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Патент USA US2370737

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March 6, 1945.
1.. A.’ KOCH
Filed July 1, 1942
Louis A. Koch
5y art/7W 5M7;
Patented Mar. 6, 1945
Louis A. Koch, Louisville, Ky.
Application July 1, 1942, Serial No. 449,332
4 Claims.
This invention relates to extensions or shrouds
for motor vehicle exhaust pipes and methods
of manufacturing the same, and more particu
larly to extensions of the type embodying a base
member of relatively cheap material and a
decorative overlay of more expensive material.
In the manufacture of prior types of extensions
such as that disclosed in my Patent No. 2,232,395
(Cl. 113-—116)
shapes they take in the ?nal product, the front
edges of the overlay and the base member secured
together by the tabs provided thereon, and the
overlay turned about the transverse axis of the
fastening tab or tabs to its ?nal position on the
base member and secured thereto at some point
spaced from the front edges of the two members.
The latter securing means is preferably ,of a
issued February 18, 1941, considerable expense
character such that it can be also utilized as a
has been involved because of the steps followed
in securing the overlay to the extension. A
stop or abutment for the end of the exhaust pipe
to predetermined the position of the extension
Referring to the drawing, H is a blank which
of manufacture to reduce the cost thereof and
is stamped to form the base member. Blank H
produce an improved product.
15 includes a section l2 forming the sleeve section
A further object of my invention is the pro
of the base member and a section l3 forming the
vision of a novel method of making an'extension
terminal or extending section. Ears 15 with holes
wherein the fastening means securing the overlay
14 are provided on sleeve section l2 so that when
to the base member is utilized to predetermine
the sleeve section is formed in a U-shape as
the position of the extension on the exhaust pipe. 20. shown in Figure 7, bolts may be passed through
In the drawing:
opposing openings IE to clamp the extension to
Figure l is a plan of the blanks employed in
the exhaust pipe. Terminal section I3 is stamped
forming the base member and the overlay.
with extending lugs l6 which are preferably re
Figure 2 is a side elevation of the blanks of
duced in section adjacent their point of con
Figure 1 after they have'been formed in sub
nection to the terminal section at I’! to facilitate
stantially the shapes desired in the ?nal ex
their being bent for a purpose later described.
Terminal section [3 terminates in a front edge
Figure 3 is a perspective of a jewel or orna
ment that may be employed in the extension.
Overlay blank l9 includes a front edge 2| hav
Figure 4 is a perspective of an insulating pad
ing tabs or lugs 22 thereon, an aperture 24, a
of material such as asbestos which is preferably
curved rear edge 25 and extending lugs 26 closely
employed to space and insulate the overlay and
adjacent thereto. Lugs 22 and 26 may be similar
jewel against the temperature of the base mem
in shape to lugs l6 if desired.
After blanks I l and I9 are stamped in the shape
Figure 5 is a side elevation of the various ele 35 illustrated, they are formed in the shape shown
ments making up the extension and illustrating
in Figure 2, sleeve section l2 being formed in
them in partially assembled position.
generally U-shape and terminal portion l3 and
overlay I9 being bent to correspond with one
Figure 6 is a side elevation of the extension in
a later stage of manufacture.
another in a general fan shape so that the over
Figure 7 is a section taken on the line 'l-'l 40 lay will cover the terminal section.
of Figure 6.
Prior to the assembly of the formed overlay
Figure 8 is a perspective of a fastening tab
and base member, the base member may be either
employed on the blanks to fasten the overlay to 4
enameled, painted, plated or otherwise decorated
the base member.
as desired as can the overlay. Preferably the
Figure 9 is a front elevation of the tab of 45 base member which is formed of relatively cheap
Figure 8.
material is enameled. As the overlay is prefer
Figure 10 is a plan of modi?ed blanks wherein
ably formed of a non-corrosive material and
the lugs employed to secure the front edges of
highly polished material such as stainless steel,
the base member and the overlay together are
it is preferably left as is.
In the ?rst assembly step shown in Figure 5,
placed on the base member blank instead of 50
the overlay blank as in Figure 1.
tabs 22 on overlay l9 are placed in contact with
the upper surface of edge I8 of terminal portion
In my invention, the base member and the
overlay are ?rst formed as flat blanks, fasten
13 and spot-welded or equivalently fastened
ing lugs being provided on either or both. The
thereto. To insure the necessary contact with
blanks are then formed to substantially the
base member I l which may have been enameled.
major object of my invention is to simplify the
construction of such extensions and their method
it is preferred to punch small depressions in lugs
22 as shown in Figures 8 and 9 which form points
32 extending from the bottom surfaces. Thus
when lugs 22 are pressed against the enameled
surface of base member I I, they penetrate the
enamel and make contact with the base metal.
After lugs 22 have been spot-welded or other
wise fastened to member ll, jewel 21 is inserted
in opening~24 ‘.andasbestos pad-3| ,placed'there ‘
beneath. As‘ jewel 21 includes a section 28 of
smaller size than aperture 24 and a section 29...
of large size, overlay 19 will engage section 29‘ ~'
for a ‘motor vehicle exhaust pipe, said extension
being of the type including a base member and
an overlay member of a size to cover a portion of
the base member, comprising the steps of; blank
ing the base member and the overlay member, the
front end of one of said members being formed
with at least one projecting tab; shaping the
blanks to substantially the forms required in
they ?nal extension‘; placing the base member and
to hold the jewel securely imposition atop-parks
the‘ overlay member in inverted relation relative
to one another with the tab on the front edge of
the one member in contact with the front edge
of 1 the =.other.- member; permanently connecting
the front ends of both members together by se
Overlay I9 is then turned aboutwthe trans-.5
verse axes of tabs 22 to the position shown in 15 curing the tab to the other member; folding the
be in engagement with the upperlsurfacewofi-the 5
tababout a transverse fold line while turning the
overlay member- about such fold line to its ?nal
base member and the lower surface of the jewel
permanent position on the'base member; and
Figure 6. In this position, asbestos pad»3|-~‘will~‘~
and overlay.
It thus operates to space the =over- I‘
lay_from.the base member, provides a thermal»
insulator, therebetween, and maintains the jewel ..
securing the overlay member to the base mem
berxatha point spaced from the front edges of
saidmembersjto retain theoverlay in its ?nal .
in‘ position.,As .will .be notedin Figure 6, when .
the'overlay is turned toits .?nal position,.tabs;26 a
permanent position on the base member.
ofthe overlay and tabs. l6 of thebasememben
member and, the “overlay member are blanked
come into registrations Thesetabs are prefer-v ~
ablyispot-welded or. similarly, fastened together. .
and bent inwardly as shown in._Figure 7 whereby’ .7
they operateaslstopsor. abutments for the end
of the exhaust pipe when .the extension is mount- .
edthereon, thus .predetermining the positionof '
the extension.
It will be..understood thatin the event either
the basemember or the overlay member is coated .
with insulating material orpainted, tabs l6 and .
26jwill beformedas shown/in Figures 8 and 9 to Y
insure the necessary contact forspot-welding,v
Figure 10, illustrates anoverlay blank and a a.
base member blank-of the same general shape as.
2. ‘The process ofgclaim,1 wherein the base .
withside tabs on their side edges adapted to reg
ister when the overlay is turned to its ?nal posi
tion,,.and the side tabs are-secured-together.
3. ‘The process of claim> 1 wherein. the base 7
member and the overlay areblanked with side .
tabs ontheir side edges adapted to register when >
the‘ overlay is turned to its ?nal position, and
the?side tabs ,are. secured together and bent in
wardlyitozforme stop arranged to abut the end
of a motor vehicle exhaustpipe when installed
thereonto predetermine the position of the ex
4. In'ja process of manufacturing an extension
for'a motor vehicle exhaust pipe, said extension -
being- .of .the type including a base member. and .
shown. in Figure 1 except that the end tabsare .
omitted-from the overlay blankl?fs In lieu of“v40 an overlay member of a size to cover a portion
of .thebasemember, comprising the steps of;
tabs_22,.tabs or lugs 33 .are stampedintegrally»
with. base memberblank I I’. In the assembly of .
theseblanks, after they are formed, they “are .
joined .-in a manner similartothat shown in,Fig-.
blanking ,the base member andthe overlay mem
her, the frontendof the latter being formed with
ure..5 except that tabs,33.are. placed in contact '
substantially “the form-required in the ?nal ex
andsecured to the surface.v of ‘the. overlaynblank
that becomes the lower surface in the ?nal as-~_:
tension; placing the base member and the over
lay.._member ;in- inverted relation relative to one
another :with the tab-zin. contact withione edge,
sembled-extension. , .
In forming overlay blanks. l9 and. I9’, section curved generally as .shown in Figures? and. '
7 so that the rear end .of the overlaywhich is‘
spaced from the base member forms an air. scoop q
34 ,whichoperatesto collect- air and conduct. it
intojthe .space between the overlay and the: base":v
member to e?ect cooling ‘thereof andfurther-pre- vent any damage. or .cliscolorationv ofqthe; overlay‘, w
byreason of the hightemperature ‘of the exhaust v;
‘Having ‘described-my_-invention, I claim:;.
1. In. a process ,of-vmanufacturing. an extension: 60
at least one projecting tab; shaping the blanks to ~
of the. base member; permanently connecting the
front-ends of 'both' members-together by secur
ing the .tab “to: the‘ - vbase 1 member; ~ bending the
tab‘about‘a transverse line while rotating the '
overlay member about such transverse line to its
?nal permanent position on ‘the base member;
and ‘securing a portion of the overlay. spaced from
the _.tab_t.0 the .base member. to retainthe overlay
in its ?nal permanent position on thebase mem-‘
ber:_ .
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