IMPROVEMENTS IN METALLIC. PISTONS
Year: 1846

page_text: MATHIR
of Salford near Manchester, in the County of Lancaster and COLIN
ATHLR of the same place Millwrights and Engineer send greeting
WHEREAS Het present most Excellent Majesty Queen Victoria, by ller
Roval Letters Patent under the Great Seal of Great Britain beamng date at
Westminster the 28th day of Apul in the ninth year of Her eign did. for
Herselt Her hens and successors. give and giant unto us the said William
Mather and Colin Mather our exoi admots and assigns Her especial
that we the said Wilham
licence full power sole privilege and authority
Mather and Golm Mather our exors admors and assigns, on such others a.
we the said Wilham Mather and Colin Mather
of
evos admots, or
assigns should at any time agree with and no others, from tune to time and
at all times during the term of years therein expressed should and lawfully
might make use exercise and vend within England Wales and the Town
Berwick-upon-Tweed on Invention of "IMPROVEMENTS IN METALLIC.
PISTONS," in which said Letters Patent is contamed a proviso that we the
said William Mather and Colin Mather shall cause a particular description of
the nature of our said Invention and in what mannet the same is to be
performed, to be inrolled m He said Majesty's High Count of Chancery
within six calendar months next and immediately after the date of the said
in part recited Letters Patent as in and by the same reference being
thereunto had, will more fully and at large appear
NOW KNOW YE, that in compliance with the said proviso we the said
Wilham Mather and Colin Mather, do hereby declare that the nature of our
said Invention and the manner in which the same to be performed, are
[Price 8d]

page_text: fully described and ascertained in and by the following statement thereof,
reference being had to the Drawing hereunto annexed, and to the figures and
letters marked thereon that is to say -
Our Invention consists of a mode of packing pistons by using a combination
of two helical spings and, in order that the Invention may be fully under-
stood and readily carried into effect we will proceed to describe the Diawing,
in the various Figures of which the same letters of reference are used to indi
Cate similar parts
Figure shows a plan of a piston constructed according to our Invention
the upper plate or cover being removed Figure 2 shews a side view of the
piston complete within a cylinder, which is shewn in section Figure 3 is a
section of the piston, Figure 1 is a section of the two spings of which the
packing is composed they being shewn as it compressed between the two
plates of the piston by the upper plate of the piston being screwed down tight
on the body of the piston, and Figure shews a side view of the inner spring,
separately in an expanded state ashews the body of the piston, b, a part
of the piston rod. c is the top plate or cover of the piston which is fixed by
three screws d. d by which plate arc a groove or channel is formed all round
the piston for the packing, e is the inner spring and the outer sping, and
9, g. are two filling or stopping bits placed across the two openings where the
two ends of the outer spring come there being recesses formed in the outer
sping to receive them in order to stop the steam passing down or up through
the splits The springs e and are made by fist forming a cylinder by casting
and then cutting out a portion of the metal in an inclined direction, a vertical
cut being made at each of the points e¹ e and J. and in putting the springs e
and together we cause the points e¹ and to come at the opposite side of the
piston to each other The outer spring f is formed with an inner flange or a
projecting im and the inner spring e comes between the flauges, and there-
fore the elastic force of the spring e tends to separate or open out the sping f
and thus to cause the spring to press the top and bottom surfaces of the
spring
e and
against the top and bottom plates of the piston and as the springs
requne to be compressed by coiling up into a less diameter to introduce
the piston into a cylinder. the springs e and will exert an expensive force
tending to assume then large diameter. and thus will the spring constantly
fill up the cvlinder in which it is working notwithstanding any wear which
may take place both in respect to the cylinder and the packing. the upper cover
of the piston remaining fixed in its place after it has been once sciewed up by
the screws, the packing requning no further pressure after the first putting
together of the piston

page_text: Having thus described the nature of our Invention we would remark that
we are aware that it has before been proposed to pack a piston with a sping
Similar to e and we mention this fact in order to state that we do not claim
the same in its separate state but what we clum is the packing of pistons
by the use of helical springs in combination with springs e
In witness whereof the said William Mather have hereunto set ou
hand and seal this Fifteenth day of August in the year of our Loid
One thousand eight hundred and forty-six
WILLIAM (1. s) MATHER
AND BE IT REMEMBERED, that on the Fifteenth day of August, in
the year of our Lord 1846 the atoresaid William Mather came before our
said Lads the Queen in Her Chancers and acknowledged the Specification
aforesaid and all and every thing therein contained and specified in form
above winten And also the Specification aforesaid was stamped according
to the tenor of the Statute made for that purpose
Enrolled the Twenty-second day of October in the year of our Lord One