Patent US3880252A successfully refreshed from Google Patents.
US3880252A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Muffler
Assignee: HK Porter Co Inc
•
Filing: 1974-07-01
•
Granted: 1975-04-29
•
Expires: 1994-07-01
Abstract
Abstract An exhaust muffler for internal combustion engines and compressed air tools or other air-operated machinery has a tubular core normally closed at one end, with a connecting portion at its other end for connecting the core to a source of exhaust gases to be discharged. Intermediate its two ends the length of the core is perforated lengthwise and peripherally, providing numerous parts through which the exhaust gases are discharged radially. A succession of dished or concavo-convex annuli are fitted about the perforated area of the core with alternate annuli reversed so that they are formed into pairs with the concave surfaces of the annuli confronting each other, the spaces between the several pairs of annuli providing attenuation chambers into which the gases flowing out of the core are discharged. The confronting edges of one or both annuli have projections thereon so arranged that there is a substantially continuous outlet space for gases around the periphery of each chamber. The series of annuli are confined between abutments at opposite ends of the tube which jam them against each other while the projections prevent the converging edges from making full edge-to-edge contact.
Inventors
- 👤 John R Mucka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:04
CPC Classifications
F; F01; F01N; F01N13/00; F01N13/18; F01N13/1872; F01N13/1877; F01N1/00; F01N1/08; F01N1/16; F01N13/011; F01N13/1838; F01N13/1844; F01N13/1855; F01N13/1888; F01N13/1894; F01N2450/00; F01N2450/24; F01N2470/00; F01N2470/02; F01N2470/04; F01N2470/06; F01N2470/14; F01N2470/18
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
322 words
A muffler for suppressing the exhaust noises of internal combustion engines and air-driven machinery comprising: a. a straight tubular body having means at one end for connecting it to the exhaust of an internal combustion or airdriven motor and having a closure at its other end, a length of the tubular body intermediate its ends being of uniform diameter and having perforations therein extending lengthwise and circumferentially of the body, b. a series of dished annuli on the tubular body over said perforated length of the tubular body, each annulus being of concavo-convex shape with a central opening through which the tube is slidably passed, said annuli being arranged in several pairs in which the concave surfaces of the annuli of each pair are in confronting relation and the peripheral edges of the concave surfaces of the two annuli converge toward a common plane and the central areas of the outer surfaces of the annuli are in back-to-back contact, each such pair providing an attenuation chamber with opposing concave walls around the tubular body extending from the exterior of the tubular body to the periphery of the pair of annuli, said attenuation chambers and the openings in the tubular body being so disposed as to introduce gases from the tubular body into each attenuation chamber both at its mid plane and on at least one side of said mid plane, c. at least one annulus of each pair having a plurality of projections about its edge which contact the confronting edge of the other annulus of the pair to prevent full edge-to-edge contact between the two annuli of the pair to assure clearance space for the discharge of gases from around the periphery of the chamber formed between said annuli of each pair, all of the annuli being jammed tightly together by tightening them between two abutments secured to the tubular body, the clearance space so provided opening directly into the atmosphere.
Claim 2
Dependent Claim
322 words
A muffler for suppressing the exhaust noises of internal combustion engines and air-driven machinery comprising: a. a straight tubular body having means at one end for connecting it to the exhaust of an internal combustion or airdriven motor and having a closure at its other end, a length of the tubular body intermediate its ends being of uniform diameter and having perforations therein extending lengthwise and circumferentially of the body, b. a series of dished annuli on the tubular body over said perforated length of the tubular body, each annulus being of concavo-convex shape with a central opening through which the tube is slidably passed, said annuli being arranged in several pairs in which the concave surfaces of the annuli of each pair are in confronting relation and the peripheral edges of the concave surfaces of the two annuli converge toward a common plane and the central areas of the outer surfaces of the annuli are in back-to-back contact, each such pair providing an attenuation chamber with opposing concave walls around the tubular body extending from the exterior of the tubular body to the periphery of the pair of annuli, said attenuation chambers and the openings in the tubular body being so disposed as to introduce gases from the tubular body into each attenuation chamber both at its mid plane and on at least one side of said mid plane, c. at least one annulus of each pair having a plurality of projections about its edge which contact the confronting edge of the other annulus of the pair to prevent full edge-to-edge contact between the two annuli of the pair to assure clearance space for the discharge of gases from around the periphery of the chamber formed between said annuli of each pair, all of the annuli being jammed tightly together by tightening them between two abutments secured to the tubular body, the clearance space so provided opening directly into the atmosphere.
Claim 3
Dependent Claim
266 words
A muffler comprising a straight tube of uniform inside diameter having means at one end for connecting it with a source of exhaust gas to be muffled and closure means at the opposite end, a succession of concavo-convex annuli fitted on and supported by the tube in contacting back-to-back relation, each annulus being reversed with respect to the adjacent ones to form pairs having confronting concave surfaces with the peripheral edge portions of confronting annuli converging, each pair of annuli forming an annular chamber between them extending from the exterior of the tube to the converging edges thereoF, means for holding said converging edges of each such pair spaced from each other to form an opening substantially around the periphery of each chamber between the confronting edges, said tube having openings around its periphery and along its length arranged to discharge exhaust gases from the tube into each chamber in a plurality of transverse planes with one complete annular ring of such openings being centered on the mid-plane between the two confronting annuli of each pair, the area of the peripheral opening around each pair of annuli being no less than the combined areas of the openings leading from the tube into each chamber whereby gases flowing from the tube into each chamber may escape freely around the periphery to the atmosphere, said opening around the periphery of each chamber discharging directly to the atmosphere, and means for fixing the annuli in predetermined position relative to one another on the tube and restraining them against longitudinal or relative rotating motion during the operation of the muffler.
Claim 4
Dependent Claim
266 words
A muffler comprising a straight tube of uniform inside diameter having means at one end for connecting it with a source of exhaust gas to be muffled and closure means at the opposite end, a succession of concavo-convex annuli fitted on and supported by the tube in contacting back-to-back relation, each annulus being reversed with respect to the adjacent ones to form pairs having confronting concave surfaces with the peripheral edge portions of confronting annuli converging, each pair of annuli forming an annular chamber between them extending from the exterior of the tube to the converging edges thereoF, means for holding said converging edges of each such pair spaced from each other to form an opening substantially around the periphery of each chamber between the confronting edges, said tube having openings around its periphery and along its length arranged to discharge exhaust gases from the tube into each chamber in a plurality of transverse planes with one complete annular ring of such openings being centered on the mid-plane between the two confronting annuli of each pair, the area of the peripheral opening around each pair of annuli being no less than the combined areas of the openings leading from the tube into each chamber whereby gases flowing from the tube into each chamber may escape freely around the periphery to the atmosphere, said opening around the periphery of each chamber discharging directly to the atmosphere, and means for fixing the annuli in predetermined position relative to one another on the tube and restraining them against longitudinal or relative rotating motion during the operation of the muffler.
Claim 5
Dependent Claim
63 words
A muffler as defined in claim 2 in which said last-named means comprises an abutment on the tubular body at each end of said succession of annuli for confining them over the length of the tubular core in which the annular openings are formed, at least one such abutment being threaded on the tubular body for adjustment toward and away from the other.
Claim 6
Dependent Claim
44 words
A muffler as defined in claim 3 in which both of said abutments are threaded onto the tubular body whereby the entire succession of annuli may be adjusted lengthwise of the perforated length of the tube while holding them in operation tightly jammed together.
References Cited (Backward Citations)
US734749A
Cited
US1162064A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-28 | 1978-10-28 | 1979-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-28 | 1982-10-28 | 1983-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-28 | 1986-10-28 | 1987-04-29 | $7700.00 | Window Closed / Lapsed |