Improvements relating to Piston Rings and Springs for same.
Year: 1899

page_text: Date of Application, 13th Jan., 1899
Complete Specification Left, 13th Oct., 1899 -Accepted, 16th Dec., 1899
TRUVISIONAL SITIFICATION.
Improvements relating to Piston Rings and Springs for same.
I, HENRY CARLISLE, of Eagle Foundry, Stalkers Lees Road, City of Sheffield,
Engineer, do hereby declare the nature of my invention to be as follows:--
My invention relates to improvements in the construction of piston rings and
also in the springs for same, and more particularly to those used with steam at
a very high pressure, the object being to counteract the effect of such steam
when it gets at the back of the rings, the said effect being to force the rings with
increased pressure against the surface of the cylinder, causing undue wear and
tear.
Rings such as I refer to are usually recessed upon their inside face, until their
cross section corresponds somewhat to the form of the letter L, and the spring
which is preferably of wire partly coiled and partly bent into convolutions,
is placed within such recessed part of the rings.
I propose to undercut the top and bottom of the spring recess so that when
the rings are placed in position, the spring will be held and retained within the
recess, and will thus prevent any undue expansion of the rings.
To prevent the expansion of the spring beyond what is desired, I make the joint
plate which is used at the junction of the spring ends, to act as a stop also.
According to one method I make the said joint plate with two or more holes
through it to engage with the two ends of the wire of which the spring is made, and
which are bent at right angles to accomplish that purpose.
According to another method I make the joint plate with a T shaped head, and
a longitudinal slot through which a short bolt with a head of special form on one
side, and a nut upon the other, is passed.
The Tshaped head, and the head of the bolt engage between the coils of the
spring, and the bolt is adjustable in the slot, thus the amount of expansion can
be regulated.
1
1113
1
1000
Improvements relating to Piston Rings and Springs for same.
I, HENRY CARLISLE, of Eagle Foundry, Stalkers Lees Road, City of Sheffield,
Engineer, do hereby declare the nature of this invention and in what manner the
[Price Sd.]

page_text: same is to be performed, to be particularly described and ascertained in and by
the following statement:-
:-
My invention relates to improvements in the construction of piston rings and
also in the springs for same, and more particularly to those used with steam at
a very high pressure, the object being to counteract the effect of such high pres-
sure steam when it gets to the back of the rings, the said effect being to force the
rings with increased pressure against the surface of the cylinder, causing undue
wear and tear.
The accompanying drawings illustrate the manner in which I carry my invention
into practice.
Fig. 1, is a cross section of my improved piston ring.
Fig. 2. represents the key used in securing the ends of the spring.
Figs. 3 and 4, the bolts used in fastening the key in alternative arrangements.
Fig. 5, two views of the spring with all the parts of fastening (as Fig. 3) in
position.
Fig. 6, two similar views with the fastening (as in Fig. 4) in position.
Rings such as I prefer are usually recessed upon their inside face, until their
cross section corresponds somewhat to the form of the letter L, and the spring
which is preferably of wire partly coiled and partly bent into convolutions, is
placed within such recessed part of the rings, as described in my former Patent
No. 21558
I form a groove C, (see Fig. 1), in the top and bottom faces of the spring recess
so that when the rings A. and B, are placed in position the spring will be held and
retained by the small grooves within the recess, and will thus prevent any undue
expansion of the rings.
To prevent the expansion of the spring beyond what is desired, I make the joint
plate or key K (Fig. 2,) which is used at the junction of the spring ends, also to
act as a stop.
According to the method which I prefer, as shown in Fig. 6, I make the joint
plate or key K, (Fig. 2) with a T shaped head T, and a longitudinal slot S, through
which a short bolt E, (Fig. 4) with a head H, of special form on one side, and a
nut upon the other, is passed.
The shaped head of the key K (Fig. 2) and the head of the bolt E (Fig. 4)
engage between the coils of the spring N, as shown in Fig. 6, and the bolt is
adjustable in the slot S, thus the amount of expansion can be regulated.
In the modification shown in Fig. 5, the bolt E, is provided with a round head
and a square nut which engages between the coil of the wire (see Fig. 3), the
circular formation of the head permits the screw to be turned round and thus
screwed into the square nut which is prevented revolving.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
T claim, is-
1-In piston rings, a groove such as C, to receive the wire of the spring N, for
the purpose hereinbefore described and set forth.
2 As a means for preventing the undue expansion of the spring and rings by
steam (which has obtained an entrance to the back), the joint plate or key K,
(Fig. 2) with a cross bolt such as E, having a head to fit between the coils of the
spring as hereinbefore described and shown.
Dated the 12th day of October 1899.
ROBT. F. DRURY, C.P.A.,
Agent for Applicant,
Bank Buildings, George Street, Sheffield.