Improvements in Packing Piston Rods and other Moving Parts.
Year: 1891

page_text: Date of Application, 16th Mar., 1891
Complete Specification Left, 16th Dec., 1891-Accepted. 23rd Jan. 1892
PROVISIONAL SPECIFICATION.
Improvements in Packing Piston Rods and other Moving Parts.
I, DAVID FITZGERALD DOWNING, of No. 7 The Arsenal, Woolwich, in the
County of Kent, Captain in H.M. Royal Regiment of Artillery, do hereby declare
the nature of this invention to be as follows:-
According to this invention a recess is formed around the rod or other part
communicating with the fluid under pressure. A pulp of asbestos and tallow or
other suitable material is forced into this recess. The pressure acting on the
material forces it into intimate contact with the rod or other part, and so makes a
tight joint.
To prevent dispersion of the pulp where much play exists between the working
parts it may be enclosed partially or entirely in a flexible envelope such as
canvas.
To facilitate the insertion of the pulp, arrangements may be made for temporarily
closing the communications to the pressure.
Dated this 16th day of March 1891.
CARPMAEL & Co.,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Packing Piston Rods and other Moving Parts.
I, DAVID FITZGERALD DOWNING, of No. 7 The Arsenal, Woolwich, in the
County of Kent, Captain in H.M. Royal Regiment of Artillery, 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 :-
According to this invention a recess is formed around the rod or other part
communicating with the fluid under pressure. A pulp of asbestos and tallow or
other suitable material is forced into this recess. The pressure acting on the
material forces it into intimate contact with the rod or other part, and so makes a
tight joint.
To prevent dispersion of the pulp where much play exists between the working
parts it may be enclosed partially or entirely in a flexible envelope such as
canvas.
To facilitate the insertion of the pulp, arrangements may be made for temporarily
closing the communications to the pressure.
DESCRIPTION OF THE DRAWINGS.
Figure 1 is a section of a spring pressure gauge constructed according to this
invention. A is a pipe leading to the fluid whose pressure is to be measured. B is
a plunger whose stem C is connected to the spring and indicator in the usual way.
Around the plunger is a groove or recess D to be filled with a pulp of asbestos
and tallow or other suitable material. E is a passage leading from the pressure
pipe A to the recess D.
Figure 2 is a longitudinal section and Figure 3 is a transverse section (on the
line A B. Figure 2) of a gland constructed according to this invention. In these
Figures F is the rod passing through the gland and G is a recess around it. His
an annular channel connected by holes to the fluid under pressure, on the under
side of the gland, so that the whole of the underside of the pulp is exposed to the
pressure of the fluid and is thus forced into intimate contact with the rod.
Price 6d1

page_text: Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, 1 would state that I am
aware it has before been proposed to pack piston rods and other moving parts with
a pulpy material acted upon by fluid pressure and so forecd into intimate contact
with the rod or other part and I therefore do not claim this generally, but what I
claim is: :-
1. In packing piston rods and other moving parts the combination of a recess
formed around the rod or other part suitable for being filled with plastic material
and a passage leading to the space containing the fluid under pressure against
which the joint is to be made.
2. Packing for piston rods and other moving parts substantially as described and
shown in the drawings.
Dated this 16th day of December 1891.
CARPMAEL & Co.,
Agents for the Applicant.