US4055231A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silencer for internal combustion engines
Assignee: Individual
•
Filing: 1975-10-14
•
Granted: 1977-10-25
•
Expires: 1995-10-14
Abstract
Abstract The application discloses a new silencer for internal combustion engines. This silencer comprises an internal resilient tube capable to vibrate longitudinally and permeable to the exhaust gas and an external sheath. An end piece closes the internal tube. Spacers are secured to the internal tube and another end piece provided with apertures is secured to the end of the external sheath. The exhaust gases exit from the internal tube through the space comprised between the spacers and the external sheath towards said apertures in the other end piece.
Inventors
- 👤 Ginez Martinez
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:21
CPC Classifications
F; F01; F01N; F01N1/00; F01N1/16; F01N1/22
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
171 words
A silencer for an internal combustion engine, comprising: a supple resilient internal tube, adapted to vibrate longitudinally under the influence of the exhaust gas and permeable to said gas, receiving the exhaust gas from said engine; an elastic external sheath which is substantially not supple and not adapted to vibrate longitudinally and substantially not permeable to the gas, said sheath being substantially coaxial with the internal tube; an end piece closing the internal tube at the end opposite to the inlet of the exhaust gas therein; washers or spacers slideably secured to the internal tube at irregular intervals and permitting the gas to pass in the annular space comprised between the washers or spacers and the external sheath; an end piece secured to the end of the external sheath opposite to the inlet of the gas and provided with apertures for the output of the exhaust gas; and an expansion chamber between the end piece closing the internal tube and the end piece secured to the end of the external sheath.
Claim 2
Dependent Claim
171 words
A silencer for an internal combustion engine, comprising: a supple resilient internal tube, adapted to vibrate longitudinally under the influence of the exhaust gas and permeable to said gas, receiving the exhaust gas from said engine; an elastic external sheath which is substantially not supple and not adapted to vibrate longitudinally and substantially not permeable to the gas, said sheath being substantially coaxial with the internal tube; an end piece closing the internal tube at the end opposite to the inlet of the exhaust gas therein; washers or spacers slideably secured to the internal tube at irregular intervals and permitting the gas to pass in the annular space comprised between the washers or spacers and the external sheath; an end piece secured to the end of the external sheath opposite to the inlet of the gas and provided with apertures for the output of the exhaust gas; and an expansion chamber between the end piece closing the internal tube and the end piece secured to the end of the external sheath.
Claim 3
Dependent Claim
33 words
A silencer according to claim 1, wherein means are provided for partially occluding the apertures of said end piece of said external sheath, whereby the acoustic frequency spectrum of the silencer is adjustable.
Claim 4
Dependent Claim
51 words
A silencer according to claim 1 wherein the internal tube is constituted of an helical winding of a metallic strip, said strip being shaped in order that the tube is capable to vibrate longitudinally and the exhaust gas can escape through the interstices of the winding, as shown in FIG. 2B.
Claim 5
Dependent Claim
46 words
A silencer according to claim 1, wherein the external sheath is constituted of an helical winding of a metallic strip, said strip being so shaped that it is substantially not permeable to the gas and substantially not liable to vibrate longitudinally, as shown in FIG. 3.
Claim 6
Dependent Claim
36 words
A silencer according to claim 1, including a damping material secured to a central interior portion of said end piece secured to the end of the external sheath, whereby shocks on said end piece are damped.
Claim 7
Dependent Claim
22 words
A silencer according to claim 1, including at least three washers or spacers slideably secured to the internal tube at irregular intervals.
References Cited (Backward Citations)
US1087397A
Cited
US2131001A
Cited
US2718273A
Cited
US2770313A
Cited
US3115210A
Cited
US3253676A
Cited
US3903928A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-10-24 | 1981-04-25 | 1981-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-24 | 1985-04-25 | 1985-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-24 | 1989-04-25 | 1989-10-25 | $7700.00 | Window Closed / Lapsed |