mprovements in Stuffing-boxes or Piston-rod Packing-boxes.
Year: 1894

page_text: Date of Application, 29th June, 1894-Accepted, 13th Oct., 1894
mprovements in Stuffing-boxes or Piston-rod Packing-boxes.
We, DAVID SPENCER, of Roanoke, in the County of Roanoke, and State of
Virginia, and UNCAS MINECO COUNCILL and NORMAN EDLOW WOODS, of
Richmond, in the County of Henrico, and State of Virginia, all in the United
States of America, Gentlemen, 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 an improvement in stuffing-boxes or piston-rod packing-
boxes, and it has for its object to provide a simple and effective combination of
parts provided with means for adjustment to take up lost motion caused by wear.
Further objects and advantages of this invention will appear in the following
description, and the novel features thereof will be particularly pointed out in the
appended claims.
In the drawing:
Fig. 1 is a side view of a stuffing-box embodying this invention.
Fig. 2 is a front view of the same.
Fig. 3 is a vertical section on the line 3-3 of Fig. 2.
Fig. 4 is a sectional view upon the line 4-1 of Fig. 1.
Similar numerals of reference indicate corresponding parts in all the figures of
the drawing.
1 designates a gland or casing provided with the usual securing-bolts 2, an 1
having a central bore 3 for the reception of the piston-rod or shaft 4 said bore
being enlarged to form a shoulder 5. 6; 6, represent packing-rings, which are
fitted in the enlargement of the bore of the gland or casing close to the shoulder 5,
and they are split on an incline whereby their overlapping terminals are bevelled,
as clearly shown in Fig. 3. Around the packing rings is arranged a clamping
device comprising the approximately semi-circular jaws 7, provided with radially-
disposed stems 8, which extend into radial perforations 9 which are formed in the
sides of the gland or casing. Said perforations are threaded to receive the
exteriorly-threaded guide-tubes 10, provided with heads 11, and enclosing
the tension springs 12. The outer ends of the tension springs bear against the
heads 11, and their inner ends against shoulders 13 at the junction of the stems 8
with the yokes 7. The guide-tubes are adjustable to vary the tension of the
springs and hence the clamping action upon the packing rings.
14 represents a spanner bushing which is threaded into the outer end of the
bore of the gland or casing and bears at its inner end upon the jaws 7 and
packing-rings 6, being provided at its inner end with an inwardly-extending rim or
flange 15 to bear upon the packing rings. The bore formed by the inner edge of
the rim or flange 15 is equal to the inner portion of the bore of the gland, and
hence fits the piston-rod snugly, and the enlarged portion of the bore of the
bushing forms an oil chamber 16 which communicates, by means of radially-
disposed oil ducts 17, with the annular surface channel 18, which is fed with oil
by means of an ordinary oil cup (not shown) said perforations and channel being
closed and covered by the walls of the gland or casing when the bushing is in
place.
It will be seen that the annular bushing 14 maintains the packing-rings and
clamping devices firmly in position and at the same time provides a means for
gaining access thereto for purposes of cleaning, repairing, etc.

page_text: Various changes in the form, proportion and the minor details of construction
may be resorted to without departing from the principle or sacrificing any of the
advantages of this invention.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed we declare that what
we claim is :-
0
1. The combination with a gland or casing, of compressible packing-rings,
curved jaws engaging opposite sides of the packing-rings, adjustable guide-tubes
passed from the outside through threaded perforations in the walls of the gland or
casing and accessible from the outside thereof, and tension springs coiled within
said guide-tubes and bearing at their inner ends against the jaws, substantially as
specified.
2. The combination with a gland or casing, packing rings and a clamping
device therefor, of a hollow bushing threaded into the outer end of the bore of the
gland or casing and provided with an oil chamber, an exterior channel and radial
perforations connecting said oil chamber and channel, the perforations and channel
being closed and covered by the walls of the gland or casing when the bushing is
in place, substantially as specified.
3. The combination with a gland or casing, of compressible packing-rings,
approximately semi-circular jaws arranged in contact with the outer surfaces of
said rings and provided with radially-disposed stems adjustable guide-tubes
threaded in perforations in the walls of the gland or casing, and tension springs
arranged within the guide-tubes and embracing said stems, substantially as
specified.
4. The combination with a gland or casing, of packing-rings arranged therein, a
clamping device arranged in operative relation with said rings, and an annular
bushing threaded into the outer end of the bore of the gland or casing and
provided with an inwardly-extending rim or flange to engage said clamping device
and packing-rings and having an inner oil chamber communicating by radial
perforations with an exterior oil channel, substantially as specified.
Dated this 29th day of June 1894.
W. P. THOMPSON & BOULT,
Agents for the Applicant.