Improvements in Sheet Metal Pulleys.
Year: 1899

page_text: Date of Application, 19th Oct., 1899-Accepted, 25th Nov., 1899
COMPLETE SPECIFICATION.
Improvements in Sheet Metal Pulleys.
I, CHARLES A. BRINLEY, of No. 247, South Fifteenth Street, in the City and
County of Philadelphia, State of Pennsylvania, United States of America,
Engineer, 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:-
!
In the manufacture of sheet metal pulleys it has been customary to form
the rim of the pulley of four semi-circular sections arranged in pairs and
united to form a complete rim by suitable rim clamps. The adjacent semi-
circular edges of the rims forming half of the pulley were inwardly flanged
and riveted together, and the outer edges of said sections were curled over or
beaded to impart strength and finish. While this has been found entirely satis-
factory for pulleys of small sizes, it is expensive and not practicable when the
pulleys are to be of large diameters. The object of my invention is to pro-
vide a suitable construction for large sheet metal pulleys; and my improve-
ments are especially directed to the rim, which I form in more than four
sections, preferably twelve, and these sections are united by flanges, both cir-
cumferential and transverse, projecting inwardly. The spoke arms are riveted
or secured to the internal circumferential or annular flanges and preferably
intermediate of the transverse flanges. Furthermore, I prefer to reinforce or
bind the transverse.flanges with capping pieces firmly riveted thereto. By this
construction I am enabled to build up a sheet metal pulley to a very large
size and avoid the necessity of the extra reinforcing constructions at the
lateral and outer edges of the rim. Moreover, the pulley may be constructed
as a split pulley by using bolts in uniting the transverse flanges on one diameter
So far
of the rim to correspond with the line of division of the hub portion.
as my improvements are concerned, it is immaterial what the details of con-
struction of the hub and spokes and hub clamp may be, as these latter may
be varied to suit the particular work to be performed, but the construction shown
is excellently adapted to the purpose.
My invention will be better understood by reference to the drawings, in
which:-
Fig. 1 is a side elevation of the pulley embodying my improvements;
Fig. 2 is a sectional elevation of same on line 2-2;
Fig. 3 is a perspective view showing the juncture of the circumferential
and transverse flanges of the rim:
Fig. 4 is a perspective view of the transverse reinforcing cap;
Fig. 5 is a transverse section on line 5-5 of Figure 1; and
Fig. 6 is a plan view of the sheet before being bent into the form of a
section.
A is the rim of the pulley and is connected to the outer ends of the radial
spoke arms B, the inner ends of which are connected to the semi-circular hub
portions riveted or otherwise secured to the semi-circular hub shells C. The
hub portions are further provided with suitable clamps D through which
clamping bolts & pass so that the two halves of the hub and spoke portions of
the wheel may be united and clamped upon the shaft or split bushing in the
well known manner. As shown in Fig. 2 the spoke arms and hub portions are
arranged in pairs, so that the outer ends of each pair of spoke arms receive

page_text: between them the circumferential or annular inner flange of the rim to which
the spoke arms are riveted at J.
The rim A consists of a series of sections E each forming a portion of the
whole circumference, preferably one-sixth thereof. These sections are arranged
in pairs, their adjacent edges being provided with circumferential flanges G
adapted to be secured together to form an annular flange within the rim and
located intermediate between the lateral edges, thus imparting the necessary
rigidity against inward crushing. The outer edges of these sections may be
left plain or without flanges, beads or any other special construction as is clearly
shown in Fig. 2. It is evident, however, that the outer edges may be beaded if so
desired. The ends of each of the sections in the direction of the circumference
or curvature of the rim is inwardly flanged as at F, so that the adjacent flanges
abut against each other. The sections of which the rim is built up are first
formed of sheets such as indicated in Fig. 6 with two of the ends notched out.
This sheet is then bent on the line S, so that the part G shall constitute the
annular flange, and the end parts F¹ are bent on transverse lines T-T to form
the end flanges F in the rim. In perfecting these flanges the proper circum-
ferential curvature is given to the sheet, and this curve is either the same
at both inner and outer edges or slightly different according as to whether the
rim of the wheel is to be flat faced or crowned. These flanges are firmly riveted
or bolted together, and the joint is preferably further strengthened by rein-
forcing U-shaped caps H which fit over the said flanges and through which the
flanges and the rivets f pass. In this manner great lateral rigidity is secured
for the outer edges of the rim. In the case of the juncture of the sections E
on the line where the pulley is to be divided to form a split pulley, bolts f¹ are
employed in place of rivets, so that the two sections of the wheel may readily
be separated when desired as in the case of split pulleys.
It is evident that, if desired, the capping pieces H may be like fish plates or
omitted; and it is also evident that said capping pieces need not extend across
the circumferential or annular flange G, though I prefer that they shall cross
said flange as indicated, since it enables the capping pieces to secure greater
rigidity to the rim.
It will be seen that the rim is composed of two circular rings arranged end
to end and bolted together through the annular flanges, and each ring is fur-
thermore composed of a series of circumferential sections.
The minor details of construction may be modified without departing from
the principles of my invention, and the hub and spokes may be constructed in
any suitable manner desired.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is:-
1. The sheet metal pulley when constructed substantially in the manner
described and as shown in the accompanying drawings.
2. In a sheet metal pulley of the character described:
(a) The sheet metal rim subdivided and flanged both circumferentially
and transversely and having the sections riveted or bolted together through
said flanges.
(b) The combination with the circumferentially and transversely sub-
divided and flanged rim of the transverse reinforcing pieces extending
across and secured to the transverse flanges of adjacent sections.
Dated this Sixth day of October 1800.
CHARLES A. BRINLEY.
Haseltine, Lake & Co.,
45, Southampton Buildings, London, W.C.,
Agents for the Applicant.