Transmitting Motion.
Year: 1887

page_text: Transmitting Motion.
I, SYDNEY PITT of Sutton in the County of Surrey, Gentleman, (a cominunication
to me from abroad by James Fox Mellor and Benjamin Fox Mellor both of Adelaide
in the Province of South Australia, Agricultural Implement Makers) 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 has been devised for the purpose of providing a belt or strap for
transmitting motion which will be less liable to slip than those hitherto made. To
accomplish this object the belt or strap is made with projections on its bearing-surface
instead of being made with a plain bearing surface. This belt must not be used with
ordinary metal pulleys but with pulleys having a coating of some easily impressible
and elastic material (such as india rubber) into which coating the projections on the
belt will press and bite. If preferred, the pulleys when small may be made wholly
of such material.
The projections on the belt or strap may be produced in a variety of ways and of a
variety of material but so long as they are projections that will bite or sink into the
impressible and elastic material with which the pulleys are coated so as to render the
belt less liable to slip it is included in this invention. As illustrations transverse
ridges or projections may be made of cord or wire-or a series of staples or rivets
may be driven through the belt and clinched at the back-or these ridges or
projections may form part of the substance of the belt or strap.
The faces of the pulleys may be coated with any kind of readily impressible and
elastic material (although india rubber is the best) and this may either be made
tubular and slipped over the pulley or it may be in sheets or strips and be secured on
the face of the pulley.
In some cases it will be found inexpedient to have the faces of all the pulleys coated
with the impressible and elastic material as for instance when one or more of them is
or are of large diameter because considerable expense would be saved by dispensing
with such coating. In such cases the belt is twisted so as to have the surface with
J

page_text: the projections bearing on the pulley which is coated as stated and the plain surface
bearing on the ordinary pulley.
Referring to the accompanying drawings Figure 1 represents a belt and pulley
made according to this invention. Figure 2 plan and cross-section of the belt.
A is the pulley and A' the impressible and elastic material with which its face is
coated. B is the belt and B₁ the projecting staples thereon. Figure 3 is a plan of
this improved belting with the staples arranged differently to those in Figure 2.
Figure 4 is a plan of this improved belting in which the staples are substituted by
rivets. Figure 5 shews a double ply belt with the points of the staples clinched.
Figure 6 shews the method of using this improved belting with one pulley coated
with the easily impressible and elastic material and the other one not coated. In this
case it will be seen that the belting is twisted so as to cause the plain surface of the
belt to run over the uncoated pulley and the ribbed surface to run over the coated
pulley.
It is to be understood that any kind of projection may be used on the face of the
belting which will bite or impress itself on to or into the coating on the pulley or
pulleys and any kind of coating may be used for the pulleys into which such
projections will bite or impress themselves and which is elastic in its character.
Having now particularly described and ascertained the nature of the said invention
and in what manner the same is to be performed, I declare that what I claim is :-
1. Belts or straps for transmitting motion having projections on their bearing
surface whether such projections be attached to or made integral parts thereof
or be made part of their substance substantially as herein described and explained.
2. The combination with such belts or straps of a pulley or pulleys coated with an
easily impressible and elastic material (such as india rubber) in the manner and for
the purpose herein described and explained.