Improvements in Sheet-metal Pulleys.
Year: 1894

page_text: Date of Application, 15th Aug., 1894-Accepted, 8th Sept., 1894
COMPLETE SPECIFICATION.
Improvements in Sheet-metal Pulleys.
I, OLIVER WILLIAM KETCHUM, of 323, King Street West, in the City of
Toronto, in the County of York, in the Province of Ontario, Canada, Manu-
facturer, 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 improvements in sheet-metal pulleys, in which the web
or central portion is formed of sheet-metal and the object of the invention is to
devise a simple, strong and efficient means of attachment of the web to the hub of
the pulley, and it consists essentially of forming bosses in the flange of the hub
having holes partially parallel to the axis, while the remaining portion is tapered in
shape so as to receive taper-shaped open ended bosses formed up from the web,
rivets with tapered heads being provided whereby the web may be secured to the
flange of the hub, and the parts being otherwise arranged and constructed in detail
as hereinafter more particularly explained.
The drawing represents a sectional perspective view of a sheet metal pulley, the
web of which is secured to the hub in accordance with my invention.
A, is the rim of the pulley, B, the web and, C, the hub.
The hub, C, is provided with a flange, C, which is preferably provided with
bosses, c', through which a hole, c³, is made. c³, is the tapered portion of the hole,
b, is the tapered or conical boss formed up out of the web, B, and provided with a
hole at the inner end. The boss, b, corresponds in taper to that of the tapered
portion, 3, of the hole, c².
D, is a flat annular plate formed of metal and having open-ended tapered
bosses, d, formed up out of it and corresponding in shape and position to the tapered
bosses, b, of the web, B.
The hub, C, is turned back at, c, upon the inner edge of the annular flat plate, D,
so as to more securely hold it in position.
E, is a rivet provided with a conical or tapered head, e, corresponding to the
tapers of the bosses, b, and, d. The rivet, E, extends through the bosses d, and, b,
and, hole, 2, of the boss, C, and is secured at the inner end in the usual manner by
being flattened out as indicated in the drawing.
It will be seen from the construction of the bosses, b, and the tapered portion, c³,
of the hole, c, as described that the bosses, b, will afford a much better and more
extensive surface upon which the head of the rivet may grip than an ordinary hole
made through the web, B, and thus effectually prevent any possibility of the holes
becoming enlarged and the web becoming loosely connected to the hub if ordinary
holes were made through the web and flange.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, 1 declare that what I
claim is :-
--
1. In a sheet-metal pulley, the combination with the web having tapered open
ended bosses formed up out of it near the centre, of the hub provided with an
annular outwardly extending flange having tapered openings corresponding in shape
and position to the tapered bosses of the web and rivets provided with a head
corresponding to the taper of the bosses and passing through the tapered bosses of
the web and tapered opening of the flange as, and for the purpose, specified.
2. The combination with the web B having the tapered bosses & formed up in it
as specified, of the hub C provided with a flange C¹ having bosses c¹, with holes, c²,

page_text: having tapered outer ends, c³, corresponding to the tapers of the bosses, b, and, the
rivet, E, provided with a tapered head, e, and designed to secure the parts together,
as shown and for the purpose specified.
3. The combination with the web, B, having the tapered bosses, b, formed up in
it as specified, of the hub, C, provided with a flange, C', having bosses, c¹, with
holes, c, having a tapered outer end, c³, corresponding to the taper of the bosses, b,
and the annular metal plate, D, also having corresponding tapered openings, d,
and the rivet, E, provided with a tapered head, e, and designed to secure the parts
together, as shown and for the purpose specified.
4. The combination with the web, B, having tapered bosses, b, formed up in it as
specified, of the hub, C, provided with a flange, C, having correspondingly tapered
holes, c, and the annular metal plate provided with tapered openings, d, and the
rivets, E, having tapered heads and securing the parts together, the hub, C, being
provided with an annular lip, c, which extends over the inner edge of the annular
metal plate, D, as and for the purpose specified.
Dated this 15th day of August 1894.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.