Abstract: A method for removing impurities from a mother liquor comprising a carboxylic acid, a metal catalyst, impurities by (a) evaporating the mother liquor comprising a carboxylic acid, the metal catalyst, impurities, water and a solvent in a first evaporator zone to produce a vapor stream and a concentrated mother liquor stream; (b) evaporating the concentrated mother liquor stream in a second evaporator zone to form a solvent rich stream and a super concentrated mother liquor stream; (c) separating organic impurities with a water-solvent solution from the super concentrated mother liquor in a solid-liquid separation zone to form an aqueous stream and a second aqueous stream; (d) mixing in a mixing zone water and optionally and extraction solvent with the aqueous stream and second aqueous stream to form an aqueous mixture; and (e) adding an extraction solvent to the aqueous mixture in an extraction zone to form an extract stream and a raffinate stream.

Abstract: The object of this process is to remove heavy metals and other elements and compounds from the Coal Combustion Products (CCP), ore, or other material by processing and recovery of the individual elements and/or compounds in a marketable form leaving an inert residual meeting the ground water quality standards.

Abstract: For the purpose of developing a device for sharpening multi-blade cutters, the invention proposes a device for sharpening multi-blade cutters having at least one motor and a holding table that is mobile relative thereto, the holding table comprising a holding member for clamping the cutter and a motor axis of the motor being disposed crosswise to the main shifting axis of the holding table.

Abstract: A composite utility blade and method of making such a blade involves butt joining a high speed or tool steel wire to a front edge of an alloy steel backing strip. The wire defines a predetermined cross-sectional shape that substantially corresponds to the cross-sectional shape of the cutting edge of the blade. The wire is electron beam welded to the backing strip to form a composite strip defining a first metal portion formed by the alloy steel backing strip, a second metal portion formed by the high speed or tool steel wire, and a weld region joining the first and second metal portions. The composite strip is then annealed, and the annealed strip is straightened to eliminate any camber therein. The annealed composite strip is then hardened such that the first metal portion defines a first surface hardness and the second metal portion defines a second surface hardness greater than the first surface hardness.

Abstract: A structural matrix drill bit body having different binder materials in different spatial locations as well as a method for forming the same, is provided. The different binder materials provide different functional properties to the different spatial locations of the drill bit body. The method for forming such a structural matrix body includes providing a matrix material within a mold, then infiltrating the matrix material with at least two binder materials which provide different functional properties in combination with the material. The arrangement is then heated and the heating process causes the different binder materials to infiltrate different spatial locations of the drill bit body.

Abstract: A structural improvement of a wine bottle opener which includes a syringe, a needle, a cap, a slide jacket and a bottle holder. The syringe is a hollow tube-shaped object, in which a high-pressured Freon can is inserted. The needle is attached to the front end of the syringe, and the cap is attached to the rear. The syringe is then put into the slide jacket, which is a pipe-shaped object with its upper inside perimeter roughly equal to the outside perimeter of the syringe. The slide jacket broadens at the bottom and the inner wall is threaded in order to screw onto the bottle holder. The top of the screw cap has a hole, through which the Freon can inside the syringe can be pressed. The needle is composed of a base and a tube, whereas the base is geometrically shaped and has threads on parts of its surface, enabling the use of hand tools to screw on or off the base from the syringe.

Abstract: A stopper removing device for removing a stopper from a container or similar, such as a wine bottle, comprises a body, stopper means to engage a stopper to be removed and handle means on the body which are selectively engageable with the stopper means to enable selective movement of the stopper means therewith relative to the body and thereby removal of the stopper.

Abstract: A pass through socket (12) and wrench (10) combination is disclosed wherein a first drive member (22a, 22b) is provided on the socket's exterior surface and a second drive member (24) is provided on the front side of the ratchet wrench's wheel (26) for engaging the socket's first drive member (22a, 22b) to enable the socket (12) to be driven with the wrench (10). The wrench's wheel (26) defines an axially aligned through hole (30) extending through the wheel (26) for receiving an insertable end of the socket (12) through the front side of the wheel (26). Socket retention means, preferably a snap ring mounted on the front side of the ratchet wheel (26), is also provided.

Abstract: A ratchet tool includes a head having a hole defined therethrough for an engaging member engaged therewith and a recess is defined in an inner periphery of the hole so as to receive a pawl therein. The pawl has a toothed surface which is engaged with a toothed outer periphery of the engaging member. Two operation levers are respectively connected to two opposite sides of the tool and a torsion spring is biased between respective one of the two operation levers and a side of the pawl.

Abstract: A tool handle with crawling traction for the human fist and support for the human body in a hands and knees crawling position and use of the fingers and thumb while holding the tool in a active position, ready for use. The tool handle also provides support and traction for the human body in horizontal, diagonal and vertical tool positions. The tool handle also provides multiple hand positions within a handle channel for instant hand repositioning without risk of losing control of the tool.

Abstract: There is provided a vertical lathe which, when machining gradually varying lens grooves in a mold for molding of a Fresnel lens, can change the angle of a cutting tool without positional displacement of the cutting tip, enabling high accuracy machining of the gradually varying lens grooves. The vertical lathe includes: a column; a rotary table for rotating a workpiece; a cantilevered cross rail supported by the column; a saddle movable in a horizontal direction along a guideway of the cross rail; a ram suspended from the saddle and movable vertically along a guideway of the saddle; and an inclined head mounted to the lower end of the ram and having an inclined swivel shaft for holding a cutting tool, wherein said swivel shaft is configured to swivel the cutting tool around a nose of the cutting tool as the center of swiveling.

Abstract: A hollowing system for a lathe having a tool rest. The hollowing system comprises a boring member, and a stabilization assembly. The boring member is adapted to support a tool such that at least one of the boring member and the tool extend past and engage the tool rest. The stabilization assembly is mountable adjacent to the lathe. The stabilization assembly supports the boring member such that the boring member extends generally parallel to a longitudinal axis of the lathe. The stabilization assembly has a vertical axis and a horizontal axis. The stabilization assembly is adapted to prevent downward movement of the tool when the stabilization assembly is mounted adjacent to the lathe and the tool is positioned on the tool rest. The stabilization assembly is provided with an articulation assembly.

Abstract: In cutting devices (10), in particular microtomes or ultramicrotomes (24), it is necessary to preset the specimen onto the knife (14). To improve the accuracy and reproducibility of this presetting operation, which is intended to ensure the quickest and most accurate possible positioning of the knife (14) relative to the specimen, a pivotable observation device (10), in particular a stereomicroscope, is provided. The observation device (10) is coupled to a pivoting device (28) that comprises a positioning device (29). The positioning device (29) is embodied in such a way that a positioning of the observation device (10) at a defined angle is possible.

Abstract: Apparatus for cutting an industrial-size roll of paper or other sheet material into two or more rolls. The apparatus includes a circular saw with a radius large enough to cut through such a roll in a single cut, leaving press-ready rolls that require no finish-trimming on the ends. The saw blade is mounted in a saw frame that travels along a carriage and positions the blade at any desired cutting position on the roll. The apparatus includes a support bed and load-bearing arms for supporting the weight of a large roll and keeping it in position during the cutting operation. Load/unload tables and a system of kicking cylinders guide the roll onto and off of the support bed. The saw frame is a tower that positions the saw blade above the roll at the desired cutting position, or a floor frame that positions the saw along side or beneath the roll at the desired cutting position. The apparatus further includes a finishing station for sanding the ends of cut rolls.

Abstract: A cutting equipment (34) for continuous forms (37) comprising an input moving device (53) for a continuous form, a loop forming device (54), a cutting feeding device (56) and a transversal cutting mechanism (58) for the form. The form (37) has side sprocket holes (41) and the cutting feeding device (56) includes intermediate pin feed tractors (91, 92) interposed between the loop forming device (54) and the transversal cutting mechanism (58) and provided for cooperating with the sprocket holes of the section of form (37) to be cut. The loop forming device includes a loop sensor (78) and the input moving device (53) causes the form to be entered at a mean velocity depending on the velocity of the intermediate pin feed tractors (91, 92) and on the state of the loop sensor.

Abstract: Apparatus for continuously cutting a web and removing trim strips therefrom, including a pair of circumferentially spaced knives supported on a cutting shaft, the shaft being rotationally mounted for cutting, in a cutting area, the web transverse to its direction of movement for forming trim strips, a cylinder mounted along the underside of the web for rotation about an axis which is generally perpendicular to the direction of the moving web, the cylinder having a hollow bore communicating with a low pressure source and an opening formed in the surface of the cylinder communicating with the bore for providing low pressure at the opening, the cylinder being rotated at a predetermined speed such that the opening is positioned in the cutting area immediately downstream of the knives each time a trim strip is cut from the web and the opening is rotated away from the cutting area immediately thereafter.

Abstract: The invention relates to a device for cutting food products, wherein separating sheets can be inserted simultaneously between the cut products. The transport system for delivering the paper web from which the separating sheets are formed comprises a station for transversal perforation of the paper web. The paper web is delivered to the cutting plane in such a way that the transversal perforation is located on the cutting plane during each paper separating operation.

Abstract: A hand-operated combination two-and-three-hole puncher for making holes in paper and other sheet materials is shown and described.

Abstract: A dual-purpose puncher combining two-hole and three-hole punch assemblies, is shown and described. The dual purpose puncher provides a duality of uses to the consumer without the necessity for readjustment.

Abstract: A circular saw machine having a saw blade (1) that is movably held for back and forth motion during the sawing process. A forward and a rearward saw blade guide (4, 5) ensure the stability of the saw blade (1) while sawing. The saw blade guides (4, 5) respectively have contact surfaces (6), which abut on the respective side surfaces of the saw blade (1). In order to operate the circular saw machine with different saw blade diameters, the forward saw blade guide (5) is removable from, or pivotable away from, the saw blade (1), and the saw blade itself is interchangeable. The radial positioning of the contact surfaces (6) of the saw blade guides (4, 5) is variable. This can be accomplished by interchanging the whole saw blade guide (5), but also in particular by a mounting (12), pivotable with respect to the saw blade guide (4, 5) and to which the contact surface (6) is fixed.

Abstract: A first layer of urethane sheet material is molded with a plurality of interlocking male and female fingers at opposing blanket ends and which fingers form a projection for insertion into an anvil channel. The fingers are arrayed in a plane beneath the plane of the first layer. The abutting ends of the blanket above the fingers form a seam of different configuration than the fingers, e.g., linear, to minimize formation of flat spots on the work surface. A fabric is bonded to the underside of the sheet material in one embodiment or a second layer of urethane is molded to blanket underside to form a major portion of the fingers and the projection in a second embodiment. The second layer has a relative durometer that is harder than the first layer, and a shrinkage smaller than that of the first layer to minimize the formation of edge curl and to support the first layer. The first layer outer work surface is roughened to mimic a shot peened surface.

Abstract: According to the invention there is provided a sawmill, the sawmill having first and second support frame 1 and 2, first and second rails 4 and 4, a first carriage 5, a second carriage 6, height adjustment drive means, and connection means; the sawmill being formed such that when it is in use it can be arranged with the first and second support frames 1 and 2 holding the first and second rails 3 and 4 in substantially horizontal elevated parallel relationship, the first carriage 5 being associated with the rails 3 and 4 and being capable of carrying a saw 7 longitudinally along such rails, the second carriage 6 being capable of moving the saw cross-ways with respect to the rails, the drive means being associated with the first support frame and the connection means connecting the drive means with the first rail and the second end frame; the sawmill being formed such that when it is in use the drive means can move the connection means to impart a lifting force at each of two opposite end parts of the first rai

Abstract: A vibration dampener for a circular saw blade includes a concave, disc-shaped dampening plate having a recessed area within the concavity and an annular shock absorber seated in the recessed area and projecting outwardly from the dampening plate. The dampening plate and shock absorber each abut a side of the saw blade, the abutment of the dampening plate being adjacent its perimeter. The dampener is radially weight-balanced about a transverse axis around which the dampener and blade rotate.

Abstract: An improved cutting fixture for heat-shrink film sleeve labeling machines comprised of a mounting frame disposed around the outer periphery of the center guide post in a sleeve labeling machine that secures a plurality of blade assemblies at equal intervals apart. Each blade assembly is positioned on a drive plate by means of an inserted eccentric shaft to maintain synchronous operation. The eccentric shafts of the blade assembly are driven into reciprocal rotation by a power structure, each eccentric shaft causing the blades at their lower extents to alternately project and retract for cutting heat-shrink film at a required travel and time to effectively shorten the period involved and thereby increase production efficiency. Each cutter shaft is restrained by a check plate and anchoring screws to prevent 360-degree free rotation, which not only results in safer blade replacement, but at the same time also prolongs the service life of the transmission and structural components.

Abstract: A replaceable cutter tooth for mounting to a saw blade has a concave front cutting surface extending from and between opposite kerf forming linear side edges, and from and between a radially inner curved edge, radially inner when mounted on a saw blade, and a radially outermost curved cutting edge. A groove extends in the radial direction from the radially inner curved edge to the radially outermost curved edge, generally medially between and substantially parallel to the side edges so as to reduce the surface area of a front face of the front cutting surface of the tooth for ease of re-sharpening in the field.

Abstract: The object of the invention is a single dual reed module, particularly for an instrument of the accordion type using two directions of air flow, characterized in that it comprises, for each note, a single fixed tongue carrier (32) with a window (34) and a tongue (36) connected to this tongue carrier and comprising at least one tongue (42) disposed in line with this window, as well as at least one associated movable element (44), disposed laterally relative to said tongue and adapted to take a first position for a first direction of air flow by providing an interstice between this movable element and the edge of the tongue such that this blade vibrates to emit said note in this first direction of air flow, and a second position symmetrical to the first position relative to the plane of the tongue for the second direction of air flow, by also providing an interstice such that the tongue vibrates to emit the same note in this second direction of air flow.

Abstract: In one embodiment, an ocarina comprises a sound chamber having a plurality of apertures that facilitate airflow through the sound chamber to produce a tone and an extension in the form of a recess that extends the sound chamber. The recess is disposed at an inner surface of the sound chamber such that at least one tonehole is in register with the recess. In another embodiment, an ocarina has a body in which is disposed a plurality of apertures. The apertures, namely, a windway, a fipple window, and toneholes, facilitate airflow through the body. The body is defined by at least one wall, an adjacent surface (e.g., a bottom), and a cover. The wall, the surface, and the cover cooperate to form a sound chamber. An inner surface of the wall of the sound chamber includes an extension formed by a recess that is positioned adjacent to the cover. At least one of the toneholes is in register with the recess.

Abstract: A drumstick having a tip of synthetic material, the tip having a plurality of substantially circumferential grooves. A drumstick having a handle portion with a cylindrical shaft and a striking tip extending from one end of the shaft, the striking tip having a substantially spherical conformal cap of synthetic material, the cap having a plurality of substantially circumferential grooves that are disposed in space substantially parallel to one another and substantially equidistantly spaced. The tip of synthetic material may be made from graphite, ceramics, or plastics, preferably nylon.

Abstract: A musical teaching device has a carriage to be placed in juxtaposition with a piano keyboard. The carriage has a pair of gloves slidably attached to move along the length of the carriage. The fingers of the gloves include signaling devices to indicate proper movement. The carriage and gloves are connected to a controller that commands proper hand positioning and finger movement to play a musical score loaded in the controller. The controller is powered by a computer program.

Abstract: A method of creating a music file comprising a plurality of tracks to be played simultaneously when the music file is played. The method includes creating a main melody track by selecting a respective pitch and duration of a plurality of notes, selecting a style of accompaniment music, retrieving accompaniment tracks for the selected style of accompaniment music from a memory, and combining the main melody track and the accompaniment tracks to create the music file.

Abstract: An electric guitar facilitates isolating principles of making music such that an individual can learn one aspect at a time of playing the guitar and of playing music and can, to match the skill level of the player, progressively require more aspects to be mastered in order to play the guitar. The guitar includes one mode which requires only that the player strum the strings, includes a second mode which requires the player to play the strings and depress buttons, and includes a third mode that requires the player to play the strings and depress specific buttons on the guitar.

Abstract: An electronic musical instrument displays a musical score including lyric character strings on a displayer 21, using music data stored in a storage device 43, by program-processing by a computer main unit 42. The music data includes a series of data representative of a lyric character string separated by break of lyrics, word, or segment of a sentence, the series of data stored in associated relation with data representative of a timing indicative of progression of a musical piece. The computer main unit 42 displays, on the displayer 21, a lyric character string which is not provided with enough display space in a display style different from a display style used for a lyric character string provided with enough display space. For example, part or the whole of characters of either of adjacent overlapping character strings is omitted, with a mark representative of being omitted attached. Alternatively, part or the whole of a preceding character string is displayed in a reduced size or in rows.

Abstract: An automatic music selecting system is provided which can select a piece of music more suitable for an occupant of a mobile unit. It includes a music data storing section that stores music data corresponding to a plurality of pieces of music; a navigation system for detecting the current position of the mobile unit; a first keyword generating section for generating a first keyword in response to current position information indicating the current position detected by the navigation system; sensors for detecting environment of the mobile unit; a second keyword generating section for generating a second keyword in response to the environment information indicating the environment detected by the sensors, a music selecting section for selecting a piece of music in response to the first keyword and second keyword; and a reproducing section for reading the selected music data from the music data storing section to reproduce.

Abstract: The invention concerns an electric guitar comprising a body (1), a neck (2) fixed to the body and a scroll (3) located at the free end of the neck (2). The body (1) consists of a base body, an upper cache which covers the front side of the base body and is provided with an orifice for the chord support (5), and a lower cache which covers the rear side of the base body. The base body bears the chord support (5), the read head(s) and the connection socket (7) for the amplifier cable.

Abstract: A head mounting display of a goggle type has a display, on which a guide image representing a model performance manipulation and an eyesight image of a practitioner are displayed in a superimposed manner. The guide image is adjusted its display size and position to be displayed on the display based on an image of a keyboard portion included in the eyesight image. Further, resolution and number of colors of the eyesight image are adjusted so as to meet those of the guide image or an animation image, resulting in reduction of data to be processed. Further, a side eyesight image of a hand of the practitioner playing an instrument is taken from the side, and it is determined if the practitioner's hand in the side eyesight image coincides with a model hand posture defined by judgment data which represents model manipulation performed in synchronization with progress of a song.

Abstract: A recoil and muzzle blast dissipator may be attached to the barrel of a gun and may redirect propellant gasses. In one embodiment, a recoil and muzzle blast dissipater may include a body portion having an internal plenum and a plurality of vent slots, each vent slot having an aperture in communication with the internal plenum. Each successive vent slot may include an aperture that is larger in area than the aperture of the previous vent slot. An exterior tube may include a side port and may be arranged to overlay the body portion such that a portion of each vent slot is covered by the exterior tube, and a portion of each vent slot is in communication with the side port.

Abstract: A weapon system having a gun barrel and an in bore air regulation system. The gun barrel has a first end and a second end. The gun barrel has a bore formed therein that extends from the first end towards the second end. The bore is adapted to receive a round. The in bore air regulation system is operably attached to the gun barrel so that the in bore air regulation system is in communication with the bore to regulate air pressure in the bore and thereby control the position of the round in the bore.

Abstract: The invention provides a self-aligning device for aiding the engagement of a munition into a rifled gun barrel on loading of the munition, absent the use of a driving band, as, for example, in the case of a munition which is fitted with aerodynamic tail fins. The device comprises at least one annular ring to surround the munition, and which, if desired, can be seated on a surface of the munition which allows the ring(s) to rotate. One or more of the rings has a number of elements which are capable of lying within the outline of the ring or rings to allow the munition to be readily loaded into a gun barrel but which can take the form of projections extending radially outwards from the ring(s) when they become coincident with the internal rifling of the gun barrel on further movement of the munition along with barrel or when the munition is rotated. The projections then engage in the rifling grooves and provide a sealing effect.

Abstract: A micro-adjustable hydraulic driving device includes a hydraulic cylinder, a control valve, and a cam. By utilizing a cam, it can precisely control the position of the sliding block and controls the size of the flowing cross-sectional area. So, it can achieve the purpose of precise controlling for the push rod to move slowly or stay at a desired position within the stroke. This invention can precisely control the moving speed and position of the push rod of the heavy load hydraulic cylinder. It can achieve the micro-adjusting effect. It can quickly reverse the moving direction and is easy to operate and control. And, its structure is simple with lost cost.

Abstract: An attachment control system includes an electrical control system and hydraulic control system. The electrical control system interfaces with the hydraulic control system to ensure that attachment decoupling in response to operator electrical control can occur only when at least two different hydraulic threshold conditions are satisfied. In one example, decoupling is prevented unless the attachment is safely positioned (e.g., full curl) in response to operator manipulation of a joystick or other attachment positioning device. This can be detected, for example, when the hydraulic system has an overall operating pressure at or above a first threshold and a joystick pilot pressure at or above a second threshold.

Abstract: A reciprocating pump assembly includes piston rod that is movable and reciprocates in order to pump a fluid. The piston rod has a piston portion at an end that stokes within a piston chamber. The pump assembly also includes a piston rod sleeve that houses the piston rod. The piston rod sleeve does not reciprocate with the piston rod. Thus, the piston rod sleeve remains stationary. The piston rod sleeve defines and annulus between the piston rod and the piston rod sleeve. The pump assembly has a fluid line that leads into the annulus. The fluid line delivers coolant to the annulus. The pump assembly also includes a flow passage. The flow passage has an inlet in fluid communication with the annulus for receiving the coolant. The passage also has an outlet in fluid communication with the piston chamber for delivering the coolant.

Abstract: A method and device for forming a sliding seal between a reciprocating piston (22) and the wall of a cylinder (8), wherein one side of the piston faces a first liquid in a pump chamber (26) of the cylinder (8), a first piston seal (24) and a second piston seal (58), spaced from the first piston seal (24), sealing between the piston and the cylinder (8); and wherein a second liquid is supplied under pressure between the seals (24, 58), the pressure of the second liquid between the seals (24, 58) being maintained at a level essentially equal to or slightly lower than the pressure of the pump chamber (26).

Abstract: A pneumatic force-generating device, for example, a pneumatic cylinder for balancing the ram weight on a press, is provided with an impact or catching device having an impact plate (24) for catching the piston (18) upon discharge of the weight. The deformable impact plate (24) is securely clamped along its edge or held by a clamping device (31), that permits a controlled slipping through. The impacting piston (18) deforms the impact plate (24) to absorb the kinetic energy produced if this piston is released as a result of damage and is accelerated by the existing gas bolster and thrown against the impact plate (24).

Abstract: In a piston for a compressor, the piston comprises a stem by which the piston may be guided in the housing in an axially displaceable manner, and a force introducing section where an outer drive force can be introduced into the piston. The piston head, the piston skirt and the force introducing section are successively arranged in the direction of the piston axis. The piston head, the piston skirt and the force introducing section are produced as a single element of graphite or a synthetic material, and the piston skirt comprises a solid strut structure and a guide section, the cross-sectional area of the strut structure being smaller than the surface of the piston head. The piston consists of a non-organic, non-metallic material having an average thermal expansion of less than 7×106/° C. in the temperature range of 0° C. to 200° C.

Abstract: A compressor comprising a cylinder (1) with an axially reciprocating piston (5) which compresses gas in the cylinder. At least two circumferential rows of flat fan spray nozzles (10) spray water into the cylinder during compression. Each nozzle is arranged such that the spray is in a plane substantially parallel to the axis (4) of the cylinder and is directed towards a central region of the cylinder.

Abstract: A piston for an internal combustion engine which comprises a piston body, and a ring element, which together form a basic piston body. When the ring element is screwed onto the piston body, it forms a ring shaped cooling channel which is closed off in a direction of the pin bosses by a projection of the basic body. The projection is structured in the form of an elastically resilient cup spring which is deformed when the ring element is screwed onto the body. This deformation and counter stress, contributes to the strength of the screw connection.

Abstract: A method for determining the characteristic properties of soot particles originating from combustion processes utilizes the determination of the blackening of a filter paper. In order to allow for achieving a quick and relatively accurate determination of the particle sizes, possibly of further characteristics as well, a method of this kind provides that the pressure conditions on the filter paper are established as well. It is advantageous for this purpose to determine the differential pressure on the filter and/or filter paper caused by the deposition of the particles.

Abstract: The present invention relates to a method for curing a defect in the fabrication of a composite gas separation module and to composite gas separation modules formed by a process that includes the method. The present invention also relates to a method for selectively separating hydrogen gas from a hydrogen gas-containing gaseous stream.

Abstract: A method for reducing shock during a flow of fluid between a higher pressure vessel and a lower pressure vessel. The method includes the steps of providing a conduit between the higher pressure vessel and the lower pressure vessel, and minimizing a rate of pressure change within the second vessel caused by the flow of fluid along the conduit from the higher pressure vessel. The minimizing step includes controlling a rate of flow of fluid between the first vessel and the second vessel over a predetermined duration.

Abstract: A device for enriching air with oxygen in an aircraft, and a method for operating the device provides product gas enrichment with oxygen with minimum requirements. An oxygen measurement apparatus analyzing the product gas flow as well as a throughput sensor are provided in combination with a change-over device. A flow connection to an outlet channel is created in a first switch position, and a flow connection to a consumer conduit exists in a second switch position. A device for producing a change-over signal from the first switch position to the second switch position is provided if the determined oxygen output as a product of the product gas flow and the oxygen concentration has reached or exceeded a predefined threshold value.