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

[0015] It is therefore an object of the present invention to provide a sound adjustable device which enables a user to quickly and easily vary the sound volume of a motorcycle while the motorcycle is either stationary or in motion, and wherein the internal components of the sound adjustable device shield the casing of the sound adjustable device from the heat of the exhaust.

[0016] The subject invention results from the realization that a sound adjustable device including two slotted pipes, one positioned within the other, can affect the sound volume of the exhaust-noise by moving one of the slotted pipes with respect to the other so as to either align or misalign the slots of the respective pipes. Completely aligning the slots of the inner slotted pipe and the slots of the outer slotted pipe maximizes the amount of exhaust-noise to be exposed to a sound-dampening material surrounding the outer slotted pipe, thereby minimizing exhaust-noise. 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 size of the openings formed by the combination of the slots of the inner and outer slotted pipes, in proportion to the misalignment of the slotted pipes, thereby increasing the amount of exhaust-noise. Furthermore, the subject invention also results from the realization that a sound adjustable device with components including heat-resistant or heat-shielding properties, for example a casing that includes a heat-shielding material as well as slotted pipes including heat-resistant materials, will effectively reduce the amount of heat to which the casing is exposed.

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 size of the openings formed by the combination of the slots of the inner and outer slotted pipes, in proportion to the misalignment of the slotted pipes, thereby increasing the amount of exhaust-noise.

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