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Nov. 5, 1946.
2,410,452
w. s. LOEB
PISTON RING
3 Sheets-Sheet l
Filed Dec. 16, 1944
'
mmvroxz
'azzz 5. L08
Nov. 5, 146.
W. S. LOEB
2,410,452
PISTON RING
Filed Dec. 16, 1944
?sheets-sheet 2
Nov. 5,
"I'M-36.
' w, s, LQE'B
I
v ZAIOASZ
Filed Dec. 16, 1944
:5 Sheets-Sheet s
PISTON RING
2,410,452
rrsroN nmo
William- S. Loch, Philadelphia, Pa, assignor to
We
Manufacturing Company, lPhiladeh
phia, Pa.
Application December 1c, islcliseriai me. scenes
22 Claims.
The present invention relates to piston rings‘
and it relates more particularly to piston-rings
adapted for use in internal combustion-engines.
An object of the present invention is to pro
vide a simple, inexpensive and e?cient piston
, ring for internal combustion-engines.
Another object of the present invention is to
provide a composite oil-control piston-ring made
up of a plurality of interchangeable circumfer
entially-disposed and interlocked segments ar
ranged in self-interlocking and form-retaining
relationship.
(er see-s5) .
“Figure i represents a perspective view of a
segment‘ identical with that of Figure 3, but
shown ‘as it appears when rotated vertically
through 180° preparatory to assembly. with the
segment of Figure 3.,
Figure 5 represents a vertical cross-sectional
view, on an. enlargedscale, generally along the
line t-t of Figural,
~
.Flgure 6 represents a vertical cross-sectional
view generally along the line t~5 of Figure 5.
Figure 7 represents. a fragmentary perspece
tive view generally similar to that of Figure 2
but showing another. embodiment of the present
invention; parts being ‘broken away better to
of a plurality of interchangeable segments formed 15 reveal the construction thereof.
Figure 8 represents a‘perspective view of one
of sheet metal or the like, suitably bent and
of the segments vmaking up the embodiment of
folded to provide a base and a pair of converging
Figure ‘l.
_
>
sides having free ends spaced somewhat apart;
Figure 9 represents a perspective view of an
the segments being interlocked with one another
other segment complementary to that of Figure 8
(successive segments pointing in opposite direc
tions) and being adapted to fit within the groove
and used therewith in} making up the embodi
of a piston so as to provide generally triangular,
ment of Figure 7, shown in inverted position rela
In my Patent 2,343,915, I have disclosed a
self-expanding oil-control ‘piston-ring composed
radially-extending oil-passageways axially-intep
tive to the segment ofFigure 8.
Figure ll) represents a vertical cross-sectional
mediate upper and lower, more or less continuous,
cylinder-contacting ribs or lands.
25 view generally similar to that of Figure 5 but
, The present invention contemplates a further
improved piston-ring construction of the general
showing the embodiment of Figure 7.
Figure 11 represents a fragmentary perspective
view generally similar to that of Figure 2 but
character disclosed in my aforesaid ‘Patent
2,343,915; the improved piston-ring of the pres-v
showing still another embodiment of. the pres
ent invention being characterized by simplicity of~ 30 ent invention.
.
a
Figure 12 represents a perspective view gen
manufacture and assembly and positive vsupport
erally similar to that of Figure 3 but showing
against undesirable relative movement of the
' segments of the ‘assembled piston-ring during
one of the segments making up the embodiment
use.
I
,
of Figure 11.
_
For the purpose of illustrating the invention, 35 Figure 13 represents a fragmentary perspective
there are shown in the accompanying drawings
view, on an enlarged scale, of a further embodi
forms thereof which are at present preferred,
ment of the present invention.
Figure 14 represents a perspective view of one I
although it is to be understood that the various
of the segments making up the embodiment of
instrumentalities of which the invention consists
can be variously arranged and organized and 40 Figure 13 shown in inverted position.
that the invention is not limited to the precise
Figure 15 represents avertical cross-sectional
arrangements and organizations of the instru
view generally similar to that of Figure 6 but
mentalities as herein shown and described.
showing the embodiment of Figure 13.
Referring to the accompanying drawings in
In one embodiment of the present invention,
which like reference characters indicate like
shown in Figures 1 to 6 inclusive, I may provide
parts throughout:
‘
a piston ring formed of a plurality 01’ identical
Figure i represents a perspective view of one
interchangeable segments indicated generally by
embodiment of the present invention, shown in
the reference character is.
compressed installed position.
‘
'
The segments it are constructed of sheet metal
Figure 2 represents a fragmentary perspective 50 or the like formed by suitable stamping, bend
view, on a greatly enlarged scale, of the em
ing, folding, grinding and/or other manufactur
ing operations in any desired sequence,
bodiment of Figure l.
_
Each segment includes a base 25, a pair of
Figure 3 represents a perspective view, on an
converging sides 22 and a pair of flanges 23
enlarged scale, of one of the segments making up
55 formed at the ends of the sides 22 and extending
the embodiment of Figure l.
2,410,452
3
4
generally parallel to the base 2|, The base 2|,
in’ Figure 6,. the‘ convex edges 28 of the segments
formed of sheet metal or they like as hereinabove
contact the cylinder wall 35.
The notches 3| are made slightly oversize rela
described.
tiveto the buttons 30 so that a small amount of
‘ , sides 22 and ?anges 23 are preferably integrally
'
A gap 24 is provided intermediate the free ends
of the sides 22 to permit assembly of a plurality
of segments 20 in interlocked position as will be‘
radial movement of the segments is permitted.
Thus, the individual segments may adjust them
selves to irregularities in the cylinder wall 35
jhereinbelow described.
The distance intermediate the free outer edges
such as may be caused by wear.
When- the segments 20 are fully assembled, a
of the ?anges 23 is generally the same as the
.10 generally continuous ring is formed. That is,
transverse dimension of the base 2|. That is, the
total ‘transverse dimension of the two ?anges 23
and the intervening gap .24 is generally'the same
" there is no “free-end” or “gap” as is the case with
conventional one-piece piston rings.
The fully-assembled piston ring is so dimen- '
as the transverse dimension of the base 2|.
sioned as to be compressed slightly when assem
As shown particularly in the isometric perspec 15 bled on a piston within a cylinder. Due to the
tive views of Figures 3 and 4, the fold-lines 25
resilience of the sheet metal segments 20, the as
, forming the junctures of the sides 22 with the
sembled piston ring has an inherent resilient
base 2|, the free edges 21 of the ?anges 23 are
tension which tends to expand it radially and
‘ formed along lines of radius of the cylinder in
circumferentiallyso that there is no need for a
which the ring is adapted to be used so that the 20 separate expander spring as is usually required
sides of the segments have a radially-inward ta
with conventional one-piece oil-control piston,
rings.
per.
vHowever, the fold-lines 26 forming the junc
Aslcan be seen particularly in Figure 5, the
tures of the sides 22‘ with the ?anges 23 are op
abutting sides 22 and ?anges 23 of adjoining
~_similarly-disposed segments 20 form radially-ex
positely tapered; that is, the fold-lines 26 of each segment diverge radially inwardly. Thus, when
tending oil passageways 36 which are generally
the segments are assembled in the manner shown
triangular in cross-section; circumferentially suc
in Figure 2, the fold-lines 26 of successive upper
cessive passageways 36 having their apices dis
segments v?t snugly against the fold-lines 25 of
posed alternately adjacent the top and the bot
7
the intermediate lower segment and vice versa. 30 tom of the piston ring. The outer edges 28 of the segments 20 are
As previously described, the buttons 30 and the
given a slight transversely convex curvature cor
notches 3| provide radial interlock for the seg
responding to the curvature of the cylinder in
ments20. The converging sides 22 form a‘ cir
which the piston ring is to be used, so that, when
cumferential interlock for the segments. Thus,
a plurality of the segments are assembled in the 35 the segments are positively locked in position and
manner shown in Figure 1, they form a com
the ?nally assembled piston ring will retain its
plete circleof predetermined diameter. The in
shape during use and cannot come apart; it be
ner edges 23 of the segments 20 may be given a
ing necessary to deliberately spread one of the
segments apart (by exerting circumferentially dis
corresponding transversely concave curvature as
shown particularly in Figures 1 and 2.
A central inwardly-protruding locking button
40 tending forces thereon greater than would nor
mally be encountered during operation) in order
to disassemble the ring when desired.
During axial movement of the piston 33 with
in the cylinder, oil is wiped from the cylinder
wall 35 by the cylinder-contacting edges of the
segments 20 and is sent through the passageways
36, the groove 32 and the oil draining openings
3|) is integrally formed in the base 2| of each
segment 20. Generally semi-circular notches 3|
are formed in the ?anges 23 adjacent the free
edges 21 thereof.
-
.
'The composite piston ring of Figures 1 to 6 is
assembled by interlocking the segments 20 as
shown generally in Figure 2. That is, successive
segments 20 are arranged with their bases 2|
3 34, and is returned to the crank-case (not shown) ,
thus providing continuous lubrication for the
alternately on top and on bottom. One side 2| 50
of each of a pair of adjoining downwardly-open
ing segments is then positioned within the gen
erally triangular opening de?ned by the free sides
and base of an upwardly-opening segmentf the
cylinder wall 35.
.
.
The present construction permits various sizes
of piston rings to be assembled from standard '
'ring segments by simply employing lesser or
greater numbers of segments depending upon the '
free edges of the enclosed ?anges fitting in abut- ,
diameter'of the cylinder. That is, the construc~
tion of the present invention eliminates the
3| thereof forming a more or less complete cir
necessity for maintaining stocks ‘of many dif
cle ?tting about 'the button 30 so as to maintain
ferent-size piston rings to ?t the cylinders of
the several segments in radially-interlocked po
various make internal combustion engines; seg
60 ments of a given size and given degree of curva
It is apparent that, when the above-described
ture being capable of assembly into piston rings
step is repeated, a complete piston ring will even . of relatively widely‘ different diameters.
tually be formed; the adjoining ?anges of each
In Figures 7 to 10, I have shown another em
pair of similarly-opening segments being enclosed
bodiment of the present invention. In this em
ting relationship with the semi-circular notches
1
sition.
>
within the ?anges of the intermediate oppositely
,
opening segment.
‘
Due to the natural resilience of the segments
20, the free sides 22 thereof can be spread apart
somewhat momentarily tojincrease- the trans
verse dimension of the gap 24 so as to facilitate
‘the assembly of the segments into a complete
- bodiment, segments 3‘|—a and 3'l-—b are em
ployed to make up the oil-control piston-ring.
The segments 31-11 and 31—-b are generally the
same in 'form as the segments 20 described in
connection with the embodiment of Figures 1 to
6._ Thus, each of the segments 31-11 and ‘31-h
is composed of a base 38, converging sides 39 hav
piston ring,
ing a gap 40 therebetween, and ?anges 4|. The
radially-outer edge of each of the segments
When the segments are assembled as described
31-0 and 31-—b may also be transversely con
above within the groove 32 o! a piston 33 ‘having
- one or more oil-draining openings‘ 34 as shown 75 vexly curved-as described hereinabove in ‘con
2,410,452
s‘
‘
3
»
nection with the embodiment of Figures 1 to 6.
However, in the embodiment of Figures 7 to 10,
button 56 formed thereon, converging sides 51
the button is omitted from the base of each seg
ment and the semi-circular notches are omitted.’
having semi-circular notches 80 formed at the '
free edges thereof.
'
. from the free edges of the ?anges.
_
Instead, the converging sides 39 of the upper
segments 31-01. are provided with outwardly
protruding buttons 42; corresponding indenta
tions 43 being formed on the inner edges of said
sides.
~
having a gap 58 therebetween, and ?anges 59
~
The sides 51 and ?anges 59 are cut vback from
the radially outer convex edges 6| of ‘the base 55.
Thus, as shown particularly in Figure 15,‘ the
assembled piston-ring contacts the cylinder wall
35 only along upper and lower spaced ribs formed
by juxtaposed upper'and lower edges 6|, thereby
The converging sides of the lower segments
3'i—b ‘are provided with inwardly-protruding but
increasing unit pressure of the ring.
?anges M of successive'segments.
withoutthe necessity for coining operations.
-
Furthermore, since the side edges 52 of the
tons 4d.
.
.
‘
radially outermost portion of each base 55 can
As can be seen particularly in Figures 7 to 10,
be formed as a plane surface (as distinguished
when the segments 3l—a and 3'i—'b are as 15 from the rounded surfaces at the zones of junc
sembled, the buttons M'of the segments 3‘i—b ?t
ture of the sides 571 with the radially. inner por
within the indentations '43 on the upper segments
tion of the base 55) it is possible to attain a closer
3l—a and thus provide radial interlock between
?t between adjoining bases in the ?nal assembled
the segments. As shown particularly in Figure
ring. In this way, more nearly continuous and ->
10, radial oil-passageways 45 of generally triangu 20 uninterrupted surfaces are obtained in the upper
lar cross-section are provided by the sides 35 and
and lower cylinder-contacting ribs as is desirable,
I
The abutting edges of adjoining ?anges All
provide greater circumferential support and
By coining the fold-lines intermediate the
bases and theirsides in the manner described
minimize undesirable twisting tendencies in the 25 hereinabove in connection with the embodiment
I‘lIlg.
~
of Figures 11 and 12, it is possible to provide gen
In Figures .11 and 12, I have shown another
erally ?at shoulders throughout the entire radial
embodimentof the present invention. The em
dimension of the bases and thus to give still more
bodiment of Figures 11 and .12 generally re
nearly continuous and uninterrupted surfaces for
sembles that of Figures 1 to 6; the piston-ring
the cylinder-contacting ribs.
'
being made up of a plurality of identical inter
- The present invention may be embodied in
locking segments $6, each having a base M, con
other speci?c forms without departing from the
verging sides 48 having a gap 49 therebetween,
spirit or essential attributes thereof, and it is
and ?anges 59. Each base A? is provided with an
therefore desired that the present embodiments
inwardly-protruding button 5i, one edge'of eachv 35 be considered in all respects as illustrative and
. of the said segments being transversely 'oonvexly"
not restrictive, reference being had'to the ap
curved to provide a cylinder-contacting surface
pended claims rather than to the foregoing de
as described in connection with the embodiment
scription to indicate the‘scope of the invention.
of Figures 1 to 6. The ?anges 50 are provided
Having thus described my invention what I
with notches 52 at their free edges. However, the 40 claim as new and desire to protect by Letters
edges of the ?anges ~50 forward of the notches 52 ' Patent is:
are formed at an angle as at 53; the angled edges
1. An oil-control piston-ring comprising a plu
53 on the two ?anges 5d of each segment 136 con
rality of individual circumferentially-disposed
verging radially outwardly.
.
bent and folded segments of- sheet metal or the
As shown particularly in Figure 11, when the
like,‘ each of said segments being integrally
piston-ring is fully assembled, the angled edges
formed and having a base disposed in a generally
53 of the flanges‘ 50 form generally V-shaped
radial plane, a, pair of converging sides extend
notches adjacent the convexly-curved outer pe
ing generally axially from said base and having
riphery of the ring. As a, result of this construc
a gap intermediate their free ends, and a pair of
tion, the assembled piston-ring has greater in 50 ?anges extending generally circumferentially
herent radially-outward tension when installed
outwardly from the free ends of said sides, suc- '
upon a piston and within a cylinder and is par
cessive segments being alternately in upper and
ticularly well adapted for use where high unit
lower position with the ?anges of successive up
pressure is desired.
‘
In the embodiment of Figures 11 and 12 I have
shown the fold-lines intermediate each base it
and its sides 48 formed as stralght‘edges or
shoulders 53; the straight edges 63 being pro
duced by ‘coining or other suitable operations.
These straight edges 53 (as distinguished from
the rounded edges shown in Figures 1 to 10)
permit the adjoining segments of the ?nal as
sembled piston-ring to ?t more closely with one
another and thus to provide more nearly con
per segments disposed in abutting relationship
within the converging sides of the intervening
lower segment and vice versa.
_2. An oil-control piston-ring comprising a plu
rality of individual circumferentially-disposed
bent and folded segments of sheet metal or the
like interlockingly engaged in a complete more
or less continuous annulus, each of said seg
ments being integrally formed and having a base _ ' -
disposed in a generally radial plane, a'p'air or
. converging sides extending generally axially from
tinuous and uninterrupted upper and lower ‘ the sides of said base and having a gap inter
cylinder-contacting annuli.
1 to 6 and 7 to 10 could also be formed with
coined straight-edge ‘fold-lines if so desired.
mediate their free ends, and a pair of ?anges
extending from the free ends“ of said sides and
lying in a generally radial plane, successive seg
In Figures l3, l4 and 15, I have shown still
another embodiment of the present invention.
tionwith the ?anges of successive upper segments
, It is apparent that the embodiments of Figures
ments being alternately in upper and lower posi
The oil-control piston-ring of Figures 13, 14 and
disposed in abutting relationship within the con
15 is assembled from a plurality of identical in
verging sides of the intervening lower segment -
and vice versa, the sides and abutting ?anges of terlocking segments 55. Each of the segments 55:
includes a base 55 having an inwardly-protruding 75 successive upper segments and successive lower
2,410,452‘
. segments forming generally triangular radially
1
I
extending
oil-passageways.
‘
ing a gap intermediate their free ends, and a
pair or ?anges extending generally circurnieren
‘
3. An oil-control piston-ring comprising a plu
tially from the free ends of said sides, succes
rality of individual - circumferentially-disposed
sive segments being alternately in upper and
bent and folded segments of sheet metal or the
lower position with the ?anges of successive simi
larly-disposed segments arranged in abutting re
lationship within the converging sides of the in
tervening oppositely-disposed segment and vice
_ like interlockingly engaged in a complete more or
less continuous annulus, each of vsaid segments
being integrally formed and having a base, a
'
versa, and complementary locking meansv form
locking button protruding inwardly from said
vbase, apair of converging sides extending gen 10 ing part of the bases and ?anges of_ said seg
ments for providing radial interlocking inter
erally axially from the sides of said base and
mediate successive segments of the assembled pis
having a gap intermediate their free ends, and a a
pair or ?anges extending generally circumferen
,
ton-ring.
7. An oil-control piston-ring comprising a Plu
tially outwardly from the free ends oi said sides,
semi-circular 15 rality of individual circumferentialiy-disposed
.bent and folded segments of sheet metal or the ~
notches formed at their free edges, successive
like, each of said segments being integrally \
segments being alternately in upper and lower
formedv and having a base disposed in a gen
position with the ?anges of successive similarly
' said ?anges
having
generally
positioned segments disposed in abutting rela
tionship within the converging sides of the in
tervening oppositely-positioned segment, the jux
erally radial plane, a pair of converging sides ex
20
pair of ?anges extending generally circumferen
tially from the free ends oi‘said sides, successive
taposed notches Of said abutting ?anges ?tting
about said buttons and providing a radial inter
lock between segments.
. .
segments being alternately in upper and lower
position with the ?anges of successive similarly
disposed segments arranged in abutting relation
ship within the converging sides of the interven
-
4. An oil-control piston-ring comprising a pin
rality of individual circumferentially-disposed
bent and folded segments or sheet metal or the‘
like interlockingly engaged in a complete more
or less continuous annulus, each of said segments‘
being integrally formed and having a base dis
posed in a generally radial plane, a’. pair of con
tending generally axially from said base and
having a gap intermediate their free ends, and a
ing oppositely-disposed‘ segment and vice-versa, -
and complementary locking means‘ forming part
30 of the sides of said segments for providing radial
interlock intermediate successive segments for
verging sides extending generally axially from the
providing radial interlock intermediate successive
segments of the assembled piston-ring.
' , sides of said base and having a gap intermedi
.
8. An oil-control piston-ring comprising a plu
ate their free. ends, and a pair of ?anges ex
tending from the free ends of said sides and lying 35 rality _ of individual circumferentially-disposed
in a, generally radial plane, successive segments
bent and folded segments of- sheet metal or the
-~ like, each of said segments being integrally
being alternately in upper and lower position
vformed and having a base disposed in a generally with the ?anges of successive upper segments dis
posed. in abutting relationship within the con- i
radial plane, a pair of converging sides extend
verging sides of the intervening lower segment 40 ing generally axially from said base and having
and vice versa, the sides and abutting ?anges
a gap intermediate their free ends, and apair oi
?anges extending generally‘ circumferentially
(if-successive upper segments and successive low
er segments forming generally triangular radi- ‘
from the free ends of said sides, successive seg
ally-extending oil-passageways, the‘ sides of one
set of segments having locking buttons formed
thereon and'the sides of the other set 01 seg
ments being alternately in upper and lower posi
ments having corresponding indentations formed
thereon, said buttons and said indentations pro
viding radial interlock between said upper and
ship within the converging sides of the interven
tion with the ?anges of successive similarly
disposed segments arranged in abutting relation
ing oppositely-disposed segment and vice versa,
successive segments being provided alternately
with complementary buttons and indentations
for providing radial interlock therebetween.
' ‘~ lower segments.
5. An oil-control piston-ring comprising a plu
rality of individual circumferentially-disposed
9. An oil-control piston-ring comprising a plu
bent andv folded segments of sheet metal or the
rality of individual circumferentially-disposed
like, each of said segments beinginteg'rally formed
bent ‘and folded segments of sheet metal or the
and having a base disposed in agenerally radial 5
plane,- a pair of converging sides extending gen
erally axially from said base and havin'ga gap
like arranged in the form of a more or less con
tinuous annulus, each of said segments being
integrally formed and having a base, a pairoi'
converging sides having a gap intermediate their
free ends, and a pair of ?anges extending from
. free ends of said sides, successivesegments being (30 the free ends of said sides, successive segments
intermediate their free ends, and ‘a pair of ?anges
extending generally circumferentially from the '
being alternately in upper and lower position
‘ alternately in upper and lower position with the
‘ ?anges of successive similarly-disposed segments
’ arranged in abutting relationship within the eon
.‘ verging sides or the intervening oppositely-dis-'
with one side oi'each pair of successive upper
segments disposed within the converging vsides of
the intervening lower segment and vice versa,
> posed ‘segment and vice versa, and means form
radially inner portions of adjoining ?anges being
‘ ing part of said ‘segments for providing comple
disposed in abutting relationship while the radi
ally outer portions of said ‘adjoining ?anges
mentary radial interlock intermediate succes
sive
segments.
‘
.
’
- diverge outwardly from each other.
.
10. An oil-control piston-ring comprising a
6. An oil-control piston-ring comprising a- plu
plurality of individual circumferentially-disposed
rality of individual circumierentially-disposed
'bent and folded segments of. sheet ‘metal or the
i like, each of said segments being integrally '
formed and having a base disposed in a generally
radial plane, a pair of converging sides extend
ing generally axially from said base and hav
bent and folded segments of sheet metal or the ‘
like arranged in the form ‘of a more or less con
tinucus annulus, each of said segments being
integrally formed and having a base, a pair ‘of
75 converging sides having a gap intermediate their
2,410,452
.
free ends, and a pair of ?anges extending from
the free ends of said sides, successive segments
being alternately in upper and lower position
with one side of each pair of successive upper,
segments disposed _within the converging sides of
‘the intervening lower segment and vice versa,
in
bent and folded segments of sheet metal or the
like, each of. said segments being integrally
formed and having a base disposed in a generally
radial plane, a pair of converging sides extending
generally axially from said base and having a gap
intermediate their free ends, and a pair of ?anges
said bases having axially inwardly protruding
extending generally circumferentially outwardly
locking buttons formed thereon, said ?anges
from the free ends of said sides, successive seg
ments being alternately in upper and lower posi
10 tion with the ?anges of successive upper segments
disposed in abutting relationship within the con
having generally semi-circular locking notches
formed at their outer edges, the edges of adjoin
ing ?anges being disposed in abutting relation
ship radially inward of said notches and diverg
verging sides of the intervening lower segment
and vice versa, said sides ‘and said ?anges being
recessed from the outer edges of said bases
plurality of individual circumferentiallyedisposed 15 whereby said bases provide a pair of annular ax
ially-spaced cylinder-contacting ribs, the radially
bent and folded segments of sheet metal or the
outer portions of said bases having straight side
like arranged in the form of a more or less con
edges whereby more or less continuous straight
tinuous annulus, each of said segments being
line contact is provided at the radially outer porl.
integrally formed and having a. base, a pair of
converging sides having a gap intermediate their 20 tions of the bases of similarly-disposed segments.
ing radially outward of said notches.
. _
11. An oil-control piston-ring comprising a
free ends, and apair of ?anges extending from
the free ends of said sides, successive segments
15. For use in assembling an oil-control piston- '
ring, an integral segment of sheet metal or the
like having a base, a pair of converging sides hav
being alternately in upper and lower position
ing a gap intermediate their free ends, and a pair
with one side of each pair of successive upper
of ?anges extending from the free ends of said
segments disposed within the converging sides of
sides generally parallel to said base.
the intervening lower segment and vice versa,
16. For use in assembling an oil-control piston
radially inner portions of adjoining ?anges being
ring, an integral segment of sheet metal or the
disposed in abutting relationship while the radi
like having a base, a pair of converging sides hav
ally outer portions of said adjoining ?anges
diverge outwardly from each other, and means 30 ing a gap intermediate their free ends, and a pair
of ?anges extending from the free ends of said
forming part of said segments for providing
sides generally parallel to said base, said base
radial interlock intermediate successive segments
having an inwardly-protruding locking button
of the assembled piston-ring.
formed thereon, said flanges having semi-circular
12. An oil-control piston-ring comprising a
locking notches formed at their free edges.
plurality of individual circumferentially-disposed
17. For use in assembling an oil-control piston
bent and folded segments of sheet metal or the
ring, an integral segment of sheet metal or the
like, each ‘of said segments being integrally
like having a base, a pair of converging sides hav
formed and having a base disposed in a generally
ing a gap intermediate their free ends, and a pair
radial plane, a pair of converging sides extending
generally axially from said base and having a 40 of ?anges extending from the free ends of said
sides generally parallel to said base, said sides
gap intermediate their free ends, and a pair of
having a pair of locking buttons formed thereon.
flanges extending generally - circumferentially
18. For use in assembling an oil-control piston
outwardly from the free ends of said sides, suc
ring, a pair of integral segments formed of sheet
cessive segments being alternately in upper and
metal or the like, each having a base, a pair of
lower position with the ?anges of successive
converging sides having a gap intermediate their
upper segments disposed in abutting relationship
free ends, and a pair of ?anges extending from
within the converging sides of the intervening
the free ends of said sides generally parallel to
lower segment and vice versa, said sides and said
said base, one of said segments having a pair of
flanges being recessed from the outer‘edges of
said bases whereby said bases provide a pair of 50 locking buttons formed on its sides, the other of
said segments having a pair of locking indenta
annular axially-spaced cylinder-contacting ribs.
tions formed on its sides, one of said locking in
13. An oil-control pistonlring comprising a
dentations being complementary to one of said
plurality of individual circumferentially-disposed
locking buttons when said segments are in assem
bent and folded segments of sheet metal or the
like, each of said segments being integrally 55 bled position.
formed and having a base disposed in a generally
radial plane, a pair of converging sides extending
generally axially from said base and having a gap
intermediate their free ends, and a pair of ?anges
extending generally circumferentially outwardly
from the free ends of said sides, successive seg
ments being alternately in upper and lower posi
tion with the flanges of successive upper seg
ments disposed in abutting relationship within
the converging sides of the intervening lower
segment and vice versa, said sides and said
' ?anges being recessed from the outer edges of
said bases whereby said bases provide a pair of
annular axially-spaced cylinder-contacting ribs,
and complementary locking means forming part
of said segments for providing radial interlock
intermediate successive segments of the assem
bled piston-ring.
14. An oll~contrcl piston ring comprising a plu
rality of individual circumierentially-disposed
19. For use in assembling an oil-control piston
, ring, an integral segment of sheet metal or the
like having a base, a pair of converging sides hav
ing a gap intermediate their free ends, and a pair
60 of ?anges extending from the free ends of said
sides generally parallel to said base, one edge of
said segment being transversely convexly curved
and being adapted, to form part of the cylinder
contacting surface of said piston-ring.
‘ 20. For use in assembling an oil-control piston
ring, an integral segment of sheet metal or the
like having a .base, a pair of converging sides
having a gap intermediate their free ends, and
a pair of ?anges extending from the free ends of
said sides generally parallel to said base, one edge
of said segment being transversely convexly
curved and being adapted to form part of the cyl
' inder-contacting surface of said pistr ~-ring, the
side edges of said ?anges being tapered adjacent
the convex. edge of_ said segment.
2,410,452
v
11
21. For use in assembling an oil-control piston—
ring, an integral segment of sheet metal or the
like having a base, a pair of converging sides hav
ing a gap intermediate their free ends, and a pair
of ?anges extending from the free ends of said 5
sides generally parallel to said base, one edge
of said side and said flanges being-radially re
>
'
12
like having a base, a pair of converging sides hav
ing a gap intermediate their free ends, and a
pair of ?anges extending from the free ends of
said sides generally parallel to said base, one edge
of said side and said ?anges .being radially re
cessed from the corresponding edge of said base,
the sides of the protruding portion of said base
cessed from the corresponding edge of said base.
being formed as straight-line edges.
v
22. For use in assembling an oil-control piston- '_
WILLIAM S. LOEB.
ring,‘ an integral segment of sheet metal or the 10
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