US2468961A - Exhaust pipe attachment - Google Patents

Description

May 3, 1949. w. c. CURPHY EXHAUST PIPE ATTACHMENT Filed March 5, 1945 lll INvENToFe WILLIAM C.CURPH Patented May 3, 1949 UNITED STATES PATENT OFFICE EXHAUST PIPE ATTACHMENT William C. Cui-phy, Monteur, Iowa Application March 3, 1945, Serial No. 580,899

This invention relates generally to tractors and like vehicles and in particular to an attachment for an upright exhaust pipe for the engines on such vehicles adapted to keep moisture from entering the exhaust pipe when the vehicle is standing idle in the open.

Tractors now in general use for road construction and farm work usually have their engines provided with upright exhaust pipes which protrude upwardly through the engine hood a distance such that the exhaust gases are carried away from the tractor operator. When these tractors are left in the open with the top of the exhaust pipe left uncovered, rain, snow and the like enters the exhaust pipe and travels therethrough into the engine cylinders. As a result the cylinders, and valves operatively associated therewith, are apt to become rusted so as to reduce their service life. More important, however, is the fact that when considerable moisture becomes entrapped in the cylinders, and the engine is then started, serious injury generally results to the crank shaft or piston connecting rods. This occurs because of the relative noncompressibility of the moisture and the resultant failure of the piston to move to its normal upstroke position. Because of this condition the connecting rod and engine shaft are either bent or broken.

In order to prevent moisture from entering into the engine cylinder it is the usual practice to cover the upper end of the exhaust pipe with canvas or an inverted tin can. However, this procedure is often neglected or forgotten by the tractor operator. As a result exhaust pipe cover attachments have been provided which are operatively associated with the engine throttle or ignition system to automatically open the exhaust pipe when the throttle is open or the ignition system closed, and to automatically close the exhaust pipe when the engine is stopped. These devices, however, are generally complicated and are a source of inconvenience in usual engine service work because of the time required for their removal from and assembly with the exhaust pipe. Further it is apparent that the exhaust pipe can be opened on any accidental opening of the throttle or closing of the ignition system as frequently occurs in the case of children playing on tractors standing idie on farms.

It is an object of this invention, therefore, to provide an improved exhaust pipe cover attachment.

A further object of this invention is to pro- 2 Claims. (C1. 98-60) Ail) vide an attachment for theupright exhaust pipe of an engine which is constructed without any movable parts and adapted to keep moisture from entering the exhaust pipe when the engine is at a standstill. y

Yet another object of this invention is to provide an attachment for keeping moisture from entering an upright exhaust pipe for an engine which is of a simple and inexpensive construction, positive and efficient Ain operation, capable of being quickly and easily installed and removed for engine-servicing purposes and which does not interfere in any way with the operation of the engine.

A feature of this invention is found in the provision of a cover attachment for an upright exhaust pipe, comprising av tubular body member with a reduced exhaustinlet at one end positionable above the exhaust pipe and an exhaust outlet at its opposite end incoaxial alignment with the exhaust inlet. The'inlet is connected with the body member by a perforated ring member. Within the body member is a moisture deilecting member extended across the proiected areas of the exhaust inlet and outlet and having a downwardly sloped upper surface to contact moisture entering the body member through the exhaust outlet and to direct such moisture' to a position on the defiecting member for dropping onto the connecting ring. `The moisture on the Connecting ring is drained 4 through the perforations therein to the outside of the exhaust pipe.

Further objects. features and advantages of this invention will become vapparent from the following descrintionwhen taken in connection with the accompanying drawings in which:

Fig. 1 is a fragmentary side view of the front portion of a tractor showing one form of the attachment of this invention in assembly relation with an upright exhaust pipe for the tractor engine; V

Fig. 2 is a longitudinal sectional view through the attachment shown in Fig. 1;

Fig. 3 is a sectional view taken along the line 3--3 in Fig. 2;

Fig. 4 is a sectionalnview on the line 4-4 in Fig. 2; I

Fig. 5 is a side elevational view of a modified form of the invention. i

Referring to the drawings there is illustrated in Fig. 1 the front portion of a tractor having an engine it, an exhaust gas manifold l l, and an upright exhaust pipe i2 projected through the top of the engine` hood '13. --The exhaust pipe attachment of this invention is indicated generally at I5 in assembly relation with the upper end IB of the exhaust pipe I2.

One form of the exhaust pipe attachment of this invention shown in Figs. 2, 3 and 4, cornprises a lower straight tube member I'I having a slotted bottom end adapted to be positioned about the upper end I6 of the exhaust pipe I2. The tube I1 is secured to the exhaust pipe by a usual clamping strap I8.

An upper bent .tubei or casing` I9,'` of va circular shape in cross section', has a central portion formed with a substantially 180 bend, with such bend terminating in straight end portions 2I and' 22 arranged in coaxial alignment longitudinally of the tube I9. The top end 24 of the lower straight tube I'I is positioned in a concentricallyy spaced relation within the lower end 2| of thebent tube I 9 (Figs. 1 and 2). This spaced relation is maintained by a perforated ring member- 23 which is connected between the lower end of the bent tube;v I9-and4 the.4 top end 24y ofthe straight tube Il.`y It is seen, therefor-e, that the ends` 2Il-y and 2'I of theftubesgITand I9, respectively, are inan overlapped relation and with vthe end 2l in a spaced relation aboutlthe end 24.

The openings"inthe-fendsI 2'If and-220iv the bent tube-Igffare` ofialikev size and by' virtuev of, such ends beingincoaxialfalignmentthe` upper end 22fis .directlyabovefthe lowerend?! so thatv their projected cross,-sectional areas. as indicated b v the dot-dashvlinesfAin Figl 2. denea straight. cylinder; Thebend in .thefcentral portion of theA bent tube I 9 is--such that theinner wall Zeithereof. extends substantially across the projectedareas ofthe1 ends 2 Iyandg22f Since thetop end 2410i the-straightiubell isarranged in a-spaced relation Jwithin the bottom end- 2 I ,ofthe tube I9, the Y projected cross sectionalgareasofthe tube I'I. in-,. dicated bythe dot-dash-,linesBwin Fig. 2, liest within-the-projectedareas of the-endsfZI `and 22` ofthe bent tube I9 and' isecompletely intercepted by theinnerwall- 26r- InY-th-e operation-.of -the,attachn'ient shownv inVY Fig. 2zmoisture.:,enteringethe top .end,22.of the. bent tube -I S'mayceithericontact the Vouterwall 2l of thebent ,central section, drop` directly. through the open end 22fontoftheconneoting ring.23. or fall against theuppei-,downwardly .sloped portion 28 of the inner-wall .26,z depending upon ,the direction .in -which the-,moisture enters .the open end 22,as .indicated .bythe-arrows in Fig. 2. The,Y a

moisturecontacting .,thewouter wall 21 is moved by. gravityalong `the innersurface of this wallto theconnectingmingr3.. The moisture falling on i. the-upper slopedportion .Z8-of theinner wall 26,. is moved bycgravityto .the innermost `surfacell) 1 of the inner4 wall.,26,`. which surface. is in a substantially ,verticalplane extendedthrough apart ofthe'connectingring 2.3,as ,clearlyfappears fromr a consideration of Figs. 2 and.

A part of the moisture directed to the surface. i

ZBma-y dropy therefrom onto that part of the connecting ring 23'whichis vertically belowthe, surface-29. whiletheremainingpart of the moisture may follow the surface 29 and the lower slopedvv surface ,3| of the innerwall to the connecting ring. All ofthe water'falling or draining to the connectingY ring is. drained through the perforations therein tothe outside vof fthef lower straight tube I'I, and in turn to the outside of the exhaustpipe I2.- upper'slopedsurfacez-constitutes a moisture deiiecting member extended across the projected cross-sectional `area of the exhaust pipe I2.for directing water to the outside of the exhaust pipe opening;v

Itis-seein therefore, that the F The attachment in no Way interferes with the operation of the engine I0, the lower straight tube I'I serving as an exhaust gas inlet for the bent tube I9, and the open end 22 constituting an exhaust gas outlet. Since the bent pipe I 9 has a relatively smooth curvature and is of a greater diameter than the diameter of the exhaust pipe I2 a free passage of exhaust gases takes place through the attachment without the buildfup of any objectionable exhaustback pressures.

The modiiied form of the invention shown in Fig. 5 is similar in all respects to that shown in Fig. 2 except that the bent pipe or casing I9a is formed of a plurality of independent pipe sectionsl 32; 33'and 34 Welded together in an end-toend relation toaccomplish a substantially 180 curvature in the pipe I9a while having the opposite-end openings thereof in coaxial alignment. The assembly and operation of the attachment in-Fig. 5 is similar in 4all `respectstothe assembly and operation of the attachmentiin Fig; 2,' so that stock materiaL and which is entirely free of any` movable parts whereby a positive and eilicient operation is assuredfat all times. Further, in servicing the engine I0.' it is usually necessary to remove the hood I3. This isvdone by lifting the hood I 3upwardly over the upper end I6 of the exhaust pipe I2 as indicated atD in Fig. 1 for a lifted position of the hood. Since'the attachment of this invention is secured to the exhaust pipe I2 only by the clamping member I8, it is readily removed from and assembledy with the exhaust pipe as a unit so that thev attachment offers but little-inconvenience in engine Work.

Although the invention has' been described with respect to several embodiments thereof it is to be-understood that it is notto be so limited since changes and modifications can be made therein which arey within the full intended scope of this invention as defined by the appended claims.

I claim:

1. The combination with an upright exhaust pipe for an engine, of an attachment to keep moisture from entering the upper end of said exhaust pipe when the engine is not being operated, comprising a first upright tube member having its lower end adapted to be secured to said exhaust pipe upper end, a second upright tube member of larger diameter than said first tube having its bottom end in an overlapping relation with the top end of said first tube, means for connecting said 'bottom end and said top end in a concentrically spaced relation having drain openings therein, with said second tube being formed with an arcuate bend therein such that its opposite endopenings areA in co-axial alignment and a wall portion at said bendy is extended across the projected area of said rst tube, whereby moisture entering said second tube through the upper end thereof `falls on the inner surface of said wall portion for gravity flow thereon to a position above a portion of said connecting` means, said second tube member being of substantially the same cross sectional areaA overitsf complete *length so as to provide for an unrestricted flow of exhaust gases therethrough.

2. An attachment for an upright exhaust pipe of an engine adapted to keep moisture from entering the upper end of the exhaust pipe, cornprising a tube member having opposite end openings in coaxial alignment, and a central portion of a substantially semi-circular shape, with the inner Wall of said central portion being extended across the projected areas of said coaxially aligned end openings, said tube member being of substantially the same cross sectional area over its entire length to provide for an unrestricted flow of exhaust gases therethrough, an exhaust inlet for said tube member adapted to be positioned about said exhaust pipe upper end, and means supporting said exhaust inlet in a spaced relation with said exhaust pipe upper end, with said supporting means having drain openings therein.

WILLIAM C. CURPHY.

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

UNITED STATES PATENTS Number Name Date 1,626,002 Lobit Apr. 26, 1927 1,811,323 LeJay June 23, 1931 10 2,164,987 Cover July 4, 1939 2,350,102 Fairbanks May 30, 1944 2,420,700 Curphy May 20, 1947 FOREIGN PATENTS 15 Number Country Date 3,421 Great Britain 1914 5,358 Great Britain 1826 8,091 Great Britain 1910 12,857 Great Britain 1887 20 16,393 Great Britain 1900 22,362 Great Britain 1912 290,955 Great Britain May 24, 1928 338,779 Great Britain Nov. 27, 1930

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