An Improved Cut-off Valvular Device for Steam and other Engines.
Year: 1895

page_text: Date of Application, 14th Mar., 1895
Complete Specification Left, 5th July, 1895-Accepted, 19th Oct., 1895
PROVISIONAL SPECIFICATION.
An Improved Cut-off Valvular Device for Steam and other Engines.
I, Moses EDWARD TEAGUE Steam Mills, Cinderford, Gloucestershire
Mechanical Engineer, do hereby declare the nature of this invention to be as
follows:-
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In the Specification of my Patent No. 22,484, of the year 1893, I have
described and claimed an improved balance valve for steam and other uses.
I have also in said Specification described a method and means whereby said
improved balance valve might be utilized as an admission, or cut off, valve.
Now, it is in connection with this particular user that my present invention
has reference; my present improvements being devised with a view to ensure an
automatic cut-off. In order to arrive at this result I employ, in conjunction with
the device described in the Specification of my previous Patent above identified
and for the purpose of regulating or controlling the cut-off, an ordinary Watt
governor or such like, the function of which in this application, is to vary the
length of the valve spindle by means of a right and left handed screw, or by means
of levers, and thus the lap of the valve becomes altered automatically. That is to
say: I now propose to dispense with the necessity of altering the angular advance
of the cut-off eccentric, by using a mechanical device to give a certain amount of
slip" in each stroke of the spindle of my improved valve-already patented as
above and which will have the effect of lessening the premature admission of
steam (when steam is used) to the engine cylinder, and thus give a further automatic
range than the lap of the engine slide valve would otherwise allow.
.6
Dated this Seventh day of March 1895.
V. LAZARUS,
1 Furnival Street, Holborn, E.C., Agent for Applicant.
1, MOSES EDWARD TEAGUE Steam Mills, Cinderford, Gloucestershire
Mechanical 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 :-
In the Specification of my Patent No. 22,484 of the year 1893 I have described
and claimed an improved balance valve for steam and other uses. I have also in
said Specification described a method and means whereby said improved balance
valve might be utilised as an admission, or cut off, valve. Now, in accordance
with my present improvements propose to dispense with the necessity of altering
the angular advance of the cut-off eccentric, by using a mechanical device to give
a certain amount of "slip" in each stroke of my improved valve referred to above,
and which will have the effect of lessening the premature admission of steam
(when steam is used) to the engine cylinder and thus give a further automatic
range than the lap of the engine slide valve would, otherwise, allow. In order to
arrive at this result of an automatic cut-off, I employ in conjunction with the device
described in the Specification of my previous Patent above identified and for the

page_text: purpose of regulating or controlling the cut-off, an ordinary "Watt" governor or
other type of governor, the function of which in this application, is by means of
and in connection with a right and left handed screw and accessories hereunder
further referred to ;-to vary the length of the valve spindle and consequently, to
alter, automatically, the lap of the valve.
In order that my invention may the better be understood I have appended the
accompanying sheet of drawings illustrative thereof. Figure 1 being a longitudinal
sectional elevation of the device complete; and, Figure 2 a cross section taken on
line 1. 2, Figure 1.
The right and left handed screws a aforesaid work in the female screw-threaded
sleeve b. A bracket or arm c is attached at one end as shewn Figure 1, to the
spindle p of the balance valve, the other end of said bracket piece or arm is
enlarged and formed so as to allow of its working to and fro' as a slide, in suitable
guides formed in the valve cover and without allowing the screw a to twist round.
The bossed end d' of the lever arm d encircles loosely the sleeve b, the outer end
of the lever arm d being connected up to the governor. A key or feather e is
fitted and secured in the bossed part d¹ of the lever arm d, a corresponding slot or
keyway being formed in and along the sleeve b. This latter will thus be caused to
reciprocate backwards and forwards accordingly as the lever arm d is raised, or
lowered, as the case may be, by the controlling action of the governor, and so
consequently, to shorten, or to lengthen, the stroke or travel of the valve spindle p.
For instance on the lever d (Figure 2) being raised, the sleeve is slightly turned
and being interiorally screw threaded, turns upon the fixed screws a and forcing
them outwards thereby lengthens the valve rod p secured as herein before stated to
the bracket which latter is also attached to the screw a. When the lever dis
lowered the partial rotation of the sleeve b in the reverse direction draws the two
screws a towards each other, in the recess or space a¹ provided between the ends of
said screws a thereby shortening the valve rod p.
C
I wish it to be understood that although in the drawing, I have, by way of
illustration, shewn an ordinary "Watt" governor; I do not confine myself to the
employment of this particular type of governor; for, in practice, it might frequently
be necessary to adopt a more sensitive governor, of the high speed type.
Also I wish it to be understood, that I might in some cases prefer to fit the
herein before described right and left handed screw device, to the engine eccentric
rod instead of direct on to the valve spindle as shewn.
Referring to the valve itself (Figure 1) fis the valve box with annular chamber g
cored inside for steam to pass round outside of valve cylinder h to outlet i. The
cylinder h has ports or slots k cast in for steam outlets and of suitable area for the
requirements; is the hollow cylindrical valve, made in one piece, through which
the steam passes from the inlet m, to cover n at top. In the middle portion or
"waist" of 1, which is at this part, of reduced diameter, slots o are formed as
shewn (Figure 1) to allow of the steam (in the case where steam is employed)
in order
circulating freely from the interior chamber of valve to the outer space g
to supply the ports k. P is the valve spindle hereinbefore referred to and to the
outer end of which is secured the bracket piece or arm c all as aforesaid.
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:
In steam and other engines, for ensuring an automatic cut-off, the employment of
a "Watt
or other governor in the manner substantially as herein described and
shewn.
V. LAZARUS,
1 Furnival Street, London, E.C., Agent for Applicant.