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Publication numberUS3788072 A
Publication typeGrant
Publication dateJan 29, 1974
Filing dateMay 3, 1972
Priority dateMay 3, 1972
Publication numberUS 3788072 A, US 3788072A, US-A-3788072, US3788072 A, US3788072A
InventorsE Burger
Original AssigneeFord Motor Co
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Rain cap for exhaust pipe
US 3788072 A
Abstract
A rain cap for a vertical exhaust of an internal combustion engine is formed of an open-ended cylindrical body larger than the exhaust pipe and having a pivotally mounted cover opened by exhaust gases and closed by gravity. Portions struck from the body support it from the exhaust pipe.
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Description  (OCR text may contain errors)

United States Patent 1 1 1111 3,788,072

Burger Jan. 29, 1974 RAIN CAP FOR EXHAUST PIPE 2,728,408 12/1955 Deliman 60/319 [75] Inventor: Edgar P. Burger, Detroit, Mich.

Primary ExaminerDouglas Hart [73] Assignee Motor m Dearbom Attorney, Agent, or Firm-William E. Johnson; Keith L. Zerschling [22] Filed: May 3, 1972 [52] U 8 Cl 60/324 98/59 A rain cap for a vertical exhaust of an internal com- [51] i 7/02 bustion engine is formed of an open-ended cylindrical 58] Fie'ld 60/324 319, 98/59 body larger than the exhaust pipe and having a pivotally mounted cover opened by exhaust gases and [56] References Cited closed by gravity. Portions struck from the body sup- UNITED STATES PATENTS port it from the exhaust pipe. 2,420,700 5/ 1947 Curphy 60/324 1 Claim, 3 Drawing Figures RAIN CAP FOR EXHAUST PIPE This invention relates to rain caps for vertical, upwardly directed exhaust pipes for internal combustion engines.

Vertical exhausts usually are provided with rain caps to prevent the entrance of rain and foreign matter at times when the engine is not being operated. These rain caps are usually gravity-biased to closed position, the stream of exhaust gas during operation of the engine opening the cap against its bias and holding it open.

In the cap of the present invention, a cap or cover is pivotally mounted in a cylindrical body which is of somewhat larger diameter than the exhaust pipe to leave an annular space for rain dripping from the edge of the cover to drain downwardly along the outside of the exhaust pipe. The body is formed as an open-ended sheet metal cylinder having diametrically opposite slit portions displaced inwardly at the bottom of the body to engage the exhaust pipe and support the body.

Among the objects of the present invention are to provide an improved rain cap for vertical exhausts which is simple, easy and economical to manufacture, which may easily be attached to a vertical exhaust and which is rugged and dependable in operation.

Other objects, and objects relating to details of construction and use will be more apparent from the detailed description to follow.

This invention is clearly defined in. the appended claims. In the claims, as well as in the description, parts may at times be identified by specific names for clarity and convenience, but such nomenclature is to be understood as having the broadest meaning consistent with the context and with the concept of this invention as distinguished from the pertinent prior art. The best form in which has been contemplated applying this invention is illustrated in the accompanying drawings forming part of this specification in which:

FIG. 1 is a perspective view of the rain cap of the present invention applied to an exhaust pipe, a portion of the body being broken away;

FIG. 2 is a vertical section through cap and exhaust pipe end; and

FIG. 3 is a horizontal section taken on the line 3-3 of FIG. 2.

Referring now to the drawings, the rain cap assembly of the present invention comprises a cylindrical body which is made of sheet metal and has open top and bottom ends. The diameter of the body 10 is somewhat larger than the diameter of the vertically upwardly extending exhaust pipe II to leave an annular space 12 between the body and the outside wall of the exhaust pipe. A circular cover 14 of diameter somewhat larger than the diameter of the exhaust pipe is mounted in the upper portion of the body on a horizontal pivot 15 extending from side to side of and supported by the body 10. The pivot 15 is offset a short distance from the center of the cover 14 so that the cover will be gravitybiased in a direction to close the exhaust pipe 11 when the vehicle engine is not in use.

A tab 16 is struck inwardly from the wall of the body 10 to form a stop limiting rotation of the cover 14 to a generally horizontal position at which time it overlies the open end of the exhaust pipe 11. A second tab 17 struck inwardly from the body 10 limits opening movement of the cover 14. The tab 17 is positioned to permit the cover 14 to rotate most of the way towards the open position, as shown in the drawings.

The body 10 is mounted concentric to the upper end of the exhaust pipe 11 by a pipe of inwardly displaced portions 19 struck from the lower edge of the body 10. These portions are formed by slitting body 10 at 21 on diametrically opposite sides of the body and then forming the portions 19 into arcuate confronting portions adapted to engage the outside of the exhaust pipe 11 a short distance below its upper end. If desired, a self tapping bolt 24 may be engaged with each of the portions 19 and the exhaust pipe to clamp the body 10 in position on the exhaust pipe.

In operation, immediately upon starting the internal combustion engine, the current of exhaust gases exiting from the exhaust pipe 11 will press against the underside of the cover 14 to rotate it to open position against the tab 17. The cover will remain in open position until the engine is shut off, at which time under the force of gravity the cover will rotate to closed position against the tab 16.

In closed position, the cover 14, which is somewhat larger in diameter than the exhaust pipe 11, will prevent direct entrance of rain into the exhaust pipe. Water dripping from the edges of the cover 14 will pass downwardly through the annular space 12 between the body and the outside of the exhaust pipe and thus will not enter into the exhaust pipe and into the engine. The body 10 will protect the cover 14 and its pivot 15 from damage.

I claim:

1. A rain cap for a vertical upwardly directed internal combustion engine exhaust pipe, said cap comprising a cylindrical body having both ends open and having a diameter somewhat larger than the diameter of the exhaust pipe, a lower edge portion of said cylindrical body being split at opposite sides parallel to said lower edge portion and displaced inwardly and formed to provide two confronting arcuate portions adapted to engage the outside of the exhaust pipe a short distance below its upper end to support said cylindrical body generally concentrically on the upper end of the exhaust pipe with the upper end of said cap projecting 7 beyond the end of the exhaust pipe with the space be-

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2420700 *Oct 18, 1944May 20, 1947William C CurphyExhaust pipe attachment
US2728408 *Dec 11, 1953Dec 27, 1955George DelimanAutomobile accessory for burning exhaust gases
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4143731 *Dec 22, 1977Mar 13, 1979General Motors CorporationExhaust flow directional device
US4159078 *Mar 7, 1978Jun 26, 1979Werner DiermayerDraft control arrangement for combustion apparatus
US4198817 *Mar 1, 1978Apr 22, 1980Toyota Jidosha Kogyo Kabushiki KaishaExhaust gas diffuser
US4603619 *Feb 8, 1983Aug 5, 1986Andre AmphouxFlue terminal gas extractor
US4667582 *May 12, 1986May 26, 1987Davison Jerome GDynamically balanced exhaust pipe cap
US4742766 *Feb 27, 1987May 10, 1988Davison Jerome GDynamically balanced exhaust pipe cap
US4821629 *May 4, 1988Apr 18, 1989Davison Jerom GDynamically balanced exhaust pipe cap
US4827715 *Nov 30, 1987May 9, 1989Caterpillar Inc.Crankcase fumes disposal system
US4903484 *May 8, 1989Feb 27, 1990Yates Clyde IExhaust dissipator and deflector
US4970859 *Feb 20, 1990Nov 20, 1990Yates Clyde IExhaust gas deflector for truck exhaust stacks
US5259411 *Nov 2, 1992Nov 9, 1993The Field Controls Division Of Heico, Inc.Flow control
US5722235 *Aug 26, 1996Mar 3, 1998Ccl, Inc.Exhaust gas back pressure attenuator for truck exhaust stacks
US6527006Jul 2, 2001Mar 4, 2003Arvinmeritor, Inc.Exhaust valve assembly
US6732511 *Oct 19, 2001May 11, 2004Faurecia Abgastechnik GmbhExhaust flap
US6921327Sep 29, 2003Jul 26, 2005Richard UrashExhaust pipe cover
US7566355 *Nov 9, 2005Jul 28, 2009William GaskinsVent protector device for exhaust vents of buildings
US7779961 *Nov 20, 2007Aug 24, 2010Matte FrancoisExhaust gas diffuser
US7913489Nov 14, 2007Mar 29, 2011Tenneco Automotive Operating Company, Inc.Device for lowering tail pipe exhaust temperature
US7942447Dec 30, 2005May 17, 2011American Off-Road Technologies, LlcFrame design for reduced-size vehicle
US7954853Dec 30, 2005Jun 7, 2011American Off-Road Technologies, LlcReduced-size vehicle with complementary internal compartments and suspension system components
US8056673 *Jul 13, 2010Nov 15, 2011Compx International Inc.Sound dampening and wear protecting flapper configuration for marine exhaust system
US8191677 *Jan 8, 2010Jun 5, 2012American Off-Road Technologies, LlcExhaust and cooling systems for implementation in reduced-size vehicle
US8191929Feb 5, 2010Jun 5, 2012American Off-Road Technologies, LlcReduced-size vehicle with large internal voids
US8191930Apr 25, 2011Jun 5, 2012American Off-Road Technologies, LlcFrame design for reduced-size vehicle
US8550053 *Aug 23, 2005Oct 8, 2013Pierburg GmbhExhaust flap housing as well as an exhaust flap means
US8622428Jun 4, 2012Jan 7, 2014American Off-Road Technologies, LlcReduced-size vehicle with large internal voids
DE2804428A1 *Feb 2, 1978Aug 9, 1979Kloeckner Humboldt Deutz AgBrennkraftmaschine mit senkrecht oder etwa senkrecht nach oben fuehrendem auspuffrohr
DE3008170A1 *Mar 4, 1980Sep 17, 1981Kloeckner Humboldt Deutz AgBrennkraftmaschine mit senkrecht oderetwa senkrecht nach oben fuehrendem auspuffrohr
DE19755617B4 *Dec 13, 1997Feb 27, 2014TROX TLT GmbHStrömungskanal
DE102004051627B4 *Oct 23, 2004Jul 1, 2010Pierburg GmbhAbgasklappeneinrichtung
EP1630370A1 *Jul 28, 2005Mar 1, 2006Pierburg Instruments GmbHExhaust gas flap housing and exhaust gas flap device
WO1989005394A1 *Sep 16, 1988Jun 15, 1989Caterpillar IncCrankcase fumes disposal system
Classifications
U.S. Classification60/324, 454/5, 454/2
International ClassificationF01N13/08
Cooperative ClassificationF01N13/085
European ClassificationF01N13/08C