an indicated sequence of keys in an indicated order, and a play region which visually indicates the selection of possible notations, each associated with a key, including correct and incorrect notations. The correct keys in the play region simply correspond to those previously inputted during the program step. Because the overlay hides the keypad and because of the preferred random spacial distribution of keys of each set, the user is unaware of which keys input the same code as the ones previously used to program the device.

Teaching device and method of using same

A structure capable of being expanded and retracted. The structure includes a pair of cells each including a plurality of leg elements which are pivotally joined at one end to form an apex point and which are pivotally joined at their opposite ends from the apex point connection to the corresponding leg element from the other cell to form a plurality of common base points. The structure also includes a plurality of hinged elements connected between adjacent common base points to thereby form a common base and the hinged elements each have a pair of sections that are connected at a hinge point approximately midway between the adjacent common base points to which the other end of each section is connected. The structure further includes an actuator means having its ends pivotally attached to the apex points and a means associated with the actuator means for biasing the apex points to which the actuator means is attached towards and away from each other whereby the leg elements pivot about the apex points and the base points, the sections of the hinged elements pivot about the base points and the hinge points to thereby expand or retract the structure, respectively.

Biaxial scissors fold, post tensioned structure

A self steering vehicle for a transportation system including a roadway having a pair of elongated parallel tracks whose shape in cross-section is domed or convex and preferably having a pair of guide flanges positioned outwardly of the tracks, the vehicle having wheels provided with resilient track-engaging means, such as pneumatic tires, and driving means for propelling the vehicle over the roadway. The wheels of the vehicle tend to follow the tracks because of the deformation of the tires if they tend to move laterally off the center portions of the tracks, and the guide flanges engage the tires, upon the wheels having moved off the tracks because of the imposition of excessive side loads on the vehicle, to turn the wheels back onto the tracks.

Growing community of inventors

Grand Prairie, TX, United States of America

Roy A Nelson