Abstract: A pivotal roof fence unit comprising elongated base members for attachment to a roof surface member extending the entire length of the unit and, at least at both ends of the unit, cross members and buttresses used to support the fence member, and pivotal connecting means for connecting the upper portion to the base members such that the upper portion may be pivoted either forward or backward relative to the long axis of the base members.

Abstract: A number board apparatus for teaching beginning set and number theory to young or educationally handicapped children and including a carrying tray having a generally rectangular base with an upright sidewall rising from each of its edges, a plurality of work blocks freely slideable on a top surface of the base until contacting a sidewall or another block, each work block having indentations in the form of a numeral and/or a rectangle which are receptive to removable numeral or rectangular unit marker pegs, respectively. Several optional members such as covering boards and specialized work blocks may also be used with the number board apparatus.

Abstract: A read/write head-positioning apparatus for positioning one or more heads in a disk recorder and including a magnetic stator assembly having a coaxial, longitudinally-extending, annular coil-receiving cavity and a pair of longitudinally-extending, air bearing forming passageways provided therein, and an armature assembly including a pair of main bearing shafts disposed to pass through the passageways and a member affixed to the shaft ends for carrying a cylindrical coil support adapted to carry a drive coil within the coil-receiving cavity and for receiving the head-carrying arms. A pump is coupled to the stator assembly to create an air bearing flow in the passageways around the main bearing shafts so that electromagnetic interaction between the drive coil and the magnetic stator assembly can be used to position the recording heads with a minimum of frictional resistance.

Abstract: A luminous effects device including a partially silvered mirror, a frusto-conical reflector having a plurality of lights disposed about its inner periphery and a spherical reflector, all of which are disposed within a closed container and aligned in series so that multiple reflections occur between the partially silvered mirror, frusto-conical reflector and spherical reflector to create an endless tunnel effect that can be viewed through the opposite side of the partially silvered mirror.

Abstract: A tree-type combinatorial logic circuit comprising a plurality of identical functional units which may be arranged to operate as an N-bit magnitude comparator, a carry generator for an N-bit adder, or a parity predictor for 2N-bit binary counter. Each of the units is provided with four input terminals and two output terminals. The units are arranged to form a binary tree. Each unit has an internal logic circuit which generates outputs of G.sub.K*l =G.sub.K VE.sub.K .multidot.g.sub.l and E.sub.K*l =E.sub.K .multidot.E.sub.l, where "V" and ".multidot." denote Boolean OR and AND operations, respectively. The desired functions are provided at the output terminals of the unit in the final stage of the tree.The input signals to the units in the first stage of the tree depend on the applications of the circuit. When used as a magnitude comparator, the inputs are a.sub.i .multidot.b.sub.i 's and a.sub.i.sup..sym. b.sub.i 's (i=0, 1,..., N-1), where a.sub.i and b.sub.

Abstract: A clocked memory comprising a memory matrix having a plurality of memory cells arranged in rows and columns on a semiconductor substrate; a plurality of word select lines in said memory matrix, a plurality of bit lines crossing said select lines and connecting to said memory cells in each column; a drive circuit for driving said word select lines; a plurality of presence amplifiers connected to said bit lines; and a sense clock line parallel to said word select lines and connected to a gate of a transistor in said presence amplifier; and a presense drive circuit connected to said sense clock line and operated by a clock signal, said presense drive circuit having a transistor with controlled charging capability so as to conduct said transistor responsive to the charge of the memory cell in said each column.

Abstract: A positioning mechanism for a read/write head of recording/playback machine of the type utilizing discs upon which information is magnetically stored in concentric tracks includes a stationary guide member, a carriage which is connected to the guide member and which carries a read/write head for compliance to the surface of a disc upon which information is magnetically stored, a single capstan member which is driven to rotate incrementally from one angular position to another, and a flexible nonstretchable band which is wound at least once about the capstan and which has opposite ends extending from the capstan to connection to the carriage. During the period of rotation of the capstan, one end portion of the band is fed off the capstan while the opposite end portion is concommitantly wound onto the capstan; the tension exerted by the end portion which is wound onto the capstan draws the carriage member into motion relative to the guide member.

Abstract: A joystick mechanism for transducing vector motion of an end of a joystick into its X and Y components including: an X-potentiometer having a body and a shaft, a bracket for mounting the body of the X-potentiometer to a surface, a Y-potentiometer having a body and a shaft, a rod connecting the shaft of the X-potentiometer to the body of the Y-potentiometer so that the shafts of the X and Y-potentiometers lie at right angles to each other, and a joystick having one end attached to the shaft of the Y-potentiometer and which is oriented such that its effective axis lies at a right angle relative thereto.

Abstract: A bicycle rack including an elongated load support frame, a U-shaped main strut attached to a mid-length portion of the support frame so that its two legs extend downwardly therefrom, a substantially V-shaped lateral bracing strut attached to an end portion of the support frame so that its two legs extend downwardly to attach to respective legs of the main strut, and a U-shaped stiffening strut attached proximate the other end portion of the support frame so that its two legs extend downwardly to attach to respective legs of the main strut, and an elongated bracket to connect the frame of the rack to the bicycle.

Abstract: A multiple shutter device for displaying digital information and including an opaque face plate having a plurality of transparent windows situated thereon, a shutter support plate facing and closely disposed behind the face plate and having a plurality of opaque shutters situated thereon, each shutter in unique alignment with one of the segment windows, a multi-track grooved rotary cam facing and closely disposed behind the shutter support plate, a plurality of cam follower arms each being pivotally attached to one of the shutters at a first end and having a second end provided with a cam track following pin which engages a track on the cam, each arm further having a point intermediate the first and second ends which is pivotally attached to the shutter plate, whereby rotation of the cam causes various combinations of the shutter to be actuated to open and close the segment windows and sequentially display one or more digital characters.

Abstract: An improved load control apparatus for use in a two wire installation in which interconnection of the two wires is effective to energize a series connected load such as a light bulb, and including a power supply for developing a power supply potential and 60-Hz clocking pulses from energy obtained from the two wires, a coupler responsive to a command signal for alternately substantially preventing and permitting a light bulb energizing current to flow between the two wires and in both states for permitting energization of the power supply and a control logic energized by the power supply potential for counting the clocking pulses and for developing at preset times the coupler command signal whereby the switching apparatus in a first mode reduces energy consumption by turning off a light left on after business hours and, in a second mode by cycling a light in a predetermined pattern to discourage burglaries.

Abstract: The electronic musical instrument is provided with a musical tone signal generating unit for generating a musical tone signal having a tone pitch corresponding to a depressed key, a self-running counter for counting a multibit digital quantity, a latch circuit for latching the output of the counter when supplied with a pulse signal representing the depression of a key, and modifying means responsive to the output of the latch circuit for modifying the musical tone elements, that is the pitch, color and volume of the musical tone signal generated by the musical tone signal generating unit.

Abstract: A fish tackle tool including a line cutter having a slotted base portion and a blade portion which cuts fishing line placed in the base slots and a wedge shaped line threader which holds a hook and has a slot for guiding a fishline through the eyelet of the hook.

Abstract: A modular-type integrated circuit burn-in apparatus including a power supply for developing integrated circuit biasing potentials, an oven and a plurality of modules each having a plug-in pattern generator for generating integrated circuit exercising signals of a type programmed by a first plug-in header, a plurality of driver cards for fault monitoring and for developing amplified exercising signals on output pins programmed by a second plug-in header, a plurality of socket cards carrying the integrated circuits to be burned-in, and with said modules being removably disposed in a rear wall of the oven having connectors on the outside of the oven for receiving the pattern generator and the driver cards, and connectors on the inside of the oven for receiving the socket cards, the modules being operative to couple the power from the power supply to the pattern generator and the driver cards, the exercising signals from the pattern generator to the driver cards, and the amplified exercising signals and power fro

Abstract: A inker network for use with a tester and a probing machine for marking semiconductor wafers and including a delay circuit for receiving clocking pulses and a first ink command pulse from the tester and for generating a delayed ink command pulse which is delayed an integer number of clock pulses, a direction detector for receiving first and second transport signals from the probing machine and for generating first and second direction signals dependent on the direction the wafer is being transported, and a steering circuit responsive to the delayed pulse in one mode and for generating a double pulse of adjustment width and amplitude on first or second output lines in response to the first and second direction signals, respectively, and in a second mode for generating the double pulse of adjustment width and amplitude on the first or second or both of the output lines in response to the first or second ink command pulse from the tester or both pulses simultaneously, respectively.

Abstract: A pulse width modulated DC motor speed control circuit for models including a demodulator for receiving an input pulse having a width which may vary from a reference width, and for generating a first positive output pulse having a width proportional to the variation when the width of the input pulse is less than the reference width and for generating a second positive output pulsehaving a width proportional to the variation when the width of the input pulse exceeds the reference width, and a braking circuit for receiving the first output pulse and in response thereto causing any back EMF generated by the motor to be shorted for the duration of the output pulse, and a driving circuit for receiving the second output pulse and in response thereto connecting a source of power across the motor for the duration of the output pulse.

Abstract: A recognition and identification key comprising a substrate formed from an electrically insulating material, a first sheet of conductive material formed on a first surface of the substrate in a looping pattern so as to provide an inductive element, and a capacitive element coupled to the first sheet such that the elements are resonant at a first frequency, at least one of the inductive and capacitive elements capable of being changed such that the key is resonant at a second frequency, and a method of adapting the resonant frequency.

Abstract: An improved hub-locking device for conveyor pulleys including a spherically shaped collet having a centrally located bore for receiving a shaft and having an axially aligned slot extending through one side thereof permitting compression of the collet on the shaft, a hub attached to the end of the pulley and having an axially aligned tapered aperture for partially receiving the collet with the shaft therein, a clamping ring having a tapered aperture for partially fitting over the collet and a plurality of bolts for passing through holes in the clamping ring, for threading into the hub and for drawing the clamping ring toward the hub compressing the collet therebetween, causing the collet to compress and engage the shaft, the hub and the clamping ring.

Abstract: A cathode-ray display panel comprising first and second transparent substrates which constitute an envelope, a transparent electrode arranged on the first transparent substrate, a photoconductive layer arranged on the transparent electrode, a plurality of phosphor members arranged on the photoconductive layer, electrically insulating opaque substances embedded between the phosphor members, at least one cathode electrode for emitting electrons and at least one grid electrode for uniformly distributing the electrons emitted from the cathode electrode onto the phosphor members.

Abstract: A new variety of chrysanthemum plant originating as a sport of Horim (unpatented) and characterized by satiny golden blooms, vigorous growth, three month response and permanence.