IMPROVEMENTS IN SPRINGS FOR PISTONS, AND IN THE MANU- FACTURE OF THE SAME, AND THEIR APPLICATION TO PISTON RINGS AND PISTONS
Year: 1877

page_text: PROVISIONAL SPECIFICATION left by William Huginn Walker at the Office
of the Commissioners of Patents on the 30th October 1877.
WILLIAM HUGINN WALKER, of Sheffield, in the West Riding of the County of
York, Engineer. "IMPROVEMENTS IN SPRINGS FOR PISTONS, AND IN THE MANU-
FACTURE OF THE SAME, AND THEIR APPLICATION TO PISTON RINGS AND PISTONS."
These improvements relate to the production of the elastic pressure required for
pistons of steam or water or other such like matters or pistons for the like or other
purposes by the employment of a spring or springs of a novel description, and made
in a manner herein-after specified, instead of the springs hitherto used for the same
purpose.
These improvements consist in the employment of springs of corrugated steel or
other suitable material or materials, corrugated as herein specified, the said corrugated
springs being of a width and thickness varying with the size of the pistons in which
they are intended to be used.
"
The corrugations in the springs may be so made as that they represent a series of
"hollows and rounds or curves set alternately in opposite directions, or may further
be so made as that they represent a series of Vees set alternately in opposite direc-
tions, or may further be so made as that they represent a series of forms which
would be modifications of the above forms, as, for instance, of a form which would
be in longitudinal section, " hollow and round," or concave and convex alter-
nately, but which would be in cross section (across the face of the spring), firstly, as to
the "convex" "round" or " projection" of the spring, or straight line "bevilled off,"
or "rounded off" at each end; secondly, as to the "hollow" or concave" part of
the said spring, a straight line only..
86
k
"
The improved spring will be made from a strip or sheet of steel or other suitable
material or materials of suitable thickness, which, after being pared to the right
width or otherwise, will be heated in an ordinary furnace, and then passed through
a pair of suitably shaped rolls, the said rolls being formed with projections some-
what similar to the teeth of a spur wheel, which will be caused to revolve by gearing
as ordinarily used, and which will thus give to the strip or sheet the desired corru-
gation when the said strip or sheet is passed between them.

page_text: To form the corrugated strip of which the projections or "rounds" are "bevilled
of" or
"rounded off at each end (in section across the face of the strip) one roll of
the pair (say, the top roll) will be made "bevilled off" or "rounded off" at each
end of the projections (in section across the face of the roll), and the other roll (say,
the bottom roll) will be hollowed out to correspond with and receive the projections
of the top roll, which said top and bottom roll will so fit into and work with one
another as that when the strip is passed through or between them the said rolls
will form the strip with "bevilled off" or "rounded off" projections, as above
specified.
The springs or strips for springs formed as above specified may be hardened and
tempered in the ordinary manner.
Instead of employing one corrugated spring in a piston, two or more may be used
in one piston if desirable.
The springs of the form and made in the manner above specified may be so used as
to bear directly against the piston ring or piston rings of pistons, especially those of
which the projections are "bevilled off" or " rounded off" at each end (in section
across the face of the spring), or may be so used as to bear against a ring or rings
placed between the said spring or springs and the said piston ring or piston rings.