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 Title: |
US4127130:
Air muffler
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Naysmith, Kenneth D.; Wyandotte, MI 48192
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| Assignee: |
None
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| Published / Filed: |
1978-11-28
/ 1977-06-02
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| Application Number: |
US1977000802608
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| IPC Code: |
Advanced:
A62B 17/04;
Core:
A62B 17/00;
IPC-7:
A62B 17/04;
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| ECLA Code: |
A62B17/04;
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| U.S. Class: |
Current:
128/201.25;
055/380;
096/380;
181/224;
181/230;
181/258;
181/292;
285/397;
Original:
128/142.7;
128/142.3;
181/230;
181/258;
181/224;
181/292;
055/276;
055/380;
285/397;
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| Field of Search: |
128/142.7,142.3,142.4,145.6
181/230,224,258,292
055/276,380
285/417,397,398
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| Priority Number: |
| 1977-06-02 |
US1977000802608 |
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| Abstract: |
The air muffler is primarily designed to be carried by a snug fitting hood respirator adapted to fit over the head of a person and to dispense breathable air into the hood in a minimum quantity of at least four cubic feet per minute, with a controlled noise level not to exceed 80 decibels, and with varying air pressure of from 11 to 25 pounds per square inch. The muffler utilizes a non-absorbent porous resilient fibrous filter media within a tubular casing provided with a series of ports, with the casing located entirely within a bag made from a non-absorbent porous fibrous material. An air pocket is provided between the portion of the casing provided with the ports and the bag. The air is directed from the source through the casing where it is restricted as it passes through the non-absorbent porous filter media prior to escaping through the ports in the casing into the air pocket where the air is muffled and is finally discharged into the hood through the porous fibrous bag.
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| Attorney, Agent or Firm: |
Cullen, Sloman, Cantor, Grauer, Scott & Rutherford ;
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| Primary / Asst. Examiners: |
Recla, Henry J.;
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| Family: |
None
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First Claim:
Show all 18 claims |
What is claimed is:
1. A muffler adapted to be connected to a source of air comprising a flexible tubular elongated casing having an axis, said casing having an opened end and a closed end and being divided into an outer zone and an inner zone throughout the length of said casing, said inner zone and said outer zone being located adjacent said closed end and opened end of said casing respectively, the wall of said casing surrounding said inner zone being provided with a series of ports which are spaced apart, a non-absorbent porous resilient fibrous filter media located within and throughout the inner zone of said casing, a fitting for said outer zone having one end mounted in the opened end of said casing and the opposite end extending therefrom in an axial direction away from said casing and adapted to be secured to the source of air, a bag closed at the one end and opened at the other end and made from a non-absorbent porous fibrous material, said casing extending into said bag through the opened end thereof, said bag and said casing cooperating to form an air pocket in said bag surrounding generally the inner zone of said casing, and a clamp surrounding and engaging said bag and overlying said fitting, said clamp securing said bag to the outer zone of said casing thus closing said air pocket, the air directed into said casing from the source being initially restricted as it passes through the non-absorbent porous filter media prior to escaping through the ports in said casing into said air pocket where the air is muffled and discharged through the porous fibrous bag.
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| Background / Summary: |
Show background / summary
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| Drawing Descriptions: |
Show drawing descriptions
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| Description: |
Show description
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| Forward References: |
Show 11 U.S. patent(s) that reference this one
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