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| Number | Title | Issue Date |
| 5196253 | Sound absorbing heat shield with perforate support layer A heat shield (1) includes a support layer (2) that is perforate only in predetermined partial areas (6, 7, 8) and comprises an insulation layer (3) that has a protective coating (4, 5) on both sides thereof. In particular, flange areas (6), attachment ar... | 03/23/1993 |
| 5170020 | Rainproof exhaust pipe A vertical exhaust pipe having an inner pipe with an upper opening. An outer pipe is positioned around the inner pipe and has an end portion that extends beyond the upper opening in the inner pipe, said end portion defining an outlet through which exhaust... | 12/08/1992 |
| 5147012 | Discharge silencing apparatus A discharge silencing apparatus having a noise abating device, a housing enclosure for the device and an integral frame for supporting a blower and accompanying motor. The frame provides support for the blower and provides sealing ends for the enclosure t... | 09/15/1992 |
| 5101886 | Combination power and heat unit The invention relates to a combination power and heat unit with a bedplate (1), flanged-together machines (2, 3), a noise suppressor (8), an exhaust-gas heat exchanger (9), a cooling-water heat exchanger (19) as well as the associated auxiliary apparatus ... | 04/07/1992 |
| 5036947 | Exhaust pipe shield An exhaust pipe shield for motorcycles or the like comprises curved shield member having a generally constant radius greater than that of a cylindrically shaped exhaust pipe. A plurality of spacer blocks are interposed between the shield inner surface and... | 08/06/1991 |
| 4923033 | Heating device, particularly automotive heating device, with an integrated muffler A heating device, particularly an automotive heating device, in which a noise muffling device is integrated within the heating device. The muffler can be provided in the combustion pipe defining the combustion chamber, or the combustion pipe, itself, can ... | 05/08/1990 |
| 4921040 | Power thermo-coupling unit A power thermo-coupling unit with muffler (4, 5) and exhaust gas heat exchanger (6, 7) avoids the requirement of a disproportionately large space for component removal at the front end of the power thermo-coupling unit. The muffler (4, 5) and the exhaust ... | 05/01/1990 |
| 4862993 | Fireplace flue ambient noise reducing device A fireplace provided with a sound reducer is shown. The sound reducer eliminates ambient noise feeding back to the indoor through the flue system of the fireplace.... | 09/05/1989 |
| 4832151 | Muffler cover for internal combustion engine A muffler cover has a plurality of air holes formed therein. At least part of the air holes is formed in such a manner as to have configurations which indicate characters or symbols, and at least those portions of the muffler facing the portions of the mu... | 05/23/1989 |
| 4756230 | Sound attenuator for pneumatic motors A reciprocating piston and cylinder pneumatic motor with a sound-reducing system that diffuses exhausting air by directing it across the curved outer surface of the cylinder.... | 07/12/1988 |
| 4686877 | Liquid jet cutting machine for cutting workpieces, especially flat workpieces The liquid jet cutting machine contains at least one cutting head provided with an apparatus for producing high-pressure liquid at pressures in excess of 1000 bar. The cutting head delivers a high-pressure liquid cutting jet and is preferably movable or g... | 08/18/1987 |
| 4609067 | Heat shield for a vehicular muffler A vehicular muffler heat shield comprises at least one and preferably two longitudinally rigid, transversely flexible shield members. The shield members have muffler shell contacting, longitudinal ribs and raised, perforated shield panels. The shield memb... | 09/02/1986 |
| 4478310 | Universal heat shield A universal heat shield which may be varied in length and shape to fit a variety of mufflers, catalytic converters, and the like, is disclosed. A pair of metal sheets, each of which includes a pair of planar members intersecting at a crease line, a pair o... | 10/23/1984 |
| 4466605 | Stacking device for sheet material A stacking device for sheet material such as banknotes and receipts has a stacker drum with a suction opening at a predetermined location on the periphery. The suction opening grips the leading edges of the sheets to be stacked at a first tangential posit... | 08/21/1984 |
| 4450932 | Heat recovery muffler A heat recovery muffler comprising an outer body and having an annular heat exchanger disposed within the body and spaced from the ends thereof. The heat exchanger is provided with a central opening and an exhaust gas inlet pipe is located within the cent... | 05/29/1984 |
| 4422523 | Exhaust muffler cover An exhaust muffler cover for internal combustion engines having a piled buffering layer provided on the outer surface of a cover member surrounding the exhaust muffler body with a suitable gap therebetween. The cover member has a sufficiently reduced thic... | 12/27/1983 |
| 4375374 | Method and apparatus for transporting glass vessels In bottle transporting apparatus, noise resulting from bottles colliding with each other and noise emitted by the transport mechanism is suppressed by moving the bottles in a water bath which immerses the mechanism and at least partially immerses the bott... | 03/01/1983 |
| 4364594 | Railway wheel vibration damping device A vibration damping device for a body resonant at two frequencies, is formed by a plate which can be connected to the body transversely with respect to its vibration direction. A post extends from the plate and mounts one end of an elastically flexible to... | 12/21/1982 |
| 4355578 | Railway wheels and rails damping structures A system comprising a rail wheel and rail has the wheel and preferably also the rail provided with vibration dampers which absorb vibration having the frequency of the radial resonant vibration frequency of the wheel, for the purpose of preventing the for... | 10/26/1982 |
| 4346780 | Purging pipes under noise-attenuating conditions Noise attenuation during the purging of pipes by means of steam blowing is achieved by the use of a receptacle into which steam is blown upon discharge from one end of a pipe; a linkage pivotally suspends an exchangeable mouthpiece adjacent to a front end... | 08/31/1982 |
| 4335797 | Noise suppression arrangement for engine enclosures An engine enclosure (10) has a noise suppression arrangement (15,15a,15b) mounted thereon including a plurality of acoustical energy absorbers (20,20a,20b) and sound reflectors (24,24a,24b) spaced from the absorbers to provide airflow passages (26,26a,26b... | 06/22/1982 |
| 4334588 | Vehicle engine noise reducing assembly A noise reducing assembly, including a sound absorbing grille (30) with louvers (33) and a sound and air diverting unit (40) is used for noise control in an earthmoving vehicle (20). The sound absorbing grille (30) has a perforated panel (32) covering an ... | 06/15/1982 |
| 4298088 | Diffuser resonances For suppression of flow-driven resonances, a cross section modification is undertaken at the outlet of a diffuser. The length of the cross section modification stands in a specified relationship to the sonic wave to be suppressed.... | 11/03/1981 |
| 4284169 | Bubble noise reduction A method and apparatus for reducing acoustic noise associated with the release of gases from a submerged device, such as a sea water battery. A flat piece of material, preferably polyurethane, is mounted onto the top of the device. The piece of material i... | 08/18/1981 |
| 4279325 | Acoustic treatment for fans Apparatus for attentuating noise emitted from an inlet port to a centrifugal fan comprises a panel member which is mounted in spaced confronting relationship to the inlet port and includes a rigid backing member, a facing mounted in spaced disposition fro... | 07/21/1981 |
| 4265332 | Heat extracting muffler system A muffler system positioned within the engine housing of the vehicle such as a garden tractor, includes a muffler surrounded by an open ended tubular heat shield having a venturi tube on its outer end which receives and accelerates the exhaust gases to cr... | 05/05/1981 |
| 4174020 | Acoustic treatment for fans A centrifugal fan is treated acoustically by the provision of tuned noise absorption cavities preferably including absorbent infill between an acoustically permeable scroll and casing of the fan. Alternatively, or in addition an acoustically absorbent pan... | 11/13/1979 |
| 4122908 | Fan noise suppressor and baffle A power unit including a liquid-cooled engine, a radiator in fluid communication with the engine for cooling engine coolant, a fan on one side of the radiator for directing air therethrough, and a noise suppressing baffle on the other side of the radiator... | 10/31/1978 |
| 4121683 | Noise silencer assembly A noise silencer covering an air discharge opening in front of a radiator is used for noise control for an earthmoving vehicle. The silencer encloses a radiator grill which is removably attached to a forward end of an engine enclosure. The noise silencer ... | 10/24/1978 |
| 4113049 | Noise reduction device for impact tools A noise reduction device for use with an impact tool which comprises a deformable block having a flat face and an opening therein for accepting the set of the tool, and a cylindrical housing extending from the block and sealed about the tool, with an open... | 09/12/1978 |
| 4074737 | Wood planer cutterhead design for reduced noise level A helical cutterhead for a wood planer for reducing noise level during planing by supressing vibration and sound radiation by having more than one knife blade engaged in the workpiece at any instant by satisfying the minimum condition of the formula L=πD... | 02/21/1978 |
| 4046219 | Exhaust silencer apparatus for internal combustion engine A tuned pipe exhaust for a two cycle internal combustion engine for snowmobiles and the like includes a conically shaped converging megaphone section terminating in a small end tube. An absorptive spiral muffler unit is co-axially secured to the end tube ... | 09/06/1977 |
| 4037667 | Blower for edger A blower apparatus for a plant cutter including a hollow member affixed to conduct exhaust gases from the cutter. The hollow member conducts exhaust gases from the plant cutter to a connected rotatable hollow member and through a terminal opening in the r... | 07/26/1977 |
| 4032310 | Muffler and exhaust gas purifier for internal combustion engines Internal combustion engine exhaust gas muffler and purifier with segmented hollow shell and removable middle segment, said shell having an upstream exhaust gas expansion chamber, a downstream sound-absorbing and sound-collecting chamber, and a middle, rem... | 06/28/1977 |
