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Патент USA US2409446

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l 2.1 %” 1946
’ 2,409,444
v
.. is!) STATES PATENT I 0
2,409,444
FFlCEY
CLOCK LUBRICANT
John D. Morgan, South Orange, and Russell E. '
Lowe, East Orange, N. I... assignom to Cities
Service Oil Company,
poration of PennsylvaniNew York, N. Y., a cor
No Drawing. Application August 14, 1944.
Serial No. 549,494
‘
.
'
» 2 Claims. ‘(or 252-494;)
‘This invention relates to lubricants and more
particularly to compositions for lubricating elec
tric clocks, chronometers and similar precision
timing devices.
' r
-
2
‘ country and are readily available on the open
market.
The production or our lubricant does
not depend, thereioraupon the availability 01'
ingredients which must be imported from abroad,
The small synchronous electric motors, and as
as do many timepiece and other special oils, and
sociated gear trains, which constitute the timing 5 the
product can be made and sold at a compara
units of most electric clocks and similar chronoé ' tively
low cost.
phic devices. raise lubrication problems which
One
speci?c example or a lubricant which is
not answered by any 01' the normal time
well suited to the lubrication of elec
piece oils, nor even by many of the special oils 10 particularly
tric
clocks
and
similar devices has the following
which are prepared for this speci?c work. As a
uenerel rule the bearings and other moving parts
~
Percent by weight
of these motor units are lubricated but once, at
Tricresyl phosphate. _..-....-.._..-....-..--_---..-..- 0
the time oi manufacture, and the lubricant must
Di butyl phthalate ____________________ __-..__ 20
lost for the full life of the device. It is accord I5. Tri ethylene glycol di-Z-ethyl butyrate-r_--_ 30
inaly cmential that the lubricant shall be chem- '
The resulting oil-like product has'a kinematic
ically stable to a high degree, resisting oxida
tlon and polymerization, both of which chemical ' viscosityloi 13.49 centistokes at 100° F., a value
formula:
'
v
which is recognized as substantial at this high
catine‘ values. A further requirement is that the 20 temperature and as being entirely adequate for
the lubrication oi.’ electric'clock bearings. When
lubricant must have an extremelyvlow volatility
the temperature of the liquid is dropped to --l0°
so that it will not evaporate during the life of
F., its viscosity increases to a value of only 380.4
the timing mechanism and leaving the bearings centistokes, which for this temperature is fairly
and other parts dry. Obviously in service of this
low. Both the pour point and the cloud point
hind it is very important that the lubricant shall - 25 of
the liquid are at some temperature below
not attack the bearings, pivots. and gears. and
‘ —60° 11., thus indicating that the composition
that it should tend to protect those parts from
does not begin‘ to separate into its components
corrosion by the water vapor. and oxygen oi’ the
nor to freeze at any temperature at which elec
atmosphere.v In addition to all of the foregoing.
is essential thatthe lubricant shall not react 30 tric clocks can be expected-to operate. It will
be evident from the foregoing that the viscosi_
with or dissolve the painted and lacquered dials
ties of our ?uid may be said to be low, that they »
and other parts 01' a clock mechanism which ac-'
remain relatively constant over a wide range of
tion would tend to destroy the utility of both the
temperature. and that these properties are well
cficvice and the oil itself.
within the viscosity-temperature speci?cations
‘The principal object or the invention is to pro
vide a lubricating oil which. is chemicallv stable 35 laid, down by the leading manufacturers of elec
trio clock mechanisms for lubricants vfor their
over estencied. periods of time. has a relatively
reactions tend to change the viscosity and lubri- .
timing mechanisms; .
'
‘low viscosity over a wide range of temperatures.
'
The volatility oi’ the composition is extremely
.hich is non-corrosive to metals used in the‘
low.
Upon test in an open cup. a sample 01' our
wustruction of electric clocks. and has no sol 49 ?uid showed
a loss 01' only'lour tenths of one per
‘i‘dl’lt or chemical effect upon the paints and lac
cent after being held at a temperature of 160°
liuere normally‘ used in such devices.
F. for 500 hours.
, y
‘it is a further object of the invention to pro
The
chemical
stability
of
the ?uid is excellent.
vide a time piece lubricant which is better adapt
is. or course, free, 01' gum when ?rst prepared,
ed to meet lubrication requirements of synchrof 5 It
and long exposure at high temperature does not
nous electric clocks than any of the lubricants
seem
to produce any undesirable residues. A thin
now available for this purpose. and which may
?lm oi the liquid was held at a temperature of
manufactured at a comparatively low cost
160° F., for example, forsome 300 hours-after
from synthetically prepared lnrzredients that are
which it showed no tack development or other
readiiy available in the domestic market.
indication of deterioration. At more moderate
We have discovered that very satisfactory 50‘ temperatures
of the
order of normal room. tem
lucants can be prepared from mixtures of tri
peratures, there is no evidence of oxidation and
phosphate: di butyl phthalate; and tri
gumming, even after very extended periods of ex
ethyiene glycol di~2-ethyl butyrate. These in
posure.
'
crements are all prepared synthetically in mm on
A further feature of the advantage of this
2,409,444.
a
.
lubricant is its very low spread factor. Thus, the
liquid tends to stay in the place in whichit is
put and not to creep away to surrounding‘ sur
faces. We have found, for example, that the
lubricant does not tend to spread away from the
main shaft of the timing unit to the dial of an
electric clock, nor to_oreep around the'edge of
4
within the following range: tricresyl phosphate
40 to 60 percent; di butyl phthalate 25 to 15
percent; tri ethylene glycol dl-2- etc. 35-25 per
cent, the percentages being by weight.‘ All of
these compositions have good lubricating prop
erties, are stable and resist gum-forming tend
encies for long periods of time, and have little
or no action uponlithographic paints. The per
centages of the individual ingredients may be
The solvent action of the lubricant upon lithc- Y adjusted, to bring out one or another of these
10
graphic paints and lacquers was tested by im
properties for‘the purpose of meeting the special
mersing llthographed clock dials in the lubricant }
requirements of individual problems.
time
and
at
temperatures‘
for extended periods of
Having described our invention what we
well in excess 01' normal summer heat. ' At the
claim is:
conclusion or these tests the dials showed no ill
1. A lubricant consisting essentially of a mix»
e?ects. The lubricant exhibited no tendency to 15 ture of from 40 to 60 percent of tricresyl phos
remove the lithographic paint, or to soften it in
phate, from 25 to 15 percent of di butyl phthalate,
the least.
and from 35 to 25 percent of triethylene glycol
The ?uid has no corrosive action upon steel,»
di-2-ethylbutyrate, all of said percentages being
copper, and brass or other metals normally used
by weight.
20
in clock manufacture. In fact its presence on
2. A lubricant for electric clocks and the like
pivots, bearings, etc., serves to prevent rusting
consisting of about 50 percent by weight of tri
and atmospheric corrosion.
' cresyl phosphate, about 20 percent by weight oi!
The foregoing composition is an ideal lubricant
di butyl phthalate, and about 30 percent by
for lubricating electric clocks and the like, be
weight of triethylene glycol di-2-ethylbutyrate.
the case, etc.
'
- cause of its unique properties that particularly
suit it for that type of service. We have found,
however, that other desirable lubricants may be
prepared from mixtures of these same ingredients
1
JOHN D. MORGAN.
RUSSELL E. LOWE.
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