Improvements in Vehicle or Machinery Wheels whereby Jar.or Shock is Diminished.
Year: 1887

page_text: Date of Application, 16th July, 1887.
Specification Accepted, 23rd Aug., 1887.
COMPLETE SPECIFICATION.
Improvements in Vehicle or Machinery Wheels whereby Jar.or
Shock is Diminished.
We, THOMAS BOLAS of 8 Grove Terrace, Chiswick, Middlesex, Analytical Chemist;
and JOHN BRAILSFORD BRIGHT, of 31 Golden Square, Borough of the Strand,
Middlesex, Barrister-at-Law; do hereby declare the nature of this invention and in
what manner the same is to be performed, to be particularly described and ascertained
in and by the following statement :-
This invention relates to an improved method of putting into practice the invention
of one of us for which Letters Patent No. 14,367 of 1885 were granted.
In the hub or nave of the wheel we interpose caoutchouc, in such a way as to
insulate or separate by caoutchouc the central portion of the hub or nave from the
outer circumference of the hub or nave. By the outer circumference of the hub or
nave, we mean that portion of the hub or nave or those portions of the hub or nave to
which the spokes are attached. The word spokes in the above sentence must be taken
as including the web of a wheel constructed with a web instead of spokes. In
order that the caoutchouc may be held with certainty in position we prefer to roughen
groove indent or corrugate those portions of the hub which are in immediate contact
with the caoutchouc or to stud such parts with holes or pins, and we place the
caoutchouc in position while in a soft or uncured state, and cure or vulcanise such
caoutchouc while in position, thus insuring exact fit and firmness; but we place in
immediate contact with the metal of the hub a layer of caoutchouc or guttapercha so
mixed as to vulcanise hard. The object of this layer of hard rubber is to insure a
firm hold upon the metal, and the space between the two layers of hard rubber (or
mixture that will vulcanise hard,) is filled with ordinary rubber mixture that will
vulcanise soft; this intermediate soft rubber being compact, cellular, or perforated,
according to the degree of resistance to strain required.
For the purposes of our invention we either construct the hub of the wheel of
metal preferably iron, or those parts of the hub which come in immediate contact
with the hard rubber or mixture as above described, we construct of metal-preferably
iron; and, should the wheel be a wooden one, the metal and wood must be joined and
compacted by suitable means.

page_text: Figure 1 represents the section of a compound hub made according to our inven-
tion and applicable to wooden wheels and Fig. 2 represents the section of the central
part of a metal wheel.
In each Figure, A represents the axle or the hole for the axle, B the inner metal
part of the hub, Ć the caoutchouc or vulcanised mixtures, and D the outer metal ring,
which may or may not be one with the spokes. The waved lines at band b¹ indicate
the roughened, grooved, indented, pinned, or corrugated surfaces of B and D
respectively while the dotted lines c, c, indicate the division between the interior soft
rubber and the external layers of hard rubber or hard gutiapercha.
Having now particularly described and ascertained the nature of our said Invention,
and in what manner the same is to be performed, we declare that what we claim is :
.
The method of insulating the central part of the hub or nave of a wheel from the
peripheral part of the same by the use of hard rubber or hard vulcanisable mixture,
and of soft rubber, in combination, substantially as described.