IMPROVEMENTS IN INDIA RUBBER ASSISTANT BEARING SPRINGS FOR USE IN RAILWAY & TRAMWAY ENGINES; CARRIAGES & TRUCKS.
Year: 1883

page_text: LETTERS PATENT to George Spencer of 77 Cannon St. in the City of
London, Civil Engineer for an Invention of IMPROVEMENTS IN INDIA RUBBER
ASSISTANT BEARING SPRINGS FOR USE IN RAILWAY & TRAMWAY ENGINES;
CARRIAGES & TRUCKS.
PROVISIONAL SPECIFICATION left by the said George Spencer at the
Office of the Commissioners of Patents on the 18th July 1883.
"
GEORGE SPENCER of 77 Cannon Street in the City of London Civil Engineer
IMPROVEMENTS IN INDIA RUBBER ASSISTANT BEARING SPRINGS FOR USE IN
RAILWAY AND TRAMWAY ENGINES CARRIAGES & TRUCKS
"
My improvements in India Rubber Assistant Bearing Springs for use in Railway
and Tramway Engines, Carriages and trucks consist of improved forms of the
India Rubber Assistant Bearing Springs (known generally as, Attock's and
Spencer's) India Rubber Blocks have been used largely between the underframes
and body frames of railway carriages and trucks to isolate or diminish the jars
from the road or wheels such springs being made solid as described in the specifi-
cation of letters patent No 2145 and dated 31st August 1863 granted to George
Attock, or recessed as described in the specification of Letters Patent No 1435 and
dated 21 April 1873 granted to George Spencer and Walter Mackerzie Smith. In
practice I find such springs as heretofore used to be open to objection the solid
blocks being too resistant, whilst in the recessed ones a large part of the rubber
gives no spring action. Now to obviate these defects according to my present
invention, the springs are constructed with transverse channels or passages so
arranged that not only is all the India Rubber employed brought into action, thus
giving increased elasticity but also air is allowed to pass freely through such
channels in such manner as to aid in keeping the underframe and body-frame dry.
These springs with transverse channels or passages can be made in separate lengths
or they may be continuous along the sides of the carriages

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said George Spencer in the Patent Office on the 18th January 1884.
GEORGE SPENCER, of 77 Cannon St in the City of London Civil Engineer
IMPROVEMENTS IN INDIA RUBBER ASSISTANT BEARING SPRINGS FOR USE IN
RAILWAY AND TRAMWAY ENGINES, CARRIAGES AND TRUCKS
"
My improvements in India Rubber assistant Bearing Springs for use in Railway
and tramway Engines Carriages and trucks consist of improved forms of the India
Rubber assistant Bearing springs known generally as "Attock's" and "Spencer's
India Rubber Blocks have been used largely between the underframes and body
frames of Railway Carriages and trucks to isolate or diminish the jars from the
road or wheels; such springs being made solid as described in the specification of
Letters Patent N° 2145 dated 31st August 1863 granted to George Attock, or
recessed as described in the specification of Letters Patent N° 1435 dated 21 April
1873 granted to George Spencer and Walter Mackersie Smith. In practice I find
such springs as heretofore used to be open to objection: the solid blocks being too
resistant, whilst in the recessed ones a large part of the india-rubber gives no
spring action. Now to obviate these defects according to my present invention
the springs are constructed with transverse channels or passages so arranged that
not only is all the India Rubber employed, brought into action, thus giving
increased elasticity, but also air is allowed to pass freely through such channels, in
such manner as to aid in keeping the underframe and body frame dry. These
springs with transverse channels or passages can be made in separate lengths, or
they may be continuous along the sides ends and cross timbers of the carriages.
To make my invention clear I proceed to more particularly describe it with
reference to the drawings in which Fig 1 shews a side elevation and Fig 1 a plan
of an India rubber block or assistant bearing spring. A is the india rubber;
B, B, are the transverse-channels.
Fig 2 is a side elevation, and Fig 2ª is a plan of another form of my assistant
which
bearing spring. A is the india-rubber; B, B, are the transverse channels;
channels are, in this form, shewn on both sides. The section of the channel formed
as described through the substance or body of the block can, in either case, be
varied at pleasure; but the form I prefer is that shewn by the Figs, viz-having a
parabolic form of section, so as to bring the pressure caused by the insistent weight
through all parts of the india-rubber on to the supporting surface and thus diminish
the cost of the material used.
Having described the nature of my said invention, and the manner of carrying
it into practical effect, I hereby declare that what I consider to be novel and
original, and therefore claim as secured to me under the Letters Patent first
hereinabove in part recited is.-
The use of transverse channels through the substance of india-rubber assistant
bearing springs such as shewn in Figs 1, 1ª, 2 and 2ª, and substantially as herein
described.
In witness whereof I the said George Spencer have hereunto set my hand and
seal this eighteenth day of January in the year of our Lord one thousand eight
hundred and eighty-four.