MENTS IN RAILWAY TURNTABLES
Year: 1864

page_text: LETTERS PATENT to Marmaduke Darell Jeffreys, of Ebury Street,
Pimlico, in the County of Middlesex, for the Invention of "IMPROVE-
PROVISIONAL SPECIFICATION left by the said Marmaduke Darell Jeffreys
at the Office of the Commissioners of Patents, with his Petition, on the
17th September 1864.
I, MARMADUKE DARELL JEFFREYS, of Ebury Street, Pimlico, in the County
5 of Middlesex, do hereby declare the nature of the said Invention for " IMPROVE
MENTS IN RAILWAY TURNTABLES," to be as follows:-
This Invention relates to railway turntables such as are used for turning
locomotive engines and their tenders, whether such engines and tenders
are made separate or combined in one, and consists principally in providing
such turntables with mechanism whereby steam and the rotary power
of the driving wheels of the locomotive engine are utilized for the purpose
Cof turning the table instead of turning the same by hand gear as hitherto
practised.
3
In one method of carrying out my Invention, for example, I propose to
5 cut through the rails on the turntable at the points where the driving
wheels would stand when the engine is on the table, and to place friction
wheels mounted upon a shaft immediately below the table, so that the
driving wheels of the locomotive engine, when on the turntable, will rest upon

page_text: the said friction wheels instead of upon the rails, and in connection with
the said shaft below the table I arrange suitable toothed or friction
gearing (or a combination of both) so that when the locomotive engine is
in its proper position on the table, if the engine is set to work, the driving
wheels acting upon the friction wheels will put the shaft in motion, and
the gearing in connection with the latter will cause the table with the engine
on it to be turned round. Levers will be arranged for raising and lowering
the catches (so as to release and stop the turntable) in such a position
that the engineer can reach them without leaving the engine, and hence it
will be seen that the engineer can take his engine on to the turntable and
turn it round by its own power without requiring assistance from any other
person.
In the case of locomotive engines where the running wheels are coupled
with the driving wheels, it will be necessary to have "dummy" friction wheels
for the running wheels of the engine. to. rest upon, so as to allow them to
revolve without propelling the engine..
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Marmaduke Darell Jeffreys in the Great Seal Patent Office
on the 17th March 1865.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, MARMADUKE 2
DARELL JEFFREYS, of Ebury Street, Pimlico, in the County of Middlesex,
send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters,
Patent, bearing date the Seventeenth day of September, in the year of our.
Lord One thousand eight hundred and sixty-four, in the twenty-eighth year 2
of Her reign,, did, for Herself, Her heirs and successors, give and grant:
unto me, the said Marmaduke Darell Jeffreys, Her special licence that I, the.
said Marmaduke Darell Jeffreys, my executors, administrators, and assigns, or.
such others as I, the said Marmaduke Darell Jeffreys, my executors, adminis-,
trators, and assigns, should at any time agree with, and, no others, from time 3
to time and at all times thereafter during the term therein expressed, should
and lawfully might make, use, exercise, and vend, within the United Kingdom
of Great Britain and Ireland, the Channel Islands, and Isle of Man, an,
Invention for "IMPROVEMENTS IN RAILWAY TURNTABLES," upon the condition.
(amongst others) that I, the said Marmaduke Darell Jeffreys, my executors or 3
administrators, by an instrument in writing under my, or, their, or one of their..

page_text: hands and seals, should particularly describe and ascertain the nature
of the said Invention, and in what manner the same was to be performed,
and cause the saine to be filed in. the Great Seal. Patent Office within
six calendar months next and immediately. after the date of the said Letters
Patent. ".
NOW KNOW YE, that I, the said Marmaduke Darell Jeffreys, do hereby:
declare the nature of my said Invention, and in what. manner the same is
to bei performed, to be particularly described and ascertained in and by the.
following statement in writing, and on reference, being had to the accom-s
panying Sheet of Drawings, that is to say:
+
This Invention relates to railway turntables such as are used for turning.
locomotive engines and their tenders, whether such engines and tenders
are made.separate or combined in one, and consists principally in providing
such turntables with 'mechanism whereby steam and the rotary power.
of the driving wheels of the locomotive engine are utilized for the purpose.of.
turning the table instead of turning the same by hand. gear. as hitlierto
practised.
.
In cone: method of carrying out my !Invention, for example, I propose:
to cut-through. the rails on the turntable at the..points, where the driving,
wheels would stand when the engine is on, the table, and to place friction.
wheels mounted upon a shaft immediately below the table, so that, the
driving wheels of the locomotive engine, 'when on the turntable, will rest?
upon the said friction wheels instead of upon the, rails, and in connection..
with the said shaft below the table I arrange suitable toothed or friction.
gearing (or a combination of both), so that when the locomotive engine
is in its proper position on the table, if the engine is set to work, the
driving wheels acting upon the friction wheels will, put the shaft in motion,
and the gearing in connection with the latter will cause the table with the;
engine, on ait to be turned round. Levers will be arranged for raising and,
lowering the catches (so as to release; and stop: the turntable) in such ä
position that the engineer can reach them without leaving the engine, and:
hence it will be seen that the engineer can take his engine on to the turntable
andi turn it round by its own power without requiring assistance from any.
other person...
In the case of locomotive engines where the running wheels are coupled :
with the driving wheels, it will be necessary to have "dummy" friction
wheels for the running wheels of the engine: to rest upon, so as to allow them
to revolve without propelling the engine.
*Such being the nature and object of my said Invention for "Improve-

page_text: ments in Railway Turntables," I will now proceed to describe more in
detail the manner in which the same is to be or may be performed or carried
into practical effect; and in order that the same may be distinctly understood,:
I have annexed hereunto a Sheet of Drawings illustrative thereof, and have:
marked the same with figures and letters of reference corresponding with. 5
those in the following explanation thereof, that is to say:
In the annexed Drawing, Figure.1 represents a plan view of a locomotive
turntable constructed according to my improvements, and Figure 2 a longi-:
tudinal section of the same; Figure 3. is a transverse section taken through?
about the line 1, 2, in Figure 1, looking outwards, and Figure 4 is a similar; 1
view taken through about the line 3, 4; in the same Figure, looking towards
the centre
'
a, a, is the turntable, which is supported upon four bearing wheels b, b,:
running upon a circular rail c, c, and turns upon the central pillar. d; d,
the said rail and pillar being placed in a well sunk below the surface 1
of the railway, and being supported upon: suitable masonry e, e. The:
rails f,f, are cut away at the points where the driving wheels of the engine.
stand when upon the turntable, and immediately below this part: are a pair
of friction wheels g, g, mounted on a shaft below the turntable in such a;
manner that the upper part of their peripheries fills up the space where: 2
the rails have been cut away; and the driving wheels of the engine' rešt,
thereon. The shaft upon which these friction wheels are keyed is provided
with bevil wheels h, h, in gear with other similar bevil wheels.keyed upon the
diagonal shafts i, i, upon the outer ends of which the bearing wheels b, b, of:
the turntable are fixed.
It will now be evident that supposing the engine to be in the position:
shown in Figure 2 and the turntable free to revolve, if the engine is put in.
motion, the driving wheels, instead of propelling the engine forward, will:
drive the friction wheels 9, 9, and thus by means of the bevil wheels h, h, and,
diagonal shafts i, i, impart motion to the bearing wheels b, b, and hence cause
the table with the engine upon it to turn round.
The method of locking and releasing the table is as follows:-k, k, (see.
Figure 2) are two catches or dogs which take into two corresponding.notches..
formed in the edge of the well between the rails. These two catches are-
either released or locked simultaneously by means of the lever 1, l, which the
engineer can reach without leaving the engine.
In using this turntable the engineer drives his engine slowly on to the
table until the driving wheels thereof rest upon the friction. wheels g, g;.
he then immediately lifts the catches or dogs h, k, by means of the lever 1, 1,

page_text: and on admitting steam to the cylinders the engine will by means of the
frixton wheels 9, 9, (and other gearing previously described) cause the-table
to be turned round. When the table has performed, half a revolution he
throws in the catches k, k, by means of the lever 1, 1, and thus locks the
table. This locking of the table of necessity stops the revolution of the
friction wheels 9, 9, which immediately form (as it were) an integral.
part of the rails, and the continued revolution of the driving wheels simul-
taneously propels the engine forwards, leaving the turntable in a suitable
position to perform the same service for another engine. If thought requisite
the same movement of the lever 1, 1, which throws in the catches might be
made to apply a break to the friction wheels.
It will will be seen upon referring to the Drawing that there are two
pairs of friction wheels with their corresponding gearing, in order that in
whichever position the table may be it is always ready to receive an engine
coming in either direction.
Having now particularly described the nature and object of my said
Invention for "Improvements in Railway Turntables," together with the
manner in which the same is to be or may be performed or carried into
practical effect, I would remark in conclusion that I claim as my Invention,
providing such turntables with friction or other suitable mechanism whereby
steam and the rotary power of the driving wheels of the locomotive engine are
or may be utilized, for the purpose of turning the table, instead of turning
the same by hand gear as hitherto practised.
In witness whereof, I, the said Marmaduke Darell Jeffreys, have here-
unto set my hand and seal, this Fourteenth day of March, in the year
of our Lord One thousand eight hundred and sixty-five.
M. DARELL JEFFREYS. (L.S.)
Witness,
GEORGE DAVIES,
Patent Agent,
1, Serle St., Lincoln's Inn.