Improvements in Sheaves or Pulleys for Use in Working Metallic and other Ropes and Cables.
Year: 1886

page_text: Improvements in Sheaves or Pulleys for Use in Working Metallic
and other Ropes and Cables.
I GEORGE DANIEL DAVIS of Garford Street Poplar in the County of Middlesex,
Engineer, do hereby declare the nature of my invention for IMPROVEMENTS IN
SHEAVES OR PULLEYS FOR USE IN WORKING METALLIC AND OTHER ROPES to be as
follows:-
The object of these improvements is to enable the ropes to be held in the sheave.
or wheel with increased holding power.
I construct my improved sheave or pulley provided with circumferential grooves!
or recesses and these recesses have four, six or other number of cross recesses formed
by projecting pieces or notching or removing portions of the groove walls leaving
a wheel or sheave with say six parts removed and having six part grooves of
wedge cross section and I so arrange the shaped projecting, surfaces that as the
rope în tension is drawn tightly around the wheel or sheave the tendency of the
strain is to bed it more tightly and firmly into the grooved part-channels and the
part-channels being formed with parallel ends give even holding, surfaces for
engaging the rope with great exercise of retaining power.
For very heavy work such as raising anchors I sometimes introduce one or more.
rollers around which the rope is partly passed for guidance to and from the sheave
for the purpose of keeping the rope close into the wheel.
'
+
I fit these wheels to. capstans, windlasses, steam winches, sides of ships (where
they can be used for the working of the yards and sails) or otherwise.
The relative positions of the projecting parts and of the recessed parts or of the
gripping pieces and of the free spaces may be transposed and the line of recess in
which the rope lies may be a plain circumferential line or approximate to a curve
or series of curved or other waved lines.
Dated this 2nd day of Januar 1886

page_text: Improvements in Sheaves or Pulleys for Use in Working Metallio
and other Ropes and Cables.
I GEORGE DANIEL DAVIS of Garford Street Poplar in the County of Middlesex,
Engineer do hereby declare the nature of my invention for IMPROVEMENTS IN
SHEAVES OR PULLEYS FOR USE IN WORKING METALLIC AND OTHER ROPES and in
what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement:-
The object of these improvements is to enable metallic and other ropes to be
held in sheaves, pullies or wheels with increased holding power and security from
slipping and yet not inconveniently to increase the size of the sheave or pulley so
as to cause it to occupy an inordinate or impracticable amount of space which
especially on board ship is an important consideration.
My improved sheave or pulley is constructed substantially as illustrated by the
accompanying drawings in which Figure 1 shews a plan or face view of the wheel
or sheave and Figure 2 a section thereof Figure 3 shewing a cross section at right
angles to the line of section of Figure 2 and Figure 4 an edge view.
Figures 1 and 1b shew a modified arrangement in which only one guiding
sheave C is used instead of two as in Figure 1 and means for adjusting the
position of that guiding sheave C at any desired one of a series of points around
the circumference of the capstan base or other point. Fig. 1° shows an edge view
partly in section of the plates E and F.
Figures 5, 6, 7 and 8 shew like views of a modification of the wheel or sheave in
the form of the intermediate spaces between the inclined part wall, holding whelps
or projecting faces a.
.
Figures 9, 10, 11 and 12 shew like views of a further modification adapted to
work ropes which have pieces of chain or linked cable attached thereto such as is
required to be provided by the present Board of Trade regulations for certain
classes of vessels, this wheel being adapted first to work in a wire rope by the
inner part and then a portion of chain cable by the outer portion, or vice versa.
Figure 13 shews by a section Figure 14 by side view Figures 15 and 16 by
internal views the opposite inner sides and Figure 17 by an external edge view
respectively a further modification of the invention in which whilst one inner
face A of the wheel is formed as in the preceding figures 1 to 7 inclusive the
other and opposite inner face A is formed of plane faces a abutting on each other.
and without recesses or spaces b being formed between them but maintaining the
parallelism of the sides of the same distance from the centre of the wheel and so
that the rope shall lie in a series of plane channels each at right angles to a radial
line from the wheel centre.
Figure 18 by a section Figure 19. by side view Figures 20 and 21 shew by
internal views the opposite inner sides and Figure 22 by an external edge view a
further modification in which both inner faces A¹ A¹ of the inclined groove are
formed of conjoined plane faces without interposed recesses.
In the wheels as shewn by way of example, I have represented them as having
six projecting parts a and six recessed parts b to each inner face of the wheel but
.

page_text: in practice I construct my improved sheave or pulley or wheel provided with four,
Bix, or other number of cross recesses and projections around the circumferential:
groove or recess as found most convenient for the requirements of the case.
These projecting surfaces a each have a plane faced inclining or V shaped walls
inclining from the central groove or channel in which the rope lies and these.
projections are each formed with ends or edges 3 each substantially parallel with.
a line, y drawn radially of the wheel and centrally of the face of each such
projection leaving a recess b between each two projections a so that as the rope in.
tension is drawn tightly around the wheel or sheave for the major portion of its
circumference within the V groove 3 the tendency of the strain is to bed the rope
more and more tightly and firmly into those grooves formed by the part channels.
as the strain is increased. These inclined plane surfaces of the projections a a.
form a series of straight or level short, or part, channels in which the rope when
under tensional strain lies bedded in correspondingly straight lines and at right
angles to a line x, y drawn tangentially from the centre A* through the middle
of the width of said projection.
The sides of these plane surfaces a abutting on and forming the walls of the
recesses b being parallel to their respective radial lines x. y cooperate to exert great
holding power upon the rope and together with the form of the part channel tend
to engage the rope with great exercise of retaining power whilst enabling a
relatively small wheel to be used.
C, C are guide rollers one or more of which may be provided or dispensed with
altogether, according to the nature of the work to be performed thus in apparatus
intended for use for very heavy work such as raising anchors I sometimes
introduce two as shewn in the drawing Fig. 1, or other number as desired.
I find it convenient to fit my improved sheaves or holding wheels to capstans,
windlasses, steam winches, sides of ships or vessels or in other situations and
amongst numerous other uses they are very convenient for working the yards and
sails of ships and for pulley blocks.
The relative positions or forms of outline of the projecting parts or gripping
pieces a and of the recessed parts or free spaces b may be transposed and the part
lines of inclined channel 4, 4, in which the rope lies wedged whilst preserving for
each part channel a base line 4, 4, at right angles to the radial line x, y may be
inclined waved or curved laterally.
When it is required to work wire ropes to which are attached portions of chain
cable, as is at present required by the regulations of the Board of Trade for certain
classes of vessels, the modification shewn by Figures 9, 10, 11 and 12 may be
employed with advantage as thereby the wire rope or like portion of rope may be
worked in the inner grooves B and the chain cable portion in the outer portion H
the links of the chain cable lying in the recesses & formed between the whelps a¹ as
usual in chain cable holding wheels or sheaves as is well understood but with this
important advantage accrueing in the present arrangement from the combination
of the improved inner rope holding device and these outer holding devices for
the chain cable that the combined wire rope and chain cable can be worked in on
the one wheel without necessity for shifting. from one wheel to another-from a
rope wheel to a chain wheel-aš is at present necessary to be done.
In most cases it will not be necessary to employ two guiding sheaves C, C as
shewn in Fig. 1 but only one as shewn in Figures 1 & 1b and further when the
wheel or sheave A is placed horizontally at the bottom of a capstan D or worked
horizontally with bars only it is advisable to adopt a revolving metallic plate E
fitted round the bed plate F of capstan, this revolving metallic plate E supports a
revolving sheave G around which the rope is led carried by a bearing stud M
secured to the plate E and this plate E has a suitable number of holes e for
connecting the two plates E and F together at any circumferential point by means
of the pin I so that the rope can be used with advantage from any part of the
ship or a similar arrangement can be applied when the sheave or wheel A is
required to be worked vertically.

page_text: F, F indicate means which may be employed for securing the wheel or sheave in
its place say to the deck or other part of a vessel.
1
Having now particularly described and ascertained the nature of my said
Invention, and in what manner the same is to be performed, I declare I am
aware that various plans have been proposed for holding ropes-by whelps
projecting alternately from opposite sides of a circumferential channel or groove
around a wheel-by corrugated and other irregular sides or walls to a circumfer-
ential channel around a wheel-by channels or recesses of V or wedge section
sometimes made plane sometimes devious or corrugated laterally in its peripherical
course and otherwise but I make no claim to any of those arrangements but what
I do claim is :-
1. The construction and use of wheels sheaves or pulleys for use in working
metallic and other ropes, such as are herein before described and illustrated in
Figures 1 to 8.
2. The construction and use of a wheel or sheave wheel for use in working
metallic and other ropes having lengths or portions of linked cable attached
thereto, such as are hereinbefore described and illustrated in Figures 9 to 12.
Dated this 7th day of September 1866.
WM BROOKES & SON,
55 & 56, Chancery Lane, London,
Agents for the said George Daniel Davis.