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Патент USA US3083942

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Aprll 2, 1963
‘
R. A. CROWLEY ETAL
3,083,932
AUTOMATIC OSCILLATING ANGLE AND OFF-‘CENTER COMPENSATOR
'
SHAFT AND FLOATING SHEAVE COMBINATION APPARATUS
Filed Oct. 6, 1960
3 Sheets-Sheet 1
c
_
~
INVENTORS.
ROBERT A. CROWLEY
REYNULD E. SMITH
F L. LeBUS 51?.
\
ATTORNEY
Aprll 2, 1963
R. A. CROWLEY ETAL
3,083,932
AUTOMATIC OSCILLATING ANGLE AND OFF-CENTER COMPENSATOR
-
SHAFT AND FLOATING SHEAVE COMBINATION APPARATUS
Filed Oct- e, 1960
s Sheets-Sheet 2
F“
INVENTORS.
ROBERT A. CROWLEY
REYNOLD E. SMITH
.
EL LeBUS
ATTORNEY
s/e.
Aprll 2, 1963
R. A. CROWLEY ETAL
.
3,083,932
AUTOMATIC OSCIL TING ANGLE AND OFF {CENTER COMPENSATOR
SHAFT AND FL TING SHEAVE COMBINATION APPARATUS
Filed Oct. 6, 1960
3 Sheets-Sheet 3
INVENTORS.
.
‘
'
,5‘ ' .151
ROBERT A. CROWLEY
Jam/0L0 E. 5mm
'19 ATTORNEY
F -
[eBUS‘ $13.4
United States Patent‘
” 1C6
31,083,932
Patented Apr. 2, 1963,.
1 ,
back on the next layer before-the cable reaches the drum
$083,932“
?ange, or, the cable will move two .or three groovestoward'
tliepcenterof theldrurn as soon as it’ rises, at ,th'ej?ange.
lnr‘either. ."event," there will . be voidsv or, gaps ‘in the, cable
AUTOMATIC OSCILL’ATING ANGLE ANDMOFF-r
CENTER ~ COMPENSATORQ SHAFT » AND- FLOAT
ING SHEAVE COMBINATION APPARATUS 1
Robert A; Crowley,‘v Reynold E.'Smitl1,“.and>"Fi'auklih L 5 sporoled' on the drum,‘ which resultslin an uneven winding .
Le Bus, Sn, Longview, Tex., assignors to Let Bus :' on'the core otthe ‘drum.v
Many 'e?orts have been made ..to improve the, e?iciency
Royaltyicompany, Longview; Tex., a partnership 1
of cable'winding operations; Frequently, an‘ operator will
Filed-Oct. 6, 1960, Ser._No.\ 61,010.
8 ‘Claims. (Cl. 241-157, (1)1
stand ,in thenvicinity, of the drum ras the ,cablerhavin'gi‘a'
This invention relates to improvements in cable spooling ‘
apparatus, and more particularly, but notby wayjof limita
tion, to a cable reeving automatic ‘compensator-apparatus
particularly ‘ designed and ' constructed ‘for,’ compen'sating_
1
bad‘?eet angle is‘beingjspoole'd thereon, and with the 33'
si'stance'of a ‘crow bar,jor the‘like,_will..attempt,to’ manual; ,
ly guide‘the cable' and correct, or overcome thebad?eet '
angle','which‘ is ‘obviously,ine?icientanddangerous, As a
result; many ‘devices have‘ ‘beenjpdeveloped ‘for ' guiding vthe 1
for and correcting the ?eet angle of the cableipawh'eni the" 15 cable or holding, the line spoolin'gonto the 'drium‘within' the
?eet ‘angle of the 'cable winding onto ‘or oifvthe drurnlis a,
detriment to the good even spooling ,ofthe cable'iso-that ‘
it may be spooled on the drum e?icientlyi and ‘evenly
without distortion or entangling of the cable. during the
windingv operation.
are usually eith‘er‘expensive',geared‘type structures, or are
manually; operatedgwith the inherent human errors ‘and in=
e?iciencies,‘ In‘ addition,‘ the presently available reeving;
‘ 20 structures for this purpose, normally: provide a considerable '
Many problems are encountered in, the winding or spool;
ing of a wire line or cable‘ onto a drum.
necessary or‘ desirable?eet angle ‘limits; Th‘esetdevices
Cable‘ havingv a
bad ?eet angle from the stationary sheave to' the’ drum
core has a tendency to wind'unevenly on the core of the »
amount‘of‘friction ‘which-must‘ be overcome ‘during, the
operation'fthereof, thus greatly ‘reducing, the ei?ciency
of) operation.
The present invention contemplates a novel ‘?eet angle
drum,‘ which results in a jerking and tangli'n'g of the cable. 25 compensating apparatus‘ providing ,for, an vautomatic op¢v
as it is'unspooled; This is a particular disadvantage in
eration'in‘accordance with vthe pressure or tension of ‘the,
a hoisting or cable winding operation wherein a relatively
cable ‘to maintain'a smooth and evenspoolingpperation.
short mast is utilized with a relatively long spoolingv drum.
The friction [in the operationof the ‘novel compensating
Under this type of circumstance, the ?eet angle of the
reeving device‘ for‘eliminatin‘g‘?eet'an‘gle ,ofithe line. as it,v
cable between the ?xed sheave and the drum‘ismusually
isjreeved ‘onto the‘drumds' reduced‘to a'minimum?for
extremely excessive or bad, and it is often dit?cult to corn
optimum'e?iciencyof control of the cable during the winda
pen‘satefor the angle to'maintain a'co'ntrol o‘flthe 'spoola
in'g'thereof' onto the ‘drum; The‘?eet angle compensator
ing operation.- In addition, it ‘is important-that each layer ‘
is particularly designed ,to provide a compensation'for '
the ‘?eet angle in both'vertical' and horizontal planes.‘ The ,
of the cable extendacross the drum core from ?ange'jto ‘
?ange‘with'each successive‘wrapnor turn of'each layer. 35 cable passes'over a movable sheave-particularly designed
to‘ move'laterally'to ‘an angle in responseyto ‘pressure ‘of’
adjacent Wrap without piling up orlaying on top. of each 1
the cabl‘e'wlrerebythe cable'is orientated’ with respect to
of the cable‘ being disposed in a close relationship tdthe
other in the proximity ofthe ?ange, or-pile 'upinthe mid,
die or eitherside of the drum core between the ?anges}
It‘ is, di?i'cult to control the winding of the cable ‘with the,
successive turns close together, particularly in well bore,
the drum ‘at the ‘optimum angle’ therebetween‘for providing _
an ef?cient spoolingthereof. The present inventionrmayv '
be utilizedtfor controlling'the spooling operation, ,as well.‘
as correctingjthe ?eet'angle'of the cable. _ However; it" is,
preferable; but'n‘ot limited thereto, to utilize‘ the'novel ap
paratus in‘combination with” the LC‘BLIS counterbalanced
spooling system hereinbefore set'forth; thus assuring a
complete and e?icient’spooling of; thecable.
drilling operations wherein the load on. the cable frequent,
lycauses ‘a twisting of the cable. If the initial layerof‘the.
cable is inefficiently wound on the drum,‘ and the ?eet angle
is bad,‘ the error. will be increased‘with'each successive, 45
layer until the control of the cable willlbe substantially
The ‘sheave-is ' interposed between-the‘ ?xed sheave -‘ and -‘
lost.
thedrum ‘forreceiving-th'e cable therearound,‘ and-miscar
Thespooling of'multiple layers of cable onto the‘drum >
core has also presented a problem to' the hbistin'gindus
try. A‘counterbalance spooling-system for providing ‘a true and e?‘icient winding of- multiple‘ layers of'cable has ~
been developed by Franklin L. Le Bus,-Sr., a co-inventor
of the present apparatus, and as disclosed in various Le
Bus prior ‘patents, such as United States Letters Patent
ried by an eccentrically disposed shaft-L The‘ ?oating
sheavelis movable along-the‘ shaftlin-respon-se to the pres
sure-of theiycableiwhe'reby theshaft is rocked-‘oroscillated!
in an~eccentric~motion‘withrespect'to‘an axis of ‘rotation:
thereof;
’
Aswill-here-inafter
more fully appear, the axis-
of ' rotation of lthe : shaft ‘is ,nona‘copla'nart with; respect Ito
the‘longitudinal: axis‘ 'of the shaft'itself." The-‘automatic
No. 2,620,996,‘ issued December 9, 1952, and entitled 55 eccentric movement ‘of the shaft combined 1withthe1 lateral '
“Cable .Winding Apparatus”; No. 2,708,080, issued May
movement of the sheave therealong provides lanarcuate .
10, 1955,‘ and entitled “Hoisting Drum”; No. 2,732,150’,
path ofimotionrfor the-center'lineofthe sheave as theca
issued January 24, 1956, and entitled “Balanced Cable“
ble< is woundior unwound'from the ‘drum. Thisxarcuatev
Spooling”; and No. 2,734,695, issuediFeburary 14, 1956,
movement. of the ?oatingsheavemaintains the ;length' of
and entitled‘ “Balanced Cable spooling)’ The spooling 60 the cable between the ?xed sheave and thetdrumrsubstan-e
system developed by the aforementioned patents has great
tially constant throughout the spooling operation fandcom
ly advanced the cable spooling‘art and has ‘met with ‘wide
pensates =for= thef?eet anglerbetween the ?xedl'sheave and
acceptance in hoisting, industry of‘ all types. However,
an e?icient control of the cable can be'maintain'ed with
thedrum. This-actionv of; maintaining the; length v~of~the
cable jconstant»between~.the ?xed‘ sheave andthe drum, is 7
the counterbalanced spooling. system only if the fleet anglev 65 an important feature of the e?'icient compensation oither
of the cable between the ‘?xed sheave and the drurn'is
?eet angle, ‘and resultsnin a substantially, perpendicular
contained with certain limits‘, preferably not greater than
path for the cable vwith respect to theaxis .of the ,drurmas,
approximately one and one-half degrees, but not limited
the cableleaves the. drum. This substantialelimination
thereto. It ‘has been foundthat a?eet angle in excess of
otthe ?eet angle results inpra greatly increasedgei?ciency
this‘ size, or greater than one and one-half degrees, creates 70 of 'the‘cablej spooling operation‘. However, his to be
further problems in the spooling operation in that the‘ line
noted that the reeving-apparatus ‘or ?eet ‘anglescompensai
will tend to‘be‘ pulled-up on a preceding wrap'and'start'
tor apparatus is not'intended’to be a‘cable'spooling device
8,088,932
FIGURE 5 is a view similar to FIG. 4 showing another
in itself. The true and e?icient spooling provided by the
aforementioned Le Bus counterbalanced spooling system
is desirable to provide for the over-all efficient results of
the ?eet angle compensator apparatus. The compensator
apparatus will function to correct the ?eet angle with sub
stantially any cable spooling operation, but the end results
position of the cable spooling operation.
FIGURE 6 is a view similar to FIG. 4 showing still an
other position of the cable spooling operation.
FIGURE 7 is an elevational view taken
FIG. 4.
FIGURE 8 is an elevational view taken
of e?iciently spooled cable on a drum will be only as true
FIG. 5.
as the cable spooling device utilized therewith. Thus, it
FIGURE 9 is an elevational view taken
is important that the ?eet angle compensator apparatus
be utilized with a counterbalanced spooling operation for 10 FIG. 6.
FIGURE 10 is a side elevational view
optimum ei?ciency thereof in cable winding in all hoisting
on line 7——7 of
on line 8-8 of
on line 9—9 of
of a ?eet angle
operations.
compensator embodying the invention depicting a modi
It is an important object of this invention to provide a
novel reeving apparatus for compensating for and con
trolling the ?eet angle during the spooling of a line onto
a drum in a true and accurate manner for substantially
for purposes of illustration.
FIGURE 11 is a perspective view of a modi?ed form
?ed mounting therefor and with portions in dotted lines
for the eccentric shaft member.
FIGURE 12 is a sectional view of the ?oating sheave
eliminating any distortion or entanglement of the cable
member and bushing therefor.
during the spooling operation.
FIGURE 13 is an enlarged sectional view taken on line
It is another object of this invention to provide a novel
?eet angle compensator apparatus particularly designed
20 13-13 of FIG. 4.
FIGURE 14 is an enlarged sectional view taken on line
14—14 of FIG. 5.
FIGURE 15 is an enlarged sectional view taken on line
throughout the spooling or unspooling operation.
15-15 of FIG. 6.
Another object of this invention is to provide a novel
FIGURE 16 is a free body force diagram of the forces
?eet angle compensator apparatus which is responsive to
acting on the eccentric shaft.
the pressure of the cable for automatically compensating
Referring to the drawings in detail, reference character
for the ?eet angle in the cable spooling operation.
10 generally indicates a drum or winch having a cable 12
A further object of this invention is to provide a ?eet
spooled thereon. The drum 10 may be journalled on a
angle compensator apparatus for automatically providing
?eet angle compensation for both vertical and horizontal 30 suitable shaft 14 for rotation, and is provided with op
posed end ?anges 16 and 18 as is well known. It is pref
movement of the cable.
erable that the drum it} be provided with a core 20 (FIG.
Still another object of this invention is to provide a
1) having a plurality of cable receiving grooves 22 on
novel ?eet angle compensator apparatus for automatically
the outer periphery thereof to facilitate the winding or
maintaining the cable substantially perpendicular to the
spooling of the ?rst layer or wrap of the cable 12 onto
axis of the drum at all times during a cable spooling op
the drum 10, as is well known in the industry, and as set
eration.
forth in the Le Bus counterbalance spooling patents here
A further object of this invention is to provide a ?eet
tofore described. However, it is to be noted that any
angle compensator apparatus which may be adjusted to
suitable drum or winch may be utilized with the invention.
compensate for any misalignment of ?eld installations or
and constructed for maintaining a substantially constant
length for the cable between the ?xed sheave and the drum
change in the disposition of the ?xed sheave with respect
to the drum whereby the ?eet angle will be corrected ac—
cordingly.
A still further object of this invention is to provide a
?eet angle compensator apparatus for automatically cor~
recting a bad ?eet angle and which is connected to the
drum only through the cable itself.
Another object of this invention is to provide a ?eet
angle compensator apparatus for automatically correcting
a bad ?eet angle which is responsive to the pressure in
40
A ?eet angle compensator apparatus, generally indicated
at 24, is secured in juxtaposition to the drum 10, as will
be hereinafter set forth, and is interposed between the
drum 10 and a ?xed position sheave 26 (FIG. 1). The
cable 12 extends from the drum 10, through the reeving
apparatus or ?eet angle compensator apparatus 24, around
the sheave 26, and thence to the load (not shown) being
manipulated thereby. The sheave 26 may be journalled
for rotation in any well known manner (not shown), and
is normally spaced from the drum as clearly shown in
1 in such a manner that the sheave 26 is substantial
the cable for the operation thereof completely independent 50 FIG.
ly centrally disposed between the drum ?anges 16 and 13.
of manual or other attention.
Still another object of this invention is to provide a ?eet
However, there are many installations in which the sheave
26 is disposed to either one side or the other with respect
angle compensator apparatus wherein the friction from
to the drum 10, and the ?eet angle compensator apparatus
a bad ?eet angle during the operation thereof is reduced 55 24 may be adjusted to correct for any misalignment or off
to a minimum for greatly increasing the e?iciency thereof.
set installation of the sheave 26.
It is a still further object of this invention to provide a
The ?eet angle compensator apparatus 24 comprises
novel ?eet angle compensator apparatus which is simple
an off-center or eccentric compensator shaft 28 having
and e?icient in operation and economical and durable in
an arm or throw member 30 and 32 provided at the op
construction.
60 posed end thereof. The throw members 30 and 32 are
Other objects and advantages of the invention will be
preferably mutually perpendicular with respect to the
evident from the following detailed description, read in
shaft 28, but are off-set or angularly disposed with respect
conjunction with the accompanying drawings, which illus
to each other, as indicated by angle A in FIG. 3. Each
trate our invention.
In the drawings:
FIGURE 1 is a perspective view of a ?eet angle com
pensator apparatus embodying the invention and depicted
in combination with a cable spooling drum and ?xed
sheave.
FIGURE 2 is a perspective view of the eccentric shaft
of the ?eet angle compensator apparatus.
FIGURE 3 is an end elevational view of the shaft.
FIGURE 4 is a plan view of a ?eet angle compensator
of the arms or throw members 30 and 32 is provided with
a substantially perpendicularly extending trunnion mem
ber 34 and 36, respectively. The trunnions 34 and 36,
as shown in FIG. 2, are preferably in substantial axial
alignment, as indicated by the broken axis line B. The
longitudinal axis C of the shaft 28 is disposed at an angle
with respect to the common axis B of the trunnions 34
and 36. The axis B is the center-line of rotation for the
shaft 28, and it will be apparent that the off-set and angu
apparatus embodying the invention, and depicting one
lar disposition of the axis C of the shaft 28 with respect
to the axis B provides for an eccentric rotation of the
position thereof during the cable spooling operation.
shaft 28 for a purpose as will be hereinafter set forth.
The off-set and angular disposition which provides‘ theq
eccentric rotation of the shaft 28, as described above,~re
sults from the fact'thatthe’ longitudinal axis C of the
shaft 28‘ and the axis B (which is the axis of rotation of 1
the-shaft) are disposed in a skew orinon-coplanar‘rela
tion with respect to each-other, as williclearly appear
from a consideration of they drawings.‘
=
The throw of the‘ shaft‘28 may be-de?ned as the dis
tancebetween the axis B ‘of the trunnions 34 and 36 and '
the axis C of the shaft as measured-at the end of the
shaft 28.- Of course, the arms 30-‘and 32 may notbe'
perpendicular to the shaft 28, but it is preferable to pro
vide a perpendicular relationship therebetween, thus the
tials? inthevcable 12, such‘as when-the 1ine~slackens or
In this
manner, .the?eet ‘angle compensator
’
tightens.
apparatus will automatically‘ adjust‘ tovariable vertical
positions of the cable-12 windingiore unwinding ifrom v.the'
a drum 10,- and thus provide'compensation' for both hori
zontal and-vertical ?eet angles:
FIGURE 11 disclosesa shaft 64 similar. to the eccentric ’
shaft 28. Thershaft64is providedswith opposed arms -
or throw'members 66-and 68similar-tothe throws‘30 and
‘32, vand each of} the'throws 66 and‘68 is provided with
outwardly extending trunnion members v70*and-y72, re
spectively. It -will be readily apparent from» FIG. vll
thatlthetrunnions 70I and~~72 are »not'in axial-alignment.
In this instance, the trunnions 70 and. 72 aremounted
arms become the throws of the shaft. The angle A'be
tween‘ the throws 30=and 32>(FIG. 3) may be varied in 15 iniself-aligning bushings ‘or bearings‘ (not shown) in lieu
of the blocks 48and 50, whereby the axis'of rotation of _
accordance with the drum and sheave installation or oper
ating conditions, and is preferably maintained at an angle
less than one hundred eighty degrees. It has been found
under practical working conditions that when the angle
A approaches or becomes as great as one hundredeighty
degrees, the apparatus'24 may not operate automatically.
with the usual ef?ciency possible when theangle A is-less
than one hundred eighty degrees. In addition, the length
of the throw may be varied in accordance with the oper—
ating conditions to provide the most efficient eccentric
movement for the shaft 28 for compensating for and cor
recting the ?eet angle of the cable 12,’ as will be herein
after set forth.
the shaft 64 will be as indicated by the line ,D, regardless,
of --the-falignment or‘misalignment ofv the trunnions 70 ._
and -72. The axis D is angularly disposed-with respect»
tothe axisE of the shaft 64, and'the rotation-ofthe shaft
64 about the axisD will provide substantially the same.
eccentric movement asset-forth withrespect to the- shaft
28. Thus, the trunnions-need not be in axial alignment»
as long as they are carried by any suitable self-aligning
means, such as a'self-aligning bearing.
Operation
The ?eet angle of the cable 12 between the ?xed sheave
'
i
26 ‘and the drum 10 is indicated by the angle F-in FIG. 1.
A ?oating sheave or pulley 38 is journalled on the shaft
28 and is transversely movable therealong in response to 30' In-spooling operations wherein no ?eet angle compen
sator device is utilized in cooperation with thespooling
theltension or ‘pressure on the cable 12 being spooled or
drum, the cable orline 12 will tend to seek-the shortest’
unspooled onto the drum p10.‘ Thesheave 38 may be
distance from the ?xed sheave 26 to the drum. In other 7
journalled on the shaft 28 in any suitable manner, such
words, the line 12‘ will try to .pile up at a point on the,
as particularly indicated in FIG. 12. As shown herein,
drum where a line passing through the sheave 26 is pen
a split bearing orbushing member 40 is secured around
pendicular to the drum axis. It vwill be apparent that
the shaft 28 in any suitable manner and rotatable thereon,
if» the lengthof the cable 12 between the sheave 26-and
as well asmovable therealong. The sheave or pulley 38
the vdrum 10 is maintained substantially constant at all
may be provided with a central hub portion 42 adapted
for disposition around the bushing 40 and secured thereon
times during the spooling operation, there will. be no’
operate with a plurality. of pockets 46 provided on the.
will tend to pile up. Thus, the ?eet-angle compensator
apparatus 24 is interposed between thee?xedlshe-ave 263
by a plurality of spaced set screws or the like'(not shown) , 40 shortest distance for the-cable to seek. As a result, there
will be no preferred position on the drum where the cable
extending through the bores 44. The. set screws co-'
outer periphery of the bushing 40 for securing the pulley
38 thereon whereby the bushing 40 and pulley or sheave
3'8 will rotate and move along the shaft 28 as a unit.
The trunnions 34 and 36 are carried by suitable ‘spaced
mounting blocks 48 and 50‘ which in turneare supported
and the drum 10 to maintain the ‘length of the cable 12
a
therebetween substantiallyv constant throughout the spool
ing operation.
The ?oating sheave 38 moves laterally ‘along the/shaft
28 in response to the pressure'or tension in the cable 12
during the spooling or unspooling thereof from the drum
52. The mounting blocks 48'and 5.0 may be of any suit
able type, such as pillow blocks,‘ self-aligning‘ bearings, 50 10. Any movement of the cable to the left or right of
the mean or center point P» (FIG 1) of the drum 10* will
or the like, for permitting a free rotation of the trunnions
cause the compensating or ?oating pulley 38 to move to
therein. As clearly shown in FIGS. .13, 14 and 15, each
eitherltherleft or right of the center point in accordance
of the trunnions 34 and 36 is substantially identical and
with the direction of the spooling, orunspooling of the
is‘ preferably provided with a ?at surface, such as 54,
>lineor cable. The-pressure of the cable. 12 and the‘
adjacent one end thereof‘and extending into a bore 56
sheave 38 ‘rotates the shaft 28 about the-axis B' for chang
provided in the respective mountingblock. An angular
ing theangular- positionlof the shaft, as-clearly shown in
stop member 58 is provided in the bore 56 for contacting
FIGS. 4, 5 and 6. The rotation‘ of the shaft 28 is limited \
the flat surface 54 in order to limit'the ‘rotation of the
in both the clockwise and counterclockwise directions by
trunnions in both the clockwise and counterclockwise
the ?at surface 54 and the stop 58. Thus, the shaft ‘rocks
rotation thereof. This precludes a rotation oil the trun
or oscillates about the axis B in accordance with the di
nions‘ through a complete revolution of three hundred
rection of travel of the cable ‘12,"and as a'result,‘ the-cen
sixty degrees, thus providing for an oscillation movement.
ter line of the sheave 38 moves through'ian arcuate path,
of the shaft 28 in response to the movement of the sheave
in any well known manner, such as the brace members
as indicated by the dotted line-G in FIG. 4.
'
38 therealong.
The eccentric movement of- the shaft 28 moves the.
FIGURE 10 depicts a modi?ed type of mounting struc 65
sheave 38' alternately toward‘ and away from the- drum
ture for the ?eet angle compensator device 24 ‘wherein
10 whereby the segment X-(FIG. l) of- the'c-ablebetween
the mounting blocks ‘48' and 50l-are sutiably secured to a
the drum and the ?oating sheave 38is alternately sh0rt—
pair of spaced pivotal arm members 60 (only one‘ of
ened and lengthened with a correspond-inglengtheningand .
which is shown in FIG. 10). The arm members 60 are
pivotally secured at 62 to any well known support struc 70 shortening of the cable segment-Y between the ?xedi
sheave 26 and the ?oating sheave 3'8. This-maintains the
ture (not shown) whereby the entire apparatus 24 may
over-all length of the‘ cable
between the ?xedv sheave A
oscillate freely therearound in a vertical plane. This
26 and the drum l?'substantially constantlatall times,
and as a result, the cable l2-movingtfromior'tothe drum
in a downward direction, as indicated in dotted lines in
FIG. 10, in response‘to the pressure or tension‘diiferen 75 10 from the ‘sheave 38‘ remains substantially perpendicu
permits the ?eet angle compensator apparatus 24 to move‘
8,083,932
8
l
lar to the longitudinal axis of the drum, thus eliminating
the fleet angle, and the inherent disadvantages thereof.
The friction contact of the cable being wound on the
excessive or detrimental to the efficiency of the winding
drum exerts a pressure through the cable which is trans
invention provides a novel reeving apparatus for com
mitted to one side of the sheave 38, thus causing the
pensating for and correcting the ?eet angle in the spooling
operation.
From the foregoing, it will be apparent that the present
sheave 38 to move in the direction in which the pressure
or unspooling of a line from a winch or drum for effect
is exerted. Since the sheave 38 is transversely movable
ing an e?icient winding of the line onto the drum without
on the shaft 28, the sheave will follow the pressure, and
move along the shaft 28 in accordance with the winding
ing apparatus is automatically shifted or oscillated by the
any distortion or entanglement thereof. The novel reev
of the cable on the drum, or unwinding thereof, as de 10 pressure of the cable or line being spooled for maintain
sired. Therefore, if the cable 12 moves in a left hand
ing the line substantially perpendicular to the axis of the
direction, as viewed in FIG. 4, toward the drum ?ange
drum throughout the spooling operation. The eccentric
16, the sheave 38 will move along the shaft 28 in a left
hand direction due to the pressure of the cable acting
shaft may be so designed and constructed to automatically
provide for the optimum oscillation or rocking move
against the ?ange portion 80 of the sheave. This move 15 ment thereof in accordance with the installation of the
ment of the sheave .38 rocks the shaft 28 in a direction for
hoisting equipment. The novel ?eet angle compensator
moving the throw 30 toward the drum 1%, thereby short
apparatus is simple and e?icient in operation and eco
ening the cable segment X and simultaneously lengthening
nomical and durable in construction.
the cable segment Y.
Changes may be made in the combination and arrange
Similarly, when the cable is moving in a right hand di 20 ment of parts as heretofore set forth in the speci?cation
rection, or toward the drum ?ange 18, as shown in FIG.
and shown in the drawings, it being understood that any
6, the pressure of the cable acting against the ?ange por
modi?cation in the precise embodiment of the invention
tion 82 of the sheave 38 moves the sheave 38 in a right
may be made within the scope of the following claims
hand direction for rocking the shaft 28 in a direction for
without departing from the spirit of the invention.
moving the throw 32 toward the drum it). It will be ap
We claim:
parent that the rocking motion of the shaft 23 is con
1. In combination with a drum having a cable wound
tinual as the sheave 38 moves laterally or longitudinally
thereon, a ?eet angle compensator apparatus comprising
therealong, thus constantly compensating for and cor
a shaft, a movable sheave journalled on the shaft for re
recting the ?eet angle and maintaining the cable substan
ceiving the cable, means carried by the shaft to provide
tially perpendicular to the axis of the drum at all times 30 for rotation thereof about an axis which is non-coplanar
during the spooling operation.
with respect to the normal axis of the shaft, said sheave
As shown in FIGS. 7, 8 and 9, the pull or pressure of
slidably secured to the shaft and movable thercalong in
the cable, as indicated by the arrow H, or the resultant
response to pressure of the cable for oscillation of the
force on the sheave 33 always passes through the center
shaft about the axis of rotation for maintaining the cable
line of rotation B, and the forces on the shaft are always 35 substantially perpendicular with respect to the axis of the
balanced. Referring to the free body force diagram de
drum.
picted in FIG. 16, the force in arm 39 plus the force in
2. In combination with a drum having a cable wound
arm 32 is equal to the force H. This is shown by the
thereon, a ?eet angle compensator apparatus comprising
formula:
40 a shaft, off-set trunnion means carried by the shaft to
provide an axis of rotation therefor which is non~coplanar
with respect to the longitudinal axis of said shaft, a sheave
The summation of moments about the center line of ro
journalled on the shaft for receiving the cable and slidably
tation B will always be equal to zero, as shown by the
secured thereon for movement therealong in response to
formula:
the pressure of the cable for oscillating the shaft about
Fao(X)‘=Fsz(Y)
the axis of rotation, said oscillation of said shaft co
By revising the above, it can be found that the force in
operating with said movement of said sheave along the
arm 3% is in the ratio to the force in arm 32 as the dis
tance X is to the distance Y, as follows:
shaft to provide an arcuate path of movement for the
center line of the sheave for maintaining the cable sub
stantially perpendicular to the axis of the drum.
3. A ?eet angle compensator for a cable drum spooling
apparatus and comprising a shaft, a pair of arm mem
Therefore, the shaft 28 may be so designed that the proper
distance, T minus S (see FIGS. 4 and 5) is provided in
accordance with the desired installation. Then, the shaft
bers disposed at each end of the shaft, trunnion means
carried by the arm members, means supporting the trun
28 will rotate a proportional amount and at all times will
keep the sheave 38 at a position that will maintain a
tation, said common axis of rotation being disposed in
a non-coplanar relation with respect to the axis of the
nions for rotation thereof about a common axis of ro
shaft to provide an eccentric movement of the shaft
constant length for the cable between the ?xed sheave 26
upon rotation thereof, a sheave journalled on the shaft
and the drum 10.
By way of summary, the ?eet angle correction appa 60 and slidably secured thereon for movement therealong,
said sheave interposed between the drum and a ?xed
ratus 24 automatically compensates for and corrects the
?eet angle of the cable coming from the ‘?xed position
position sheave having the cable extending therebetween,
said ?rst mentioned sheave movable along the shaft in
pendicular relationship with regard to the axis of the drum
response to pressure of the cable for rocking the shaft
it} during the spooling or unspooling operation. The 65 to provide an arcuate path of motion for the center
pressure of the cable passing under the ?oating sheave 38
line of the movable sheave whereby the cable is main
automatically causes an oscillating or rocking movement
tained substantially perpendicular to the axis of the drum.
sheave 26 and maintains the cable in a substantially per
of the shaft 28 simultaneously with a transverse move
4. In combination with a drum having a cable wound
ment of the sheave 3S therealong for maintaining a con
thereon, a ?eet angle compensating apparatus compris
stant length for the cable between the ?xed sheave and 70 ing a shaft, a movable sheave journalled on the shaft
the drum. Thus, the true and even spooling of the cable
onto the drum by means of a counterbalanced spooling
system, such as disclosed in the prior Franklin L. Le Bus,
Sr., patents, can be greatly facilitated and improved in
hoisting or spooling operations wherein the ?eet angle is
for receiving the cable therearound, means to provide
an off-set axis of rotation for the shaft which is non
coplanar with respect to the longitudinal axis of said
shaft, said sheave slidably secured to the shaft for move
ment therealong in response to the pressure of the cable
31,083,932
10
to the axis of the drum.
5. In combination with a drum having a cable wound
of rotation for said shaft which is non-coplanar with re
spect to the longitudinal axis of the shaft itself.
8. In a ?eet angle compensator apparatus for cable
spooling, a spooling drum, a first sheave mounted for
rotation at a position ?xed with respect to said drum,
thereon, a ?eet angle compensating apparatus compris
a shaft, a second sheave journalled on said shaft, means
for oscillating the shaft in an eccentric movement Where
by the center line of the sheave moves in an arcuate path
for maintaining the cable substantially perpendicular
carried by said shaft to provide for rotation thereof about
an axis which is non-coplanar with respect to the longi
tudinal axis of said shaft, a cable passing from said ?rst
which is non-coplanar with respect to the longitudinal 10 sheave and being wound on said drum, said cable engag
ing said second sheave at a position intermediate said ?rst
axis of said shaft, said sheave slidably secured to the
sheave and said drum, said second sheave being slidably
shaft for movement therealong in response to the pres
secured to said shaft and movable therealong in response
sure of the cable for oscillating the shaft in an eccen
to pressure of the cable to provide an arcuate path of
tric movement whereby the center line of the sheave
moves in an arcuate path for maintaining the cable sub 15 movement for said second sheave for maintaining a sub
ing a shaft, a movable sheave journalled on the shaft
for receiving the cable therearound, means carried by
the shaft to provide an off-set axis of rotation therefor
stantially perpendicular to the axis of the drum.
stantially constant length for the portion of said cable
extending from said ?rst sheave to said drum.
spooling, a shaft comprising a central portion, arm mem
References Cited in the tile of this patent
bers disposed at the opposed ends of the central por
UNITED STATES PATENTS
tion and extending angularly therefrom and angularly 20
disposed with respect to each other, trunnion means car
2,228,346
Downie ______________ -Jan. 14, 1941
ried by the arm members to provide an axis of rotation
2,249,117
Crandall ____________ __ July 15, 1941
for the shaft, said axis of rotation being disposed in a
2,372,232
Thornburg __________ __ Mar. 27, 1945
6. In a ?eet angle compensator apparatus for cable
non-coplanar relation with respect to the longitudinal
axis of said central portion of said shaft.
25
7. A ?eet angle compensator apparatus for line spool
2,595,584
2,855,163
2,922,599
Jones ________________ __ May 6, 1952
Powers ______________ __ Oct. 7, 1958
Bigelow ______________ __ Ian. 26, 1960
686,105
Germany ______________ .._ Jan. 3, 1940
ing comprising a shaft, a sheave journalled on the shaft
FOREIGN PATENTS
and slidably secured thereto for movement therealong,
and means carried by said shaft and providing an axis
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