Improvements in Metallic Packings for Piston Rods and the like.
Year: 1897

page_text: Date of Application, 13th May, 1897-Accepted, 19th June, 1897.
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COMPLETE SPECIFICATION.
Improvements in Metallic Packings for Piston Rods and the like.
"
I, REUBEN LOWE BARKER, of Newton Moor, near Hyde, in the County of Chester,
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 :-
My invention relates to improvements in metallic packings for piston rods, and
the like, and my improvements consist in certain novel combinations and arrangements
of the parts composing the packing.-
In the accompanying three sheets of drawings-
Figure 1 is a sectional elevation of the stuffing box or gland of a piston rod
fitted with my improved metallic packing.
Fig. 2 is a sectional detail of one form of the improved packing.
Figs. 3 and 4 are similar views respectively illustrating an alternative form of my
improved packing.
Fig. 5 shows a modified form of the packing illustrated by Figs. 1 and 2, and
Fig. 6 a modified form of the packing illustrated by Figs. 3 and 4.
F
Referring first to Figures 1 and 2, -a designates the stuffing box, 6 the piston
rod, and c the metallic packing illustrated in detail in Fig. 2.
This packing consists of two guide blocks d with two slide blocks e fitted between
them. The internal faces of all the blocks d and e are shaped and finished to fit
the piston rod b. The two guide blocks d are coupled and drawn together by
two springs each of which is placed in a flanged tube or sleeve which passes
through a hole in one of the slide blocks e, and the tension of each spring fis
adjusted by means of a screwed stud which screws into an internally threaded
cap i, the spring being compressed between the head of the stud h and the bottom
of the tube or sleeve g.
In like manner the slide blocks e are pressed towards each other by two springs j
each of which is placed in flanged tube or sleeve k which passes through a slot in
the corresponding tube or sleeve 9 and the tension of each spring is adjusted by
means of a screwed stud which screws into an internally threaded flanged tube m
which passes through the corresponding cap i, the spring being compressed between
the head of the stud and the bottom of the sleeve or tube k.
In the alternative construction illustrated by Figs. 3 and 4, I dispense with the
arrangement of springs and yokes or cross pieces and instead I form radial
recesses in both the guide blocks d and slide blocks e, and in these recesses I fit
internally flanged tubes n containing springs which I compress by means of a
circumferential or belt spring p encircling the blocks d and e and pressing their
internal faces towards the piston rod b so that the whole forms a close joint.
The modified construction of packing shown in Fig. 5 is substantially the same
as that described with reference to Figs. 1 and 2 with this difference, that the
packing is divided into six parts instead of four which necessitates a re-arrangement
of the springs and frame by which the blocks are held together. These two additional
blocks are fitted in recesses in the guide blocks d and project into slots in the
slide blocks e so as to break joint with the two sets of blocks d and e and key or hold
them together and the parts d and e are fitted together with a tongue and groove to
hold them in the same plane. The key blocks q are pressed against the piston rod b
by springs r compressed in recesses formed in projections d' on the guide blocks d by

page_text: screwed plugs s, and to accommodate this arrangement two springs j in tubes / are
-employed instead of a single spring and tube k as in Fig. 2 and the springs jare
-compressed and adjusted by means of two studs screwing into the projection d'.
In like manner, in the modified construction of packing shown in Fig. 6, the
flanged tubes n and radial springs o are dispensed with and the belt spring p bears
directly on the slide blocks e and the shanks of the key blocks q.
The method of maintaining the guide blocks and slide blocks in the same plane
by means of tongue and groove joints is preferably applied to this construction
and also to both the constructions illustrated by Figs. 2 and 4.
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. The several combinations and arrangements of parts embodying my improve-
ments in metallic packings for piston rods and the like, substantially as herein
described with reference to the accompanying drawings.
2. The combination with the guide blocks d and slide blocks e, of the frame consisting
of the yokes or cross pieces and adjustable springs substantially as herein described
with reference to Figs. 1 and 2.
3. The combination with the guide blocks d and slide blocks e, of the tubes n,
radial springs o and belt spring p substantially as herein described with reference to
Figs. 3 and 4.
4. The arrangement use and application of the key blocks a substantially as
described with reference to Figs. 5 and 6.
':
5. In a metallic packing of the indicated nature, fitting the guide blocks and
the slide blocks together with tongue and groove joints to hold the parts composing
-the packing in the same plane substantially as herein set forth.
Dated this 11th day of May 1897.
H. B. BARLOW & GILLETT,
17 St. Ann's Square, Manchester, Agents for Applicant.