Abstract: A digital-analog converter electrically effecting sequential switching between a reference voltage point and each of the connection points formed in a circuit network composed of serially connected impedance elements for taking out desired analog quantity such as signal voltage level, impedance value or the like in response to the application of control pulses, which comprises in combination memory circuits such as R-S flip-flops, gate circuits such as NAND gates and delay circuit such as integration circuits, capacitors and the likes. The provision of the delay circuits, in particular, advantageously facilitates the setting for the initial operation state and the preparation for the sequential switching.

Abstract: The present accelerometer uses the total light reflection of a prism for suring an acceleration force by disturbing such total reflection in accordance with the displacement or deflection of a body located close to a boundary surface of said prism, and responsive to the movement of an inertia mass which in turn responds to the acceleration force. The reflected light is measured by a photosensitive device and the resulting electrical signal is a direct measure for the size of the acceleration force. In order to make the measuring of the acceleration force independent of variations in the intensity of the light emitted by a light source used as part of the accelerometer, a reference signal may also be produced to form a quotient of the measured signal and the reference signal.

Abstract: In a driving circuit for a liquid crystal display matrix, a source of a direct or low-frequency voltage is connected to drive the selected row and column electrodes, and a high frequency voltage is connected to the driving circuit so that the high frequency potential is effective in combination with the low frequency or direct voltage at non-frequency voltage is effective at the selected crossovers. The high frequency voltage suppresses changes in the optical properties of the liquid crystal at the non-selected crossovers.

Abstract: A discharge lamp lighting device combines one or more discharge lamps and a backswing booster including essentially a power source circuit having a power source connected in series with a ballast and a high voltage generating circuit having an oscillation capacitor and a series circuit of a nonlinear inductor and a switching semiconductor. The supply voltage for the discharge lamp from the power source circuit is established to the extent permissible by the lower limit for sustaining an arc discharge of the lamp so that the terminal voltage of the ballast in the lamp operation is maintained as low as possible. The preferred backswing booster is of small size and an impedance circuit having a capacitor either with or without a bias coil is added to the high voltage generating circuit to produce a momentary high voltage.

Abstract: A flying object, such as a missile is protected against shock loads, especially loads effective in the longitudinal direction, by a shock absorber which is secured to the muzzle end of a launching tube by an adapter ring. The absorber itself is a pipe section of relatively soft elastic material having embedded therein a helical insert of relatively hard elastic material.

Abstract: It is the purpose of the present discharge lamp lighting system to provide reignition energy to a discharge lamp in each half cycle of the a.c. power source. The discharge lamp is connected to a conventional a.c. power source through ballast means and an oscillation booster circuit, which provides an intermittent oscillation output for the reignition operation of the discharge lamp. The operation period of the intermittent oscillation output is so controlled that the reignition operation period is included in each half cycle of the discharge lamp current. The lamp voltage and source voltage are established to agree as much as possible with each other for minimizing the terminal voltage of the ballast means, whereby a compact and economical device with a small inductance ballast means is achieved.

Abstract: A vertical boring and turning mill has a base and a rotatable table supported on the base as well as an upright frame carrying a horizontal cross beam, which in turn carries a plurality of horizontally adjustable slides or carriages. Each slide or carriage supports a vertically adjustable tool slide or support. The vertical carriages of at least two tool supports are coupled to each other in such a manner that at least two supports have a common drive and control mechanism, whereby substantial savings are achieved.

Abstract: A tunnel construction made of tubbings forming a lining or casing for a tunnel includes a plurality of contact points between adjacent tubbings. These contact points comprise adhesive material acting to connect adjacent tubbings to each other at predetermined points. The contact points are distributed around the circumference of the tubbing rings at predetermined locations which depend on the type of the tubbing used and also on the points of pressure application by the driving shield of a tunneling or heading machine. The present tubbings have recesses in their surface facing into the tunnel whereby the recesses have a substantially trapezoidal shape to form three ribs extending substantially in the direction of the longitudinal tunnel axes.

Abstract: A gas-discharging passage for a storage battery is adapted to discharge the gas which is produced inside the storage battery through a cylindrical body. The gas discharging passage is provided directly in the cover of the storage battery, or in the plug for electrolyte hole of the storage battery. A plurality of tongue-like pieces which are molded integrally with the cylindrical body are projected inwardly and inclined downwardly on the inner peripheral wall of the cylindrical body, whose axis is directed vertically. Thus, the passage shape formed inside the cylindrical body is adapted to advantageously prevent electrolyte from remaining inside the cylindrical body and from leaking through the cylindrical body.

Abstract: An indicating device for a storage battery comprising: a bar-like body which is transparent, inserted through and held on the upper wall of the electrolytic vessel of a storage battery, has a pointed lower end and is immersed in the electrolyte in the storage battery; and an indicating member which is disposed in the electrolyte near the lower end of the bar-like body, rotatable around a horizontal axis, has its specific gravity correlated with that of the electrolyte and has its center of buoyancy deviated from the rotative axis thereof so that the indicating member is rotated as it sinks and floats according as the specific gravity of the electrolyte varies, the arrangement being such that when the indicating member is seen through the transparent bar-like body from above the storage battery, the indicating member, for example, selectively moves into and out of a visible range so that the manner of indication is changed according to the specific gravity of the electrolyte.

Abstract: The pressure drop in a pressurized cabin, for example, in an aircraft cab is delayed following the occurrence of an emergency resulting from a door failure, by a mat which has a low air permeability. Such a mat is mechanically secured to the cabin structure to cover the openings in the cabin or body on the inside thereof, for example, to cover a door opening in flight. The air permeability of these mats is such that a pressure equalization is delayed by a time safe enough for humans, whereby the pressure equalization rate does not exceed approximately 2.4 PSI/sec.

Abstract: In a centrifuge, the centrifuge baskets may be conical or cylindrical, and the inner surface of the basket is provided with grooves or a mesh for forming flow-off paths. A screen is supported inside of a centrifugal drum, basket, or cage. The screen may rest on the inner surface of the drum, cage, or basket, or support members may be interposed between the screen, and the drum, basket or cage. In any event, passageways are provided between the screen and the rotating centrifugal member such as a drum, basket or cage. The radially outer surfaces of the screen are at least partially roughened, and corresponding contact areas of the supporting surface are also roughened, in order to increase the friction at said contact areas.

Abstract: This axle suspension system for a vehicle includes a stabilizer connecting the body and axle. The stabilizer is a generally rectangular frame made up of two opposed, U-shaped frame elements the distal ends of the limbs of which are connected together by flanges, preferably at the longitudinal central plane of the vehicle. One transversely extending side of the frame is pivotally connected to the axle, and the other is pivotally connected to the body and force transmitting elements connect the axle and one of said flanges and the body and the other of the flanges.

Abstract: A milling head having a shaft for attachment to a machine tool, and at least one cutting insert or bit, characterized in that the cutting insert is supported in a tiltable or swivelable holder having a swivel axis extending perpendicularly to the axis of rotation of the milling head. Stopping means is situated between the milling head and the holder, against which the holder rests in its working position. A cam plate is held in a stationary position such that the cam plate cooperates with the holder to tilt or swivel the latter along a portion of its arcuate movement thereby lifting the cutting insert off the surface to be machined. The stopping means may include travel limit elements that comprise a bore in the holder and a protruding pin which engages with the bore. Biasing means is provided in the form of a spring arranged so that it tends to bias the holder into its working position.

Abstract: The present seating furniture comprises chairs, especially constructed for multi-purpose group seating arrangements for example, in auditoriums, assembly halls, convention halls, lecture rooms and the like. The foldable seat proper is secured to the side walls of a shell shaped center part which in turn is supported by a base to which the shell shaped center part is removably connected. The shell shaped center part has a rear wall, the upper end of which is permanently connected to head rest means, if such head rest means are employed. Further, the side walls may be provided with telescoping means so that the side walls and the seat along with the corresponding portion of the back rest may be extended or retracted. In a modification one chair may be converted into a desk for the chair behind the converted chair.

Abstract: The present drying drum includes a roller supported drum jacket which is connected at one end thereof to a drive shaft by means of radially extending arms whereby the drive shaft extends coaxially with the rotational axis of the drum jacket. The drive means proper are guided relative to said drive shaft by guide means forming part of the drive shaft itself or either by a bearing surface forming part of a spur gear connected to the drive shaft. The drive means are further connected through a guide rod with an abutment means for taking up the drive reaction.

Abstract: A cam actuated brake adjuster reduces automatically the clearance between the brake lining and the brake drum which exists when the brakes are released, if this clearance exceeds a predetermined value. A one-way drive mechanism which adjusts the angular position of a camshaft with the aid of a worm gear is actuated by an adjusting rod assembly, which yields to a given adjusting force corresponding to a given brake force, to prevent an excessive adjustment which might result from a drum distortion caused by the application of a great braking force.

Abstract: A vacuum packaging machine is provided in which the working stations are mounted on a movable rod, this rod is provided with means to move the working stations back and forth and simultaneously drive the web feed arrangement thereby achieving an almost continuous flow of the web at the necessary rate.

Abstract: A thermal fuse comprises an electrically and thermally conductive housing hermetically sealing switch parts of a fusible temperature-sensitive pellet, metallic plates, compression springs and a slidable resilient contact member. The contact member has a center contact portion at its bottom base and a peripheral contact portion with a plurality of tongues extending from the bottom base. The contact member of resilient conductive material is shaped to form a portion sloping over the bottom base and to form peripheral tongues extending relative to the flat surface of the assembled metallic plate when no external force is applied.

Abstract: A rolling container assembly has a braking and locking system including a pair of locking levers on shafts positioned to engage opposite sides of a fixed anchor. The locking levers are releasable by separate control levers. Braking spikes are arranged on a pair of further shafts, and are inclined downwardly from their respective shafts and toward the center of the container. Lost motion rods intercouple the locking lever with the braking spikes, so that the braking spikes may be rotated to vertical positions independently of the respective locking levers. The shafts through which the braking spikes are connected are also coupled by a lever, whereby the braking spikes simultaneously rotate in opposite senses.