Year: 1889

page_text: We EUSTACE WIGZELL, and JOSEPH POLLIT, Engineers, of Bank Foundry, Sowerby
Bridge, in the County of York, 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 :-
Our improvement consists in a trip motion for working a circular or partly circular,
or Corliss Valve, by means of two discs working face to face, one disc working on a
shaft and the other disc working on a square of a shaft.-Between the centre of these
discs there is a bushed ring with a wedge shaped steel projection.-A steel projecting
piece is also made inside the disc that works on the squaro of the shaft.
Attached to the bushed ring there is a lever, fixed in a suitable position on the bushed
ring where the governor connects, and as the loose disc is worked by the eccentric,
the steel cone piece which is inside the disc working on the square, pushes clear the
sliding disc from the two steel projections, and the valve which is worked by a lever,
returns to its normal position by means of a spring or a dash-pot.
When the steel projection inside the disc is clear of the projection on the bushed
ring, the two steel projections on the face of the discs come in contact and lift or open
the valve, until the ring throws them out by its wedge shaped steel projection, and
the valve comes back to its normal position again, which is regulated to cut off at
any desired part of the stroke of Engine by the Governor being attached to the
intermediate bushed ring.
To keep the discs against each other we use a spring.
The lever on the bushed ring works through an opening in between the
two discs.
Our drawings annexed hereto will probably enable the improvement to be better
understood.
In figs. 1. and 2. A is the disc working on the shaft C. and B is the disc working
on the square. D. is the bushed ring (shown more clearly in fig. 2) with the wedge
shaped projection E.-this is also shown in section fig. 6.-F. is the steel projection
inside the disc B.-G. figs. 2 & 3. is the lever attached to the bushed ring and regulated
by the Governor.

page_text: As the loose disc A. is worked by the eccentric connected to lever H. (shown in
figs. 1 and 3.) which is keyed on A. the steel cone piece F. which is inside disc B.
releases the disc B.-I. 1. are steel projections fitted on the discs A. and B which
twist the shaft C. through this dise B. but when the ring D. fig. 2 by means of its
steel wedge shaped piece E. pushes off the sliding disc B. it releases
and allows the
shaft C. to fly back by means of the lever K. which is fixed on the shaft C.-This
lever K. is also attached to the valve and is brought back to its normal position by a
dashpot or spring.-M. is the spring which keeps the disc B. against the face of the
disc A. its tension being adjustable by two rings O. screwed on shaft C.
Fig. 3 shows a front view of disc A. and fig. 4 gives a front view of disc B.
showing the square hole N. through which the shaft C works, and also the steel
projection I.
Fig. 5 shows a front view of disc A. bushed, with steel projection I.
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we declare that what
we claim is :-
1. The method of twisting the shaft when the two discs are together by means of
steel projections let in the faces of the discs, so that when the discs are together the
shaft moves but when separated by the wedge on the bushed ring it returns to its
normal position as described.
2. The method of regulating the cut-off by means of a ring working in between or
in the contro of two discs and fitted with a wedge shaped piece for separating the
dises at any desired position, as described.
3. The method of sliding one disc on the square of a shaft against a loose disc
which is worked by the eccentric, as described.
4. The method of keeping the sliding disc against the face of the loose disc by
means of a spring as described.
5. The method of pushing the sliding disc from the face of the loose disc by
means of steel wedge shaped pieces that are fitted inside the latter, these sliding
against the steel projections on the bushed ring thus separating the two discs and
throwing same out of gear at any desired moment, as described.
Dated this 17th day of January 1889.
EUSTACE WIGZELL.
JOSEPH POLLIT.