US1479714A - Exhaust muffler for motor cars - Google Patents

Description

Jan. 1

F. J. HERDLE EXHAUST MUFFLER FOR MOTOR CARS Filed Nov. 21, 1921 INVENTOH fjfierd/a ATTORNEYS Patented Jan. 1, 1924.

UNITED STATES FREDERICK J. HERDLE, OF CHICAGO, ILLINOIS.

EXHAUST MUFFLER FOR MOTOR CARS.

Application filed November 21, 1921. Serial No. 516,693.

To all whom it may concern):

Be it known that I, Fnnomrox J. Human, a citizen of the United States, and a resident of Chicago, in the county of Cook and State of Illino1s, have invented a new and useful Improvement in Exhaust Mufilers for Motor Cars, of which the following is a full, clear, and exact description. I

My-invention relates to improvements in exhaust mufllers for motor cars, and it consists in the combinations, constructions, and arrangements herein described and claimed.

An object of my invention is to provide a mufiler which has means for reducing the back pressure upon exhaust gases passing therethrough.

A further object of my invention isto provide a device of the t pe described which has means therein for e ectually baflling the exhaust gases.

A further object of my invention is to provide a device of the character described which has automatic means for instantly expelling the exhaust gases when the pressure therein has exceededa predetermined pressure.

Ar further object of my invention is to provide a device of the character described which is simple in construction, easy to assemble, and which is not likely to easily get out of order.

Other objects and advantages will appear in the following specification, and the novel features of the invention will be particularly pointed out in the a pended claims.

My invention is i lustrated in the accom panying drawings, forming part of this application, in which- Figure 1 is a longitudinal section-through the device,

Fi re 2 is a section along the line 22 of Figure 1,

Figure 3 is a section along the line 33 of Figure 1, and

Figure 4-. is a section along the line 4-4 of Flgure 1.

In carrying out 111 invention, I provide an outer cylinder 1 w ich is slightly conical in shape. An end plate 2 is provided wlth an annular flange 3 over which the smaller end of the cylinder 1 is disposed. The end 2 is also rov'ided with an annular flange 4 which is isposed inside of the flange 3 and is concentric therewith. A conical-shaped cylinder 5 is disposed in the cyllnder 1 and around the flange 4. This cylinder has its larger opening disposed adjacent the end 2. It will thus be seen that I provide a space between the cylinder 1 and the cylinder 2 which is tapered from the end 2. The two cylinders 1 and 5 are substantially of the same length. A ring 6 is disposed at the opposite end of the cylinder 1 and has an annular flange 7 which is disposed in the cylinder 1. As clearly shown in Figure 2, the ring 6 is also rovided with three inwardly projecting ugs 8. These lugs are provided with curved recesses at the inner ends thereof. The cylinder 5 is provided with an end plate 9 which has an annular flange 10 that projects into the open end of the cylinder. he end 9 has three outwardly extending lugs 11 which are adapted to be alined with the lugs 8 of the ring 6 and to overlie the same. The lugs 11 have openings therein in which bolts 12 are disposed. These bolts are substantially as lon as the c linders 1 and 2 and are dispose in the a ined openings of the ring 6 and the end plate 2, whereby these two members are rigidly secured to the cylinders 1 and 2. I show three of these bolts, although any number so desired may be used. A curved pipe 13 is secured to the ring 6 by means of bolts 14. The end 2 has a spherical-shaped. dome 15 integral therewith, the dome being provided with a threaded opening 16 therem. The end plate 2 can therefore be secured to an exhaust pipe 17 by merely screwing the end plate 2 onto the pipe 17 The cylinder 1 has a plurality of openings 18 therein which are disposed adjacent to the plate 2. A funnelshaped member 19, secured to the cylinder 1 by means of rivets 20, is so disposed on the cylinder 1 that the openings 18 are adjacent to the inner side thereof. A bafile plate 21 of the shape shown in Figure 1, is secured to the flange 4 by means of screws 22. It will be observed that the bafile plate has openings 23 through which the exhaust gases from the pipe 17 are permitted to pass. The cylinder 1 has a plurality of openings 24 therein which are disposed adjacent the ring 6. As shown in Figure 1, the wall of the cylinder 5 is bent outwardly adjacent each of the openings so as to permit the exhaust gases in the cylinder toreadily pass through the openings 24. The plate 9 has a central opening 25 therein which is substantially the same size as the opening 16. A weighted door 26 is hingedly secured to the plate 9 and is adapted to'covcr the opening 25 and to swing away therefrom when the pressure of the exhaust gases in the cylinder 5 exceeds a predetermined pressure. An asbestos pad is carried by the door and tends to deaden the sound when the door swings back to normally closed position. The door 26 is also provided with a threaded rod 27 on which a Weighted nut 28 is disposed. It will be seen that a rotation of the nut 28 in either direction will cause a greater or less pressure of the exhaust gases, as the case may be, in the cylinder to open the door 26. A baffle screen 29 is disposed in the cylinder 1 and extends substantially the entire length thereof. As shown in Figure 3, the screen 29 is corrugated and is rolled up before being inserted into the cylinder 1. One end of the screen 29 is made of a fine mesh and the opposite end thereof is made of a coarse mesh. When rolling the screen, the coarse mesh is disposed in the middle of the roll. This construction permits the exhaust gases to readily pass through the first few rings of the screen, since the rings are composed of coarse mesh, but hinders the gases from rapidly passing on through the outer rings of the screen, since these rings are composed of a finer mesh.

From the foregoing description of the va rious parts of the device, the operation thereof may be readily understood. It will clearly be seen that as the gases from the pipe 17 pass into the cylinder 5, they will be diverted from their course by the baffle plate 21. The gases then pass on through the screen 29 and out through the openings 24 into the cylinder 1. As heretofore stated, the gases are effectually baflled, since the mesh of the screen29 varies from coarse to fine. It will also be observed that the member 19 directs a column of air through the openings 18 and into the space between the cylinders 1 and 5. This air passes on through the spaces between the lugs 11 and out of the pipe 13.

The rush of the air between the cylinders 1 and 5 reduces the back pressure that is prevalent in mufliers of ordinary construction. It is obvious that the exhaust gases which are expelled from the cylinder 5 into the space between the cylinders 1 and 5 are carried out through the opening of the pipe 13. It will also be observed that the opening 30 of the pipe 1.3 is larger than the opening 16 of the plate 2 and therefore permits the exwould put the muflier out of commission, whereas in my device the exploded gases would force the door 26 open and would pass through the opening 25 and out through the opening 30. As heretofore stated, the Weight of the door 26 can be varied by means of the nut 28 so that the door will normally keep the opening 25 closed when the ordinary amount of the exhaust gases are passing through the muffler.

The muffler can be readily disassembled by merely unloosening the bolts 14 and removing the pipe 13 and then unloosening the nuts on the bolts 12 and removing the cylinders 1 and 5 from the plate 2. As will be seen in Figure 2, the bolts 12 are received in the recesses of the lugs 8 and thereby prevent the ring 6 and the pipe 13 from rotating with respect to the cylinders 1 and 5. As heretofore stated, the device consists of a minimum of parts, is effective forthe-pu'rpose intended, and will not easily get out of order.

I claim:

1. A mufiler comprising an outer conicalshaped cylinder and an inner conical-shaped cylinder, the larger end of said inner cylinder being disposed adjacent to the smaller end of said outer cylinder, said outer cylinder having openings adjacent to the smaller end thereof, a funnel-shaped member carried by said outer cylinder and disposed adjacent to the openings, said inner cylinder having openings adjacent to the smaller end thereof and having an exhaust inlet adjacent to the larger end thereof, a rolled screen disposed in said inner cylinder, and a gravity door carried by said inner cylinder and communicating with said outer cylinder.

(l 2. A mulfier comprising an inner conicalshaped cylinder, an outer conical-shaped cylinder, a plate secured to the adjacent ends of both cylinders, said plate having an exhaust inlet communicating with said inner cylinder, a baflle plate disposed in said inner cylinder and secured to said plate, a rolled screen disposed in said inner cylinder, and a gravity door carried by said inner cylinder and communicating with said outer cylinder.

3. A mufller comprising an inner conicalshaped cylinder, an outer conical-shaped cylinder, a late secured to the adjacent ends of both cylinders, said plate having an exhaust inlet communicating with said inner cylinder, a bafile plate disposed in said inner cylinder and secured to said plate, and a rolled screen disposed in said inner cylinder, said screen being corrugated and having a coarse mesh in the inner circles thereof, which gradually -decreases to a fine mesh in the outer circles thereof.

4. A mufiler comprising an inner casing, an outer casing, said inner casing having openings in the side wall thereof, a gravity actuated door adapted to close one end of coarse mesh in the inner circles thereof which gradually decreases to a fine mesh in the outer circles thereof and a gravity actu- 1 ated door adapted to normally close one end of said casing.

FREDERICK J. HERDLE.

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