Year: 1888

page_text: 1, REINHARD MANNESMANN of Remscheid Remscheid Bleidinghausen in the.
Empire of Germany, Engincer do hereby declare the nature of this invention to be
as follows
Columns, when they are made of cast iron, are liable to crack and give way in
case of fire, and when they are wrought iron or steel tubes, they are liable to bend
and buckle in case of fire This invention relates to a construction of metallic
colunins such as protects them from the destructive influence of fire
For this purpose
each column is made to consist of two tubes, preferably of steel, the one within tho
other, each, or more particularly the inner tube, being strong enough to support con-
siderably more than the load which the two together have to bear Between the one
tube and the other there is an annular space, which in most cases need not exceed
half an inch in width and this space is filled with material such as asbes'os which is
incombustible and a bad conductor of heat In case of fire, although the outer tube
may be greatly heated and consequently weakened, the inner tube remains compara-
tively cool retaining sufficient strength to support the load
1000
ABEL & IMRAY;
Agents for the Applicant

page_text: An Improvement in Fire Proof Columns
I, REINHARD MANNESMANN of Remscheid Remscheid Bleidinghausen in the
Empire of Germany, Engineer, do hereby declare the nature of this invention and
in what manner the same is to be performed to be particularly described and ascer-
tained in and by the following statement
Columns, when they are made of cast iron, are liable to crick and give way in
case of fire, and, when they are wrought iron or steel tubes, they are liable to bend
and buckle in case of fire This invention relates to a construction of metallic
columns such as protects them from the destructive influence of fire For this purpose,
each column is made to consist of two tubes, preferably of steel, the one within the
other, each, or more particularly the inner tube, being strong enough to support
considerably more than the load which the two together have to bear Between the
one tube and the other there is an annular spice which in most cases need not exceed
half an inch in width and this space is filled with material such as asbestos, which_18,
incombustible and a bad conductor of heat In case of fire, although the outer tube
may be greatly heated and consequently weakened, the inner tube remuns compara-
tively cool retaining sufficient strength to support the load
The accompanying drawing is a vertical section of a column according to this
invention Between a base B and a cap Care secured two concentric tubes A, D,
preferably of steel, the inner tube D being itself more than sufficiently strong to
withstand the strain to which the column is subjected The annular space E between
the two tubes is filled in with material, such as asbestos, slag wool, or it may be
cement, which is incombustible and a bad conductor of heat, so that notwithstanding
the weakening of the outer tube A by heat, the inner tube remains comparatively
cool and supports the load on the column
Having now particularly described and ascertained the nature of this inven
tion and in what manner the same is to be performed I declare that what
I claim is
-
The construction of a fire proof column consisting of two concentric tubes having
between them an annular space filled with suitable material substantially as described
Dated this 8th day of April 1889