Abstract: An apparatus for measuring the carbon dioxide content of fluids, especially beer, is described in which there are two pistons disposed on either side of an expansion chamber, the pistons being in cylinders of different displacement volumes, the pistons being displaceable axially together to effect expansion whereby equilibrium between carbon dioxide in gas and in fluid is established thereby permitting, via pressure measurements, a determination of the carbon dioxide content of a fluid sample.

Abstract: Automatic octane measurements are made very rapidly with standard test engine using an all-electronic control that automatically lowers the fuel-air ratio to bring the knock intensity below standard, then automatically adjusts the compression to bring the knock intensity to standard, then intermittently increases the fuel-air ratio, after the first or second intermittent increase permits automatic compensatory compression changes only in the decreasing direction to compensate for departures from standard knock intensity and conducts these compensatory compression changes at a rate too slow for adequate compensation if the fuel-air ratio increase causes a substantial increase in knock intensity, and then indicating the compression ratio reading after the knock intensity remains standard during two to four successive fuel-air ratio increases.

Abstract: A hydrostatic testing apparatus for capping an open end of a pipe, tube or cylinder is disclosed.A seal is provided to facilitate a fluid-tight seal between the pipe and the body. The seal has relatively long lips which facilitate a sealing engagement upon dirty or rough pipe surfaces. The seal is pre-stressed by lugs to sealingly engage the pipe under low pressure conditions.Adaptors, a centralizer having replaceable cam pieces, and replaceable jaw tooth segments facilitate the testing of a variety of pipe sizes and shapes with a single apparatus. An air purge valve is provided, in cooperation with passageways, to facilitate the expungement of air and gas from the interior of the body and pipe.A jaw design is disclosed which permits the side of the jaw to evenly grip the pipe by providing a pivotal attachment between the jaw and translator that is parallel to the axis of the pipe.

Abstract: A force transducer comprises a block of material which is formed with a generally U-shaped or pi-shaped throughaperture 24 and a generally T-shaped throughaperture 26 in such a way as to form two loading members 10, 12 coupled together by first flexure elements 14, 16 which constrain the loading members to move in a predetermined direction under load and a second pair of flexure elements 18, 20 united by a connecting portion 22. In use, one loading member is connected to a fixture and the other is connected to a force receiver so that when one loading member is displaced relative to the other in said predetermined direction, the second flexure strips 18, 20 undergo a lateral deflection which is a measure of the applied force. This arrangement is particularly suitable for use with strain gauges as the flexures 18, 20 are subjected to a substantially uniform stress along their lengths when loaded.

Abstract: A gas flow measuring tube is provided in a duct through which gas to be measured is flown. In this gas flow measuring tube there are placed an electric heater and first and second temperature dependent resistors which are formed of resistance wires stretched across a plurality of respective insulator frames. A measuring circuit is provided for controlling electric power to be supplied to the electric heater in accordance with the resistance change of the temperature dependent resistors, and thereby measuring the amount of the flow of gas to be measured. The measured values are corrected in accordance with the temperature of the insulator frames.

Abstract: A method and apparatus for measuring the level of containerized or free standing semi-solid material is disclosed. A substantially smooth uniform cable is suspended above and into the semi-solid material. A predetermined amount of slack is introduced into the cable. The slackened portion of the cable above the level of the semi-solid material is coupled to a weighing apparatus. The weighing apparatus weighs the slackened portion of the cable, the weight of such a portion being related to the amount of cable above the level of the material and thus an indication of the level of the material. Subsequent to a measurement, the cable is raised for uncoupling the cable from the weighing apparatus.

Abstract: A temperature sensor for measuring the temperature of a part of an automobile, which sensor comprises in combination a clip and an electric heat-sensitive device, such as preferably a thermistor. The clip, which attaches the sensor to the automobile part, includes a first and a second jaw. These jaws are movable between a first and a second position. In the first position, the jaws are remote from each other, whereas in the second position they are positioned close to each other. In the first jaw, there is provided a recess adjacent to the second jaw. A heat-sensitive device is retained within this recess by a heat-conductive material. The automobile part, the temperature of which is to be determined, is enclosed between the jaws when the clip is in its second position.

Abstract: A temperature or pressure gauge capable of providing a magnified output indication of a respective sensed temperature or pressure of a fluid. Overlapping surfaces are movable relative to one another in response to sensed changes in temperature or pressure of a fluid. Each surface is provided with an aperture, a light controlling edge, or an indicator which overlaps and intersects at an acute angle a respective aperture, edge or indicator on the other surface. Rotary motion or other motion induced by the sensing element is translated into linear movement of the point of intersection of the two apertures, edges or indicators, the linear movement being greater in magnitude than the movement of the sensing element. This gauge is suitable for strip chart recording, for visual observation or for electrooptical reading.

Abstract: PCT No. PCT/SE79/00088 Sec. 371 Date Dec. 6, 1979 Sec. 102(e) Date Dec. 6, 1979 PCT Filed Apr. 11, 1979 PCT Pub. No. WO79/00934 PCT Pub. Date Nov. 15, 1979An apparatus for use in the analysis of flowing media, and in particular for the analysis of pulp-flows taken from different locations in at least one flotation plant is illustrated in FIG. 1. The apparatus comprises analysis cells (22) through each of which a respective one of said media is caused to flow. The cells are arranged to be brought one at a time into a respective position for co-operation with an analysis instrument (20), by a movable carrying means. The movable carrier means (21) is rotatable about a substantially vertical axis (24) and carries the cells (22) adjacent to one another along a substantially horizontal circular-arcuate line which has its center on said axis. The movable carrying means are made of an elastomeric material.

Abstract: A method of obtaining a substantially anaerobic sample from a landfill comprising providing a bore hole which opens at the surface of the landfill, substantially sealing off atmospheric air from a zone which includes at least a region of the bore hole to define an essentially anaerobic zone. Refuse from the anaerobic zone within the bore hole is loaded into a sample container in the anaerobic zone. The sample container is sealed within the anaerobic zone and then removed from the anaerobic zone. The sample can be used for various tests, including a determination of the rate of landfill gas generation by the sample.

Abstract: An array of sonic transducers, useful for medical ultrasonic imaging, has individual sections thereof separately coupled for forming separate beams of sonic energy which converge, respectively, to separate foci along a common axis of the beams. The ratio of the diameter of the radiating aperture of the array relative to a wavelength of the sonic energy is chosen to provide a moderate degree of focusing so that the depth of field at one focus blends with the depth of field of the next focus. Thereby, there is formed a continuous region of substantially uniform intensity of sonic radiation along the common beam axis. Circuitry is provided for selecting one or more specific foci dependent on the bounds of a selected region to be insonified.

Abstract: Method and apparatus for high-sensitivity optoacoustic (OA) spectroscopy of condensed matter in thin layer form. The layer to be investigated is to be in intimate contact with a solid substrate that is essentially transparent to the probe radiation, and that is capable of transmitting ultrasonic vibrations. Intermittent probe radiation, focused to a diameter typically 10.sup.-3 -1 cm when incident on the layer, cause local heating and dimensional change in the irradiated region of the layer. The dimensional change of that region causes deformation of the adjacent substrate material, the irradiated layer region thereby becoming a source of ultrasonic waves that are spreading out in the substrate from the source region, and which can be observed with appropriate detection means at a location remote from the source.

Abstract: A method of and apparatus for accurately adjusting a hearing aid. First a wide-band reference signal of relatively low sound level, e.g. 40 to 50 dB, is reproduced via a loudspeaker. The gain of the hearing aid is adjusted so that the person wearing it can just hear this reference signal. Then, in addition to the reference signal, a periodically recurring narrow-band signal having a duration of approximately 150 msecs is reproduced and the range of the optimum sound-level of speech is determined for different central frequencies of this narrow-band signal. The range thus determined is compared with the range of optimum sound-level of speech for persons with normal hearing and subsequently the setting of the hearing aid is corrected so that the sound level experienced as a pleasing sound level of speech by the user of the hearing aid falls within the sound-level range which is pleasing to persons with normal hearing.

Abstract: The disclosed torsional vibration monitoring apparatus estimates torsional vibration at arbitrary positions in a shaft system, such as in a turbine generator. Detectors detect torsional vibrations produced at fixed positions of the rotating shaft system and the detected vibrations are separated into modal vibrations so that subtractors and matrix operators can obtain up to n vibration mode components from the modal vibrations and the torsional vibrations detected. First modal vibration operators obtain modal vibrations higher than the (n+1)th modal vibrations at the arbitrary positions of the rotating shaft system from the detected torsional vibrations, second modal operators obtain up to the n-th modal vibrations at the arbitrary positions from the vibration mode components and adders add the respective modal vibrations obtained by the first and second modal operators.

Abstract: A camshaft post assembly is mounted onto an axial end of a camshaft and axially extends therebeyond. The camshaft post has an outwardly extending rim which has a sprocket ring mounted thereon and an eccentric pilot surface with a fuel pump cam mounted thereon and at its outer axially end a helical distributor gear frictionally locked thereon. The cam post has internal passages for lubricant which allows an oil pump to pumpoil therethrough which passes the oil through the camshaft, through the cam post, and through outlets which centrifugally spray oil onto the sprocket ring and distributor gear.

Abstract: A stepless variable stroke drive particularly suitable for a bicycle transmission has a crank driven input element comprising a carrier housing journaled for rotation on a spindle. Mounted within the carrier, journaled on individual axles, radially spaced to the spindle, are four planet gears which engage an output sun gear. Recessed into one side of each planet gear is a concentric channel whose outer circumference is constructed with ratchet teeth and whose inner circumference journals a crank ring having pawls for engaging the ratchet teeth. The ring also has a follower which engages a cylindrical cam channel fixed on and adjustable to various eccentricities relative to the spindle. As the carrier housing rotates, the crank ring follower engages the cam channel causing the crank rings to angularly oscillate at an amplitude proportional to the cam channel eccentricity.

Abstract: A gear tooth form is disclosed that maximizes the profile (transverse) contact ratio for coplanar axis gearing. As the tooth form allows teeth two or three times as fine as those of conventional involute gearing to be used without loss of torque capacity, the face (axial) contact ratio for helical or spiral bevel gearing is also maximized. The total contact ratio (profile plus face contact ratios) is therefore maximized, and the torque load is divided over the maximum number of teeth. This minimizes the transmission error, which in turn minimizes operating noise and vibration. The gearing employs a minimum pressure angle and a path of contact that includes a curved portion.

Abstract: PCT No. PCT/US79/01056 Sec. 371 Date Dec. 5, 1979 Sec. 102(e) Date Dec. 5, 1979 PCT Filed Dec. 5, 1979A boot seal (48) for sealing a swivel joint (60) having two open sides (70,72) pivotally connecting a first member (50) to a second member (42) extending transversely therethrough includes a body portion (76) enclosing the joint (60), apertures (86) in the body portion (76) for receiving the second member (42), and a flexible bellows portion (82) extending along a portion (52) of the first member (50) in sealing engagement therewith to accommodate full pivotal movement of the joint (60).

Abstract: A steering arrangement for a bicycle having a steering shaft, said arrangement comprising a steering wheel, a generally "U" shaped member extending from said wheel for the securing of the wheel to said shaft and a clamp to adjustably clamp said "U" shaped member to said shaft so that said steering wheel may be adjusted relative to a rider of the cycle.

Abstract: The method of manufacturing such drill head by embedding the shank portions of hard, wear-resistant cutting elements in a mold containing metal powder, cold isostatically compacting the powder and shank portions to form the core part of the drill head, and hot isostatically compressing this core part to completely densify same.

Abstract: The invention pertains to an apparatus for extracting a cork from a bottle comprising a cork-engaging member, including a corkscrew, and a holder for aligning and guiding the corkscrew, via its own diameter, with respect to the bottle. The cork-engaging member is completely removable from the holder for independent use, and to permit the corkscrew point to be used to sever the metal foil, which covers the bottle top, and both the holder and cork engaging member to be more easily cleaned. The holder includes a plurality of longitudinally extending circumferentially spaced, radially deflectable gripping elements connected to and spaced downwardly from a guide which receives the corkscrew, and are all approximately equally resiliently biased to a normal unflexed radial position. One embodiment is capable of two alternative modes of operation. The corkscrew itself is improved by the provision of an outer layer of friction reducing material.

Abstract: A ratcheting open-ended wrench includes a fixed jaw and a pivoted jaw arranged in relationship to each other to define an in-line insertion opening aligned with the operating handle portion in accordance with a conventional open-ended wrench. The fixed and pivoted jaws are formed with cooperating notched faces creating a multiple pointed configuration equivalent to a socket or closed-end wrench for mating with a hex-type head in different angular orientation. The fixed and pivoted jaw include a force transmission arm and recess such that the turning force is transmitted from the fixed jaw directly to the pivoted jaw. The pivoted jaw has a pivoted connection to one side of the handle and extends across the end of the handle and then outwardly to locate the fulcrum permitting application of closing forces in one direction and the ratcheting release on the reverse stroke.

Abstract: A ratchet wrench attached to an offset vertically elongated handle with the control for operating the ratchet on the upper extremity of the handle. This wrench finds important use in loosening and tightening the clamp nut of a distributor when adjusting the timing on an internal combustion engine.

Abstract: The invention relates to a method for the continuous path control of a machine tool, where either the tool or the workpiece is moved along a curve corresponding to the contour for the purpose of producing a given workpiece contour. The shape of the contour is approximated by a plurality of individual points and interpolation is carried out between the points. After each interpolation section, the set point is scanned, a set point/actual value comparison is carried out and a corresponding correction value is put in for the actuating element. To reduce the required effort at good accuracy, set point scanning is carried out after a given path section instead of a given time interval.

Abstract: Method and apparatus for truing metal wheels of railroad locomotives and other rolling stock without removal of the wheels uses automatically controlled mechanism carrying a cutting tool and disposed in an open pit below the wheels which are lifted from removable rail sections for the truing operation. In preferred embodiments of the invention, the wheel to be trued is independently driven and the cutting tool is mounted on a powered cross slide which is controlled by a conventional tracer control unit which causes the cutting tool to remove metal from the wheel to form a wheel contour corresponding to a preestablished pattern.

Abstract: The present invention relates to a tool machine of a known type in which a crankshaft is machined by a rotary annular tool having internal cutting edges located on at least one circle through which the crankshaft extends. The crankshaft is held by means mounted on the bed of the machine in stationary condition. A slide on this bed movable in a direction parallel to the crankshaft carries a tool unit which is movable on the slide to a cutting position in which said circle is located in a tangential relationship to the pin of the crankshaft being cut and to a loading and unloading position in which said circle is brought to co-axial relationship with the main axis of the crankshaft. When the tool unit is in this position, it may be moved by the slide to such a position close to one of the columns on the bed that the tool surrounds a substantially cylindrical projection on the column carrying the end of the crankshaft.

Abstract: A number of pairs of frozen fish slabs are arranged vertically in an equal number of laterally spaced vertical tubes or chutes constituting a magazine, each tube or chute having a partition dividing it into two open-ended compartments with a slab being slidably contained in each compartment. A cutter assembly comprising a blade carrier and a vertically adjustable table move as a unit at an acute angle beneath the magazine. The carrier has fixedly mounted at another acute angle thereon a plurality of flat blades equal in number to the number of tubes or chutes, each blade having a knife edge extending along opposite sides thereof so that when the cutter assembly is advanced in one direction the lower end of one of the slabs of each pair of slabs is severed and when retracted the lower end of the other of the slabs of each pair is severed to form individual fish sticks having a thickness determined by the distance the table is spaced below the plane in which the blades move.

Abstract: Apparatus for cutting to length the connecting wires of electrical components (such as resistors, capacitors, transistors or diodes) comprises a cutting device situated below a component guide which consists of a slideway defining a guide slot through which the connecting wires project downwardly. The cutting device comprises two shearing wheels which are arranged with horizontal faces thereof parallel and abutting one another in a region in which they overlap, the forward point of intersection of peripheral cutting edges of the wheel (the point at which cutting of the connecting wires commences) being situated below the guide slot. At least one of the wheels is driven and this has serrations at its periphery which are large in relation to the diameter of the connecting wires to be cut. The non-driven wheel is preferably of truncated conical shape widening towards the other wheel.

Abstract: A dispenser for sheets of web material, such as paper towels, from a supply roll, including a housing, means for holding a supply roll of the web material, and means for separating a sheet of the web from the supply roll operable in response to a user pulling the sheet from the housing and arranged to present at least a portion of the leading edge of the web ready for a user to seize for the dispensing of a further sheet as a direct result of the user pulling the previous sheet from the dispenser.

Abstract: A cable separator including a pair of slotted rolls that define uniformly spaced apart slitting or shearing sites which are spaced from one another by a distance corresponding to the conductor spacing of a flat cable. A guiding structure at the inlet of the slitting sites for guiding the flat cable thereinto at a proper transverse position to assure that slitting takes place between adjacent conductors. The guiding structure has a plurality of longitudinally extending spring loaded ribs that are spaced from one another by an integral multiple of the interconductor spacing of the cable. A pivotal clamping frame mounted at the inlet of the guiding structure and a mechanism for adjusting the clamping frame to adjust the distance over which the cable conductors are separated by the apparatus.

Abstract: The invention is directed to a power tool apparatus such as a table saw which includes a housing having a table top with an appropriate opening for a motor driven tool. Pivotally mounted within the housing is an assembly which in the disclosed embodiment includes a frame having a subassembly pivotally mounted therein. A subassembly includes the tool, such as a saw blade, and the means for driving same. A first control includes a lever connected to the subassembly for pivoting same. The pivotal movement effected by the lever allows for quick and coarse setting of the tool at a desired elevation with respect to the tabletop. The control lever further includes a locking arrangement disposed thereon which is manipulatable by the same hand used to coarsely set the tool elevation. The locking arrangement secures the lever to the frame at the desired coarse setting.

Abstract: A plurality of cruciform cutter members are arranged on a drum to define transverse and circumferential lines along which dough sheet scoring is effected. The members are formed with dough scoring edges along each of the arms thereof and a cutting element at the center to cut a piece from the dough sheet at each intersection of the scoring lines. Air passageways leading to the cutting elements are alternately connected to a vacuum source for removing the cut dough piece from the dough sheet and to a pressure source for removing to dough piece from the element.

Abstract: A musical chord system includes a pedal console comprising a plurality of foot-actuated pedal switches, a chord selection switch console comprising a plurality of chord selection switches associated with said pedal switches, and diode matrix logic means interconnecting the chord selection switches with the tone generating circuitry of a conventional electronic musical instrument such as an electric organ whereby chords are sounded upon depression of the foot pedals. By adjustment of the corresponding chord selection switch, each foot pedal can be set to produce any desired one of a multiplicity of possible chords. Switches are also provided to permit the chords to be sounded on different octaves and keyboards or combinations thereof. A priority interconnect circuit prevents more than one chord from being played when two pedals are simultaneously depressed. A lower musical keyboard sustaining circuit permits the upper manual keyboard to be pulsed with alternating partial and full depression of a pedal.

Abstract: An electronic keyboard instrument generates signals of frequencies respectively corresponding to keys by depressing the keys of a keyboard from a signal source, and reproduces a musical note corresponding to the generated signal. The frequency spectrum of an external signal is detected and used to control the frequency spectrum of the generated signal to cause the frequency spectrum of the generated signal to approximate that of the external signal.

Abstract: A stop tab mechanism for an particularly electronic organ of the type having a capture combination system. The stop tab mechanism includes an elongated stop tab having a front portion, a central portion, and a rear portion, a mounting bracket for the stop tab, spaced apart front and rear rests secured to the mounting bracket, guide means mounting the central portion of the stop tab for pivotal movement relative to the rests, including a spring urging the central portion of the stop tab into contact with the front and rear rests, and switch means operatively connected to the rear portion of the stop tab.

Abstract: A pitch adjuster for a valved brass instrument having a tuning slide crook and a third valve slide crook enables play in the just intonation scale and includes a main push rod attached to the tuning slide crook, a finger operator attached to the third valve slide crook and slidably mounted on the main push rod, a bias spring retaining the finger operator in a normal position, a trigger operator and a detent assembly which provides for stopped flat and sharp positions. The trigger operator retracts the main push rod to retract the main tuning slide crook and sharpen the pitch of the note being played. The finger operator extends the main push rod and thereby extends the tuning slide crook and third valve slide crook to flatten the pitch of the note being played. The finger operator may be moved beyond the stopped position, by sliding along the main push rod and compressing the bias spring, and further extend the third valve slide crook alone.

Abstract: Device for tightening a coiled covering wire of a composite piano string relative to the core wire thereof comprises a spring-loaded operating shaft axially movably encased within an elongated cylindrical main body, the shaft being provided with an outwardly exposable end portion adapted for detachable engagement with the top of a frame pin so that the composite piano string can be transferred to the shaft for twisting. Adjustment of the winding strength of the covering wire relative to the core wire is greatly simplified and stabilized.

Abstract: The invention relates to a one-piece plastics fastener for positively fastening an element to a support, permitting removal of such element while the fastener is self-retained thereon.The subject fastener of this invention is so devised as to enable it if necessary to be mounted on the element to be fastened prior to mounting of the two together on the support, which is important in the event of assembly-line operations.

Abstract: A support assembly for a hand gun having a rifle-like unit. Sighting means is provided for use in assembled relation with the support assembly, and mounting means is utilized for removably securing the sighting means relative to the upper end so as to obtain adjustment thereof. Coupling means is associated with the support assembly and is adapted for receiving a hand gun in removably coupled relation thereto adjacent to the front end. Holding means is provided for maintaining the barrel of the hand gun in fixed position during use thereof, and the holding means includes a vertically extending channel having a resilient arm associated therewith for maintaining the barrel in removably positioned confinement within the channel.

Abstract: An attachment for a semiautomatic weapon constructed with a trigger and trigger guard is disclosed, and the preferred embodiment incorporates a clamp means adapted to be releasably attached to the trigger guard, a rotor means pivotally supported by said clamp means for rotation about an axis to drive a movable striker means in a reciprocating fashion against the trigger enclosed by the trigger guard. A laterally extending handle equipped with a knob at the outer end is rotatable to turn a shaft which, in turn, rotates the rotor.

Abstract: A simplified fail-fixed electrohydraulic servovalve for operating with a source of fluid under pressure, and a piston translatably disposed within a bore. The piston has a rod side face area which is less than its head side face area and translates in a first direction for electrical input signals above a first predetermined percent of a maximum rated input signal. At a second percent of the rated input signal, determined by the ratio of the piston rod side face area to the piston head side face area, the piston position is fixed. For electrical input signals greater than the second percent of the rated input signal the piston translates in the second direction. Any input signal below the first percent causes the piston to be fixed in place.

Abstract: A programmed valve system for positioning control having a first two stage valve assembly operable for raising a load and a second two stage valve assembly for lowering the load. Each of the second stages has a poppet with a parabolic contour which is dimensioned with orifice parameters to provide substantially linear flow rate change for minimized shock when one of the second stage poppets closes and the other opens. In the raise assembly, the pilot stage outlet orifice has a cross-sectional area substantially larger than that of the inlet orifice so that the second stage poppet opens much more rapidly than the closing thereof thereby to minimize overshoot when the pilot stage is actuated to the open position.

Abstract: A closed center programmed valve system having a load sense fluid source for control of the raising and lowering of load means by a raise and a lower normally closed two stage valve assembly. Each of the second stages of the valve assemblies has a poppet with a parabolic control which is dimensioned to provide substantially linear flow rate change for minimized shock when the respective valve is actuated to the valve closed state. The load sense for the load means is taken from the outlet of the raise second stage without the requirement of a separate actuated valve or land with a load sense signal being applied to the fluid source during the time the raise valve assembly is actuated to the valve open state.

Abstract: An improved power steering valve has a sleeve which circumscribes an inner valve member. An end mill or other rotary cutting tool is utilized to form axially extending grooves inside the valve sleeve. When the end mill is forming the grooves inside the valve sleeve, the axis of rotation of the end mill extends at an acute angle relative to the central axis of the valve sleeve. This results in a groove being formed with axially sloping end surfaces. In order to tend to maximize the compactness of the construction of the valve sleeve, fluid passages or holes are drilled along a sloping path from annular grooves on the outside of the valve sleeve to the sloping end surfaces of the axial grooves inside the valve sleeve. In addition, the compact construction of the valve sleeve is further promoted by forming some of the annular grooves with sloping bottom surfaces so that these grooves are relatively deep.

Abstract: The present invention provides a method and apparatus for controlling the rate of flow of fluid in a high (e.g. 100 kg/sq cm) pressure hydraulic circuit such as is found in pneumatic piston and cylinder arrangements having hydraulic damping and which may be used to control the feed rate of a cutting tool. Control is achieved by incorporating into the fluid circuit, upstream of the flow control orifice, a pressure reducing valve designed to provide a controlled low (e.g. 7 kg/sq cm) pressure independently of changes in applied pressure or demanded flow rates and which further automatically clears itself of any silt deposited thereon from the hydraulic fluid.

Abstract: A main frame carries a movable part for raising and lowering by means of a hydraulic cylinder, and a blocking member is selectively movable into a position between the piston rod end of the cylinder and a stop on the movable part for preventing accidental descent of the movable part.

Abstract: The invention relates to a method and an apparatus suitable for carrying out the method for opening, conveying and dividing tubular coverings which are lain flat, moist, empty and which have not been taken in, optionally on covering, filling and seaming machines.

Abstract: An interior ceiling type fan operated by a wind propelled squirrel cage rotor, rotatably mounted atop the roof of a structure, with an axially extending drive shaft therefrom extending downwardly through the roof of the structure, such as a building, trailer, etc., with the multi-bladed ceiling fan fixed to the distal end thereof within the inner area of the structure.

Abstract: A lighting fixture is disclosed. The lighting fixture comprises a top and side and end walls, means for supporting a light source in the fixture to emit light from a light-emitting side thereof, and conduit means operatively associated with the fixture so that a heat transfer fluid circulated therethrough is in heat transfer relationship with the fixture. The fixture has a path including at least one opening therein through which air can flow from the exterior on the light-emitting side to the interior, and to the exterior opposite the light-emitting side, and a damper movable between an open position and a closed position, and effective in the closed position, but ineffective in the open position, to prevent the flow of air from the interior of the fixture to the exterior opposite the light-emitting side.

Abstract: An air distributor has a connecting pipe and a baffle spaced from the mouth of this pipe while a crown of vanes is disposed between the baffle and the pipe mouth.