Improvements in Pipe Joints.
Year: 1899

page_text: Improvements in Pipe Joints.
I, ALFRED BRANDT, of Uhlenhorst 2, Richterstrasse 15, Hamburg, in the
German Empire, do hereby declare the nature of this invention to be as
follows:-
This invention relates to improvements in pipe joints particularly designed
for high pressure pipes and comprises a novel construction of metal packing by
means of which a tight joint is obtained and any damage to the joint surfaces
by the fluid or the like flowing through the pipe is avoided.
According to the invention the joint is made by means of a circular metal
projecting edge which is pressed into a metal groove or recess; between this
metal joint and the interior of the pipe there is arranged a further automati-
cally acting elastic packing which has for its object to protect the metal packing
from contact with the water, air, etc., flowing through the pipe and to close any
fine pores which may exist in the ends of the pipe and which without this pro-
tection would be enlarged and give rise to leakages.
In carrying out the invention I solder or otherwise secure to the adjacent
ends of the pipe sections to be joined rings one of which is preferably made of
brass and is provided with a recess or groove having a joint surface. Into this
groove there extends an annular projection upon the other ring which is advan-
tageously made of steel. The projecting ring is formed at its outer part with
circular knife edges or undercut edges the outer of which forms the second joint
surface and when the two ends of the pipe are connected together is applied
against the surface of the other ring. The projecting ring is also provided
with a groove or recess.
The connection of the two pipe sections can be effected by means of an
external sleeve or nut or by other means, for example by flanges arranged behind
the rings and connected together by bolts: the connection by the external nut
has, however, the advantage of being easily applied and also of enabling the
joint to be made from the side so that the pipes can lie closely against a wall
or upon the ground when being fitted. The joint also takes up very little space.
In the annular space formed by the two grooves or recesses there is arranged
an elastic packing, preferably an india-rubber ring. By making the inside
undercut edge of the projecting ring somewhat shallower than the outer, the
liquid. air or the like which is contained in the pipes can obtain access to the
packing ring and exerts a pressure upon it so that it prevents the passage of
the water. etc. to the joint surfaces. The indiarubber ring, therefore, only
protects the metal packing from the inside of the pipe whilst the joint itself is
made by the metal surfaces. As the metal surfaces only require a relatively
small pressure to make a joint only a little force is required to be exerted in
practice: furthermore it is impossible to force out the india-rubber ring. In-
stead of screwing the rings which are to form the joint upon the ends of the
027

page_text: pipe sections packing or joint surfaces can be formed upon the pipe ends them-
selves, or instead of being formed as rings they can be formed as flanges.
Dated the 25th day of April 1899.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London,
Agents for the Applicant,
Improvements in Pipe Joints.
I, ALFRED BRANDT, of Uhlenhorst 2, Richterstrasse 15, Hamburg, in the
German Empire, 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:-
This invention relates to improvements in pipe joints particularly designed
for high pressure pipes and comprises a novel construction of metal packing by
means of which a tight joint is obtained and any damage to the joint surfaces
by the fluid or the like flowing through the pipe is avoided.
According to the invention the joint is made by means of a circular metal
projecting or knife edge which is pressed into a metal groove or recess; between
this metal joint and the interior of the pipe there is arranged a further auto-
matically acting elastic packing which has for its object to protect the metal
packing from contact with the water, air, etc., flowing through the pipe and to
close any fine pores which may exist in the metal and which without this pro-
tection would he enlarged and give rise to leakages.
In the accompanying drawing:
Figure 1 is a longitudinal section shewing my improved joint applied to the
adjacent ends of two pipe sections; and
Figure 2 is a section of a portion of the joint drawn to a larger scale.
In carrying out the invention I solder or otherwise secure to the adjacent
ends of the pipe sections a, a to be joined rings and e, one of which (the ring b
for example) is preferably made of brass and is provided with a recess or
grooved having a joint surface f. Into this groove there extends an annular
projection upon the other ringe which is advantageously made of steel. The
projecting ring is formed with circular knife edges, the outer of which h forms
the second joint surface and when the two ends of the pipe are connected together
is applied against the surface f of the other ring b. The projecting ring g is
also provided with a groove or recess i.
The connection of the two pipe sections can be effected by means of an
external sleeve or nut k or by other means, for example by flanges arranged
behind the rings b, c and connected together by bolts the connection by the
external nut has, however, the advantage of being easily applied and also of
enabling the joint to be made from the side so that the pipes can lie closely
against a wall or upon the ground when being fitted. The joint also takes up
very little space. In the annular space formed by the two grooves or recesses
and there is arranged an elastic packing, preferably an india-rubber ring 7.
By making the inside knife edge m of the projecting ring g somewhat shal-
lower than the outer or joint forming edge h, the liquid, air or the like which
is contained in the pipe can obtain access to the packing ring 7 and exerts a
pressure upon it so that it prevents the passage of the water, etc., to the joint
surfaces f. h. The india-rubber ring 7. therefore, only protects the metal packing
from the inside of the pipe whilst the joint itself is made by the metal sur-

page_text: faces f, h. As the metal surfaces only require a relatively small pressure to
make a joint only a little force is required to be exerted in practice; furthermore
it is impossible to force out the india-rubber ring. Instead of screwing the
rings b, which are to form the joint upon the ends of the pipe sections packing
or joint surfaces can be formed upon the pipe ends themselves, or instead of
being formed as rings they can be formed as flanges.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is:-
1. A pipe joint for high pressure metal pipes having a metal packing made
with a knife edge joint surface upon one of the pipe sections, a groove being
formed on the other pipe section and an elastic packing applied between the
aforesaid metal packing and the inside of the pipe sections, the said elastic
packing protecting the metallic joint surface from contact with the fluid flowing
through the pipe substantially as described and illustrated.
2. In a pipe joint of the kind described in Claim 1 the arrangement wherein
the groove is made in a recess in one of the rings secured to one of the pipe
sections and wherein the corresponding knife edge joint surface is formed on a
projection on the other of the rings secured to the other pipe section which said
projection enters and fits into the recess. the projection and the bottom of the
recess being provided with grooves together forming a space provided with an
elastic packing rin exposed to the interior of the pipe, substantially as described
and illustrated.
3. Pipe joints constructed substantially as herein before described and illus-
trated in the accompanying drawing.
Dated this 17th day of January 1900
G. F. REDFERN & Co.,
4, South Street, Finsbury, London,
Agents for the Applicant.