IMPROVEMENTS IN BOGIE-TRUCKS FOR RAILWAY LOCOMOTIVES, TENDERS, CARRIAGES AND WAGONS
Year: 1883

page_text: LETTERS PATENT to Walter Mackersie Smith, Engineer, of Taybank, Tayport,
Fifeshire for an Invention of IMPROVEMENTS IN BOGIE-TRUCKS FOR RAILWAY
LOCOMOTIVES, TENDERS, CARRIAGES AND WAGONS
PROVISIONAL SPECIFICATION left by the said Walter Mackersie Smith
at the Office of the Commissioners of Patents on the 13th April 1883.
WALTER MACKERSIE SMITH, Engineer of Taybank, Tayport, Fifeshire,
"IMPROVEMENTS IN BOGIE-TRUCKS FOR RAILWAY LOCOMOTIVES, TENDERS, CARRIAGES
AND WAGONS"
My invention has for its object improvements in bogie-trucks for railway
locomotives, tenders, carriages and wagons.
Referring to the accompanying sheet of drawings whereof Fig 1 is a cross section,
and Fig 2 a sectional plan,-I provide a curved casting a fixed to the engine, and
a wrought iron beam or beams 6 connected to the bogie frames by links c fitted
with or without springs d, these links being hung to swing at a tangent to the
curve described by the portion of the curved casting to which the links are
connected. The casting a works or moves between curved plates or castings e and
is guided thereby, and may be controlled by side springs. The curved casting
and plates e connecting the bogie frames may be dispensed with, the bogie being
controlled by links hung as described.
In a modified arrangement the curved casting fixed to the engine is fitted with
a swing beam having circular movement, this beam being connected to the bogie
frame by links provided with suitable springs placed by preference outside the
bogie frame.
The arrangements are similar when applying my invention to tenders, carriages
and wagons.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Walter Mackersie Smith in the Great Seal Patent Office on the
12th October 1883.
WALTER MACKERSIE SMITH, Engineer, of Taybank, Tayport, Fifeshire
IMPROVEMENTS IN BOGLE TRUCKS FOR RAILWAY LOCOMOTIVES, TENDERS, CARRIAGES, 5
AND WAGONS
My invention has for its object improvements in bogie trucks for railway
locomotive engines, tenders, carriages, and wagons.
In the accompanying drawings Fig 1 sheet 1 is a cross section, and Fig 2 a
sectional plan of a bogie with apparatus according to my invention I provido a 1
curved casting a fixed to the engine and a wrought iron beam or beams b
connected to the bogie frames by links c fitted with or without springs d, these
links being hung to swing at a tangent to the curve described by the portion of
the curved casting to which the links are connected.
The casting a works or moves between curved plates or castings c, and is guided 1
thereby and may be controlled by side springs.
A modification of my invention is illustrated in sheet 2, Fig 3 being a sectional
elevation, Fig 4 a sectional plan, Fig 5 a cross section, and Fig 6 a section through
the spring at the end of the links c.
a is the curved casting, b the wrought iron beam (or beams) fixed to the
casting swivelling in the curved casting a, thus allowing the links or bolts c to
swing approximately in a straight line. The links c may be fitted with or without
springs d.
Another modification of my invention is illustrated in sheet 3, Fig 7 being a
sectional elevation, Fig 8 a sectional plan, and Fig 9 a cross section. In this
modification the beam is formed as a transverse spring S, and is connected at the
ends to the links o similarly to the rigid beams b before described, and as
illustrated. The links c may be fitted with or without springs d as shown.
In another modification of my invention referring to sheets 1 and 3 the curved
plates or castings e may be dispensed with and the casting a (which in this case
does not require to be curved) may be caused to describe the necessary curve by
the links being hung as shewn.
It is to be noted that although the springs & hereinabove referred to are
represented as of india rubber, yet any other suitable construction of spring may
be applied as and for the purpose of this part of my invention
By the use of my invention tendency of the bogie to side oscillations when
running on a straight line is checked by the curved casting and curved guiding
plates, turning round of the bogio when the vehicle leaves the line is prevented,-
and by the action of the springs at the ends of the links, and the transverse spring
shewn in sheet 3 the bogie wheels are permitted to stand on a plane not parallel
to the plane on which the other wheels of the engine or carriage stand without
unduly straining the frame of the engine or carriage
the
Having thus described the nature of my said invention and the manner of
carrying it into practical effect I hereby declare that what I claim as new is ;-
1. The combination of the curved casting a, with the links chung as and for
purpose described with reference to and illustrated in sheet 1 of the drawings.
2. The combination of the curved casting a, swing beam b and casting l
swivelling on the curved casting a and links as and for the purpose described with
reference to and illustrated in sheet 2 of the drawings.
3. The combination of the curved casting a spring beam & and links cas and for
the purpose described with reference to sheet 3 of the drawings.

page_text: 4. Causing the casting a to describe the necessary curve by means of the links
(hung as shewn on sheets 1 and 3) without the aid of the curved guiding plates e
as above set forth.
5. In a bogie having a swing beam or beams the use of springs (such as d) in
conjunction with swing links substantially as and for the purpose hereinabove
described
In Witness whereof I the said Walter Mackersie Smith have hereunto set my
hand and seal this tenth day of October in the year of our Lord one thousand
eight hundred and eighty-three.
W. M. SMITH (L.S.)