Improvement in Pulley Coverings.
Year: 1889

page_text: Date of Application, 21st May, 1889-Accepted, 6th July,
1889
COMPLE
DIFCITIGATION.
Improvement in Pulley Coverings.
I, ANTHONY SMITH DAVIS of Port Deposit in the County of Cecil and State of
Maryland, United States of America, manufacturer, 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 :-
My invention relates to an improved Pulley Covering for preventing machine
belts from slipping.
The object of the invention is to provide a new article of manufacture consisting of
an improved pulley covering material having one surface coated with a water-soluble
cement, and adapted for permanent adhesion to the pulley; the purpose being to
place the finished article on the market in a condition ready prepared for application
to the pulley.
The accompanying drawing illustrates the improved covering.
Figure 1 is a view of a piece of the pulley-covering ready to be applied.
Figure 2 is a view of a cement-coated muslin base sometimes used in applying the
covering.
Figure 3 is a view of a pulley having its rim covered with the improved article.
A water-proof composition consisting of boiled linseed oil and ground cork in large
proportions, and one or more other ingredients such as paper-pulp, wood-pulp, saw-
dust, or suitable fibrous material in small proportions-also india rubber or other
vegetable gums may enter as ingredients,-is spread while hot and in a plastic state
on a backing of loosely-woven fabric of jute or cotton, and pressed thereon by means
of rollers.
In the drawing the letter a designates the backing of loosely woven fabric, and b
the composition of boiled oil and ground cork or similar material attached to the
backing; this composition and backing constitute a fabric possessing some elasticity
which is a very desirable characteristic. Instead of the said composition any other
elastic material may be used.
To the said backing a of loosely-woven fabric 1 supply a coat of suitable cement, c,
which must be soluble in water, and when the cement is dry the pulley-covering is
complete and fully prepared for the pulley, and may be rolled like belting, and kept
an indefinite time, stored or shipped.
Any water-soluble cement may be used which will dry to permit this covering to
be rolled, and which when made wet will cause the fabric to adhere to the face of the
pulley.
It will he seen that the features of this article are a backing of woven-fabric, a
facing of an elastic composition on one side of the said backing, and a coating of
water-soluble cement on the other side.
Whatever kind of water-soluble cement is used I apply it to the wove-fabric backing
preferably in three coats; when applied as the first coat it should be sufficiently thin
or limpid as to facilitate its penetration into the woven backing, thereby so far incor-
porating it with the loosely woven backing as to ensure a good hold or grip. When
the succeeding coats have been applied and dried the article is complete.
To apply the covering to a pulley: having cut the covering to the proper
size for the pulley the face of the pulley must first be cleaned of all grease
or other matter. This can be done by the use of lye or strong soap and
water. The pulley D should be wiped dry. The covering should be wet with
clean water and then allowed to stand until the cement is softened; the cement
side of the covering is then to be applied to the face of the pulley and rubbed
down hard to exclude the air. If the belt is on the pulley the latter should be turned
so as to bring the joint formed by the adjoining ends of the cover under the back side

page_text: of the belt; the latter will thus hold the covering until the cement sets. If the belt
is off the pulley the covering may be confined thereto until the cement sets by winding
a cord around the cover.
Another method of attaching the covering is to first apply to the pulley a cement-
coated muslin base e, that is a strip of muslin, e, having cement, f, on one surface-
and then, when this muslin has dried on the pulley, apply the cement side, e, of the
covering, b, to the said muslin base.
I am aware that elastic fabrics of various kinds have been used as pulley-coverings,
and that it has been proposed to use for this purpose paper-mache, also a vulcanized
rubber surface having an inside coating of raw rubber to cement said vulcanized
rubber to the pulley.
From what has heretofore been stated it will be seen that my
covering differs materially from these.
Having now particularly described and ascertained the nature of my inven-
tion and in what manner the same is to be performed, I declare that what I
claim is:
1st: A covering for pulleys having in combination, a backing of loosely-woven
material; a facing of elastic material substantially as described, spread and dried on
one side of said backing, and a coating of water-soluble cement on the other side of
the backing, as set forth.
2nd: The method of attaching cement-coated coverings to pulleys, consisting of
first applying to the pulley a cement-coated muslin base e, and then applying the
cement side of the covering to the said muslin base.
Dated this Thirtieth day of April 1889.
ANTHONY SMITH DAVIS.