Improvements in Stuffing Boxes.
Year: 1896

page_text: Date of Application, 11th Dec., 1896
Complete Specification Left, 27th Aug., 1897-Accepted, 30th Oct., 1897
PROVISIONAL SPECIFICATION.
Improvements in Stuffing Boxes.
We, JOHN ISAAC THORNYCROFT F.R.S. of Chiswick Mall, Chiswick, in the
County of Middlesex, and THE STEAM CARRIAGE AND WAGON CO. LIMITED, of
Homefield, Chiswick, aforesaid, Auto-car Builders, do hereby declare the nature of
this invention to be as follows:-
This invention has reference to a construction of stuffing boxes dispensing with
ordinary glands and in which suitable packing material preferably white metal
shavings is used. Such a stuffing box is or may be made with its cover integral
with the rest of the box and bored to fit the rod or part to be packed but so as to
allow such part to work through the hole in the cover and for the introduction of
the packing material. The box is constructed with necks or tubular projections
which are or may be arranged with their axes in directions tangential to the
periphery of the rod or part to be packed, these necks or tubular projections being
externally screw threaded at their outer ends and fitted with blocks whose inner
ends project into the stuffing box and which blocks are secured in place and can be
forced to a greater or lesser extent into the stuffing box by means of cap-nuts. In
lieu of white metal shavings other suitable packing material such for example as
Delaunay Belleville Patent Shot Packing may be employed.
As will be evident with the construction of stuffing box described the packing
material may be pressed more or less tightly according to the extent to which
by the screwing up of the cap-nuts the blocks are forced into the interior of the
box.
Improvements in Stuffing Boxes.
We, JOHN ISAAC THORNYCROFT, F.R.S., of Chiswick Mall, Chiswick, in the
County of Middlesex, and THE STEAM CARRIAGE AND WAGON CO. LIMITED, of
Homefield, Chiswick, aforesaid, Auto-car Builders, 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 has reference to a construction of stuffing boxes dispensing with
ordinary glands and in which suitable packing material, preferring white metal
shavings, is used. Such a stuffing box is or may be made with its cover integral
with the rest of the box and bored to fit the rod or part to be packed but so as to
allow such part to work through the hole in the cover; and, for the introduction
[Pin 1

page_text: of the packing material, into the packing chamber the box is constructed with
necks or tubular projections which are or may be arranged with their axes in
directions tangential to the periphery of the rod or part to be packed, these necks
or tubular projections being externally screw threaded at their outer ends and
fitted with blocks whose inner ends project into the stuffing box and which blocks
are secured in place and can he forced to a greater or lesser extent into the stuffing
box by means of cap-nuts. In lieu of white metal shavings other suitable packing
material, such, for example, as Delaunay Belleville Patent Shot Packing, may be
employed.
As will be evident with the construction of stuffing box described the packing
material may be pressed more or less tightly according to the extent to which by
the screwing up of the cap-nuts the blocks are forced into the interior of the box.
Referring to the accompanying illustrative drawings,
Figs. 1 and 2 show vertical sections at right angles to each other of a stuffing
box according to this invention.
In this example the following parts are integral (that is to say) the lateral wall 1,
the inner end 1 an external screw threaded neck 1b adapted to be screwed into the
end C of a cylinder, the outer end 1 (which corresponds to the cover in an ordinary
stuffing box) and the necks 3.
2 is the chamber or space to contain packing material. The inner end and
neck 11b and the cover part 1 of the wall of the box are bored to fit the rod to
be packed. The necks 3, are externally screw threaded and have their axes
tangential to the periphery of the rod. 4, 4 are blocks (one of which is shewn
separately in Figs. 3 and 4) that fit into the tangential necks 3, and project into
the stuffing box, or in other words into the chamber which contains the packing
that surrounds the rod or part packed. 5, 5 are cap-nuts that hold the blocks 4
in place and by means of which they can be forced to a greater or less extent into
the stuffing box so as to press the packing therein against the rod.
The packing we prefer to employ in stuffing boxes of the kind described is that
known commercially as Wheeler's Fibrous Metallic packing. This packing
contains white metal shavings and fine graphite. The graphite tends to prevent
the white metal shavings flowing into a solid mass that would be difficult to remove
from the stuffing box.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed we declare that what
we claim is:-
1. A stuffing box the inner and outer ends or walls of which are bored to fit the
rod or part intended to be packed with material placed in the packing
chamber of the box and constructed with necks or tubular projections
communicating with the said chamber which necks are fitted with
blocks adapted to be secured in place and to be forced to a greater
or less extent into the stuffing box by means such as cap nuts, substantially
as hereinbefore described and shown in the accompanying drawings.
2. A stuffing box constructed with a lateral opening or lateral openings whose
direction is tangential to the rod to be packed the same being provided with closing
means substantially as described.
Dated this 27th day of August 1897
W. LLOYD WISE,
46 Lincoln's Inn Fields, London, W.C., Chartered Patent Agent.