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Патент USA US2106792

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Feb. 1, 1938.
Filed July 5, 1935
B" 5.264161%.
Patented Feb.
19378.. a,
. 2,106,792
Donald s. Bruce, Sonnet-ville, and‘ Roy E. Berg,
Plain?eld,.lf{. J., assignors to Johns-Manville
Corporation‘, New :York‘, N..Y., a corporation
of New; York
Application July-5, 1935, Serial No. 29,928.
i 1 Claim.
(01. 154-28) ‘
This invention,__,relatestto a ‘vibration-damped
structure and to the
of making the .
damped structure made in accordance with the
invention. _'
There are shown vibration-damping material
I, suitably, a partially saturated felted sheet as
There" is .wide and'important use of vibration
5 damping material on_vibratile objects, such as described, a cementing layer 2 applied 'to a face 5
sheet metal panels of automobile bodies or home thereof, a vibratile object 3, such as thin sheet
'metal, and a very thinv ?lm- 4 including the vis
or o?ice furniture.
The type of vibration-damping material that. cosity-increasing agent and adhering the cement
is preferred for many uses is an incompletely
10 saturated felt ofrag ?bres or the like contain
ing, for?instance,‘ asphalt saturant in_- proportion
substantially. . less than“ thativpsed in making
‘saturated roo?ng felts ‘orfthe-‘like.
Such vibration-dampingmaterial, as sold orig
15 inally, is frequently provided with a preapplied_
layer of cementing material.‘ Thus, the cement
ing material may be applied in hardenable form,
as in solution in a volatilesolvent, to a face of
the vibration-damping material; the cementing
layer then caused to harden as by the evapora
tion of the volatile solvent therefrom, and --the
exposed face of the cementing layer softened, as
by brushing or spraying on of solvent, just be
fore application to the object the vibration of
25 which is to be damped.‘
While the method and structure described
have been used on a very large scale, certain dif
?culties have been encountered. Thus, special
care is necessary to avoid loosening’ of the-ad
0 hered vibration-damping material from the vi
bratile object.
' It is an object of the present invention to pro‘- .
vide a more certain method of securing the vibra
tion-damping material to the vibratile object.
ing layer 2 to the object 3.,
In making the vibration-damped structure 10
shown, there is‘?rst'provlded a partially sat
urated felt, a layer of suitable cementing mate
rial is. applied thereto, and the cementing layer
is caused to harden. The materials and the
steps in the preparation of the vibration-damp- 15
ing material, with preappll'ed cement layer, may
be those described in U. S. Patent 2,008,655, is
sued to George W. Clarvoe on July 16, 1935.
Thus,v the cementing layer may comprise‘ a vis
cous, water-insoluble, solvent-softening plastic 20
material, such as asphalt or a bituminous residue
from-petroleum distillation, and a filler. Prefer
ably, the composition comprises, also, a resinous
To the exposed face or surface of the preap- 25
plied cementing layer, there is applied a ?owable
mixture including a volatile solvent for the
cementing layer and a viscosity-increasing agent
associatedwith the said solvent, as by solution
or dispersion therein.
The mixture of solvent and viscosity-increas
ing agent is applied-to the. preapplied cementing
layer in any suitable manner, as by brushing,
rollerecoating, or spraying. There’ results at
35 Another object is to provide a special solvent‘ . once a softened surface of the vpreapplied-layer. 35
The composite is then‘ adhered to the vibratile
mixture for usein softening the cementing layer
before the damping material is applied to the ‘object, as by havingthe softened surface pressed,
vibratile object. Another purpose is to provide 'by a roller or otherwise, against the said object. e‘
The said solvent should‘be one that evaporates
‘ a vibrationedamping'structure of increased ?rm- '
reasonable time, permitting quickly adher- 40
4o ness of adherence between the several elements ingathe
vibration-damping material to the vibra
thereof. Other objects and advantages will ap
tile object. For best results, the rate of evapora
pear from the detailed description that follows. tion of the solvent should be of the order of that
In the preferred embodiment, the invention _of toluol, say, within the range ‘between the
comprises the method of and‘ the structure re
rates of evaporation of benzol, on the one side, 45
45 sulting from using a solution of volatile solvent and xylol, on the other.
and a viscosity-increasing agent associated there
A suitable solvent is'a mixture of 10 parts by
with, for softening the exposed face ‘of'the pre
volume ‘of solvent naphtha (from coal tar dis
applied cementing layer before‘ application. to tillation), 40 parts of carbon ~tetrachloride, and
50 the vibratile object.
-a '
50 parts of petroleum enaphtha of evaporation 50
The invention is illustrated in the drawing and
will be described, for the purpose of illustration,
in connection therewith.
The ?gure shows a plan view, partly broken
rate about like that of cleaners’ naphtha or
somewhat slower.
The viscosity-increasing agent should be a ma
terial of the type of rubber, that is, a material
55 away for clearness of illustration, of a vibration-' thatis adapted to be dispersed in the solvent-55
2 .
and increase greatly the viscosity of the solvent
creased tackiness or the super?cial portion, with
when used in such small amounts as not to af
out increasing, in proportional degree, the soft
fect substantially adversely the adhesiveness of
the face of the adhesive composition in contact
ness of the interior of the cementing layer. Also,
with the vibratile object in the ?nished assembly.
makes possible the smooth application of a. rela
the increased viscosity of the solvent mixture .
-tively thick coating of the said mixture over the'
Thus, there may be used t6 advantage, as viscos
, ity-increasing agents, rubber itself, preferably,’ preapplied cementing layer.
in unmilled form as gum balata, polymerized
chloroprenevof rubber consistency, and aluminum
stearate gel or about 2% concentration by weight
in the solvent mixture.
When rubber is 'used. it is used in a limited
, proportion only, as, for example, in the propor
tion of about two parts by weight or less to 100
Regardless of what the explanation of the cause
of the major advantage maybe“ we make use
of all of the advantages obtained, without regard
to the correctness of any theory.
The details that have been given areefor the
purpose of illustration, not restriction.
tions or departures therefrom which conform to
parts of the solvent- mixture. Preferably, there ' the spirit of the invention are intended to be
is used unmilled rubber in the proportion of included within the scope of the claim. *
What we claim is:
about two-thirds part by weight to 100 parts of
In making a vibration-damped structure in
solvent: When other materials are "substituted
for rubber, as the viscosity-increasing agent, var- ‘ cluding a vibratile object, the method which in
ious proportions‘ may be used, depending upon cludes providing a vibration-damping sheetkap
the viscosity produced by a given amount of the plying a layer of hardenable bituminous cement
agent. In general, a viscosity approximately ing material to a face of the sheet and causing
the said layer to harden, applying to the exposed
equal to ‘that produced by the preferred propor
tion of unmilledrubber is satisfactory, and the face of the hardened layer a ?owable mixture
including rubber dissolved in a volatile solvent for
25 selected agent may be used in such a proportion
the cementing material, to soiften the said ex
as'to give such viscosity.
- '
posed face, .and then adhering the product by
» Excellent adherence is obtained when the
means of the softened face to the vibratile object,
method andcomposition desired are used.~
the proportion of the rubber being adequate to
Once the bene?cial results have been observed,’ increase substantially the viscosity of the said '30
various theories may. be advanced to ‘explain solvent but not substantially in excess of about
them. Thus, the increase in viscosity, due to two parts by weight .to one hundred parts of the
the use of rubber or the like, decreases the rate
of di?usion oi the solvent mixture into the pre
130mm s. BRUCE. " ’
35 applied cementing layer and thus causes in
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