IMPROVEMENTS IN SPRINGS FOR RAILWAY CARRIAGES
Year: 1876

page_text: LETTERS PATENT to Alfred John Dobson and Richard Cook, both of Sheffield,
in the County of York, for the Invention of "IMPROVEMENTS IN SPRINGS
FOR RAILWAY CARRIAGES."
Sealed the 4th August 1876, and dated the 7th February 1876.
PROVISIONAL SPECIFICATION left by the said Alfred John Dobson and
Richard Cook at the Office of the Commissioners of Patents on the 7th February
1876.
ALFRED JOHN. DOBSON and RICHARD COOK, both of Sheffield, in the County of
York.
IMPROVEMENTS IN SPRINGS FOR RAILWAY CARRIAGES."
"
Our said Invention relates,-
First. To the construction of semi-elliptic or bow-shaped steel springs, of either
round, hollow, square, oval, or polygonal bars, or with V, U, or W shaped bars, or
of bars with other suitable cross sectional shapes not heretofore used for this
purpose.
Second. To the construction of central holding clips, clamps, or mandrils in two
parts so arranged as to permit the placing of the bars within the same, and the
holding of the bars in position while allowing their free elastic movement without
interfering with or endangering the action of the bars when under compression;
the said clips, clamps, or mandrils work telescopically one within the other.
Third. To the connection of the aforesaid bars at the ends to bolts or pins by
eyes formed by bending the ends of the bars, which eyes and bolts form hinges or
joints whereon the ends of the bars work freely.
Fourth. To the combination with the half elliptical spring thus constructed of
bars round, square, oval, or otherwise shaped in cross section of a vertical spiral
auxiliary spring, and a sectional bolt for setting the spring and limiting the extent
of its motion.
Fifth. To the combination with the aforesaid bars and spiral spring forming the
elliptical spring of mandrils or clamps at the top and bottom of the spring to hold
the said bars in position.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by the
said Alfred John Dobson and Richard Cook in the Great Seal Patent Office on
the 7th August 1876.
ALFRED JOHN DOBSON and RICHARD COOK, both of Sheffield, in the County of
"IMPROVEMENTS IN SPRINGS FOR RAILWAY CARRIAGES."
York.
Our Invention relates to improvements in springs for railway carriages, and is
designed to increase the utility of the peculiar class of springs described in the
Specification of Letters Patent, dated the 3rd day of January, A.D. 1873, No. 37.
The said springs are elliptical, and formed of series of bars or rods placed side by
side in the top and bottom portions or halves of the said springs, and connected to
pins or bolts at the ends, and arranged in the peculiar manner described in the
Specification.
According to our present Invention we construct semi-elliptical or bow-shaped
steel springs of either round, hollow, square, oval, or polygonal bars or V, U, or W
shaped bars, or bars with other suitable cross sectional shapes not heretofore used
for this purpose, placed side by side and parallel with each other. We provide these
springs with central holding clips, clamps, or mandrils constructed in two parts so
arranged as to permit the placing of the bars within the same, as in the spring
described in the said former Specification, and to hold the bars in position while
allowing them free elastic movement without interfering with or endangering the
action of the bars when under compression; the parts of the said clips, clamps, or
mandrils work telescopically one within the other. We connect the aforesaid bars
at the ends to bolts or pins by eyes formed by bending the ends of the bars, which
eyes and bolts serve as hinges or joints whereon the ends of the bars work freely.
We combine with the semi-elliptical spring thus constructed of bars round, square,
oval, or otherwise shaped in cross section, and arranged side by side a vertical
spiral auxiliary spring, and a bolt for setting or adjusting the spring, and limiting
the extent of its motion.
DESCRIPTION OF THE DRAWING.
Figure 1 is a plan or top view of a spring constructed according to this Invention.
Figure 2 is a longitudinal vertical section of the same.
Figure 3 shews some of the transverse sectional forms of the bars which may be
used in our improved springs.
Like letters indicate the same parts throughout the Drawing.
a, a, are the bars, and a¹, a', are the eyes at the ends thereof; b, b, are the bolts or
pins to which the bars are connected by the said eyes; c is the central holding clip,
clamp, or mandril, made in two parts, c¹, c², fitted to work telescopically together; e
is the base or flange whereby the said mandril is secured to the carriage frame; c
is the part in which the bars a are fitted and secured; d is the vertical auxiliary
spiral spring coiled around the said mandril; e is the adjusting bolt.
Having thus fully described our said Invention, and the manner of performing
the same, we wish it understood that we claim a scini-elliptical or bow-shaped
Anring for a railway carriage constructed of bars or rods of any of the contine