Pulleys.
Year: 1888

page_text: Date of Application, 9th Mar., 1888
Specification Accepted, 25th May, 1888
Pulleys.
I, CHARLES HALSTEAD, of Thornton Farm, near the City of Providence, County of
Providence, and State of Rhode Island, United States of America, Market Gardener,
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 object of my invention is to provide a tenacious and effective covering for
rollers, sheaves, or pulleys; and to this end my invention consists in removing the
impurities from raw hide, in a solution of soda carbonate and water, then submitting
it to a bath of pure hot water, then adding a sufficient quantity of water to bring it
to a suitable consistency for filtration, then filtering and evaporating the liquid, and
finally casting the semi-fluid residuum about the surface of the roller or article to be
covered.
In the accompanying drawings Figure 1 represents the mould in which the semi-
fluid residuum is cast; and,
Figure 2 represents a wheel surrounded by an elastic annulus which is covered by
the composition cast about it.
I first boil raw hide in a solution of soda carbonate, and water, until the various
impurities used in cleaning and curing the hide are discharged. This solution
generally consists of three pounds of soda carbonato to ten gallons of water, although
these proportions may be varied, and in it I place the raw hide cut up into small
pieces. I place about one hundred pounds of the raw hide in this solution, and allow
it to boil therein for about fifteen minutes, which I deem a sufficient length of time. to
cleanse the raw hido of its impurities, although in some instances a less time may be
sufficient, or a longer time may be required.
After the impurities have been removed from the raw hide by the action of the
water and soda carbonate thereon, 1 submit it to a bath of pure hot water for about
thirty minutes, and then add a sufficient quantity of water to bring it to a suitable
consistency for filtration. I then filter the matter through a seive, the meshes of
which are of a sufficient size to prevent the fatty matter from passing through, and
transfer the filtered semi-fluid to an evaporator, where it is boiled until it obtains such

page_text: a consistency that it will solidify. From ten to fifteen hours I deem a sufficient timo
to effect this result. The semi-fluid matter is then run off into a mould, or cylindrical
case surrounding the roller, sheave or pulley, which is to be covered or lagged.
In the drawings A represents the sheave, roller, or pulley, N, the mould or caso in
which it is placed, and C, the receptacle in which the semi-liquid substance is poured.
In some cases the roller, sheave or pulley is surrounded by some elastic covering
of cloth, rubber, or other springy substanco as shown in Figure 2, in which
D designates the elastic material placed around the rim of the roller A. When tho
article is finished and ready for use the cloth or rubber forms an annular elastic
foundation for the substance which has been cast around.
After the substance has become sufficiently solidified the roller, pulley, or sheave,
thus lagged or covered is removed to a drying room where it is allowed to remain for
several days.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the samo is to be performed, I declare that what
I claim is,
1. The process which consists in first removing the impurities from the raw hide in
a solution of soda carbonate and water, second, submitting it to a bath of pure hot
water, third, filtering and evaporating the liquid, and fourth, casting the semi-fluid
about the surface of the roller or articlo to be covered, substantially as and for tho
purposes described.
2. A roller or pulley having a covering consisting of raw hide which has been
boiled down in water, and afterwards solidified about the rim of the roller or
pulley.
3. The combination of a roller or pulley, an annulus of elastic material upon the
rim thereof, and a covering consisting of raw hide which has been boiled down in
water and afterwards solidified around the annulus of elastic material.
Dated this 9th day of March 1888.
ABEL & IMRAY.