IMPROVEMENTS IN THE MODE OF APPLYING SPRINGS USED FOR CONTROLLING THE SIDE PLAY OF BOGIE TRUCKS OF ENGINES, TENDERS, CARRIAGES, AND WAGONS USED ON RAILWAYS AND TRAMWAYS
Year: 1882

page_text: LETTERS PATENT to Hugh Smellie, of Kilmarnock, in the County of Ayr,
North Britain, Engineer, for an Invention of "IMPROVEMENTS IN THE MODE
OF APPLYING SPRINGS USED FOR CONTROLLING THE SIDE PLAY OF BOGIE
TRUCKS OF ENGINES, TENDERS, CARRIAGES, AND WAGONS USED ON
RAILWAYS AND TRAMWAYS."
"
PROVISIONAL SPECIFICATION left by the said Hugh Smellie at the Office
of the Commissioners of Patents on the 21st January 1882.
HUGH SMELLIE, of Kilmarnock, in the County of Ayr, North Britain, Engineer.
IMPROVEMENTS IN THE MODE OF APPLYING SPRINGS USED FOR CONTROLLING
THE SIDE PLAY OF BOGIE TRUCKS OF ENGINES, TENDERS, CARRIAGES AND
WAGONS USED ON RAILWAYS AND TRAMWAYS."
My improvements consist in making the controlling springs on both sides of the
bogie pin resist the lateral movement of the bogie truck so that to whichever side
the bogie truck moves both springs are compressed instead of the springs on one
side being compressed and those on the other relieved from compression as on the
plans now in use.
The drawings Figs 1, 2 and 3 show one method of carrying out my invention
similar parts being marked by similar letters in each figure.
S is the spring shown in this case of india rubber B is the bogie pin which
along with the casting C approaches to or recedes from D a part of the bogie frame
when the engine or other vehicle is on a curve. When the casting C approaches D
the spring S is compressed by means of the piece E and plate F. When the
casting C recedes from D the piece E draws the rod R the shoulder on the rod R
draws the plate P and thus compresses the spring.
It is therefore clear that to whichever side the bogie truck moves the springs on
both sides are compressed. The compression of the spring is regulated by screwing
the rod R either in or out of the piece E as required by means of a spanner on the
part T of the rod. The rod is prevented from unscrewing by the plate U passed
over T and fixed by suitable means to the casting W.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Hugh Smellie in the Great Seal Patent Office on the 21st July
1882.
HUGH SMELLIE of Kilmarnock in the County of Ayr, North Britain, Engineer.
"IMPROVEMENTS IN THE MODE OF APPLYING SPRINGS USED FOR CONTROLLING
THE SIDE PLAY OF BOGIE TRUCKS OF ENGINES, TENDERS, CARRIAGES, AND
WAGONS USED ON RAILWAYS AND TRAMWAYS."
My improvements consist in making the controlling springs on both sides of the
bogie pin or fixed centre resist the lateral movement of the bogie truck so that to
whichever side the bogie truck moves both springs are compressed instead of the
springs on one side being compressed and those on the other relieved from
compression as on the plan now in use.
The drawings Figs 1, 2 and 3 show one method of carrying out my invention
similar parts being inarked by similar letters in each figure. S is the spring shewn
in this case of india rubber, B is the bogie pin which along with the casting C
approaches to or recedes from D a part of the bogie frame when the engine or
other vehicle is on a curve. When the casting C approaches D the spring S is
'compressed by means of the piece E and plate F. When the casting C recedes
from D the piece E draws the rod R the shoulder on the rod R draws the plate P.
and thus compresses the spring. It is therefore clear that to whichever side the
bogie truck moves the springs on both sides are compressed. The compression of
the spring is regulated by screwing the rod R either in or out of the piece E as
required by means of a sinner on the part T of the rod. The rod is prevented
from unscrewing by the plate U passed over T and fixed by suitable means to the
casting W.
My method of controlling the side play of bogie trucks by causing the springs
at both sides of the centres of such trucks to be compressed whenever there is
lateral movement of the bogie truck whether it be to one side or to the other may
obviously be applied to bogie trucks differing in construction from that shewn in
the drawings by way of illustration, as for example my invention may be applied
to bogie trucks having only two wheels instead of four as shewn.
Having described the nature of my said invention and in what manner it is to
be performed I would have it understood that what I claim as secured to me under
the Letters Patent hereinbefore in part recited is the arrangement of springs for
controlling the side play of bogie trucks in such a manner that to whichever side
such bogie trucks move the springs at both sides of the bogie pin or centre
are compressed so as to co-operate in controlling the side play substantially as
described.
In witness whereof. I the said Hugh Smellie have hereunto set my hand
and seal this nineteenth day of July in the year of our Lord one thousand
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