Abstract: The system includes a plurality of parallel-connected power field effect transistors arranged for connection in series with the traction motor with a common control circuit connected to the gate electrodes of the field effect transistors to control the on-off cycle of conduction through the field effect transistors. A plurality of parallel connected power diodes are arranged for reverse connection in parallel with the traction motor to serve as freewheeling diodes. The diodes are physically positioned apart from one another and distributed in position among the field effect transistors and each diode is positioned in a similar manner with a group of associated field effect transistors for ease of transfer of current flow between the diode and the associated field effect transistors.

Abstract: The final focus of a photographic enlarger is carried out by focusing the projected image on a photosensitive medium plane by adjusting the position of the projection lens, and then adjusting the distance of the photosensitive medium from the projection lens to achieve a critical focus.

Abstract: The method is especially useful for producing rock caverns for the storage of liquids such as water and oil. The method includes intersection blasting in accordance with the sublevel stopping method for at least one drift near the bottom of the intended rock cavern to produce at least one upwardly widening part section of the cavern. The cavern is then formed to its final cross-section by excavating rock above the part section through successive drilling and blasting of rock layers. The last-mentioned drilling is fan-shaped downwardly directed drilling to obtain an essentially lentiform cross-section of the cavern above the part section.

Abstract: The method produces an elongated rock cavern tunnel, or shaft, preferably with a large cross-sectional area. At least one drilling drift is first driven in the longitudinal direction of the cavern. From that drilling drift first drill holes are drilled in successive planes extending transversely to the longitudinal axis of the intended cavern. Charging and blasting is carried out in the first drill holes for excavating the cavern layer by layer.The first drill holes are drilled in an essentially ring or fan-shaped pattern and partially outside the intended contour of the cavern. Rock strengthening means is inserted beyond the contour in the drill holes prior to blasting so that the cavern walls and roof have such a degree of stability that work for reinforcing the walls and roof subsequent to blasting can be carried out within the cavern, or that the cavern can be used for its intended purpose, for example for storing liquids, without any further reinforcement following the removal of the blasted rock.

Abstract: For high speed electroerosion recording, this invention provides a polyorganosiloxane overlayer which includes high lubricity solid particles as a filler. The overlayer provides a combination lubricant and protective layer for the thin metal layer which is removed by electroerosion to prevent damage for the areas not removed by electroerosion. The polyorganosiloxane overlayer is preferably crosslinked, and is relatively hard, durable, and especially resistant to thermal degradation by the electroerosion arcing. This is important to avoid debris buildup at the recording electrodes resulting from the high temperature arcing for removal of the overlayer in the areas where recording takes place.

Abstract: The combination comprises a prosthetic vessel graft having a limited wall opening and a catheter device having at least two interconnected tubular arms extending through the wall opening and through the interior of the graft and through opposite ends of the graft. The end of each arm includes an inflatable balloon collar for secure connection to the interior of a vessel to be repaired by inflation of the balloon collar.In the method, the ends of the catheter arms are inserted and secured through small incisions in a vessel on either side of a section to be replaced by the graft. The section is removed, the graft is attached, the catheter is removed through the graft wall opening, and the wall opening is then closed.

Abstract: Door-swing restraint apparatus for a pair of latched doors closing an end opening of a cargo box comprises a chain or cable link connected between margins of the doors so that a person actuating a bar to release door latches will not be injured by freight items which bear against the door. One end of the link is fixed in the marginal edge of one door, the other end being fixed to a lever arm which can be selectably engaged with or disengaged from a lateral bracket on the latch bar of the other door, only when the arm is rotated out of its horizontal transport position into the vertical. Rotation of the bar due to torque exerted by a freight item pressing against the door is limited by a stop pin carried by the bar engaged in a slot in a door-mounted journal. The opening swing of the door is limited to a few centimeters as the link becomes taut and the lever arm remains horizontal, visually signalling the hazard.

Abstract: The system includes a digital integrator having a plurality of digital stages operable to store a numerical value in binary digital form which is indicative of state of charge. A switching circuit is provided for generating a series of voltage pulses on a single output line with each pulse corresponding in length to the binary digital value stored in the integrator to provide a time based resultant indication of the stored binary digital value. A filtering means is included to provide a substantially smooth analog output voltage having an amplitude corresponding to the summation of the pulses.The system preferably includes a delayed high voltage reset feature to set the integrator to a full charge state in response to voltage levels accompanying charging of the battery.

Abstract: Apparatus for burning spirit or similar fuel with a fuel container (10) filled with a fuel absorbing mass with partly exposed surface, from which fuel to be burned evaporates. A burner tube (16) is so arranged with respect to the exposed surface that suction of combustion air into the tube is secured. The fuel container is separate and removable from the apparatus and has top, bottom and side walls enclosing the absorbing mass. The top wall for forming the exposed surface includes a central opening, the area of which comprises a fraction of the total area of the upper top wall. The opening is surrounded by a rim portion (26) of the top wall substantially raised with respect to the rest of the top side of the container. The tube (16) is surrounded by an outer fixed tube (20) with an upper end extending above the level to which the burner tube is normally intended to extend.

Abstract: The invention relates to apparatus for determining the state of charge of electric storage batteries.The apparatus makes use of known quiescent battery (16) terminal voltage recovery characteristics after a prior energy transfer to predict the ultimate steady state terminal voltage as a measure of state of charge.

Abstract: A hoist cage is supported by a loop of rope extending around a drive sheave and an idler sheave respectively positioned at the ends of the hoist cage path and attached to the hoist cage by attachment of separate ends of the loop to separate drums rotatably attached to the hoist cage. The drums are coupled to rotate together to take up and pay out rope at different rates and in opposite senses with the rate being higher for the drum from which the rope extends downwardly.

Abstract: The cabling system comprises a latticework of crisscrossed cables with the cables which meet at a lower peripheral edge of the structure at opposite diagonal angles being formed from one continuous cable with an anchoring means comprising a sheave to permit adjustment in the length between the associated diagonal cables in response to unequal stresses.

Abstract: The structure includes a container having a bottom wall with slotted apertures having thin parallel side edge members through which tennis balls can be squeezed. At least one edge member of each aperture includes a roller to reduce the frictional resistance to the entry of the ball through the aperture. A support is provided for supporting the container with the bottom wall spaced above the supporting surface to prevent wear on the bottom wall.

Abstract: State of charge is determined for a battery during a quiescent interval with substantially no current flow through the battery by determining the quiescent time interval since the last substantial current flow through the battery, taking a rapid measurement of the battery terminal voltage, and relating the combination of these two measurements to known battery open circuit voltage recovery characteristics.

Abstract: The invention relates to rack and pinion lifts, which include a lift car which is driven via toothed wheels by means of an electromotor along a rack carried by a lift mast, said car containing a control and maneuver unit for the electric motor with a control and maneuver button set including floor call buttons, landing based call button units being connected to said control and maneuver unit via a ground level unit from which also a power cable leads to the lift car.In association with the lift car a sensor device is arranged to indicate passage of teeth of the rack or the toothed wheel and produce corresponding position impulses, which represent the position of the lift car.A micro computer system is connected for receiving the position impulses and for collecting and storing call impulses from the call units and destination impulses from the button set of the control and maneuver unit, and based upon the position of the lift car ordering travel direction, retardation and stop of the lift car.

Abstract: At least one, and preferably two, flashable lights are positioned near an exit door and are actuated in case of an emergency such as a fire or interruption of power. The lights are preferably located near the floor on opposite sides of the exit and are energized by emergency power supply batteries upon interruption of the main power supply. The main power supplied to the system may be interrupted by a fire detector device, and the system includes means for commencing the operation of the flashable lights upon any such interruption. Th flashable lights are preferably discharge tube photoflash lamps which are capable of emitting high intensity flashes.

Abstract: The toothbrush has an exterior structure resembling a traditional fountain pen case including a cylindrical end-cap cover which is removable to reveal the brush bristles. The device includes a main cylindrical body shaft having a cross section at the bristle end which is reduced to substantially a minor segment of a circle, and having toothbrush bristles extending transversely and confined within the circular profile of the transverse section of the cylindrical body shaft so that the end cap cover covers the bristles without interference when placed over the bristle end of the body shaft.

Abstract: Metal cross chains are interconnected on the inboard side by an inboard rope connector and on the outboard side by an outboard rope connector. Each interconnection of a rope connector with a cross chain includes a combined rope-to-cross chain connecting link and rope clamping ring and rope connector adjustment device having a substantially V-shaped wire body with a loop formed at each end of the V. One of the end loops is firmly clamped to the rope connector and the other one of the loops partially surrounds and slidably engages the rope connector and is open sufficiently to permit the rope to be slipped out of that loop. A collar is clamped to the rope at a position to maintain a loop in the rope between the two connecting link loops when the collar is inside the slidably engaged loop, and to permit the rope loop to be released when the collar is positioned outside of the slidably engaged connecting link loop.