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Патент USA US2405578

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FiledMarch 27,1944
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Patented Aug. 131, 1946
Ernest W. Holmes, Chattanooga, Tenn.; S.
Bartow Strang, administrator of said Ernest W.
Holmes, deceased, assigner to Ernest Holmes
Company, Chattanooga, Tenn., a corporation of
Application March 27, 1944, Serial No. 528,314
(Cl. 212-59)
20 Claims.
The present invention reiates to improvements ’
in hoisting apparatus, and more especially to
wreckers of the type employed for handling dis
abled- automotive and other vehicles and for
other uses where hoisting, pulling, towing or
similar operations are to be performed.
One of the primary objects of the invention is
to provide novel and improved operating and
controlling mechanism for the cable winding
drums whereby the construction thereof is 10
simplified and improved and the operation
thereof is facilitated.
novelty being pointed out more particularly in
the claims at the end of this specification.
In the accompanying drawings,
Figure 1 is a side elevation of the improved
hoisting apparatus according to the present in- l
vention, the same being shown mounted on a
truck and adapted to be employed as a wrecker;
Figure 2 is a top plan View ofa portion `of the
apparatus shown in Figure 1;
Figures 3 and 3a are collectively a rear eleva
tion of the apparatus on an enlarged scale, the
booms being shown as swung from the opposite
Another object is to provide novel and im
sides of the truck;
Figure 4 is a/detail View of one of the slings
proved driving mechanism for the cable winding
drums of apparatus of this character, and partie- 15 for the upper ends of the booms:
Figure 5 is adetail view in vertical section of
ularly wreckers, of the double boom type in which
the driving- gearing for the _boom and service
each boom has a drum for the boom cable and
cables of one of the booms;
a drum for the hoisting or service cable, whereby
Figure 6 is an elevation of the gearing as
at any time under control of a single attendant 20 viewed from the right in Figure 5;
Figure 7 is a detail horizontal section taken on
and from a single power drive.
the line 1_1 in Figure 6;
Another object of the present invention is to
Figure 8 is an elevation of the transferVV or`
provide novel and improved hoisting apparatus
transmission mechanism through which the driv
which, when mounted on a wrecking truck or
other vehicle, is readily accessible' as to all of its 25 ing gearings for the booms and the service cables
are driven;
4parts for inspection or servicing.
Figure 9 is a plan View of the transfer mecha
_ Another object is to provide a novel and im
nism, with the cover thereof removed and parts
proved frame in which the mechanism of the
shown in section;
hoisting apparatus is accommodated compactly
Figure 10 is a section taken on the line lll-l0
and jwhich enables narrow hoisting drums of 30
one or more or all of the drums may be operated
f in Figure 8;
large diameter to be used, with the advantage
that fewer layers of cable requireto be wound
thereon for a cable of given length than hereto
fore, and thereby avoiding or minimizing wedging
Figure 11 is an enlarged detailelevation of the
lower portion of one side of the frame, showing
the drums for the service and boom cables;
Figure 12 is a rear elevation of the structure '
of the cable between convolutions of a lower
shown in Fig. 11, with the drum operating means;
Figure 13 is a detail section showing the swivel
ing a large number of layers of a tensioned cable
of the service sheave in the upper'end
upon a drum, the frame being so designed that
of the boom;
such narrow large diameter drums may be read
14 is a detail view showing the manner
ily removed edgewisetherefrom, should such be 40- of Figure
attaching the sling to the sheave yoke at the
come necessary for servicing or other purposes.
upper end of the boom;
layer thereof, as frequently takes place in wind
„ -Further objects of the invention are to pro
vide a novel and improved construction of driv
ing mechanism for the cable drums which facili
Figures 15 and 16 are detail sectional views
showing the mountings of the swivels for the
45 boom cable guide sheave and the boom respec
tates the manufacture thereof, minimizes stresses I
tively; and
thereon under load, enables the parts thereof to
Figure 17 is a detail horizontal section on the
be 'readily removed for servicing or other pur
line l1---|1 in Fig. 11.
poses, and which is otherwise well adapted to
Similar parts are designated by the same ref
meet al1 of the requirements of heavy-duty ap 50 erence characters in the several figures.
paratus of this type.
The hoisting apparatus, according to the pres
ATo these and other ends, the invention con
sists in certain improvements, and combinations
and arrangements of parts, all as will be here
inafter more fully described, the features of
ent invention, comprises a frame l, a pair of
swinging boomsl 2, and cable winding drums and
ydriving mechanism therefor which form a com
plete unit. As shown in Figure 1,v this unit is
adapted to be mounted on the chassis 3 of a
motor truck so that the frame of the hoisting
the yoke I9, the pivot pin I8 for the service
sheave passing through these bosses and being
removable without disturbing the support of the
apparatus extends transversely of the truck im
boom by the sling. Clamps 35 are preferably
mediately behind the driver’s cab 4, all of the
parts of the hoisting mechanism being readily CII employed to bind together the ends of the loop
adjacent to the _sheave pin I8. By this arrange
accessiblefromf the rear and sides of the frame,
ment, the load on the boom is divided between
and sustained by the ends of the sling at opposite
The frame I comprises a pair of parallel, spaced
sides of the service sheave, and the portions of
vertical columns 5 at each side, each column be
ing composed preferably of channel iron, a pair 10 the load sustained by the ends of the sling are
equalized by the sheaves 32, especially when the
of horizontal base members 6, also preferably
yoke i9 swivels in the upper end of the boom, as
composed of channel iron, to the outer sides of
takes place while the service cable is pulling a
which the lower ends of the columns 5 are riv
load from a side of the boom, thus equalizing the
eted, welded or otherwise iixed and a similar pair
tension on all of the boom supporting cables.
of horizontal members ‘I connecting the respec
The ends of the sling straddle the upper end of
tive columns 5 and similarly iixed thereto. Angle
the boom as'the latter is raised, as shown in
irons 8 extend horizontally between and connect
Figure 3a, thus avoiding interference with the
the tops and diagonal braces S connect the ends
raising of the boom to its extreme height. An
`or the upper angle irons and plates IU riveted,
Outrigger leg 4!) is preferably provided for sup
welded or Aotherwise ñxed to the lower portions
porting the load on one or the other side of the
of the columns 5. rl‘he frame is supported rigidly
frame while the boom at that side of the frame
on the truck chassis.
is swung laterally from the truck to lift a load at
The booms 2 are each pivoted on a horizontal
a side thereof». Each of these legs, as shown, com
pivot' I_I carried by a swivel I2 having a vertical
prises a pair of telescopic sections 4I and 42
stem I3 ñtted rotatably in upper and lower plates
adapted to be held adjusted to different lengths
I4 bolted, welded or otherwise ñxed to the top
by a pin 43 which may be inserted through holes
,and bottom respectively of the base members t
in the section 4I and the appropriate pair of
spanning the space between them, the booms
opposite holes 44 spaced longitudinally of the
being thus mounted to swing upwardly and down
Wardly about the horizontal pivot I I and to swing 30 section 42. The lower section Vof the leg is pro
as will hereinafter appear.
laterally about the vertical stem I3 as an axis.
The upper end of each boom is provided with a
sheave l5l over which the hoisting or service cable
I6 passes, this cable being equipped at its 'end
with a hook Il or other suitable means for en
gaging it with an automobile 'or other vehicle' or
object to be hoisted or hauled, the sheave being
journaled on a horizontal shaft I3 in a yoke’ i9
swiveled in the upper end of the boom, a cable
guide I?!a being connected to this yoke for caus
ing it to swivel in the end of theïboom when a
load isr being pulled from- either side thereof.
vided with a foot ¿I2a to bear on the ground Ywhen
the leg is extended laterally of the truck and
the section 42 lowered. The upper section of the
leg is pivoted on a horizontal pin 45 in a swivel
¿.16 and the latter is provided with a vertical stem
or journal which is rotatable in plates 23 and
25a spanning the space between and secured to
the frame members 1. The universal pivoting of
the legs 20 to the frame enables each leg to be
extended at any angle laterally from the truck,
as shown in Figure 3, to bring it beneath the
respective boom and sustain a side pull or load,
spreading of the lower end of the leg being pre
vented by a chain 41 which may be attached to
The upper end of each boom is also equipped with
means'vfor attaching a boom'cable Ythereto for
raising and lowering it. The boom cable 20 is
attached at one end by a pin 2l to a sheave car
lthe lower end of the leg and one of the base
rier 22, the latter Abeing pivoted by the horizontal
use it may be folded against a side of the truck,
members of the frame, and when the leg is not in
as shown in Figure 3a, and locked by a spring
pin 23 to a swivel 24, the'latter having a hollow
plunger 4B.
vertical stem 25 which is mounted rotatably in
The service cable extends from the boom
plates 26 which span the spaces between’and 50
sheave IS over a sheave 50 journalled in a swivel
are bolted, riveted, welded or otherwise fixed to
5I' having a 4hollow vertical stem 52 rotatably
the tops of the angle irons 8 and the upper and
mounted in a pair of the plates 2S of the frame,
loweredges of the channel irons '1. Each sheave
this cable passing through the stem 52 and wind
carrierhas a sheave 21 journaled therein, around
which the boom cable passes, the boom cable also 55 ing on a hoisting or service drum 55. The boom
passing around a pair of sheaves 28 journaled on
cable passes from one of the sheaves 28 over a. f
a pin 29 in a yoke 30.
sheave 5l and downwardly through the respec
The >present invention provides novel means
tive swivel stem 25, then around a guide sheave
for attaching the boom cable yoke 30 to the
58 and winds on a drum 59.
upper end of the boom whereby the load on the
Each service cable drum 55 is of relatively
large diameter and of relatively short axial
boom'will be distributed and sustained equally
length, thus enabling a given length of cable to
at opposite sides of the service sheave I5, and
such attaching means will avoid fouling with the
be wound thereon with a fewer number or layupper end of the boom when the latter is raised.
ers of the cable than is possible with a drum of
Such attaching means comprises a yoke 3I which 65 relatively small diameter, thus avoiding tend
is hooked by its intermediate portion in the yoke
ency of the service cable, while under load, to
30 and carries a pair of sheaves 32 which are
become wedged between convolutions of an un
journaled on a pin S3 in the'yoke 3 l. The sheaves
derlying layer, and the narrow dimension of the
'32 are connected to the upper end of the boom
drum enables it to be accommodatedl between the
by a sling composed of a suitable length of ilexi 70 upright columns 5 at the respective sides of the
_ble cable 34 the ends of which are connected to
frame. This drum 55 is mounted to rotate on or
with a shaft 5B supported in bearings 60 in the
form a loop, the intermediate portions of the loop
being passed around the respective sheaves 32
relatively fixed plates I0 and from which it is re
movable axially, and the drum 55 carries a driv
and the ends of 'the loop being passed around
groved segmental bosses 35 on the outer sides of 75 ing gear SI which meshes with a pinion 62 loOSe~
1y mounted on a driving-shaft 63 and is coupled
thereto _by splines |63 and a clutch >collar |63a
slidable thereon, the shaft 63 being journaled in
91 loosened,4 for inspection or repair of these
units or adjacent parts in the frame. As the ca
ble winding drum is mounted rotatably on the
shaft 56 and the latter is removable axially from
its bearingsdn the plates I6, this drum may be
readily removed edgewise from the adjacent side
bearings 64 supported by the plates _|0, and being
removably retained in said bearings by a plate
l 638L secured to. the end of the shaft 63 by a cap
screw 63h. A band brake 65 is preferably provid
of the frame after removal of its shaft. The
ed for controlling the slack in the service cable,
torque reaction between the casing 84 and the
this >brake extending partly around the gear 6|
worm wheel -|'| or '|8 while being driven by its
and being drawn into frictional engagement with 10 respective worm is sustained by thrust screws
it by a tension spring 66, one end of which is at
96 and 9`| which are adjustable in brackets 498
tached to the frame and the other end of which
and 99 ñxed to the rear side of the main frame,
is connected to an arm 6`| fixed to and projecting
these screws being adjusted to bear against the
radially from a shaft 68, the vlatter being mount
resective ends _of the casing 8.4, although, while
ed rotatably in the columns 5 of the frame and 15 -both worm wheels are being driven simultane
having a yoke 69 fixed thereon and connected
ously, the torque reaction upon the casing 84 in
to one end of the brake band 65, the other end
one direction will neutralize the torque reaction "
of this band being connectedfat'fïû to a suitable
thereon in the other direction, due to the oppo
part' of the frame. A loop-> '|| extends radially
site directions of rotation of the worm wheels 11
from the shaft 68 and is urged toward the por
tion of the service» cable between the drum and
the sheave 50. While theservice cable is under
tension, as while a load is'thereon or this cable
is being pulled to unwind it from the drum, it
will engage or swing the loop -|| to rotate the
shaft 68 against the action of the spring 66 and
drum,.but as soon as the service cable becomes
of duplicate halves 84a and 84h united by ñanges
86 which may be bolted together, as shown, this
design of the casing enabling a single pattern to
be used for both and otherwise facilitating the
manufacture thereof. The bearings83 for the
worm shafts are removable axially, thus enabling
the worm shafts and theworms thereon,l which
are of smaller diameter than the bearings, to be
30 removed axially from the casing for servicing or
slack, the loop `|| deflects the cable under the ac
tionof the spring 66 and the latter rotates the
shaft 68 in a direction to frictionally engage the -
brake band 65 with the periphery of the gear 6|,
thus avoiding over-running of the drum and
consequent disarrangement of the cable thereon,
The drum 59 for winding the boom cable is re
movably mounted, by splines 59a, on a shaft '|5
which is journaled in bearings 'I6 supported by
replacement.` The bearings- 83 are retained in
the casing by end plates 8l which are bolted or
otherwise removably secured thereon, these end
plates sustaining the end thrust of the Worms.'
In order to prevent unintentional lowering of
the boom or unwinding of the service cable, due
to tendency of the worm gearing to back off un
der a load, because of the low resistance of »the
anti-friction bearings for the worms, each of the
40 worm shafts 86 and 82 which operate the service
the relatively ñxed frame plates I9, and remov
and boom cable drums 55 and 59 respectively is
ably retained therein by a plate ‘|6a secured to
preferably provided with a friction brake which
the end of the shaft 15 by a cap screw 15a.
will prevent unwinding of the service or boom
' vThe pinion shaft 63> for driving the service ca
cable from its respective drum, but will not in
ble _drum and the shaft '|5 on which the boom 45 terfere with the normal lifting and lowering op
cable drum is splined extend rearwardly from the
erations of these cables. Each friction brake
frame and have worm wheelsv Tl and "I8 respec
comprises, in the present instance, a friction
tively keyed or otherwise removably v'fixed there
cone 90 which is keyed on the' respective worm
on for driving them in relatively opposite direc
shaft and abuts against >a shoulder 9| thereon,
tions to wind lthe cables on the respective drums
and an outer cone 92 which is movable axially
55 and 59. According tothe present invention, 50 on the worm shaft and is urged against the cone
the worm wheel '|'| meshes with a worm 19 keyed
96 by a compressed coil spring 93 which encir
or otherwise ñxed on a shaft 80, and the worm
cles the worm shaft. The periphery of the outer
vwheel 18 meshes with a worm 8| keyed or other
cone‘92 is provided with a pair of axially ex
wise fixed on a shaft 82 adjacent and parallel to
55 tending ribs 94 between which a pin’95 threaded
the shaft 80. The worm shafts 80 and'82, which
into the casing projects, this pin and the ribs
are driven in relatively opposite directions, are
.permitting axial movement of the outer cone 92
mounted in bearings 83 which sustain the radial
but preventing rotation thereof, whereby the re
and axial loads on these shafts, these bearings
action off the frictional braking torque applied
being preferably of theV annular ball bearing type 00 to the Worm shaft by the inner cone 98 will'be
and mounted removably in a casing 84 which
contains or encloses the worm wheels" and 18,
this ycasing having bearings 85 in which the
shafts 63vand '|5 carrying the worm wheels are
journaled. By so mounting the worm shafts in
the casing and providing the casing with bear 65
ings for the worm wheel shafts, the casing and
_worm shafts are supported on or suspended from
vthe worm wheel shafts independently of the
‘ The present invention provides novel and im
proved transfer orv transmission mechanism
whereby power may be applied to either service
or boom drum or to any number or all of these
drums, as may be desired. Such mechanism, as
shown in the present instance, comprises pairs
of axially alined shafts |09 and |0| journaled
in bearings |92 and |83 respectively, which are
main frame I, and by removably mounting the 70 bolted or otherwise rigidly fixed in the opposite
drum 59 on the shaft '|5 and removably mount
-ing the pinion 62 on the shaft 63,v the casing 84
together with thev worm gearing therein can be
removed as aunit after the plates 63a and 16a
The casing 84 is preferably composed of a pair
in a direction to release the brake band 65 from
the gear'äl and thus avoid a drag upon the drum
during lifting or lowering a load or while the
service cable is being pulled manually from the
side walls of a casing |04 having a removable
cover |649. ` `The outer vends of the shafts |60 are
connected by couplings |66 to the worm shafts
80 which drive the drums 55 for the service cables
have beenïremoved and the torque screws 96’ and 75 for the respective booms, and the outer ends 'of
sliding clutch members |08, |09, ||0 and ||I, re-`
spectively, whereby rotation of each shaft in one
the shafts IDI are connected by couplings |01 to
the worm shafts 82 which drive the drums 59 for
the boom cables for the respectivebooms. The
inner ends of the shafts |00 have jaw clutch
or the other direction by pulling or pushing its
respective Bowden wire .will slide the respective
sliding clutch member into or out of engage
members .|08 and |09 splined thereon to shift
ment with its companion clutch member. Means
axially »although connected to rotate therewith,
is preferably provided for yieldingly retaining
and the inner ends of the shafts |0| have similar
each sliding clutch memberv in engaged or dis
jaw clutch members |I0 and ||I splined thereon
engaged position, such means, _in the present
to shift axially although connected to rotate
therewith. A shaft ||2 is interposed between 10 instance, comprising a bowed spring |48 pivot
ally connected at one end to a hook |49 fixedin
the inner ends of the shafts |0| in axial aline
the` adjacent end of the casing |04 and pivotally
ment therewith, the ends of this shaft being re
connected at its other end to a pin |50 fixed in>
duced and journaled rotatably- in the inner ends
the respective clutch shifting fork. The spring
of theshafts |0|, and the shaft IIZ‘ has a jaw
|48 normally tends to contract or close, thereby
clutch member I i3 and a gear I I4 keyed or other
biasing ,the pin |50 on the respective clutch
wise fixed thereon, the gear I|4 having jaw
shifting fork in a direction toward the hook |49,
clutch teeth ||5 fixed thereon, the clutch mem
and the hook |49 and pin |50 are so located on
ber >| I3 and clutch teeth |I5 being companions
opposite sides of the respective clutch shifting
tothe clutch members ||0 and III respectively,
and being engageable therebtT to connect the 20 Shaft that the pin |50 will move to one or the
other side of a dead center position as the re
shaft ||2 to the respective shafts |0I. A shaft
spective shifter fork is rotated to engage or dis
|16 similar to the shaft II2 is interposed be
engage the respective sliding clutch member,
tween the inner ends of the shafts |00 in axial
each spring thus serving to yieldingly retain the
alinement therewith, and has reduced ends jour
respective sliding clutch member in engaged or
naled rotatably in the inner ends of the shafts
disengaged position.
|00, and the shaft ||6 has a jaw clutch member
I I1 and a gear I I8 keyed or otherwise fixed there
on, the gear ||8 having clutch teeth ||9 thereon,
the clutch member ||1 and the clutch teeth on
the gear ||0 being companions to the clutch b
members |00 and |09 respectively, and being en
The transfer mechanism, as shown, is so
designed that its mechanism may be readily re
moved from the casing |04 for servicing or other
purposes. The bearings |02 and |03 are bolted
or otherwise removably fitted in the opposite sides
gageable thereby to connect- the shaft I|6 to the
respective shafts |90. Power is applied to the
shaft ||2 by a shaft> |20 which is journaled in a
and their shafts, the latter are withdrawn from
the ends of the shafts ||2 and IIB, thereby re
of the casing, and by removing these bearings
or otherwise fixed in an end 35 leasing these latter ¿shafts for removal freely
through the open top of the casing |04 While
|04, the shafts ||2 and |20
the cover |04a thereof is removed. As the slid
bevel gears |22 and |23 keyed
ing clutch members are splined removably _on
to the respective shafts, and
the inner ends of the shafts |00 and |0|, they
the gears ||4 and ||8 fixed on the shafts H2
alsoare readily removableefrom the open top of
and || 6 mesh with one another whereby the
the casing. The axial thrust on the shaft ||2
shaft I I6 is driven from the shaft I I2 but in the
from the bevel gear |22 is sustained by an anti
opposite direction of rotation. The shaft |20
friction thrust bearing |55 which abuts at one
preferably receives power for rotating it in one
side against the inner end of the respective bear
or the other direction for lifting or lowering op
erations from any suitable or well known form 4.' ing |03 and at its other end against a shoulder
|50 onthe respective shaft |0I, and this shaft
of power take-olf from the usual truck engine,
contains an anti-friction thrust bearing~ |51
as, for example, from asprocket wheel |24 driven
against which the adjacent end of the shaft ||2
in one or the other direction by any usual or
_abuts whereby the am‘al thrust from the.._beve1
conventional form of reversible power take-off
from the transmission |25 of the truck, a chain f gear |22 is ktransferred from the shaft ||2 ¿to the
bearing |2| bolted
wall of the casing
being connected by
or otherwise ñxed
|26 driven fromv said sprocket wheel, and a
sprocket Wheel |21 fixed to the shaft |20.
p Thefour jaw clutches thus _provided in the
transfer` mechanism enable any one or more or
all of the shafts |00 and |0| to be driven by
power from the single power shaft |20, and
meansris provided for controlling these clutches
from a remote point, preferably the cab of the
Such controlling means, as shown in the
respective shaft |0| and from the latter through
the bearing |55 to the adjacent bearing |03. The
axial thrust of the other bevel gear |23 is sustained
by the inner end of the bearing I2I through an
anti-friction thrust bearing |58 which is inter
posed between its inner end and the gear |23. Oil
Seals |59 are provided for ‘the shafts |00 and |0|
whereby an oil bath may be maintained in the
casing |04 and leakage therefrom prevented. ’
present instance, comprises a set of Bowden 60 In some instances, it may be desirable to tie
together the upper or free ends of the booms andA
wires I3I, |32, |33 and |34, the outer tubes or
thus providexa rigid structure and the hoisting,
casings of which areheld, kas bya clamp |35,
towing, pulling orY hauling may be done conjointly
on thedtop of the casing -|04 .and the inner wires
by both booms, one 'of the booms being provided
of whichextend into the cab where they arevcon
for such purposes with an apertured lear |60
nected to levers, knobs or other appropriate con
projecting from a side thereof and the other boom
trol members within convenient reach of an at
tendant in the cab. The other ends of the wires
with a socket IISI to receive said ear when the
are operatively connected to levers |30, £31, |38
boomsY are brought together, a spring actuated
locking pink |92 being carried by the socket and
engageable in the aperture of the ear, substan
tially like the boom locking arrangement disclosed
in my prior Patent Reissue No. 14,720, granted
and |39 above the cover |04a of the casing |04,
these levers being ñxed to the upper rends of
shafts |49, '|4I, |42 and |43, respectively, jour
naled in suitable» bearings in the casing |04. The
shafts |40, I4I, |42 and |43 have forks |44,'|45,
|46 and |41, respectively, ñxed thereon, these
forks cooperating with> grooved collars on the
September 2, 1919.
The construction .and operation of the various
elements of the apparatus having beendescribed
>in detail, the general‘operation of the 'complete
either or both booms and operate 'either' or both
r>service for lifting'at the same time, in which
event, it is merely necessary> to pullgthe ap
apparatus is as follows: Normally, -or whilelthe
apparatus is in transit,- both booms are preferably
swung to the vrear of the truck and tied together
by the locking pin- |B2,ounintentional unwinding f
of the servicev or boom cables from their' drums
. '
The hoisting, towing, pulling, hauling or other
operations may be performed either whilev the
the power for these operations being .provided
by’thesingle power shaft-IML
»under the inñuence of the load being prevented
by the friction brakes 9d, 92 on the shafts of the
worms which drive the service and boom cable
drums 55 and 59.
propriate ones or all of the Bowden wires,qall; oi
In order to lower one or the> other boomor- to
lower the'service cable tov which the-load is at
tached, the power take-off from the triuck trans
10 mission is reversed or set tov drive vtheshaft'lZll
yin the opposite direction to thatforî lifting,- and
the sliding clutch member corresponding to the
booms are tied together and sustain the load
boom or service cable to be lowered' is engaged
.conjointly, or such operations may be performed
with its companion clutch member by pulling 'the
by either or both of the booms operating sepa 15 respective Bowden wire,- thereby causing power
rately, as while one boom is being employed to
to be taken from the shaft v|20 to rotate thefre
hoist, pull, haul or otherwise operate upon a load
spective worm and cooperatin'g'worm v.wheel to
sustained by one ofthe booms while swung to
rotate the corresponding boom' drum or vservice
one side of the truck while the other boom is
drum in a direction to unwind the -respective boom
swung to the other side of the truck and itsserv 20 or service cable, and, obviously,- one or more or all
'ice cable is attached to an anchor so that this
of the boom and service‘drums may vbeadriven
service cable acts as a >guy for the other boom
simultaneously, if desired» the 'power therefor
»whichsustains ‘the load.
being supplied from -the single. power `'shaft-'Hitt
_Assuming the booms have been arranged'ap
The torque reaction between the worm wheel T!
-propriately for the operation to be performed, the
or 'i8 and the casing 84 will be sustained -by the
power take-off from the transmission of> the
stops or adjustable screws 93 and Qlgwhich-abut
truck will ybe put into operation for lifting, the
against the ends of the respective casing 8d, al‘
power shaft |28 being thereby driven continu
though `y`when bothv worm wheels-'Ill _and i8 `are
ously in the appropriate direction by power taken
driven -simultaneously ¿to raise the, 4resrnective
vfrom the usual engine of the truck. In order to #30 boom and lift or pulla load on the. servicefcab-le
lift one or the -other b-oom, the Bowden 4wire |33
or |34 is pulled, thereby shifting the respective
sliding clutch member H0 or || | to couple the
shaft | l2 to the respective shaft liil, in conse
quenceof which the respective worm 8| will drive
its cooperating worm wheel 'I8 in a direction to ro
tate the boom operating drum 59 in a direction
for that boom, the torque reaction on thejcasing
B4 from one worm will be »neutralized> more or
towind the respective boom lifting cable 20 there
on, thus lifting the respective boom, and when
-,such boom reaches the »desired height, the clutch i v40
member which was engaged will -be disengaged
from its companion clutch member by pushing
less by the torque reaction from the othernworm
wheel, it being noted that the worm wheels .'|'| and
'I8 are driven in opposite> directions to windthe
cables on the drums 55 and 59, res1:xectively.¿L
Also, as the axial thrusts'of the worms '19 >and
8| are in oppositel directions- during theirgopera
tion to raise the boom and lift the service. cable,
the reactions of such aXialthrusts areï distrib.
uted between the opposite vsides of ,the casing 83,
thus enabling this casing to be constructed of r.el«
atively light weight,~ and the torque/sustaining
screws for thisy casing 'may also be lofrelatively
the respective Bowden wire |33 or |34, thus stop
ping> the boom lifting operation, and the boom
will be held in its adjusted position by the ir
reversible action of the respective worm 8| and
cooperating worm wheel 18; or when both booms
light weight.
As each casing-84 »is mounted on
the respective worm wheel shafts B3 and _15 and
may each be removed asa unit therewith as here
inbefore described, these- units and» also the rear
side of the frame in the region in«;which.the
drums 55 and 59v are located are readily made
are to be raised simultaneously, both clutch mem
bers _| l0 and || | are engaged at the same time. '
y After the boom employed for hoisting, pulling,
hauling or similar operation has been thus ad
_justed to the` desired height or angle, the ap
própriate Bowden wire |3| or |32 is pulled, there
The large diameter service drums 55 employed
not only enable a suiiicient length vof service cable
to be wound thereon in a minimum numberof
by shifting the respective, sliding clutch member
|û8 or |69 into engaged position and therebyl 55 layers, thus avoiding wedging of the cable between
the convolutions of the -layerslwound on vthe-drum
under tension of the load, ‘butI also enable` drums
_which are relatively narrower ofshort~ axial
spective worm>19 and thereby drive its cooperat
length to be employed. Such narrow'drums'may
ing worm wheel ‘l1 in a direction to rotate the
drum 55 to wind the service cable lli'thereon. 60 be accommodated in a narrow frame 'which may
be conveniently mounted transversely on a truck
coupling the -shaft || 6 to the respective shaft |00,
causing operation- of such shaft Vto drive the re
‘Since the load to be lifted or pulled is attached
.to the hook |'| on the service cable, the load will
be lifted or lpulled until the respective clutch`
`member |08 or |99 is disengaged from its com
panion clutch member by pushing the respective
Bowden wire |3| or |32, whereupon the lifting
or pulling vof the load will be stopped, and the
load will be supported by the irreversible action
>of the respective worm -'|9_ and worm wheel 11.
When both service cables are employed at the
same time for hoisting, pulling or similar oper
ations, both clutch members |08 and |09 are en
gaged at the same time by simultaneously pull
immediately behind the'cab, thus renderingr the
rear side of the frame accessible for servicing of
the mechanism therein andl leaving the rest' of
the truck body available for loading _or lother pur
poses, and the narrow service drums, as well as
the boom operating drums ‘59, may be-'readily
removed edge wise from the respective' en_dsof
the frame,l after removal of their shafts, vfor
servicing or other purposes.
' '
The employment vof wormsand worm wheels
for driving the service and boom winding drums
greatly simplifies the'apparatus- since these worms
and worm wheels’ are irreversible, thatv is, _the
ing both Bowden wires l3| and |32.
worms will hold theïworm wheels against retro,
In some instances, it may be desired tolift 75 graderotation under the loads imposed upon-‘the
service and boom winding drums, 'and will auto
matically hold the load and the boom at any~
height to which the same are lifted, thereby ob
Í‘viating the necessity of employing complicated
ratchets for -locking the drums, and releasing
companion clutchrmembers connected respec
tively to said gearings, and means individual to
said clutch members and companion clutch mem
bers for engaging and disengaging them.
8. Hoisting apparatus according to claim 6,
wherein said transfer mechanism includes means
and controlling means for unwinding the cables
for each of said clutches for yieldingly holding
from the drums, as heretofore. Also, the present
the same in engaged and disengaged conditions.
invention provides a novel transfer mechanism
9. Hoisting apparatus comprising a boom, ser
whereby the power for driving the drums to both
wind and unwind the service and boom cables 10 vice and boom operating cables cooperative there
with, drums for winding and unwinding the '-re
may be derived Vfrom a single power shaft which
spective cab1es,'worm wheels disposed in differ
¿may .be driven conveniently by the usual engine
ent but adjacent planes land connected to the re
of the truck on which the apparatus is mounted.
spective drums for operating them, a casing com
The present invention provides a heavy duty
posed of similar halves enclosing the respective
apparatus of great :power and strength for per
worm wheels, and a pair of worms journaled 'in
»forming efñcie?tly and rapidly a variety of oper
the ends of the respective casing vhalves in -acl
ations, such as lifting, pulling, hauling or towing
jacent parallel relatlon and engaging the -respec
disabled automobiles -or other vehicles or appa
tive worm wheels.
ratus, in vwhich all of the power required is sup
10. YHoisting apparatus comprising a frame, a
plied from a single source and may be controlled 20
pair of booms .mounted thereon, service and
conveniently, >as from the cab of a truck, and the
boom operating cables cooperative with the re
various parts of the apparatus are readily acces- Y
spective booms, drums mounted in the frame for
siblefor inspection, :removal or other servicing.
winding and unwinding the cables, gearing in
I claim as ~my invention:
.1. 4Hoisting apparatus comprising a frame, a 25 cluding worm wheels connected to the drums for
each boom and a pair of worms meshing respec
boom’mounted thereon, service and vboom operat
tively With the worm Wheels for the respective
ing .cables cooperative with the boom, drums -for
boom, transfer mechanism comprising a casing,
winding the respective cables, shafts mounted on
a power shaft journaled therein, a pair of driv
the frame and connected to the respectivedrums
for driving them, a worm wheel fixed to each of 30 ing shafts connected to the power shaft and pro
vided with clutch members, pairs of driven shafts
said shafts, a casing supported directly by said
journaled in the opposite sides of the casing in
shafts independently of the frame, worms
alinement with and supporting the respective
mounted in said casing and vcooperative with the
driving shafts and having >sliding clutch mem
respective worm wheels for operating them, and
bers on their inner ends to cooperate with the
means -on the frame and cooperative with said
.respective clutch members on said driven shafts,
casing for sustaining the torque reaction of said
worm wheels thereon.
2. Hoisting apparatus according to claim 1,
wherein said torque reaction sustaining means
comprises abutment members on the frame en
gaging opposite portions of said casing.
3. Hoisting apparatus according to claim 1,
wherein said torque reaction sustaining means
comprises a pair o'f alined screws mounted on
the frame and adjustable into abutting relation
with opposite portions of said casing.
4. Hoisting apparatus according to claim 1,
wherein said worm wheels rotate in relatively
opposite directions to operate the respective
drums to 4wind the cables thereon.
5. Hoisting apparatus according to claim l,
wherein said worms are mounted in parallel re
lation in said casing and rotate said worm wheels
said driven shafts being connected to the re
spective worms, clutch sluiting means in the
casing for operating said sliding clutch members,
40 and means exterio'rly of the casing and connected
to said clutch shifting means for operating the
11. Hoisting apparatus comprising a frame
adapted to be mounted transversely on a truck
» Yand having `parallel upright columns providing
openings vat 'the opposite ends of the frame and
at the respective sides of the truck, booms swiv
eled on the frame adjacent to its opposite ends,
service and boom operating cables cooperative
with each boom and extending into the respec
tive ends of the frame, 'drums> for winding said
cables movable edgewise into and out of opera
tive positions between the columns through said
openings at >the respective ends vof the frame,
in relatively opposite Adirections to wind the re
and shafts mounted in the frame for removably
spectivev cables thereon, and means for sustain
supporting the drums therein for rotation> in a
ing the thrust of said worms against the respec
common plane.
tive ends of said casing.
12. Wrecking >apparatus for mounting on a
6. Hoisting apparatus comprising a pair of
truck transversely and behind the cab thereof,
booms, service and boom operating cables for
each boom, drums for winding the respective 60 comprising a 'relatively narrow frame having
drums 'mounted in a common plane in each end
cables, gearings individual to said drums for the
thereof at the respective side of the truck for
respective booms for operating them, a power
winding a servi-ce cable and a boom operating
shaft, and transfer mechanism interposed be
cable, a boom swiveled on a vertical axis adjacent
tween said gearings and driven by said power
to each end of the frame> and cooperative with
shaft and comprising clutches for individually
said »service and boom operating cables, sets of
connecting the power shaft to the respective
gearings at a side of the frame and'adjacent
gearings for selectively operating the service and
to the respective ends thereof for operating the
boom cable drums for both booms from said
drums for the service cable and boom operating
power shaft.
7. Hoisting apparatus according to claim 6, 70 cable for the respective booms, and transfer
mechanism mounted at said side of the frame
wherein said transfer mechanism comprises a
midway between its ends and between said sets
pair of shafts, gearing connecting them to rotate
of gea-rings and connected to Said sets of gear
in relativelyreverse directions, one of said shafts
- being connected to said power shaft to be driven
thereby, clutch members on said pair of shafts,
ings for operating them.
13. In hoisting apparatus, 'a boom, a sheave
for a service cable swiveled in the end of the
boom for rotation about the longitudinal axis
of the boom as a center, a boom operating cable,
a supporting sheave having a shaft connected to
the boom operating cable, and a sling having its
ends connected to the outer` end of the boom at
opposite sides of said sheave, and having a por
tion thereof between its ends extending around
said supporting sheave connected to the boom
operating cable.
14. In hoisting apparatus, a boom having a
sheave mounting swiveled in the end thereof for
rotation about the longitudinal axis of the boom
as acenter, a service cable sheave supported by
said mounting for rotation on a substantially
horizontal axis, a boom supporting cable, a pair
of supporting sheaves having a shaft connected
to said cable, and a sling having its ends looped
for rotating said worms in relatively opposite
directions to operate the drums to wind the re
spective cables, and clutches between the power
shaft and said Worms for selectively connecting
the latter to the power shaft.
18. Hoisting apparatus comprising a frame, a
boom pivotally mounted thereon, a service cable
carried by the boom, a boom supporting cable
connected to the boom, a pair of drums mounted
in the frame adjacent to the pivotal mounting
of the boom for winding the respective cables, a
casing adjacent to the pivotal mounting of the
boom, a pair of worm wheels mounted in the
casing in overlapping relation and in adjacently
located planes, a gear connected to one of the '
worm wheels and cooperative'with one of the
drums, a shaft connected to the other of said
worm wheels and connected directly to the other
drum, said gear and shaft rotating the drums in
sides of the service cable sheave, and having its 20 the same cable winding direction by rotation of
the worm wheels in relatively opposite directions,
intermediate portions extended around said pair
a pair of worms mounted in said casing and
of supporting sheaves.
meshing with the respective worm wheels, a power
15. Hoisting apparatus comprising a boom,
shaft, and worm driving shafts having means for
service and boom operating cables cooperative
therewith, drums for winding the respective ca 9.5 connecting them to the power shaft to rotate the
worm wheels in relatively opposite directions to
bles, worm and worm wheels connected to the
wind the cables on the respective drums.
respective drums for rotating them to wind and
19. Hoisting apparatus comprising a frame, a
unwind the respective cables, power means for
pair of booms pivotally mounted at opposite ends
operating the worms, and a friction brake co
thereof, service cables carried respectively by the
operative with each worm for holding it against
booms, boom lifting cables for the respective
rotation independently of the power means, said
booms, service and boom cable operating drums
friction brake comprising inner and outer coni
mounted in the respective ends of the frame ad
cal members, one of which is fixed to turn with
jacent to the pivotal mountings of the respective
the respective Worm, and means including a pin
cooperative with the other conical member to 35 booms thereon, a pair of gearings at a side and
adjacent to the respective ends of the frame and
permit axial movement but prevent rotation
connected to the respective adjacent drums for
operating the drums, a power shaft mounted in
16. Hoisting apparatus comprising a narrow
termediately between the ends of the frame, pairs
elongated frame, a pair of booms mounted re
spectively on the ends thereof, service and booml - of shafts extending longitudinally at said side
of the frame, means for connecting the shafts of
operating cables for each boom, drums mounted
each pair respectively to the gearings for oper
in the respective ends of the frame for Winding
ating the service and boom cable drums adjacent
the respective cables, gearings adjacent to the
to the respective ends of the frame, and means
respective ends of the frame and individual to
including clutches for selectively connecting the
said drums for operating them, a power shaft
shafts of said pairs to the power shaft.
mounted between the ends of the frame, and
20. Hoisting apparatus comprising a boom,
transfer mechanism mounted adjacent to and
service and boom operating cables cooperative
driven by said power shaft and comprising
therewith, drums for winding the respective ca
clutches for individually connecting the power
shaft to the respective gearings, and means con 50 bles, worm wheels disposed in different but ad
jacent planes and connected to the respective
nected to said clutches for controlling them from
drums for rotating them to wind and unwind
a remote point.
the respective cables, worms mounted on adjacent
17. Hoisting apparatus comprising a frame, a
parallel axes and cooperating with the respective
boom pivotally mounted thereon, a service cable
carried by the boom, a boom supporting cable 55 worm wheels, power means for operating the
worms, clutches for connecting and disconnecting
connected to the boom, a pair of drums mounted
the worms and power means, and friction brakes
in said frame adjacent to the pivotal mounting
constantly acting on the respective Worms to re
of the boom for winding the respective cables,
sist rotation thereof and thereby hold them
a casing adjacent to the pivotal mounting of the
boom, a pair of worm wheels mounted in the co against rotation under the influence of the re
spective worm wheels while the worms are dis
casing and connected respectively to said drums,
and engaging the sheave mounting at opposite
a pair of worms mounted in the casing and co
operating respectively with the worm wheels, a
power shaft, means operable by the power shaft
connected from the power means.
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