An Improvement in Spring Rings for Metallic Pistons and the like.
Year: 1897

page_text: Date of Application, 15th Sept., 1897
Complete Snanification Loft 11th June 1808. Accented 16th July 1000
PROVISIONAL SPECIFICATION.
An Improvement in Spring Rings for Metallic Pistons and the like.
We, THOMAS OLDILAM and FRED OLDILAM, both of Engineering Works, Dukin-
field, in the County of Chester, Engineers, do hereby declare the nature of this
invention to be as follows:-
This invention relates to the spring rings which are employed in metallic
pistons, pump buckets, piston valves and the like to expand the metallic packing
rings, whether such springs are made by coiling a long bar round a cylinder or
by cutting the coil out of a ring of metal.
The invention may be applied to spring rings made of steel or of brass or of
other suitable metal or alloy, and the objects of such invention are to lighten
such springs without reducing their strength, and to enable the spring rings to be
got into and out of position more easily than the spring rings as hitherto con-
structed.
The invention consists in corrugating the metal or alloy of which such spring
rings are made, the said corrugations running transversely across the breadth of
the ring, that is, parallel to the axis of the piston or bucket to which the spring
ring is to be applied. When the spring rings are made by coiling a bar in a
spiral form round a cylinder we corrugate the bar before it is coiled and plane
the edges either before or after corrugation, and when the spring ring is formed
by making a spiral cut through a cast or other ring or cylinder of the required
breadth and diameter in a screw cutting lathe or otherwise we corrugate the ring
or cylinder before the spiral cut is made and open out the same afterwards in
the usual manner.
Spring rings thus made from previously corrugated metal can be made of
considerably thinner metal than plain rings without reducing the strength thereof,
and it will be found that they are not only lighter and more economical but they
are less stiff and can be got into and out of place in the packing with greater
ease than the ordinary spring rings made from plain bars or rings as hereto-
'fore practised.
We, THOMAS OLDHAM and FRED OLDHAM, both of Engineering Works, Dukin-
field, in the County of Chester, Engineers, do hereby declare the nature of this
Price 8d.]

page_text: -
invention and in what manner the same is to be performed to be particularly
described and ascertained in and by the following statement:-
This invention relates to the spring rings which are employed in metallic
pistons, pump buckets, piston valves and the like to expand the metallic packing
rings, whether such spring rings are made by coiling a long bar round a cylinder or
by cutting the coil out of a ring of metal.
The invention may be applied to spring rings made of steel or of brass or of
other suitable metal or alloy, and the objects of such invention are to lighten
such springs without reducing their strength, and to enable the spring rings to be
got into and out of position more easily than the spring rings as hitherto con-
structed.
The invention (which will be readily understood on reference to the annexed
drawings) consists in corrugating the metal or alloy of which such spring rings
are made, as shewn by Fig. 1, the said corrugations running transversely across
the breadth of the ring, that is, parallel to the axis of the piston or bucket to
which the spring ring is to be applied. When the spring ring is made by coil-
ing a bar in a spiral form round a cylinder, we corrugate the bar before it is
coiled see Fig. 2, and we may plane the edges either before corrugations as seen
at Fig. 3, or after corrugation; and when the said ring is made by running a
bar through a "mill" we may corrugate it at the same time; when the spring
ring is formed by making a spiral cut through a cast or other ring or cylinder
of the required breadth and diameter in a screw cutting lathe, or otherwise,
we corrugate the ring or cylinder before the spiral cut is made and open out the
same afterwards in the usual manner. The bar from which the spring ring is
made may be of any suitable section.
Spring rings thus made from previously corrugated metal can be made of
considerably thinner metal than plain rings without reducing the strength thereof,
and it will be found that they are not only lighter and more economical but they
are less stiff and can be got into and out of place in the packing with greater
ease than the ordinary spring rings made from plain bars or rings as hereto-
fore practised.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed we declare that what
we claim is:-
A spring ring for pistons, pump-buckets, piston-valves and the like formed with
corrugations substantially as and for the purposes herein before described.
Dated 10+1
1000
GEO. DAVIES & SON,
Agents for the Applicants, 4, St. Ann's Square, Manchester.