Improvements in Differential Pulley Blocks and Hoists.
Year: 1892

page_text: Date of Application, 28th July, 1892
Complete Specification Left, 22nd Aug., 1892-Accepted 1st Oct., 1892
PROVISIONAL SPECIFICATION.
Improvements in Differential Pulley Blocks and Hoists.
1 WILLIAM THOMAS EADES, of 43 Claremont Road, Sparkbrook, in the City
of Birmingham, Engineer, do hereby declare the nature of this invention to be as
follows:-
This invention pertains to differential pulley blocks and hoists, having epicyclic
or epicyclidal trains or arrangements of whicels.
By my invention considerable economy in the manufacture of the said pulley
blocks or lifts is effected, without reducing the efficiency of working of the same.
In carrying out one form of my invention in connection with a pulley block, 1
make the frame of the same integral, or in one piece with an inside toothed annulus,
which forms a part, or a side, of the said framing, united at top and bottom
by cross bars or distance sleeves, with screw bolts directed and passing through
them.
Thus the framing, which is of an upright rectangular figure, has one side made
in the form of a wheel-frame, having teeth upon its inside periphery, and with
which teeth, the teeth of an excentrically moving inner toothed wheel engage.
This said inner toothed wheel, which is excentric in its movement, is mounted
upon a cam snug, or excentric boss, on the turning axis, whose end has fast upon it,
the pulley, so that by rotating the said pulley, the axis upon which it is mounted
rotates the excentric boss or cam, by means of which, the toothed edge of the inner
toothed wheel, turning with the bossed excentric or cam, is made to roll upon the
toothed periphery of the fixed annulus or ring frame, and as the said inner wheel,
has a less number of teeth, say twenty three, to twenty four of the fixed annulus or
wheel frame, the pulley makes twenty four rotations to one of the said inner wheel,
whose motion is transmitted to a lifting pulley, through the intervention of an
oscillating plate, or a plate having a combined reciprocating and rotary movement.
The oscillating plate is of a cruciform figure, and is carried upon the inner face
of the lifting wheel, and works within guides, or between studs. The guides or
studs embrace two of the opposite arms of the said cruciform plate, whilst studs on
the outer face of the inner toothed wheel, embrace the other two arms, so that as
the said inner toothed wheel makes an excentric movement around the inner
periphery of the fixed and toothed frame, the oscillating plate is made to slide to
and fro within its guides, hence the union or connection between the inside wheel,
and the lifting pulley, which work at the same rate as each other, by the coupling.
The pulley is provided with swinging guide arms, having guide eyes, at the two
opposite sides of the driving wheel, which has chain link depressions in its trough
periphery, alike unto that of the lifting pulley or wheel, which may be timed to
rotate once to twenty four of the said driving pulley.
By varying the ratio of the number of teeth of the inner wheel, with that of the
fixed frame annulus, other differential motion may be obtained.
OPERATION.
By rotating the driving pulley, the excentric boss or cam, made fast upon its
axis, turns with it the inner toothed wheel, which makes a planet movement, within
the fixed annulus, and with the teeth of the frame annulus acting as fulcra for the
rotary movement of the inner wheel, on the teeth of the latter coming or inter-
gearing with the teeth of the former, by which means, the said inner wheel is
rotated to the extent of one revolution to twenty four of the driving wheel.

page_text: The inner wheel's rotation turns with it the coupling pins or snugs upon its face,
which slide upon the coupling arms of the oscillating plate, and by the excentric
movement of the said wheel, the plate is reciprocated within its guides, and at the
same time rotated, and with it the lifting wheel, which travels at the same rate as
the inside wheel.
Thus it will be seen, that the lifting wheel is driven through the intervention or
medium of an oscillating plate, or a cruciform-shaped coupling, which is located
between the said lifting wheel, and the excentrically revolving inside wheel.
As a further form of my invention, the inside wheel is mounted upon twin
excentrics, which are geared so as to be driven simultaneously by the driving
wheel, the excentrics giving to the inside wheel a reciprocating excentric motion.
The teeth of the inside wheel gear with teeth formed on the inside periphery of
toothed wheel which is connected with the pulley, and which has studs to gear
with or carry the lifting chain wheel.
Dated this 27th day of July 1892.
WILLIAM THOMAS EADES,
By Henry Skerrett,
Agent for Applicant.
COMPLETE SPECIFICATION.
Improvements in Differential Pulley Blocks and Hoists.
1, WILLIAM THOMAS EADES, of 43 Claremont Road, Sparkbrook, in the City
of Birmingham, 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 :-
This invention pertains to differential pulley blocks, and hoists, having epicyclic
or epicycloidal trains or arrangements of wheels.
By my invention considerable economy in the manufacture of the said pulley
blocks or lifts is effected, without reducing the efficiency of the working of them,
whilst a considerable mechanical advantage is obtained.
Figure 1 of the accompanying drawings, represents in vertical section, a
differential pulley block, having epicycloidal trains of wheels, and constructed
arranged and fitted according to my invention.
Figure 2 represents a transverse vertical section of the said differential pulley
block upon the dotted lines A. B. Figure 1, looking from right to left, or towards
the toothed annulus and inside working toothed wheel, as hereinafter referred to.
Figure 3 represents an elevation of the transmitting coupling, with the lifting
pulley and its guides in connection with it.
a is an upright rectangular-shaped frame, consisting of sides or cheeks a³, a³, the
latter made integral or in one piece with an inside toothed annulus a', with which
the teeth of an excentrically moving inner toothed wheel b, mounted upon a cam or
excentric boss €, made fast with a driving pulley d, turning freely upon an axis or
carried by the fixed framing a, engage.
shaft
e,
The head or upper part of the said framing is bolted together by a cross distance
block a', with necks a³, whilst the block is suspended by a hook a³.
The lower parts or sides of the framing are united by a distance sleeve a², and a
bolt a³.
Situated between the sides of the upright frame, and made fast to an enlarged
ende, of the axis e, is a lifting pulley f, with chain g, passing around its link
recessed periphery.
Disposed between the lifting wheel f, and inner wheel b, and turning loosely upon
the axis e, is cruciform-shaped transmitting coupling h, working and located
between driving suugs, carried by and on the outer face of the excentrically
moving toothed wheel, and driven snugs 2, carried by and on the inner face of

page_text: By rotating the driving pulley, the excentric boss is rotated, which gives unto
the inner toothed wheel a planetary movement within the sinking of the fixed annulus,
and with the teeth of the last named acting as fulcra, for giving the rotary
movement of the teeth of the inner wheel, as the same is made to travel in the
excentric or planetary course as indicated.
By this means, the said inner wheel is rotated in one whole traverse of the teeth
of the annulus to the extent of one tooth, or to one-twenty-fourth of the number of
the teeth of the fixed wheel, or to one-twenty-fourth part of the motion made by
the driving wheel.
This reduced speed is communicated to the transmitting coupling or communicator,
by the snugs or studs on the inner toothed wheel, and from the coupling to the
lifting wheel through the snugs or lugs on its face.
Figure 4 represents a vertical section of a differential pulley block, with the
head part removed, and constructed and arranged according to a further form of
my invention.
In this arrangement like as in the last, epicycloidal trains of wheels
are employed, but instead of the toothed annulus being made a part of the framing,
it is made integral or in one piece with the chain lifting wheel, whilst motion is
communicated to the inside toothed wheel, which has no rotatory movement, but
only a reciprocating excentric one, by excentric pins, passing through bossed
pinions, whose bosses rotate within fixed bearings of one of the side frames, whilst
the pinions themselves intergear with a pinion made fast with the driving pulley
which turns freely upon the axis, likewise does the lifting wheel and toothed
annulus, after notion has been communicated to them through the means
described.
as
Figure 5 represents a vertical section upon the dotted lines C. D. Figure 4,
looking from left to right, showing the pinions of the excentric bosses, which turn
loosely upon pins or centres.
Figure 6 is a vertical section upon the dotted lines E. F. looking from left to
right.
In Figures 4, 5, and 6, a is an upright rectangular framing, with side plates or
cheeks a, a; b is an inside toothed wheel, gapped at its middle at 2, and mounted
upon pin excentrics, whose plain and fore parts it, freely pass through and turn

page_text: within excentrically disposed bearings, of bossed pinions 2, 2, while the bosses
themselves work within fixed bearings a³, made through the side aº, of the frame a.
The pinions, 2., gear with the teeth of a driving pulley pinion d², of a
driving pulley d, which with its pinion, rides loosely upon the axis e.
Located within the middle of the frame, which is united at head and bottom by
cross sleeves or distance pieces, and screw bolts or nuts and other adjuncts, is a
lifting chain wheel, made in one piece with the toothed annulus a', with which the
teeth of the reciprocating and excentric moving toothed wheel, engage.
ACTION.
By communicating motion to the driving pulley, its pinions gear with the twin
pinions with the bosses or necks i, turning concentrically within the fixed
bearing, and as the said pinions rotate, so the excentric pins, are carried around
with them, and communicate a reciprocating excentric motion, otherwise an
elliptical one to the inner wheel b, and by such motion, the teeth thereof are
presented consecutively into gear with the teeth of the annulus, on the said inner
wheel's elliptical traverse, and overlap to the extent of one twenty-third of a tooth,
so that on the said teeth going fully into gear, the teeth of the one act as wedges
or inclined planes upon the teeth of the other, hence the communication of motion
to the annulus, and to the lifting wheel in the ratio of one to twenty-four rotations
of the driving wheel, and with the said annulus and lifting wheel moving in a
reverse direction to that of the path made by the teeth of the inner wheel.
In the arrangements Figures 1, 2 and 3, the excentric may be fast on, or formed
in one piece with the axis e, and which is driven by the driving pulley, which also
may be keyed to the said axis.
The application of my invention to hoists and lifts, differs in no essential respect
from its application to a pulley block, as herein described.
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 :—
First In epicycloidal differential pulley blocks, the combination with a fixed,
or a fixed and frame annulus, of excentric and rotating, otherwise an elliptical and
rotating inner toothed wheel, mounted upon an excentric, driven, or receiving its
motion, from the driving or working pulley, substantially as described and set forth
in Figures 1, 2 and 3.
Secondly In epicycloidal differential pulley blocks, communicating motion
from the epicycloidal trains of gearing to the lifting chain wheel by a transmitting
coupling, consisting of an excentric moving and reciprocating communicator, driven
and driving by means substantially as set forth in Figures 1, 2, and 3.
Thirdly-In epicycloidal differential pulley blocks, the improvements in the
construction and arrangement of the parts, as described and set forth in Figures 1,
2 and 3.
Fourthly In epicycloidal differential pulley blocks, mounting the inner wheel
of an epicycloidal gear upon an excentric or two excentrics, or pin excentrics,
passing through concentrically rotating pinions, as described and set forth in
Figures 4, 5 and 6.
Fifthly In epicycloidal differential pulley blocks, having a movable toothed
annulus, with an inner toothed wheel, which latter makes an elliptical path, with
the teeth consecutively intergearing with the teeth of the annulus in its traverse,
substantially as set forth in Figures 4, 5 and 6.
Sixthly In epicycloidal differential pulley blocks, the combination with an
elliptically path moving inner wheel, mounted upon excentrics, of concentrically
moving tooth pinions, of a driving pulley, with an intergearing pinion, made fast to
and carried by it, as described and set forth in Figures 4, 5 and 6.

page_text: Seventhly In epicycloidal differential pulley blocks, the improvements in the
construction and arrangement of the parts, as described and set forth in Figures 4,
5 and 6.
Dated this 20th day of August 1892.
WILLIAM THOMAS EADES,
By Henry Skerrett,
6, Livery Street, Birmingham, Agent for Applicant.