Year: 1893

page_text: Date of Application; 29th May. 1893-Accepted, 8th July, 1893
ние ахтапу WICHIT the other in comOT
with a stuming-DOX, constructed as
hereinafter described, for maintaining a tight joint between said sliding parts. Our
Baid improved expansion-joint is provided with means to limit or determine the
permissible extension thereof.
Referring to the accompanying drawings.
Figure is a central longitudinal section of an expansion-joint constructed
according to our said invention.
Figure 2 is a side elevation, and
Figure 3 is an end view of the same.
Figure 4 is a central longitudinal section of an expansion-joint intended for
pipes of larger diameter than those for which the joint shown in Figure 1 is
intended.
Figure 5 is an end view of the same.
Like letters of reference denote corresponding parts in all the Figures.
A is a short pipe adapted at one end to be connected to a range of pipes and
enlarged as shown at A¹ to form a socket to receive one end of another short
pipe B.
The other end of said pipe B is adapted to be connected to a range of
pipes. The pipe B can slide in and out of the socket A¹ and will allow for
expansion and contraction in an axial direction in a well known manner.
The socket A' is further enlarged at the end to form a stuffing-box, the interior
of which is coned at the lower or inner end A³. C is a conical annular bush
adapted to fit said coned part and also to fit around the inner pipe B. Said bush C
is preferably made of asbestos fibre and powdered plumbago cemented into a
homogenous mass by vulcanization. The space between the large end of the
cone C and the gland or cap D is packed with soft or yielding packing E consisting
for example of fibrous asbestos and plumbago or other suitable soft packing used
with or without a lubricant.
When the gland D is set down by the usual means provided for the purpose a
uniform flexible pressure is exerted on the bush C which forces said bush into its
conical seat with sufficient pressure to make a fluid-tight joint around the cone and
between the cone and the inner pipe B. The top fibrous or other yielding
packing E is protected by the bush C from contact with the fluid in the pipes and
its efficiency for the required purpose is thus maintained unimpaired. This
construction of stuffing-box does not require a large amount of flexible packing
material and the pressure required to maintain the same perfectly tight is not so
great as is the case in ordinary stuffing-boxes wherein the packing must be
compressed very tight to make it sufficiently solid to resist the action of the fluid
under pressure
in the pipes. Hence our improved expansion-joint will work with
considerably less friction than would be the case were the stuffing-box packed in
the ordinary manner.
The bush C may have any desired shape at the top, that is to say, it may be
round, hollow, flat or coned."

page_text: In order to prevent the pipe B being drawn out too far we provide stops
comprising bolts F or equivalent studs or pins secured at one end to the flange or
other part of the pipe A, preferably one on each side thereof, and passing through
holes formed in lugs B¹ cast or fixed to the sides of the pipe B as shown in
Figures 1 to 3, or the bolts can be secured to the pipe B and pass through holes
formed in part of the pipe A on the flange thereof as shown in Figures 4 and 5.
Said bolts are provided with nut F' which can be adjusted to the desired position
on the bolts and then fixed by pins F2 or otherwise. Where studs or pins are used
in lieu of bolts, they are fitted with cottars passing therethrough to engage the
lugs B to limit the outward travel of the pipe B.
Figures 1 to 3 illustrate an expansion-joint intended for comparatively small
pipes up to say two inches in diameter. For such small pipes the expansion-joint
is preferably made of brass or gun metal. Larger expansion-joints such as shown
in Figures 4 and 5 are preferably constructed with flanged ends which are adapted
to be connected with the line of pipes by bolts in the usual manner.
According to another part of our invention where the expansion-joints are made
of iron, we sheath or cover the part B with a thin shell of brass or gun metal for
example to prevent corrosion.
In the drawing we have shown the pipe B covered with a brass shell B' which is
bored truly to fit tightly on said pipe Band is flanged at its outer end and bolted
to a flange B formed on the pipe B. A good steam-tight joint is made between
the flange of the brass sheath B2 and the flange B³ of the pipe B to prevent
leakage while the barrel portion of the sheath is left free to expand. Said shell B
may however be secured in any other suitable or convenient manner.
gland D may also be sheathed in brass as shown at D' for the same purpose.
The
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we declare that what we
claim is :-
1. An expansion-joint having a stuffing-box fitted with a conical bush, and with
or without stops for limiting the extension of the joint, substantially as, and for the
purpose, specified.
2. In such expansion-joint the brass or gun metal sheath B2 secured to the
pipe B by means of a flange or its equivalent at one end as, and for the purpose,
specified.
3. An expansion joint constructed substantially as described with reference to
Figures 1 to 3, or to Figures 4 and 5 of the drawings, and operating as, and for
the purpose, specified.
Dated this 29th day of May 1893.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicants.