IMPROVEMENTS IN PULLEYS
Year: 1884

page_text: We MELVIN LE ROY JACK and JUDSON LEVATOR THOMSON of Syracuse, in the
County of Onondaga and State of New York, one of the United States of America,
Geutlemen, do hereby declare the nature of our invention for IMPROVEMENTS IN
PULLEYS, 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 special reference to tho application of paper facings to
metallic pulleys, the object of the invention being to render said facings more
durable and to also impart to them the crowning form required to insure a true
tracking of the belt on said facing, and to that end our invention consists in the
novel construction of the facing and means for securing the same to the pulley as
hereinafter fully described and set forth in the claims.
The invention is fully illustrated in the annexed drawings wherein Fig 1 is a
side view of a pulley provided with our improved facing. Fig 2 is a transverse
section of an ordinary metallic pulley. Fig 3 is a transverse section of said pulley
with our improved facing applied thereto. Fig 4 is a transverse section of our
invention as applied to a multiple belt carrying pulley, and Fig 5 illustrates
modifications of our invention.
Similar letters of reference indicate corresponding parts.
A represents an ordinary metallic pulley. In applying our invention to said
pulley we employ a strip or strips of cloth or suitable textile fabric of the same
width as the pulley and of proper length to reach around the periphery thereof.
Said fabric we saturate with a suitable cement, for which we have successfully
used a compound of flour, sal soda, alum, borax and glue thoroughly commingled
and dissolved.
The strip or strips of fabric thus prepared we wrap around the periphery of the
pulley and apply thereto the requisite number of layers to increase the circum-
ference of the pulley as may be desired and as represented at a in Fig 1 of the
drawing.
In applying the layers of textile fabric as aforesaid they become effectually
cemented together and to the pulley and form a strong and permanent lagging or
base for the reception of the facing of the pulley.
them
The facing we construct of two or more layers of paper or other fibrous material
formed in sheets and cut into strips of successively diminished width and after
saturating said strips in cement similar to that before described we wrap
around the textile fabric lagging a and in so doing we apply the widest strip first
and the other strips successively one over the other, each succeeding strip or layer
being narrower than the preceding strip, thus bringing the narrowest layer at the
outside and in the centre of the face of the pulley as illustrated at 6 in Fig 3 of the
drawing.

page_text: Said layers of fibrous material become thoroughly cemented together and to the
textile fabric lagging a by the cement which is thoroughly incorporated in said
fibrous material and the whole forms a solid and tenacious body when the cement
has become set or solidified.
The diminishing widths of the successive layers of fibrous material produces the
requisite crown or convexity of the face of the pulley to insure true tracking of
the belt running on said pulley.
In forming a multiple belt carrying pulley we apply to the periphery of the
pulley one or more layers of textile fabric cemented thereon in the manner
hereinbefore described, the fabric being of sufficient width to reach across the face
of the pulley.
On the textile fabric wrapping we fasten the requisite number of crowning or
convex belt carrying faces c, c, c, each of which is formed of one or more layers
of successively diminishing widths cemented together and to the textile fabric
wrapping on the pulley, the textile fabric forming a tie which securely retains the
respective faces c, c, c, in their position and each of said faces has the requisite
crown to maintain the belt thereon and prevent the same from coming in contact
with the belt running on the adjacent face of the pulley.
In case the metallic pulley is of the desired diameter and needs no further
enlargement the textile fabric lagging a can be omitted and the crowned facing of
fibrous material can be applied direct to the metal face of the pulley as represented
in Fig 5 of the drawing.
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:-
1. The combination with a pulley, of a crowned facing composed of two or more
layers of fibrous material of successively diminishing widths cemented together and
to the periphery of the pulley with the narrowest layer at the outside substantially
as described and shown.
2. The combination with a pulley, of a lagging composed of one or more layers
of textile fabric wrapped around the periphery of the pulley and cemented thereon,
and a crowned facing composed of two or more layers of fibrous material of
successively diminishing widthis cemented together and to the aforesaid lagging
with the narrowest layer of fibrous material at the outside, substantially as
described and shown.
3. A multiple belt carrying pulley having two or more crowned faces each
composed of two or more layers of fibrous material of successively diminished
widths cemented together and on the periphery of the pulley, each succeeding
overlying layer being narrower than the preceding layer substantially as described
and shown.
4. The combination of a pulley of one or more layers of textile fabric wrapped
around the periphery of the pulley and covering the entire width thereof and
cemented thereon, and two or more crowned faces each composed of two or more
layers of fibrous material of successively diminished widths cemented together and
on the textile fabric wrapping aforesaid substantially as described and shown.