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Патент USA US3059792

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Oct. 23, 1962
G. J. BAUDHUIN
MOBILE LIFT
3,059,782
Filed Sept. l0. 1959
4 Sheets-Sheet l
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Oct. 23, 1962
c;f J, BAUDHulN
'3,059,782 '
MOBILE LIFT
Filed Sept. l0, 1959
4 Sheets-Sheet 2
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OCÍ- 23, 1962
G. J. BAUDHUIN
3,059,782
MOBILE LIFT
Filed sept. 1o, 1959
4 Sheets-Sheet 3
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Oct. 23, 1962
G. J. BAUDHUIN
MOBILE LIFT
3,059,782
Filed Sept. l0, 1959
4 Sheets-Sheet 4
United States Patent Oli .Lice
1
3,059,782
Patented Oct. 23, 1'962
2
3,059,732
George J. Baudhuin, Sturgeon Bay, Wis., assignor t0
MOBILE LIFT
Drott Manufacturing Corporation, Milwaukee, Wis.,
a corporation of Wisconsin
Filed Sept. 10, 1959, Ser. No. 839,175
8 Claims. (Cl. 212-13)
This invention relates to novel and useful improvements
in mobile lift devices.
An important object of this invention is to provide an
improved gantry type mobile lift device which is adapted
for use over uneven surfaces and which will enable the
ground engaging wheels of the gantry to conform to the
surface without causing twisting of the bridge portion
of the gantry.
A more particular object of this invention is to provide
an improved gantry type lift device including spaced side
frames and a connecting bridge in which the bridge is
rigidly connected to one of the side frames and is pivot
ally attached to the other of the side frames for limited
pivotal movement about an axis parallel to the longitu
dinal axis of the bridge to permit limited relative turning
lower ends interposed between the channels and are rigidly
secured thereto.
The »side frame 11 is similarly con
structed and includes a longitudinally extending member
21 and upwardly extending members 22 and 23. The
longitudinal member 21 is also formed by opposed channel
members which are spaced apart by web plates 21a.
The bridge 12 is preferably formed by two spaced
beams 28 and 29` which arerigidly attached at one end
to one of the side frames such as side frame 10i. As best
shown in FIGS. 1 and 4, a plate 31 is secured, as by weld
ing, to the ends of the beams 28 and 29. The plate ex
tends between the beams 28 and 29 to interconnect the
same and also projects downwardly below the beams for
attachment as by fasteners 32 to the upper ends of the up
wardly extending members 19 and 20 to rigidly inter
connect the latter to each other and to the bridge. Upper
and lower plates 33 and 34 and a side plate 35 are welded
to each other and to the plate 31 and extend between the
beams 28 and 29 to form a rigid box-type structure for
interconnecting the beams. Reinforcing brackets (FIG.
4) 37 are secured to the upper ends of the side frame
members 19 and 20y »and to the bridge beams 28 and 29.
The bridge 12 is thus rigidly connected to the side
frame 10 and Iforms a rigid unit therewith. In order to
of the side frames as the gantry traverses uneven surfaces.
Another object of this invention is to provide a gantry 25
adapt the gantry~type mobile lift for use on uneven sur
type mobile lift device having a carriage mounted on the
faces, the bridge 12 is mounted on the other side framev
bridge for movement therealong and an improved travers
11 for pivotal movement with respect thereto about an
-ing and hoisting apparatus in which the traverse winch
axis extending parallel to the longitudinal axis of the
and the hoist winch `are mounted on a stationary portion
of the gantry and connected to the carriage by flexible 30 bridge. This permits the side frames 10 and 11 to turn
relative to each other about an axis extending transverse
cables in such a manner that, when the hoist winch is
to the axis of the gantry to thereby enable the ground
stationary, the carriage can be moved along the bridge
engaging »wheels to ride over uneven surfaces without
without changing the elevation of the load carried by the
twisting the bridge. For this purpose, a cross beam 40
carriage.
secured to the ends of the bridge beams 28 and 29‘ to
These, together with various ancillary objects and ad 35 is
extend therebetween. As best shown in FIGS. 4 and 5,
vanges of this invention will be more readily appreciated
the cross beam includes spaced side plates 41 and 42, a
as the same becomes better understood by reference to
bottom plate 43 and top plates 44 and 45 which are se
the following detailed description when taken in connec
cured to each other as by welding to form a box-type
tion with the accompanying drawings wherein:
FIGURE l is a perspective View of the mobile lift de 40 structure which extends between the bridge -beams 28 and
29 and rigidly interconnect the same. Plates 47 and 48
v1ce;
are rigidly secured as by fasteners 49 to opposite sides
FIG. 2 is a diagrammatic plan view illustrating the use
of the side frame members 22 and 23 to rigidly inter
of two mobile lift devices in tandem to transport long
objects;
connect the latter, which plates have upwardly extending
device;
sides of the cross :beam 40. A plate 52 (see FIGS. 4 and
5) is welded to the plates 47 and 48 and extends there~
between. The cross beam of the bridge is pivotally at
portions 47a and 48a respectively ldisposed at opposite
FIG. 3 is an end elevational view of the mobile lift 45
FIG. 4 is a fragmentary sectional view taken on the
plane 4_4 of FIG. 3 and illustrating the hoisting and
traversing apparatus;
tached to the upwardly extending portions 47a and 48a of
plane 5_5 of FIG. 3;
aligned openings in the plates 48, 41, 42 and 47. The
openings in these plates are suitably reinforced by bear
the plates by means of a pin 5‘5 which extends through
FIG. 5 is a fragmentary sectional view taken on the 50
g FIG. 6 is a fragmentary sectional view taken on the
ing plates as shown in FIGS. 4 and 5 which are welded
plane 6~-6 of FIG. 3;
FIG. 7 is a fragmentary top. plan View of the mobile
lift device;
'
tothe respective plates to increase the bearing area. Spac
55 ers 61 are interposed between the cross beam of the
FIG. 8 is a fragmentary sectional view taken on the
plane IS--S of FIG. 7; and
FIG. 9 is a diagrammatic View illustrating the control
system for the mobile lift device.
In general, the mobile lift device comprises a gantry 60
type crane having spaced side frames 10 and 11 and a
bridge and the plates 47 »and 48 of the side frame to pro
vide a yworking clearance therebetween. Conveniently, the
pin 55 may be held in position by a rigid flange 63 on one
end and a removable plate 64 which is detachably secured
to the other end of »the pin. As will be noted, the axis
of the pin is located medially between the bridge beams
2S and 29 Iat a level intermediate the upper and lower
bridge 12 extending between the upper ends of the side
edges thereof.
frames. The gantry is supported on wheels 13 and 14
Provision is made for both driving and steering the
to enable movement of the gantry, and a hoist carriage
gantry
and in theernbodiment shown, one set of wheels
65
15 is mounted for movement along the bridge 12.
designated 13 are ?ìxedly mounted on the frame while
The side frame 10 comprises a longitudinally extending
the other set of wheels 14 are mounted for steering move
frame member 18 and upwardly extending frame members
ment, it being understood that both sets of wheels may be
19 and 20. The longitudinally extending frame member
mounted for steering movement if desired. The wheels 13
18 is herein shown formed by opposed channels which
are spaced apart and interconnected by web Iplates 18a. 70 are rotatably journaled on axles carried by wheel mount
ing brackets 71 attached to the longitudinally extending
The upwardly extending members 19 and 20 have their
members 18 and 21 of the side frames. The brackets
3,059,782
n
¿è
herein shown are of generally U-shape configuration and
straddle the wheels 13. The other wheels 14 are rotatably
mounted on axles carried by wheel supporting brackets
72, which brackets are mounted for steering movement
about an upright axis. As best shown in FIG. 6, the
brackets each have an upwardly extending shaft 73 there
on which extends through openings in plates 74 and 7S on
4
`mounted on one of the side frames 10. The pumps have
inlet lines 125 and 126 connected tto a reservoir 124
and delivery lines 128 and 129. The delivery lines 128
is connected through a line 130 to the control valve 82r
of the right steering booster 77. The other discharge
line 129 is connected through a conduit 131 with the
left hand control valve 82L of the steering booster at
`the left hand yside of the lift. The respective right and
left hand control valves are otherwise connected through
return lines 132 and 133 with the reservoir 124. The
each of the longitudinally extending members 18 and 21
of the side frames. The brackets 72 are also conveniently
in the form of U-shaped yokes -which straddle the wheels 10 discharge line 128 is also connected through a line 136
14. Steering of the wheels 14 is preferably effected »by an
to a control valve 13711, which control valve is otherwise
hydraulic steering apparatus of the type disclosed and
connected through return lines 138 and 139 «to the reser
claimed in the copending application of George Baud
voir. The valve 137a has controlled outlet ports con
huin, Serial No. 823,766, filed June 29, 1959. In general
nected through lines 143 and 144 to the left drive motor
the steering apparatus includes an hydraulic steering 15 114L, and an operator 142 adapted in one position to
booster 77 such as the series S23 steering booster manu
connect the supply line 136 with the line 143, and in the
factured by Vickers Incorporated, Detroit, Michigan.
other position to connect the supply line with the line
One of these steering boosters is provided for each of
144 to thereby reversibly drive the motor. Preferably,
the yokes 72 and includes a cylinder 78 having a piston
-the valve is of the type having a neutral position in which
therein. The piston rod 79 is pivotally attached by an
it intercommunicates the lines 143 and 144 to provide
anchor ball stud 80 (FIG. 3) to a respective one of the
free wheeling. The delivery line 129 is connected
side frames. A 4-way control valve 82 is mounted on
through a conduit 148 with a `control valve 137b, which
each of the steering cylinders 77 for movement therewith
control valve is otherwise connected Ithrough a line 149
and has a control ball stud 83 which is movable relative
with the return line 139 leading to the reservoir. The
25
to the control valve from a “neutral” position to an
valve 137b has controlled outlet ports connected through
“extend” position or a “retract” position. The steering
conduits 151 and 152 to the right hand drive motor 114r
cylinders at relatively opposite sides of the mobile lift
and a control lever 153 for reversibly controlling -the ap
are connected through a bracket 84 to the respective steer
plication of pressure to the motor 1141‘. As will be noted,
ing yokes 72, at points spaced outwardly of the pivot axis
the right hand steering booster and drive motors are
of that yoke. In order to turn both wheels 14 in the same 30 operated from one pump »and the left hand steering
direction, it is necessary to extend one of the steering
booster and drive motors are operated from a separate
boosters and simultaneously retract the other steering
pump.
booster.
The traverse carriage mounted on ,the bridge 12 in
The control ball studs 82 of the steering boosters at
cludes a generally rectangular frame having parallel side
each side of the lift are operatively interconnected so as
members 155 and end members 156. Intermediate mem
to synchronize the operation of the two boosters. For
bers 157 are secured to the side members and extend
this purpose, a pair of upright steering rods 91 and 92
parallel to the end members and trolley wheels 158 are
are provided on the side frames 10 and 11 respectively.
journ‘aled between the intermediate members and the ad
The rod 91 extends generally upright and is journaled
jacent end members 156. The trolley is supported on
adjacent its lower end in a bracket 93 (see FIG. l) and
tracks 159 carried by the bridge beams 28 and 29, and
at its upper end in a bracket 94 on the side frame 10.
Stops 160 are provided at the ends `of the tracks. Cross
The steering rod 92 is similarly journaled at its lower
members 162 are secured to the intermediate members
end in a bearing bracket 95 (FIG. 5) and at its upper
157 to extend therebetween and in parallel relation to
end in brackets 96 attached to the end of the bridge 12.
the side members 155.
Upper steering arms 97 are provided on the rods 91 and
92 and a tie bar 98 extends between the upper arms and
A traverse winch 164 is mounted on bearings 165 at
one end of the bridge and driven through a reduction
is supported intermediate its ends on brackets 99 (see
gear 167 from lan hydraulic motor 168. A traverse
FIG. 1) carried by the bridge. Lower steering arms 101
pulley 169 is mounted by a bracket 170 at the other end
are provided on the lower ends of the rods 91 and 92 and
of the bridge. A cable 171 has a number of turns around
are connected by links 102 to arms 103 attached to stub 50 the traverse winch 164 and has one end thereof 171a
shafts 104. The shafts 104 are supported on the respective
attached to `the carriage, as by an adjustable eye bolt
side frames at a point spaced outwardly of the pivot axis
173. The cable extends through a guide tube 174 on
of the respective yokes and have arms 105 attached there~
the upper side of the carriage and over the pulley 169
to and connected through links 106 to the control ball
and has the other end 1711; 'attached to the carriage as
studs of the respective steering boosters. An operating 55 by an adjustable eye bolt 175. The eye bolts are ad
lever 107 (see FIG. l) is connected through a shaft 103
justed to maintain the cable 171 under tension so that,
to one of the stub shafts 104. As will be noted, oper
when the traverse winch 164 is operated, it will move
ation of the lever 107 will, through the interconnected
the carriage along the bridge in the direction determined
link-age, move the control valves of the respective boosters
by Ithe direction of rotation lof the hydraulic motor 168.
in relatively opposite directions to extend one booster 60 As diagrammatically shown in FIG. 9, this motor is
and simultaneously retract the other booster. Since the
connected through lines 177 and 178 to :the controlled
side frame 11 is pivotally attached to the bridge '12, uni
outlets of `a valve 179. Fluid is supplied to the valve as
versal joints 111 and 112 and a slip joint 113 (FIG. 3)
from the supply line 128 through a conduit 181, and the
are provided in the steering rod 92 to accommodate the
return of the valve is connected through a line 182 to
relative turning between »the side frame 11 and the bridge
the sump line 139. The valve 179 has an operator 183
12, which maintaining the driving connection between the
which will reversibly control Ithe flow of ñuid to the
traverse motor 168 and reversibly operate `the carriage.
steering boosters.
In laccordance with the present invention, the hoist
The mobile lift may be propelled in `any suitable
manner and as herein shown hydraulic drive motors 114
winch is mounted on the side frame 10 and it is con
are mounted by brackets 115 on the steering yokes 72 70 nected Ito the carriage in such a manner that movement
‘of the carriage along the bridge does not alîect the ele
and are operatively connected through a chain and
vation of the articles carried by the hoist. In particular,
sprocket drive -116 to ‘the respective wheels 114 :to drive
the hoist winch includes drums 190 and 191 which are
the same. Fluid for operating the boosters and drive
rotatably journaled in bearings 192 carried by cross arms
motors is preferably provided from a pair of pumps 121
193 on `the side frame 10. An hydraulic drive motor 194
and 122 (FIG. 9) driven as by a gasoline engine 123
5
3,059,782
is connected to a reduction gear 195 also mounted on the
cross arms 193, and which reduction gear has a drive
sprocket 196 connected ‘through a chain 19‘7 to a driven
sprocket 198 on the hoist winch shaft. A pair of spaced
idler pulleys 201 and 202 «are mounted on :a bracket 203
at one end of the bridge 12. A horizontally disposed
pulley is located at the other end of the bridge and
mounted for rotation about `an upright pin 205 on the
bracket 170. Idler pulleys 206 vare disposed adjacent
the periphery of the pulley 204 to guide the cable as it
enters and leaves the main pulley. A cable 207 has the
ends thereof attached to »the Winches 190 and 191. and
extends upwardly over the pulleys 201 `and 202 and then
6
and is steerable to enable maneuvering of the device.
When the lift traverses an uneven surface, the side
frame 10 and 11 'are adapted to turn relative to each
other about the pivot pin 55 so »that all four ground
engaging wheels may cont-act »the surface to provide ade
quate traction and to prevent twisting of the bridge 12.
This also prevents distortion of the carriage tracks 159
which are canried by the bridge beams 28 ‘and 29. Since
the traverse winch 164 land the hoist Winches 190 and
191 are mounted on the frame Iof the lift, the Winches
do not move with the carriage and it is accordingly un
necessary to provide elongated flexible conduits for con
necting the traverse winch land hoist lwinch drive motors
lengthwise of the bridge 12 and around the pulley 204
yto the respective pumps. By reason of the cable and
`at the opposite end thereof. The horizontally extending
pulley ‘arrangement employed for the hoist winch, the
runs 207a and 207b which extend lengthwise of the bridge, 15 carriage can be moved along the bridge by the traverse
are entrained over a tackle suspended from the carriage.
In »the form shown herein, the tackle includes a lirst set
of three sheaves 20Sa-208c, and ya second set of three
sheaves designated 209a-209c mounted on a shaft 211
supported in a bracket 212. The sheaves, las best shown
in FIG. 7, are mounted -for rotation Iabout an axis ex
tending crosswise of the bridge 12 and located medially
winch without changing the elevation of the pulley block
215 yand the load carried thereby.
The gantry type mobile lift may be used singly to
handle lrelatively short articles or in tandem ras shown in
FIG. 2 to handle very long articles such «as prestressed
concretel beams 245 Áand the like Iwhich must be handled
for the ends thereof. 'I‘he mobile lift is very maneuvera
between the beams 28 Áand 29 thereof. A tackle block
ble and, in conjunction with ‘the transversely movable
215 is suspended below the' carriage and includes a iirst 25 carriage 15, is Aadapted to »accurately position the load
set of two pulleys designated 21611 ‘and 216b and a second
lcarried thereby. When operated in tandem, two operators,
set of two pulleys 217:1 rand 217b. The pulleys 216
one on each lift, may be 'conveniently employed to ma
and 217 rare mounted on la common shaft 218 which
nipula-te the variols control valves on each lift. Alternative
parallels the shaft 211. The tackle box 215 is formed
ly, the `control valves 137:1 and 137b for Ithe drive motors
by a plurality of plates 219 which extend downwardly 30 114 on each of the lifts can ‘be set in its neutral position
from the shaft on which are maintained in parallel spaced
-to ,enable one mobile lift to trail the other.
relation by a bolt 220 and spacers 221. An eye plate
I claim:
222 is suspended from the bolts 220 and has an opening
1. A gantry comprising spaced side frames, an elon
223 therein for the reception of «a chain or the like by
gated overhead bridge extending between said side frames,
which the yarticles 'are attached to the pulley block. As 35 means rigidly attaching one end of said bridge to one
shown, the run 207e of the cable is entrained over the>
side frame, pivot means attaching the other end of the
carri-age pulley 208a, thence over «the block pulley 216a,
bridge to the other side frame for limited pivotal move
upwardly over the carriage pulley 208b and then over
ment relative thereto -about ‘an axis parallel to the axis
the block pulley 216b and then upwardly over the car
of the bridge, `and ground engaging wheels mounted on
liage pulley 208C. The other run 207b of the cable is 40 each of the side frames to support the gan-try, said pivot
entrained over the carriage pulley 209a, and extends
means permitting one side frame to turn 'about said axis
downwardly Iover the block pulley -217a, then upwardly
relative to the other `frame when the gantry traverses yan
over the carriage pulley 209b, zand downwardly over the
uneven surface to thereby prevent twisting of said bridge.
block pulley 217b and finally upwardly over the carriage
2. A gantry comprising spaced sidel frames, an elon
pulley 209e. The cable, as previously described, extends
from the carriage pulleys 208e` and 209C longitudinally
of the bridge 12 ‘and Iaround the pulley 204 at the end
thereof. As will be noted from FIG. 7, the idler pulleys
206 maintain the runs of the cable spaced apart a diS
tance corresponding 'to the spacing between the pulleys
208e and 209e.
gated overhead bridge extending between s-aid side frames,
-means rigidly Áattaching one end of said bridge to one
side frame, pivot means lattaching the other end of the
bridge to the other side frame for limited pivotal move
ment relative thereto about an laxis parallel to the axis
of the bridge, ground engaging Wheels mounted on each
Guides 224 may be provided on the 50 of the side frames to support the gantry, said pivot means
carriage for guiding »the runs 207a and 207b onto the
pulleys 208a and 209a respectively. With this arrange
ment, when the winch drums 190 and 191 are rot-ated
in a direction to Wind the cable 207 thereon, the pulley
block 215 and the load carried thereby will be elevated.
Conversely, when the drums `are :turned to unwind the
cable 207, the pulley block will be lowered. However,
when the hoist drums are stationary, the carriage can be
permitting one side frame to turn 'about said axis rela
tive to the other frame when the gantry traverses an un
even surface to thereby prevent twisting of said bridge, a
carriage mounted on said bridge for movement there
along, and hoist means suspended from said carriage for
elevating `and lowering articles.
3. A gantry comprising spaced side frames, an elon
gated overhead bridge extending between said side frames,
said bridge including spaced parallel beams attached at
moved Ialong the bridge without changing the elevation
of the load. As diagramm-atically shown in FIG. 9, the 60 one end to one of said frames, pivot means attaching the
hoist motor 194 is connected through conduits 231 and
other ends of said beam-s to the other side frame for
232 to »the controlled outlets of »a 4-way valve 233. 'Ille
limited pivotal movement relative thereto about an axis
inlet of the valve is connected as through »a conduit 234
parallel to said beams, and ground engaging Wheels
to the pressure outlet line 129 of one of the pumps 122,
mounted on each of said side frames to support the
and the valve is otherwise connected to the reservoir 65 gantry, said pivot means permitting one side frame to
through a «conduit 235 and return line 139. The valve
turn relative to the other side frame about said axis when
233 has an operator 236 for reversibly controlling the
the gantry traverses an uneven surface to thereby pre
vent twisting of said bridge.
ñow -of fluid to the hoist motor 194 and, preferably, the
valve is of the type which has `a neutral position and
4. The combination of claim 3 wherein said p-ivot
which it blocks flow to land form the lines 231 «and 232 70 axis is located medially between said parallel beams in
termediate the upper and lower edges thereof.
to aid locking the hoist motor against rotation.
5. The combination of claim 4 including a carriage
From the foregoing it is -thought that the operation
having spaced wheels mounted on said spaced beams` for
and construction of the device will be readily understood.
movement along said bridge, and hoist means suspended
As is apparent, the gantry type mobile lift is self-propelled 75 from
the carriage.
3,059,782
7
6. A gantry comprising ñrst and second spaced side
frames, an elongated overhead bridge extending between
said side frames, said bridge including spaced parallel
beams attached at one end to said first frame, a cross
beam extending between the other ends of said beams
and rigidly interconnecting the Same, spaced bearing
brackets on the upper end of said second side frame ex
tending upwardly on opposite sides of said cross-beam,
pivot means mounting said cross-beam on said bearing
8
said side frames, means rigidly attaching one end of said
bridge to `said ñrst side frame to form a rigid unit there
with, pivot means attaching the other end of said bridge
to said second side frame for limited pivotal movement
relative thereto about an axis parallel to the axis of said
bridge, first and Second sets of ground engaging wheels
mounted on each of the side frames to support the gantry
for movement, said pivot means permitting said first and
second side frames to turn relative to each other about
said pivot axis when the gantry traverses an uneven sur
brackets for pivotal movement about an axis extending 10 face and thereby prevent twisting of said bridge, a car
parallel to said ybeams and located between said beams
ria-ge mounted on said bridge for movement therealong,
intermediate the upper and lower edges thereof, first and
means mounted on said rigid unit Iand connected to said
second sets of wheels respectively mounted on the îower
carriage for moving said carriage along said bridge, a
ends of said first and second side frames, at least one of
pulley mounted on said bridge adjacent said other end
15
the wheels of each set being mounted for steering mover
thereof, a set of sheaves mounted on said carriage for
ment about an upright axis, steering means for turning
rotation about an axis transverse to the direction of move
said last-mentioned wheels, and means for driving at least
ment thereof, a tackle block, a hoist winch mounted on
one of the wheels of the gantry to propel the same, said
said rigid unit, and a cable attached to said hoist winch
pivot means permitting one side frame to turn relative
and entrained intermediate its ends over said pulley and
to the other side frame about the axis of said pivot means 20 over the sheaves on said carriage and said tackle block
to permit a1l of the wheels to contact the ground and to
to enable movement of the carriage along the bridge
permit all of the wheels to contact the ground and to
without changing -the elevation of said tackle block.
prevent twisting of the bridge when the gantry traverses
an uneven surface.
7, The combination of claim 6 wherein said steering 25
means includes a pair of upwardly extending steering
rods each mounted on one of »the side frames, arms on
the upper ends of the rods, and a tie rod extending be
tween said arms, said steering rod on said second frame
including a universal joint and a slip joint to accommo 30
date relative pivotal movement between said second frame
References Cited in the lile of this patent
UNITED STATES PATENTS
594,304
1,382,614
2,343,014
2,506,930
2,574,473
1897
1921
1944
1950
1951
FOREIGN PATENTS
and said first frame.
8. A gantry comprising ñrst and second spaced side
frames, an elongated overhead lbridge extending between
Wellman ____________ __ Nov. 23,
Aveling _____________ __ June 28,
Langan ______________ __ Feb. 29,
LeTourneau __________ __ May 9,
Getz ________________ __ Nov. 13,
619,042
Great Britain __________ __ Mar. 3, 1949
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