Improvements relating to the Turntables Employed at the Crossings, of Lines of Railways.
Year: 1888

page_text: Date of Application, 13th Nov., 1888
Complete Specification Left, 12th Aug., 1889-Accepted, 21st Sept. 1889.
PROVISIONAL SPECIFICATION.
[Communicated from abroad by CONSTANT GOLLY, of St. Dié, France, Metal Founder.]
Improvements relating to the Turntables Employed at the Crossings,
of Lines of Railways.
I, JAMES STEVENSON of Gray's Inn Chambers 20 High Holborn, London W.C.
Civil Engineer and Patent Agent, do hereby declare the nature of this invention to be
as follows:-
My Invention refers particularly to the turntables employed for the diversion of the
rolling stock in connection with light railways, such for instance as are adopted in the
carrying out of mining operations, quarrying, contractors work; and as occur also at
wharves, warehouses, and so forth.
:-
Hitherto as usually canstructed, such turntables have consisted of a.
circular plate
carried and capable of turning upon a central pivot disposed below the platform, and
fixed in the well of the device. This system has disadvantages, with a view to over-
come which, I proceed in accordance with my Invention, as under; that is to say :-
The under surface of the table or platform, in the centre thereof, is formed with a
circular flange or annulus the metal of which is of a suitable thickness, and so shaped
as to allow of same being received and to rotate with a minimum of friction in a
corresponding dished out annulus or channel or groove, formed in the upper surface
of the base plate disposed in the well of the device; said circular groove being kept
supplied with lubricating material to ensure easy working of the parts.
The diameter of the central working annulus aforesaid is proportioned relatively to
that of the table or platform. With a view also to ensure the same being truly in
equilibrium when the centre of gravity of the superimposed weight becomes incident
outside the said central annulus-and to avoid a tendency of the table to
$5 cant or
get out of a horizontal plane-then I furnish the under surface of the table or platform
at a short distance from its peripheral edge, with a series of lugs or denticulations
forming a circular rack, the teeth of which take into a circular groove formed there
under in the upper surface of the base plate of the well of the device, said groove
being also kept supplied with a lubricant.
Dated this Thirteenth day of November 1888
COMPLETE SPECIFICATION.
Improvements relating to the Turntables Employed at the Crossings
of Lines of Railways.
I, JAMES STEVENSON of Gray's Inn Chambers, 20 High Holborn, London, W.C.
Civil Engineer and Patent Agent, do hereby declare the nature of this invention and
in what manner the same is to be performed, to be particularly described and ascer-
tained in and by the following statement:-
Hitherto, as usually constructed, railway turntables have consisted of a circular
plate carried and capable of turning upon, a central pivot arranged below the platform
and fixed in the "well." This system is attended with many disadvantages with a
view to overcome which, the present Invention is devised; and in accordance with
which I proceed as follows, reference also being had to the accompanying
drawing: That is to say. The under surface of the table or platform A B, is formed
in the centre with annulus CD, the metal of which is of a thickness adapted to the
requirements and so shaped as to allow of same being received and to rotate with a
minimum of friction in, the recessed annulus or circular grooves E, F, formed in the
upper surface of base plate and kept supplied with lubricating material to ensure easy
working of the parts and a minimum of friction.

page_text: "
With a view also to ensure the platform being truly in equilibrium when the centre
of gravity of the superimposed weight becomes incident outside the central annulus
C, D, and to avoid consequent tendency of the platform to "cant' or get out of the
horizontal plane-I provide the under surface of the platform at a short distance
from its peripheral edge with a series of lugs P, P, forming a rack the denticulations
of which take into the circular groove R formed in the upper surface of the base
plate of the "well" G, H, said groove being also kept supplied with lubricating
material.
Having now particularly described and ascertained the nature of my said Invention,
and in what manner the same is to be performed, I declare that what I claim is :-
The improvements in railway turntables substantially as herein described and shown
and for the purposes specified.
Data LL
CA 1000