206results about How to "Reduce noise transmission" patented technology

A vibration damping clip of rigid material in which a softer lining is formed on the holding part of the clip including through an aperture in the holding part so that the lining is physically locked thereto. A similar lock is provided at an entrance or lead-in to the substantially annular holding portion of the clip.

A multilayered acoustic shield (1) for mounting to a panel of a vehicle, the shield (1) including an outer portion and an inner portion, the outer portion including a support layer (5) having apertures (6) therein, the inner portion including a sound-absorbing layer (9) and a vibration-dampening layer (11), wherein the shield (1) is fastenable to the panel of the vehicle such that at least a portion of the dampening layer (11) engages the panel with the sound-absorbing layer (9) being compressed between the outer portion and the dampening layer (11), to thereby reduce the transmission of noise into a cabin of the vehicle.

A bicycle chainring is formed from a first member and an second member. The first member includes a center rotational axis, a crank attachment portion with a plurality of chainring attachment openings and an annular tooth portion with a plurality of chain engaging gear teeth. The second member disposed around the center rotational axis and is fixedly attached to overlie at least one of the crank attachment portion and the annular tooth portion to reinforce the first member without obstructing access to the chainring attachment openings.

A vacuum cleaner for reducing noise from being transmitted to the exterior. The vacuum cleaner includes a main body forming an outer appearance of the vacuum cleaner and including a blower unit for generating suction force and blowing force and a discharge hole through which purified air from which foreign matter has been filtered is discharged, a discharge passage for guiding air discharged from the blower unit to the discharge hole, and a spiral shaped intercepting passage for forming a part of the discharge passage and for preventing noise of the blower unit from being transmitted to the exterior. A guide member forming the intercepting passage is disposed at the outside of the blower unit and serves as an acoustic absorber so that noise transmission to the exterior is reduced.

The present invention provides an apparatus for the supply of air for the treatment of sleep apnea. The apparatus of the present invention includes a motor and a fan unit. The motor and fan unit are enclosed in an inner case of flexible foam plastics material. The inner case is configured to contain the motor and the fan unit, and the inner case 48 is generally biased against the motor and the fan unit. The inner case is, in turn, contained within an intermediate case made of rigid material. The intermediate case conforms to and is substantially filled by the inner case such that the inner case is generally biased against the intermediate case. Finally, the intermediate case is contained within an outer case of rigid material. The outer case surrounds the intermediate case. The outer case is generally set apart from the intermediate case so that there is a gap between the intermediate case and the outer case. The inner case, the intermediate case, and the outer case are all interconnected to form a blower housing in a manner that reduces the transmission of noise from the fan unit and from the motor to the external environment to the outer case. The apparatus may also include a humidifier in fluid communication with the volute outlet so as to impart humidity to compressed air or other gasses provided to the patient. The apparatus may include a microcontroller and may be powered by battery. The microcontroller may receive signals from a battery voltage sensor, the motor rate of rotation sensor, and a pressure sensor. The microprocessor may execute an algorithm directed to maintain a constant pressure over a range of battery voltages by regulation of the motor rate of rotation in response to the battery voltage signal and the pressure signal. The control algorithm in the microcontroller may also be arranged to adjust a duty cycle of a heater in the humidifier to adjust the level of humidification provided by the humidifier.

An isolation seat assembly for a fuel injector that is at least partially disposed within a stepped bore defined by a cylinder head, the stepped bore includes a land. The isolation seat assembly includes a cupped spring washer and an elastomeric ring member disposed between the cupped spring washer and the land. The isolation seat assembly operates to bias the fuel injector away from the land to substantially isolate the fuel injector from the head. The cupped spring washer and elastomeric ring member may be bonded to one another. Additionally, the isolation seat assembly may include a washer member between the elastomeric ring member and the land. The washer member operates to distribute axial forces from the fuel injector to the land. At least a portion of the washer member may be crimped into engagement with the cupped spring washer, thereby capturing the elastomeric ring member therein between.

An air duct for vehicle air conditioning, includes a duct body defining a passage, and a passage dividing wall for dividing an interior of the duct body into a first passage and a second passage. In the air duct, the width of the duct body in an arrangement direction of the first and second passages in a bending section is larger than the width of the duct body in upstream-side and downstream side straight sections adjacent to the bending section, so as to increase a passage length difference (L1−L2) between the first passage and the second passage. Accordingly, the air duct has a structure capable of reducing the duct width while obtaining a desired passage length difference between the first passage and the second passage.

A composite panel has one or more recesses, or smoothly-contoured recesses formed in one or both opposing sides of a core. Reinforcement conforming to each recess is coupled to the core at the recess. First and second facing sheets are respectively coupled to the first and second opposing sides of the core.

A molded and shaped acoustical insulating vehicle panel having a dry-laid needled fibrous composite composed of a first portion of about 50 to 80 percent meltable binder fibers and about 20 to 50 percent stable fibers and having a second portion of about 20 to 50 percent meltable binder fibers and 50 to 80 percent of staple fibers. The meltable binder fibers are in a molded and resolidified state such that the resolidified binder fibers of the first portion form a substantially continuous, semi-impervious, densified skin integrally associated with and bonded to a surface of the first portion. The molded composite is in such a heat and pressure molded state that the composite has over a predominance of its area a density of from about 12 to 22 lbs./cubic foot (192 to 352 kg/cubic meter) and the panel is sufficiently rigid as to be self-supporting.

An operating space, particularly for a motor vehicle, which is bounded by an enclosure, wherewith more than half of the enclosure surface comprises a thermally and acoustically insulating lining material, and/or the enclosure surface is formed from insulating lining material, wherein the enclosure cooperates with an air intake louver system at an intake location that includes an air intake passage opening and at least one air intake louver wherein the intake louver(s) is adjustable between an open or passage position which allows passage of air, wherein the air-permeable flow cross section of the air intake opening is greater, and a closed or blocked position wherein the air-permeable flow cross section of the air intake opening is smaller, so that the amount of air per unit time which is admitted into the operating space through the air intake opening is less than when the at least one air intake louver is in the open position.

The amount of signal propagation and moisture penetration and corresponding reliability problems due to moisture penetration degradation in an IC can be reduced by fabricating two seal rings with non-adjacent gaps. In one embodiment, the same effect can be achieved by fabricating a wide seal ring with a channel having offset ingress and egress portions. Either of these embodiments can also have grounded seal ring segments which further reduce signal propagation.

A vacuum cleaner is disclosed which comprises a motor chamber for mounting a motor assembly that, generates a suction force at a dust suction port, and a discharge port for guiding an air discharged from the motor chamber to the outside of a cleaner body, wherein the motor chamber comprises an air discharge opening which is in fluid communication with the discharge port; and a path extension member disposed between the motor assembly and the air discharge opening, of which edges are spaced apart from an inner wall of the motor chamber by a predetermined distance, respectively, to thereby form a detour path, and the air discharged from the motor assembly is guided in a circuitous manner by the path extension member so as to be passed through the detour path before reaching the air discharge opening. That assembly effectively reduces noise generated during operation of the motor assembly that is detectable outside of the cleaner body.

An insulation package to reduce the transmission of heat and/or noise between the outer skin and the cabin lining of an aircraft composed of an insulating material enclosed by an encapsulating membrane. The encapsulating material has a vapor diffusion resistance (s_d value) at least partially dependent on the ambient humidity, and for a gradient of relative humidity across the encapsulating membrane of 3% to 50% it has a vapor diffusion resistance (s_d value) of at least 0.8 m and for a gradient of relative humidity across the encapsulating membrane of 50% to 93% it has a maximum vapor diffusion resistance (s_d value) of 0.3 m.

An elevator cab ceiling (22) includes an upper ceiling panel (26), a lower ceiling panel (28), and a ventilation channel (30) extending between the upper ceiling panel (26) and the lower ceiling panel (28). The ventilation channel (30) extends at an oblique angle relative to the upper ceiling panel (26) and separates space between the upper (26) and lower (28) ceiling panels into an upper cavity (32) and a lower cavity (34). A plurality of partitions (36) are formed within at least one of the upper (32) or lower (34) cavities. In one example, an acoustically resistive element (42) extends at least partially along a portion of the ventilation channel (30). The plurality of partitions (36) and the acoustically resistive element (42) cooperate to reduce noise levels transmitted into an elevator cab (10) via the ventilation channel (30).

An agitator mechanism for a clothes finishing cabinet provides a pendulum mounted hanger bar that may reciprocate under the application of a periodic force by an actuator without rigid connection between the cabinet housing and the hanger bar. Quiet operation is obtained by mounting an actuator motor directly on the hanger bar to be isolated by sound absorbing hanger support materials.

The invention relates to a nuclear spin tomographic radiography method (synonym: magnetic resonance imaging method, that is MRT) which is used for patient diagnosis in medicine. The invention especially relates to a nuclear spin tomographic radiography device to reduce vibration of components which constitute a magnetic resonance imaging equipment and reduce propagating paths of noise. This magnetic resonance imaging equipment includes a static magnetic field magnet (1), enclosed by a magnet container (12) for enclosing and bordering an inner space (21) and an inclined magnetic field coil system (2) disposed in this inner space (21). Silencing laminated plate structures (A-E-B, C-E-D) is provided on the inside surface (14) of the magnet container (12) for bordering this inner space (21). Consequently, acoustic vibrations, generated when the inclined magnetic coil system (2) is switched, are absorbed.

A guiding device controls the directivity of a sound that is reproduced from a speaker in accordance with an attribute of contents.

A sound barrier comprises a plurality of elongate sound arresting members arranged end to end and stacked vertically, one upon another, to form a barrier wall. The sound arresting members are disposed generally between a plurality of spaced vertical support members and are secured thereto by a plurality of elongate transition connectors coupled to each support members. The elongate transition connectors have distal ends that extend in directions toward oppositely disposed support members and are received within apertures formed in respective ends of the sound arresting members at their respective ends.