Improvements in and relating to Hoisting Mechanism.
Year: 1896

page_text: Date of Application, 14th Apr., 1896-Accepted, 20th June, 1896
COMPLETE SPECIFICATION.
Improvements in and relating to Hoisting Mechanism.
A communication from abroad by PATRICK EGAN, a citizen of the United States
of America, of-68 and 70 Nassau Street (Sheldon Building), in the City,
County, and State of New York, one of the United States of America,
Gentleman.
I, PETER JENSEN, of No. 77 Chancery Lane, London Chartered Patent Agent,
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 present invention relates to an improved hoisting mechanism for raising and
lowering weights of various kinds.
The invention has for its object the adaptation of a new and improved form of
reduction gearing for use in this connection, so that the high speed of the driving
shaft, which may be the armature-shaft of an electric-motor or some other high-
speed prime-mover, may be reduced to a lower speed in the hoisting drum when
rotating at a given ratio, the same depending upon the proportions of the different
gears and their relation and combination relatively to each other. The invention,
therefore, consists essentially in the construction, arrangement and combination of
parts, substantially as will be hereinafter described and claimed.
Referring to the accompanying drawings, I have illustrated therein one preferred
embodiment of my invention, the same being sufficient to explain the principles
thereof and enable those skilled in the art to make and use the invention, and it
will be understood that the details of construction and arrangement of parts may be
varied to suit the exigencies of any particular case, and that parts of my invention
may be used separately or in combination, or in combination with other equivalent
parts without departing from the spirit of my invention.
In the drawings, therefore-
Figure 1 is a longitudinal sectional view of my improved hoisting mechanism.
Figure 2 is a cross sectional view on the line -x of Figure 1, and showing the
relative arrangement of the various gear wheels.
Figure 3 is a left hand elevation showing the arrangement of the brake levers
and other parts of the brake mechanism.
Similar letters of reference designate corresponding parts throughout the
different figures of the drawings.
A and B denote two separate standards mounted upon some suitable bed or
platform and having their upper ends formed with the horizontal shaft bearings a
and respectively, which bearings are in horizontal alignment with each
other.
C indicates a horizontal drun on which is wound a suitable rope or cable adapted
for hoisting purposes. This drum is provided on one 'side, as for instance, the right
hand side, as shown in Figure 1, with a central, integral, horizontal trunnion or
journal e that is supported in the bearing a and is arranged to rotate in said bearing.
To the opposite side of the drum C is attached a wheel F, which is outside the
flange of the drum, and is formed integral with a sleeve-like trunnion or journal f
that is supported and revolves within the bearing b.
Another wheel G, similar to wheel F, and having the same diameter, is situated
close to the end of the bearing b opposite to where the wheel F is located, and
wheel G is made integral with or is securely attached to horizontal shaft g which

page_text: passes through and is supported revolvably within the hollow trunnion or journal
before mentioned, the opposite end of shaft g being within the drum C and having
formed integral with it a wheel I which lies alongside of the wheel F. It will be
evident that as wheel is against the wheel F and the latter is against one end of
the bearing b, while the wheel G is close against the other end of said bearing b,
and likewise close against the end of the hollow trunnion, which is integral with
the wheel F, these parts will all work nicely together without becoming dissociated,
such intimate relation and correct werking of the several mechanical parts being
quite essential and necessary to the true performance of the proper function of the
hoisting mechanism, as resulting from the action of the gearing which is located
inside of the hoisting drum C and which is presently to be explained. The wheel I
is either formed with gear teeth or else a gear tooth rim like L is secured thereto,
as shown in Fig. 1, so that an external gear may thus be provided, situated within
the drum C and integral, as it were, with the wheel G, inasmuch as it is integral
with the shaft to which the wheel G is fastened, and hence any movement of the
gear wheel L will be transmitted simultaneously to the wheel G, and reversely, any
stoppage of the wheel G will simultaneously cause the wheel L to be brought to a
standstill.
The driving shaft D is a shaft which is adapted for rotation by any suitable kind
of motor. It may be the armature-shaft of an electric motor, and it may be any
other kind of high speed shaft. This shaft D is supported in the journal e and the
drum C and passes through the drum and into the tubular recess g' in the shaft g.
Said recess may pass partially or entirely through the shaft g. The recess g
therefore, serves as a bearing for the end of the drive shaft D. On the shaft Dis
an eccentric E which is located centrally within the drum C. On this eccentric is
a combined external and internal gear wheel, consisting of the web H, on one side
of which is the internal gear rim land on the other side of which is the external
gear rim J, said internal gear I meshing with the external gear wheel L already
referred to, and said external gear meshing with the internal gear wheel K,
which is attached to and forms a part of the drum C. The combined external and
internal gear wheel is mounted upon and driven by the eccentric E. It will thus
be seen that the several gear wheels just mentioned are enclosed entirely within
and protected by the drum C. The combined external and internal gear wheel,
although eccentric to the axis of revolution of the shaft D is concentric with the
eccentric E. On the shaft D, preferably at a point close to the eccentric H,
although it may be situated at any other desired point, I place a balance or balance
wheel M which is securely fixed on the shaft. This balance is of great importance
in making the movement of the gearing steady and uniform and avoiding irregu-
larities and jerks, which strain and damage the machinery, and it is especially valuable
when the gearing is employed with a high-speed prime-inover, such as, for instance,
an electric motor.
To each of the wheels F and G, which wheels for the sake of simplicity I
denominate brake wheels is applied to some suitable form of brake strap, like that
shown at O in Figure 3, and having one end attached at the point o to lever P
while the other end is attached at the point o' to the end of the brake lever P.
Hence the operator, by laying hold of the brake lever and by drawing the same
toward himself, can tighten the strap upon the periphery of the wheel F, or the
wheel G, as the case may be, and thereby brake and stop the wheel. Of course it
is evident that I will have a brake strap and also an operating lever for each of the
wheels F and G. I do not intend to be restricted to any precise form of strap, or
any particular kind of operating lever, but reserve the liberty of employing such
forms as may be deemed most suitable.
The operation of my improved hoisting mechanism is as follows:-
Suppose, for instance, that the brake is applied to the wheel and said wheel is
consequently caused to remain stationary, then likewise the gear wheel L will
remain stationary. Now as the shaft D rapidly revolves, power will be com-
municated through the eccentric, the combined external and internal gear wheel

page_text: revolving loosely upon and driven by the eccentric, and the gear wheels Land K
with which the combined external and internal gear wheel engages, to the drum C,.
and said drum will consequently revolve at a rate of speed reduced below the speed
of the shaft and in a direction of motion opposite to that in which the shaft D is
revolving, and evidently the wheel F which is attached to the drum C will partake
of the same reduced and reversed movement. The gearing, therefore, which I bave
combined with the hoisting drum, enables me to gain a very important and marked
advantage in the use of the drum, because it permits said drum to be effectively used
in combination with a high-speed prime-mover, a result which heretofore has been.
impossible, owing to the absence of any efficient gearing arrangement for reducing
the rate of-movement of the-prime-mover to the rate at which the drum ought
properly to revolve in the performance of its hoisting functions. If now, we apply
the brake to the wheel F and release the brake from the wheel G, the result will
be that the drum C will be held stationary, which will consequently cause the
internal gear K which is carried by said drum to likewise remain stationary, and.
as the shaft D revolves as before, the result will be to communicate the reduced
rate of motion through the aforesaid gearing already described to the gear wheel L,.
the shaft g and the wheel G.
In the carrying of my invention into practical effect along the line indicated it
becomes quite essential that the relative arrangement of the various mechanical
parts, consisting of the drum, the wheels, the gearing, the drive shaft, and the-
various bearings, should not vary materially from what I have herein illustrated
and described, because in the present collocation of mechanical parts resides the-
effective combination which enables me to produce the enhanced and valuable.
result which I have herein described as pertaining to a hoisting drum as the
outcome of my invention. Therefore, although the present example of the
invention is merely one embodiment, yet it is essential that in the practical use-
thereof there should not be an extreme variation from the legitimate scope of the
claims to be herein appended.
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. In a hoisting mechanism, the combination of a hoisting drum having on one
side a central horizontal journal, a brake wheel on said drum, said brake wheel
also having a horizontal sleeve-like journal located oppositely to the first-mentioned.
journal, the bearings supporting the said journals, the same being in horizontal
alignment with each other, a second brake wheel, a shaft which is supported
within the sleeve-like journal, and to which said second brake wheel is attached,.
a gear wheel on said shaft within the drum, a drive shaft which revolves within the
aforesaid shaft and also within the drum journal, an eccentric on said drive shaft,.
and a gearing connection between said eccentric and the drum and the afore--
mentioned gear wheel, substantially as described.
2. In a hoisting mechanism, the combination of a hoisting drum having on one
side a central horizontal journal, a brake wheel on the drum, said brake wheel also
having a horizontal sleeve-like journal, bearings for the two journals located in.
borizontal alignment with each other, a second brake wheel, a shaft located within
the sleeve-like journal of the first brake wheel to which shaft the second brake
wheel is attached, an external gear wheel on said shaft within the drum, a drive
shaft supported in the drum journal and also in a recess in the aforesaid gear-.
carrying shaft, an internal gear wheel on the inside of the drum, an eccentric on
the drive shaft, a combined external and internal gear wheel revolving loosely
upon and driven by the eccentric, and respectively engaging the external gear
attached to the gear-carrying shaft, and the internal gear carried on the interior of
be drum, and suitable brake mechanism operating in connection with the two-
brake wheels, substantially as described.
3. In a hoisting mechanism, the combination of a drum having a central.

page_text: horizontal journal, a brake wheel attached to the drum, which brake wheel has
also a sleeve-like horizontal journal, bearings supporting the said journals in
alignment with each other, a second brake wheel, a shaft that revolves within the
sleeve-like journal and carries said second brake wheel, an external gear wheel on
said shaft and within the drum, said shaft having a recess extending through or
partially through it, a drive shaft supported within the drum journal and the gear-
carrying shaft, an eccentric on said drive shaft within the drum, a combined
external and internal gear wheel revolving upon said eccentric and engaging the
gear on the gear-carrying shaft, and an internal gear on the drum engaging the
said combined gear wheel, brake mechanism operating independently for either of
the brake wheels, all arranged so that the rate of rotation of the drum may be
reduced below that of a high-speed drive shaft, substantially as described.
4. In a hoisting mechanism, the combination of a revolving drum having hollow
journals on each side, bearings supporting said journals, a shaft supported and
revolving within the hollow journals of the drum, an eccentric on said shaft, a
combined external-and-internal-gear wheel revolving upon and driven by the
eccentric, and the external and internal gear wheels engaging the combined gear
wheel, one of which gear wheels is on the drum and the other of which is on a
shaft supported in one of the drum journals.
Dated this 14th day of April 1806
JENSEN & SON,
77, Chancery Lane, London, W.C., Patent Agents.