The present invention relates to a muffler exhaust tip with radially inboard protrusions to alter exhaust flow and exhaust noise.
BACKGROUND OF THE INVENTION
There are numerous silencers and muffler exhaust tips available on the market for vehicle owners that want to customize their vehicles. Most of the aftermarket exhaust tips on the market are decorative in nature given that the exhaust tip is usually the only part of the engine muffler system that is visible to ordinary observers. U.S. Pat. No. 6,085,863 to Shuen, U.S. Design Pat. No. 413,296 to Hussaini, U.S. Design Pat. No. 384,319 to Harutiunian, U.S. Design Pat. No. 191,509 to Feinberg, and U.S. Design Pat. No. 164,960 to Russell, disclose a decorative exhaustion pipe.
U.S. Pat. No. 6,006,859 to Hussaini discloses a decorative muffler exhaust tip that serves to amplify exhaust noise.
U.S. Pat. No. 4,354,573 to Tabata, et al., and U.S. Pat. No. 5,831,223 to Kesselring, disclose an exhaust piece that serves to further silence the noise from the exhaust of the engine to which the muffler system is connected.
Others, such as U.S. Design Pat. No. 189,573 to Russell, and U.S. Design Pat. No. 133,788 to Koch, disclose a tailpipe tip that diverts the exhaust in a particular direction
Some, such as U.S. Pat. No. 3,043,097 to Inman, et al., and U.S. Design Pat. No. 247,360 to Hamaguchi, et al., disclose exhaust tips that channel air from around the muffler exhaust tip in a manner that creates a negative pressure on the muffler system when the vehicle is in motion.
U.S. Pat. No. 2,630,835 to Russell discloses a clamping means for an exhaust tail pipe.
None of the prior muffler exhaust tips provide internal protrusions or ridges which direct the exhaust in a predetermined manner and which also provide baffling such that the exhaust noise is modified to create a unique audio or acoustic signature. In addition, none of the prior exhaust tips provide inboard protrusions to reduce or control turbulence and to promote smoother exhaust flow through the muffler exhaust tip.
Objects of the Invention
It is an object of the present invention to provide a muffler exhaust tip with an inner sleeve defining and carrying a plurality of radially inboard protrusions which serve to alter and control exhaust flow through the muffler exhaust tip.
It is a further object of the present invention to provide a muffler exhaust tip with an inner sleeve carrying a plurality of radially inboard ridges which alter exhaust flow through the muffler exhaust tip such that exhaust noise is modified to create a unique acoustic signature.
It is a further object of the present invention to provide a muffler exhaust tip with a baffling interspace between outer and inner sleeves and in which the inner sleeve includes radially inboard protruding ridges which serve to modify exhaust noise to create a unique audio signature.
It is another object of the present invention to provide a muffler exhaust tip having inboard protrusions to reduce or control turbulence and to promote exhaust flow through the muffler exhaust tip in a predetermined manner.
It is a further object of the present invention to provide a muffler exhaust tip that may be attached to a vehicle tailpipe that has an outer cylindrical sleeve having a tapered end and an inner cylindrical sleeve defining radially inboard ridges with baffling space defined between the outer and inner sleeves.
SUMMARY OF THE INVENTION
A muffler exhaust tip for a vehicle having a muffler tailpipe includes a substantially hollow, cylindrical muffler tip member with an inboard end adapted to be affixed to the tailpipe and an outboard end. The hollow, cylindrical member is defined by an elongated outer sleeve and a coaxial, perforated inner sleeve which jointly define a baffle interspace therebetween. The inner sleeve carries a plurality of radially inboard protrusions to alter exhaust flow through the muffler exhaust tip. The altered exhaust flow, together with the baffling properties of the baffle interspace, serve to create a unique audio signature.
The perforated inner sleeve of the cylindrical member may define a pattern of holes. In addition, the baffle interspace may include a layer of fire retardant sound baffling material. In one embodiment, the plurality of inboard protrusions define a helix extending through part of the inner sleeve. In another embodiment, part of the outer sleeve of the muffler tip includes a conical reducer such that the inboard end more closely matches the dimensions of the tailpipe of the vehicle.
FIG. 2 diagrammatically illustrates a cross-sectional view of the exhaust tip 10 in FIG. 1. Outer sleeve 40 is substantially cylindrical, having a tapered inboard end 42 which is affixed to the tailpipe 26 of the vehicle. In FIG. 2, the exhaust tip 10 is affixed to the end of tailpipe 26 via clamp 24. Clamp 24 includes tightening screw 28 which is used to cause radial movement of the clamp 24 such that turning screw 28 clockwise causes clamp 24 to move radially inboard, trapping the tailpipe 26 between the radially inboard surface of outer sleeve 40 and the clamp 24. Other means to affix muffler exhaust tip 10 to tailpipe 26 may also be used, including simple set screws, weld or solder, exterior clamp, threads on the tailpipe and exhaust tip, or an interference fit. This list is merely exemplary. FIG. 3 illustrates the muffler exhaust tip 10 installed on a vehicle 14. FIG. 5 diagrammatically illustrates exhaust tip 10 with a plurality of clamps 24 a, 24 b.
In FIG. 2, perforated inner sleeve 50 defines a pattern of holes 52. Inner sleeve 50 also carries a plurality of radially inboard protrusions 70, 72, 74. The protrusions 70, 72, 74 define lands or rounded ridges which alter the exhaust flow through the muffler tip 10 during operation of the vehicle's engine. In FIGS. 1 and 2, the plurality of protrusions 70, 72, 74 define a spiral or helix extending longitudinally through part of inner sleeve 50. In another embodiment, inner sleeve 50 carries six rounded ridge protrusions 72, 74, 76, 78, 80, 82 such that two 74, 80 extend substantially across the longitudinal aspect of inner sleeve 50 with two shorter length protrusions on either side (see FIG. 6). FIG. 6 diagrammatically illustrates inner sleeve 50 spread out on a plane showing the diagonal pattern of protrusions 72-82 which form the helix or spiral.