Improvements in Metallic Packing for Engine Stuffing Boxes and the like.
Year: 1895

page_text: PROVISIONAL SPECIFICATION.
Improvements in Metallic Packing for Engine Stuffing Boxes and
the like.
I, CHARLES PETER JOHNSON of 57 Walpole Street, South Shields in the
County of Durham, Engineer, do hereby declare the nature of this invention to be
as follows:-
This invention relates to metallic packing for engine stuffing boxes and the like.
I use for the packing any suitable metallic material or alloy and apply same to
the rod preferably in two rings each consisting of three or more segments.
According to my invention in arranging the packing in the box I groove or
form the circumferential abutting faces of the adjoining segments in such manner
that when placed in position a small space intervenes circumferentially between
them at the joint and around the said space is formed a groove of suitable depth
into which fits a corresponding projection formed on the inner side of a segmental
ring or cylinder of brass or similar material adjustable for wear which embraces
the packing pieces; in a peripheral recess upon the outer side of same a spiral or
other suitable spring is arranged which exerts a radial pressure thus compressing
all the parts.
The packing and its embracing ring or cylinder aforesaid are contained in a
cylindrical casing constructed in two parts connected together by interlocking
projections thereon the joints between the ends thereof and the packing being
diagonally or otherwise disposed so as to give steam tightness while allowing of
sufficient lateral play for the rod. This construction of casing ensures the proper
maintenance of the parts in position when the gland is slacked back.
In addition to the above contiguous to the neck bush of the box and a true fit
around the rod I may place a ring for preventing the ingress of grit or dirt from
the cylinder and intervening between this ring and the adjoining end of the casing
I arrange a series of coiled springs for exerting an axial pressure on the parts for
securing the whole when the gland is screwed up.
Between the other end of the casing abutting against it by a faced joint and the
gland interpose a ring preferably provided with external and internal packings
of asbestos or the like which serves to prevent leakage and retain the lubricant for
the rod.
The casing and inner ring referred to are of somewhat less diameter than the
stuffing box but the outer ring is made a true fit therein thus allowing of the free
lateral movement of the casing and ring near the neck bush with the rod and
preventing damage to the packing while for facilitating the fitting of the various
parts around the rod they may be formed in sections and suitably fastened
ogether.
Dated thi th .
T 1
1007
A. CRAWHALL CHAPMAN,
3 St. Nicholas Buildings, Newcastle-on-Tyne, Patent Agent.

page_text: COMPLETE SPECIFICATION.
Improvements in Metallic Packing for Engine Stuffing Boxes and!
the like.
I, CHARLES PETER JOHNSON of 57 Walpole Street, South Shields in the
County of Durham, Engineer, 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 improvements in metallic packing for engine stuffing
boxes and the like and I will proceed to fully describe it with reference to the
accompanying drawings in which Figure 1 shows an half longitudinal elevation
and an half longitudinal sectional view taken in part on a joint, Figure 2 being a
transverse sectional view; Figure 3 is a similar view to Figure 1 of a development,
Figure 4 being an end view of the ring 17 and in the following description like
marks of reference indicate like parts.
Referring to the drawings (Figures 1 and 2) 3 are anti-friction metal packing
rings adjoining the piston rod 4. These rings are preferably made in segments.
and half-lap jointed as shown so as to provide for wear. Their inner butt faces
are grooved as shown to receive the corresponding projection 5 formed on the inner
side of a segmentally formed ring or cylinder 6 of brass or equivalent material the
joints of which are also formed so as to provide for wear as shown and in a
peripheral recess on the outer side of same a spiral or other suitable spring 7 is
arranged which exerts a radial pressure thus compressing all the parts.
The packing and its embracing ring or cylinder aforesaid are contained in
a cylindrical casing constructed in two main parts and 9 each of such parts being
formed in halves as shown and by means of the screws 10 they can be fastened
together.
The separate parts of the casing are formed as shown with interlocking
projections 11 to assist in holding the parts together when the gland is slacked
back and internal diagonally arranged faces designed to abut against the
corresponding faces of the packing 3.
I prefer by way of strengthening and for keeping the packing steam-tight to
incorporate therein a brass or Muntz metal liner 12.
13 is a neck bush and 14 a reducing ring for preventing grit or dirt from passing
from the cylinder and although it need not be packed it is a steam-tight fit around
the piston rod 4. It is made in halves and fastened together by screws 15.
Should steam happen to pass this ring it will be reduced in pressure or wire-drawn
before reaching the box.
Between the reducing ring and the end of the casing 8 and adapted to be fitted
thereto by screws 16 as shown I fit a ring 17 having a suitable number of recesses
(say eight) therein in which I fit coil springs 18 for exerting an axial pressure on
the parts for securing the whole when the gland is screwed up.
In a concavity of the opposite end of the casing 9 I prefer to fit as a face joint an
anti-friction metal or brass convex-backed vibrating ring 19 which will enable the
casing to vibrate more or less against it if the gland is not screwed up quite square
and adjoining the casing end I fit finally the stuffing box packing ring 20 made in
halves and held together by projecting pins 21 on one half protruding into
corresponding recesses on the other half. This ring keeps the stuffing box tight
and also allows the casing to float or vibrate against it. 22 is an anti-friction
metal or lead outside lining to the packing ring 20 and 23 is asbestos packing to
lubricate the rod.
a a are clearance spaces to allow for wear. 24 is a bush and 25 the gland.
The inside anti-friction metal packing rings 3 alone are in contact with the rod

page_text: and their inclined ends are forced inwards against the piston rod when the gland is
screwed up.
To adapt the improved packing to deep stuffing boxes in Figure 3 I show the
cylindrical casing embracing the packings 3 and rings 6 made in three parts the
outer parts 8 and 9 interlocking with a central cone-shaped part 26 the action of
this duplicated arrangement being in all respects similar to that above described
with reference to Figures 1 and 2.
The whole of the parts as above described and as shown in the drawings are
specially designed to provide for wear without thereby in any way damaging the
packing.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
1. The combination of packing rings 3 rings 6 spring 7 and interlocking
casings 8 and 9 all arranged disposed and adapted to work with regard to the
remaining parts substantially as and for the purposes herein set forth.
2. In combination with the rings 3 and 6 and spring 7 and interlocking
casings 8 and 9 at one end the spring-holder ring 17 and reducing ring 14 and at
the other end the face jointing ring 19 and packing ring 20 all arranged disposed
or adapted to work substantially as herein set forth.
3. The combination or arrangement of parts substantially as herein set forth
with reference to Figures 1 and 2.
4. The combination or arrangement of parts substantially as herein set forth.
with reference to Figure 3.
5. The general arrangement or combination of parts comprising the improve-
ments in metallic packing for engine stuffing boxes and the like all arranged
disposed and adapted to work substantially as herein set forth.
Dated this 10th day of April 1896.
A. CRAWHALL CHAPMAN,
3 St. Nicholas Buildings, Newcastle-on-Tyne, Patent Agent..