Improvements in Stuffing-boxes for Expansion and other Steam Engines, and for other like purposes.
Year: 1889

page_text: Date of Application, 2nd Dec., 1889
Complete Specification Left, 20th Aug., 1890-Accepted, 18th Oct., 1890.
PROVISIONAL SPECIFICATION.
Improvements in Stuffing-boxes for Expansion and other Steam
Engines, and for other like purposes.
We TANGYES LIMITED of Cornwall Works Soho in the County of Stafford Engineers
and THOMAS EKINS DAINTREE of Villa Road Handsworth in the County of Stafford
Mechanical Engineer do hereby declare the nature of this invention to be as
follows:-
1
The said invention consists of the improvements herein after described in stuffing
boxes. The said improvements are especially applicable to the stuffing boxes of
expansive steam engines where there is not sufficient distance between the cylinders
for the convenient application of stuffing boxes of the ordinary kind; the said
improvements are however also applicable to steam hammers and other
where
purposes
for any reason it is desirable to effect the compression of the packing material
laterally that is in a direction at right angles to the piston rod.
In constructing a stuffing box according to the said invention we employ two
pressing or gland plugs situated in a line with one another on opposite sides of and
at right angles to the piston rod. The said plugs pass through openings in the case
of the gland their inner ends bearing against the packing material at opposite sides
of the piston rod. The outer ends of these plugs abut against cross bars connected
by screw bolts and nuts. By tightening the screw nuts on the screw bolts the gland
plugs can be made to press upon the packing material with any required degree of
tightness. In consequence of the connection described between the gland plugs the
tightening effected by the screw nuts and bolts produces precisely the same pressure
in opposite directions on the said gland plugs.
As the said cross bars screw bolts screw nuts and gland plugs can move as a whole
any carelessness in the arrangement of the packing material is compensated, the
pressure on the opposite sides of the piston rod being preserved uniform however
irregularly the packing material may have been arranged. There is thus effected
under all circumstances a graduated pressure on the packing at opposite sides of the
piston rod, the equality of which is not disturbed by the careless arrangement of the
packing material. The piston rod consequently cannot be unduly pressed on one
side under any circumstances.
D
11- C
11000
W. T. WHITEMAN,
Agent for the Applicants.
COMPLETE SPECIFICATION.
Improvements in Stuffing-boxes for Expansion and other Steam
Engines, and for other like purposes.
We TANGYES LIMITED of Cornwall Works, Soho in the County of Stafford Engineers
and THOMAS EKINS. DAINTREE of Villa Road, Handsworth in the County of Stafford
Mechanical Engineer do hereby declare the nature of the said invention and the
manner in which the same is to be performed to be particularly described and
ascertained in and by the following statement :-
The said invention consists of the improvements hereinafter described in stuffing
boxes. The said improvements are especially applicable to the 'stuffing boxes of
expansive steam engines where there is not sufficient distance between the cylinders
for the convenient application of stuffing boxes of the ordinary kind, the said
improvements are however also applicable to steam hammers and other purposes
01

page_text: where for any reason it is desirable to effect the compression of the packing material
laterally that is in a direction at right angles to the piston rod.
In constructing a stuffing box according to the said invention we employ two
pressing or gland plugs situated in a line with one another on opposite sides of and at
right angles to the piston rod. The said plugs pass through openings in the case of
the gland their inner ends bearing against the packing material at opposite sides of
the piston rod. The outer ends of these plugs abut against cross bars connected
by screw bolts and nuts. By tightening the screw nuts on the screw bolts the gland
plugs can be made to press upon the packing material with any required degree of
tightness. In consequence of the connection described between the gland plugs the
tightening effected by the screw nuts and bolts produces precisely the same pressure
in opposite directions on the said gland plugs.
Figure 1 of the accompanying drawing represents in elevation partly in vertical
section through the two cylinders a portion of a vertical compound expansive steam
engine to which a stuffing box constructed according to this invention is applied;
Figure 2 represents partly in elevation and partly in vertical section the high
pressure cylinder of the said compound engine, the sectional part of Figure 2 being
taken in a plane at right angles to that in which the sectional part of Figure 1 is
taken and
Figure 3 represents a horizontal section of the said high pressure cylinder and the
stuffing box and appliances connected with it.
The same letters of reference indicate the same parts in Figures 1, 2 and 3. a is
the smaller or high pressure steam cylinder of the compound engine and is the
larger or low pressure cylinder; c is the piston rod to which the high pressure
piston d and low pressure piston e are affixed in the ordinary way. The bottom of
the smaller or high pressure cylinder a is formed into the stuffing box casing the
form of which is best seen in the horizontal section Figure 3. The said stuffing box
casing is represented as cast in one piece with the top cover g of the low pressure
cylinder 6 but the said casing and top cover g may be made of separate parts. In
the stuffing box casing we place the sleeve or bush h through which the piston
rod c passes the said piston rod fitting closely in the top and bottom collars only of
the said sleeve or bush h. The part of the sleeve or bush between the upper and
lower collars is recessed and forms a small chamber (see Figure 3) in which the
packing material of the stuffing box is placed, the said chamber i being situated
opposite the bond holes d, d in the casing. The sleeve is fixed in the casing of
the top cylinder by the set screws k, k passing through the said casing and taking
into the sleeve (see Figure 3). For the purpose of holding the packing material in
its place and for putting any required uniform pressure on the said packing material
on opposite sides of the piston rod, we use the pressing or gland plugs 1, situated
in a line with one another and on opposite sides of and at right angles to the piston
rod c and also situated opposite the recess or chamber in the gland sleeve h. The
gland plugs work freely in the bond holes d, d in the gland casing the inner
ends of the said plugs bearing against the packing material in the sleeve h at opposite
sides of the piston rod and their outer ends carrying cross bars or heads m, m which
are connected together by long through bolts n and screw nuts p as seen in Figure 3.
The screw bolts and nuts n, p are accessible from the outside of the cylinder lagging
as represented.
By tightening the screw nuts p, p on the screw bolts n, n the gland plugs 1, 1 can
be made to press upon the packing material in the chamber i of the sleeve h with
any degree of tightness and by the arrangement of parts represented the same
pressure is produced in opposite directions on the gland plugs. In order to unpack
the sleeve of the stuffing box for the adjustment or renewal of the packing material
therein surrounding the piston 1od c, the pressure plugs are withdrawn and the
packing material readjusted or renewed when the plugs are replaced in the bond
holes d d of the casing f and drawn together by the bolts and nuts np and cross
bars or heads m m as before described. As the said cross bars or heads screw bolts

page_text: and nuts and gland plugs can move as a whole any carelessness in the arrangement
of the packing material is compensated, the pressure on opposite sides of the piston
rod being preserved uniform however irregularly the packing material may have
been arranged. There is thus effected under all circumstances a graduated pressure
on the packing at opposite sides of the piston rod the equality of which is not
disturbed by the careless arrangement of the packing material. The piston rod
consequently cannot be unduly pressed on one side under any circumstances.
The cross heads m, m which form the connection between the screw bolts n, n and
the pressure or gland plugs 1, 1 may either consist of rigid bars as represented or
they may be made of steel or other elastic material and be made to act as springs
for putting a continuous pressure on the plugs and packing material.
Although we have only described and represented the said invention as applied to
the stuffing box of an expansive steam engine to which it is particularly applicable
yet the said invention may also be applied to other like purposes where a lateral
compression of the packing material upon the piston rod is required in the machine
or apparatus.
Having now particularly described and ascertained the nature of the said inven-
tion and the manner in which the same is to be performed we declare that we
claim as the said invention of "Improvements in stuffing boxes for expansion and other
steam engines and for other like purposes" :-
First-Constructing a stuffing box essentially of a sleeve or bush filled with the
packing material fitted in a casing carried by the cylinder in combination with
pressing or gland plugs situated in a line with one another and at opposite sides of
and at right angles to the piston rod, whereby a uniform pressure can be applied to
the packing material on opposite sides of the piston rod for the purpose described,
the several parts of the stuffing box being constructed and arranged and acting
substantially as herein before described and illustrated in the accompanying
drawing.
Secondly: The combination with a stuffing box of the kind referred to in the
prior claim of the arrangement of parts described and illustrated for producing
precisely the same pressure in opposite directions on opposite sides of the gland plugs
and thereby producing a uniform pressure on opposite sides of the packing material
surrounding the piston rod substantially as described and illustrated.
Dated the 18th day of A nonst 1200
TANGYES LIMITED,
W. J. Parkins, Secretary.
THOMAS EKINS
DAINTREE.