Abstract: The disclosure describes a data processing system including a program memory for storing a first instruction at a first address and a second instruction at a second address. The system includes a look-ahead feature in which the second instruction is stored in a buffer register while the first instruction is being stored in an execution register and is simultaneously being executed. A gate circuit controls the transmission of data between the buffer register and the execution register. If a third instruction having a third address is read into the program memory while the first instruction is being executed, the second and third addresses are compared. If the second and third addresses are identical, the gate circuit is inhibited and the second instruction is prevented from being transmitted to the execution register. Instead, the third instruction or a portion thereof, is transmitted to the buffer and execution registers, so that the third instruction is executed in place of the second instruction.

Abstract: The disclosure describes a data processing system including a program memory for storing a first instruction at a first address and a second instruction at a second address. The system includes a look-ahead feature in which the second instruction is stored in a buffer register while the first instruction is being stored in an execution register and is simultaneously being executed. A gate circuit controls the transmission of data between the buffer register and the execution register. If a third instruction having a third address is read into the program memory while the first instruction is being executed, the second and third addresses are compared. If the second and third addresses are identical, the gate circuit is inhibited and the second instruction is prevented from being transmitted to the execution register. Instead, the third instruction, or a portion thereof, is transmitted to the buffer and execution registers, so that the third instruction is executed in place of the second instruction.

Abstract: A bar holder arrangement for holding bar stock material to be fed to a machine tool, comprising a plurality of guide members each having a semi-circular recess therein, said guide members co-operating each with another of said guide members in pairs to define a plurality of circular receiving means for bar stock material and each of said guide members being pivotably mounted about a respective axis perpendicular to the longitudinal extent of the bar holder arrangement so as to be pivotable outwardly to permit passage between the co-operating pairs of guide members of a bar feed member having a diameter greater than the diameter defined by the circular receiving means of said pairs of guide members.

Abstract: A frame assembly for a scraper-chain conveyor which is usable as a drive or reversing station. The assembly has bearing units, which are supported by spaced-apart side walls. A shaft carrying a chain wheel for engagement with the scraper-chain assembly of the conveyor is mounted for rotation between the bearing units. The chain wheel is constructed from separate parts and can be readily attached to or detached from the shaft without removing the latter. The bearing units have hollow projecting parts which accommodate bearings for the shaft which are protected by seals. These projecting parts smoothly merge with the exterior of the chain wheel. The shaft has hollow end portions provided with splines which can be coupled to a journal introduced into the associated end portion from the exterior of the associated bearing unit which also provides access to the bearings and seals. This journal can then be coupled to a drive means to effect rotation of the shaft.

Abstract: An air-fuel ratio sensing device for an air-fuel ratio control system of an internal combustion engine, which device includes a sensing element exposed to exhaust gases passing through an exhaust gas passageway. A housing surrounding the sensing element has a plurality of openings to admit the exhaust gases into the housing, and a plurality of temperature responsive valves associated with the openings, respectively, which are closed when the exhaust gases exceed an excessively high temperature to prevent the sensing element from being deteriorated due to excessively high temperature of the exhaust gases.

Abstract: A longwall conveyor composed of channel sections arranged end-to-end and a scraper-chain assembly moved to transfer material along the channel sections has a main drive station at one end and an auxiliary drive station at the other end. Each drive station has a frame rotatably supporting a drum around which is entrained the scraper-chain assembly. Drive motor and gearing units are carried by the frames and drive the drums. At each drive station there is a housing in which a sprocket wheel drivably engages with a chain used to haul a plough or a similar machine along the conveyor. Drive motor and gearing units are supported by the housings and drive the sprocket wheels. The housing and sprocket wheel at the main drive station is slidably mounted on the frame and a piston and cylinder unit effects slidable displacement of the housing to vary the tension in the drive chain.

Abstract: A radio receiver squelch circuit responds to an IF carrier modulated by any of AM voice, AM pulse, CW, interrupted CW, or angle modulated signals. After the IF carrier is amplitude normalized it is supplied to a network for deriving a D.C. voltage having an amplitude indicative of the signal to noise level of the normalized IF. The signal to noise level indicating circuit includes a detector for deriving a waveform that is a replica of the envelope of the normalized IF. In response to the envelope amplitude being above a predetermined threshold level, indicative of the presence of a signal, a capacitor is discharged by a constant current source. In response to the envelope being below the predetermined level for an initial predetermined time, the capacitor is charged by a constant current source. In response to the envelope amplitude being below the predetermined level for in excess of the initial predetermined time, the capacitor is charged by a much smaller current.

Abstract: The assembly is for shearing rod sections with a movable cutter carriage carrying a shearing blade between a resting position and a shearing position. A reciprocating impact head is used to drive the cutter carriage. The impact head is moved into contact with an adjacent end of the cutter carriage to effect motion of the cutter carriage to the shearing position. The cutter carriage is biased toward the impact head and the resting position to effect the return stroke motion of the cutter carriage. The contact of the impact head with the adjacent end of the cutter carriage is broken on completion of the return stroke to draw the impact head a predetermined distance back to a starting position from which the impact head is ready to strike the adjacent end of the cutter carriage with considerable momentum upon the starting of the next shearing cycle.

Abstract: Power supplies having power input excitation terminals and power output terminals are tested under differing load and excitation conditions. Excitation sources having differing parameters are selectively connected to the input terminals. A variable impedance load is connected to the output terminals. Voltage measuring apparatus is selectively connected to be responsive to the voltage derived from the selective connecting means and the voltage across the load and is selectively connected to a readout means. A dynamic signal source derives control signals for respectively controlling the parameters of the excitation sources, the impedance of the load, and the connections of the readout means and the measuring apparatus.

Abstract: In a braking fluid pressure control device, a push rod engages against a blind end of a bore extending inwardly and axially with respect to a plunger. Between the plunger and the push rod, the bore provides clearance increasing from the blind end of the bore toward an open end thereof. The push rod projects from the open end of the bore outside the plunger and engages against a plunger seat slidably fitted in a housing bore. The push rod is biased by a spring which is compressed between the plunger seat and a piston. As a result, a radial force is prevented from acting on the plunger as the plunger is urged by the piston. This avoids damage to an inner wall by the plunger increasing the durability of the control device.

Abstract: An interface connects a data-processing unit to a group of m working stations, each including items of data emitting and receiving apparatus. The unit and each of the items of apparatus transmit and receive binary data in parallel characters in response to control signals generated by the unit. The characters are coupled between the interface and stations as serial bits via a separate channel that extends to each station. Each channel includes separate lines for sending the characters in opposite directions. At the interface, there are provided m transmitter/receiver circuits, one of which is associated with each of the m stations. There is a transmitter/receiver circuit associated with each item of apparatus at each of the stations. Each transmitter/receiver circuit includes a parallel to serial converter for each parallel input character supplied to it and a serial to parallel converter for each series character applied to it.

Abstract: An inorganic acid typified by H.sub.2 SO.sub.4 is added to an aqueous slurry of (NH.sub.4).sub.3 AlF.sub.6 and either Al(OH).sub.3 or Al.sub.2 O.sub.3, and the resulting mixture is kept for a while under the atmospheric pressure at or somewhat above room temperature. The acid is added preferably in such an amount that the pH of the slurry after completion of the reaction is 4 to 7.

Abstract: In a closed loop electronic fuel injection control unit having a basic fuel schedule in response to engine operating conditions, the amount of oxygen in the exhaust gases is detected and compared with a desired value to provide an error signal. The error signal is shaped to form a series of binary pulses of alternating voltages of constant amplitude in correspondence with the plus and minus deviation from the reference voltage which represents the desired oxygen quantity. The binary pulses are amplified by a variable gain amplifier to provide a signal which is used to adjust the basic fuel schedule. The time duration of each binary pulse is measured by a counter to provide an output when a pulse width reaches a predetermined interval. The counter output is coupled to the amplifier to increase the amplifier gain to change the rate of fuel supply.

Abstract: A mine roof support comprises at least one pair of hydraulically extensible chock legs connected at upper ends in articulated manner between one or more roof beams of the support and connected at lower end in articulated manner to one or more base members of the support, a rigid yoke located at a position spaced from the base member(s) between and connecting either the pair of chock legs, the yoke containing between the chock legs a projecting pin secured in a bearing attached to the yoke, or one of the pairs of chock legs, the yoke containing two projecting pins each pin being secured in a bearing attached to the yoke, and the or each pin having a lateral base contained at one side between abutment surfaces secured to the base member(s) and at the other to one end of a load applying means, the other end of the load applying means being supported from the base member(s).

Abstract: An irradiation device for the uniform irradiation of goods by means of electro-magnetic radiation having a quantum energy larger than 5 KeV comprises at least one radiation source, means for the reception of goods to be irradiated, and at least one shielding element arranged laterally of the radiation path from the radiation source and the center axis of the goods in such a manner that the shielding effect of the shielding element increases with increasing lateral space from this radiation path. The radiation source, the shielding element and the means for the reception of the goods to be irradiated are arranged to allow for the radiation to enter the goods through the entire superficies thereof in such a way that the region immediately around the center axis of the goods is irradiated without radiation being affected by the shielding element.

Abstract: The oxygen component of exhaust gases from internal combustion engine is sensed and compared with a reference value which represents the stoichiometric air-fuel ratio of the engine to provide an error signal at one of two discrete values depending on whether the amount of oxygen component is above or below stoichiometry. The error signal is connected to integrating and/or proportional controllers. Operating parameters of the engine are sensed to control the integrating and/or proportional gains of the controllers upon the sensed parameters reaching a predetermined value. The output from the controllers is used to control the air-fuel ratio of the engine.

Abstract: A lever arm lock for a conventional quick-release hub assembly includes a cover mountable to a first skewer rod end nut supporting a quick-release lever arm. The cover is secured to the end nut with a locking mechanism (combination, magnetic, key, etc.) and maintains the lever arm in a locked position making it impossible to remove the hub. A second skewer rod end nut opposite the first end nut is formed with a substantially smooth outer surface that is continuously inclined with respect to the axle. This surface configuration prevents removal of the locked hub assembly by turning the second end nut with a pliers or other tool. The lever arm lock also prevents the hub from being jarred loose on impact with curbs, rocks, etc. The end nut assemblies have extensions which abut the frame thereby preventing loosening thereof for unauthorized removal.

Abstract: Device for applying lubricant to the workpiece and/or working surface of the punch of a multistage forging press. Channels are provided between the stepped holding pin of the punch and the wall of the stepped bore in which the holding pin reciprocates. The channels are connected via the interior of the punch to an external lubricant reservoir. The space formed with each stroke of the punch between the shoulders of the holding pin and its stepped bore acts as a pumping space. Each punch stroke causes lubricant to be drawn from the reservoir into the pumping space and subsequently forced out through the channels. Means are also provided by which the supply of lubricant from the reservoir can be more closely regulated in time with the working stroke of the press.

Abstract: A joint construction for connecting together two members, one of the members having opposed side limbs connected by a base defining a trough-like shape, the base having formed therein a re-entrant trough-shaped recess extending longitudinally of the member, the base of re-entrant trough-shaped recess having a plurality of slots adapted to receive hook-shaped tongue elements provided on the other of said members said other member also being of trough-shape and is in contact with the substantial part of said one member when engaged therewith.

Abstract: A game apparatus comprises a board and playing pieces. The pieces comprise two differently colored sets. The board comprises a game zone having paths defined thereon and a central zone within the game zone. There are three sets of paths. A first set includes at least five endless paths in an expanding series from an inner endless path of the series to an outer endless path of the series. A second set includes at least five direct paths which extend directly outwards from the inner endless path to the outer endles path so that points of intersection are defined where the direct paths intersect the endless paths. A third set of at least five oblique paths form an expanding concentric series in which each path extends obliquely outwards beginning at one of the points of intersection between the inner endless path and a direct path to one of the points of intersection between the outer endless path and a direct path.