IMPROVEMENTS IN PULLEYS OR WHEELS
Year: 1885

page_text: I EDWIN POWLEY ALEXANDER of 36 Southampton Buildings in the County of
Middlesex, Fellow of the Institute of Patent Agents do hereby declare the nature
of the invention for "IMPROVEMENTS IN PULLEYS OR WHEELS" (communicated
to me from abroad by Joseph Lathrop of Chicago, Illinois, in the United States of
America Manufacturer) and in what manner the same is to be performed to be
|particularly described and ascertained in and by the following statement:-
This invention relates particularly to that class of pulleys or wheels wherein
thin veneers of wood suitably cemented together are employed to form the portions
of the pulleys intermediate between the hub and rim; and the object of this
invention is primarily to so construct the veneer body of a pulley or wheel that it
will with greater certainty resist strain and will be less liable to become warped or
loosened than pulleys made in accordance with present known constructions.
A further object of invention is to provide improved means for securely locking
together the halves of a split or separable pulley. To this end, the invention
consists in forming the body of a pulley or other wheel of separable discs made of
multiple wood veneers glued together with their grains crossed, said discs being
connected at a point intermediate between the hub and rim and from about such
point being flared outwardly to the rim, and preferably also to the hub. The
invention also consists in forming the body of a pulley of discs of multiple wood
veneers glued together and provided with brace-strips between said discs inter-
mediate between the hub and the rim. The invention further consists in providing
the body of the pulley or wheel with brace-strips placed between the veneer discs
at a point at or near the rim which shall serve not only to strengthen the body, but
also as a means for uniting the rim thereto. The invention further consists in
providing the half sections of a split pulley with half-rings, the ends of which shall
project in such manner as to aid in locking the sections of the pulley together.
The invention also consists in the combination with the divided sections of a split
pulley of clamping bolts having tie-plates extending across the joint of the pulley.
sections, said tie-plates being provided with downwardly bent ends which enter
suitable seats or depressions in the body of the pulley. The said invention further

page_text: consists, finally, in forming the metallic hubs of the pulleys with clamping flanges
having projections or ribs thereon adapted to bite into the surface of the wooden
discs and thus aid in securely holding the same in place.
.
· It will be readily understood that certain features of this invention although
illustrated as applied to a pulley, are equally applicable to the manufacture of
wheels of various kinds such as car-wheels, truck-wheels and the like; and the
word "pulley" where used in the description and claims is not therefore to be
regarded as a term of limitation. So, also, it will be apparent that, although the
invention is shown as embodied in a split pulley, it is equally applicable to simple
or unsplit pulleys, and for such reason the term "disc" as hereinafter employed is
designed to include the veneer discs, whether the same be divided as shown or
formed each in a single piece.
Figure 1 of the accompanying drawings is a view in side elevation of a pulley
embodying this invention, a portion being broken away for illustration of subjacent
parts. Figure 2 is a view in central section on line X-X of Figure 1. Figure 3
is a fractional view in vertical transverse section through the centre of the hub.
Figure 4 is a detail view of a tie bolt and plates for uniting the sections of the
pulley.
A designates the, cast metal hub of the pulley, which for split pulleys will be
formed as shown of semi-cylindrical sections having lugs or flanges a, to receive the
belts a¹, by which the sections of the hub will be firmly held together, Upon the
periphery of each section of the hub are formed the flanges A¹, provided with
suitable V shaped projections or ribs a¹ on their inner faces to bite into the veneer
discs and more securely guard the same against becoming loose, In the flanges A¹
suitable holes are formed to admit the bolts A' which pass through the discs B and
the clamping half rings C (Figure 3) and are provided at their threaded ends with
nuts a. From this construction it will be seen that when the discs are fitted in
place between the flanges A¹ and rings C the tightening of the bolts A³ will serve
to firmly clamp the discs to the flanges, at the same time causing the projections a
to so enter the surface of the wood as to aid in firmly guarding the discs against
any movement on the hub. The rings or half rings C are formed with projecting
ends as shown clearly in Figure 3 for locking the sections of the pulley.
The discs B are constructed of thin Lamine or veneers of wood glued or otherwise
cemented together with their grains crossed, and between the centre and periphery
of each disc an annular depression b is formed from which depression the disc is
flared outwardly towards its periphery and preferably also towards its centre.
Between the discs B at a point opposite the depression 6 will be placed the bracing-
strip or strips or rings E which it is preferred to form of veneers glued together
with their grains crossed; and to these strips or rings the discs will be firmly held
by means of the bolts or rivets e. At or near the periphery of the discs the
bracing-strips.or rings F will be placed and to these strips the discs will be securely
bolted by means of the bolts or rivets f. The rim G of the pulley is formed
preferably of wood veneers glued together and moulded to the proper shape and
this rim is connected to the body of the pulley by glue or other cement and also bý
bolts which pass through the rim and through the bracing-strips or rings F. The
two sections of the split pulley when placed in position upon the shaft are held
together not only by the bolts a¹ which pass through the sections of the hubs, but
also by means of the tie-bolts H and tie-plates H¹ the bolts H passing through
suitable openings at the joint of the sections and the bent ends -(figure 4) of the
tie-plates fitting into suitable seats formed in the surface of each of the sections.
The ends of the bolts H will be threaded and provided with clamp-nuts h¹ by which
the tie-plates will be securely held in their proper position.
From the foregoing construction it will be seen that by forming the discs in the
manner shown a broad bearing is obtained between the body and the rim and the
discs brace each other and thus more effectively resist the strain to which they will
be subjected. It will be seen that the bracing-strips or rings F not only serve to
strengthen the wooden discs but also afford a means whereby the rim may be
1

page_text: securely attached to the body of the pulley. The bracing strips or rings F serve
also to give increased strength to the body as well as to hold the discs at suitable
distances apart. It is preferred to flare the discs outwardly towards the hub in the
manner shown, as a broader and more secure bearing is thereby obtained; bot in
some cases, particularly where the pulley is of small diameter, this feature may be
omitted and the discs may be straight from the point of the depression b. So also
the bracing-strips or rings F may be omitted without departing from the scope of
the invention the discs in such case being flared considerably towards both the rim
and the hub. The construction shown is, however regarded as the preferable one.
In lieu of the continuous veneer rim said rim may be made in solid sections or
blocks cut on radial bevel and interlocked together, by dove-tail or like joint formed
in the contiguous bearing faces of the sections.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed I declare that what
I claim is
1. A pulley or wheel comprising a metallic hub, a rim, and a body consisting
essentially of separate discs formed of multiple wood veneers glued together with
their grains crossed said discs extending each from the hub to the rim and being
connected together at a point between the rim and the hub and from such point
being flared outwardly substantially as described.
2. A pulley or wheel comprising a metallic hub, a rim, and a body consisting
essentially of two separate discs formed of multiple wood veneers glued together
with their grains crossed said discs being connected together at a point between the
rim and the hub and from such point being flared outwardly to both the hub and
the rim substantially as described.
3. A disc for forming the body of a pulley or wheel having a central opening to
receive the wheel hub and having an annular depression substantially as shown
between its centre and periphery substantially as described.
4: A pulley comprising a metallic hub, a rim, a body consisting of discs of
multiple wood veneers glued or cemented together and brace strips or rings E
between the said discs intermediate between the hub and rim substantially as
described.
5. A pulley or wheel comprising a hub, a rim, and a body consisting of two discs
of multiple wood veneers glued or cemented together and having bracing-strips or
rings F at the rim substantially as described.
6. The combination with a split pulley comprising a metallic flanged hub, a rim,
and a body formed of separate divided discs of the half rings C having projecting
enda for locking the sections of the pulley substantially as described.
7. In a split pulley the combination with the two main sections of the bolts H
and the tie plates H¹ extending across the joint of the pulley sections substantially
as described.
8. In a pulley the combination with the wood veneer discs of the metallic hub
aving flanges A¹ with projections as on the inner faces thereof substantially as
described.
EDWIN P. ALEXANDER,
Fel. Inst. P.A.