Harrisburg telegraph. [volume] (Harrisburg, Pa.) 1879-1948, 1919-09-13
NEW PRINCIPLES
ARE EMBODIED in
US. TRUCK TIRE
Solid Truck Tires Now on the
Market Receiving Consid-
cradle Attention
(By c. X. Whiddcn, Manager Solid
Truck Tire Dept, United States
Tire Company

After long period of experiment
tation a new solid truck tire en-
bodying two entirely new principles
of construction is now being placed
on the market by the United States
Tire Company.
The two new principles involved
in the manufacture of this tire are
so radically different from all other,
existing methods of manufacture
that they are attracting close atten-
ton from tire engineers. Many I'M
provements in solid tire manufac-
ture have been made since the ad-
vent of the motor truck, but for
none of them have the broad claims
been made which are made for this
new tire.
one of the claims made is that a
method has been discovered of eliml-
mating the grain" in the rubber and
thus greatly reducing splitting and
cracking, one of the chief causes of
trouble in solid tires. The other is
that long step forward has been
made in solving the problem of pre-
venting tires from separating from
the tire bands.
With regard to this second claim.
IL is pointed out that it has been the
custom until now to fasten the rub
Der tire to the steel base by means
OF dove-tailed grooves in the steel
band. This union was mechanical
ana served the purpose of holding
the rubber on the band with vary
ing degree of success.
The United States Tire Company's
laboratories have discovered a new
process which enables them to form
chemical union between the steel
and rubber and at last are able to
announce that rubber can be vul-
canized to steel, provided the steel
Is treated in the peculiar manner
developd by thir chemists. This fea-
ture will practically eliminate base
separation, one of the most bother
some OF all solid tire troubles
Ihe other important improvement
embodied in the new tire relates to
the rubber itself and is the result
OF long study of rubber and rubber
com pounds.
Everyone is familiar with the fact
that many materials possess n
marked grain. This has been noticed
particularly in wood and in some
rock. formations, but it has not been
generally known that it is also a
characteristic of rubber. Rubber
mas grain of spiral formation
which, while invisible, is neverthe-
less present. When the rubber tire
with this grain is affected by over
loading or rough usage, it will chip
or crack in the sides or wearing sur
races. The cavities formed as a re-
suit OF this condition are usually
rounded in contour and follow the
grain of the stock just as wood will
always split along the grain and as
rock formations split on the exposed
surface along the various strata. The
stratlhcation in solid tires is almost
universally of double spiral form and
is caused by the mechanical working
TO which the rubber stock is sub
1ected in the process of manufac-
ture.
The development of this tire is
another important contribution by
the United States Tire Company 10
the progress of the motor truck in
dustry. During the past decade this
industry has gone forward with giant
strides, but its success has depended
to large extent upon the ability
or tire manufacturers to meet the
demands due to changed conditions
In tfe early days Of the motor truck
these vehicles were built to carry
light loads and it was a compara-
lively easy matter for tire manufDc-
turers to furnish adequate tires. hut
the size of trucks and the weight of
loads has increased rapidly, until to-
day tire manufacturers are required
to furnish tires capable of standing
up under loads of seven or eight tons.
The laboratories of the United States
Tire Company have, in perfecting
this new tire again co-operatod with
truck manufacturers to bring the
whole industry to a new level of eff
| ficiency.
The new tire has been thoroughly
tested by the company in accord
ance with its fixed plan to place
nothing new on the market until it
has met the most rigid tests.