IMPROVEMENTS IN THE CONSTRUCTION OF PISTONS And Pump BucKETS
Year: 1878

page_text: :
LETTERS PATENT to George Ben Goodfellow, of Hyde, in the County of
Chester, Engineer, for the Invention of " IMPROVEMENTS IN THE CONSTRUCTION
OF PISTONS And Pump BucKETS.”
Sealed the 13th September 1878, and dated the 21st March 1878.
PROVISIONAL SPECIFICATION left by the said George Ben Goodfellow
at the Office of the Commissioners of Patents on the 21st March 1878.
GEORGE BEN GOODFELLOW, of Hyde, in the County of Chester, Engineer.
"IMPROVEMENTS IN THE CONSTRUCTION OF PISTONS AND PUMP BUCKETS,"
1
My Invention is applicable to those metallic pistons and pump buckets in which
two packing rings with internal bevel surfaces are used, the said packing rings
being expanded by a ring with a double bevelled face, in which a spiral groove is
cut to impart the requisite pressure to the packing rings. These double rings have
hitherto been made of cast iron or brass, but these metals are objectionable, as they
are liable to break when the pistons or pump buckets are subjected to great
variations in the pressure of steam or water employed.
Now, my Invention consists in making these rings with the double bevelled face
and spiral groove of steel, whereby the elasticity and durability are greatly
increased; the steel of which these rings are made is either cast in a mould, or by
preference rolled into a solid hoop and consolidated by pressure.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said George Ben Goodfellow in the Great Seal Patent Office on the
20th September 1878.
GEORGE BEN GOODFELLOW, of Hyde, in the County of Chester, Engineer.
"IMPROVEMENTS IN THE CONSTRUCTION OF PISTONS AND PUMP BUCKETS."
My Invention is applicable to those metallic pistons and pump buckets in which
two packing rings with internal bevel surfaces are used, the said packing rings being
expanded by a ring with a double bevelled face in which a spiral groove is cut to
impart the requisite pressure to the packing rings. These double rings have
hitherto been made of cast iron or brass, but these metals are objectionable, as they
are liable to break when the pistons or pump buckets are subjected to great
variations in the pressure of steam or water employed.
Now, my Invention consists in making these rings with the double bevelled face
and spiral groove of steel, whereby the elasticity and durability are greatly
increased; the steel of which these rings are made is either cast in a mould, or by:
preference rolled into a solid hoop and consolidated by pressure.
And in order that my Invention may be fully understood and readily carried
into operation, I will proceed to describe the accompanying Sheet of Drawings, in
which―
Fig. 1 is a plan, and Fig. 2 a transverse section of a piston constructed according
to my improvements.
Fig. 3 is a plan, and Fig. 4 a side view of my improved expanding ring.
a is the body of the piston; b, the lid, which is held down by the screw cas
usual; d, d, are the ordinary packing rings with internal bevel surfaces which are
expanded to form a steam-tight joint against the cylinder and against the flange of 2
the block a and the lid 6 by the ring e, which is provided with a double bevelled
face and with a spiral groove as usual.
Rings similar to e have heretofore been made of cast iron or brass, but such rings
are objectionable for the reasons above stated. I now make them of steel, either cast
in a mould or forged, and rolled into a solid hoop and consolidated by pressure.
The mode of rolling the rings and consolidating the metal may be done in any
convenient manner.
3
Having thus stated the nature of my Invention, and described the manner of
performing the same, I declare that what I claim as my Invention is, making the
expanding rings with double bevelled faces for pistons and pump buckets of solid g
steel, either cast in a mould or rolled, as shewn and described.
In witness whereof, I, the said George Ben Goodfellow, have hereunto set
my hand and seal, this Seventeenth day of September, One thousand eight
hundred and seventy-eight.
G. B. GOODFELLOW. (L.S.)