AN IMPROVED ELASTIC ROBBIN FOR THE SPRINGS OF VEHICLES
Year: 1878

page_text: LETTERS PATENT to Frederick Forder, of Wolverhampton, in the County of
Stafford, Coach Builder, for the Invention of "AN IMPROVED ELASTIC ROBBIN
FOR THE SPRINGS OF VEHICLES."
Sealed the 20th May 1879, and dated the 25th November 1878.
PROVISIONAL SPECIFICATION left by the said Frederick Forder at the Office
of the Commissioners of Patents on the 25th November 1878.
FREDERICK FORDER, of Wolverhampton, in the County of Stafford, Coach Builder.
"AN IMPROVED ELASTIC ROBBIN FOR THE SPRINGS OF VEHICLES."
The robbin is made of alternate layers of india-rubber (preferably vulcanized),
and canvas or other similar material. The layers are of an oval or other convenient
form, and are laid flat upon one another and formed into a solid piece in the
ordinary manner, in which india-rubber and canvas are joined to-gether. The
bearings are formed of metal tubes (preferably of gun-metal), and have a projection
along one side to prevent them from turning in the robbin. The canvas or other
similar material, being in planes in the direction of the strain upon the robbin, pre-
vents the india-rubber from stretching unduly, but allows sufficient elasticity to
materially lessen the shocks to which vehicles are liable. A coating of india-rubber
conceals the joints of the layers.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Frederick Forder in the Great Seal Patent Office on the 23rd
May 1879.
FREDERICK FORDER, of Wolverhampton, in the County of Stafford, Coach Builder.
"AN IMPROVED ELASTIC ROBBIN FOR THE SPRINGS OF VEHICLES."
The robbin is made of alternate layers of india-rubber (preferably vulcanised),
and canvas or other similar material. The layers are of an oval or other convenient
[Price 4d.]

page_text: form, and are laid flat upon one another, and formed into a solid piece in the
ordinary manner, in which india-rubber and canvas are joined together, and which
will be readily understood by a person skilled in the art of india-rubber manu-
facture. The bearings are formed of metal tubes (preferably of gun-metal), and
have a projection along one side to prevent them from turning in the robbin. The
canvas or other similar material being in planes in the direction of the strain upon
the robbin prevents the india-rubber from stretching unduly, but allows sufficient
elasticity to materially lessen the shocks to which vehicles are liable. A coating of
india-rubber conceals and protects the edges of the canvas. A strong leather strap
may if desired be placed around the periphery of the robbin to lessen the degree of
elasticity and to strengthen the robbin.
Having thus stated the nature of my said Invention I will now proceed more
particularly to describe the manner of carrying out the same with reference to the
accompanying Drawing and the letters of reference marked thereon.
Figure 1 is a side elevation, and Figure 2 a vertical section of my improved
elastic robbin as applied to the springs of hansom cabs and other carriages, both
views being drawn full size. Referring to Figure 2 the vertical lines a, a, etc.,
indicate layers of canvas, and the parts b, b, etc., are layers of vulcanised india-
rubber. The layers a, a, etc., and b, b, etc., are preferably of an oval shape, as shewn
at Figure 1. c, c, are the bearings (preferably of gun-metal); the bearings c, c,
have projections d, d, thereon to prevent them from turning in the robbin. The
edges of the layers of canvas are concealed and protected by means of a coating of
india-rubber (preferably vulcanised) around the periphery of the robbin, and the
edges of the canvas within the holes cut through the robbin to receive the bearings
are similarly protected. A leather strap e, e, may be put on around the bobbin, as
shewn, if desired to lend additional stiffness.
Having thus stated the nature of my said Invention and described the method of
carrying out the same, I declare that I do not limit myself to the configuration and
thickness of parts as described and shewn, as such may be varied to suit the special
purpose for which the robbin may be required, but what I claim as ny Invention
and desire to secure by Letters Patent is,-
The clastic robbin (for the springs of vehicles) made of alternate layers of india-
rubber and canvas or similar material, and with or without the leather strap
around the periphery thereof, substantially as herein described, and illustrated by the
Drawing.
In witness whereof, I, the said Frederick Forder, have hereunto set my hand
and seal, this Fourteenth day of May, in the year of our Lord One thousand
aight hundred and seventy-nine
Witness,
HENRY CHILTON,
Clerk to Stephen Watkins,
Assoc. Inst. C.E.,
Patent Office,
Wolverhampton.
FREDERICK FORDER. (L.S.)