Pulleys.
Year: 1895

page_text: Date claimed for Patent under Sect. 103 of Act,
being date of first Foreign Application (in 24th Dec., 1894
United States of America),
ate of Application (in United Kingdom), 30th May, 1895
Complete Specification Left, 30th May, 1895-Accepted, 23th Sept., 1895
COMPLETE SPECIFICATION.
Pulleys.
I, CHARLES W. MCELROY, of Meriden, in the County of Newhaven and State
of Connecticut, U.S.A., Salesman, 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 :-
The invention relates to the class of pulleys that are used in the transmission of
power, which are provided with an exterior skin or covering to increase the
traction of the belting, and it also relates to the process of building up or covering
such pulleys; and the object is to provide a complete pulley or a covering which
can be applied to any common pulley, that is simple, cheap, and easily constructed
and which shall have a surface that can be readily renewed at any time if it
becomes worn or filled with oil, which surface will be smooth, tenacious and hard,
yet somewhat elastic and adhesive whereby a superior contact is insured between
the pulley and the belt and the tractive power is considerably increased.
Referring to the accompanying drawings which illustrate the invention:
Figure 1 is a view of the face of an ordinary polished pulley.
Figure 2 is a view of the face of such a pulley at one stage during the operation
of building it up or covering it.
Figure 3 is a face view of the finished pulley. Figure 4 is a side view of the
same; and
Figure 5 is an enlarged section through a portion of the cover representing the
manner of building it up.
In the views 1 indicates the body of any common form of driving or shaft sheave or
pulley wheel which may be made of iron, brass, wood, paper or similar materials. The
driving face of the rim 2 of the pulley may, of course, be flat, curved, grooved, conical
or any other common shape. To the face of the pulley after it has been properly
cleaned to remove oil and dirt is applied a cement 3 containing a strongly adhesive
substance, such as glue or a similar material, incorporated with a small quantity of
gelatine, pitch or gum, for instance such as rubber or tar, which will keep the
adhesive substance in a tenacious and somewhat elastic condition and prevent it
from so hardening as to become glassy or brittle. This cement is preferably
applied with a brush in a heated semi-liquid state. Outside of this layer of cement
is placed a cushioning layer 4, preferably a band of canvas but which may be any
common woven fabric, as cloth, or any fibrous animal or vegetable material, as
leather, paper, wood or cork. When this cushioning layer or filler has thoroughly
adhered to the interior layer, an outer layer or shell 5 of cement, having similar
characteristics to the inner layer, is applied to the face of the cushioning layer to fill its
Price Rd1

page_text: pores, making it smooth and providing a hard, tenacious and attractive working
surface.
When pulleys are built up or covered in this manner or when a pliable cover
formed of an inner elastic cementing material, a band of cushioning material and
an outer adhesive surface layer is applied to the face of the pulley, a working
surface is provided that is very smooth and without air spaces, thus insuring perfect
contact between the pulley and the belting so that there will be no slip. The
working surface of this cover being hard as well as somewhat elastic has long life
and does not break away, for it is not brittle and the interior filling or cushioning
layer yields enough to prevent any cracking of this outer skin or layer which, of
course, permeates between the fibres or pores of the filling and is thus very strongly
held in position. Of course, the inner layer of adhesive cement which is tenacious
yet slightly yielding permeates the interstices of the filling also and holds it firmly
in position on the face of the pulley; and further, the cushioning layer which holds
strongly to the interior adhesive layer and to the exterior surfacing layer of
cementing material, being between them, relieves the interior or holding layer
from the direct strain and wear of the belt so that there is not a direct pull tending
to tear the filling from the pulley. When the cement is formed with a quantity of
animal glue the exterior face of the outer layer will have considerable tractive
force, that is, it is somewhat sticky when the belt runs around it but of course it
does not stick enough to allow the belt to adhere when standing idle for any time,
nor is it sticky enough to cause the belt to adhere so as to follow around the
pulley but it has been found in practice that with pulleys having surfaces built
as above described belts can be run slack even when running at high speed or can
be run directly in oil without slipping. If the surface of the pulley embodying
the within described improvement has become worn it can be quickly renewed at
any time by cleaning with warm water, then smoothing off the surface and applying
an exterior layer of the cementing material.
;
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what. I
claim is :
A pulley covering, consisting of an inner layer of cementing material, a filling
or cushioning band of flexible material, and an exterior skin of an elastic, adhesive
or sticky cementing material, substantially as specified.
Dated this Twentieth day of May A.D. 1895.
CHARLES W. MELROY.
Boult & Wade,
Agent for the Applicant.