Improvements in Spring Rings for Metallic Pistons and the like.
Year: 1899

page_text: PROVISIONAL SPECIFICATION.
Improvements in Spring Rings for Metallic Pistons and the like.
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
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, and especially to such spring rings as are usually made by coiling a long
bar of metal round a cylinder
The invention may be applied to the manufacture of spring rings made of
steel, or of brass or other suitable metal or alloy, and the objects of the invention
are to improve and facilitate the manufacture of such spring rings and to manu-
facture them in a more economical manner.
We take a bar of steel or other suitable metal or alloy, of sufficient length,
breadth and thickness as when coiled will form a spring ring of the required
dimensions, and from each end thereof, (but from opposite sides) we cut or plane
off a long wedge shaped piece, so that the two ends are tapered for a length about
equal to one coil of the spring, leaving the central part with parallel sides.
We then take this bar so prepared, in a cold state and bend it into a coil by
passing it endwise between three bending rolls such as are ordinarily employed
for bending boiler plates and the like, or for bending the tires of wheels. Two of
these rollers are mounted horizontally in the same plane a certain distance apart
with their axes parallel and the third is mounted in the centre above the space
between the other two, its axis being also parallel with the others, but. carried
in bearings capable of being raised or lowered so as to regulate the diameter of
the circle to which the bar is bent in forming the coil.
The bar may be coiled close in the bending machine and afterwards opened out
to the height required, or it may be guided into the rolls in such a way that
it will be rolled at once into the form of an open coil ready for use without any
subsequent opening process.

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, and especially to such spring rings as are usually made by coiling a long
bar of metal round a cylinder.
The invention may be applied to the manufacture, of spring rings made of
steel, or of brass or other suitable metal or alloy, and the objects of the invention
are to improve and facilitate the manufacture of such spring rings and to manu-
facture them in a more economical manner.
The nature of our said. invention and the manner in which the same is to be
performed or carried into practical effect will be readily understood on reference
to the annexed sheet of drawings and the following explanation thereof.
We take a bar of steel or other suitable metal or alloy, of sufficient length,
breadth and thickness as when coiled will form a spring ring of the required
dimensions see edge view Fig. 1 and side view Fig. 2, and from each end
thereof, (but from opposite sides) we cut or plane off a long wedge shaped piece
as indicated by the dotted lines on Fig. 2, so that the two ends are tapered for a
length about equal to one coil of the spring, leaving the central part with
parallel sides, as shown by edge view Fig. 3, and side view Fig. 4.
We then take this bar so prepared, in a cold state and bend it into a coil by
passing it endwise between three bending rolls such as are ordinarily employed
for bending boiler plates and the like, or for bending the tires of wheels. Two
of these rollers are mounted horizontally in the same plane a certain distance
apart with their axes parallel and the third is mounted in the centre above the
space between the other two, its axis being also parallel with the others, but
carried in bearings capable of being raised or lowered so as to regulate the
diameter of the circle to which the bar is bent in forming the coil.
་་
The bar may be coiled close in the bending machine as shown at Fig. 5, and
afterwards opened out to the height required, or it may be guided into the
rolls in such a way that it will be rolled at once into the form of an open coil
ready for use without any subsequent opening process, as shown at Fig. 6.
These spring rings thus formed can then be employed in metallic pistons, pump
buckets, piston valves and the like to expand the ordinary packing rings in the
usual manner.
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:.
The improvements in spring rings for metallic pistons and the like, consist-
ing in taking an ordinary rolled bar of metal of the length, width and thickness
required, then cutting planing or otherwise reducing the same as shown by
Figs. 2 and 4 of the annexed drawings, afterwards bending the same in a cold
state into a coil by means of three bending rolls, and lastly opening out the same
to the necessary height if required.
Dated the 15th day of Vavob, 1000
GEO. DAVIES & SON,
Agents for the Applicants, 4, St. Ann's Square, Manchester,