Abstract: A DC motor control apparatus is disclosed comprising a first pair of switching elements coupled respectively with oppositely poled ends of the DC motor. A first actuating means is provided for actuating one of a first pair of switching elements in response to an input signal of a first predetermined logic content. The other of the first pair of switching elements is provided to respond to an input signal of a second predetermined logic content. Also provided, are means for applying a driving potential to the oppositely poled end of a motor simultaneously with the actuation of each of the first pair of switching elements, thereby establishing a current path for forward direction and reverse direction operation of said DC motor, respectively. A second pair of switching elements are respectively connected to oppositely poled ends of the DC motor.

Abstract: A filter device for a fuel tank comprises an upper wall for supporting in position a tubular member such as a fuel line or a pump casing, a bottom wall disposed at a distance from the upper wall, and a cylindrical wall supporting in position a mesh encircling the space intervening between the upper wall and the bottom wall. The cylindrical wall and either the upper wall or the bottom wall are integrally molded of a plastic material in one integral part, the bottom wall or the upper wall is molded separately of a plastic material in a separate part to be fitted to the free end of the cylindrical wall in the one integral part, one of the two parts which has an outer fitting peripheral wall surface is formed of a plastic material having a smaller rate of dimensional change, and the other part which has an inner fitting peripheral wall surface is formed of a plastic material having a larger rate of dimensional change.

Abstract: A gas turbine engine fuel control has a main hydromechanical fuel flow control and an electrically operable valve in series with the flow control for speed limitation purposes. The valve is controlled by a signal N.sub.L or N.sub.H derived from an engine speed transducer. A phase advance compensation circuit advances the phase of the transducer signal and its output is applied to an error amplifier which compares it with a datum (which may vary with altitude). The error signal is applied to a non-linear amplifier the amplification factor of which increases when a certain error threshold is exceeded. The combination of phase advance and non-linear amplification ensures rapid limitation of speed without introducing stability problems.

Abstract: A monitoring apparatus for a vehicle such as a tractor comprises a console including controls and a control circuit for calculating wheel slippage of at least one drive wheel of the vehicle and responsive to engine RPM of the vehicle and to the rotational speed of the drive wheel for calculating a predetermined relationship therebetween. The control circuit is also responsive to actuation of the controls for setting the calculated relationship equal to a predetermined reference value when there is substantially no load on the vehicle, and hence minimum slippage of the drive wheel, in each of a plurality of ranges of gear ratios of the vehicle, thereby calibrating the control circuit to calculate wheel slippage for each of these ranges of gear ratios. The console also mounts an observable indicator and the control circuit also calculates other variables such as vehicle speed and engine RPM and actuates the observable indicator when the calculated values deviate from preselected values.

Abstract: A touch responsive envelope control system is provided for use in an electronic musical instrument having a multiplexed keyboard, a plurality of assignable tone generators, each being assignable to producing a single note of one or more notes corresponding to one or more actuated keys of the keyboard and a keyer associated with each tone generating means for keying the generated tone with controlled attack time and decay rate and a controllable peak amplitude. The touch responsive system comprises a peak amplitude control system responsive to the actuation of each key for keying the associated tone with a peak amplitude corresponding to the intensity of actuation thereof. The peak amplitude control system includes an encoding circuit responsive to the actuation of each actuated key for producing an encoded intensity signal corresponding to the intensity of actuation thereof and a decoding circuit responsive to each encoded intensity signal for producing a corresponding peak amplitude control signal.

Abstract: A disposable lancet for use in obtaining blood samples comprises a plastic housing and a resilient blade in a retracted position within the housing, the blade being bent in an arcuate form to provide a source of spring energy biasing the piercing edge of the blade toward an opening in the housing. A releasable trigger means retains the blade in its retracted position in the housing but is readily operable to release the blade to cause the part of the blade with the piercing edge to be driven through the opening a predetermined distance.

Abstract: A temperature measuring system comprises a sensor which is connected to a supply rail through a first lead, and which may be selectively connected by a relay through a second lead or a third lead to the inverting input of an operational amplifier. The leads have different resistance values. The output of the amplifier is connected to its input through a resistor, and its non-inverting input is connected to the rail through a potential divider. The output of the amplifier is connected to a computer through a low pass filter and an A/D converter. In operation, the output voltage of the amplifier is first measured with the second lead connected to its inverting input and then measured again with the third lead connected. From these measurements the resistance of the sensor is calculated after calculating and hence eliminating the resistance of the leads. The sensed temperature can then be calculated from the resistance of the sensor.

Abstract: Mechanism for cutting a traveling printed web comprises a base adapted for mounting on a cylinder and a cutting die adapted to be mounted on the base. The cutting die cooperates with the anvil on an anvil cylinder for cutting the web. An elastomeric sheet is interposed between the base and the die and is yieldable within its elastic limits to displace the cutting edge toward the base as the cutting edge engages the anvil during the cutting operation.

Abstract: A dual alkali process and an apparatus for the removal of sulfur oxides from a gas stream containing such sulfur oxides, is disclosed.

Abstract: An improvement in a radio receiver having a power supply and an audio amplifier circuit comprises a switching circuit interposed between the power supply and the audio amplifier circuit and including a control input responsive to a signal of predetermined level for substantially cutting off the audio amplifier circuit means from said power supply. In accordance with one aspect of the invention, this control input may be coupled to a squelch circuit. In accordance with another aspect of the invention, this control input may also be coupled to an AGC circuit.

Abstract: A coupler for joining two objects comprises an insertion member attached fast to one of the objects and a reception member attached fast to the other object and used for admitting the insertion member into fast engagement therewith. The insertion member is provided with a setting portion for fast attachment to the aforementioned one object and a shaft extended from the setting portion and possessed of a radially expanded engaging portion at the leading end thereof. The reception member is provided with two generally semicylindrical shells connected to each other through a thin-walled hinge portion and adapted to form one cylindrical shape upon being closed onto each other along the matched edges thereof and a plurality of resilient engaging pieces regularly spaced in the longitudinal direction on the inner wall of each of the shells.

Abstract: Apparatus for applying a coating to a surface of a moving workpiece comprises a coating dispenser having at least one coating outlet spaced apart from the workpiece surface for dispensing a stream of coating. A dispenser control unit is operatively coupled with the dispensing means for initiating and terminating the dispensing of the stream of coating as predetermined parts of the workpiece surface come into alignment with the coating outlet. The invention provides an anti-tailing device coacting with the stream of coating intermediate the outlet and the workpiece surface for substantially preventing tailing of the stream of coating following termination of dispensing thereof.

Abstract: A groove having parallel walls is formed in the longitudinal direction of a blanket cylinder.A pair of retainers are attached to and along both ends of a blanket. The opposing end surfaces of the pair of retainers have alternating convexities and concavities arranged to permit the opposing surfaces to slide up and down relatively to each other. The total width of the pair of retainers with the convexities and concavities mating with each other coincides with the width of the groove. The pair of retainers are guided by the walls of the groove such that each retainer can be moved up and down along the associated wall independently of each other as a plurality of tensioning bolts are tightened or loosened.

Abstract: The invention overcomes the drawbacks of a conventional device employing a screw and a nut, in particular as concerns the mounting of the derailleur. This is achieved by providing on a support plate of the derailleur an elastically yieldable fastener which is permanently fixed on the support plate and adapted to cooperate with the frame lug so as to ensure that the support plate remains in position relative to the frame lug. The support plate further comprises means for centering the support plate relative to the frame lug.

Abstract: A fastener comprises a base formed of a flange and a plurality of leg pieces and a screw-receiving member adapted to be embraced between the leg pieces, whereby it is secured onto a given panel by a procedure which involves inserting the leg pieces into a fitting hole bored in advance in the panel, then inserting a fastening screw through a through hole formed in the flange into a screw hole formed within the screw-receiving member, imparting a helical motion of the fastening screw thereby drawing the screw-receiving member toward the flange, consequently causing the leg pieces to be spread outwardly within the fitting hole of the panel and brought into tight engagement with the fitting hole and, at the same time, enabling the fastening screw to be secured onto the panel through the medium of the base.

Abstract: An ignition system is provided for creating a continuous stream of high voltage pulses to each spark plug (8) over a predetermined period of time as controlled by the distributor (7). Below the transformer core (1) is positioned a switch (6) incorporating a plate (9) which is magnetically attracted to the transformer when a current flows through the windings. When the contacts of the contact breaker (5) open the supply from the battery (4) to the transformer core (1) is cut off so that the switch (6) closes under the bias of a spring due to the collapse of the magnetic field created in the core. Closure of the switch (6) restores the circuit from the battery (4) to the primary and secondary windings (2) (3) of the transformer and thus during the whole period that the contact breaker (5) is open the switch (6) will intermittently open and close, resulting in the application of a rapid series of high tension pulses to the respective spark plug (8 ).

Abstract: A link rod connector is formed to have two sections connected by a resilient hinge and each section is provided with a semicylindrical leg portion having a resilient catch. In use, the sections are closed onto each other to retain a link rod therebetween in such a manner that the link rod is rotatable within the sections but cannot be extracted therefrom, and then the cylindrical leg formed by the semicylindrical leg portions is inserted into a hole in a link arm so that the link rod is rotatable with respect thereto.

Abstract: A table extension for a table saw comprises a generally rectangular member extending from one end of the table, and a clamp for securing the member to a rail at that end of the table such that the top surface of the member and that of the table are substantially coplanar. A leg structure is secured to the underside of the member, which leg structure projects downwardly terminating in rollers which are adapted to engage a bearing plate on the saw table support. A pair of brace rods extend upwardly from the leg structure for engagement with a bottom plate on the underside of the extension.

Abstract: A lens case comprises an outer case member and a drawer with "left" and "right" contact lens wells slidable on the case member. Removable caps are friction fitted over each well, the caps also being hinged to the drawer. A foldout lid with a mirror is adapted for disposition over the caps. The arrangement is such that as the drawer is shifted to the closed position in the case member, a wall of the case applies pressure to the caps through the mirror or through tapered ribs on the caps to maintain the caps sealed on the wells.

Abstract: A machine tool comprises a work head in which tools are mounted in use and which is movable along a main beam in a Y machining direction. A tool selected from a tool storage matrix is held at an exchange position in readiness for exchange with a tool mounted on the work head. A carriage is movable along a subsidiary beam in a direction parallel to the Y machining direction and carries a pair of tool grippers. During a tool change, one of the grippers takes the tool from the exchange position and holds the latter while the carriage moves to the work head where it latches onto the latter by means of a latch device. The other gripper then removes the tool from the work head, whereupon said one gripper inserts the replacement tool in the work head. The carriage then unlatches from the work head and moves away therefrom, so that said other gripper can return the removed tool to the exchange position.