Year: 1894

page_text: Date of Application, 3rd Dec., 1894-Accepted, 5th Jan., 1895
A communication from HEINRICH ENGLER, of Crossen, near Zwickau, Kingdom
of Saxony, Germany, Works Manager.
1, ALFRED JULIUS BOULT, of 323 High Holborn in the County of Middlesex,.
Chartered Patent Agent, do hereby declare the nature of this invention and
in what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement:—
This invention relates to a packing of lead for steam or other joints, wherein,
between two metal-plates joined together at the inner edge an asbestos plate is
inserted. These packings are frequently used with high steam-pressure and resist
all influences, as any overheating of the asbestos layer, saturation with oil or
condensed water, or disturbance through acids and the like, is effectually prevented
by the lead-casing.
Moreover the use of the lead offers, in comparison with other metals, the
exceptional advantage, that by reason of its ductility it easily adapts itself to the
irregularities of the packing, and its structure alters very immaterially as compared
with other metals. The union of a lead casing with an asbestos inner layer, and
the parts of the packing closed and turned to the working side, is for that reason
especially adapted for use with boiler-fittings, and further offers quite exceptional
advantages over other packings, as it has a greater capability of resistance against
high steam pressure and acids, and is at the same time, owing to the asbestos lining,
better suited to withstand the highest pressures, and can be more frequently used.
In slide-valve casings, other packings are ultimately saturated and softened by the
oil which is to be found there, whereby occasion is given to the steam and condensed
water to penetrate the packing, while on the other hand rubber is overheated and
burnt by high steam pressure.
To these evils the lead with asbestos lining packing is not exposed, since the
latter on the working side, is completely enclosed by the lead covering, which
prevents the penetration of liquids.
In steam pipes and connections, the lead follows the creases of the packing, while
the pipe is warm, and expands so as to fill up all irregularities. When the pipe
cools, and contracts, or shortens, the packing maintains its tightness, inasmuch as
the outer unfastened wings of the packing go apart from one another. The
continual and troublesome leakage at the joints of the steam-pipes is thereby
prevented.
If the outer edges of the packing are also soldered together, it is entirely steam
and water tight and shut off from all external and internal influences, whether of
heat or moisture.
Such a packing resists penetration by a volatile gas at a temperature of
200° Centigrade and external sprinkling of the steam pipes with water, influences
which hitherto no packing has been able to resist.
In the accompanying drawings
Figure 1 is a view of a rectangular packing, partly in section.
Figure 2 is a transverse section of the same showing the lead casing as closed
only ou the inside.
Figure 3 is a view of a circular packing, partly in section.
Figura & is a transverse section showing the lead casing as closed at both sides.

page_text: A indicates the lead casing of the packing which may be closed on the inner
or working side, or on both sides, and may be composed of two strips of rolled
lead.
B is the enclosed layer of asbestos, filling the space between the lead strips, and
pressed closely between them.
Having now particularly described and ascertained the nature of the said inven-
tion as communicated to me by my foreign correspondent, and in what manner the
same is to be performed, I declare that what 1 claim is ;-
Lead packing with an asbestos lining for boiler fittings steam connections and
the like wherein the asbestos lining such as B is enclosed between lead sheets such
as A fastened together at both sides or at the inner or working side only and may
be left open at the outer side to admit of expansion or contraction.
Dated this 3rd day of December 1894.
BOULT & WADE,
Agents for the Applicant.