Improvements in Sheet Metal Pulleys.
Year: 1897

page_text: Date of Application, 12th Jan., 1897-Accepted, 20th Feb., 1897
Improvements in Sheet Metal Pulleys.
THOMAS CORSCADEN of No. 52 Vine Street, City of New Britain, County of
Hartford, and State of Connecticut, U.S.A. Traveling 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 sheet metal belt pulleys and the
objects of my improvements are simplicity and economy in construction and
general efficiency in.use.
In the accompanying drawing-
Figure 1 is a side elevation of the main part of one of my pulleys, a portion of
the rim being shown in section.
Figure 2 is a vertical section of one balf of my pulley on the line x x of
Fig. 1.
Figure 3 is a plan view (supposing the pulley to be in the position shown in
Fig. 1) of the hub portion of my pulley with the spoke arms represented as broken
off and the clamp bolts removed from one end of the hub.
Figure 4 is a side elevation of the same together with a portion of the rim of
the pulley behind the hub.
Figure 5 is an end view of a portion of one part of my pulley showing the rim
bolt lug and adjacent portion of the rim.
Figure 6 is a plan view of the blank from which the rim bolt lugs are
formed, and
Figure 7 is a central vertical section of half of one of my pulleys in a somewhat
modified form.
The
I form the circumferentially. divided rim A of my pulley of two or more parts
of sheet metal, having a rolled bead 8 at each outer edge of the rim and each rim
part having an inwardly turned flange 9 at the meeting edges in the middle
portion of the rim. The said rim also divided transversely making what is
known as a divided or two part pulley. The spoke arms 10 preferably have hub
terminals 11 which stand at nearly right angles to said arms and are permanently
secured in any proper manner to the hub shells. 12. I have shown in the upper
half of the hub Fig. 1 the hub terminals of three adjoining spoke arms as formed
in one piece, but it is evident that each spoke arm might have its individual hub
terminal if desired, or in other words the hub terminal for three spokes may be
divided into three parts as shown in the lower half of the hub in Fig. 1.
rivets 13 by which parts of the hub terminals are permanently secured to the hub
shells are shown in Figs..2 and 7 and are indicated by broken lines in Fig. 1, while
the longer and shouldered rivets 14 secure the other spoke arms in Figs. 1, 2
and 3. The outer ends of the spoke arms may be connected to the rim flanges in
any proper manner as for example by the rivets 15 while other rivets 16, if
desired may additionally secure together two abutting rim flanges. I prefer to
insert dowel pins 17 in the hollow of the beads 8 at the outer edge of the rim as
shown in Figs. 2 and 7, and in putting the two parts of the pulley together_let
said pins enter the opposing hollow bead which serves as a dowel socket. The
meeting edges of the two parts of the rim are also provided with rim bolt lugs 18,
secured to the flanges 9 as shown in Figs. 1 and 5. The said rim bolt lugs I form

page_text: from blanks like that shown in plan view Fig. 6, which blanks are doubled upor
themselves forming a bolt eye at the bend. In addition to this eye, each lug is
provided at the edge which faces the companion lug with a tongue 20 and recess
or notch 21, see Figs. 1, 5 and 6, whereby as the two parts of the pulley are put
together, the tongues 20 enter the notches 21 after the inanner of a dowel pin and
socket for bringing the middle portion of the abutting edges of the rim properly
together, while the dowel pins 17 in the rolled beads bring the abutting edges
properly together at the outer edge of the rim, the parts of the rim are ther
firmly held in place by the rim bolts 22.
I hold the permanently attached hub shells firmly together and bind the hub
portion of the pulley upon the shaft by means of the clamps 19 and clamp bolt 23.
In Figs. 3 and 4 I have omitted the clamp bolts at one end of the hub in order to
better show the clamps. The said clamps embrace the hub terminals as well as
the hub shells, and they are formed from sheet metal doubled upon itself by
two bends near the middle but without bringing the side plates closely together,
whereby said clamps have the form of a flattened U in end view, or in cross
section the two sides being separated sufficiently to let the bolts pass between
them. The metal which connects the said sides forms a bolt seat which is
perforated at the proper points to receive the clamp bolts. I make said clamps
long enough to extend across the ends of the hub while the clamp bolts may pass
down by the sides of the hub as best shown in Fig. 1 and I form the metal at the
inner edge of said clamps on a circle which substantially fits the periphery of the
hub on the outer surface of the hub terminal. With clamps thus formed to span
the hub, it is not necessary that they should be secured to the hub shell in any
way except by the clamp bolts, and in such case the central hub terminal on each
half of the pulley may be secured to the hub shell by a short rivet as shown in
Fig. 7, and in any event it is best that the hub clamps shall not be rigidly secured
in place. In order to insure having the clamps always at hand, I prefer to employ
some means which shall so attach them to the hub as to prevent accidental
misplacement during transportation &c. For this purpose I have shown the
longer rivets 14 which have a shoulder formed by the flange 24 between their
ends whereby said rivets may be first inserted through the hub terminals and hub
shells and headed down on the inside of said shells. The clamp may then be
slipped on over the outer ends of said rivet upon the hub terminals and said outer
end then headed down by means of any proper set or otherwise. When so riveted
the clamps are yieldingly attached to the hub shell as the rivets are of a length
and size to yield a little to accommodate any inequality that there may be in
tightening up the bolts at the opposite ends of the clamps. If the clamps were
absolutely rigid with the hub, then, when the bolt at one end of the clamp was
screwed down harder than the bolt at the opposite end there might be a little twist
given to the hub so as to throw the pulley out of true, but when the clamps are
yieldingly attached to the hub, or not secured at all except by the clamp bolts,
there is no liability of making the pulley untrue by the act of unevenly tightening
the bolts.
The half pulley shown in Figure 7 is of the same general construction and
adapted for the same kind of clamps. If desired the Hanged rivet 14 may be
substituted for the middle one of the short rivets 13, and thereby have the clamps
attached to the hub. The pulley however is of a construction especially adapted
for a wider belt and therefore I have made the rim in three parts instead of two,
the two outer parts having the same rolled bead at their outer edges and the same
flanges 9 at their inner edges. The middle portion 25 of the rim has the flange
at each edge, and the two abutting flanges are united the same as in the con-
struction first described. The single spoke arms are also the same as before
described and I may employ one set of single arms secured to the outer ends of
the hub shells and the compound flanges as indicated in full lines, or I may
employ in connection with the spoke arms shown in full lines, other spoke arms as
indicated by the broken lines, thereby form two sets of compound spoke arms.

page_text: 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 divided hub, a sheet metal rim having the rolled over
edges and the inwardly turned flanges, separate spoke arms projecting from said
hub and having their outer ends mechanically secured to said flanges, dowel pins
in said rolled over edge, rim bolt lugs secured to and projecting inside of said
inwardly turned flanges and opposing tougues and recesses in the abutting edges of
said rim bolt lugs, substantially as described and for the purpose specified.
2. A pulley having a divided hub, spoke arms and rim, and also having rim
bolt lugs extending radially inwards from the said rim with registering tongues.
and recesses in the meeting radial edges of said rin bolt lugs, substantially as.
described and for the purpose specified.
3. A transversely divided or two part pulley, having permanently secured hub
shells, the hub clamps formed of sheet metal doubled upon itself by two bends.
near the middle in the form of a flattened U in end view, and of a length to spani
the end of the hub, the metal sides of said clamps being separated to let the
clamp bolts pass between them while the metal connecting said sides is per--
forated and serves as a bolt seat substantially as described and for the purpose
specified.
4. A transversely divided pulley having permanently secured hub shells and
baving hub clamps that span the ends of the hub, and means for yieldingly
attaching said clamps to said hub shells to prevent accidental displacement.
during transportation, but permitting them to yield and prevent throwing the
pulley out of true in tightening up, substantially as described and for the purpose
specified.
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.
Witnesses
G. L. REYNOLDS.
C. G. REYNOLDS.
THOMAS CORSCADEN.
Boult and Wade,.
Agents for the Applicant.