An Improved Steam Packing, suitable for other Fluid Pressure.
Year: 1893

page_text: Date of Application, 3rd May, 1893
Complete Specification Left, 3rd Feb., 1894-Accepted, 3rd May, 1894
PROVISIONAL SPECIFICATION.
An Improved Steam Packing, suitable for other Fluid Pressure.
I JOSEPH YATES of 30 Pimlico Road London S.W. Engineer do hereby
declare the nature of this invention to be as follows:-
This invention relates to an improvement to the invention described in the
Specification of the Patent granted to me bearing date September 4-1891 and
numbered 14975 and consists in an improved arrangement for packing the rocking
piston. This packing is constructed of metal turned at right angles preferably
formed of four pieces joined together by sliding joints which admit of expansion in
all directions by the action of the steam or other fluid pressure acting upon it on
entrance into the cylinder. On the back movement during exhaust the packing is
not pressed against sides of cylinder as there is no pressure of steam acting upon
it to expand it. The packing as described is placed on each side of the piston, and
retained by suitable holder which keeps it in its place but admits of the expansion
and contraction. This holder is preferably formed of a piece of sheet metal secured
to the piston, having side tongues which bear upon the packing. If desirable a
spring appliance may be added to expand packing.
Dated this 3rd day of May 1893.
FREDERIC PRINCE,
Agent for Applicant.
COMPLETE SPECIFICATION.
An Improved Steam Packing, suitable for other Fluid Pressure.
I, JOSEPH YATES, of 304, Pimlico Road, London, S.W., Engineer, 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:-
This invention primarily relates to an improved packing for the piston of a
motor according to the Specification of a Patent granted to me bearing date
4th September 1891, and numbered 14,975: and will be best understood by
describing the same with aid of the accompanying drawings.
Figure 1, illustrates a partial sectional side elevation of a motor according to the
Specification of the aforesaid Patent fitted with the packing according to this
invention.
Figure 2, front view of piston illustrating the packing attached.
Figure 3, side view of piston partially in section shewing packing attached.
Figures 4 and 5, perspective views of parts of the packing showing mode of
joining same.
A, casing for piston answering to a usual cylinder; B, the piston thereof, which
in working moves forwards and backwards in casing A, from its bottom being
attached to the cross axle C: H, steam ports.
This piston is made steam tight by the aid of the packing according to this
invention which preferably consists of four pieces of right angle metal T, joining
together at T', by the arrangement of joint shown consisting of an overlapping
piece T, which may be cast with or attached in any suitable way to the pieces T by
which the packing is enabled to expand on straight lines in all directions, and yet
keep steam tight. This packing is held to the piston B, by the fingers T', of the

page_text: piece T', secured to the piston so that the fingers T', hold the packing pressed
tight on to the piston, but not so tight as to prevent expansion by the steam as
required to keep the piston steam tight in the cylinder. On the entrance of the
steam it at once acts on the sides T, of the packing thereby expanding it tight in
the cylinder when the exhaust takes place the pressure of the steam being
removed from the packing on the return stroke the packing comes back practically
free from bearing against inside of cylinder, as there is no pressure of steam upon
the sides T, to expand it. It will be understood that this arrangement of packing
is on each side of piston. The expansion of the packing may if desired be assisted
by any kind of suitable spring pressure acting on the inner sides.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
A packing for a piston reciprocating in a curve, constructed substantially as
hereinbefore described and illustrated by the accompanying drawings.
Dated this 3rd day of February 1894
FREDERIC PRINCE,
37, Cursitor Street, Chancery Lane, London, E.C.,
Agent for Applicant.