Abstract: A plurality of acoustical absorption elements are mounted in a two-dimensional spaced array on an acoustically reflective surface of an machinery enclosure, in such a manner as to expose portions of the reflective surface between neighboring elements. The elements are preferably of a substantially standard size and shape in order to enhance production and inventory efficiency, although materials of various thickness may be provided to accommodate tuning for specific frequencies to be absorbed.

Abstract: A device for damping the sound emission from oscillatory components of a fluid container of a hydraulic system, primarily in a motor vehicle. At least one vibration damping mass is coupled to the wall of a component subject to sound damping. The mass is adapted to the vibration to be damped by selection of material, shape, and/or position on the wall. For example, the mass is a rib fastened to the wall or a strip adhered to the wall. In an alternate embodiment, the container has an inner and an outer wall with a gap between them. The gap is either evacuated, filled with a sound absorbing material or ribs on the wall extend in the gap or inside the inner wall.

Abstract: An upper housing shell of a hermetically sealed refrigeration compressor has a central asymmetrical section interposed between a lower cylindrical section and an upper spherical section. The shape of the central section is such that opposite points define a line that is perpendicular to the surface at one point, but is not perpendicular to the surface at the opposite point.

Abstract: A noise dampener for a motor vehicle door lock including a door arrester bar which pivots about an axis extending parallel to a motor vehicle door hinge axis, which is pivotally secured to one of door assembly parts, a door or a door pillar, with a bearing bolt extending through a bearing bore formed in an end region of the door arrester bar and supported in a bearing block, and which extends into a retaining housing secured to another of the door assembly parts and having locking element(s) cooperating with detent marks provided in the door arrester bar for retaining same, with the noise dampener being formed as a hollow part made of a non-metallic, noise dampening material, surrounding, at least partially, the end region of the door arrester bar, and having an interior space closed at least at two sides with the bore having a shape corresponding to a shape of the end region of the door arrester bar and with the hollow part further including a locking nose formed on a wall of the hollow part corresponding to

Abstract: An acoustically insulated apparatus is disclosed which includes a machine and an acoustical insulation system for the machine, wherein the machine generates noise having a peak sound frequency. The insulation system includes a two-part stratum having a porous sound absorbing media layer, and a sound reflecting barrier layer located between the sound absorbing layer and the machine, wherein the two-part stratum exhibits maximum sound absorption at the peak sound frequency.

Abstract: A lightweight acoustic enclosure (1.1), for the reduction of noise transmission from monopole, quadrapole and higher order noise sources via airborne paths at frequencies lower than the approximate ring frequency of the enclosure (1.1), comprising an approximately spherical shaped enclosure (1.1), which is made from stiff materials to reduce the amount of stretching of the enclosure wall and substantially encases the noise source, all structural paths between the enclosure and the noise source comprising vibration isolation (2.4). The thickness of the enclosure wall can be relatively thin. The enclosure (1.1) can comprise multiple concentric layers of stiff material, ideally with adjacent layers having at least one compliant layer, such as foam rubber, sandwiched between them. The enclosure (1.1) can comprise several component parts such as spherical shell elements (1.2), with radii less than that of the approximate radius of the enclosure (1.1). Additional webbings or flanges (1.

Abstract: A damper for acoustic waves propagating in particular in a gaseous medium comprises a plurality of vibrational bodies including a plurality of laminas mounted substantially parallel and adjacent to one another. The plurality of laminas are mounted in a housing to form a free space between the upper and/or lower sides of the housing. The laminas vibrate within the free space to dissipate the energy from the acoustic waves.

Abstract: A shell for a hermetic compressor unit, the shell having a top section or dome, and a bottom section, the dome having a unique shape which gives enhanced capacity for absorbing and attenuating structural and fluid transmitted wave energies emanating from the unit at wave frequencies of between 1,000 Hz and 2,000 Hz, while reducing total operating noise of the unit, the dome being formed of sheet metal and having a generally inverted cup-shaped configuration with generally cylindrical sidewalls and a top wall having a central portion surrounded by a peripheral portion, wherein the sidewall taken in a generally axial direction is substantially straight, wherein the central portion of the top constitutes from about 40 to about 90% of the total area of the top and has a generally hemispherical configuration on a mean radius of from about 6.5 to about 10.0 inches as measured from an origin point O.sub.

Abstract: A dishwasher machine tub for containing water sprayed therein during operation of a dishwasher. The tub includes a wall, a door, and a first wall plate. The wall defines a dishwashing chamber having an opening. The door is connected to the wall and may be positioned to cover and uncover the opening. The first wall plate is spaced apart from the wall, resiliently connected to the wall, and positioned within the chamber. Preferably, the first wall plate is positioned so as to be directly impinged by some of the sprayed water during operation of the dishwasher. The air gap and the resilient connection between the first wall plate and the wall provide localized attenuation of the noise from the drumming impact of the sprayed wash water.

Abstract: A soundproofing device for a resonant scanner for deflecting a laser beam includes a plate member for fixing the resonant scanner, a plurality of stanchions for supporting the plate member, and a base for fixing the stanchions. The stanchions support the plate member at a position at which an amplitude of the plate member at a resonant frequency of the resonant scanner is minimum.

Abstract: A buckling-type paper sheet folder comprises a protective housing (7) and two pairs of folding cylinders (W1, W2, W3, W4) which are mounted in a cylinder frame (1) and conjointly driven by an electric motor (4). Folding pockets (5,6) and the cylinder frame are enclosed on all sides by the housing which has two parts, namely a base (8) and a cover (9), that are hinged and/or detachably connected to each other. In the base, a box-like compartment (12) is formed below the folding pockets accommodating the cylinder frame. The cover comprises a wall (45) extending between vertical side walls (40,41) and covering the upper foldin pocket (5) and having a portion (48) forming the upper boundary of a sheet intake opening. The cover further comprises a second wall (54) extending above the second folding pocket (6) inwardly, to form the lower boundary of the intake opening (51), and having a front portion 39.

Abstract: A locating table apparatus is provided with a housing, a base member fixed in the housing, a table mounted so as to freely move in a longitudinal direction, driving members located on the base member for supporting and driving the table, an outer cover covering the table, an inner cover formed with a U-shaped groove member for covering the driving members therein, and a sound absorbing member attached to at least one of the inner and outer cover, whereby the noisy sound generated inside the locating table apparatus is attenuated by and absorbed in the sound absorbing member.

Abstract: A honeycomb structure includes at least two corrugated strips having major flat surfaces extending angularly between opposed strip edges. The strips are offset relative to each other and joined together to define a series of cells extending between the strip edges along axes which are oriented at an angle other than normal to the strip edges. Each of the major flat surfaces includes a central depressed portion forming a matching sub-flat surface which is parallel to and connected to the major flat surface by sidewalls which may be substantially perpendicular to the major flat surface. Abutting undepressed portions of the major flat surfaces of adjacent strips and abutting sub-flat surfaces of adjacent strips are joined together so that the strips form a series of I-beams disposed one to a cell.

Abstract: A noise supression box is secured over the air inlet opening in the housing of a fiber opening machine which contains a plurality of rotatable opener rolls that open and feed fibers to an outlet formed in the housing adjacent its air inlet opening. The box surrounds in spaced relation thereto an air inlet duct which is secured at one end over the air inlet opening and communicates at its opposite end with the exterior of the box and housing. The walls of the air inlet duct contain a plurality of spaced perforations, and the space in the box around the outside of the duct is filled with sound absorbing foam insulation.

Abstract: The air-cooled type induction motor used for railway vehicles such as the electric car generates sound waves (noise) which are uncomfortable to the ears of the human being when it is rotated. An induction motor according to the present invention has therein a plurality of waveguide (or air guide) plates for efficiently exhausting air, which serves to cool the motor, outside the motor. These waveguide plates are arranged not to resonate with the frequency of the sound waves which are generated by the cooling air. The sound waves are guided outside the motor through the waveguide plates before it is amplified to a noise level which is uncomfortable to the ears of the human being. Noise caused when the motor is rotated at high speed can be thus eliminated.

Abstract: The press has a pneumatically operated piston and cylinder mounted beneath a work plate, and linked to an upper press plate by rods extending through the work plate to provide compression in a die-set area defined between the upper press plate and the work plate. The pneumatically operated piston and cylinder are encased within an enclosed base which is insulated. The movable cylinder acts against springs also mounted within the base which cause the press plate to rebound after a pneumatically operated downstroke.

Abstract: A sound-proofing panel for the cladding of machine tools consists of a foam board (28) of a thickness of at least approximately 10 cm., over which is glued a tear-resistant plastic sheet (38). The connection to the frame (12, 14) of the machine is made by means of self-catching strip fastenings (27).

Abstract: A printer case permits paper to be placed in a printer or the ink ribbon to be replaced without the need to remove the cover or the paper shelf. The case comprises a cover mounted on the upper surface of the case and a paper shelf mounted so as to be swingable about its rear end. Projection portions are formed at opposite sides of the upper surface of the shelf. The cover is swingable about its rear end and an opening having a given width is formed between the rear end of the shelf and the front end of the cover such that when the cover and the shelf are opened, the projection portions engage the front end of the cover to maintain the cover and the shelf in an open state.

Abstract: Supporting machine parts (cheeks) and movable machine parts, especially levers of a machine are provided with interspaces and/or cavities (pores) for proofing against or the damping of sound vibrations or sound-generating vibrations, the interspaces and/or cavities being filled with a sound-proofing or sound-damping material.

Abstract: Gas liquid mixtures readily absorb the wave energy of noise and thus reduce noise intensity. By circulating gas liquid mixtures through jackets surrounding noisy machines, such as internal combustion engines, undesirable noise can be reduced.

Abstract: A sound and vibration reducing apparatus is disclosed. This apparatus has particular utility for use with electrical appliances such as blenders. In one embodiment of the invention, a two-piece base is adapted to substantially enclose the motor and control portion of the appliance. The base is lined with acoustical film to reduce the sound and vibration emanating from the appliance. A control system is disclosed which enables the appliance to be fully functional while completely enclosed within the apparatus. Finally, in a preferred embodiment, the apparatus includes an upper portion, preferably formed of transparent acoustical film, which is used to insulate the upper portion of the appliance. This transparent upper portion is easily removable from the appliance and also serves to deaden both the sound and vibration emanating from the appliance.

Abstract: Disclosed is a sound insulating container for completely enclosing an electrical appliance. The container includes walls constructed of sound absorbing material and a door attached by hinges for completely closing the container. An electrical outlet is provided inside the container and is connected to a standard wall outlet by a conventional electric cord. A switch provided on the exterior of the container when the door is closed selectively supplies power to the interior outlet.

Abstract: An improved ice measuring and dispensing machine is of the type which includes an ice supply hopper, a housing having three measuring and dispensing chambers which continuously rotate about a vertical axis, and a discharge chute. Each of the chambers rotates beneath the supply hopper to receive ice by gravity flow therefrom. Each of the chambers filled with ice from the ice supply hopper rotates over the discharge chute to discharge the ice therein by gravity flow down the discharge chute into an ice bag. The improvement includes the rotating housing having a cylindrical wall which partially defines each of the chambers. A hammer device is reciprocated toward and away from the cylindrical wall to cause the head thereof to make repeated, jarring contact with the cylindrical wall to vibrate the chambers and thus prevent the collection or bridging of ice therein.

Abstract: A noise reducing apparatus in the form of a hollow body comprising two or more passage groups consisting of a plurality of passages. The length of each passage is determined such that the sound waves emitted from the passages of the adjacent passage groups form plane waves which are shifted by a half wavelength so that plane waves interfere each other. The apparatus can be secured to an opening of construction and reduce the level of sound pressure from a sound source without any closed shield construction surrounding the sound source.

Abstract: A vacuum brake booster assembly comprising front and rear housing shells connected to form a single piece their output peripheral edges and mounted within the passenger compartment of a vehicle, a piston body axially movable in the housing shells, a diaphragm member hermetically secured at its inner peripheral edge to the piston body and clamped at its outer peripheral edge by the outer peripheral edges of the housing shells to subdivide the interior of the housing shells into a vacuum chamber and a variable pressure chamber, and a pressure control valve cooperable with the piston body for selectively communicating the variable pressure chamber to the vacuum chamber or the atmospheric air in response to movements of the piston body, wherein at least the rear housing shell is formed as a double or multi layer wall for the variable pressure chamber to dampen air suction noises caused by expansion and vibration of the air flowing through the valve into the variable pressure chamber from the passenger compartment

Abstract: The sound produced by the movement of the teeth of an idling circular saw or band saw blade in air is substantially reduced by exposing the blade to a radiation impedance which is effectively imaginary, thereby subjecting a preselected portion of such sound to propagation cut-off. Propagation cut-off is achieved by providing a cover including a pair of closely spaced parallel acoustically hard-wall plates positionable on both sides of the blade. Preferably the plates are spaced apart by a distance less than 21 millimeters, and extend beyond the tips of the teeth by a distance several times the space between the plates. Portions of the plates may be moveable to expose the teeth during the cutting operation.

Abstract: A combustion chamber subject to the build-up of acoustic vibrations may have the vibrations inhibited by an electrode system which can be modulated to produce anti-noise. Sound is sensed by a microphone which may be mounted remotely to produce a control signal coupled to a voltage generator feeding the electrode system.

Abstract: A noise control system for reducing the noise level emanating from an air jet spinning machine includes an acoustical door for covering a jet chamber which contains the air jets. The door is automatically opened whenever a yarn suction tube is to be inserted into the jet chamber for a threading-up operation.

Abstract: In order to hold at a minimum the noise emission of the winding gear in a winding unit of a spinning machine for the processing of endless filaments, the winding unit is provided with a noise protection door which is pivotingly translatable from an initial or idle position at the side of the winding unit into an operating position in front of the winding unit. The noise protection door comprises a guide portion which is supported or guided by means of rolls and guide pins and a noise protection portion pivotally supported on the guide portion by means of pivot pins. The guide pins forming part of the guide portion and the guide pins forming part of the noise protection portion project into two guide grooves arranged in mirror-image fashion, one of which is provided in a floor plate and the other in a cover of the winding unit. Thus the guide portion is guided in a straight line and the noise protection portion is pivotally guided.

Abstract: A board having improved thermal and/or acoustical properties is disclosed, together with a method and apparatus for producing same. The board is of finite thickness and has a graduated density, the two opposing major surfaces have the greatest density and the intermediate portion has the least density with the board density gradually decreasing in the region between the major surfaces toward the intermediate portion thereof. The board is produced by a molding process, wherein blankets of loosely gathered fibers and containing a suitable binder, are utilized to form the board. The blankets are preferably high compressible and have interposed therebetween an initially relatively highly incompressible air filled member. These laminates are pressed together between a pair of heated mold halves. As the temperature of the laminate increases, the interposed member softens and is rapidly reduced in thickness due to the escape of air as it softens and melts.

Abstract: A housing for an impact printer has a case body and a cover thereof. They define therebetween an opening for the passage of the paper to be printed and the printed paper. A paper shelf lies over the top surface of the case body, and supported at one end rotatably away from the case body. The end of the paper shelf is located in the vicinity of the opening, and spaced apart from the case body and the cover only to the extent required for the passage of the paper to be printed and the printed paper. The top surface of the case body has at least one projection extending transversely of the paper to be printed. The paper shelf has a lower surface facing the top surface of the case body and formed with at least one projection extending transversely of the paper to be printed. This projection is spaced apart from the projection on the case body longitudinally of the paper to be printed.

Abstract: A sealing means on a vehicle cab for force and motion transmitting members between the control levers in the cab and the control devices external of the cab.The force and motion transmitting members or energy transmitting members are connected to the controls and extend through an opening in the corner of one of the cab walls and the floor. A carrier plate having slots receives the cables or wires and a plate having a deformable layer is clamped between the cover plate and the carrier plate to form an airtight seal around the cables or wires thereby closing the opening in the wall and floor and providing an airtight seal and a thermal insulating medium as well as a sound dampening device.

Abstract: An acoustical enclosure system, particularly designed for overtable circular saws employed in cutting such materials as metal shapes, is disclosed. The system includes an acoustical enclosure covering the saw and a pair of vibration damping arms covering the workpiece being sawed. This combination of elements results in substantially reduced noise levels within the sawing environment.

Abstract: An acoustic enclosure is provided having top, bottom, front, side and back panels formed to receive and enclose the face plate and chute of a crowner machine. Acoustically absorbant and cleanable material is disposed on the interior surfaces of the side portions to absorb sound produced at the crowner face plate and chute, and the edges of the enclosure abutting the crowner machine include a material for creating a seal therebetween to further reduce the sound level in the immediate area.

Abstract: Disclosed herein is a flexible acoustical laminate construction which can be applied to noisy enclosures in order to attenuate noise therein. The construction of the invention finds particular use as a cabliner for the cabs or crew compartments of heavy construction, industrial, mining and transportation equipment of various types.

Abstract: A device for reducing the emission of noise in buckle folding units provided with noise control enclosures, comprising a noise control hood 5 essentially completely enclosing the upper 41 and lower folding pockets 42 and the folding rolls 7, said noise control hood 5 being at least partially slidingly displaceable, tiltable and/or removable and being provided with a slot for the passage of the sheet in the associated hood section, which slot is aligned with the nip of the pair of intake and discharge rolls, respectively, is improved by further reducing the noise emission in the sheet discharge area without influencing dependable function and easy access to this area.

Abstract: An installation for electrohydroblasting of castings comprises a base, a bath placed on said base, a mechanism for feeding castings into the bath, an electrode, and a mechanism for introducting the electrode into the bath and a pulse current generator coupled electrically to the electrode. An insulated casing is mounted on the base over the bath. The insulated casing is built of a latticed framework whose openings are covered with slabs, each being formed with two metallic boxes, one inside the other, so that the ends of one box face a bottom of the other, box with a space formed between the bottoms, intended for a vibration-absorbing material to be fed thereto and with the metallic boxes being grounded.

Abstract: A sound insulating arrangement for a vehicle including a gear shift lever extending upward into the passenger compartment of the vehicle through an aperture formed in the floor panel thereof is disclosed. The arrangement comprises a shift lever boot having a bottom opening larger than the aperture and a top opening in fitting engagement with the gear shift lever and secured to the floor panel so as to cover the aperture. The arrangement also comprises a sound insulating plate having a center hole for penetration of the gear shift lever and a number of slits radially extending from the center hole for freedom of movement of the gear shift lever. The shift lever boot is provided at least partially with a bellows portion in one fold of which the sound insulating plate is fitted.

Abstract: A free standing indirect lighting fixture utilizing a one-piece molded reflector and a diagonally mounted high intensity discharge lamp has a frosted diffuser over the lamp. Acoustic material on the fixture absorbs ballast hum as well as adding acoustic absorbtion to the room. A back lighted information strip may optionally be included.

Abstract: A foam seal and insulator for sealing a compartment in the control console and attenuating sound in the compartment which contains a plurality of actuating levers for controlling the operation of the vehicle with actuating cables extending through the insulator to control the operation of the vehicle.

Abstract: A soundproof hopper for a comminuting machine having an inner hopper mounted to the comminuting machine and an outer hopper loosely supported by the inner hopper. The space between the inner hopper and the outer hopper contains soundproofing material.

Abstract: A piling rig comprises two sound-reducing enclosures arranged one over the other. In use the bottom enclosure is arranged around a row of piling and the top enclosure surrounds the piling hammer as it moves along the row of piling for pile-driving or pile-extraction purposes.

Abstract: A muffler is provided for use in conjunction with a jet for treating a running length of yarn. Audible noise which is emitted by the jet is reduced by at least 11.5 .DELTA.dB(A) through the use of a housing to substantially enclose the jet. The housing has openings for the entrance and exit of a yarn and is at least partially lined with sound absorbing material; sound absorbing material also closes the openings in the housing. The travelling yarn abrades through the sound absorbing material at the openings to form an operational passage to and from the jet.

Abstract: Semi automatic machines such as relay coil winders are mounted in cabins arranged in a semi circle around an operator position. Each machine is normally closed inside its cabin during automatic operation, but is caused to leave its cabin and move towards the operator when it needs manual attention. Particularly applicable to noisy machines which need intermittent manual attention since the cabins provide soundproofing during operation.

Abstract: A cover for acoustically enclosing a conveyor is described. The cover includes a curved, dome-shaped or gabled top portion and two side walls which project downwardly from the top portion to a support structure for the conveyor. Also, the cover includes acoustically absorbent or dissipative material for attenuating noise internally generated within the cover. At least one of the side walls includes a pivotally mounted door which provides access to the conveyor. Since the cover is curved, dome-shaped or gabled and does not include any horizontal surfaces, an accumulation of moisture within the conveyor cover is prevented.

Abstract: The cover for a weaving machine is formed, in part, of flexible mats of sound-insulating material which can be raised or lowered in the manner of a window shade.In one embodiment, the rollers on which the flexible mats are mounted are positively driven to raise or lower the mats while a toggle means is used to support the mat over the machine frame. In addition, the rollers are mounted in a carriage which can be moved to one side while the sides of the cover are opened to allow access to the machine from above.In another embodiment, the flexible mats are in an accordion or pleated form and are raised or lowered via an endless chain.

Abstract: An internal combustion engine having the cylinders thereof arranged in a V-formation and having a sound deadening material jacketing the body of the engine. Two plate-like carriers are gripped between the confronting parts of the cylinder housing and the outwardly projecting rims thereof to constitute a frame which surrounds the engine body from all sides. A plurality of deadening shells conforming to the shape of the engine body bear in sealed fashion against the frame with the interposition of at least one vibration deadening insert. These shells are secured to the body of the engine with the intermediary of spacer elements providing a vibration dampening support.

Abstract: A cover is located over the noisiest part of the weaving machine, i.e. the shafts of the shedding mechanism and the reed and extends, at most, to the breast beam at the cloth and of the weaving machine. The cover is made of hinged members or of a flexible sheet so as to be folded out of the way when access to the shafts or reed is required.

Abstract: A noise attenuating enclosure for a hydraulic valve is provided. The enclosure has separate top, bottom, side and cover members fabricated from sheet metal material and lined with relatively thick sound energy barrier material such as a foam rubber or polyurethane foam. The cover member has opposed open side portions for receiving hydraulic lines for the valve. Such open sides are filled during valve operation by means of fitted rubber plug members having closely fitting apertures for sealingly accepting the hydraulic lines. All fastening and access points and all locations where metal to metal contact would normally be necessary are provided with noise suppression material.

Abstract: A pneumatic tube system for conducting banking transactions with a non-captive carrier traveling between a bank teller terminal in a two-tube carrier conveyor connected with a remote customer terminal with visual communication between the teller and the customer. The terminals and tube structure and their components are combined, interrelated and cooperatively arranged with simple and inexpensive construction to provide quiet and reliable operation. Prior complex carrier delivery and dispatch holding and release devices and blower operating timers and controls are eliminated. The operation of a blower located at the customer terminal, which supplies air for pressure or vacuum movement of the carrier in the two-tube system, is controlled by carrier arrival at or dispatch from either terminal. Noise emanating from air currents in the system is reduced by mufflers located at the terminals in the tube system. The carrier moves through one of the mufflers during travel.