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Патент USA US2407192

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Sept. 3, 1946.
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R. R. TEETOR
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2,407,192
PISTON
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Filed May 25, 1944 '
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INVENTOR.
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Patented Sept. 3, 1946
2,407,192
UNITED, STATES PATENT [oi-"rice ; ‘v
The Perfect Circle, Company, Hagerstown, Ind., “
a corporation of ‘Indiana
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Application May 25, 1944,‘ Serial No. 537,252‘ '
4 Claims.
(Cl. 309-13)
1
.2,
thread l2. Tightly wound‘ in each spiral-thread‘:
This invention relates to pistons adapted more
particularly for use in internal combustion en
is a wire I3.‘ " Part of the wire in .the lower groove
gines.
is shown broken away in Fig. I.
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The main object of this invention is to provide
In applying each‘ wire bandVIS ‘to its groove;
a light-weight, simple and inexpensive piston 5 one‘ end of thefwire is thrustthrough a round
which will afford, throughout the operating tem
hole 15 (Fig. 3) in the piston skirt atone endwof
peratures ‘and speedranges of the engine, the
the spiral groove, and the projecting extremity of
most efficient clearance between the piston skirt p the wire within the‘ski'rtis then bent ‘at right
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angles, as shown in Fig. 3, to ?rmly anchor'the‘
More particularly, I provide a piston, having‘ 10 end of the wire. If desired, the extremityof the .
a slotted skirt formed of aluminum alloy or simi
wire may ?rst be “bent "at‘rightangles and "then
lar light-weight material, with one or more
the other end of the wire may be threaded through‘
bands of wire wound spirally andtightly around
the hole‘ Hi from the inside of the skirt and the
and the cylinder wall.
the skirt of the piston to reduce the uncon?ned
wire drawn through the‘ hole. “ The wire is then .
wound under‘ considerable tangential tension or
diameter of the piston, the'wire being formed of
a-metal having a coe?icient of expansion lower
than that of the skirt and approximating that
of the metal of the engine cylinder. The ends of
the wire are secured‘or anchored to the skirt.
My invention eliminates piston skirt collapse, pis
pull in the‘spiral‘thread-,"the tension being such;
that the force ‘exerted "reduces the, ‘uncon?ned
diameter of‘ the skirt‘ to its‘ ?nal desiredeilfe'etive
diameter. It will be understood that the diameter
20 may be so reduced because of the vertical slot 1b,
which is partially closed. By “uncon?ned diam
eter,” I mean the diameter of the skirt at around
room temperatures, after the skirt is slotted and
ton slap, excessive wear and scu?ing, and also
provides better oil control.
Other objects and advantages will become, ap
parent as this description progresses and by ref
erence to the drawing, wherein
finished but before the wire bands are applied.
In order to anchor the other end of the wire,
I provide the skirt at the other end of the spiral
Figure 1 is an elevational view of one form of
thread with a horizontal slot IS. The wire near
tpiston, constructed in accordance with my inven
the end of the last turn is temporarily clamped
ion;
against movement and then the free terminal of
Fig. 2 is a similar view of the piston, taken,
at 90 degrees to Fig. 1;
30 the wire is pushed into the slot, as indicated by
‘the dotted lines I‘! in Fig. 3, and then while a
Fig. 3 is an enlarged detail vertical section,
taken on the line 3-3 of Fig. 2; and
pull, as with pliers, is exerted on the terminal, it
is bent into a hook around the adjacent end of
Fig. 4 is an enlarged detail horizontal section
taken on the line 4-4 of Fig. 3.
the slot, as shown in Fig. 3. The clamping means
The piston is made of an aluminum alloy or a 35 on the wire is then removed, the end of the wire
being ?rmly fastened to the skirt.
similar metal which is light in weight and has a
Each wire is formed of a metal having a coe?i
higher coef?cient of expansion than the cast iron
cient of expansion lower than that of the metal
or steel wall of the engine cylinder in which it is
of the skirt and approximating the coe?icient of
to operate. I have illustrated the piston as hav
ing a head 5 and an integral skirt 6 which is pro 40 iron or steel. The wire may be formed of carbon
steel and may be similar to that used in musical
vided with a T-shaped slot 1 consisting of a
instruments. I prefer to use a wire having a di
horizontal slot ‘la adjacent the head and a ver
ameter in the neighborhood of .050 of an inch.
tical or longitudinal slot ‘lb extending from the
It will be observed that the outer portions of
slot ‘la to the lower edge of the skirt. The ver
the turns of each band extend slightly, that is,
tical slot 1b is midway between the piston pin
around .005 of an inch, beyond the outer cylindri
bosses, the openings through which are illus
cal surface of the skirt, though, in the broader
trated at 8 in Figs. 1 and 2. The piston, as far
aspects of my invention, the turns may be ?ush
as has been described, is of a well-know type
but I do not intend to limit my invention thereto,
with this surface or even inset with relation to it.
as my invention is adapted for use in any type of 50
It is well known that pistons formed of alumi
piston having a skirt with a longitudinal slot.
num alloy and the like have a much higher coeffi
Formed in the outer surface of the skirt are
cient of expansion than cast iron or steel, of
grooves, preferably two, one 9 near the top of the
which the cylinder, in which it operates, is formed,
skirt and the other l0 ‘near the bottom of the‘
and that the slotted skirt tends to collapse, with
skirt. Each groove is provided with a spiral
resultant piston slap, when the engine is cold, and
26
2,407,192
3
4
if rigid enough to resist collapse, the skirt expands
and exerts pressure against the cylinder wall,
the slotted portion of the skirt and compressing
the skirt to reduce its uncon?ned diameter to its
?nal e?’ective diameter, with the outer portions
of the turns of wire projecting beyond the outer
surface of the skirt to provide a bearing adapted
when hot, with resultant excessive wear and
scuffing. I have found that with my invention,
the skirt, having its uncon?ned diameter reduced
by wire bands, which constantly compress the
skirt, the latter may be given su?icient rigidity
to prevent collapse when cold, while, at the same
time, the wire bands expand and permit the skirt
to- expand when hot, in substantially the same
ratio as the expansion of the cylinder wall, so:
that the most effective clearance is maintained
and undue wear and scu?ing are overcome.
With the outer portions of the. turns of the wire
to engage the wall of the cylinder, and means for
fastening the ends of the wire to the skirt.
3. In a piston for use in a cylinder‘ of an in
ternal combustion engine, a piston skirt provided
with a longitudinal slot and a circumferential
groove with a spiral thread and formed of metal
having a coefficient of expansion higher than that
of cast iron or steel, a wire formed of metal
having alower coe?icient of expansion than that
bands projecting slightly beyond the outer surface l5 of the skirt and. tightly wound in the spiral thread
of said groovev in a series of turns around the
of the piston, the bands, in my judgment, form 3;’
slotted portion of the skirt and compressing the
excellent bearings for the skirt against the cylin
der wall.
I claim:
.
1. In a piston for internal combustion engines,
a piston skirt provided with a’ longitudinal slot '
and formed of metal. having a coef?cient of ex
pansion higher than that of cast iron or steel, a
wire formed of metal having. a lower coe?icientof
expansion than that of the skirt and tightly wound
in a series of turns around the slotted portion of
the skirt andv compressing the skirt to reduce its
skirt to reduce its uncon?ned diameter to its
?nal e?ective diameter, and means for fasten
ing the ends‘ of the wire to the skirt.
4. In a piston for use in a cylinder of an inter
nal combustion engine, a piston skirt provided
with a longitudinal slot and a circumferential
groove with a spiral thread and formed of metal
having a coe?icient of expansion higher than that
of cast iron or steel, a wire formed of metal hav
ing a lower coefficient of expansion than that of
the skirt and tightly Wound in the spiral thread
eter, and means for fasteningv the ends of the
of said groove in a series of turns around the
wire to the skirt. ;
30 slotted portion of the skirt and compressing the
2‘. In a piston for use in a cylinder of an inter
skirt to reduce its uncon?ned diameter to its
nal. combustion. engine, a piston skirt provided
?nal eifective diameter, with the outer portions
with a longitudinal. slot and a circumferential
of the turns of wire projecting beyond the outer
groove and formed of metal having a coefficient
surface of the skirt to‘ provide. a bearing adapted
of expansion higher than that of cast iron or steel, 35 to engage the wall of the-cylinder, and means for
fastening the ends of the wire to the skirt.
a wire formed of metal having a lower coe?icient
of expansion than. that of, the skirt and tightly
wound in said groove in a seriesof turns around
RALPH R. TEETOR.
uncon?ned. diameter to its ?nal e?ective diam
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