Improvements in and relating to Apparatus for Facing Inside Cylinder Valve or Port Faces.
Year: 1894

page_text: Date of Application, 10th Aug., 1894
Complete Specification Left, 13th Feb., 1895-Accepted, 23rd Mar., 1895
PROVISIONAL SPECIFICATION.
Improvements in and relating to Apparatus for Facing Inside
Cylinder Valve or Port Faces.
I AUGUSTUS LLOYD DAVIESS 20 Montague Street, Doncaster in the County
of York, Engineer, do hereby declare the nature of this invention to he as
follows:-
This invention provides for the simultaneous facing up of both inside cylinder
ports, at one operation by means of two steel or cast steel file-cut surface plates,
between which goes a short collared spring screw bolt, fitting against, or into the
surface plates with elastic pressure which can be tightened or slackened at pleasure.
On this short stud or bolt, fits easily on (and can as easily be slipped off) a small
connecting rod by which the necessary reciprocal motion is given, by means of a
crank, lever, or wheel.
These file-cut surface plates are prevented from buckling or warping during the
process of hardening and tempering by double nuts on the rods passed through the
centre holes, several plates being clamped together by the edges as well for this
purpose, if desired or requisite, though yet at a necessary distance apart from each
other.
These surface plates whether each be file-cut on one side only or on both sides,
so as to be economical and reversible, though the length of the valve need not be
anything like so broad, even two-thirds the breadth would do, as all that is
compensated for by the length of the stroke. They need not be very thick, say
from "upwards, anything other than to prevent warping, and allow for recutting &c.
They must be file-cut in the direction of the stroke; the file dust falls into the
ports, to be afterwards removed, but leaves the file-cut surface plates clear and
free to work smoothly and elastically, yet rigid, with any amount of pressure
requisite. The short screwed, collared and nutted spring stud or bolt between, can
be tightened or otherwise at any time slackened to examine the progress made. It
takes the least possible amount of material off the port faces; if one side be finished
before another as occasionally but very rarely might happen, then put a plain
smooth well greased surface plate in its place until the other side be also done.
The ports on both sides should be finished in an hour, and need not the touch of a
scraper or other tool to be fit for the valves. Eight or nine inches, a little more or
less should be broad enough for these file-cut surface plates but that as engineers
think fit.
There is no giving or bending in these plates by any pressure against the ports.
The ports also are filed always square with each other.
Dated the 8th day of August 1894.

page_text: Improvements in and relating to Apparatus for Facing Inside
Cylinder Valve or Port Faces.
1, AUGUSTUS LLOYD DAVIESS 20 Montague Street, Doncaster in the County
of York, Engineer, do hereby declare the nature of this invention and in what
manner the same has to be performed, to be particularly described and ascertained
in and by the following statement :-
My invention relates to the method of and apparatus for "facing up" both the
inside cylinder ports of locomotive and other similarly constructed engines
simultaneously.
The apparatus is illustrated in the annexed sheet of drawings, similar letters of
reference indicating similar parts in any of the figures.
Fig. 1, side elevation of the interior of steam chest with facing tool in working
position.
Fig. 2, plan of same in section.
Fig. 3, enlarged side view of the end of rod which imparts the reciprocating
motion.
Fig. 4, sectional plan of same through centre.
Fig. 5, side and edge of facing tool.
In carrying out my invention I prepare the facing tools shown in Fig. 5. which
are made perfectly true, and are toothed or filecut on one or both sides in the
manner found most suitable for the operation, and are hardened and tempered in the
usual way except that I prefer to bolt a number of such filecat plates together,
either through a centre hole or holes made for the purpose, with a distance piece
placed between each plate, and the edges being held rigidly in cramps so as to
prevent the plates warping, but this method is not essential.
These filecut plates A, have a prepared centre hole H, and when required for
work they are placed upon the opposite ends of a small crosshead shown in Fig. 4,
with the filecut faces outwards, and so that they fit between and are pressed against
the opposite faces of ports P, in the position shown in Figs. 1 and 2.
The crosshead consists of a bolt and nut of special construction, arranged to
constitute a central neck and two side projections or axes D2, and B².
The bolt or screw B, has a hexagon collar B', and a projection B2, and the nut D,
has a similar hexagon collar D' and projection D2, to fit the centre holes of the
plates. Upon these projections or axes I place either an elastic washer such as C,
or I may use short coiled springs, or spring washers, and upon the still projecting
ends I place the filecut plates as indicated in Fig. 4.
The central part of the nut D, is reduced in diameter to form a neck, upon which
the
open end slot F, of the forked end of the connecting rod G, rests when in
working position.
The rod G, can thus be readily raised and removed when it is desired to examine
the progress of the work.
It will be seen that by the above arrangement the surfacing tools can be adjusted
laterally by means of the screw B, and will be forced against the port faces
with an elastic pressure; the adjustment may be made with a spanner, or by a
short lever or "tommy" inserted into holes E, provided for that purpose if more
convenient, and thus a light or heavy cut can be obtained.
The plates may be filecut upon both sides and thus would be reversible, but on
the other hand one side may be left perfectly smooth in order that if only one of
the port faces requires refacing, or if one port face from some reason or other is
finished before the other, then the plate can be reversed and being well greased
will work without abrasion against the finished face until the other is finished.

page_text: The filings or metal dust will fall into the ports and can be removed from time
to time.
The connecting rod G, may be connected with any arrangement of mechanism
for giving the necessary reciprocating motion to the crosshead and plates, either by
hand lever, or otherwise.
The process of abrasion is gradual and even, and no afterwork is required, as
these tools leave the work in a perfectly finished condition, and with the smallest
amount of reduction of the faces.
No special width of filecut plate is necessary as variation in the width can be
compensated for by altering the length of the reciprocating movement.
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:
1. An apparatus for facing the inside cylinder ports of locomotive engines,
consisting of two facing plates A, filecut or toothed upon one or both flat sides,
and fitting upon the ends of a bolt or stud B, provided with rubber or other
equivalent springs C, arranged to act upon and force the facing tools or plates A,
apart, and against the port faces, and operated by a connecting rod G, driven by
any suitable power, substantially as herein before described, and shown in the
drawings.
2: The method of facing up the faces of the inside cylinder ports of engines by
filecut or toothed surface plates, pressed outwards automatically and having a
reciprocating motion imparted to them by any suitable means substantially as
hereinbefore described and shown.
Dated the 19th day of January 1895
ROBT. F. DRURY, C.P.A.,
Bank Buildings, George Street, Sheffield, Agent for Applicant.