Improvements in Pulleys.
Year: 1897

page_text: Date of Application, 12th Jan., 1897-Accepted, 6th Mar., 1997
Improvements in Pulleys.
I, THOMAS CORSCADEN of No. 52 Vine Street, City of New Britain, County of
Hartford, and State of Connecticut, U.S.A. Travelling Salesman for the Stanley
Works, 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 pulleys and the objects of my
improvements are simplicity and economy in construction and general efficiency of
the pulley.
In the accompanying drawing-
Figure 1 is a side elevation of my pulley with a small portion of the hub in
section.
Figure 2 is a sectional view of one half of my pulley on the line x x of Fig. 1
looking to the right.
Figure 3 is an enlarged sectional view of a portion of said wheel on the line y y
of Fig. 1 looking downwardly.
Figure 4 is a plan view of the blank for one of the bolt lugs for the rim.
Figure 5 is a plan view of a portion of my wheel hub and two bolt lugs for said:
hub with a bolt in the right hand lug.
Figure 6 is a plan view of the blank from which the hub bolt lugs are made.
Figure 7 is a plan view of a blank from which the epoke arms and their
connecting web are formed.
Figure 8 is a plan view from which the hub shells are formed.
In the preferred form I make the rim or half rim A of two strips of metal with
a flange 12 at one edge and a bead or roll 13 at the opposite edge while said strips
are curved to conform to the desired circumference of. the pulley. These two
strips are placed side by side with their flanges 12 abutting against each other so
that the rolls 13 come on opposite edges of the completed rim or half rim.
Although the strips are curved slightly as shown, they have on their outer side a
somewhat flattened face that is to say, a face which is specially adapted to a flat
belt in contradistinction to a grooved face for a cord or round belt. I also leave.
the outer corners of each piece at the junction with the abutting flanges 12 slightly
rounded as shown, whereby a circumferential groove is formed at the middle
portion of the rim, and for its entire circumference, which will always permit the
air under the belt to escape, as the belt never wholly encircles the pulley. The
flanges form a strengthening rib immediately inside the groove, so that forming
the groove at this point does not in any way weaken the pulley rim. I prefer to
divide the half rims by one edge of the spoke on one side and by the opposite edge
of another spoke on the opposite side, for example' I divide the rim on a line with
the upper edge of the spoke B on the right hand side of Fig. 1, and on a line with
the lower edge of the spoke C on the left hand side of Fig. 1 but the seam or joint
between the two half rims may if desired be at a point about midway between two
spokes. The two flanges 12 in the completed rim or half rim form a central
inwardly projecting strengthening rib which also serves as a spoke attaching rib
and means for connecting the rim bolt lugs.
The hub shells 14 are formed into semicylindrical form from blanks like Fig. 8,
in which the width from side to side represents the length of the hub. The spoke
arms 15 and their semicylindrical connecting webs 16 are formed from the blank

page_text: Fig. 7, by rolling the flat connecting web 16 Fig. 7, into the semicylindrical form
of Figs. 1, 2 and 5 while the spoke arms are bent at an angle thereto so as to
radiate from said web. The difference in the vertical width of the blanks Figs. 7
and 8 is such as to be equalized when said blauks are formed up and the hub shells
placed inside of the connecting webs as shown in Figs. 1 and 2. This forming up
will also make the lug mortises or holes in said blanks register with each other
when formed. As a sort of preliminary fastening for convenience in assembling,
I first secure each connecting web 16 in position on the hub shells 14 by means of
a rivet, as at 17 Fig. 1 and 2. The spoke arms if desired may be strengthened by
any suitable beads or corrugations. The spoke arms are of the proper length to
abut against the inner surface of the pulley rim, and their outer ends are secured
to the central rib by rivets or screws as at 18, on the spoke arms in Fig. 1.
I form the hub bolt lugs 19 from blanks like Fig. 6, by bending the same along
the vertical middle portion into a U shape, while the narrow slit ends 20 are bent
around and meet thus forming a short tubular portion 21 at the outer end of each
lug but said tubular portion may be omitted and the bolt head or nut or a washer
under them rest directly on the U shaped end of said lug. The curved edges 22
of said blank in the formed up hub bolt lugs fit the periphery of the connecting
webs 16 as shown in Fig. 1 wbile the wings 23 serve as lugs or tenons which
passing through the holes in the connecting web and into the holes in the hub
shells inside said web as shown at the portion sectioned in Fig. 1, may be riveted or
headed down to firmly secure said hub bolt lugs in place and at the same time
fasten together said hub shells and connecting webs. Bolts 24 are passed through
the hub.bolt lugs as in other two part pulleys.
The rim bolt lugs 28 are formed from blanks like that shown in Fig. 4, the same
being bent along its middle vertical line into a partial tubular form with the broad
sides of its ends lying parallel and open sufficiently to receive the two flanges 12
that form the central inner rib of the pulley rim, as best shown in Fig. 3, when it
is secured to said rib by rivets 180. The wings 25 are merely to make room for
more rivets than could be used if said wings were omitted. In the spoke arms
adjacent to the rim bolt lugs I form transverse swells or bolt sockets 26 Fig. 1,
the space between which substantially coincides with the hole through the said lugs
so that the rim bolts 27 passing through said lugs and between the adjacent spoke
arms serve to firmly secure the abutting ends of the two half rims together. In
case however the dividing line of the half rims should be in the middle of the space
between two spokes, as herein before suggested then it is only necessary to put a
rim bolt lug like the lug 28 at each end of each half rim. The rivets by which the
rim and spoke arms are secured together and the rivets that secure the rim bolt
lugs serve also to fasten together the two parts of each rim, or half rim, but if
desired additional rivets may be inserted through the two flanges 12.
While I have described the best construction known to me of the several parts,
I wish it distinctly understood that I do not limit myself to the particular details
of construction thus described, but I intend to claim all such variations as
mechanical skill and judgement may suggest as well as all changes that come fairly
within the spirit and scope of my invention, and it is evident that any desired
change may be made in any of the parts provided the same does not also materially
change the particular features relied on for novelty in any one claim.
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;
1. A pulley having a circumferentially divided rim with flattened face for a flat
belt, the parts of which rim meet in an inwardly projecting flange in the inside of
said rim and in a circumferential groove on the outer side of said rim, a hub and a
series of separate spoke arms radiating from said hub and having their outer ends
lapped upon and secured to the said inwardly projecting flange of the two part rim,
substantially as described and for the purpose specified.

page_text: 2. A divided pulley, having at one end of each half of the rim a spoke with a
transverse bolt socket 26 and at the other end of each half rim the rim bolt lug 28
which registers with said bolt socket, substantially as described and for the purpose
specified.
3. A divided pulley, the hub of which is provided with bolt lugs, the main body
of said lugs being Ŭ shape in cross section while the outer end of each lug is
provided with a short tubular portion 21, substantially as described and for the
purpose specified.
4. A pulley having a transversely divided and internally flanged rim, and rim
bolt lugs with the sockets of said lugs inside of said rim and with portions of each
lug embracing opposite sides of the central rib or flange to which said rim bolt
lugs are secured, substantially as described and for the purpose specified.
5. In a sheet metal pulley, a circumferentially divided internally flanged rim, in
combination with spokes whose hub terminals 16 encircle hub shells 14 and are
secured thereto, substantially as described.
In witness whereof I, the said Thomas Corscaden have hereunto set my hand
and seal, this 29th day of October, in the year of our Lord One thousand
eight hundred and ninety-six.
Witnesses :-
G. L. REYNOLDS.
C. G. REYNOLDS.
THOMAS CORSCADEN.
Boult & Wade,
Agents for the Applicant.