Abstract: An automatic combinatorial weighing apparatus includes a double collection chute assembly disposed in delivery paths for passage of articles to be weighed. The double collection chute assembly includes an inner collection chute having an outlet and a pair of outer collection chutes having respective outlets, the outlets being connected to timing hoppers, respectively. Articles flow down the inner and outer collection chutes at as equal speeds and in as equal times as possible, the speeds being increased as much as possible, due to valleys created by flat plates which form the chutes. To prevent an increase in noise produced by hitting engagement of the articles with the chutes as the articles flow down the chutes at high speeds, a vibration damper having a vibration-restriction damping capability is disposed in an area of the delivery paths for damping the vibration to suppress the noise.

Abstract: A suspension mechanism for an acoustic apparatus which includes a reproduction mechanism portion and a container for containing the same, the suspension mechanism provided between the reproduction mechanism portion and the container; and the suspension mechanism includes a first elastic element for supporting the weight of the reproduction mechanism portion, and a second elastic element for absorbing vibrations transmitted to the reproduction mechanism portion.

Abstract: A propeller thruster installation includes a propeller unit rigidly supported in an inner tunnel tube which in its turn is elastically coaxially supported in an outer tunnel tube which is rigidly secured to the hull of a ship. In order to reduce the transmission of noise and vibrations from the propeller unit to the interior of, an ship the annulus between the outer and inner tunnel tubes is filled with elastic gas cushions, or a continuously maintained "bubble curtain" of air.

Abstract: A vibration-absorbing system for an automotive vehicle with a vehicle body, includes an automotive vehicle accessory and a mounting device. The mounting device has a resiliency. The mounting device attaches the accessory to the vehicle body so that the accessory will be resiliently supported on the vehicle body. The accessory with the mounting device is able to be vibrated and has an eigenfrequency in relation to the vibration thereof. The eigenfrequency is set to a relatively low value.

Abstract: Flexible bellows are utilized between two systems, such as a pumping system and a process station, to partially absorb system vibrations and to compensate for misalignment between the systems. It is common practice to either clamp a rigid spacer between flanges of the two systems (FIG. 3B) to separate them from each other, or to maintain the bellows in unsupported relationship between these systems (FIG. 4B). In the former bellows arrangement, the rigid spacer transmits vibratory energy between the two systems and the bellows tends to function as an undamped or underdamped unit that resonates at its own frequency to create additional vibratory energy, transmitted to the systems. In the latter, unsupported bellows arrangement (FIG. 4B), the pressure differential prevalent between the fluid flowing through the bellows and ambient normally causes extension or retraction of the bellows and resulting misalignment problems.

Abstract: A damper for tunably damping acoustic waves in an ultrasonic waveguide is provided which may be used in a hostile environment such as a nuclear reactor. The area of the waveguide, which may be a selected size metal rod in which acoustic waves are to be damped, is wrapped, or surrounded, by a mass of stainless steel wool. The wool wrapped portion is then sandwiched between tuning plates, which may also be stainless steel, by means of clamping screws which may be adjusted to change the clamping force of the sandwiched assembly along the waveguide section. The plates are preformed along their length in a sinusoidally bent pattern with a period approximately equal to the acoustic wavelength which is to be damped. The bent pattern of the opposing plates are in phase along their length relative to their sinusoidal patterns so that as the clamping screws are tightened a bending stress is applied to the waveguide at 180.degree.

Abstract: An ultrasonic sound absorbing material capable of operating at high temperatures and pressures, said material comprises a dense, rigid, permeable material such as sintered metal filled with a viscous fluid.

Abstract: A system for insulating and isolating a pipe, thermally and acoustically, from its outer metallic cover or lagging, with the system consisting of a pipe jacket providing an external cover or lagging, an inner body of insulation such as fiberglass or the like, a vibration absorption unit and a series of spacers yieldably separating the jacket from the pipe to be insulated.

Abstract: A damping device for use with acoustic information generation machines for isolating a generation portion of the generation device from contamination by extraneous acoustic emissions. A metal isolation piece consisting of a shape-memory alloy is disposed between an extraneous noise source and the generation portion of the device. Acoustic information generation devices in accordance with the present invention include phonograph record playing devices and testing devices for recording acoustic signals generated upon stressing a test piece. Thus, the present invention provides improved phonograph record playing devices and an improved testing device.

Abstract: A drill motor rigid enclosure is provided for a rock drill motor. The drill motor is encompassed within the enclosure such that viration, torque, and thrust produced by the motor is isolated from the rigid enclosure, therefore noise reduction of the drill motor is achieved.

Abstract: A device for absorbing kinetic energy derived from an element oscillating in a direction parallel to a longitudinal axis of the device. The device has a housing coupled to the oscillating member and defining a chamber bounded by opposite inner end walls and an inner lateral wall of the housing. The inner end walls are generally transverse to and the inner lateral wall is generally parallel with the axis of the device. An oscillation quencher body which is situated in the chamber, has opposite end faces oriented towards respective inner end walls and a lateral face oriented towards the inner lateral wall. A resiliently deformable impact member is situated between each end face of the body and a respective inner end wall of the housing. Further, at least one groove is provided in the lateral face of the body. The groove has a length generally transverse to and a width generally parallel with the device axis.

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: Body noise or mechanical vibrations are damped by a sound or noise damping overing that may be secured permanently or temperarily to the surfaces of a body to be damped in the manner of an adhesive tape. The tape or band type damping covering comprises two layers of platelet elements of highly elastic material interconnected with play, for example by hooks. The layers are so arranged that the platelet elements in one layer are staggered relative to the platelet elements in the other layer. An intermediate layer of a plastic type material is interposed between the two outer platelet layers. The plastic material converts shearing stresses and hence the vibrations into heat. The plastic material may be a gel which absorbs liquid.

Abstract: A novel method of producing a vibration damping and sound absorbing coating on a rigid substrate is provided in which method a first coating of a viscoelastic material having after gelling a modulus of elasticity of 5.times.10.sup.6 to 5.times.10.sup.8 dynes/cm.sup.2 is sprayed onto the substrate whereafter there is sprayed onto said first coating a second coating of a viscoelastic material having after gelling a modulus of elasticity of 5.times.10.sup.7 to 5.times.10.sup.9 dynes/cm.sup.2, the modulus of elasticity of said second outer coating being at least 10 times greater than that of said first coating.

Abstract: The assembly comprises a structural member, for instance one made out of wood, surrounded by a sheath member made out of rigid or semi-rigid plastic material, the outer contour of said core member and the inner contour of said sheath member being established to provide space or play therebetween forming a damping cushion, said members being interconnected by zones of reduced area. In a typical embodiment, the inner core member has longitudinally extending grooves formed in the periphery thereof defining ribs therebetween the peripheral contour of which generally corresponds to the inner contour of the sheath member.

Abstract: The impact beam of a mechanical printer is constructed for noise dampening and yet exhibits a high resistance to wear. The beam unit comprises a block of dampening material which is held along a carrier support wall. A strip of metal is arranged along an exterior, generally flat surface of the block so as to be completely separated from adjacent surfaces of the support wall by a region of block material. The metal strip is arranged to receive the impact of type bars and other noise-inducing mechanical force elements of the printer. The noise emanating from such impacts are dampened as they travel through the block material. There is no direct connection between the metal strip and the housing of the mechanical printer in order to prevent direct transmission of noise vibrations from the strip to the housing.

Abstract: A structure for supporting an air filter on a carburetor, the air filter having a casing accommodating an air filtration element and a cap adapted to close the upper opening of the casing, the cap being adapted to be centered and fixed to the carburetor by a cooperation of a center bolt projecting upward from the carburetor and a butterfly nut. The supporting structure has a supporting member adapted to be fixed to the carburetor, an annular disc-shaped first resilient member connected at its inner periphery to one end of the supporting member and at its outer periphery to the casing of the air filter, and a second resilient member through which the cap of the air filter is fixed to an opposite end of the supporting member. The vibration of the casing and the cap of the air filter is avoided thanks to the first and the second resilient members which insulate the casing and the cap from the vibration caused by the engine to which the air filter is attached.

Abstract: A damping body composed of two substantially parallel, oppositely situated support surfaces for supporting a machine mounting base or foundation frame and for contact with a machine pedestal or socket arrangement. To obtain a uniform damping of sound and vibrations and to achieve a certain leveling of the machine mounting base, the damping body comprises at least two substantially wedge-shaped partial bodies which, in their unloaded state, can be shifted relative to one another along parting surfaces which are not in parallelism with the support surfaces. The damping body may be particularly advantageously employed for mounting elevator drive machines or the like.

Abstract: The present invention is concerned with an element for the sonic and vibratory absorption, comprising a ledge having ribs of flexible material longitudinally extending along the top and bottom sides, with the top-side ribs over the bottom-side ribs being arranged in staggered relationship. According to the invention, such an element is improved in that provided between respectively two ribs of approximately trapezoidal cross-section is another rib equally of approximately trapezoidal cross-section of an inferior height, which continues to extend through the central area of the element upwardly and downwardly, respectively, in the respective rib of greater height, and that at least on one longitudinal side of the element a stop is provided extending over the entire length of the element.

Abstract: An engine-transmission assembly wherein the engine in it is connected to a rear transmission unit by a supporting pipe which serves to reduce vibration and noise. According to preferred embodiments of the invention, the supporting pipe includes at least one outer pipe and an inner pipe fitted therein which are interconnected at only ends and are held in position via a friction seat. The pipes forming the supporting pipe can be of equal length and thickness or can be of varying length and/or thicknesses according to other embodiments.

Abstract: An article especially suited for use as a vibration isolating or shock absorbing structure comprising a multitude of short, resiliently compressible, elastic, tubular, rubbery bodies held together in closely-packed relationship by restraining means. The rubbery bodies comprise a cured thermosetting millable extrudable composition having in the cured state an elasticity in excess of 200% and an elongation at break in excess of 300%. The tubular bodies are characterized by having a length to diameter ratio from about 2:1 to about 8:1 and a wall thickness of at least 0.025 inch.

Abstract: This invention has for its object to eliminate the problem of loud noise and violent vibrations in machines having transient force characteristics of the type appearing in punching or cutting presses.According to the invention this is achieved by means of a damping device comprising a housing defining a chamber filled with a hydraulic fluid said fluid being pre-compressed by a first piston acted on by the force and said pre-compressing being carried out to a pressure corresponding the force to be dampened. Immediately before the force relief the force is arranged to act on a second piston of bigger cross sectional area said second piston preventing a too rapid force relief of the press frame due to the pre-compressed hydraulic fluid.The force relief occurs rather slowly due to the fact that the hydraulic fluid trapped in the chamber is exhausted via control valve keeping the pressure in the chamber almost constant and only permitting a certain volume flow therefrom.

Abstract: An internal combustion engine for an automobile is encased in a sound-insulating casing and is mounted on a frame of the automobile via sound-proofing suspensions. The wall of the casing extends around the suspensions, at which point the casing is supported on the frame by means of casing wall portions. These casing wall portions are acoustically insulated from the remainder of the casing wall by sound-insulating intermediate layers, e.g. by flat, elastic, annular sealing rings.

Abstract: The noise emanating from a noise-generating source, such as a machine tool or a stock tube, is reduced by covering the surface from or through which the noise emanates with a cladding comprising a first layer, an intermediate layer, and an outer layer. The first layer, 1 to 5 mm thick, of a resilient vibration-isolating material, being plastic foam, rubber foam, rubber, or fibrous material, has the function of decoupling the intermediate layer from the surface. The intermediate layer, 0.25 to 2.5 mm thick, of lead or metal-loaded plastic material in contact with and supported by the first layer, has the function of a sound-insulating barrier. The outer layer, resistant to impact, wear, and abrasion, has the function of surface protection. The total thickness of the three layers need be no more than 6 mm.

Abstract: The present noise damping apparatus is especially intended for damping the noise caused by wheels running on rails. For this purpose there is provided a noise screen connected to at least one surface of the rail wheel in a force transmitting, yet removable manner. The noise screen comprises vibration damping reed members. This screen prevents noise generated by the wheel proper from radiating outwardly and it also acts as a noise absorber for the impact noise propagating in the wheel and other solid bodies.

Abstract: A vibration damper for an impact tool comprises a damping material which at least partly surrounds the working part of the tool, a heat shrinkable sleeve for holding the damping material in place on the working part of the tool.

Abstract: A vibration damper for damping sound propagating in solids includes vibran damping horn members connected through a damping material to a support point on the surface of the solid in such a manner that a tapering portion of the horn member contacts the solid through the damping material. The taper in a horn member, for example of circular cross section, is considered to be the curvature of the horn member away from a generatrix of the horn member. The damping factor of the connecting damping material is equal or substantially equal to the terminal impedance of the horn member.

Abstract: A noise reducing washer for the spindle of a textile machine has a pair of outer hard resilient washers, for example, of nylon, and a soft washer, for example of rubber, sandwiched therebetween. The composite washers are adapted to be fit on the spindles above and below the machine frame.

Abstract: A vibration isolation system for a cover mountable on a vibratable engine includes a plurality of resilient grommets positioned about a plurality of stripper bolts which are inserted into the cover and through a resilient sealing gasket to threadedly secure the cover to the engine. The grommet and gasket have spring rates within a predetermined range of each other to provide maximum isolation of the cover from the engine.

Abstract: A muffler mounting apparatus in a construction vehicle comprising a vehicle body, an engine mounted on the vehicle body, a muffler connected to an exhaust port of the engine to reduce the noise level of exhaust gas, a pair of supporting levers to support the muffler, one end of the supporting levers being pivotally connected to the vehicle body and, a pair of linkages pivotally connected between the engine and the muffler supporting levers, whereby a vibration caused by the engine can be absorbed by combined operation of the supporting levers and the linkages.