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Патент USA US2406889

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Sept.,3, 1946.>
ì V
G. A; MITCHELL
2,406,889
POWER UNIT FOR TRÃVELING CRANES
’
Filed nec. 14; 1942
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Patented Sept. 3, 1946
2,406,889
UNITED STATES PATENT OFFICE
2,4o`sfss9 `
POWER UNrr Fon TRAVELING cRANEs
George A. Mitchell, Muskegon, Mich., assignor to
Manning, Maxwell & Moore, Inc., Muskegon,
Mich., a corporation of New Jersey
Application December 14, 1942, Serial No. 469,017
8 Claims. (Cl. 10S-163)
1
The invention relates to driving mechanism for
traveling bridge cranes or the like and more par
ticularly to a power unit adapted for converting
existing manually driven cranes for power oper
ation.
One object of the invention is to provide novel
means for mounting the power unit to the crane
Z
tive trucks.
Rotation is imparted to the drive
shaft by means -of an endless chain running over
a chain pocket wheel I4 ñxed on the shaft. The
chain, of course, depends belows the crane struc
ture to permit convenient hand manipulation by
an operator standing on the floor.
The power unit comprising the present inven
structure so that the shock and‘jar incident to
tion is particularly adapted for converting man
the starting of the motor is effectually absorbed
ually driven traveling bridge cranes of the type
thus insuring smooth, shockless acceleration of 10 above discussed for power operation. In its
the crane.
`
preferred form, the unit comprises a rigid frame
Another object is to provide a power unit for
structure adapted to be suspended from the trav
traveling bridge cranes and the like which is
erse drive shaft II and having driving means
simple and compact in construction, inexpensive
such as a chain pocket sheave 2| drivingly con
to manufacture, and which can be easily and con 15 nected as by a chain 22 with the hand chain wheel
veniently installed in existing hand operated
I4 on the traverse shaft. A reversible motor M
cranes to convert them for poweroperation.
comprising an element of the unit isarranged to`
Other objects ’and advantages l of 4the inven
drive the sheave 2I in any suitable manner.` '
tion will become apparent from the following de
The motor` M‘and other elements of the unit
tailed description of the 'preferred embodiment
are supported in a compact assembly on the
illustrated in the accompanying ‘drawing’ in
frame which is constructed to provide suitable
which:
housings for the moving partsand for the elec
Figure 1 is a perspective view of a traveling4
trical equipment associated with `the motor. As
bridge crane equipped with a power unit embody-A
herein shown a gear housing 24 is formed by a
ing the features of the invention.
25 vertical frame member 25 (Figs. 2 and 3) of
Fig. 2 is a fragmentary end‘elevational vie
generally oval contour having an integral ñange
of the power unit.
"
`
Fig. 3'is a vertical sectional vie'w of the unit
26 extending around one side to define a rela
tively shallow vertically disposed gear compart
taken substantially on the line 3----3 of Fig. 2.
ment 21. This compartment is adapted to be
Referring to the drawing, the invention has 304 closed by acover 28 bolted or otherwise rigidly
been shown for purposes of illustration as ap
secured to the ñanged member.
plied to a traveling bridge crane having a bridge
Projecting laterally from the frame member
member in the form of an I-beam 5 supported
25 on the side opposite the flange 26 and prefer
at opposite ends by end trucks 6. Each end
ably substantially at right angles to the plane
truck comprises an elongated frame 1 disposed
of the member is a rigid horizontal frame mem
transversely of the bridge member and clamped
ber or arm 2S terminating at its outer end in
or otherwise rigidly attached to the bottom flange
a box~like housing structure 30. A control relay
thereof. Flanged Wheels 8 and 9 journaled on
:Ror other control mechanism for. governing the
trucks on opposite sides of the bridge member
operation of the motor M may be mounted in the
support the crane assembly on an overhead track 40 housing 30. It will be understood, of course, that
formed by conventional rails IIJ.
.
` 'the'control of the motor is effected through the
Cranes of the above general character, as well
medium of a pendant switch (not shown) or other
as other types of cranes, hoists and various mate
manuallyoperable circuit controlling device con
rial handling devices, are commonly equipped
veniently accessible to the operator of the crane,
with manually operable means for'traversing the 45 . such manual device acting through the medium
crane structure or device on thesupporting track.
` of the relay R to open and close the current
In the exemplary bridge crane, this means com
supply circuit for the motor.
prises a horizontally disposed traverse drive shaft
As will `be seen by reference to- Fig.Y 3 of the
I I extending generally parallel to the bridge mem
drawing, the housing 36 is formed with an end
ber 5 and journaled at opposite ends on the 50, wall portion 3|.substantial1y para1le1 to the frame
trucks 6. The shaft is drivingly connected with
"member 25 and spaced therefrom to provide clear
one wheel of each truck, as for example, the
ance for the sheave 2|.V A boss 32 integral with
wheel 8, by means of pinions I2 fast on the
the wall portion 3l is recessed to receive a bear
shaft and arranged to meshwith gears I3 rigid
ing 33 in which is journaled one end of a shaft
with the corresponding wheels 8¿of therespec
¿34 adapted to support the sheave 2| and to which
3
4
the sheave is keyed. The other end of the shaft
34 is arranged to project into the housing 24
ated with the yoke and the other with the cap
member. The parts can thus be separated for
convenient application to the traverse drive shaft
through an aperture in a boss 35 on the mem
Without requiring any dismantling of the crane
ber 25 and is supported therein by a suitable
bearing 3%. The housing 38 is dimensioned so 5 structure.
In order to make the unit universally applicable
that its top wall lies substantially in the same
to the different sizes and types of cranes and
plane as the top of the housing 24 While its bot
comparable chain drivenl devices,v the hangers 50
tom Wall is located in a plane approximately
and their bearing members 53 are separably as
through the center of the housing 24. Space
is thus provided below the housing 30 for the 10, sembled. More particularly, the half bushings
forming the bearing members are loosely mount
motor M Which is preferably mounted directly
ed,in.the„recesses in yoke and cap member and
on the fra-me member 25 with its .shaft ,MLproject-v
ing into the housing 24. Suitable’packingisiprof
are adapted toberetained in place after as
semblyby fiangesv53’ on the ends of the bush
vided around the motor shaftandïthe shaft134`l:
to prevent leakage of oil or other lubricant around 115,A ings., Inpracticaan assortment of interchange
able bearing members, all having the same out
these parts.
sidedimensionsI but varying in their internal
The means for drivingly connecting- the-moton»
dimensions to cooperate with shafts of different
M with the sheave carrying shaft 34 is. enclosed
in the housing 24.
diameters will be kept in stock so that a bearing
This means as herein shown
comprises speed reduction gearing ywhich may be
designed».` to give> any desiredrotative spreed‘to'
20 of the proper size may be selected for any* par
theusheave 2|. The gearing as herein- shown in
cludes av pinion 4l keyed tto the motor shaftî 4û~
ticularv installation'-`
The chain 22 running‘over the sheave^2llandí
hand > chain wheel ‘ l kprovides; a` driving,A connec:
and- arranged toA drivey an idler gear 4l2’carriedf
tion whereby the torque of motor M may be transf
ona shaft ßlß'journaled'at'oppositeends-on the 25 mitted to the shaft Il.v With the ,unit thus sup
ported on the traverse-drive. shaft, the torque ap
frame member zäi'andgthe cover-_ 28:“ Idler gear
plied‘to the Wheel I4 Will'tendjto Vswing the .unit
Erin-turn4 drives a gear M'keyed tothe inner
around the shaft. Due to the mounting, of _the
end ofthe shaft» Bâtonrwhich the` sheave 2l"is_
motor MJ and other heavy parts of theunit a;
mounted;
Thel vertical " arrangement of. thje ì housing-`Á 2i" 30' substantial distance below the axis of the shaft),
the Weight of the unit isvdistributedlin a manner
together ,with its shape conformingy Y generally to _
such as to oppose suchrotation.„
the progressively’ increasing diameters of` the
Means is alsoprovided 'for yieldably,resisting>
pinions „and `gears of >the reduction, gear> traingis Y
and'the’motor Mjat onerside of tlírehousingiM~-
bodilyrotation ofî‘the unitïrelative to.tli'e„sup¢_.
porting shaft an'dgfor absorbingïthesh‘ock and,”~
jar incident to; the„starting,_„ofr_the.motort so.as„
to insure smooth; 4shackles.; acceleration Aof,.-the
andorre; above the__other,_ providesra, @very com
pact'well' Ñbalanced -`structure whichv can _be `sup
ployed‘for this purpose, asherein. shownicom- »
portedin suspended ‘relatio'ngfrom then drive shaft’
prises a rigidban ôûliavingopposite endfportions.vv
II^Without,'interferingqwith’the normal ’Yus?emof ~
oiîset with respect to each other but substantially
the crane` andrwithout, imposing excessive strain
parallel. Onevrendof, the bar iss/,secured :toaster
advantageous inV reducing> both“ theVV sizel and,`
weight of-'the- frameçstructure toga _minimurm
Moreevelî; _the z arranaementnffthe, housing 30'
on the shaft.
Any, suitable means` may*< be_utilized"for,sup-Y
porting the unitjon theÄ shaftdl in _a manner,
sueh~ thatthev shafts-‘is free> tojvturnnrelative Ato`
the unit; As herein shown, the ~supporting _means
comprisesfa pair of hangers 53“ anchored to the'>
frame andyspaced apartv so» as to straddle: thel '
handrhain Wheel I e as -shovvnrin Fig; 3: Each~ f
hanger preferably comprises-a yoke`5l havinga
cap »member '52 A'detachably secured to; its " ,upper
endi- The«yoke and -cap -memberare _formed With4
complementary recesses _adapted «to ' hold À‘a’ gen-_
crane or device isolbernoveœ.v The.,means„e1n--
tionary .part <of , _thecrane structure, as ¿fora- ex- .
ample, the bridgememberz. or-rI-beamß: vv-hileathay
other end is yieldably‘ranchored,tothe framefoftth‘e
unit. Due to the offset relation .ofethesend- por-‘f
tions, the bar , mayl ,bel freadilyï.adjusted.rV for ¿use
with beams;y orwgirderst oi .various @depths-byyturna'
ingy it ,through an „, angle sufficient;r to -zprovideithe
necessaryfvertical ,- spacing,;betWeen--fthefend rpolînf
tions,.„
While:- anygsuitabletmeans mayzbeiutilízeaifom
securing v_the bar in -`place,»\it_-_ís preferable .tovclamppy
erally?cylinclrical bearingmember 5-3 *dimensionedj' 55 the-.parto the,bridgelmemberfsd‘asetdavoiddrills»
íneeor- Otherfmachíne, nperationsfongthelmembery:
for -a rotating ?it- »with Atheeshafi'fl I .'
The -yokesV El of the hangers are‘secured ,to the
frame-by» hangerl rods-54j threaded into bosses
formedrespectively in the top~vvalls of Ithe‘h‘ous
ings -ZlthandßD-Lof» the frame. To‘- enable the unit
to be properly positioned for/use Withhand chain
Wheels of different diameters, the~yokesv ared
aruerturedtol slidably receivetherods and 'the
latterareclampedin place by nuts 55' threaded
thereonlin opposed relation.h Thus the ;elîective 65
lengths vof the hanger rods‘maylvbe varied lto reg
ulate the spacing'of the sheave 2|-- withl respect
tothe hand chainwheel as required for any par
Thefßlampìllglmeansa asiherein sl’invyn,«ecornprisesrf>
a pair-of QDlQQSed Clamping; devices :eachlincluding‘h
a base,.,plate 6L having aitransversecentrallyfdis'-i ~
posed sleeveip ortiorr Gbadaptedato'slidahin-receive 1'
the bar SG. Adjustably securedfto `the~base plate;
asby bolts-_53,12 is .ai clam-ping plate 164:' havingJ its
innerVK lowercedgegrecessed :to `extend-over<.and - co'-L
operatewith',the-l ñange ‘ofthe»I-lloe'eamßä-«as-shown’L
the `clamping,'.means- may-belappliedstotthempper '~
flangeuofgthe .beam if Ídesired#
The ~» clampingg devices» may _ be~variably` jposi'#
tioned> . and" locked ‘in «place'ion-cooperatiom with`
ticular installation;
To~enable the power. unit to be installed on-an 70 I-beam~-ñanges of different Widths:N Su‘eh‘jposiá*
existing hand _operated crane Without requiring
tioning Aand -locking- ~is~ effected#by~means~ of vnuts ^
65 #threaded-_on jthe" bar~~6€|LJ and-positioned, to,l
engage-opposite ends‘ of"the^sle'eve‘62. With the'.
Cranathebearing members 53, are preferably of
clamping devices properlyjpositioned th‘e clamp?
thefsectional type. vAs herein shown, these mem
bers'are in theform-of half bushings, one associ 75’ing plates maybe forced into'clamping engage-A
disassembly» of the traverse drive shaftfrom the
„2,406,889
,ment with the lflange of the beam by tightening y
the bolts 63.
.
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,
_,
,»
'» The other end of the anchoring bar ,65 is
like Vof the `type having a traverse drive shaft,
`said unit comprising, in combination, aframe
the unit so as to permit limited rotation of the
including» a housing having a side Wall, a frame
member rigid with said wall and `projecting
therefrom substantially at right `angles to the
-unit relative to'theshaft in either direction. In
the exemplary form disclosed thebar projects
ing in a second housing having an end wall dis
ladapted to be yieldably connected to the frame of
through an aperture in a lug 66 integral with the
cover plate 28 and projecting laterally therefrom.
The yieldable connection between the bar "and _the
lug is provided by a pair of coiled compression
springs 61 and 68 encircling the bar and inter
posed between the lug and stationary members
fixed to the bar on opposite sides of the lug. ThuS,
spring 61 bears against a collar or washer BQ
mounted on the bar and held against endwisc
movement thereon by a` pin 10. Thespring 6B
plane of the wall, said frame member terminat
posed substantially parallel to the side wall of
saidçlirst housing, axially alined bearings in said
walls,` a shaft supported in said bearings, a
sheave fixed to the shaft intermediate the bear
ings, a motor secured to the sidewall of said iirst `
housing below said 4frame member, speed reduc.
tiongearing enclosed within said first housing
drivingly connecting said motor with said shaft,
means for supporting said frame on the traverse
drive shaft of the crane, and means for drivingly
bears against a similar collar or washer 1l on
connecting 'said sheave with the traverse drive
the other end ofthe rod which is held against
shaft.
‘1
‘3. A power unit for a traveling crane or the
like having a, horizontally disposed traverse
movement by a nut 12.
When the motor M is started to run in either
direction the torque applied to the Wheel I4 tends
to rotate the unit as a whole, thus compressing
one or the other of the springs tl and 6B.
The
>drive shaft, said unit comprising, in combina
tion, a `frame structure including members de
fining a pair of housings, a horizontal member
resistance to such compression increases progres- ‘
rigidly connecting said housings, a shaft jour
sively so that the motor torque is applied grad
ually to the shaftV Il to accelerate the ~crane
smoothly and with complete absence of shock.
naled in the respective housings, a sheave‘ñxed
to said shaft intermediate the housings, a motor
carried on one ofY said housings, speed reduction
The use of rheostats or comparable speed con
gearing enclosed in said onehousing drivingly'
trollers is thus unnecessary and smooth starting 30 connecting said motor with the sheave carrying
ofthe crane is insured at all times. Moreover,
shaft, control> means enclosed in the other of
the motor M may be of a relatively inexpensive
said housings for controlling the operation of
single speed type which materially reduces the
said motor, a hanger anchored to each of said
cost of the unit.
'
It will be apparent from the foregoing that the
invention provides a power unit of novel and
advantageous construction by which a wide
variety of manually operated traveling bridge
` housings, said hangers having bearing elements
engageable with the drive shaft of the crane to
support the frame structure, and means driv
ingly connecting said sheave with the drive shaft.
4. A power'unit for a traveling crane or the
cranes and comparable chain driven devicesmay
like having a horizontally disposed traverse drive
be readily converted for power operation. The 40 shaft, said unit comprising, in combination, a
unit is simple and compact and interferes in
frame structure including members defining a
no way with the normal operation of the crane.
pair of housings, a horizontal member rigidly
By reason of the novel mounting of the unit and
connecting said housings, a shaft journaled in
the means provided for absorbing the shock and
the respective housings, a sheave fixed to said
jar incident to the starting of the driving motor,
shaft intermediate the housings, a motor carried'
smooth, shockless acceleration of the crane is
on one of said housings, speed reduction gearing
obtained even though a simple, inexpensive single `
enclosed in said one housing drivingly connect
speed motor is employed and complicated expen
ing said motor with the sheave carrying shaft,
sive starting equipment such as rheostats and the
control means enclosed in the other of said hous
like are dispensed with. Thus, the unit is rela
tively inexpensive and yet capable of efficient
operation in driving bridge cranes and the like.
ings for controlling the operation of said motor,
a hanger anchored to each of said housings, said
Due to the simple 'manner in which the unit is
applied, it may be installed on existing cranes by
with the drive shaft of the crane to support the
frame structure thereon, and a ñexible member
hangers having bearing elements engageable
relatively unskilled labor and withoutY requiring 55 drivingly connecting said sheave with the drive
any modifications or changes in the crane struc
shaft, said hangers being adjustable to regulate
ture and, in fact,V without drilling or other
the tension of said flexible member.
machine operations.
Y
5. A power unit for a traveling crane or the
I claim as my invention:
like having a horizontally disposed transverse
l. A power unit for a traveling bridge crane 60 drive shaft, said u-nit comprising, in combina
or the like having a horizontally disposed trans
ation, a vertically disposed frame member, a
verse drive shaft with a hand chain wheel fast
iiange around the edge of said member project
thereon, said unit comprising a rigid frame
>ing from one side thereof to deñne a relatively
structure, hangers anchored to said frame struc
shallow housing, a horizontally disposed frame
ture in spaced relation each including a bearing 65 member projecting from the other side of said
element engageable with the drive shaft on op
posite sides of the chain Wheel and operative -to
vertical member, means forming a second hous
connecting said sheave with said wheel, a motor
secured to said frame structure, and means driv
ingly connecting said motor with the shaft
the housings, a motor secured to said vertical
frame member below said horizontal frame mem
ber, speed reduction gearing in said iirst men
ing integral with said horizontal member, said
` Wsupport the unit on the shaft, a shaft journaled
second housing being spaced laterally of said
on said frame structure, a sheave fast on said
first housing, a shaft journaled on said housings
last mentioned shaft, an endless driving chain 70 and having a sheave ñxed thereon intermediate
carrying said sheave.
'
tioned housing drivingly connecting said motor
2. A power unit for a traveling crane or the. 75 with the sheave carrying shaft, motor control
2,406,889
ling means in'said second housing, .meansat
tached tosaid housings-’for supporting the frame
structure on'the traverse shaft »of 'thecranef and
meaHsdriVingIy connecting said sheave withv the
traverse shaft.
»
6. A power unit `for la traveling crane or-the
like «having a horizontally ydisposed drive shaft,
said unit comprising, -in `combination, va frame
structure including V-a pai-r ïof laterally -spaced
frame members, a horizontal member rigidly
connecting said frame members, ashaft, -a sheave
fixed to said shaft, bearings Acarried by/saidv frame
members positioned to support said »shaft on
opposite sides of said sheave, a Amotor'mounted
on one of said framemembers, speed reduction
gearing connecting said motor-with said shaft,
posite ends in said members and adapted to be
drivingly connected with the traverse shaft, `a
motor supported on one of said members, speed
reduction gearing carried by one of said mem
bers for connecting said motor with said drive
shaft, and means rigid with said frame struc
ture for supporting it in suspended relationL to
said traverse shaft, said supporting means being
adjustable to vary the spacing of said .drive shaft
10 from the traverse shaft.
8. The combination with a power unit adapted
to be mounted in suspended relation from the
traverse drive shaft of a traveling crane having
a ñanged bridge member, of a torque arm con
necting between said unit and the bridge mem
ber comprising a generally crank-shaped bar in
means cooperating with said one frame-member
cluding a pair of parallel oppositely facing end
to- form a'housing enclosing said gearing, other
bearings engageable with the drive shaft of the
crane to support said frame structure thereon,
a flexible member drivingiy connecting said
sheave with the drive shaft -of thecrane, and
means connecting-said Iother .bearings to the
respective frame »members for-adjustment toward
and from the members to regulate the tension
vof said flexible member.
sections and a central section angularly disposed
with respect to said end sections, means yield
'7. A power unit for atraveling crane or the
like having a- traverse drive shaft, said unit com
prising, in combination, a frame structure in
cluding a pair of laterally spaced rigidly con
nected»v members, a» drive shaft jour-naled at op
ably connecting one end section of . said arm
with said Iunit at Va point spaced substantially
from its point of suspension, and clamping means
connecting the other end section of said arm
with the flange of the bridge member, said
clamping means being adjustable longitudinally
of the bridge member and said arm being rotat
able relative to the clamping means and to said
unit so as to hold said unit in an upright posi
tion irrespective of the depth of the bridge
30 member.
GEORGE A. MITCHELL.
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