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Publication numberUS2482577 A
Publication typeGrant
Publication dateSep 20, 1949
Filing dateJul 8, 1946
Priority dateJul 8, 1946
Publication numberUS 2482577 A, US 2482577A, US-A-2482577, US2482577 A, US2482577A
InventorsRichard E Dahlstrom
Original AssigneeDonaldson Co Inc
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Rain trap for ventilating exhaust stacks
US 2482577 A
Abstract  available in
Previous page
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Claims  available in
Description  (OCR text may contain errors)

Patented Sept. 20, 1949 RAIN TRAP FOR VENTILATING EXHAUST STACKS Richard E. Dahlstrom, St. Paul, Minn., assignor to Donaldson Company, Inc., St. Paul, Minn., a corporation of Delaware Application July 8, 1946, Serial No. 682,099

1 Claim.

My invention relates to rain traps for vertical exhaust stacks and has for its object the provision for such a structure which is inexpensive to manufacture, which is durable and which is extremely efiicient as a rain trap, while imposing but a minimum restriction upon the exhaust stream.

The above and numerous other objects of my invention will become apparent from the following detailed specification, appended claim and attached drawings.

Referring to the drawings wherein like characters indicate like parts throughout the several views:

Fig. 1 is a plan View, some parts broken away and shown in section;

Fig. 2 is a vertical axial section taken on the line 22 of Fig. 1; and

Fig. 3 is a fragmentary sectional view taken on the line 3-3 of Fig. 2.

Referring with greater particularity to the drawings, the device illustrated therein comprises vertically-spaced, axial1y-a1igned,in1et and outlet tubes that are connected by a casing or housing 3, which is preferably, and as shown, of bulbular formation. The inlet and outlet tubes I and 2, respectively, define inlet and outlet passages, and the casing or housing 3 defines a chamber of somewhat greater diameter at its intermediate portion than the said inlet and outlet passages. The inlet tube I is adapted to be telescopically applied around the upper end of an exhaust stack of the engine of a tractor or the like, and is slotted at 4 to permit contraction thereof about the stack by means of a clamping band 5.

The upper end of the intake tube I is extended beyond the bottom of the casing 3 to provide therebelow and radially outwardly thereof, an annular moisture-collecting sump 6 Wherefrom collected moisture drains to atmosphere through a circumIerentially-spaced series of outlet ports I.

An inclined rain or other moisture-deflecting baiile 8, which is transversely concave to define an upwardly opening channel, is positioned within the casing 3 intermediate the upper end of inlet tube I and the lower end of outlet tube 2. The lower end of baffle 8 is secured to the inner wall of casing 3 below its intermediate portion, by welding or the like, and the upper end and sides of said baflle are spaced from the sides of the casing to permit free upward flow of exhaust gases therearound. The upper end of bafile 8 is rigidly supported above the intermediate portion of the casing 3 by means of a bracket 8a, which is Welded or otherwise secured to the inner side of easing 3 and to the under side of baflle 8. The baflle 8, as shown, is of a sufficient size to intercept any moisture which may drop downwardly through the outlet tube 2.

Adjacent its lower end, bailie 8 is provided with a transverse, elongated outlet port 9 which is centrally positioned with respect to the sides thereof. It will be seen, particularly by reference to Fig, 2, that moisture discharged through port 9 will drop vertically into the annular moisture-collecting sump 6 and from thence be discharged to atmosphere through outlet ports 1.

While the inlet and outlet tubes I and 2, and chamber 3 may take several forms, as shown, they are all formed of separate members which are Welded or otherwise secured together. Casing 3 is formed by two substantially semi-spherical halves 3a. and 3b, the latter of which is provided with a radially-outwardly-projecting circumferential flange 3c, and the former of which is provided with an inwardly-opening circumferential flange 3d, which closely embraces the flange 30.

It will be obvious from Fig. 2 of the drawings that as the exhaust gases, indicated by the unbroken arrows, pass upwardly through the chamber defined by the housing 3, the baffie 8 will impose a minimum of restriction thereupon because of its shape and inclined position. On the other hand, any rain or moisture which is indicated by the broken arrows, is efficiently intercepted and diverted.

What I claim is:

A rain trap for vertical exhaust stacks comprising a casing having vertically spaced coaxial inlet and outlet passages and defining a chamber of greater diameter than said passages, the inlet passage being in the bottom of the casing and the outlet passage being in the top of the casing, and a rigid inclined moisture intercepting bafile obliquely intersecting the axis of the casing and aligned inlet and outlet passages and anchored fast to the side of the casing at its lower end, the upper end and sides of the intercepting baffle being generally spaced from the casing to permit free upward fiow of exhaust gases between the inlet and outlet passages, said baflle defining an upwardly opening channel in transverse crosssection and being provided adjacent its lower end and in radially outwardly spaced relation from the inlet and outlet passages with a discharge port, said inlet being defined by an upstanding sleevelike portion projecting above the bottom of the chamber to provide radially outwardly thereof and below the discharge port of the baffle an annular moisture-collecting sump, and an outlet port in that portion of the casing wall forming the bottom of the moisture sump.


REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 786,555 Foster Apr. 4, 1905 1,009,573 Redding Nov. 21, 1911 1,695,308 Wilt Dec. 18, 1928 2,420,700 Curphy May 20, 194,?

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US786555 *Jul 11, 1904Apr 4, 1905James Harvey FosterStovepipe, flue, and smoke-stack protector.
US1009573 *Mar 24, 1911Nov 21, 1911Rufus Marion ReddingDraft-controller for heaters.
US1695308 *Mar 17, 1927Dec 18, 1928Wilt Frank EGas vent for gas stoves
US2420700 *Oct 18, 1944May 20, 1947William C CurphyExhaust pipe attachment
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2630748 *May 17, 1949Mar 10, 1953Brockelsby WayneExhaust rain protector
US2887032 *Mar 20, 1957May 19, 1959Jr Paul H WachterClosure attachment for exhaust pipes
US2930374 *Dec 23, 1958Mar 29, 1960Lord Richard JDown-draft deflector for gas fired furnaces and heaters
US3018714 *Sep 2, 1958Jan 30, 1962Edmund Brewer CliffordChimney cowls and ventilating devices
US3342023 *Jun 26, 1964Sep 19, 1967Kirk & Blum Mfg CoUpflow air outlet shroud
US3425178 *Oct 23, 1965Feb 4, 1969Wallace Murray CorpRain trap for prefabricated metal chimney
US3469518 *Oct 6, 1967Sep 30, 1969Howard Ben OOmnidirectional ventilator
US5321215 *May 11, 1993Jun 14, 1994Nelson Industries, Inc.Vertical exhaust system incorporating a water trap
US6802387Sep 27, 2002Oct 12, 2004Fleet Guard, Inc.Muffler with external water trap
US6868670Feb 28, 2003Mar 22, 2005Fleetguard, Inc.Compact, reduced backpressure, vertical exhaust water trap assembly
US7114330Mar 21, 2005Oct 3, 2006Fleetguard, Inc.Vertical exhaust water trap assembly
US7347044Jun 1, 2005Mar 25, 2008Fleetguard, Inc.Exhaust water trap
US7517380Jan 26, 2006Apr 14, 2009Fleetguard, Inc.Serviceable aligned exhaust aftertreatment assembly
US7582267Oct 5, 2005Sep 1, 2009Fleetguard, Inc.Space saving serviceable exhaust aftertreatment assembly
US7713493Dec 22, 2005May 11, 2010Fleetguard, Inc.Compact combination exhaust muffler and aftertreatment element and water trap assembly
US7779961 *Aug 24, 2010Matte FrancoisExhaust gas diffuser
US20060157296 *Nov 9, 2005Jul 20, 2006Belisle John IEngine exhaust system with water entrapment
US20070039316 *Dec 22, 2005Feb 22, 2007Bosanec John M JrCompact combination exhaust muffler and aftertreatment element and water trap assembly
US20070169452 *Jan 26, 2006Jul 26, 2007Grimm David MServiceable aligned exhaust aftertreatment assembly
US20080115989 *Nov 20, 2007May 22, 2008Matte FrancoisDiesel engine vehicle configurations for evacuation of engine and/or exhaust system heat
US20080116005 *Nov 20, 2007May 22, 2008Matte FrancoisExhaust gas diffuser
DE102013101646B3 *Feb 19, 2013Jul 31, 2014Berliner Luft. Technik GmbHRectangular deflector hood, has catching insert with unfolded legs whose angular deviation of specific degree is formed along flow direction with respect to housing wall of lower frustum pyramid
U.S. Classification454/41, 181/264
International ClassificationF24F13/02
Cooperative ClassificationF24F7/02
European ClassificationF24F7/02