Sound adjustable device for coupling to an engine and method for manufacturing thereof

Abstract

A sound adjustable device that varies exhaust-noise having a casing including a sound-dampening material that dampens exhaust-noise, an outer slotted pipe inside the casing, an inner slotted pipe inside the outer slotted pipe, and wherein at least one of the outer and inner slotted pipes is movable with respect to the other to alternately align the slots of the respective slotted pipes for a quieter exhaust-noise and to misalign the slots of the respective slotted pipes for a louder exhaust-noise. The sound adjustable device may also include a heat-shielding material inserted between the casing and the sound-dampening material to shield the casing from heat emitted by the exhaust, and a heat-resistant material may be included in the inner and outer slotted pipes.

Description

RELATED APPLICATION [0001] This application claims the benefit of U.S. patent application No. 60 / 794367 filed Apr. 24, 2006, the contents of which are incorporated by reference in their entirety.BACKGROUND OF THE INVENTION—FIELD OF INVENTION [0002] The present invention relates to devices for varying the sound volume of exhaust-noise emitted from internal combustion engines, and more specifically for engines of the type commonly used on motorcycles, recreational vehicles or other vehicles. BACKGROUND OF THE INVENTION [0003] Conventional mufflers, for example motorcycle mufflers, consist of a perforated metal pipe wrapped in a sound-absorbing material which is contained within a metal or chrome casing. Conventional mufflers are connected to a motorcycle's engine by an exhaust pipe, which conveys the exhaust and exhaust-noise from the motorcycle's engine to the conventional muffler. The exhaust and exhaust-noise are then conveyed into a sound-absorbing material surrounding the perfora...

AI Technical Summary

Benefits of technology

[0028] In another embodiment, as shown in FIG. 12, a first motor 27, in communication with a switch 25, attaches to the collar 60 and moves the peg 84. The peg 84, as shown in FIG. 8, attaches to the inner slotted pipe 50 causing the inner slotted pipe 50 to move with respect to the outer slotted pipe 40. In this way, when the switch 25, shown in FIG. 12, communicates a signal to the first motor 27, the first motor 27 moves the peg 84, which moves the inner slotted pipe 50 with respect to outer slotted pipe 40, thereby either aligning or misaligning the slots 48 and 56 of the slotted pipes 40 and 50, and either respectively decreasing or increasing the sound volume of the exhaust-noise.

[0029] In another embodiment, as shown in FIG. 13, the first motor 27 attaches to the collar 60 and moves the peg 84. The peg 84

Problems solved by technology

Increasingly misaligning the slots of the inner slotted pipe and the outer slotted pipe decreases the amount of exhaust-noise exposed to the sound-dampening material by proportionally decreasing the s

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