Improvements in the Construction of Piston Valves.
Year: 1891

page_text: Date of Application, 10th Oct., 1891-Accepted, 14th Nov., 1891
COMPLETE SPECIFICATION.
Improvements in the Construction of Piston Valves.
I, HENRY CARLISLE Eagle Foundry, Sheffield, in the County of York,
Manufacturer 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 :-
My present invention relates to certain improvements in the construction of the
rings of spring piston-valves, and more particularly to the rings of piston valves as
described in the Specification of my prior Patent No. 15825, of Oct. 7, 1890.
The object of my present invention is to simplify the workmanship, reduce the
number of parts, and to render its action more perfect.
The invention is clearly shown in the sheet of drawings annexed to this
Specification, in which like letters of reference indicate like parts in either of
the figures.
The spring that I prefer to use in connection with my improved rings is the one
described in Patent No. 2155, 1884, it being well adapted to the purpose, but I do
not confine myself to this special spring although I have indicated its construction
in the drawings.
On reference to the drawings, it will be seen that I use an outside ring A, of
sufficient width to enclose the periphery of the piston block B, and the cover plate C,
in the manner described in my Patent No. 15825 before mentioned.
On the internal face of this outside ring A, I form an annular projection or
collar D, its lower face fitting against the upper side of the flange E, which forms
part of the piston block B, and its inner face which is set back so as to leave a
Hange F, is suited to receive the coils of the spring S, and it extends to the centre
or thereabouts of the ring A.
A loose ring G, is made to correspond with the before described collar D, having
a flange H, which represents the one, F, upon D.
The description thus far applies to either of the figures, which will be understood
to be sectional elevations of the said rings and spring, and of a portion of the piston
block and cover plate.
I prefer that the loose ring G, shall engage with the outside ring A, and to
accomplish this I form the two adjacent edges of G, and D, into a rabbet at R, as
shown in Fig. 1, or I may bevil the ring G, and correspondingly undercut the
collar D, as shown in Fig. 2.
These are both very simple and convenient methods of carrying out what I
require, but other equivalent plans may be adopted.
Both the outside and inside rings are cut diagonally in the usual manner.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be carried into practice, I declare
that what I claim is :-
1-A piston valve having an outside ring A, bearing against the peripheries of
the piston block B, and the coverplate C; with a solid internal ring or collar D,
and a loose corresponding ring G, acted upon by a spring of any suitable construction,
substantially as hereinbefore described and shown.
2-For piston valves, an outside divided ring, having on its inner face a solid
annular projection, ring, or collar D, in combination with a loose divided ring G,
corresponding in shape with the solid collar D, and engaging with it by means of a

page_text: rabbet, or its equivalent at R, and their internal faces prepared to receive a spring'
such as S, substantially as hereinbefore described and illustrated.
Dated the 8th day of October 1891.
ROBT. F. DRURY, Fel. Inst. P.A.,
.Bank Buildings, George Street, Sheffield, Agent for Applicant.