Improvements in Differential Pulley Blocks and Hoists.
Year: 1892

page_text: The decision of the Comptroller-General; of the 3rd day of April 1894,
allowed, under Section 18 of the Patents, &c. Act, 1883, an Amendment
of this Specification.
Date of Application, 25th Oct., 1892
Complete Specification Left, 20th July, 1893-Accepted, 2nd Sept., 1893
PROVISIONAL DI MUIFICATION.
Improvements in Differential Pulley Blocks and Hoists.
We FREDERICK LIGHTBOURNE of 86 Kyrwicks Lane, in the City of Birmingham
Engine Driver, and CHARLES GIBSON of 39 Grange Road, Small Heath Birmingham
aforesaid, Tool Maker, do hereby declare the nature of this invention to be as
follows:-
Our invention relates to pulley blocks and hoists, with epicycloidal arrangements
or otherwise pulley blocks or hoists having epicyclic trains of wheels for multiplying.
or acquiring power.
1
In these pulley blocks or hoists, which are self sustaining, the controlling excentric
of the inner wheel of the toothed annulus forming the epicyclic train, is upon the
axis of the driving pulley, commonly called the hand wheel, instead of from the
centre of the lifting wheel, and in addition to the usual intergearing wheels and
parts, we employ a power wheel in the form of a large toothed wheel, turning with
the lifting wheel, and intergearing with a pinion integral with the toothed annulus
of the epicyclic couple.
In carrying out one form of our invention in connection with a pulley block, or
an epicycloidal block, of a frame composed of side straps or checks, terminated
and connected together at their upper ends by a cross head or distance block, where-
through a connecting screw bolt passes, and wherefrom the shank end of the
suspending hook of the block swivels.
Located between the upper parts of the said frame is a toothed annulus, or
inside toothed wheel, made in the form of a wheel frame, and carrying upon one
side, a pinion, which intergears with a large toothed wheel, made integral with the
lifting wheel, situated immediately below the toothed annulus as aforesaid, and 'with
the said lifting toothed wheel and lifting wheel, mounted loosely upon an axis or
spindle, whose end bearings are within the sides of the frame, so that as the toothed
annulus and its pinion, which are mounted also upon an axis turning within end
bearings made within the frame, are rotated together, motion is cominunicated to
the lifting wheel through its large toothed wheel, and from the lifting wheel to the
chain passing over it, through the chain sinkings within its periphery.
Mounted upon an excentric made fast with the axis of the toothed annulus, is
an inner toothed wheel, which lies within the recess of the said toothed annulus,
and traverses about the inner toothed periphery as its path. Thus, the toothed
annulus, which is moved by the inner toothed wheel, takes its notion about the
axis or spindle passing through it, whilst the inner toothed wheel takes its motion
from the excentric or excentric boss of the said axis, so that as the periphery of
the inner toothed wheel follows consecutively the teeth of the inner periphery of
the annulus, which is greater in diameter than the inner wheel by one tooth.
according to the power required, or the differential arrangement of the gear, motion
is communicated to the said annulus through the inner wheel, which has integral
•

page_text: with it, a strap, having arms or wings upon the two opposite sides, working within
long slots of an oscillating or a rising and falling frame, guided by gapped upper and
lower ends or parts taking over square studs or blocks carried by the cross head
and the inner side of one of the straps respectively.
Made fast upon the end of the axis, in front of the oscillating frame and strap
as aforesaid, which comes as a boss, upon the front of the inner toothed wheel, is
a hand wheel or driving pulley. fitted with an endless chain, alike unto the
lifting wheel, and with the chain links taking into sinkings formed within the
periphery of said wheel.
The rotation of the axis by the hand wheel rotates the excentric, and with it
the inner toothed wheel, and causes the arms or wings to slide within the side
gaps directed from a middle clearance of the frame, so that as rotation is performed,
the said slots make continuous bearings, as the frame oscillates up and down, and at
right angles to the general direction of the motion of the arms or snugs of the inner
wheel. The guide frame forms a lock for discriminating between the inner wheel
and toothed annulus, so that as the teeth of the inner wheel are made to travel
around the teeth of the annulus, differential motion is imparted in the ratio of
twenty to twenty one, assuming the annulus to have twenty one teeth, and the inner
wheel twenty.
Thus to every single rotation of the axis, and to a single oscillation of the inner
toothed wheel in one direction, the toothed annulus is moved in a reverse direction
through the one-twenty-first part of a rotation, so that it takes twenty rotations of
the axis, and twenty oscillations of the inner toothed wheel, to give one complete
rotation to the toothed annulus:
OPERATION.
The pulling of the chain of the hand wheel, rotates the same, and imparts motion
to the axis, and through it to the excentric, which oscillates, and gives a part
rotation to the inner wheel, slides the arms within the gaps of the locking frame,
which is reciprocated, and cominunicates motion to the toothed annulus, whereby
the pinion fast with it is rotated, and drives a large toothed wheel made fast with
the lifting pulley, which is rotated, hence the lifting..
The hand wheel has a guide, consisting of a semi-circle, following the periphery
of the same, and with inwardly directed cars or clips coming upon one side of the
wheel, whose other side has clip or guide carrying arms.
Instead of a large toothed wheel, an inside toothed wheel may be employed, and
instead. of a pinion on the epicyclic-annulus, a wheel may be employed.
The ratio of the toothed wheels may be varied according to the power
required.
Dated this 24th day of October 1892.
COMPLETE SPECIFICATION (AMENDED).
* Improvements in Differential Pulley Blocks and Hoists.
We, FREDERICK LIGHTBOURNE, of 86 Kyrwicks Jane, in the City of
Birmingham, Engine Driver, and CHARLES GIBSON, of 39 Grange Road, Small
Heath, Birmingham aforesaid, Tool Maker, 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:—“
Our invention relates to differential pulley blocks and hoists such as crab winches

page_text: and the like, and of that class in which internal epicycloidal gear are employed, or
otherwise to pulley blocks or hoists having epicyclic trains of wheels, for reducing
speed for multiplying or acquiring power.
In these pulley blocks or hoists, which are self sustaining, the controlling
excentric of the inner wheel of the toothed annulus and its internal gear forming
the epicyclic train, is fast upon the axis of the driving pulley, commonly called the
hand wheel, instead of being carried from the centre of the lifting wheel, and in
addition to the usual intergearing wheels and parts, we employ a power wheel in
the form of a large toothed wheel, turning with the lifting wheel, and intergearing
with a pinion integral or made in one piece with the toothed anmulus of the
epicyclic couple.
In carrying out one form of our invention in connection with a differential pulley
block, or an epicycloidal block, with combined epicyclic internal gear and ordinary
gear, we take a frame composed of side straps or checks, terininated and connecteil
together at their upper ends by a cross-head or distance block, with a nut at each
end, and wherefrom the shank end of the suspending hook of the block swivels.
Located between the upper parts of the said frame is a toothed annulus, or an
inside toothed wheel, made in the form of a frame, and having upon one side a
pinion, which intergears with a large toothed wheel, made integral with the lifting
wheel, situated immediately below the toothed annulus as aforesaid, and with the
said lifting and power toothed wheel and lifting wheel mounted loosely upon an
axis or spindle whose end bearings are within the sides of the frame, so that as the
toothed annulus and its pinion, which are mounted also upon an axis turning within
end bearings made within the frame, are rotated together, motion is communicated
to the lifting wheel through its large toothed wheel, and from the lifting wheel
to the chain passing over it, through the chain sinkings within its periphery.
Mounted upon an excentric made fast with the axis of the toothed annulus, is an
inner toothed wheel or internal gear, which lies within the sinking or hollow of the
said toothed annulus, and traverses about the inner toothed periphery as its path.
Thus, the toothed annulus, which is moved by the inner toothed wheel, takes its
motion about the axis or spindle passing through it, whilst the inner toothed wheel
takes its motion from the excentric or excentric boss of the said axis, so that as the
periphery of the inner toothed wheel follows consecutively the teeth of the inner
periphery of the annulus, which is greater in diameter than the inner wheel, by one
tooth, according to the power required, or the differential arrangement of the gear,
motion is communicated to the said annulus through the inner wheel, which has,
integral with it a boss, having arms or wings upon the two opposite sides of it,
working within long slots of an oscillating, or a rising and falling frame, guided by
gapped upper and lower ends or parts taking over square studs or blocks carried
by the cross-head and the inner side of one of the straps respectively.
Made fast upon the cud of the axis, in front of the oscillating frame and strap as
aforesaid, which comes as a boss upon the front of the inner toothed wheel, is a
hand wheel or driving pulley, fitted with an endless chain, alike unto the lifting
wheel, and with the chain links taking into sinkings formed within the periphery of
the said wheel.
The rotation of the axis by the hand wheel, rotates the excentric, and with it
the inner toothed wheel, causing the arins or wings to slide within the side gaps
directed from a middle clearance of the frame, so that as rotation is effected, the
said slots make continuous bearings, as the frame oscillates up and down, and at
right angles to the general direction of the motion of the arms or snugs of the
inner wheel.
.
The guide frame forms a lock for compelling the internal gear of the epicyclic
train to move excentrically, so that as the teeth of the inner wheel are made to
travel around the teeth of the annulus, differential motion is imparted in the ratio
of 20.to:21 assuming the annulus to have 21 teeth, and the inner wheel 20.
Thus, to every single rotation of the axis, and to a single oscillation of the inner
toothed wheel in one direction, the toothed annulus is moved in a reverse direction

page_text: through the one twenty-first part of a rotation, so that it takes twenty rotations of
the axis, and twenty oscillations of the inner toothed wheel, to give one complete
rotation to the toothed annulus.
Figure 1 of the accompanying drawings represents partly in vertical section, and
partly in elevation, a differential pulley block constructed, arranged and provided
with improvements made according to our invention.
The epicyclic or internal gear wheels are shown in section in common with a
hand wheel, which is made fast upon the driving axis, having upon it, an excentric,
through the medium of which, and a rising and falling frame, the internal working
wheel of the epicyclic train is made to perform an excentric path, and to roll upon
the teeth of the toothed annulus.
Figure 2 represents a vertical section upon the dotted lines A B Figure 1, thus
removing the cheeks constituting the sides of the frame, and showing the relative
positions of the gear, and also the arms which work within the slots of the frame.
a, a are side straps or cheeks constituting the side frames of the block, and which
are connected together and terminated at their upper ends a', by a hollow cross
head and distance block a², where through a connecting screw pin a³, passes, and
from which cross head, the swivelling shank a', of the suspension hook a³, swivels.
Located and fitted within the upper part of the sides of the frame is a toothed
annulus or an inside toothed wheel, with a pinion or toothed wheel ', made in
one piece with it, and which combined annulus and pinion or toothed wheel is
mounted loosely upon a transversely directed axis c, working within bearings aª, a², of
the side cheeks or frames a.
The toothed wheel or pinion, made in one piece with the toothed annulus,
as aforesaid, intergears with a power wheel d, in the form of a large spur wheel made
in one piece with a lifting wheel e, fitted with a lifting chain, having the usual
hooks, and which combined lifting wheel and power. wheel run loose upon a
threaded and lower axle g, with its ends taking their bearings through holes a', in
the cheeks or sides a, and with nuts g', taking upon the necks or reduced ends ²,
of the said axle.
The upper axle 6, has made fast upon one end, or upon its outer end, a hand
wheel, (which has a shield 2), with bearing, and with a chain i, taking within
the sunken periphery of the said hand wheel or pulley.
Made in one piece with the middle part of the axle c, is an excentric c', upon
which an internal toothed wheel or an internal gear, is mounted, and when
excentrically moved, its teeth intergear with the teeth" 2, of the annulus, as
its path.
The said internal wheel or gear j, has a circular boss j*, carrying arms, at its
two opposite sides, which take and slide within slots or gaps k², of a rising and
falling frame k, and kept vertical in its movement by gaps or slots k', taking over
square blocks m, m², carried at the lower and upper parts of the frame respectively,
so that as the axis is rotated, so the excentric upon it carries the internal gear
round, and so compels the same to take the path of the teeth of the toothed annulus
by the lifting of the frame, and the keeping of the internal gear constant in an
excentric path. by the arms, moving and sliding within the gaps k³.
OPERATION.
By pulling one side of the chain i, of the chain wheel h, motion is communicated
to the said wheel, and through it to the axis c, and the excentric c'. Then the
internal gear, is excentrically turned, and its arms ³, made to slide or work within
the gaps k², of the locking frame k, which is then sub ruta reciprocated as the said
internal wheel j, revolves in its excentric path, hence the communication of motion
thereby to the toothed annulus b, and its pinion which latter drives the large
tooth spur wheel or power wheel d, and through it, the lifting wheel e, which is
rotated, and the weight lifted proportional to the speeding down of the said lifting
wheel.
*

page_text: Instead of a large toothed wheel, an inside toothed wheel may be employed,.
and instead of a piniou on the epicyclic annulus, a wheel may be employed.
The ratio of the toothed wheels may be varied according to the power required.
Having now particularly described and ascertained the nature of our said
invention, and in what manner the same is to be performed, we declare that
what we claim is :-
First: In differential pulley blocks and hoists, employing in connection-with-
the axle of the hand wheel or pulley;-an-internal-gear-controlling excentrie;-sub-
stantially as described and set forth.
Secondly First-In differential pulley blocks and hoists, the combination with a
toothed annulus b, carrying toothed pinion 6', and having an excentrically mounted
internal gear, controlled by a frame k, of an excentric c¹, carried by an axis c,.
having at one end of it, and made fast to it, a hand wheel h, substantially as
described and set forth.
Thirdly Secondly :-In differential pulley blocks and hoists, the combination with
axle c, with excentric c', and hand wheel h, made fast to it, and with an internal
gear wheel, controlled by a frame k, and communicating motion to a toothed
annulus b, with spur wheel b', of a power wheel d, consisting of a spur wheel or a
toothed annulus or equivalent gear, substantially as described and set forth.
Fourthly Thirdly -In self-sustaining differential pulley blocks and hoists, the
general construction, arrangement and combination of the parts; with or without.
the shield 3, substantially as described and set forth.
Dated this 17th day of July 1893
FREDERICK LIGHTBOURNE,
CHARLES GIBSON,
By Henry Skerrett,
6, Livery Street, Birmingham, Agent for Applicants..