Year: 1894

page_text: Date of Application, 21st Mar., 1894
Complete Specification Left. 17th Dec., 1894-Accepted, 9th Feb., 1895
We JAMES ASHTON FLETCHER, SAMUEL FLETCHER, and JACKSON
FLETCHER, all of Borough Brass Works, Ashton-under-Lyne, in the County of
Lancaster, Brass Founders do hereby declare the nature of this invention to be as
follows:-
Our said invention relates to an improved construction of plug cocks for fluids
under pressure.
In a plug cock made in accordance with our said invention we use a cylindrical
plug provided with the usual ways or passages and which rests at the bottom on an
annulus of packing material supported by a stool or block lying loosely in the
casing of the cock. The bottom of the plug is solid in order that the fluid may
exercise pressure thereou in such a way as to counteract the fluid pressure on the
upper part of the plug. Any tendency of the plug to rise by the action of fluid
pressure is thus eliminated and the function of the packing at the top of the casing
is merely to prevent the escape of the fluid.
At the upper part the plug is provided with a shoulder against which bears the
projecting inner rim of a metal gland connected to the casing by bolts or screws.
For the purpose of packing the plug at the top a recess or stuffing box is formed
in the casing about the upper end of the plug to contain the packing material.
Resting on the packing material is a ring the upper face of which takes against the
under flat face of the bereinbefore mentioned metal gland. For packing the plug
at the sides the usual packing material in slots parallel to the cock is used and the
hereinbefore mentioned inner rim of the gland presses thereon.
By tightening the bolts of the gland the projecting rim thereof forces the plug
against and compresses the bottom packing while the under face of the gland bears
on the ring lying over the packing in the stuffing box at the top of the plug and
compresses the latter.
The advantage gained by this construction is that direct pressure is applied to
the bottom packing through rigid metallic parts instead of heretofore through the
upper packing material. In the latter case the upper packing material must be
subjected to such pressure as not only suffices to make a tight joint at the top but
also to compress the packing material at the bottom to the necessary degree.
Dated 20th day of March 1894.
E. T. WHITELOW, A.M. Inst. C.E.,
70, Deansgate, Manchester, Agent for the Applicant.
COMPLETE SPECIFICATION.
Improvements in or applicable to Plug Cocks.
We JAMES ASHTON FLETCHER, SAMUEL FLETCHER, and JACKSON
FLETCHER, all of Borough Brass Works, Ashton-under-Lyne, in the County of
Lancaster, Brass Founders, 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 :-
Our said invention relates to an improved construction of plug cocks for fluids
under pressure.

page_text: In order that our said invention may be more clearly understood we will describe
the same with reference to the accompanying drawings in which
Figures 1 and 2 are respectively a longitudinal section and plan of a single gland
plug cock.
Figures 3 and 4 are like views of a double gland plug cock.
Figure 5 is a cross section of the plug and its seating.
In a plug cock made in accordance with our said invention we use a cylindrical
plug a provided with the usual ways or passages and which rests at the bottom on
an annulus of packing material & supported by a stool or block clying loosely in
the casing d of the cock. The bottom a' of the plug is solid in order that the fluid
may exercise pressure thereon in such a way as to counteract the fluid pressure on
the upper part of the plug. Any tendency of the plug to rise by the action of
fluid pressure is thus eliminated and the function of the packing at the top of the
casing is merely to prevent the escape of the fluid.
At the upper part the plug is provided with a shoulder a² against which bears
the projecting inner rim of a metal gland e connected to the casing by bolts or
screws.
For the purpose of packing the plug at the top a recess or stuffing box d¹ is
formed in the casing about the upper end of the plug to contain the packing
material. Resting on the packing material is a ring h the upper face of which
takes against the under flat face of the metal gland e.
For packing the plug at the sides the usual packing material in slots g parallel
to the plug is used and the herein before mentioned ring under the gland e
presses thereon.
By tightening the bolts of the gland e the projecting rim thereof forces the plug
against and compresses the bottom packing while the under face of the gland e
bears on the ring h lying over the packing in the stuffing box at the top of the plug
and compresses the latter.
The advantage gained by this construction is that direct pressure is applied to
the bottom packing through rigid metallic parts instead of as heretofore through
the upper packing material. In the latter case the upper packing material must
be subjected to such pressure as not only suffices to make a tight joint at the top
but also to compress the packing material at the bottom to the necessary degree.
In a double gland cock the shank of the plug a is packed in the glande by a
metallic packing ring k resting on a shoulder of the shank and held down bv B
second or accessory gland 7 taking into the gland e as will be well understood from
an inspection of Figure 3 of the accompanying drawing.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed we declare that what
we claim is. -
1. A plug cock having a cylindrical balanced plug with side and top and bottom
packings constructed and arranged substantially as hereinbefore described and
shown in the accompanying drawings.
the
2. In a plug cock the shouldered solid bottomed plug a the lower packing
upper packing the ring and the glande combined and arranged substantially as
and for the purpose herein before described and shown.
3. In a plug cock the combination of a lower packing a plug and a gland bearing
direct on the plug for directly compressing the lower packing substantially as [set
forth and shown.
Dated 14th day of December 1894.
E. T. WHITELOW, A.M. Inst. C.E.,
70, Deansgate, Manchester, Agent for the Applicants.