Improvements in Piston Packing Rings.
Year: 1892

page_text: Date of Application, 2nd Aug., 1892
Complete Specification Left. 2nd May, 1893-Accepted, 29th July, 1893
PROVISIONAL SPECIFICATION.
Improvements in Piston Packing Rings.
We, THOMAS SHEPHERD of Union Works, Charles Street, Manchester Engineer
and MARK OLIVER of Factory Lane, Oldfield Road, Salford, Merchant, do hereby
declare the nature of our said invention to be as follows:-
Our invention relates to packing rings for pistons and consists of metallic rings.
(preferably steel) made more or less U shape in cross section which fit side by side
into a corresponding recess in the piston with their free ends working against the
sides of the cylinder. The piston is formed in halves to facilitate the introduction.
of the rings and the recess formed to receive the rings is slightly less than the
width of the rings thus leaving a space between the two halves of the piston.
This space allows for adjustment of the rings and is filled by a series of discs of
suitable material surrounding the piston rod.
The rings aforesaid are of such a thickness as to readily give on being compressed
between the two halves of the piston and this elasticity allows of the rings when
compressed to become elongated and so compensate for the wear of the rings.
To compress the rings as above described one or more of the discs aforesaid is
removed according to the amount of wear to be taken up and the nut on the piston
rod end screwed up.
This arrangement is specially advantageous for marine engine pistons as it
considerably facilitates the adjustment of the rings.
Any number of rings may be used arranged side by side and such ringe may be
split or otherwise.
Dated this 30th day of July 1892.
JOHN G. WILSON,
Agent.
COMPLETE SPECIFICATION.
Improvements in Piston Packing Rings.
We THOMAS SHEPHERD of Union Works Charles Street Manchester Engineer,
and MARK OLIVER of Factory Lane, Oldfield Road Salford, Merchant, both in
the County of Lancaster, 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 invention relates to packing rings for pistons and consists principally of
metallic rings (preferably of steel) made more or less U-shape in cross section
which fit side by side into a corresponding recess in the piston with their free ends,
or edges, working against the sides of the cylinder.
The manner in which our said invention is to be performed or carried into
practical effect will be readily understood on reference to the sheet of drawings
hereunto annexed and the following explanation thereof.
Fig. I on the drawings is a sectional view of a metallic piston and packing,
and Fig. 2 is a section taken through the line A-B in Fig. 1. a is part of the
piston rod.
The body of the piston is preferably formed in two halves 6 and 6¹ to facilitate
the introduction of the rings c, and the recess formed to receive same (half in each
portion) is slightly less than the width of the two rings thus leaving a space between
the two halves and b' of the body of the piston, as shown at Fig. 1.
This space allows for adjustment of the rings c and is filled in by a series of

page_text: thin discs or plates d of brass or other suitable material surrounding the
piston rod.
The rings e may be more or less of a U- or V shape in section or of other
suitable trough-like section, being so placed in the recess of the piston body that
their free ends or edges are outwards so as to bear against the internal circumference
of the cylinder.
"
It will be understood that these are preferably not perfect rings but are cut
through at one place as shown at c' Fig. 2 to allow of their easy expansion and
contraction and at the place where they are cut through they are fitted with
steam bits" to prevent the passage of steam, as usual in metallic packing rings.
The rings c are of such a thickness as to readily "give" on being compressed
between the two halves and of the piston and this elasticity allows the rings c
when compressed to become elongated or expanded circumferentially, and so
compensate for the wear of the rings.
To compress the rings e as above described one or more of the discs or plates d
aforesaid is removed to the amount of wear to be taken up, and the nut e on the
end of the piston rod, and those of the connecting bolts f screwed up.
In the drawing two rings c are shown but we wish it to be understood that we
reserve to ourselves the right to use a single ring of this description, or more than
two as may be preferred.
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 :-
The improvements in packing rings for pistons consisting of metallic rings of a
more or less or V-shape in section so placed in a recess formed round the body
of the piston that their free ends or edges shall work in contact with the internal
circumference of the cylinder substantially as herein before described and illustrated
by the drawings annexed.
Dated
GEO. DAVIES & SON,
4, St. Ann's Square, Manchester, Agents for the Applicants.